JP2006037849A - Power recovery device and operation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generator, feeding an operating medium fluid without consuming recovered energy and stably. <P>SOLUTION: In the power recovery device including a steam generator 10, an expander 20 and a condenser 30 in which an operating medium is circulated, a liquid supply tank 60 is provided between a high pressure system including the steam generator 10 and a low pressure system including the condenser 30, the condenser 30 and the liquid supply tank 60 are connected to each other by a pipeline 35 so that the operating medium liquid flows from the condenser 30 to the liquid supply tank 60 through a check valve 36, the liquid supply tank 60 and the steam generator 10 are connected to each other by a pipeline 65 so that the operating medium liquid flows from the liquid supply tank 60 to the steam generator 10 through a check valve 66, the liquid supply tank 60 and the high pressure system are connected to each other by a high pressure uniform pressure pipeline 16 having an automatic valve 17, and the liquid supply tank 60 and a low pressure system are connected to each other by a low-pressure system uniform pressure pipeline 26 having an automatic valve 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power recovery device that circulates a working medium using a heat cycle and collects heat energy such as exhaust heat at a relatively low temperature, and in particular, condensate of the working medium generates steam without using a medium circulation pump. The present invention relates to a power recovery device that can send liquid to a container and an operation method thereof.

  As a method for recovering power from exhaust heat or the like, a method using a heat cycle is generally used. Among thermal cycles, those using a Rankine cycle using latent heat of a working medium or a Lorentz cycle similar thereto are well known. In the Rankine cycle, exhaust fluid is used to vaporize the working medium liquid with a steam generator to produce high-pressure working medium steam, which is led to an expander such as a turbine for expansion, and the expanded working medium vapor is liquefied with a condenser. To do. The liquefied working medium liquid is returned to the steam generator again.

  FIG. 1 is a diagram showing a configuration example of this type of power recovery apparatus. The power recovery device includes a steam generator 10 that recovers exhaust heat 1 to generate high-pressure working medium steam, an expander 20 such as a turbine that drives the generator by expanding the generated high-pressure steam, and the expanded high-pressure The condenser 30 is configured to condense and liquefy the vapor, and the working medium flow path 40 that circulates the working medium between these devices. Reference numeral 31 denotes a buffer tank in which the working medium liquid discharged from the condenser 30 is retained.

In the power recovery apparatus having the above-described configuration, the working medium becomes high-pressure working medium vapor in the steam generator 10, is introduced into the expander 20, expands, and is introduced from the expander 20 into the condenser 30 to become a working medium liquid. After that, returning to the steam generator 10 again, the inside of the apparatus is completed. At this time, when the working medium liquid discharged from the condenser 30 is sent to the steam generator 10, if the pressure difference between the condenser 30 and the steam generator 10 is very small, the working medium liquid head or the like is used. Although it is possible to send liquid by using, generally, a medium circulation pump 50 is installed in a pipe 41 communicating between the condenser 30 and the steam generator 10, and liquid is fed by the medium circulation pump 50. There are many cases.
JP 2000-110514 A

However, when the working medium liquid is sent from the condenser 30 to the steam generator 10 using the medium circulation pump 50, the following points are problematic. That is,
(1) Since the working medium liquid discharged from the condenser 30 is a saturated liquid in a substantially saturated state, the suction head (NPSH) of the medium circulation pump 50 is insufficient, and the medium circulation pump 50 is likely to cause cavitation. . Further, if the working medium liquid is supercooled to prevent this, energy recovery efficiency is reduced.

(2) Since the circulation amount of the working medium in the power recovery apparatus is substantially proportional to the heat amount of the exhaust heat 1 supplied to the steam generator 10, the operation of the medium circulation pump 50 is controlled in accordance with the fluctuation of the heat amount. There is a need. However, if this control is not performed well, it is not possible to cope with changes in the circulating amount of the working medium. Then, the working medium liquid introduced into the steam generator 10 becomes excessive and overflows, causing problems such as the working medium liquid entering the breaker 20 and being damaged. Inversely, the medium circulation pump 50 is damaged due to idling, or the working medium liquid introduced into the steam generator 10 becomes too small and becomes empty, causing the internal pressure to rise abnormally.

(3) Since the medium circulation pump 50 is generally driven by electric power, the electric power generated by the power recovered from the exhaust heat 1 is consumed, which causes a reduction in the output of the power recovery device. In particular, when the energy recovery efficiency and power generation efficiency of the power generation apparatus, the pump efficiency of the medium circulation pump 50, and the like are low, the output of the power recovery apparatus is greatly reduced.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described points, and an object of the present invention is to provide a working medium liquid in a stable state without using a medium circulation pump, that is, without consuming recovered power for circulation of the working medium. An object of the present invention is to provide a power recovery device that can be circulated and an operation method thereof.

  The invention described in claim 1 includes a steam generator that recovers exhaust heat and the like to generate high-pressure steam as a working medium, an expander that expands the high-pressure steam, and a condenser that condenses the expanded steam. The level of the working medium of the condenser between the high pressure system including the steam generator connected to the inlet of the expander and the low pressure system including the condenser connected to the outlet of the expander One or a plurality of liquid supply tanks are provided at a lower position than the liquid level of the working medium liquid of the steam generator, and between the condenser and the liquid supply tank, the liquid supply tank is provided between the condenser and the liquid supply tank. So that the working medium liquid flows to the steam generator through an automatic valve or a check valve so that the working medium liquid flows from the supply tank to the steam generator. Connected by piping through an automatic valve or check valve, automatically connects the liquid tank and high pressure system It is connected via a high pressure system equalizing pipe and a liquid supply tank and a low pressure system connected by a low pressure system equalizing pipe having an automatic valve, or via a switching valve that can switch between the liquid tank and the high pressure system and the low pressure system. It is characterized by being connected.

  According to a second aspect of the present invention, in the power recovery device according to the first aspect, a gas-liquid separator is provided on the downstream side of the steam generator, and the working medium liquid separated by the gas-liquid separator is returned to the working medium. It is configured to return to the steam generator by a circulation pump, and the suction port of the working medium recirculation pump and the liquid supply tank are connected by piping through an automatic valve or a check valve.

  According to a third aspect of the present invention, there is provided a motive power provided with a steam generator that recovers exhaust heat and generates high-pressure steam as a working medium, an expander that expands the high-pressure steam, and a condenser that condenses the expanded steam. A method for operating a recovery apparatus, comprising: a working medium for a condenser between a high-pressure system including a steam generator connected to an inlet of the expander and a low-pressure system including a condenser connected to an outlet of the expander A liquid supply tank is installed at a position lower than the liquid level and higher than the working medium liquid level of the steam generator, and the difference between the liquid level of the working medium liquid in the condenser and the liquid level of the working medium liquid in the supply tank When the liquid level of the working medium liquid in the liquid supply tank reaches a predetermined level, the liquid level of the working medium liquid in the liquid supply tank and the operation of the steam generator are supplied. The working medium liquid in the liquid supply tank is fed to the steam generator due to the drop from the liquid level of the medium liquid. The features.

  According to the first aspect of the present invention, a liquid supply tank is provided between a high pressure system including an evaporator connected to the inlet of the expander and a low pressure system including a condenser connected to the outlet of the expander. Connected with a pipe via an automatic valve or a check valve so that the working medium liquid flows from the liquid supply tank to the steam generator between the liquid supply tank and the steam generator. Connected with a pipe through an automatic valve or a check valve so that the working medium liquid flows from the condenser to the feed tank between the condenser and the feed tank and the high-pressure system. Since the supply tank and the low-pressure system are connected by a low-pressure system equalizing pipe with an automatic valve, even if the working medium liquid of the condenser is a saturated liquid or the like, the steam is maintained in a stable state. It can be sent to the generator. Further, since power is not consumed when the working medium liquid is fed, power recovery efficiency does not have to be reduced. Furthermore, since the circulation amount of the working medium that circulates in the apparatus changes according to the amount of thermal energy recovered by the steam generator, it is possible to prevent failures and accidents of the steam generator and the condenser.

  Further, if the liquid supply tank and the high-pressure system or the low-pressure system are connected via a switching valve that can be switched instead of the high-pressure system equalizing pipe and the low-pressure system pressure pipe, the same effect as described above can be obtained with a simple configuration. .

  Further, if a plurality of liquid supply tanks are used, temperature fluctuations in the steam generator are less likely to occur, and the stability and safety of the power recovery device can be improved.

  According to the second aspect of the present invention, the gas-liquid separator is provided on the downstream side of the steam generator, and the working medium liquid separated by the gas-liquid separator is returned to the steam generator by the working medium recirculation pump. In addition to the effects similar to those of the invention according to claim 1, since the suction port of the working medium recirculation pump and the liquid supply tank are connected by piping via an automatic valve or a check valve. Since the working medium liquid temperature at the suction port of the working medium recirculation pump is lowered, the NPSH of the working medium recirculation pump is increased, and the trouble of the working medium recirculation pump is reduced. Moreover, the high-pressure working medium vapor | steam from which the liquid component was removed can be introduce | transduced into an expander.

  According to the third aspect of the present invention, a condenser is provided between a high pressure system including a steam generator connected to the inlet of the expander and a low pressure system including a condenser connected to the outlet of the expander. The liquid supply tank is provided at a position lower than the working medium liquid level of the steam generator and higher than the working medium liquid level of the steam generator, and the liquid level of the working medium liquid in the condenser and the liquid level of the working medium liquid in the liquid supply tank When the liquid level of the working medium liquid in the liquid supply tank reaches a predetermined level, the liquid level of the working medium liquid in the liquid supply tank and the generation of steam Since the working medium liquid in the supply tank is sent to the steam generator due to the drop in the liquid level of the working medium liquid in the condenser, even if the working medium liquid in the condenser is a saturated liquid, etc. Can be sent to the steam generator. Further, since power is not consumed when the working medium liquid is fed, power recovery efficiency does not need to be reduced. Furthermore, since the circulation amount of the working medium that circulates in the apparatus changes according to the amount of thermal energy recovered by the steam generator, it is possible to prevent failures and accidents of the steam generator and the condenser.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 2 is a schematic diagram illustrating a configuration example (Example 1) of the power recovery apparatus according to the embodiment of the present invention. In the power recovery apparatus shown in FIG. 2, the same reference numerals are given to portions common to FIG. 1, and detailed description thereof is omitted here. In other drawings, common portions are denoted by the same reference numerals, and detailed description thereof is omitted. In the following embodiments, a power generation device will be described as an example of a power recovery device. In FIG. 2, a portion including the steam generator 10 connected to the inlet of the turbine 20 as an expander is defined as a high pressure system, and a portion including the condenser 30 connected to the outlet of the turbine 20 is defined as a low pressure system. .

  The liquid supply tank 60 is provided between the high pressure system and the low pressure system, and the working medium liquid in the buffer tank 31 is supplied to the liquid supply tank 60 through a pipe 35 provided with a check valve 36. The working medium liquid in the liquid supply tank 60 is sent to the steam generator 10 through a pipe 65 provided with a check valve 66. In the liquid supply tank 60, the liquid level Y of the working medium liquid 61 staying in the liquid supply tank 60 is the liquid level H of the working medium liquid 32 staying in the buffer tank 31 and the working medium liquid 11 staying in the steam generator 10. It is installed so that it may be located between h and the liquid level position L. The buffer tank 31 may be provided integrally with the condenser 30 in addition to the configuration shown in the drawing, and may be omitted when the amount of circulating working medium is small. In the following description, the condenser 30 includes the buffer tank 31, and the buffer tank 31 includes the condenser 30. The check valves 36 and 66 may be automatic valves.

  On the other hand, the pipe 25 on the upstream side of the condenser 30, that is, the upper portion of the supply tank 60 is connected by a pipe 26 provided with an automatic valve 27, and the pipe 15 on the downstream side of the steam generator 10, that is, the high-pressure system. The upper part (pipe 26) of the liquid supply tank 60 is connected by a pipe 16 provided with an automatic valve 17. By opening the automatic valve 27, the pressure in the low pressure system and the liquid supply tank 60 can be equalized, and by opening the automatic valve 17, the pressure in the high pressure system and the liquid supply tank 60 can be equalized.

  In the steam generator 10, the buffer tank 31, and the liquid supply tank 60, a liquid level gauge 12, a liquid level gauge 33, and a liquid level gauge 62 that measure the liquid level of the working medium liquid staying inside are installed. The liquid level gauge 12 is installed to detect the emptying of the steam generator 10, and the liquid level gauge 33 is installed to detect a poor circulation of the working medium. These liquid level gauges 12 and liquid level gauges 33 are installed to confirm the safety of the power generation device, and can be omitted according to convenience.

  Next, the flow of the working medium liquid during operation of the power generator will be described. During the operation of the power generator, the automatic valve 27 is normally open and the automatic valve 17 is normally closed. As a result, the pressures in the condenser 30 and the liquid supply tank 60 become equal, and the working medium liquid 32 in the condenser 30 is caused by the drop between the liquid level H in the condenser 30 and the liquid level Y in the liquid supply tank 60. Then, it moves into the liquid supply tank 60 through the pipe 35. When the liquid level gauge 62 detects that the liquid level Y of the working medium liquid 61 in the liquid supply tank 60 has reached a predetermined level or higher, the automatic valve 27 is closed for a certain time by a control means (not shown) and the automatic valve 17 is opened. As a result, the internal pressures of the liquid supply tank 60 and the steam generator 10 become equal, and the working medium liquid 61 in the liquid supply tank 60 has a liquid level Y in the liquid supply tank 60 and a liquid level L in the steam generator 10. Is sent to the steam generator 10 through the pipe 65.

  In this way, the working medium liquid 32 in the condenser 30 can be sent to the steam generator 10 via the supply liquid tank 60 without using a medium circulation pump or the like, so that the working medium liquid 32 is almost saturated. Even when it is a saturated liquid, it can be sent to the steam generator 10 in a stable state without being limited to NPSH or the like. Further, when the amount of heat of the exhaust heat 1 supplied to the steam generator 10 is changed, the circulation amount of the working medium circulating in the power generator, that is, the amount of the working medium liquid 32 discharged from the condenser 30 is changed. Even if there is a change, the interval at which the working medium liquid is fed changes depending on the amount of circulation. Therefore, the working medium liquid to be fed to the steam generator 10 is appropriately controlled without being particularly conscious of the amount of circulation of the working medium. Too much or too little can be prevented, and failure of the steam generator 10 and the expander 20 and the occurrence of an accident can be prevented.

Here, a comparison of the output of the power generation device according to the present invention and the power generation device that feeds the working medium liquid using the conventional liquid supply pump 50 shown in FIG. 1 will be considered. In the power generation device according to the present invention, the energy consumed to send the working medium liquid from the low pressure condenser 30 to the high pressure steam generator 10 is equal to the energy of the working medium vapor passing through the pipe 16 and the pipe 26. . This energy consumption rate can be approximated by the following equation.
Q ₁ = w × q × m ₂ / m ₁ (Formula 1)
Where Q ₁ : Energy consumption rate [W]
w: Flow rate of working medium [kg / sec]
q: Heat of vaporization of working medium [J / kg] (however, including sensible heat rise)
m _1, m ₂ : Specific weight of working medium liquid and working medium vapor [kg / m ³ ]

Since the energy consumption rate is affected by the amount of heat input to the power generator (the amount of heat such as exhaust heat 1 supplied to the steam generator 10), the energy consumption rate relative to the amount of exhaust heat becomes the output reduction rate. The output reduction rate is expressed by the following equation.
ξ ₁ = Q ₁ / (q × w) = m ₂ / m ₁ (Formula 2)
Where ξ ₁ : Output decrease rate

Next, consider a case where the working medium liquid is fed to the steam generator 10 using the liquid feed pump 50 in the conventional power generator shown in FIG. At this time, the energy consumed by the feed pump 50 is expressed by the following equation.
Q ₂ = (P ₁ −P ₂ ) × w / m ₁ / η _P (Formula 3)
However, Q ₂ : Pump energy consumption rate [W]
η _P : Pump efficiency [W / W]
P ₁ , P ₂ : Working medium liquid, working medium vapor pressure [Pa]

In this case, the consumed energy rate affects the recovered power, and the pump consumed energy rate with respect to the recovered power becomes the output reduction rate.
ξ ₂ = (P ₁ −P ₂ ) / η _P × w / m ₁ / (η _e × w × q)
= (P ₁ −P ₂ ) / (q × m ₁ × η _P × η _e ) (Formula 4)
However, ξ ₂ : Output decrease rate η _e : Power recovery efficiency

From this, the ratio of output reduction rate is
φ = ξ ₂ / ξ ₁ = (P ₁ −P ₂ ) / (q × m ₂ × η _P × η _e ) (Formula 5)
It becomes. When φ exceeds 1, it can be said that the power generator according to the present invention is more advantageous in terms of energy efficiency than the conventional power generator. In addition, even if energy efficiency is not necessarily advantageous, it can be said that the power generation apparatus according to the present invention is advantageous because it has advantages in terms of NPSH and the like as long as it is at least equivalent.

Here, using water and steam as the working medium, the high pressure steam pressure is 0.20 MPa (A), the low pressure steam pressure is 0.01 MPa (A), the heat of vaporization of water is 2500 kJ / kg, and the pump efficiency η _P is 80. %, When the power recovery efficiency η _e is 8%,
φ = ξ ₂ / ξ ₁ ≒ 1.1
Thus, the energy efficiency of the power generation device according to the present invention and that of the conventional power generation device are substantially equal. Also, using fluorinated alcohol (trifluoroethanol) as the working medium, high pressure steam pressure is 0.14 MPa (A), low pressure steam pressure is 0.04 MPa (A), pump efficiency η _P is 80%, power recovery efficiency When η _e is 4.6%,
φ = ξ ₂ / ξ ₁ ≒ 1.9
Therefore, the power generator according to the present invention is more advantageous. As a result of studying power generators that deliver working medium liquids by other methods, in general, in the case of power generators that recover heat from a relatively low-temperature heat source and use chlorofluorocarbon or alcohol as the working medium, the power generation according to the present invention It has been found that using an apparatus is advantageous in terms of energy efficiency.

  Thus, when recovering power from the low-temperature exhaust heat 1, the power generator according to the present invention can feed the working medium liquid in a stable state even if the working medium liquid is a saturated liquid. In addition to being able to follow the change in the amount of circulating water by itself, it has excellent characteristics such as being able to send liquid without consuming the collected power and having good energy efficiency. These are very important characteristics that should be provided for a small distributed power generation device (power recovery device).

  In the power generator according to the present invention, while the automatic valve 17 is opened and the steam generator 10 and the liquid supply tank 60 are pressure-equalized, high-temperature steam is introduced from the steam generator 10 into the liquid supply tank 60. Although this may result in heat loss, this problem can be solved by shortening the time for feeding the working medium liquid 61 in the liquid supply tank 60 to the steam generator 10 as much as possible.

  FIG. 3 is a schematic diagram illustrating a configuration example (Example 2) of a power generation device according to another embodiment of the present invention. In this power generator, a flow path switching valve (three-way switching valve) 74 is provided between the low pressure system and the high pressure system, one end of the low pressure system and the flow path switching valve 74 is connected by a pipe 71, and the high pressure system and the flow path are connected. The other end of the switching valve 74 is connected by a pipe 72, and the upper end of the liquid supply tank 60 and the other end of the flow path switching valve 74 are connected by a pipe 73. By the switching operation of the flow path switching valve 74, the internal pressure of the liquid supply tank 60 can be made the same as the high pressure system internal pressure or the low pressure system internal pressure. Thus, by the switching operation of the flow path switching valve 74, the working medium liquid accumulated in the condenser 30 can be sent to the steam generator as in the case of FIG.

  FIG. 4 is a schematic diagram illustrating a configuration example (Example 3) of a power generation device according to another embodiment of the present invention. This power generator is provided with two liquid supply tanks 75 and 80 and flow path switching valves (three-way switching valves) 98 and 99 between the low pressure system and the high pressure system. One end of the low pressure system and the flow path switching valve 98 are connected by a pipe 93, and the other end of the high pressure system and the flow path switching valve 98 are connected by a pipe 95. The other end is connected by a pipe 96. In addition, one end of the low pressure system and the flow path switching valve 99 are connected by a pipe 93, and the other end of the high pressure system and the flow path switching valve 99 are connected by a pipe 95 so that the upper portion of the liquid supply tank 80 and the flow path switching valve are connected. The other end of 99 is connected by a pipe 94. In the liquid supply tanks 75 and 80, the liquid levels Y 1 and Y 2 of the working medium liquids 76 and 81 staying in the liquid supply tanks 75 and 80, the liquid level H of the working medium liquid 32 staying in the condenser 30, and the steam generator 10. It is installed so that it may be located between the liquid level L of the working-medium liquid 11 which stagnates in.

  The bottom 31a of the buffer tank 31 and the bottoms 75a and 80a of the liquid supply tanks 75 and 80 are connected by pipes 85 and 86. The pipes 85 and 86 are connected to the liquid supply tanks 75 and 80 from the buffer tank 31. Check valves 87 and 88 are provided for flowing the working medium liquid. Further, the bottom portions 75a and 80a of the liquid supply tanks 75 and 80 and the bottom portion 10a of the steam generator 10 are communicated by pipes 89 and 90. The pipes 89 and 90 are connected to the steam generator 10 from the liquid supply tanks 75 and 80. Check valves 91 and 92 for flowing the working medium liquid are installed. The check valves 87 and 88 and the check valves 91 and 92 may be automatic valves.

  When the flow path switching valve 98 is opened to the low pressure system, the internal pressures of the condenser 30 and the liquid supply tank 75 are made equal, and when the flow path switching valve 98 is opened to the high pressure system, the liquid supply tank 75 and the steam generator 10 It also functions as an automatic valve that equalizes the internal pressure. Similarly, when the flow path switching valve 99 is opened to the low-pressure system, the internal pressures of the condenser 30 and the liquid supply tank 80 are equalized, and when opened, the liquid supply tank 80 is opened. And a function as an automatic valve that equalizes the internal pressure of the steam generator 10. Liquid level gauges 77 and 82 for measuring the liquid level of the internal working medium liquid are attached to the liquid supply tanks 75 and 80, respectively.

  In the power generator of the first or second embodiment, when the working medium liquid is sent to the steam generator 10, there is a problem that the temperature in the steam generator 10 decreases due to a decrease in temperature in the steam generator 10. Therefore, in the power generation apparatus of the third embodiment, two supply medium tanks 75 and 80 are provided, so that two liquid supply systems for the working medium liquid are installed in parallel. By continuously using the two liquid supply tanks 75 and 80 to continuously feed the working medium liquid from the condenser 30 to the steam generator 10, temperature fluctuations in the steam generator 10 can be reduced. Therefore, the safety of the power generator can be improved. In this embodiment, two liquid supply tanks are installed. However, the number of liquid supply tanks to be installed can be further increased.

  FIG. 5 is a schematic diagram illustrating a configuration example (Example 4) of a power generation device according to another embodiment of the present invention. This power generator is configured by installing a liquid supply tank 60 directly below (on the downstream side) of the condenser 30, connecting the condenser 30 and the liquid supply tank 60 through a pipe 100, and providing an automatic valve 101 in the pipe 100. is doing. The automatic valve 101 has a function of equalizing the internal pressures of the condenser 30 and the liquid supply tank 60 and a function of sending the working medium liquid from the condenser 30 to the liquid supply tank 60. When the automatic valve 101 is opened, the working medium liquid 32 in the condenser 30 flows down to the liquid supply tank 60 due to a position drop, and the vapor (gas) 63 in the liquid supply tank 60 moves to the condenser 30. The pressures in the condenser 30 and the liquid supply tank 60 become equal. If there is an appropriate drop between the liquid level height H of the working medium liquid 32 in the condenser 30 and the liquid level height Y of the working medium liquid 61 in the liquid supply tank 60, the pipe 100 has a sufficient thickness. By doing so, the fluid can be moved smoothly.

  FIG. 6 is a schematic diagram illustrating a configuration example (Example 5) of a power generation device according to another embodiment of the present invention. In this power generation device, a gas-liquid separator 13 is provided on the downstream side of the steam generator 10, and the working medium liquid separated by the gas-liquid separator 13 is returned to the steam generator 10 by the working medium recirculation pump 14. The piping 65 is communicated with the suction port of the working medium recirculation pump 14. With this configuration, the temperature of the working medium liquid flowing from the suction port of the working medium recirculation pump 14 is lowered, so that NPSH increases and troubles such as a failure of the working medium recirculation pump 14 are reduced. It becomes possible. Further, the high-pressure working medium vapor from which the liquid component has been removed can be introduced into the turbine 20.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are achieved. For example, the gas-liquid separator 13 and the working medium recirculation pump 14 provided in the power generation device according to the fifth embodiment can be provided in any one of the power generation devices according to the first to fourth embodiments.

It is a figure which shows the example of schematic structure of the conventional power recovery device. It is a figure which shows the example of schematic structure of the electric power generating apparatus which is the embodiment example (Example 1) of the power recovery device concerning this invention. It is a figure which shows the example of schematic structure of the electric power generating apparatus which is the embodiment example (Example 2) of the power recovery device concerning this invention. It is a figure which shows the example of schematic structure of the electric power generating apparatus which is the embodiment example (Example 3) of the power recovery device concerning this invention. It is a figure which shows the example of schematic structure of the electric power generating apparatus which is the embodiment example (Example 4) of the power recovery device concerning this invention. It is a figure which shows the example of schematic structure of the electric power generating apparatus which is the embodiment example (Example 5) of the power recovery device concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste heat 10 Steam generator 10a Bottom part 11 Working medium liquid 12 Level gauge 13 Gas-liquid separator 14 Working medium recirculation pump 15 Piping 16 Piping 17 Automatic valve 20 Expander (turbine)
25 Pipe 26 Pipe 27 Automatic valve 30 Condenser 31 Buffer tank 31a Bottom 32 Working medium liquid 33 Level gauge 35 Pipe 36 Check valve 60 Tank 60a Bottom 60b Top 61 Working medium liquid 62 Level gauge 63 Steam 65 Pipe 66 Check Valve 71 Pipe 72 Pipe 73 Pipe 74 Flow path switching valve 75 Tank 75a Bottom 75b Top 76 Working medium liquid 77 Level gauge 80 Tank 80a Bottom 80b Top 85 Pipe 86 Pipe 87 Check valve 88 Check valve 89 Pipe 90 Pipe 91 Reverse Stop valve 92 Check valve 93 Pipe 94 Pipe 95 Pipe 96 Pipe 98 Flow path switching valve 99 Flow path switching valve 100 Pipe 101 Automatic valve

Claims (3)

In a power recovery apparatus comprising a steam generator that recovers exhaust heat or the like to generate high-pressure steam of a working medium, an expander that expands the high-pressure steam, and a condenser that condenses the expanded steam,
Lower than the working medium liquid level of the condenser between the high pressure system including the steam generator connected to the inlet of the expander and the low pressure system including the condenser connected to the outlet of the expander One or more liquid tanks at a position higher than the liquid level of the working medium liquid of the steam generator,
A pipe is connected between the condenser and the liquid supply tank via an automatic valve or a check valve so that a working medium liquid flows from the condenser to the liquid supply tank,
A pipe is connected between the liquid supply tank and the steam generator via an automatic valve or a check valve so that the working medium liquid flows from the liquid supply tank to the steam generator.
The liquid supply tank and the high pressure system are connected by a high pressure system pressure equalizing pipe having an automatic valve and the liquid supply tank and the low pressure system are connected by a low pressure system pressure equalizing pipe having an automatic valve, or the liquid supply A power recovery apparatus, wherein a tank and the high-pressure system and the low-pressure system are connected via a switching valve that can be switched. The power recovery device according to claim 1,
A gas-liquid separator is provided downstream of the steam generator, and the working medium liquid separated by the gas-liquid separator is returned to the steam generator by a working medium recirculation pump. A power recovery apparatus, wherein a suction port of a circulation pump and the liquid supply tank are connected by piping through an automatic valve or a check valve. An operation method of a power recovery apparatus comprising: a steam generator that recovers exhaust heat or the like to generate high-pressure steam as a working medium; an expander that expands the high-pressure steam; and a condenser that condenses the expanded steam. There,
Between the high-pressure system including the steam generator connected to the inlet of the expander and the low-pressure system including the condenser connected to the outlet of the expander than the working medium liquid level of the condenser At a low position, a liquid supply tank is provided at a position higher than the working medium liquid level of the steam generator,
The working medium liquid of the condenser is sent to the liquid supply tank by a drop between the liquid level of the working medium liquid of the condenser and the liquid level of the working medium liquid of the liquid supply tank. When the liquid level reaches a predetermined level, the working medium liquid in the liquid supply tank is sent to the steam generator due to the difference between the liquid level of the working medium liquid in the liquid supply tank and the liquid level of the working medium liquid in the steam generator. An operation method of a power recovery apparatus, characterized by being liquefied.

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