JP2005241119A - Heat exchanger breakage detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger breakage detecting device capable of accurately discriminating the breakage of a heat exchanger of a water heater, a cogeneration system and the like. <P>SOLUTION: This heat exchanger breakage detecting device 10 using a heating device 1 wherein primary circulating flow channels L1, L2 having supply means 70, 80 for supplying a heating medium on the flow channels and circulating the heating medium, and a secondary flow channel H for allowing the heating medium to flow in a high-pressure state through heat exchangers 61, 64, has a heating medium recovering part 21 for recovering the heating medium overflown from the supply means 70, 80, the heating medium recovering part 21 comprises a heating medium discharge part 23 for discharging the heating medium flowing from the supply means 70, 80 to the external with a specific flow rate as an upper limit, and an accumulation quantity detecting sensor 22 for detecting the accumulation quantity of the heating medium in the heating medium recovering part 21, and the breakage of the heat exchanger is discriminated when the accumulation quantity detecting sensor 22 detects the accumulation of the heating medium of a specific quantity or more. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchanger breakage detection device that can be suitably used for a heating device such as a hot water supply device or a cogeneration system.

  Recently, a hot water supply apparatus having a heating function added to the hot water supply function has been developed. In addition, a cogeneration system has been developed in which a power generation device is additionally provided in such a hot water supply device, and electric power is generated by the power generation device and exhaust heat generated by power generation is used by the hot water supply device.

  FIG. 6 is a flow path system diagram showing a configuration example of such a cogeneration system. A cogeneration system 100 shown in FIG. 6 is configured by adding a power generation device 102 to a hot water supply device 101, and supplies the electric power generated by the power generation device 102 to an external electric device, and also exhausts heat generated by the power generation device 102. This is a system that uses the hot water supply apparatus 101 to perform hot water supply or heating.

  The power generation apparatus 102 generates power by rotating the generator 77 with the gas engine 76, supplies the generated electromotive force to an external electric device, and exhausts heat generated by the gas engine 76 through the exhaust heat circulation passage L2. It has a function of exchanging heat with the circulating heat medium and transmitting it to the hot water supply apparatus 101 side. The exhaust heat circulation flow path L2 is formed by a circulation forward path L2a from the gas engine 76 to the exhaust heat heat exchanger 61 on the hot water supply apparatus 101 side, and a circulation return path L2b returning from the exhaust heat heat exchanger 61 to the gas engine 76. The heat medium heated by the exhaust heat of the engine 76 is circulated to the exhaust heat exchanger 61 by the circulation pump 78 to transmit the exhaust heat to the hot water supply apparatus 101 side.

The hot water supply apparatus 101 includes a heat source circulation flow path L and a heating circulation flow path L 1, and includes water supply flow paths 50, 51, 52 and hot water supply flow paths 53, 54.
The heat source circulation flow path L is a storage tank 57 that stores a heating heat exchanger 64 and hot water at both ends of a heat source flow path H formed by including a circulation pump 60, a waste heat exchanger 61, and an auxiliary combustor 62. Is a circulation flow path formed by connecting them in parallel. The heat source circulation flow path L can selectively circulate the heat medium (hot water) heated by at least one of the exhaust heat exchanger 61 and the auxiliary combustor 62 to either the heating heat exchanger 64 or the storage tank 57. It is a simple flow path.

  The water supply channels 50 and 51 are connected to the lower part of the storage tank 57, and the hot water supply channels 53 and 54 are connected to the upper part of the storage tank 57. The heating circulation flow path L1 is a circulation flow path formed by connecting a heating terminal 68 such as floor heating or a fan convector to the ends of the circulation forward path L1a and the circulation return path L1b extending from the heating heat exchanger 64.

  The hot water supply apparatus 101 can perform a storage operation for storing hot water in the storage tank 57, a hot water supply operation for supplying hot water from the hot water tap 56, and a heating operation for circulating the heat medium to the heating terminal 68. During the storage operation, the heating heat exchanger electromagnetic valve 66 on the downstream side of the heating heat exchanger 64 is closed, and the storage control valve 63 connected to the upper pipe 58 of the storage tank 57 is opened, and the heat source flow path H is opened. The storage tank 57 is connected via the upper pipe 58 and the lower pipe 59 to form the heat source circulation flow path L. Then, the gas engine 76 is activated to generate electric power, and the circulating pump 78 is driven to cause the heated heat medium to flow in the exhaust heat circulation passage L2, so that hot water flowing out from the lower pipe 59 to the heat source passage H is discharged. A storage operation in which hot water heated from the upper side of the storage tank 57 is introduced while being heated by the exhaust heat exchanger 61 is performed.

  During the hot water supply operation, the heating heat exchange solenoid valve 66 and the storage control valve 63 are closed, and normal temperature water is allowed to flow into the lower portion of the storage tank 57 from the water supply passages 50 and 51 in response to the opening of the hot water supply tap 56. Hot water stored in the storage tank 57 is discharged from the upper pipe 58 to the hot water supply passage 53. Then, the hot water in the hot water supply passage 53 and the water supplied from the water supply passage 52 are mixed by the mixing valve 55 and discharged from the hot water supply passage 54 while adjusting to the target hot water supply set temperature. When heated water is not stored in the storage tank 57, the storage control valve 63 is opened and normal temperature water supplied through the water supply channels 50 and 51 is heated from the lower pipe 59 of the storage tank 57. An operation is performed in which the hot water heated by the auxiliary combustor 62 is discharged to the hot water supply flow path 53 side by detouring to the source flow path H.

  Further, during the heating operation, the heating heat exchange electromagnetic valve 66 on the downstream side of the heating heat exchanger 64 is opened, and the storage control valve 63 connected to the upper pipe 58 of the storage tank 57 is closed, and the heat source flow path. A heating heat exchanger 64 is connected to H to form a heat source circulation flow path L. At the same time, the gas engine 76 is activated to generate power, and the circulation pump 78 is driven to circulate the heat medium in the exhaust heat circulation passage L2. Further, the circulation pump 67 is driven to circulate the heated heat medium in the heating circulation passage L1. The hot water circulating in the heat source circulation flow path L is heated by the exhaust heat exchanger 61, and the heat of the heated hot water is transmitted to the heat medium circulating in the heating circulation flow path L1 via the heating heat exchanger 64. Then, the heating medium heated to the heating terminal 68 is controlled to flow.

  By the way, in the cogeneration system 100 shown in FIG. 6, the exhaust heat heat exchanger 61 for recovering the exhaust heat generated in the power generation apparatus 102 to the hot water supply apparatus 101 side, and the heat medium circulating through the heat source circulation channel L ( Two heat exchangers of the heating heat exchanger 64 for transferring the heat of the hot water to the heat medium circulating in the heating circulation passage L1 are used.

  These heat exchangers 61 and 64 are repeatedly subjected to temperature fluctuations and pressure fluctuations by hot water and heat medium flowing through the heat source circulation flow path L, the heating circulation flow path L1 and the exhaust heat circulation flow path L2. However, in these heat exchangers 61 and 64, the partition walls are formed using a relatively thin material in order to improve the heat transfer coefficient. For this reason, when temperature fluctuations and pressure fluctuations are repeated for a long period of time, thermal stress and mechanical stress are repeatedly applied to the partition walls and are damaged, and a problem that the primary side and the secondary side communicate with each other tends to occur.

For example, in the system 100 of FIG. 6, if the internal partition of the exhaust heat exchanger 61 is damaged and the primary side and the secondary side communicate with each other, the heat medium (hot water) in the heat source circulation channel L to which the supply water pressure is applied is damaged. It flows out to the exhaust heat circulation flow path L2 side through the part. For this reason, the heat medium overflows from the replenishing means 80 provided in the exhaust heat circulation passage L2.
Moreover, when the internal partition of the heating heat exchanger 64 is damaged and the primary side and the secondary side communicate with each other, the heat medium in the heat source circulation flow path L to which the supply water pressure is applied moves toward the heating circulation flow path L1 through the damaged portion. This causes a problem that the heat medium overflows from the replenishing means 70.

  Further, in the system 100 of FIG. 6, the hot water tap 56 installed at a position at a low altitude with respect to the system 100 is opened in the water cutoff state in a state where the exhaust heat exchanger 61 and the heating heat exchanger 64 are damaged. Then, the heat source circulation flow path L side becomes a negative pressure with respect to the atmospheric pressure. For this reason, contrary to the water supply, there is a possibility that the heat medium circulating in the exhaust heat circulation flow path L2 and the heating circulation flow path L1 is mixed into the heat source circulation flow path L side. These heat media generally use an antifreeze such as ethylene glycol or propylene glycol, or a solution obtained by diluting these with water, so that these antifreezes are prevented from being mixed into hot water flowing through the heat source circulation passage L. Therefore, it is necessary to immediately detect the breakage of the heat exchanger.

Such inconveniences associated with the breakage of the heat exchangers 61 and 64 are not limited to the cogeneration system 100 shown in FIG. 6, but also occur in a single hot water supply apparatus 101 that does not include the power generation apparatus 102. Therefore, a breakage detection device for the heat exchangers 61 and 64 has been proposed.
Patent Document 1 discloses a liquid heating apparatus capable of detecting such a heat exchanger breakage. The liquid heating device disclosed in Patent Document 1 detects the flow rate of the heat medium that overflows from the replenishing means 70 and 80 due to breakage of the heat exchangers 61 and 64, and when the detected flow rate exceeds a predetermined value. This is to determine whether the heat exchanger is broken.

As another detection device, as shown in FIG. 6, the heat medium overflowing from the replenishing means is recovered by a recovery container 91, and the retention amount of the heat medium recovered in the recovery container 91 is detected by a retention amount detection sensor 92. There has also been proposed a heat exchanger breakage detection device 90 that detects and determines that the heat exchanger is broken when the detection level exceeds a predetermined value.
By adopting the detection device described in Patent Document 1 or the detection device 90 shown in FIG. 6, it is possible to immediately determine the failure of the heat exchanger and notify the abnormality, and hot water supplied for drinking. It is possible to prevent antifreeze and the like from being mixed in.
JP 2002-174458 A

  However, the detection device disclosed in Patent Document 1 and the detection device 90 shown in FIG. 6 have problems. In other words, when the cogeneration system 100 shown in FIG. 6 is laid, the heat medium is usually replenished to the replenishing means 70 and 80 excessively until the overflow level is exceeded so that the heat medium is not insufficient. Therefore, as the system is operated, the heat medium is heated and expands, and a large amount of heat medium overflows temporarily. For this reason, in the detection method disclosed in Patent Document 1, there is a problem that the heat medium overflowing in the initial operation is detected and the damage is easily erroneously determined even though the heat exchanger is not damaged. .

Further, in the detection device 90 shown in FIG. 6, similarly, the heat medium overflowed with the operation of the system due to excessive replenishment of the heat medium to the replenishing means 70 and 80 stays in the recovery container 91, and erroneous determination occurs. There was a fear.
Moreover, in the detection apparatus 90 shown in FIG. 6, the saturation vapor pressure of antifreeze liquids, such as ethylene glycol and propylene glycol, used as a heat medium is remarkably low compared with water. The saturated vapor pressure of ethylene glycol is approximately 1/330 times that of water at 20 ° C., and the saturated vapor pressure of propylene glycol is approximately 1/220 times that of water at 20 ° C. For this reason, once the antifreeze liquid stays in the recovery container 91, it stays without evaporating for a long period of time, and normal detection cannot be performed until the antifreeze liquid evaporates.

  This invention is proposed in view of the said situation, and provides the heat exchanger breakage detection apparatus which can distinguish correctly the failure | damage of the heat exchanger incorporated in heating apparatuses, such as a hot-water supply apparatus and a cogeneration system. With the goal.

  The invention according to claim 1, which is proposed to achieve the above object, has at least one or more primary circulation flow paths having supply means for supplying a heat medium on the flow paths for circulating the heat medium, and the primary circulation. A heat exchanger breakage detecting device for use in a heating device formed by thermally connecting a secondary flow path for flowing a heat medium in a higher pressure state than the flow path through a heat exchanger, the primary circulation A heat medium recovery unit that recovers the heat medium that has overflowed from the replenishment unit of the flow path, and the heat medium recovery unit discharges the heat medium flowing in from the replenishment unit to the outside with a predetermined flow rate as an upper limit; A residence amount detection sensor for detecting the residence amount of the heat medium in the heat medium recovery unit, and the heat exchanger is damaged when the residence amount detection sensor detects residence of the heat medium at a predetermined breakage detection level or higher. It is configured to discriminate.

Here, the factors that cause the heat medium and water to flow from the replenishing means arranged in the primary circulation flow path to the heat medium recovery part of the heat exchanger breakage detection device of the present invention will be considered.
As a first factor, when the surroundings of the replenishing means are in a hot and humid environment and the outside air temperature is low, a large amount of condensed water adheres to the overflow pipe connecting the replenishing means and the heat medium recovery unit. There is a case where the condensed water flows into the heat medium recovery unit.

  The second factor is that heating and circulation of the heat medium in the primary circulation passage is started in a state where the heat medium is excessively replenished to the vicinity of the overflow level in the replenishing means, and the expanded heat medium overflows from the replenishing means and heats up. The case where it flows to a medium collection | recovery part is mentioned.

  The third factor is that the internal partition of the heat exchanger is damaged, the primary circulation channel and the secondary channel are in communication, and the heat medium in the secondary channel, which is at high pressure, is damaged in the heat exchanger. There is a case where the heat medium overflows from the replenishing means arranged in the primary circulation flow path through the portion and flows into the heat medium recovery section.

  Of these factors that cause the heat medium and water to flow into the heat medium recovery unit, the inflow of condensed water (first factor) may continue, but the amount of inflow is very small. In addition, the inflow of the heat medium at the initial stage of heating due to excessive supply of the heat medium (second factor) may temporarily increase, but does not continue for a long time. However, the inflow of the heat medium caused by the partition failure (third factor) of the heat exchanger is large and continues for a long time.

  According to the present invention, since the heat medium recovery part is provided in the heat medium recovery part, the amount of inflow of water is very small and less than the upper limit flow rate of the heat medium discharge part as in the generation of condensed water (first factor). In this case, water is discharged as it is without staying in the heat medium recovery unit. In addition, when the amount of inflow of the heat medium temporarily increases above the upper limit flow rate of the heat medium discharge unit, such as excessive supply of the heat medium (second factor), the heat medium exceeding the upper limit flow rate temporarily It stays inside the heat medium recovery unit. However, the heat medium staying with the decrease in the inflow amount is immediately discharged to the outside.

  On the other hand, when the inflow amount of the heat medium is longer than the upper limit flow rate of the heat medium discharge unit for a long time as in the case of the partition failure of the heat exchanger (third factor), the upper limit flow rate of the heat medium discharge unit is exceeded. The heat medium stays continuously, and the amount of heat medium staying in the heat medium recovery section increases with time.

  Therefore, according to the present invention, the flow rate of the heat medium flowing into the heat medium recovery unit due to the partition wall damage (third factor) of the heat exchanger is larger than the upper limit flow rate of the heat medium discharge unit, and Detecting the upper limit flow rate of the heat medium discharge unit and the stagnation amount detection sensor so that the stagnation amount of the heat medium flowing into the heat medium recovery unit becomes smaller than the damage detection level due to excessive supply of the heat medium (second factor) By setting the level, it is possible to accurately determine only the failure of the heat exchanger. Further, according to the present invention, the upper limit flow rate of the heat medium discharge unit and the damage detection level of the staying amount detection sensor can be individually set according to the heating device provided with the heat exchanger damage detection device, and the design freedom High degree.

  In the present invention, a liquid level sensor or the like can be used as the staying amount detection sensor. In other words, if the heat medium recovery unit is a container having a box shape or a bottomed cylindrical shape, the amount of heat medium retained in the heat medium recovery unit is proportional to the retention depth. Therefore, it is possible to detect the staying amount equivalently by detecting the liquid level of the heat medium staying in the heat medium recovery unit with the liquid level sensor.

  When the heat medium has conductivity, a general-purpose electrode type liquid level sensor or the like can be used as the liquid level sensor, and the manufacturing cost can be reduced. Further, when the heat medium does not have conductivity, it is possible to accurately detect the retention amount of the heat medium using a reflective or transmissive optical liquid level sensor.

  Further, in the present invention, the heat medium discharge section has a structure in which a discharge pipe penetrating in the vertical direction is provided at the bottom of the heat medium recovery section, and an opening is provided in the peripheral wall portion of the discharge pipe in the vicinity of the bottom surface of the heat medium recovery section. be able to. According to this configuration, the upper limit flow rate of the heat medium discharge unit can be appropriately set by adjusting the area of the opening. Further, according to this configuration, the height from the bottom surface of the heat medium recovery unit to the upper end of the discharge pipe is set higher than the damage detection level, so that the heat medium is recovered due to the partition failure (third factor) of the heat exchanger. The heat medium staying over the upper end of the discharge pipe can be discharged outside while maintaining the staying amount of the heat medium flowing into the section at a level higher than the breakage detection level. Accordingly, it is possible to accurately detect the partition wall breakage while preventing the heat medium flowing into the heat medium recovery unit from overflowing due to the partition wall breakage.

  In addition to the above configuration, the heat medium discharge section can be configured using a discharge pipe using a normal circular pipe or a square pipe, a discharge pipe provided with a flow restriction orifice inside, and the like. Can be provided at the bottom of the heat medium recovery unit to constitute a heat exchanger breakage detection device.

  Further, in the present invention, when a breakage of the heat exchanger is detected, it is possible to perform abnormality notification such as abnormality display or alarm ringing, or to stop the operation of the heating device in addition to these abnormality notifications. is there.

  According to a second aspect of the present invention, in the heat exchanger breakage detecting device according to the first aspect, when the staying amount detection sensor continuously detects the stay of the heat medium at or above the breakage detection level for a predetermined time, the heat exchanger It is configured to discriminate it from damage.

  Depending on the heating device provided with the heat exchanger, the amount of heat medium that flows into the heat medium recovery unit due to excessive replenishment of the heat medium to the replenishment means (second factor) exceeds the damage detection level of the retention amount detection sensor. Cases arise. In this case, in order to eliminate detection due to excessive replenishment of the heat medium (second factor), it is necessary to set the breakage detection level higher than the retention amount of the heat medium due to the second factor. For this reason, it is necessary to adjust the attachment position of the retention amount detection sensor for each heating device provided with the heat exchanger breakage detection device.

  According to the present invention, even when the damage detection level of the staying amount detection sensor is fixedly set, by appropriately setting the time during which the staying amount exceeding the breakage detection level is continuously detected, It is possible to eliminate erroneous determination for temporary residence factors such as excessive heating medium replenishment (second factor). In other words, even when the damage detection level of the staying amount detection sensor is fixedly set, by appropriately setting the time for which the detection signal continues, the staying factor that is eliminated in a short time is eliminated, Only the partition failure (third factor) of the heat exchanger can be accurately extracted.

  Therefore, when the liquid level sensor is used as the staying amount detection sensor of the heat exchanger breakage detection device of the present invention, the duration of the detection signal can be set without changing the position where the liquid level sensor is attached to the heat medium recovery unit. It is possible to cope with the change setting, the laying work can be performed efficiently, and the adjustment work becomes easy.

  According to a third aspect of the present invention, in the heat exchanger breakage detecting device according to the first or second aspect, the heat medium discharge section is configured such that the discharge amount per minute is 50 cc or more and less than 200 cc.

  The discharge amount of the heat medium discharge unit can be appropriately set according to the flow rate of the heat medium flowing into the heat medium recovery unit due to the partition wall damage (third factor) of the heat exchanger. However, when the discharge amount of the heat medium discharge unit is less than 50 cc per minute, clogging is likely to occur due to dust or the like mixed in the heat medium, and it is necessary to adopt a special structure for preventing clogging. Will increase.

  In addition, when the discharge amount of the heat medium discharge unit is 200 cc or more, inflow of the heat medium caused by excessive replenishment of the heat medium to the replenishing means (second factor) or damage to the heat exchanger partition (third factor) The discharge amount becomes excessive with respect to the amount, and the staying amount of the heat medium in the heat medium recovery unit is lowered, and detection by the staying amount detection sensor becomes difficult. The discharge amount of the heat medium discharge unit is preferably in the range of 50 cc or more and less than 200 cc per minute, and about 100 cc per minute is optimal.

  According to a fourth aspect of the present invention, in the heat exchanger breakage detecting device according to any one of the first to third aspects, the heating device is a hot water supply device, and the secondary flow paths are a hot water supply flow path and a water supply flow path. The hot water supply channel side is heated with at least one of the heat source provided in the secondary flow path or the heat exchanger provided between the primary circulation flow path and water supplied through the water supply flow path. And the replenishment means for the primary circulation flow path is open to the atmosphere.

  According to the present invention, the heating device includes a secondary flow path connected to the water supply flow path and the hot water supply flow path, and causes the water supplied through the water supply flow path to flow into the secondary flow path so that the heat source section or It functions as a hot water supply device that heats at least one of the heat exchangers provided between the primary circulation flow path and discharges the heated hot water to the hot water supply flow path.

  Further, according to the present invention, the replenishment means for the primary circulation flow path is an air release type. In addition, since the secondary flow path is connected to the water supply flow path, not only when hot water supply is stopped, but also during hot water supply, hot water flowing through the secondary flow path is applied with hot water pressure and flows through the secondary flow path. The hot water to be used has a high pressure with respect to the heat medium flowing in the primary circulation flow path. Thereby, it becomes possible to accurately detect the breakage of the heat exchanger by providing the heat exchanger breakage detection device of the present invention in the hot water supply device as the heating device.

  In the present invention, the primary circulation channel can be, for example, an exhaust heat circulation channel that circulates exhaust heat generated by a power generation device or the like provided in the hot water supply device. According to this configuration, the exhaust heat generated in the power generation device or the like is heat-exchanged to the heat medium to circulate through the exhaust heat circulation flow path, and the heat from the heat medium flowing through the exhaust heat circulation flow path or another heat source unit A hot water supply device or a cogeneration system for heating hot water flowing in the next flow path can be constructed, and the heat exchanger breakage detection device of the present invention can be used to detect breakage of the heat exchanger.

  According to a fifth aspect of the present invention, in the heat exchanger breakage detecting device according to the fourth aspect, the secondary flow path can form a circulation flow path, and heat exchange provided between at least the primary circulation flow path The heating medium circulating in the other primary circulation flow path connected to the secondary flow path via another heat exchanger is heated by the heated hot water while circulating the hot water heated in the vessel. Yes.

  According to the present invention, for example, one of the primary circulation channels is configured as an exhaust heat circulation channel that circulates by exchanging heat generated in the power generation device or the like with a heat medium, and is different from the primary circulation channel. The primary circulation channel can be a heating circulation channel that circulates the heat medium to the heating terminal. According to this configuration, the hot water circulating in the secondary flow path is heated by the heat of the heat medium circulating in the exhaust heat circulation flow path, and the heating circulation flow path is further heated by the hot water circulating in the secondary flow path. The circulating heat medium can be heated. As a result, it is possible to construct a hot water supply device and a cogeneration system having a hot water supply function and a heating function as a heating device, and it is possible to detect a heat exchanger breakage by providing the heat exchanger breakage detection device of the present invention. It becomes.

  According to a sixth aspect of the present invention, in the heat exchanger breakage detecting device according to the fourth or fifth aspect, the secondary flow path can form a circulation flow path including a heat load, and at least the primary circulation flow. It is set as the structure which circulates the hot water heated with the heat exchanger provided between the path | routes, and supplies heat to a heat load.

  According to the present invention, for example, the primary circulation channel is used as an exhaust heat circulation channel that circulates by exchanging heat generated in the power generation device or the like with a heat medium, and a storage tank that stores hot water is used as the heat of the secondary channel. A configuration as a load can be adopted. According to this configuration, the hot water circulating through the secondary flow path is heated by the heat of the heat medium circulating through the exhaust heat circulation flow path, and the hot water circulating through the secondary flow path is stored in the storage tank. it can. As a result, a storage type hot water supply device or a cogeneration system for storing hot water for hot water supply can be constructed as a heating device, and the heat exchanger breakage detection device of the present invention can be provided to detect breakage of the heat exchanger. Become.

  According to a seventh aspect of the present invention, in the heat exchanger breakage detecting device according to any one of the fourth to sixth aspects, the detection of the amount of staying in the heat medium in the heat medium recovery unit by the staying amount detection sensor It is set as the structure performed during the period when it stops.

  Here, during hot water supply, hot water corresponding to the open state of the hot-water tap is discharged from the hot-water supply channel by the supply pressure of the water supply channel. Therefore, during hot water supply, the pressure of the hot water flowing through the secondary flow path is lower than the water supply pressure. On the other hand, during the hot water supply stop, the water supply pressure in the water supply channel is applied to the hot water in the secondary channel as it is. That is, the pressure applied to the hot water in the secondary flow path is higher when hot water supply is stopped than when hot water is supplied. For this reason, when the heat exchanger is damaged, the amount of the heat medium flowing into the heat medium recovery section overflows from the replenishing means when the hot water supply is stopped as compared to during hot water supply.

  According to the present invention, the amount of staying of the heat medium in the heat medium recovery unit is detected while hot water supply is stopped. That is, when the pressure in the secondary channel is high, the amount of heat medium retained in the heat medium recovery unit is detected. As a result, compared to detection during hot water supply, a large amount of hot water can flow into the primary circulation channel side through the damaged part due to the high pressure in the secondary channel, and the damaged state of the partition wall is minor. It is also possible to perform damage determination. Moreover, when the breakage state of the partition walls is the same, it is possible to perform breakage determination in a shorter time than during hot water supply.

  In the present invention, the period during which hot water supply is stopped can be set by directly detecting the state in which the flow of hot water in the hot water supply passage is stopped. Further, instead of directly detecting the flow of hot water in the hot water supply flow path, it may be fixedly set at midnight or the like when hot water supply will not be performed. It is also possible to store past hot water supply results as data and set a period during which no hot water supply is performed based on the data.

  According to an eighth aspect of the present invention, in the heat exchanger breakage detection device according to any one of the fourth to sixth aspects, the staying amount detection sensor causes the heat medium to stay above the breakage detection level of the heat medium recovery unit. It is set as the structure which performs the discrimination | determination of breakage including the breakage condition of a heat exchanger according to the presence or absence of hot water supply at the time of detection.

  As described above, the pressure applied to the hot water in the secondary channel is higher during hot water supply stop than during hot water supply. By the way, when there is little damage condition of the heat exchanger, that is, when the damage opening of the partition wall generated in the heat exchanger is small, the hot water flowing into the primary circulation channel side during the hot water supply in which the pressure of the secondary channel decreases The amount of hot water flowing into the primary circulation channel increases during the hot water supply stop when the pressure in the secondary channel increases. In other words, if the partition wall of the heat exchanger is minor, the amount of heat medium flowing into the heat medium recovery unit during hot water supply and when hot water supply is stopped, that is, the amount of heat medium retained in the heat medium recovery unit is large. There is a difference. Therefore, by appropriately setting the upper limit flow rate of the heat medium discharge section, if the hot water supply is stopped when the staying amount detection sensor detects the damage level, it is determined that the heat exchanger partition wall damage is minor. Can do.

  On the other hand, when the breakage of the heat exchanger progresses and the breakage opening of the partition wall expands, the amount of hot water flowing into the primary circulation channel increases even during hot water supply in which the pressure in the secondary channel decreases. For this reason, the difference in the amount of inflow of the heat medium into the heat medium recovery unit during hot water supply and when the hot water supply is stopped, that is, the difference in the heat medium retention amount in the heat medium recovery unit is reduced. Accordingly, by appropriately setting the upper limit flow rate of the heat medium discharge section, it is possible to determine that the partition wall damage of the heat exchanger is large if hot water is being supplied when the stay amount detection sensor detects a predetermined stay amount. .

  According to the present invention, by referring to the presence or absence of hot water supply when the staying amount detection sensor detects the stay of the heat medium at the breakage detection level, the breakage determination including the breakage state of the heat exchanger is performed based on the above reason. It is possible to perform accurately.

According to the first aspect of the present invention, it is possible to provide a heat exchanger breakage detecting device capable of accurately detecting breakage of the heat exchanger of the heating device.
According to the second aspect of the present invention, it is possible to provide a heat exchanger breakage detection device that can accurately detect breakage of the heat exchanger by simply changing and setting the detection time according to the heating device.
According to the third aspect of the present invention, it is possible to provide a heat exchanger breakage detection device that reduces the manufacturing cost while preventing clogging of the heat medium discharge section.
According to invention of Claims 4-6, the heat exchanger failure | damage detection apparatus which can detect correctly the failure | damage of the heat exchanger of the hot water supply apparatus as a heating apparatus can be provided.
According to the seventh and eighth aspects of the invention, it is possible to provide a heat exchanger breakage detecting device capable of accurately detecting the breakage of the hot water supply device as the heating device according to any of claims 4 to 6.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a flow path system diagram of a cogeneration system (heating device) 1 including a heat exchanger breakage detection device 20 according to the present embodiment. 2A is a cross-sectional view showing a detailed configuration of the heat exchanger breakage detection device 20 of FIG. 1, and FIG. 2B is an enlarged perspective view of a heat medium discharge portion of the heat exchanger breakage detection device 20 of FIG. FIG. 2 and FIG. 2C are partial enlarged cross-sectional views of a modification of the heat medium discharge unit. FIG. 3 is a flowchart showing control accompanying detection by the heat exchanger breakage detection device 20 in the cogeneration system 1 of FIG. 4 (a) is a graph showing an example in which condensed water stays, FIG. 4 (b) is a graph showing an example in which a heat medium overflowed due to excessive supply to the supply means, and FIG. 5 (a). ) Is a graph showing an example in which the heat medium overflowing from the replenishing means stays when the heat exchanger partition wall damage is slight, and FIG. 5B is a diagram showing an overflow from the replenishing means when the heat exchanger partition wall damage is large. It is a graph which shows the example in which a heat carrier retains.

  Of the configurations shown in FIG. 1, the cogeneration system 1 has the same configuration as the system 100 shown in FIG. Accordingly, the same components are denoted by the same reference numerals, and redundant description is omitted.

  The cogeneration system 1 includes a hot water supply device 10, a power generation device 11, and a control device 12, and has a configuration in which the heat exchanger breakage detection device 20 of the present invention is added to the system 1. The control device 12 is connected to each sensor, control valve, circulation pump, and the like provided in the hot water supply device 10 and the power generation device 11 and has a function of supervising control such as a hot water supply operation and a power generation operation.

  The heating circulation flow path L1 of the hot water supply device 10 includes an open air replenishment means 70 on the circulation return path L1b. The replenishing means 70 is configured by combining a replenishing tank 71 having an overflow discharge pipe 73 and an electrode type liquid level sensor 74 and a replenishing pipe 75 having a replenishing valve 72, and a heat medium circulating through the heating circulation passage L1. Has the function of replenishing.

  In other words, the replenishing means 70 monitors the amount of the heat medium staying in the replenishing tank 71 by the liquid level sensor 74, and when the staying heat medium falls to the minimum level, the replenishing valve 72 is controlled to open and the replenishing pipe The heat medium is supplied from 75 to the supply tank 71. When the heat medium staying amount in the replenishing tank 71 rises to the maximum level due to replenishment, the liquid level sensor 74 detects it and performs an operation for closing the replenishing valve 72. As a result, the heat medium in the range from the lowest level to the maximum level is always retained in the replenishing tank 71 to prevent the heat medium circulating in the heating circulation flow path L1 from being reduced.

Further, the exhaust heat circulation flow path L2 of the power generation apparatus 11 includes replenishment means 80 having the same configuration as the replenishment means 70 provided in the heating circulation flow path L1. The replenishing means 80 is configured by combining a replenishing tank 81 having an overflow discharge pipe 83 and an electrode-type liquid level sensor 84 and a replenishing pipe 85 having a replenishing valve 82, and is discharged by the same operation as the replenishing means 70 described above. It has a function of replenishing the heat medium circulating in the heat circulation flow path L2.
In the present embodiment, an antifreeze solution obtained by diluting ethylene glycol with water is used as the heat medium circulating in the heating circulation passage L1 and the exhaust heat circulation passage L2.

  As shown in FIG. 1, the heat exchanger breakage detection device 20 of the present embodiment includes an overflow discharge pipe 73 extending from the supply means 70 provided in the heating circulation flow path L1, and a supply means 80 provided in the exhaust heat circulation flow path L2. And an overflow discharge pipe 83 extending from the central portion.

  As shown in FIGS. 1 and 2A, the heat exchanger breakage detection device 20 is configured by including an electrode-type liquid level sensor 22 in a box-shaped heat medium recovery unit 21 whose upper surface is open to the atmosphere. A heat medium discharge unit 23 is provided at the bottom 21 a of the heat medium recovery unit 21. As shown in FIG. 2B, the heat medium discharge portion 23 is formed by penetrating and fixing a discharge pipe 24 to the bottom portion 21 a of the heat medium recovery portion 21. The discharge pipe 24 is a circular pipe having a through hole 24b therein, and a circular opening 24a is formed in the peripheral wall. The opening 24 a is a peripheral wall of the discharge pipe 24 and is provided so that the lower end of the opening is positioned at a height H upward from the bottom surface 21 b of the heat medium recovery unit 21. Further, the height from the bottom surface 21 b of the heat medium recovery unit 21 to the upper end 24 c of the discharge pipe 24 is set higher than the breakage detection level of the liquid level sensor 22. In the present embodiment, a circular pipe is used for the discharge pipe 24, but a square pipe may be used. In addition, the opening 24a is not limited to a circular shape, and may have a square shape or other shapes.

  The opening 24a provided in the discharge pipe 24 has a function of discharging the heat medium flowing into the heat medium recovery unit 21 to the outside through the through hole 24b with a predetermined flow rate as an upper limit. Further, when the heat medium continuously flows into the heat medium recovery unit 21, the through hole 24 b of the discharge pipe 24 discharges the heat medium staying beyond the upper end 24 c of the discharge pipe 24 to the outside. It has an overflow function that prevents the medium from overflowing. The opening area of the through hole 24b is set so as to be a larger discharge amount than the maximum flow rate of the heat medium flowing into the heat medium recovery unit 21.

  Here, foreign matter such as dust or dust may enter the heat medium recovery unit 21. When the heat medium flows into the heat medium recovery part 21 with the foreign matter invading and collecting on the bottom surface 21b, the foreign material concentrates and flows toward the opening 24a of the discharge pipe 24 along the bottom surface 21b. Prone to clogging.

  In the present embodiment, as described above, the opening 24 a is provided in the peripheral wall of the discharge pipe 24 above the bottom surface 21 b of the heat medium recovery unit 21 by a height H. Therefore, when the heat medium flows in, the foreign matter that flows toward the opening 24a along the bottom surface 21b stays in the lower part of the opening 24a, and a part of the foreign material is dispersed and flows into the upper opening 24a. This prevents foreign substances from concentrating and flowing into the opening 24a, thereby preventing clogging. The height H at which the opening 24a is provided can be set as appropriate according to the amount of foreign matter retained.

  In the present embodiment, by adjusting the opening area of the opening 24a provided in the discharge pipe 24, the discharge flow rate of the heat medium discharge unit 23 is set to 100 cc per minute. This is because the opening area where the discharge flow rate is less than 50 cc has a small opening area and clogging is likely to occur, and if the discharge flow rate exceeds 200 cc per minute, there is no more heat medium inflow flow rate. This is because damage cannot be detected, and only a relatively large damage state can be detected. Note that the discharge amount of the heat medium discharge unit 23 can be appropriately set in consideration of the capacity of the heat medium recovery unit 21 in the above-described range.

  The liquid level sensor 22 detects the amount of heat medium staying by detecting the liquid level staying in the heat medium recovery unit 21. When the liquid level sensor detects a liquid level higher than a predetermined damage detection level, An operation of sending a detection signal to the control device 12 is performed.

  As shown in FIGS. 1 and 2B, the heat exchanger breakage detection device 20 is provided at a portion where an overflow discharge pipe 73 extending from the replenishing means 70 and an overflow discharge pipe 83 extending from the replenishing means 80 are gathered in one place. It is done. In other words, the overflow discharge pipes 73 and 83 are attached and fixed so that the front ends of the overflow discharge pipes 73 and 83 are located inside the heat medium recovery unit 21 of the heat exchanger breakage detection device 20.

  Next, operation | movement of the cogeneration system 1 and operation | movement of the heat exchanger breakage detection apparatus 20 of this embodiment are demonstrated. In addition, although the cogeneration system 1 shown in FIG. 1 can perform each operation | movement of hot water supply operation, heating operation, and storage operation independently or in parallel, when hot water supply operation is performed in parallel with heating operation As an example, the operation of the heat exchanger breakage detection device 20 will be described.

  When the heating operation is started, the control device 12 closes the storage control valve 63 of the hot water supply device 10, opens the heating heat exchange electromagnetic valve 66, and connects the heating heat exchanger 64 to the heat source flow path H. Thus, a heat source circulation channel (secondary channel) L is formed. Then, the circulating pump 60 is driven to circulate hot water through the heat source circulation flow path L. Further, the control device 12 drives the circulation pump 67 to circulate the heat medium in the heating circulation flow path L1. Further, the control device 12 activates the gas engine 76 of the power generation device 11 to drive the generator 77, and the generated electric power is supplied to the external electric equipment, and the circulation pump 78 is driven to exhaust the heat circulation circuit. A heat medium is circulated through L2.

  When the heating operation is started by the above control, the exhaust heat generated in the gas engine 76 is heat-exchanged to the heat medium flowing through the exhaust heat circulation passage L2, and is circulated through the exhaust heat circulation passage L2 and heated. The heat of the heat medium is transmitted to the hot water circulating through the heat source circulation flow path L2 by the exhaust heat exchanger 61. Further, the heat of the hot water heated by the exhaust heat exchanger 61 and circulating through the heat source circulation channel L2 is transmitted to the heat medium circulating through the heating circulation channel L1 by the heating heat exchanger 64. Thereby, the heated heat medium circulates to the heating terminal 68 and the heating operation is performed.

  By the way, the surroundings of the replenishing means 70 provided in the hot water supply apparatus 10 and the replenishing means 80 provided in the power generation apparatus 11 become hot and humid as the system operates. Moreover, since the overflow discharge pipes 73 and 83 are extended from the replenishing means 70 and 80 to the heat exchanger breakage detection device 20, the condensed water easily adheres to the overflow discharge pipes 73 and 83 when the outside air temperature is low. . For this reason, the adhering condensed water flows along the overflow discharge pipes 73 and 83 and flows into the heat medium recovery unit 21 of the heat exchanger breakage detection device 20. However, the amount of condensed water flowing into the heat medium recovery unit 21 is small compared to the upper limit flow rate of the heat medium discharge unit 23. Therefore, as shown in FIG. 4A, the condensed water that has flowed into the heat medium recovery unit 21 is discharged to the outside with little stagnation.

  Further, when the cogeneration system 1 shown in FIG. 1 is laid, the heat medium is often replenished to the replenishing means 70 and 80 in many cases. For this reason, the heat medium overflowed from the replenishing means 70 and 80 flows into the heat medium recovery part 21 through the overflow discharge pipes 73 and 83 and is discharged from the heat medium discharge part 23 to the outside. In this state, each of the replenishing means 70 and 80 is in a state where the heat medium has been replenished to the overflow level. However, when the heating operation is started in this state, the heat medium circulating in the exhaust heat circulation flow path L2 and the heating circulation flow path L1 is heated and expands, and the heat medium overflowed as shown in FIG. 4B. Temporarily flows into the heat medium recovery unit 21 through the overflow discharge pipes 73 and 83.

  When the inflow amount of the heat medium into the heat medium recovery unit 21 exceeds the discharge amount of the heat medium discharge unit 23, the heat medium stays inside the heat medium recovery unit 21 as illustrated in FIG. When the staying amount reaches the breakage detection level in step 200 in FIG. 3, a detection signal is sent from the liquid level sensor 22 to the control device 12. Upon receiving the detection signal, control device 12 determines whether or not hot water is being supplied in step 202 in FIG. If the hot water supply is stopped, the timer is started after turning on the large damage flag if hot water is being supplied, and the liquid level sensor 22 continuously detects the damage detection level until the timer expires. Whether or not (see steps 200 to 205, 209, 210 in FIG. 3 and FIG. 4B).

  The large breakage flag is a flag indicating a breakage state of the heat exchanger, which will be described later, and is turned on by the control device 12 when the liquid level sensor 22 detects that the heat medium stays above the breakage detection level during hot water supply. Flag to be Further, the time-up time t of the timer is set to be longer than the time when the heat medium retention amount of the heat medium recovery unit 21 temporarily exceeds the damage detection level due to the excessive supply of the heat medium of the replenishing means 70 and 80. .

  The control device 12 monitors whether or not the damage detection level continues until the timer expires while circulating through steps 200 to 203 and 205 while the hot water supply is stopped. Further, during hot water supply, it is monitored whether the damage detection level continues until the timer expires while circulating through steps 200 to 202, 209, 203, 205. However, the heat medium that overflows from the replenishing means 70 and 80 due to the excessive replenishment of the heat medium is temporary, and the heat medium that stays in the heat medium recovery unit 21 before the timer expires from the heat medium discharge unit 23. It is discharged and the detection of the damage detection level is canceled. As a result, the transmission of the detection signal from the liquid level sensor 22 to the control device 12 is stopped, and the control device 12 resets the timer and turns off the large breakage flag, so that the detection signal from the liquid level sensor 22 arrives again. (See steps 200 and 212 to 214 in FIG. 3 and FIG. 4B).

  Thus, even if the heat medium excessively supplied to the replenishing means 70 and 80 with the start of the heating operation temporarily overflows, the heat exchanger breakage detection device 20 detects the breakage of the heat exchanger by mistake. Control is performed to prevent this. Further, when the inflow of the heat medium temporarily stops, all of the staying heat medium is discharged from the heat medium discharge unit 23 to the outside, and the heat medium does not remain in the heat medium recovery unit 21. Accordingly, it is possible to prevent the heat medium from remaining and causing erroneous detection.

  On the other hand, during the heating operation, for example, when a partition wall breakage of the heating heat exchanger 64 of FIG. 1 occurs, the high pressure that is connected to the water supply channels 50 and 51 and flows through the heat source circulation channel (secondary channel) L Of hot water flows into the heating circulation channel (primary circulation channel) L1 through the damaged portion of the heating heat exchanger 64. For this reason, the heat medium overflows from the replenishing means 70, and the overflowed heat medium flows into the heat medium recovery unit 21 via the overflow discharge pipe 73. Since the inflow of the heat medium due to the partition wall breakage of the heating heat exchanger 64 continues, when the retention amount of the heat medium recovery unit 21 increases and exceeds the breakage detection level, a detection signal is sent from the liquid level sensor 22 to the control device 12. (See steps 200 and 201 in FIG. 3).

  When the detection signal is sent, control device 12 determines whether or not hot water is being supplied. If the hot water supply is stopped, the timer is started after turning on the large damage flag if hot water is being supplied, and the liquid level sensor 22 continuously detects the damage detection level until the timer expires. (See steps 200 to 205, 209, and 210 in FIG. 3).

  When the breakage detection level continues and the timer times out, the control device 12 refers to the breakage large flag, and if the breakage large flag is off, determines that the breakage state of the heat exchanger 64 is small and issues an abnormality notification. . If the large breakage flag is ON, it is determined that the heat exchanger 64 is in a large breakage state, and an abnormality is notified (see steps 205 to 208, 211 in FIG. 3). The abnormality notification can be performed by an appropriate method such as abnormality display or alarm sounding.

  In other words, when the partition wall of the heating heat exchanger 64 is minor, as shown in FIG. 5A, during the hot water supply with a low pressure in the heat source circulation channel (secondary channel) L, the heat medium recovery unit When the pressure of the heat source circulation channel (secondary channel) L increases as the hot water supply stops, the amount of the heat medium flowing into the heat source 21 does not stay up to the level of damage detection. It is considered that the amount of heat medium flowing in reaches the level of damage detection. Based on this, in the heat exchanger breakage detection device 20 of the present embodiment, it is determined that the heating heat exchanger 64 is lightly broken when the amount of staying of the heat medium reaches the breakage detection level while hot water supply is stopped. doing.

  On the other hand, when the partition wall damage of the heating heat exchanger 64 becomes large, as shown in FIG. 5B, the heat medium recovery unit 21 even during hot water supply where the pressure of the heat source circulation channel (secondary channel) L is low. It is considered that the heat medium stays up to the damage detection level because of the large amount of heat medium flowing into. Based on this, in the heat exchanger breakage detection device 20 of the present embodiment, when the amount of staying of the heat medium reaches the breakage detection level during hot water supply, it is determined that the heating heat exchanger 64 is largely damaged. Yes.

  In addition, in the heat exchanger breakage detection apparatus 20 of this embodiment, it is set as the structure which gave the overflow function to the discharge pipe 24 of the thermal-medium discharge part 23 like FIG.2 (b). As a result, as shown in FIGS. 5A and 5B, even when the flow of the heat medium continues to the heat medium recovery section 21 due to the partition wall breakage, the heat medium stays beyond the upper end 24c of the discharge pipe 24. Is discharged to the outside through the through hole 24 b of the discharge pipe 24, and is prevented from overflowing from the heat medium recovery unit 21.

  In the above description, the operation of the heat exchanger breakage detection device 20 when the heating heat exchanger 64 is broken is described. However, even when the exhaust heat exchanger 61 is broken, the breakage detection can be performed by the same operation. Is possible.

  As described above, according to the heat exchanger breakage detection device 20 of the present embodiment, with a very simple configuration, erroneous detection due to overflow or condensed water due to excessive replenishment of the heat medium to the replenishing means 70 and 80 is eliminated. In addition, it is possible to accurately detect breakage including the breakage state of the heating heat exchanger 64. As a result, it is possible to prevent a problem that the heat medium circulating in the heating circulation flow path L1 and the exhaust heat circulation flow path L2 is mixed into the hot water in the heat source circulation flow path L in the event that a water break occurs. It becomes possible. Further, it becomes possible to detect the breakage of the heat exchanger at an early stage and perform maintenance.

In the above-described embodiment, a configuration in which the exhaust pipe 24 having the opening 24a is provided at the bottom of the heat medium recovery unit 21 as the heat medium discharge unit 23 is employed. However, the present invention is not limited to such a configuration. Absent. For example, it is possible to provide a heat medium discharge section 23 ′ having the configuration shown in FIG. The heat medium discharge part 23 ′ in FIG. 2C is configured by projecting a cylindrical discharge pipe 25 downward from the bottom 21 a of the heat medium recovery part 21. The discharge pipe 25 is formed by gently projecting a part of the inner peripheral wall inward in the radial direction to form a flow restriction orifice 25a, and the heat medium staying in the heat medium recovery section 21 is externally provided with a predetermined flow rate as an upper limit. Can be discharged.
In addition, in the heat medium discharge section 23 ′ of FIG. 2C, a circular pipe or a square pipe that is not provided with the flow restriction orifice 25 a can be used as the discharge pipe 25.

  Further, in the embodiment, the overflow heat pipes 73 and 83 extending from the replenishing means 70 and 80 are collected in one place and the overflowing heat medium is retained in one heat exchanger breakage detection device 20. It is also possible to individually provide the heat exchanger breakage detection device 20 in the vicinity of each of 70 and the replenishing means 80.

  Moreover, in the said embodiment, although demonstrated taking the case of the cogeneration system 1 provided with the storage-type hot-water supply apparatus 10 and the electric power generating apparatus, this invention is not limited to such a structure. For example, it is also possible to provide the heat exchanger breakage detection device 20 of the present invention in a hot water supply device having a hot water supply function and a heating function without providing the storage tank 57. Moreover, not only the hot water supply apparatus 10 and the cogeneration system 1 but two flow paths are thermally connected via a heat exchanger, and one flow path circulates a high-pressure heat medium compared to the other flow path. It can be suitably employed in a heating device having a configuration.

  In the above embodiment, a heat medium having conductivity is used, and an electrode type liquid level sensor 22 is provided in the heat exchanger breakage detection device 20 to detect the liquid level. However, the heat medium is conductive. In the case where the liquid level is not included, it is also possible to detect the liquid level using a reflective or transmissive optical liquid level sensor.

  In the above embodiment, a configuration is adopted in which the liquid level detection sensor 22 determines that the heat exchanger is broken when it continuously detects a level equal to or higher than the breakage detection level for a predetermined time t. It is also possible to adopt a configuration in which the breakage of the heat exchanger is determined when the breakage detection level is detected by appropriately setting the breakage detection level in consideration of the overflow retention amount due to excessive replenishment of the heat medium.

It is a channel system diagram of a cogeneration system provided with a heat exchanger breakage detection device concerning an embodiment of the present invention. (A) is sectional drawing which shows the detailed structure of the heat exchanger damage detection apparatus shown in FIG. 1, (b) is an enlarged perspective view which shows the heat carrier discharge | emission part of the heat exchanger damage detection apparatus of (a), ( c) is an enlarged cross-sectional view showing a modification of the heat medium discharge section. In the cogeneration system of FIG. 1, it is a flowchart which shows the control accompanying the detection of a heat exchanger damage detection apparatus. (A) is a graph which shows the example in which condensed water stagnates, (b) is a graph which shows the example in which the heat medium which overflowed with the excessive replenishment to a replenishment means stagnates. (A) is a graph showing an example in which the heat medium overflowing from the replenishing means stays when the heat exchanger is lightly damaged, and (b) is the heat overflowing from the replenishing means when the heat exchanger is greatly damaged It is a graph which shows the example in which a medium stagnates. It is a flow-path system diagram of the cogeneration system provided with the conventional heat exchanger damage detection apparatus.

Explanation of symbols

F Heat medium H Secondary flow path (heat source flow path)
L1 Primary circulation channel (heating circulation channel)
L2 Primary circulation channel (exhaust heat circulation channel)
1 Heating device (cogeneration system)
10 Heating device (storage type hot water supply device)
20 Heat exchanger breakage detection device 21 Heat medium recovery unit 23 Heat medium discharge unit 22 Residence amount detection sensor (liquid level detection sensor)
50, 51 Water supply flow path 53, 54 Hot water supply flow path 57 Thermal load (storage tank)
62 Heat source (auxiliary heat source)
61 Heat exchanger (exhaust heat exchanger)
64 Heat exchanger (heating heat exchanger)
70, 80 Supply means

Claims (8)

  At least one or more primary circulation flow paths that have supply means for supplying the heat medium on the flow paths and circulate the heat medium; and a secondary flow path that causes the heat medium to flow in a higher pressure state than the primary circulation flow path. A heat exchanger breakage detection device used for a heating device formed by thermal connection through a heat exchanger, wherein a heat medium recovery unit that recovers the heat medium overflowed from the replenishing means of the primary circulation flow path And a heat medium recovery part for discharging the heat medium flowing from the replenishing means to the outside with a predetermined flow rate as an upper limit, and a retention amount for detecting the heat medium retention amount in the heat medium recovery part A heat exchanger breakage detection device comprising: a detection sensor, wherein when the staying amount detection sensor detects staying of a heat medium having a predetermined breakage detection level or more, it is determined that the heat exchanger is broken.   2. The heat exchanger breakage detection according to claim 1, wherein the heat exchanger breakage detection is performed when the staying amount detection sensor continuously detects a stay of a heat medium that is equal to or higher than the breakage detection level for a predetermined time. apparatus.   The heat exchanger breakage detection device according to claim 1 or 2, wherein the heat medium discharge section has a discharge amount of 50 cc or more and less than 200 cc per minute.   The heating device is a hot water supply device, the secondary flow path is connected to a hot water supply flow path and a water supply flow path, and the heat source unit provided with water supplied through the water supply flow path in the secondary flow path or the The hot water discharge channel side is discharged while being heated by at least one of the heat exchangers provided between the primary circulation channel and the replenishing means of the primary circulation channel is open to the atmosphere. The heat exchanger breakage detecting device according to any one of 1 to 3.   The secondary flow path can form a circulation flow path, and at least circulates hot water heated by a heat exchanger provided between the secondary flow path and the secondary flow path to the secondary flow path by the heated hot water. The heat exchanger breakage detection device according to claim 4, wherein the heat medium circulating in another primary circulation flow path connected via another heat exchanger is heated.   The secondary flow path can form a circulation flow path including a heat load, and circulates hot water heated by a heat exchanger provided at least between the primary circulation flow path to supply heat to the heat load. The heat exchanger breakage detecting device according to claim 4 or 5.   The heat exchanger breakage according to any one of claims 4 to 6, wherein the staying amount detection of the heat medium in the heat medium recovery unit by the staying amount detection sensor is performed during a period when hot water supply is stopped. Detection device.   The determination of breakage including breakage status of the heat exchanger is performed according to the presence or absence of hot water supply when the staying amount detection sensor detects staying of the heat medium at or above the damage detection level of the heat medium recovery unit. Item 7. The heat exchanger breakage detection device according to any one of Items 4 to 6.

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