JP2018141564A - Waste heat absorption refrigeration system and absorption chiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb waste heat by reducing the possibility of an abnormal stop state of a power generation device and to more smoothly return to the rated operation while suppressing the power consumption required for avoiding the abnormal stop state. A type refrigeration system and an absorption chiller are provided. SOLUTION: The waste heat utilization absorption chilling system 1 raises the temperature of the heat source water by using the cooling water which has been heated by cooling the power generation device 10, and uses the heat source water to raise the temperature of the absorption chiller 20. The dilute solution is heated in the regenerator 21. The absorption chiller 20 includes a concentrated solution bypass tube 27 that guides the concentrated solution obtained by heating in the regenerator 21 to the absorber 24 without spraying it on the absorption heat transfer tube 24a, and the control panel 29 has a temperature in the operating state. The opening degree of the control valve 28 is adjusted according to the temperature of the liquid to be cooled detected by the sensor T, and the ratio of the concentrated solution flowing through the concentrated solution bypass pipe 27 and the concentrated solution flowing through the concentrated solution bypass pipe 27 is determined. By controlling, the absorption capacity of the absorber 24 is controlled. [Selection diagram] Fig. 1

Description

  The present invention relates to a waste heat utilization absorption refrigeration system and an absorption chiller.

  2. Description of the Related Art Conventionally, an absorption refrigeration system using waste heat has been proposed that includes a power generation device that generates power and an absorption refrigerator that uses waste heat of the power generation device for heating a dilute solution in a regenerator. Here, the power generation device is planned so that the power generation load is relatively constant. On the other hand, the absorption refrigerator is operated according to the load. For this reason, when the load of the absorption refrigerator is small, it is not necessary to use all of the waste heat from the power generator. Therefore, a system described in Patent Document 1 has been proposed.

  In the system described in Patent Literature 1, when the load of the absorption refrigerator is reduced, the absorption liquid of the absorber is supplied to the evaporator together with the refrigerant, and the cooling temperature is reduced by increasing the evaporation temperature, thereby reducing the load. I am trying to drive.

Japanese Patent No. 3851664

  However, in the waste heat utilization absorption refrigeration system described in Patent Document 1, since the absorption liquid is supplied to the evaporator, the amount of the absorption liquid regenerated in the regenerator is greatly reduced. A large reduction in the amount of heat required for heating will be caused. For this reason, in the waste heat utilization absorption refrigeration system described in Patent Document 1, if the above operation is continued, there is a possibility that an abnormal stop state of the power generation apparatus is caused.

  In order to avoid the abnormal stop state described above, the pump must be operated excessively in order to increase the amount of absorbing liquid returned to the regenerator or increase the amount of cooling water flowing through the absorber or condenser. If forced, power consumption will increase.

  Furthermore, the waste heat utilization absorption refrigeration system described in Patent Document 1 is in a state where liquid refrigerant is accumulated in the lower part of the evaporator, and this is again sprayed onto the heat transfer tubes of the evaporator by a pump. ing. For this reason, if the load is reduced and the absorption liquid is fed into the evaporator, the absorption liquid will be mixed into the liquid refrigerant that has accumulated. It takes time to discharge from the evaporator, and the rated operation state cannot be immediately obtained.

  The present invention has been made to solve such a conventional problem, and the object of the present invention is to reduce the possibility of an abnormally stopped state of the power generation apparatus and to consume power required to avoid the abnormally stopped state. An object of the present invention is to provide an absorption refrigeration system and an absorption refrigeration system utilizing waste heat that can smoothly return to the rated operation while suppressing the amount.

  The present invention includes a second path that guides the concentrated solution obtained by heating in the regenerator to the absorber without being sprayed on the absorption heat transfer tube, and controls the control valve according to the temperature of the liquid to be cooled sent out from the evaporation heat transfer tube. The absorbent capacity of the refrigerant vapor in the absorber is controlled by adjusting the opening degree and controlling the ratio of the concentrated solution flowing through the first path and the second path.

  According to the present invention, for example, when the load on the absorption refrigerator side is reduced and the change in the load is detected as the temperature change of the liquid to be cooled, the amount of concentrated solution reaching the absorber through the second path is reduced. By increasing and decreasing the amount of concentrated solution sprayed on the absorption heat transfer tube of the absorber, the absorption capacity of the absorber can be reduced, and evaporation in the evaporator can also be suppressed. And by suppressing evaporation, it becomes difficult to cool the liquid to be cooled flowing through the evaporation heat transfer tube in the evaporator, and a low-load operation can be performed. In addition, since the concentrated solution that has reached the absorber through the second path is returned to the regenerator, the amount of absorbing liquid regenerated in the regenerator is maintained, and a large decrease in the amount of heat required for heating the regenerator is suppressed. It becomes. As a result, there is no need to take measures to increase the amount of power consumption such as increasing the amount of absorbing liquid returned to the regenerator or increasing the amount of cooling water flowing through the absorber or condenser. Can be prevented from being abnormally stopped.

  In addition, since the absorption liquid is not sprayed by the evaporator, even if a circulation type configuration in which the liquid refrigerant is circulated in the evaporator is adopted, the absorption liquid is removed from the liquid refrigerant when returning to the rated operation. It can also be prevented that it takes too much time to discharge.

  Therefore, it is possible to return to the rated operation more smoothly while reducing the possibility of the abnormal stop state of the power generator and suppressing the power consumption required to avoid the abnormal stop state.

  ADVANTAGE OF THE INVENTION According to this invention, the possibility of the abnormal stop state of a power generator can be reduced, and it can return to rated operation more smoothly, suppressing the power consumption required for avoiding an abnormal stop state.

It is a schematic block diagram of the waste heat utilization absorption refrigeration system which concerns on embodiment of this invention. It is a flowchart which shows the process of the control panel of the waste heat utilization absorption refrigeration system which concerns on this embodiment.

  Hereinafter, the present invention will be described according to preferred embodiments. Note that the present invention is not limited to the embodiments described below, and can be appropriately changed without departing from the spirit of the present invention. Further, in the embodiment described below, there is a part where illustration or description of a part of the configuration is omitted, but details of the omitted technology are within a range in which there is no contradiction with the contents described below. Needless to say, known or well-known techniques are applied as appropriate.

  FIG. 1 is a schematic configuration diagram of a waste heat utilization absorption refrigeration system according to an embodiment of the present invention. As shown in FIG. 1, the waste heat utilization absorption refrigeration system 1 according to this embodiment includes a power generation device 10, an absorption refrigeration machine 20, and a connection device 30.

  The power generation device 10 performs power generation, and is configured by, for example, a device in which an engine 11 and a generator 12 are combined. In the power generation apparatus 10, the engine 11 operates to operate the generator 12 to generate power. The engine 11 is a water-cooled type cooled by water (liquid), and the heat generated by the engine 11 is removed by the cooling water. In the present embodiment, the power generation device 10 is not limited to a device in which the engine 11 and the generator 12 are combined, and may be another power generation device such as a fuel cell as long as it is a water-cooled type.

  The absorption refrigerator 20 includes a regenerator 21, a condenser 22, an evaporator 23, and an absorber 24, and cools a cooling target liquid that flows through the evaporation heat transfer tube 23 a in the evaporator 23 by a circulation cycle using these. . Further, the absorption chiller 20 includes a first to third pumps P1 to P3, a cooling tower CT, a cooling target liquid pipe 23b, a cooling target liquid return pipe 23c, and a concentrated solution pipe (first path) 25. And a heat exchanger 26. Hereinafter, the absorption refrigerator 20 will be described in detail.

  The regenerator 21 includes, for example, water serving as a refrigerant (hereinafter, the refrigerant vaporized is referred to as refrigerant vapor, and the refrigerant liquefied is referred to as liquid refrigerant) and lithium bromide (LiBr) serving as an absorption liquid. The mixed dilute solution (solution having a low concentration of the absorbing solution) is heated. The regenerator 21 releases refrigerant vapor from the dilute solution by this heating, and generates refrigerant vapor and a concentrated solution (a solution having a high concentration of the absorbing solution).

  The condenser 22 liquefies the refrigerant vapor supplied from the regenerator 21. A condensing heat transfer tube 22 a is inserted into the condenser 22. Cooling water (cooling liquid) is supplied from the cooling tower CT to the condensing heat transfer tube 22a by the power of the first pump P1, and the evaporated refrigerant vapor is cooled and liquefied by the cooling water in the condensing heat transfer tube 22a. Further, the liquid refrigerant liquefied by the condenser 22 is supplied to the evaporator 23.

  The evaporator 23 evaporates the liquid refrigerant. An evaporation heat transfer tube 23 a is provided in the evaporator 23. The evaporative heat transfer pipe 23a is connected to, for example, the indoor unit IU via a cooling target liquid-bound pipe 23b and a cooling target liquid return pipe 23c, and the cooling target liquid heated by the cooling by the indoor unit IU is supplied to the second pump Supplied by P2 power. Further, the inside of the evaporator 23 is in a substantially vacuum state. For this reason, the evaporation temperature of water as a refrigerant is about 5 ° C. Therefore, the liquid refrigerant spread on the evaporation heat transfer tube 23a evaporates depending on the temperature of the evaporation heat transfer tube 23a. Further, the temperature of the liquid to be cooled in the evaporation heat transfer tube 23a is deprived of the temperature by evaporation of the liquid refrigerant. As a result, the liquid to be cooled in the evaporation heat transfer tube 23a is cooled and supplied to the indoor unit IU, and the indoor unit IU supplies cold air to the room using the cooled liquid to be cooled.

  The absorber 24 absorbs the refrigerant evaporated in the evaporator 23. A concentrated solution from the regenerator 21 is supplied into the absorber 24 through a concentrated solution pipe 25. Further, an absorption heat transfer tube 24 a is inserted into the absorber 24. The concentrated solution that reaches the regenerator 21 through the concentrated solution pipe 25 is sprayed on the absorption heat transfer tube 24a. As a result, the refrigerant vapor evaporated in the evaporator 23 is absorbed by the concentrated solution on the surface of the absorption heat transfer tube 24a, and a diluted solution is generated. Further, the cooling water from the cooling tower CT flows through the absorption heat transfer tube 24a, and the absorption heat generated by the absorption of the concentrated solution refrigerant vapor is removed by the cooling water of the absorption heat transfer tube 24a. The absorption heat transfer tube 24a is connected to the condensation heat transfer tube 22a.

  Moreover, in this embodiment, the lower part of the evaporator 23 and the absorber 24 is connecting. For this reason, the dilute solution whose concentration has decreased due to the absorption of the refrigerant in the absorber 24 and the liquid refrigerant that could not be evaporated in the evaporator 23 are supplied to the regenerator 21 by the third pump P3.

  Furthermore, the heat exchanger 26 exchanges heat between the diluted solution and liquid refrigerant supplied to the regenerator 21 by the third pump P3 and the concentrated solution supplied from the regenerator 21 to the absorber 24 by the concentrated solution pipe 25. Do.

  The connection device 30 thermally connects the power generator 10 and the absorption chiller 20, and includes an engine cooling pipe 31, a heat source water supply pipe 32, and a heat exchanger 33. The engine cooling pipe 31 is a pipe through which cooling water for cooling the engine 11 flows. The heat source water supply pipe 32 is a pipe that supplies heat source water to the regenerator 21 of the absorption chiller 20. The heat exchanger 33 introduces cooling water that has cooled the engine 11 and raised its temperature, and supplies the heat of the cooling water to the heat source water of the heat source water supply pipe 32. With such a configuration, the waste heat of the engine 11 is used for heating the dilute solution in the regenerator 21 of the absorption refrigerator 20.

  Further, the connection device 30 includes a fourth pump P4 and a first three-way valve V1. The fourth pump P <b> 4 is provided in the heat source water supply pipe 32 a in the heat source water supply pipe 32 and serves as a power source for supplying the heat source water to the regenerator 21. The first three-way valve V <b> 1 is provided in the heat source water return pipe 32 b in the heat source water supply pipe 32. The first three-way valve V1 passes through a route for supplying the heat source water returning from the regenerator 21 to the heat exchanger 33, and a bypass pipe 32c connected to the downstream side of the fourth pump P4 in the heat source water pipe 32a. The route for returning the heat source water to the heat exchanger 33 is selectable.

  The waste heat utilization absorption refrigeration system 1 according to the present embodiment includes a second three-way valve V2 and a radiator R. The engine cooling pipe 31 includes a cooling water pipe 31a and a cooling water return pipe 31b, and the second three-way valve V2 is provided on the cooling water return pipe 31b and returns from the heat exchanger 33. Is configured to be selectable between a route for supplying the engine to the radiator R and a route for returning to the engine 11.

  Here, the first and second three-way valves V <b> 1 and V <b> 2 and the radiator R are used, for example, during maintenance of the absorption refrigerator 20. During maintenance, the waste heat of the engine 11 cannot be supplied to the absorption refrigerator 20. Therefore, the first three-way valve V1 selects a route for returning the heat source water discharged from the heat exchanger 33 to the heat exchanger 33 again via the bypass pipe 32c (normally, the other route is selected). In addition, the second three-way valve V2 selects a route for supplying cooling water to the radiator R (normally, the other route is selected). As a result, the absorption refrigerator 20 can be maintained while avoiding an abnormal stop of the engine 11. Note that these configurations may be used other than during maintenance.

  Here, in the waste heat utilization absorption refrigeration system 1 according to the present embodiment, the power generation device 10 is planned so that the power generation load is relatively constant. On the other hand, the absorption refrigerator 20 is operated according to the magnitude of the load. For this reason, when the load of the absorption refrigerator 20 is small, it is not necessary to use all of the waste heat from the power generation apparatus 10. On the other hand, the waste heat utilization absorption refrigeration system 1 according to the present embodiment further includes a concentrated solution bypass pipe (second path) 27, a control valve 28, a temperature sensor (temperature detection means) T, and a control panel (absorption). (Force control means) 29 is provided to control the absorption power of the absorption refrigeration machine 20 and supply the absorption refrigeration machine 20 according to the load while supplying substantially the entire amount of waste heat to the absorption refrigeration machine 20. I try to do it. At this time, in the present embodiment, it is basically unnecessary to use the radiator R. Hereinafter, this point will be described.

  The concentrated solution bypass pipe 27 is a pipe having one end connected to the downstream side of the heat exchanger 26 in the concentrated solution pipe 25 and the other end positioned below the absorption heat transfer pipe 24 a in the absorber 24. That is, the concentrated solution that reaches the absorber 24 through the concentrated solution bypass pipe 27 is returned to the regenerator 21 by the third pump P3 without being sprayed to the absorption heat transfer pipe 24a.

  The control valve 28 is a valve provided on the concentrated solution bypass pipe 27 and capable of adjusting the opening degree. Here, when the control valve 28 is fully opened (opening degree 100%), all of the concentrated solution from the regenerator 21 reaches the absorber 24 through the concentrated solution bypass pipe 27. On the other hand, when the control valve 28 is in a fully closed state (opening degree 0%), all of the concentrated solution from the regenerator 21 is spread from the upper part of the absorber 24 to the absorption heat transfer tube 24a without passing through the concentrated solution bypass tube 27. Will be. Further, when the opening degree of the control valve 28 becomes 50%, the concentrated solution reaches the absorber 24 through both paths one by one. In this manner, the control valve 28 functions as a regulator for adjusting the ratio of the concentrated solution flowing through both paths.

  The temperature sensor T is provided on the cooling target liquid-directed pipe 23b and detects the temperature of the cooling target liquid sent from the evaporation heat transfer pipe 23a in the evaporator 23 to the indoor unit IU. The control panel 29 controls the entire absorption refrigerator 20. In particular, in the present embodiment, the control panel 29 adjusts the opening degree of the control valve 28 according to the temperature detected by the temperature sensor T in the operating state of the absorption refrigerator 20. Thereby, the control panel 29 controls the ratio of the concentrated solution that reaches the absorber 24 without going through the concentrated solution bypass pipe 27 and the concentrated solution that reaches the absorber 24 through the concentrated solution bypass pipe 27. The absorption capacity of the refrigerant vapor will be controlled. Here, the concentrated solution absorbs the refrigerant vapor on the surface of the absorption heat transfer tube 24a. For this reason, by increasing the amount of the concentrated solution that reaches the absorber 24 via the concentrated solution bypass pipe 27, the absorption power of the absorber 24 can be reduced, and evaporation in the evaporator 23 can also be suppressed. Thereby, it is difficult to reduce the temperature of the liquid to be cooled, and a low-load operation can be performed.

  Specifically, the control panel 29 adjusts the opening of the control valve 28 and flows through the concentrated solution bypass pipe 27 when the temperature of the cooling target liquid detected by the temperature sensor T is equal to or lower than the first predetermined temperature. The amount of water is controlled so as to increase, and the absorption capacity is reduced. On the other hand, when the temperature of the liquid to be cooled detected by the temperature sensor T is equal to or higher than the second predetermined temperature (a temperature equal to or higher than the first predetermined temperature), the control panel 29 adjusts the opening of the control valve 28 and absorbs it. The amount of concentrated solution sprayed on the heat transfer tube 24a is controlled to increase, thereby increasing the absorption capacity. As a result, while keeping the temperature of the liquid to be cooled constant, the absorptive power is changed to perform low load operation, rated operation, and the like.

  In particular, in the present embodiment, unlike in Patent Document 1, the amount of absorbing liquid returned to the regenerator 21 does not decrease, so the amount of absorbing liquid regenerated by the regenerator 21 is maintained, and the regenerator 21 Therefore, a large decrease in the amount of heat required for heating is suppressed. Thereby, it can avoid that the electric power generating apparatus 10 will be in an abnormal stop state.

  In addition, since the amount of the absorbing liquid regenerated by the regenerator 21 is maintained, it is not necessary to take measures for increasing the power consumption such as increasing the amount of the absorbing liquid returned to the regenerator 21. Further, there is no need to take means for increasing the circulation amount of the cooling water.

  Next, the operation of the waste heat utilization absorption refrigeration system 1 according to the present embodiment will be described. FIG. 2 is a flowchart showing processing of the control panel 29 of the waste heat utilization absorption refrigeration system 1 according to the present embodiment. Note that the process shown in FIG. 2 is repeatedly executed until the power supply of the absorption refrigerator 20 is turned off.

  As shown in FIG. 2, the control panel 29 detects the temperature of the liquid to be cooled sent from the evaporation heat transfer tube 23a to the indoor unit IU based on the signal from the temperature sensor T (S1). Next, the control panel 29 determines whether the temperature of the liquid to be cooled detected in step S1 is equal to or lower than a first predetermined temperature (S2).

  When it is determined that the temperature of the liquid to be cooled is equal to or lower than the first predetermined temperature (S2: YES), the control panel 29 increases the opening of the control valve 28 by a predetermined amount (S3). Thereby, the control panel 29 increases the amount of the concentrated solution supplied to the absorber 24 without being sprayed on the absorption heat transfer tube 24a, and decreases the absorption power of the absorber 24. Then, the process shown in FIG.

  On the other hand, when it is determined that the temperature of the cooling target liquid is not equal to or lower than the first predetermined temperature (S2: NO), the control panel 29 determines whether the temperature of the cooling target liquid detected in step S1 is equal to or higher than the second predetermined temperature. (S4). When it is determined that the temperature of the liquid to be cooled is not equal to or higher than the second predetermined temperature (S4: NO), the process illustrated in FIG.

  On the other hand, when it is determined that the temperature of the cooling target liquid is equal to or higher than the second predetermined temperature (S4: YES), the control panel 29 decreases the opening of the control valve 28 by a predetermined amount (S5). Thereby, the control panel 29 increases the amount of the concentrated solution sprayed on the absorption heat transfer tube 24 a and increases the absorption power of the absorber 24. Then, the process shown in FIG.

  Thus, according to the waste heat utilization absorption refrigeration system 1 and the absorption refrigeration machine 20 according to the present embodiment, the concentrated solution obtained by heating in the regenerator 21 is absorbed without being sprayed on the absorption heat transfer tubes 24a. A concentrated solution bypass pipe 27 that leads to the vessel 24, adjusts the opening degree of the control valve 28 according to the temperature of the liquid to be cooled, and flows through the concentrated solution bypass pipe 27 and the concentrated solution bypass pipe 27. By controlling the ratio of the flowing concentrated solution, the absorption capacity of the refrigerant vapor in the absorber 24 is controlled.

  For this reason, for example, when the load on the absorption refrigerator 20 side is reduced and the change in the load is detected as a temperature change in the liquid to be cooled, the amount of the concentrated solution that reaches the absorber 24 through the concentrated solution bypass pipe 27 By reducing the amount of concentrated solution sprayed on the absorption heat transfer tube 24a of the absorber 24, the absorption power of the absorber 24 can be reduced, and evaporation in the evaporator 23 can also be suppressed. And by suppressing evaporation, the liquid to be cooled flowing through the evaporation heat transfer tube 23a in the evaporator 23 becomes difficult to be cooled, and a low-load operation can be performed. In addition, since the concentrated solution that has reached the absorber 24 through the concentrated solution bypass pipe 27 is returned to the regenerator 21, the amount of the absorption liquid regenerated in the regenerator 21 is maintained, and the amount of heat required for heating the regenerator 21. This will suppress a large drop in the. This eliminates the need to take measures to increase the amount of power consumption, such as increasing the amount of absorbing liquid returned to the regenerator 21 or increasing the amount of cooling water flowing through the absorber 24 or the condenser 22. Thus, it is possible to avoid the power generation device 10 from being in an abnormally stopped state.

  Further, since the absorbing liquid is not sprayed by the evaporator 23, even if a circulation type configuration in which the liquid refrigerant is circulated in the evaporator 23 is adopted, it is absorbed from the liquid refrigerant when returning to the rated operation. It can also be prevented that it takes too much time to discharge the liquid.

  Therefore, it is possible to smoothly return to the rated operation while reducing the possibility of the abnormal stop state of the power generation apparatus 10 and suppressing the power consumption required to avoid the abnormal stop state.

  Further, when the temperature of the liquid to be cooled is equal to or lower than the first predetermined temperature, the evaporator 24 is controlled so that the amount of the concentrated solution flowing through the concentrated solution bypass pipe 27 is increased to reduce the absorbing power of the absorber 24. The evaporation in 23 is suppressed, and the temperature of the liquid to be cooled is increased. On the other hand, when the temperature of the liquid to be cooled is equal to or higher than the second predetermined temperature, the amount of the concentrated solution that does not pass through the concentrated solution bypass pipe 27 is controlled so as to increase the absorption capacity of the absorber 24. The evaporation in the vessel 23 is increased and the temperature of the liquid to be cooled is lowered. In this way, it is possible to perform a low load operation and a rated operation while keeping the temperature of the liquid to be cooled constant.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above-described embodiments, and may be modified without departing from the spirit of the present invention, and may be appropriately changed within a possible range. These techniques may be combined.

  For example, the waste heat utilization absorption refrigeration system 1 according to the present embodiment exchanges heat between the cooling water of the engine 11 and the heat source water, but is not limited thereto, and further exchanges heat between the exhaust gas from the engine 11 and the heat source water. You may do it.

  Furthermore, in the said embodiment, if the function of the absorption refrigerator 20 is provided, you may use an absorption chiller / heater.

1: Absorption refrigeration system using waste heat 10: Power generation device 11: Engine 12: Generator 20: Absorption refrigeration machine 21: Regenerator 22: Condenser 22a: Condensation heat transfer tube 23: Evaporator 23a: Evaporation heat transfer tube 23b: Cooling target liquid pipe 23c: Cooling target liquid return pipe 24: Absorber 24a: Absorption heat transfer pipe 25: Concentrated solution pipe (first path)
26: Heat exchanger 27: Concentrated solution bypass pipe (second path)
28: Control valve 29: Control panel (absorbing force control means)
30: Connection device 31: Engine cooling pipe 31a: Cooling water pipe 31b: Cooling water return pipe 32: Heat source water supply pipe 32a: Heat source water pipe 32b: Heat source water return pipe 32c: Bypass pipe 33: Heat exchanger CT: Cooling tower IU: Indoor units P1 to P4: Pump R: Radiator T: Temperature sensor (temperature detection means)
V1, V2: Three-way valve

Claims (3)

A power generation device that generates power and is cooled by liquid; and an absorption refrigerator that cools a liquid to be cooled that flows through an evaporation heat transfer tube in the evaporator by a circulation cycle of a regenerator, a condenser, an evaporator, and an absorber; A waste heat utilization absorption refrigeration system that heats a dilute solution in the regenerator using a liquid whose temperature has been raised by cooling the power generation device,
The absorption refrigerator is
A first path for guiding the concentrated solution obtained by heating in the regenerator to the absorber and spraying the concentrated solution in the absorber through which the cooling liquid flows;
A second path for guiding the concentrated solution obtained by heating in the regenerator to the absorber without spraying the absorption heat transfer tube;
Temperature detecting means for detecting the temperature of the liquid to be cooled sent from the evaporation heat transfer tube in the evaporator;
A control valve for adjusting the ratio of the concentrated solution flowing through the first path and the second path;
In the operation state in which the dilute solution is heated in the regenerator, the opening degree of the control valve is adjusted according to the temperature of the liquid to be cooled detected by the temperature detection means, and the first path and the second path An absorptive power control means for controlling the absorptive power of the refrigerant vapor in the absorber by controlling the ratio of the concentrated solution flowing through
A waste heat utilization absorption refrigeration system comprising: The absorptive power control means adjusts the degree of opening of the control valve when the temperature of the cooling target liquid detected by the temperature detection means is equal to or lower than a first predetermined temperature, and controls the concentration of the concentrated solution flowing through the second path. The control valve is configured to reduce the absorption capacity by controlling the amount to increase, and when the temperature of the liquid to be cooled detected by the temperature detecting means is equal to or higher than a second predetermined temperature that is equal to or higher than the first predetermined temperature. 2. The waste heat utilization absorption refrigeration system according to claim 1, wherein the amount of concentrated solution flowing through the first path is adjusted to increase the absorption capacity by adjusting the opening degree of the waste heat. Absorption that cools the liquid to be cooled that flows through the evaporation heat transfer tube in the evaporator by the circulation cycle of the regenerator, the condenser, the evaporator, and the absorber, and heats the diluted solution in the regenerator by using heat source water. Type refrigerator,
A first path for guiding the concentrated solution obtained by heating in the regenerator to the absorber and spraying the concentrated solution in the absorber through which the cooling liquid flows;
A second path for guiding the concentrated solution obtained by heating in the regenerator to the absorber without spraying the absorption heat transfer tube;
Temperature detecting means for detecting the temperature of the liquid to be cooled sent from the evaporation heat transfer tube in the evaporator;
A control valve for adjusting the ratio of the concentrated solution flowing through the first path and the second path;
In the operation state in which the dilute solution is heated in the regenerator, the opening degree of the control valve is adjusted according to the temperature of the liquid to be cooled detected by the temperature detection means, and the first path and the second path An absorptive power control means for controlling the absorptive power of the refrigerant vapor in the absorber by controlling the ratio of the concentrated solution flowing through
An absorption refrigerator comprising:

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