JP5457163B2 - Control method and apparatus for absorption chiller / heater using exhaust gas of distributed power generation system - Google Patents

Description

  The present invention relates to a control method and apparatus for an absorption chiller / heater using exhaust gas from a distributed power generation system. Specifically, an exhaust gas heat exchanger and an exhaust gas damper are added to an exhaust hot water charging type absorption chiller / heater having an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution heat exchanger, a waste heat water heat exchanger, and the like. In a flue gas / waste water injection type absorption chiller / heater that uses the exhaust heat exhausted from the distributed power generation system more sophisticatedly, the solution pump idles after the dilution operation ends, and the exhaust gas damper malfunctions and seals deteriorate Method of solving the problems of dilution operation impossible due to leakage of exhaust gas caused by, etc., solution crystallization, abnormal overheating of exhaust gas heat exchanger, reducing the occurrence rate of failure and improving maintenance safety And an apparatus.

Distributed power generation systems (devices) are often used as customer power sales and ESCO businesses, and as a standby power source for emergency power outages. It is desirable to avoid this as far as possible. For that purpose, even when there is a leak of exhaust gas, stable quality as an absorption chiller / heater must be maintained, and measures must be taken.
Conventionally, no drastic countermeasures have been taken when exhaust gas leaks, and it is assumed that the absorption chiller / heater may eventually be damaged or the distributed power generator must be stopped.

  Conventionally, an absorption chiller / heater as illustrated in FIG. 3 is known. This absorption chiller / heater constitutes a reverse cycle in which an absorbing liquid (for example, an aqueous solution of lithium bromide) flows from the absorber 10 through the low temperature regenerator 14 to the high temperature regenerator 18. The absorption cycle in this absorption chiller / heater will be explained. First, an absorption liquid (dilute absorption liquid) whose concentration has been reduced by absorbing a large amount of refrigerant vapor in the absorber 10 is sent from the absorber 10 to the low-temperature heat exchanger 12. After being heated by the low temperature heat exchanger 12, it is fed to the low temperature regenerator 14. The dilute absorption liquid is regenerated at a low temperature in the low temperature regenerator 14, and a part of the absorbed refrigerant is released, and the concentration is increased by that amount to become an intermediate concentration absorption liquid (intermediate absorption liquid). Next, the intermediate absorbent is fed from the low temperature regenerator 14 to the high temperature heat exchanger 16, heated by the high temperature heat exchanger 16, and then fed to the high temperature regenerator 18.

  The intermediate absorbing liquid is regenerated at a high temperature in the high temperature regenerator 18, and a part of the refrigerant (for example, water vapor) absorbed is discharged to further increase the concentration to become a high concentration absorbing liquid (concentrated absorbing liquid). . The concentrated absorbent is returned to the heating side of the high temperature heat exchanger 16 as a heating source for heating the intermediate absorbent, and further, the heating source for heating the rare absorbent on the heating side of the low temperature heat exchanger 12. Is returned to the absorber 10. The returned concentrated absorbing liquid is sprayed on the heat transfer pipe in the absorber 10 and again absorbs the refrigerant vapor while being cooled by the cooling water to become the diluted absorbing liquid. 32 is an absorption liquid pump, 34 is an absorption liquid pump (solution pump), 36 is a refrigerant pump, 38 is a cooling water pump, 40 is a cold / hot water pump, and 42 is a cooling / heating switching valve.

  In such an absorption chiller / heater, the high-temperature regenerator 18 is provided with a combustion unit 20, and the refrigerant absorbed by the heating of the intermediate absorption liquid is released. After being fed to the regenerator 14 and used as a heating source in the low temperature regenerator 14, it is returned to the condenser 22 and condensed. For example, in the case of cold water operation, the refrigerant liquid (for example, water) from the condenser 22 enters the evaporator 24, and the condensed refrigerant liquid is circulated by the refrigerant pump 36 through the heat transfer tube (water flows through the evaporator 24). ) And cooled by latent heat of evaporation to obtain cold water. Instead of providing the combustion section in the high temperature regenerator, steam (steam) or hot water generated from the boiler may be introduced into the high temperature regenerator. A bypass pipe 30 is provided to connect the absorption liquid pipe 26 from the low temperature regenerator 14 and the heating side absorption liquid pipe 28 between the high temperature heat exchanger 16 and the low temperature heat exchanger 12. A part of the intermediate concentrated absorbent that comes out and is supplied to the high-temperature regenerator 18 is bypassed to the concentrated absorbent pipe that returns to the absorber 10. Thus, what is shown in FIG. 3 is known as an example of the conventional absorption cold / hot water machine (for example, refer patent document 1).

JP 2002-39643 A (page 4, FIG. 2)

  The problem to be solved is the dilution caused by the exhaust of the exhaust gas due to the idling of the solution pump after the completion of the dilution operation, the malfunction of the exhaust gas damper, the deterioration of the sealing property, etc. It is in the point which the malfunction of abnormal heating of an operation impossible, solution crystallization, and an exhaust gas heat exchanger generate | occur | produces.

In the present invention, in order to avoid a failure risk when exhaust gas leaks, the exhaust gas heat exchanger is installed at a position higher than the overflow pipe of the low-temperature regenerator, and the liquid circulation cycle in which the solution returns to the total amount absorber when stopped. The most important feature is that the structure avoids crystallization of the solution when the exhaust gas leaks.
The present invention relates to an absorption chiller / heater installed on the upper side with respect to the solution liquid level of the primary and secondary devices connected to the exhaust gas heat exchanger by solution piping, and the exhaust gas heat recovery device while the absorption liquid pump is stopped. Absorption chiller / heater in which the total amount of the solution accumulated in the liquid flows down to the primary and secondary devices connected through the solution pipe by the position head, and in these cases, the absorption liquid pump is stopped while the absorption liquid pump is stopped. It is an object of the present invention to provide an absorption chiller / heater having an exhaust gas heat recovery device having a structure in which the accumulated solution flows down by the position head.

  The control method of the present invention includes an evaporator, an absorber, a condenser, a low-temperature regenerator, a high-temperature regenerator, a solution low-temperature heat exchanger, a solution high-temperature heat exchanger, and a waste hot water heat-absorbing type absorption cold temperature Install the exhaust gas heat exchanger and the exhaust gas damper on the water machine, and introduce the exhaust gas from the distributed power generation system into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. Control method for an absorption chiller / heater charged with exhaust gas / waste water, provided with an exhaust gas heat exchanger at a position higher than the overflow pipe of the solution in the low temperature regenerator, and the solution in the exhaust gas heat exchanger when the chiller / heater is stopped The total amount of the gas is returned to the absorber to avoid crystallization of the solution when the exhaust gas leaks in the exhaust gas heat exchanger.

  Further, the control method of the present invention includes an exhaust hot water charging type having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste water heat exchanger. The absorption chiller / heater is equipped with an exhaust gas heat exchanger and an exhaust gas damper, and the exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. A control method for an absorption chiller / heater charged with exhaust gas / waste hot water, and a solution pump for introducing a high-temperature heat exchanger by reverse flow of refrigerant vapor caused by a pressure difference between the high-temperature regenerator and the absorber after the dilution operation In order to prevent idling of the high-temperature regenerator, the dilution operation is continued until the saturation temperature of the refrigerant vapor in the high-temperature regenerator falls below a predetermined value, and in order to reduce the time for the dilution operation, Pump and It is characterized by operating the 却水 pump.

  Further, the control method of the present invention includes an exhaust hot water charging type having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste water heat exchanger. The absorption chiller / heater is equipped with an exhaust gas heat exchanger and an exhaust gas damper, and the exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. The exhaust gas / exhaust hot water input type absorption chiller / heater control method is as described above, and when there is an exhaust gas leak during dilution operation, the exhaust gas leak is detected by at least one of the limit switch of the exhaust gas damper and the exhaust gas temperature sensor. The refrigerant is mixed with the solution by controlling the automatic valve provided in the refrigerant blow pipe from the refrigerant tank of the evaporator, and the concentration of the solution is forcibly lowered to control the dilution. It is characterized in that.

  Further, the control method of the present invention includes an exhaust hot water charging type having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste water heat exchanger. The absorption chiller / heater is equipped with an exhaust gas heat exchanger and an exhaust gas damper, and the exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. In order to prevent abnormal overheating of the exhaust gas heat exchanger, the exhaust gas temperature sensor is connected to the exhaust gas heat exchanger while the absorption chiller water heater is stopped. When a temperature above the design temperature is detected, the absorption liquid pump for introducing the low-temperature heat exchanger and the solution pump for introducing the high-temperature heat exchanger are started to cool the exhaust gas heat exchanger, and the cold / hot water pump and cooling water pump are Start Is characterized in that the heat dissipation to the cooling water.

  Further, the control method of the present invention includes an exhaust hot water charging type having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste water heat exchanger. The absorption chiller / heater is equipped with an exhaust gas heat exchanger and an exhaust gas damper, and the exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. A control method for an absorption / cooling hot / cold water heater with exhaust gas / waste water added in such a manner that a commercial power supply supplies power to the exhaust gas damper from a distributed power generation system in the event of a power failure, and the exhaust gas damper is controlled to be closed .

  The control device of the present invention comprises an evaporator, an absorber, a condenser, a low-temperature regenerator, a high-temperature regenerator, a solution low-temperature heat exchanger, a solution high-temperature heat exchanger, and a waste hot water heat exchanger. Install the exhaust gas heat exchanger and the exhaust gas damper on the water machine, and introduce the exhaust gas from the distributed power generation system into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. In the exhaust gas / waste water charging type absorption chiller / heater, the exhaust gas heat exchanger is installed so that the bottom of the exhaust gas heat exchanger is located above the upper end of the overflow pipe of the solution of the low temperature regenerator, and the chiller / heater is stopped. In some cases, the overflow pipe and the absorber are connected by a solution return pipe so that the total amount of the solution in the exhaust gas heat exchanger is returned to the absorber, and the crystallization of the solution when the exhaust gas leaks in the exhaust gas heat exchanger is performed. Is characterized in that the the to.

  Further, the control device of the present invention is an exhaust hot water charging type having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste water heat exchanger. The absorption chiller / heater is equipped with an exhaust gas heat exchanger and an exhaust gas damper, and the exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to make more advanced use of the exhaust heat discharged from the distributed power generation system. In the exhaust gas / exhaust hot water charging type absorption chiller / heater, the exhaust gas damper is provided with a limit switch for detecting the exhaust gas leakage, and if there is an exhaust gas leak during dilution operation, the exhaust gas damper limit switch and At least one of the exhaust gas temperature sensors detects that exhaust gas is leaking, and connects the refrigerant tank and absorber of the evaporator with the automatic refrigerant blow valve. When the exhaust gas leakage is detected by the limit switch, the refrigerant is mixed with the solution by controlling the automatic valve provided in the refrigerant blow piping from the refrigerant tank of the evaporator, and the solution concentration is forced. It is characterized in that the dilution is controlled by lowering to a low level.

The present invention has the following effects.
(1) Avoid the crystallization of the solution when the exhaust gas leaks by installing the exhaust gas heat exchanger at a position higher than the overflow pipe of the low temperature regenerator and returning the total amount of the solution to the absorber when stopped. Can do.
(2) In order to prevent idling of the solution pump due to the reverse flow of the refrigerant vapor due to the pressure difference between the high temperature regenerator and the absorber after the dilution operation, the dilution operation is continued until the pressure of the high temperature regenerator drops to a predetermined pressure. Moreover, since the cold water pump and the cooling water pump are operated until the dilution operation is completed in order to shorten the time, the idling of the solution pump after the dilution operation can be reliably controlled.
(3) When exhaust gas leaks during the dilution operation, the exhaust gas damper limit switch and exhaust gas temperature sensor detect at least one of the exhaust gas leaks, and the refrigerant tank is installed in the refrigerant blow pipe. By controlling the automatic valve, the refrigerant can be mixed with the solution to forcibly reduce the solution concentration.
(4) When the absorption chiller / heater is stopped, if the exhaust gas temperature sensor detects the design temperature or higher, the solution pump is started to cool the exhaust gas heat exchanger, and at the same time, the chill / hot water pump and the cooling water pump are started. Since heat is radiated to the cooling water, it is possible to effectively prevent abnormal overheating of the exhaust gas heat exchanger.
(5) When the commercial power supply supplies power from the distributed power generator to the exhaust gas damper at the time of a power failure and closes the exhaust gas damper, it becomes safe and the risk of failure can be avoided.

FIG. 1 is a flow sheet of a control device for an absorption chiller / heater using exhaust gas of a distributed power generation system according to a first embodiment of the present invention. FIG. 2 is a configuration explanatory diagram for facilitating understanding of the description of the main part of the control device shown in FIG. FIG. 3 is a systematic schematic configuration diagram showing an example of a conventional absorption chiller / heater.

  Dilution operation is not possible due to exhaust of the exhaust gas due to malfunction of the exhaust gas damper and deterioration of sealing performance, etc. due to solution pump idling after completion of dilution operation in exhaust gas / exhaust hot water absorption type absorption chiller / hot water machine, solution crystallization, exhaust gas heat The purpose of solving the problem of abnormal overheating of the exchanger, reducing the failure rate, and improving maintenance safety was realized by a new liquid circulation cycle and its control.

  Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications. FIG. 1 is a flow sheet of a control device for an absorption chiller / heater using exhaust gas of a distributed power generation system according to a first embodiment of the present invention, and FIG. 2 is an easy-to-understand explanation of the main part of the control device of the present invention. FIG.

  As shown in FIG. 1, the absorption chiller / heater in the apparatus of the present invention, for example, has an absorption liquid (for example, an aqueous solution of lithium bromide) flowing from the absorber 50 to the high temperature regenerator 58 via the low temperature regenerator 54. The reverse cycle is configured. The absorption cycle in this absorption chiller / heater will be described. First, an absorption liquid (diluted absorption liquid) whose concentration has been reduced by absorbing a large amount of refrigerant vapor in the absorber 50 is transferred from the absorber 50 to a low-temperature heat exchanger (solution low temperature). After being heated by this low-temperature heat exchanger 52, it is sent to the exhaust hot water heat exchanger 53, further heated and sent to the low-temperature regenerator 54. The dilute absorbent is regenerated at a low temperature in the low-temperature regenerator 54, and a part of the absorbed refrigerant is released, and the concentration is increased by that amount to become an intermediate-concentrated absorbent (intermediate absorbent). Next, the intermediate absorbent is fed from the low temperature regenerator 54 to a high temperature heat exchanger (solution high temperature heat exchanger) 56, heated by the high temperature heat exchanger 56, and then discharged from the distributed power generation system. The exhaust heat (exhaust gas) is supplied to the exhaust gas heat exchanger 57 using the exhaust heat (exhaust gas) as a heat source, further heated and supplied to the high temperature regenerator 58. The refrigerant vapor from the exhaust gas heat exchanger 57 is sent to the high temperature regenerator 58 through the refrigerant vapor pipe 59.

  The intermediate absorbent is regenerated at a high temperature in the high-temperature regenerator 58, and a part of the absorbed refrigerant (for example, water vapor) is released to further increase the concentration to become a high-concentration absorbent (concentrated absorbent). . The concentrated absorbent is returned to the heating side of the high-temperature heat exchanger 56 as a heating source for heating the intermediate absorbent, and further, the heating source for heating the diluted absorbent to the heating side of the low-temperature heat exchanger 52. And then returned to the absorber 50. The returned concentrated absorbing liquid is sprayed on the heat transfer tube in the absorber 50, and again absorbs the refrigerant vapor while being cooled by the cooling water to become the diluted absorbing liquid. 51 is a condenser, 55 is an evaporator, 62 is an absorption liquid pump, 64 is a solution pump, 66 is a refrigerant pump, 68 is a cooling water pump, 70 is a cold / hot water pump, 72 is a cooling / heating switching valve, and 76 is waste water for heating. It is a heat recovery unit.

  The heat transfer pipe of the waste heat water heat exchanger 53 is introduced with a distributed power generation system and other waste heat water from outside the system, and heats the absorbing liquid sent from the low temperature heat exchanger 52 and sprayed. 74 and 75 are cooling / heating switching valves, and 78 is an exhaust hot water three-way valve. The inlet line and the outlet line of the waste water are branched and connected to the waste heat water heat recovery unit 6 for heating.

  Exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger 57, the absorption liquid sent from the high temperature heat exchanger 56 is heated, and the heated absorption liquid is sent to the high temperature regenerator 58. 80 is an exhaust gas three-way damper of the exhaust gas inlet side duct, and 82 is an exhaust gas two-way damper of the exhaust gas outlet side duct. An exhaust gas temperature sensor 83 is connected to the absorption liquid pump 62 and the solution pump 64. Although not shown, limit switches are connected to the exhaust gas dampers 80 and 82.

  A refrigerant reservoir 86 is provided below the evaporator 55, and a refrigerant tank 88 is connected to the refrigerant reservoir 86. The refrigerant tank 88 and the absorber 50 are connected by a refrigerant blow pipe 92 having a refrigerant blow automatic valve 90 (for example, an electromagnetic valve). 94 is a low temperature regenerator overflow pipe, and this pipe 94 is connected to the upper part of the absorption pipe 50 through a solution return pipe 96 forming a substantially U-shape. And the connection part of the upper part of the absorption pipe 50 is lower than the upper end of the low temperature regenerator overflow pipe 94.

  Further, the exhaust gas heat exchanger 57 is provided so that the bottom surface of the exhaust gas heat exchanger 57 is positioned at a position higher than the upper end of the solution overflow pipe 94 of the low temperature regenerator 54. The overflow pipe 94 and the absorber 50 are connected by a solution return pipe 96 so that the total amount of the solution in the exhaust gas heat exchanger 57 is returned to the absorber 50 when the chiller / heater is stopped, and the exhaust gas in the exhaust gas heat exchanger 57 is connected. It is configured to avoid crystallization of the solution at the time of leakage.

  The liquid circulation cycle and control in the present invention will be described below. As shown in FIG. 1, the absorption chiller / heater with exhaust gas / waste hot water is used to heat-exchange the exhaust gas and intermediate liquid of the distributed power generation system in the exhaust gas heat exchanger 57 and use the heat quantity of the exhaust gas for heating the intermediate liquid. As a result, the fuel consumption has been further reduced compared to the drained hot water absorption type absorption chiller / heater. Further, the exhaust gas heat exchanger 57 is arranged in series between the high temperature heat exchanger 56 and the high temperature regenerator 58, and the refrigerant vapor generated in the exhaust gas heat exchanger 57 is directly below the eliminator of the high temperature regenerator 58 through the refrigerant vapor pipe 59. Gas-liquid separation. The pipe 59 also serves as a pressure equalizing pipe for the exhaust gas heat exchanger 57 and the high temperature regenerator 58.

In this arrangement, there are four points to be considered with respect to the leakage of exhaust gas in the exhaust gas heat exchanger 57 as follows.
(1) Exhaust gas leakage during shutdown (2) Exhaust gas leakage during dilution operation (3) Exhaust gas leakage exceeding the design temperature (4) When the operation of the distributed generator is continued during a power failure Control of exhaust gas damper

(1) Exhaust gas leakage while stopped Conventionally, the exhaust gas heat exchanger 57 may be installed beside the main body. In this case, the solution remains in the exhaust gas heat exchanger during the stop. If exhaust gas leaks in this state, the remaining solution may be heated and crystallized, making it impossible to restart. There is also a system that installs an exhaust fan to scavenge the exhaust gas that has leaked, but it cannot be a sufficient measure if the exhaust gas leaks frequently.
Therefore, in the exhaust gas / waste hot water charging type absorption chiller / heater, as shown in FIGS. 2A, 2B, and 2C, no solution remains in the exhaust gas heat exchanger 57 when stopped. As described above , the exhaust gas heat exchanger 57 is installed at a position higher than the overflow pipe 94 of the low-temperature regenerator 54, and the solution supply pipe is connected to the lowermost part of the exhaust gas heat exchanger. Is configured to return to the total amount absorber 50. Therefore, crystallization of the solution does not occur even if the exhaust gas leaks during the stop, and there is no problem in quality.

  However, by adopting this arrangement, after completion of the dilution operation, after all the solution in the exhaust gas heat exchanger 57 has returned to the absorber 50, the high-pressure refrigerant vapor in the high-temperature regenerator 58 is discharged from the exhaust gas heat exchanger 57. The refrigerant flows back to the absorber 50 through the refrigerant vapor pipe 59. At that time, the solution pump 64 may idle due to the refrigerant vapor flow, and the solution pump 64 may be seized (see part (c) of FIG. 2). As a countermeasure, the dilution operation is continued until the pressure of the high-temperature regenerator 58 decreases to a predetermined value. Further, in order to efficiently reduce the pressure of the high-temperature regenerator, the cold / hot water pump 70 and the cooling water pump 68 are operated to dissipate the heat in the machine to the cooling water. Thereby, the pressure of the high temperature regenerator 58 can be reduced to a predetermined value within the normal dilution operation time.

(2) Exhaust gas leakage during dilution operation Dilution operation is an operation in which the concentration is lowered before the operation is stopped, but if there is heat input due to the leakage of exhaust gas, the refrigerant is regenerated and the concentration is unlikely to decrease. . Therefore, even if the dilution operation is performed for a predetermined time, the concentration may not be lowered to a predetermined value or less, and the solution may crystallize during the stop.
Therefore, as shown in FIG. 2 (d), when the absorption chiller / heater is stopped, exhaust gas leaks into the exhaust gas heat exchanger 57 due to malfunction of the exhaust gas dampers 80, 82 or poor sealing performance. In this case, this is detected by the limit switch of the exhaust gas damper, and the automatic valve (for example, electromagnetic valve) 90 provided in the blow pipe 92 connecting the refrigerant tank 88 and the absorber 50 of the evaporator is opened to open the evaporator 55. Mix all the refrigerant in the solution to forcibly reduce the solution concentration.

  Instead of using the limit switch of the exhaust gas damper, the exhaust gas temperature sensor 83 can be used to detect the leakage of the exhaust gas. In some cases, both the limit switch of the exhaust gas damper and the exhaust gas temperature sensor 83 are used.

(3) Exhaust gas leakage exceeding the design temperature Depending on the operating state of the distributed power generation system, the exhaust gas may be hotter than the design temperature of the exhaust gas heat exchanger 57 (for example, 400 ° C.). When such high temperature exhaust gas leaks into the exhaust gas heat exchanger 57 due to malfunction of the exhaust gas dampers 80, 82 or poor sealing performance, the exhaust gas heat exchanger 57 is not a solution if the absorption chiller / heater is in operation. This is not a problem because it is cooled by the liquid. However, when it is stopped, as described above, there is no solution in the exhaust gas heat exchanger 57, so there is a risk that the heat-resistant temperature of the material used will be exceeded.
Therefore, when the exhaust gas temperature sensor 83 senses and exhaust gas at the design temperature or higher flows, the solution pump 64 and the absorption liquid pump 62 are activated to cool the exhaust gas heat exchanger 57. In addition, the cold / hot water pump 70 and the cooling water pump 68 are activated to prevent the cooling water from radiating heat in order to prevent the solution concentration from rising due to heat input from the exhaust gas and the pressure inside the apparatus from rising.

(4) Control of the exhaust gas damper when the distributed power generator can be operated when the commercial power supply is interrupted If the distributed power generator continues to operate only when the commercial power supply is interrupted, the absorption chiller / heater has the exhaust gas dampers 80 and 82 It becomes impossible to operate in the state at the time of power failure, and inflow of exhaust gas is inevitable. In this case, since there is no means for detecting the exhaust gas temperature, the exhaust gas heat exchanger 57 may be damaged if the exhaust gas having a temperature higher than the design temperature leaks. In order to avoid this, power is supplied to the exhaust gas dampers 80 and 82 from the distributed power generator, and the exhaust gas dampers 80 and 82 are closed.

  In the exhaust gas heat exchanger of the absorption chiller / heater using the exhaust gas of the distributed power generation system, failure due to crystallization of the solution when the exhaust gas leaks can be prevented.

DESCRIPTION OF SYMBOLS 10 Absorber 12 Low temperature heat exchanger 14 Low temperature regenerator 16 High temperature heat exchanger 18 High temperature regenerator 20 Combustion part 22 Condenser 24 Evaporator 26, 28 Absorption liquid piping 30 Bypass pipe 32 Absorption liquid pump 34 Absorption liquid pump (solution pump) )
36 Refrigerant pump 38 Cooling water pump 40 Cold / hot water pump 42 Cooling / heating switching valve 50 Absorber 51 Condenser 52 Low temperature heat exchanger 53 Waste hot water heat exchanger 54 Low temperature regenerator 55 Evaporator 56 High temperature heat exchanger 57 Exhaust gas heat exchanger 58 High temperature regenerator 59 Refrigerant vapor piping 62 Absorption liquid pump 64 Solution pump 66 Refrigerant pump 68 Cooling water pump 70 Chilled / warm water pump 72, 74, 75 Cooling / heating switching valve 76 Heating wastewater water heat recovery device 78 Wastewater three-way valve 80 Exhaust gas three-way damper 82 Exhaust gas two-way damper 83 Exhaust gas temperature sensor 86 Refrigerant reservoir 88 Refrigerant tank 90 Refrigerant blow automatic valve 92 Refrigerant blow pipe 94 Low temperature regenerator overflow pipe 96 Solution return pipe

Claims (3)

  Exhaust gas heat exchange to an exhaust hot water input type absorption chiller / heater having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste heat water heat exchanger Exhaust gas / heated hot water input type in which exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to improve the exhaust heat exhausted from the distributed power generation system by using a heat sink and exhaust gas damper An absorption chiller / heater control method, in which an exhaust gas heat exchanger is installed at a position higher than the overflow pipe of the solution in the low-temperature regenerator so that no solution remains in the exhaust gas heat exchanger when the chiller / heater is stopped. Sometimes the total amount of the solution in the exhaust gas heat exchanger is returned to the absorber to avoid crystallization of the solution when the exhaust gas leaks in the exhaust gas heat exchanger. Method of controlling the water machine. Exhaust gas heat exchange to an exhaust hot water input type absorption chiller / heater having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste heat water heat exchanger Exhaust gas / heated hot water input type in which exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to improve the exhaust heat exhausted from the distributed power generation system by using a heat sink and exhaust gas damper This is a control method for an absorption chiller / heater that prevents idling of a solution pump for introducing a high-temperature heat exchanger due to a reverse flow of refrigerant vapor caused by a pressure difference between a high-temperature regenerator and an absorber after dilution operation. In order to avoid the occurrence of seizure, the dilution operation is continued until the saturation temperature of the refrigerant vapor in the high-temperature regenerator falls below a predetermined value, and in order to reduce the time for the dilution operation, water The method of the absorption chiller utilizing exhaust gas of distributed generation system characterized by operating the pump and the cooling water pump. Exhaust gas heat exchange to an exhaust hot water input type absorption chiller / heater having at least an evaporator, an absorber, a condenser, a low temperature regenerator, a high temperature regenerator, a solution low temperature heat exchanger, a solution high temperature heat exchanger, and a waste heat water heat exchanger Exhaust gas / heated hot water input type in which exhaust gas from the distributed power generation system is introduced into the exhaust gas heat exchanger in order to improve the exhaust heat exhausted from the distributed power generation system by using a heat sink and exhaust gas damper In an absorption chiller / heater, the bottom of the exhaust gas heat exchanger is positioned higher than the upper end of the overflow pipe of the solution in the low temperature regenerator so that no solution remains in the exhaust gas heat exchanger when stopped. And connecting the overflow pipe and the absorber with a solution return pipe so that the total amount of the solution in the exhaust gas heat exchanger is returned to the absorber when the chiller / heater is stopped. The solution of the control device of the absorption chiller utilizing exhaust gas of a distributed power generation system is characterized in that so as to avoid crystallization when leakage.

Images