KR100512827B1 - Absorption type refrigerator - Google Patents

Abstract

The absorption chiller provided with the mechanism which collect | recovers heat from exhaust gas makes it a subject to prevent the water vapor contained in exhaust gas from condensing and condensing even at the time of starting or partial load operation.

Absorption liquid pipe (bypass absorbing liquid pipe) for installing the first and second exhaust gas heat recovery devices 23 and 24 and flowing the rare absorbent liquid from the low temperature heat exchanger 9 bypassing the second exhaust gas heat recovery device 24. 11B is provided, the flow rate control valve 25 is installed in the absorbing liquid pipe 11A leading to the second exhaust gas heat recovery 24, and the temperature sensor 26 is a predetermined temperature higher than the dew point temperature of the exhaust gas. A controller 27 was installed to control the opening of the flow control valve 25 so as to continuously detect the temperature (for example 100 ° C.).

Description

Absorption Chillers {ABSORPTION TYPE REFRIGERATOR}

The present invention relates to an absorption chiller.

As shown in FIG. 5, the exhaust gas discharged from the gas burner 2 for heating and boiling the rare absorbent liquid of the high temperature regenerator 1 is discharged between the high temperature heat exchanger 10 and the high temperature regenerator 1 of the absorbent liquid pipe 11. Is sequentially transferred to the first exhaust gas heat recovery unit 23 provided in the second exhaust gas heat recovery unit 24 provided between the low temperature heat exchanger 9 and the high temperature heat exchanger 10, and the high temperature regenerator from the absorber 7. Absorption type refrigerators which have been studied to raise the temperature of the rare absorbent liquid returned to (1), reduce the amount of heating required by the gas burner 2, and reduce fuel consumption are widely known.

In other words, in the absorption chiller having the above-described configuration, the rare water absorbing liquid at about 40 ° C (the same applies during the rated operation) discharged from the absorber 7 is a low-temperature heat exchanger 9 and a second exhaust gas heat recovery unit 24. Since it is heated in each of the high temperature heat exchanger 10 and the first exhaust gas heat exchanger 23 and rises around 140 ° C and flows into the high temperature regenerator 1, the fuel consumed by the gas burner 2 can be saved.

When the temperature of the exhaust gas from the gas burner 2 and the temperature of the rare absorbent liquid supplied from the absorber 7 are both low, the opening degree of the flow rate control valve 25 is increased to increase the absorbent liquid tube (bypass absorbent liquid tube) ( 11B) increases the amount of rare water absorbing liquid and reduces the heat recovery from the exhaust gas in the second exhaust gas heat recovery unit 24 to prevent a significant decrease in the exhaust gas temperature, thereby reducing the amount of water vapor contained in the exhaust gas. Condensation and condensation are prevented.

However, in the conventional absorption chiller, since the flow control valve 25 is provided in the absorbing liquid pipe (bypass absorbing liquid pipe) 11B bypassing the second exhaust gas heat recovery device 24, the flow control valve 25 ), The amount of rare absorbent liquid flowing through the absorbent liquid pipe 11A to the second exhaust gas heat recovery unit 24 was not small.

Therefore, when the temperature of the exhaust gas and the rare water solution is low, such as at the start of operation, even if the flow control valve is completely opened, the temperature of the exhaust gas is excessively lowered, and the water vapor contained in the exhaust gas condenses and condenses. It was necessary to provide the absorption chiller of the structure which does not produce such a fault because it may corrode.

In order to solve the above problems of the prior art, the present invention provides a high temperature regenerator for heating and boiling in a combustion device to evaporate and separate a refrigerant and obtain refrigerant vapor and an intermediate absorbent liquid from the rare absorbent liquid, and an intermediate absorbent liquid generated and supplied in the high temperature regenerator at a high temperature. The low temperature regenerator which is heated by the refrigerant vapor generated by the regenerator and evaporates and separates the refrigerant again, and obtains the refrigerant vapor and the concentrated absorbent liquid from the intermediate absorbent liquid. And a condenser for cooling the refrigerant vapor supplied to obtain the refrigerant liquid, an evaporator in which the refrigerant liquid supplied from the condenser is scattered on the heat transfer tube and takes heat from the fluid flowing in the heat transfer tube, and the refrigerant evaporates. To separate the refrigerant vapor from the low temperature regenerator The absorber absorbed by the supplied absorbent liquid into a rare absorbent liquid and supplied to a high temperature regenerator, the low-temperature heat exchanger that heat exchanges the rare absorbent liquid entering and exiting the absorber, and the intermediate absorbent liquid and the rare absorbent liquid entering and entering the high temperature regenerator are heated. An absorption chiller having a high temperature heat exchanger to be replaced, wherein the exhaust gas discharged from the combustion device and the rare absorbent liquid having passed through the high temperature heat exchanger pass through a first exhaust gas heat recovery unit and a first exhaust gas heat recovery unit. A second exhaust gas heat recovery unit in which the exhaust gas passes through the low temperature heat exchanger and before the high temperature heat exchanger enters into the high temperature heat exchanger, and a rare absorption liquid pipe or the second exhaust gas heat passing through the second exhaust gas heat recovery unit; A bypass rare water pipe or bypass exhaust pipe that bypasses the recovery unit and joins the rare water pipe, and the bypass rare water pipe or bypass A valve interposed in the rare water liquid pipe or the exhaust pipe via the second exhaust gas heat recovery unit of the rare water liquid pipe or the exhaust pipe provided with the engine, and control means for controlling the opening and closing of the valve based on the temperature of the exhaust gas. The absorption chiller of the first configuration,

In the absorption chiller of the first configuration, a portion of the rare absorbent liquid discharged from the absorber bypasses the low temperature heat exchanger, exchanges heat with the radiant refrigerant discharged from the low temperature regenerator, and introduces the rare absorbent liquid branch pipe introduced into the second exhaust gas heat recovery unit. It is an object of the present invention to provide an absorption chiller having a second configuration.

(Embodiment of the Invention)

An embodiment of the present invention will be described below by taking an example of an absorption chiller using water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorption liquid.

(1st embodiment)

EMBODIMENT OF THE INVENTION The 1st Embodiment of this invention is described based on FIG. In the drawings, reference numeral 1 denotes a high temperature regenerator configured to evaporate and separate the refrigerant by heating the absorbent liquid by the thermal power of the gas burner 2 which is fueled by city gas, for example, 3 a low temperature regenerator, 4 a condenser, and 5 Is a high temperature cylinder in which the low temperature regenerator 3 and the condenser 4 are housed, 6 is an evaporator, 7 is an absorber, 8 is a low temperature cylinder in which the evaporator 6 and the absorber 7 are housed, 9 is Low temperature heat exchanger, 10 is a high temperature heat exchanger, 11 to 13 is an absorbent liquid tube, 14 is an absorbent liquid pump, 15 to 18 is a refrigerant tube, 19 is a refrigerant pump, 20 is a cold water pipe, 21 is a coolant Tube 22 denotes an exhaust pipe through which exhaust gas from the gas burner 2 passes, 23 indicates a first exhaust gas heat recoverer, 24 indicates a second exhaust gas heat recoverer, 25 indicates a flow control valve, and 26 indicates an exhaust pipe. The exhaust flowing downstream of the Temperature The temperature sensor 22, reference numeral 27 for detecting the temperature of the sensor 26 is a controller for controlling the opening degree of the flow control valve 25 to keep detecting the 100 ℃, for a given temperature, for example.

In the absorption chiller of the above-described configuration, when the gas burner 2 burns the city gas and heats the rare absorbent liquid in the high temperature regenerator 1, the refrigerant vapor separated from the rare absorbent liquid and the refrigerant vapor are separated from each other, and the concentration of the absorbed liquid is reduced. An intermediate absorbent liquid with a high yield is obtained.

The high temperature refrigerant vapor generated in the high temperature regenerator 1 enters the low temperature regenerator 3 through the coolant tube 15, and is generated in the high temperature regenerator 1 and is absorbed by the absorbent liquid tube 11 to the high temperature heat exchanger 10. The intermediate absorbent liquid that has entered the low temperature regenerator 3 is heated to condense heat, and enters the condenser 4.

In addition, the refrigerant heated in the low temperature regenerator 3 and separated by evaporation from the intermediate absorbent liquid enters the condenser 4, and heat-exchanges with water flowing in the cooling water pipe 21 to condense and condensate from the refrigerant pipe 16. With the refrigerant supplied, it enters the evaporator 6 through the refrigerant pipe 17.

The refrigerant liquid entering the evaporator 6 and collected in the refrigerant liquid reservoir is dispersed by the refrigerant pump 19 over the heat transfer pipe 20A connected to the cold water pipe 20, and supplied with the cold water pipe 20. It exchanges and evaporates and cools the water which flows inside the heat exchanger tube 20A.

The refrigerant evaporated in the evaporator (6) enters the absorber (7), is heated in the low temperature regenerator (3) to evaporate and separates the refrigerant, and the low temperature heat exchanger (9) by the absorbent liquid, i. It is supplied via), and is absorbed by the concentrated absorbent liquid dispersed from above.

The absorbent liquid absorbing the refrigerant in the absorber 7 and the concentration thereof, that is, the rare absorbent liquid, is operated by the operation of the absorbent liquid pump 14 and the high temperature heat exchanger 9 and the second exhaust gas heat recoverer 24 (part of the absorbent liquid pipe ( Flows through the bypass absorbent liquid pipe 11B), the high temperature heat exchanger 10, and the first exhaust gas heat recovery 23, respectively, and is transferred from the absorbent liquid pipe 11 to the high temperature regenerator 1.

As described above, when the absorption chiller is operated, in the heat transfer pipe 20A piped inside the evaporator 6, the cold water cooled by the heat of vaporization of the refrigerant passes through the cold water pipe 20, not shown. Since circulation can be supplied to the furnace, cooling operation such as cooling can be performed.

In the absorption chiller having the above-described configuration, similarly to the conventional absorption chiller shown in FIG. 5, the rare absorbent liquid at about 40 ° C. of the absorber 7 conveyed to the high temperature regenerator 1 by the absorption liquid pump 14 is a low temperature heat. It is heated in each of the exchanger 9, the 2nd exhaust gas heat recoverer 24 (some rare water absorbing liquid bypasses), the high temperature heat exchanger 10, and the 1st exhaust gas heat recoverer 23, and is heated to about 140 degreeC. Increases and is supplied to the high temperature regenerator 1, so that the fuel consumed by the gas burner 2 can be reduced rather than the absorption type refrigerator having no first exhaust gas heat recoverer 23 and the second exhaust gas heat recoverer 24. have.

That is, when the temperature sensor 26 detects the temperature higher than predetermined | prescribed 100 degreeC by the controller 27, the temperature of the flow control valve 25 is made large and from the absorber 7 to the high temperature regenerator 1 A larger amount of the rare absorbent liquid being transferred is supplied to the second exhaust gas heat recovery unit 24 via the absorbent liquid pipe 11A, and the recovery of the heat retained by the exhaust gas is promoted.

In addition, in the absorption type refrigerator of the present invention, when the temperature sensor 26 detects a temperature lower than 100 ° C., the entire amount of the rare absorbent liquid bypasses the second exhaust gas heat recovery unit 24 so as to absorb the absorbent liquid tube (bypass absorbent liquid tube). Since the flow rate control valve 25 can be tightened to the maximum complete closure until the flow to 11B, the amount of heat recovered from the exhaust gas can be suppressed to a maximum of zero. Also in the city, the temperature of the exhaust gas discharged from the gas burner 2 and flowing in the exhaust pipe 22 is the dew point temperature (the city gas, that is, the dew point temperature of the combustion exhaust gas when natural gas is used as a fuel). ) Is maintained at a higher than 100 ℃, the water vapor contained in the exhaust gas is not condensed, the drain water is not generated, and the corrosion problem by the drain water does not occur All.

(2nd embodiment)

2nd Embodiment of this invention is described based on FIG. In the absorption chiller of the second embodiment, a refrigerant heat recovery device 28 is provided in addition to the piping configuration of the absorption chiller of the first embodiment shown in FIG.

In the refrigerant heat recovery unit 28, a refrigerant absorbing the medium absorbent liquid from the low temperature regenerator 3 to the condenser 4, that is, the low temperature regenerator 3, and evaporating and separating the refrigerant, the absorber 7 A portion of the rare absorbent liquid conveyed to the high temperature regenerator 1 by the absorbent liquid pump 14, that is, the rare absorbent liquid flowing through the absorbent liquid pipe (absorbent liquid branch pipe) 11C provided by bypassing the low temperature heat exchanger 9. Is supplied to heat exchange, and the fish heat retained by the refrigerant liquid is recovered by the rare absorbent liquid conveyed to the high temperature regenerator (1). Other piping configurations are the same as those of the absorption chiller of the first embodiment.

In the absorption chiller of the second embodiment, a part of the rare absorbent liquid returned from the absorber 7 to the high temperature regenerator 1 by the operation of the absorbent liquid pump 14 is a low temperature heat exchanger interposed in the absorbent liquid pipe 11 ( 9), the remainder is heated in each heat exchanger via the refrigerant heat recovery unit 28 interposed in the absorbent liquid pipe (absorbent liquid branch pipe) 11C.

In addition, the amount of the rare absorbing liquid heated by the exhaust gas from the gas burner 2 via the second exhaust gas heat recovery 24 is controlled by the flow control valve 25 interposed in the absorbing liquid pipe 11A, In the high temperature heat exchanger 10 and the first exhaust gas heat recovery unit 23, the entire amount of the rare absorbent liquid flowing from the absorber 7 to the high temperature regenerator 1 flows to each other.

That is, a part of the rare water absorbing liquid at about 40 ° C. discharged from the absorber 7 to the absorbing liquid tube 11 is discharged from the low temperature regenerator 3 to the absorbing liquid tube 13 to flow at about 90 ° C. flowing in the absorber 7. The heat exchanger is concentrated in the concentrated absorbent liquid and the low temperature heat exchanger 9 to raise the temperature to about 85 ° C., and the remainder is condensed in the low temperature regenerator 3 and the refrigerant liquid at about 95 ° C. in the refrigerant pipe 16 flowing in the condenser 4. And heat exchange in the refrigerant heat recovery unit 28, the temperature rises to 70 ° C, and these are joined, for example, to become a rare absorption liquid around 80 ° C, and the absorption liquid pipe 11 flows toward the high temperature regenerator 1.

The flow rate of the rare water absorbing liquid flowing into the second exhaust gas heat recovery unit 24 is controlled by the controller 27 similarly to the absorption type refrigerator of the first embodiment shown in FIG. That is, the controller 27 increases the temperature of the flow control valve 25 when the temperature sensor 226 detects a temperature higher than the predetermined 100 ° C., and increases the amount of the rare water absorbing liquid in the second exhaust gas heat recoverer. Supply to 24 to promote recovery of heat held by the exhaust gas.

On the other hand, when the temperature sensor 26 detects a temperature lower than 100 ° C, the total flow rate of the rare absorbent liquid bypasses the second exhaust gas heat recovery unit 24 and flows to the absorbent liquid tube (bypass absorbent liquid tube) 11B. Since the amount of heat recovered from the exhaust gas can be suppressed to the maximum zero by tightening the control valve 25 to the maximum complete closing, the gas burner 2 can be operated even when the exhaust gas and the rare absorbent liquid have both low start-up and partial load operation. The temperature of the exhaust gas discharged from the exhaust gas and flowing in the exhaust pipe 22 is maintained at 100 ° C. higher than the dew point temperature, and the water vapor contained in the exhaust gas is not condensed, and the drain water is not generated. There is no problem.

Then, the rare absorbent liquid heated via the second exhaust gas heat recoverer 24 and the rare absorbent liquid not heated via the second exhaust gas heat recoverer 24 and thus not heated are joined to the high temperature heat exchanger 10. And an intermediate absorbent liquid flowing from the high temperature regenerator 1 to the low temperature regenerator 3 via the absorbent liquid tube 12 via the first exhaust gas heat recovery 23, and about 200 ° C. discharged from the gas burner 2. Heat-exchanged with the exhaust gas, and becomes a rare water absorbing liquid at about 140 ° C. and flows into the high temperature regenerator 1, thereby saving fuel consumed by the gas burner 2.

In addition, the refrigerant liquid condensed in the low temperature regenerator 3 and introduced into the condenser 4 through the refrigerant pipe 16 is heat-exchanged with the rare absorbing liquid of about 40 ° C. in the refrigerant heat recovery unit 28 as described above. After heating, the coolant liquid itself is cooled to about 45 deg. C (formerly about 95 deg. C), and therefore, the amount of heat radiating heat to the cooling water flowing inside the cooling water pipe 21 is reduced. Therefore, the required heat input amount in the high temperature regenerator 1 can be reduced, and the thermal efficiency is further improved than the absorption chiller of the first embodiment shown in FIG.

(Third embodiment)

A third embodiment of the present invention will be described with reference to FIG. In the absorption type refrigerator of the third embodiment, the second exhaust gas heat recovery unit 24 is replaced with the absorption tube (bypass absorption liquid tube) 11B provided with the absorption type refrigerator of the first embodiment shown in FIG. 22B of exhaust pipes (bypass exhaust pipes) 22B and bypass pipes (bypass exhaust pipes) 22B which are provided with a bypass exhaust pipe (bypass exhaust pipe) 22B and pass through the second exhaust gas heat recovery unit 24 instead of the flow control valve 25. The switching valve 25A is provided at the branch.

Moreover, the temperature sensor 26 is provided in the exhaust pipe 22 of an upstream rather than the branch part of the exhaust pipe 22A and the exhaust pipe (bypass exhaust pipe) 22B. Other piping configurations are the same as those of the absorption chiller of the first embodiment.

In the absorption type refrigerator according to the third embodiment, when the temperature sensor 26 detects a predetermined temperature, for example, a temperature higher than 150 ° C., the total amount of the exhaust gas emitted from the gas burner 2 is measured. When the heat is recovered from the exhaust gas by flowing through the exhaust gas heat recovery unit 24, and the temperature sensor 26 detects a temperature lower than a predetermined temperature of 150 ° C., the second exhaust gas heat recovery unit 24 stores the entire amount of the exhaust gas. The controller 27 performs switching control of the switching valve 25A so as to bypass the flow and deteriorate significantly in the exhaust gas temperature.

Therefore, also in the absorption type refrigerator of this 3rd Embodiment, the fuel consumed by the gas burner 2 can be reduced, and thermal efficiency is improved. In addition, the temperature of the exhaust gas discharged from the second exhaust gas heat recovery unit 24 by heat exchange with the rare water solution does not fall below a required temperature, for example, 100 ° C. Therefore, water vapor contained in the exhaust gas is condensed and no drain water is generated, and no corrosion problem is caused by the drain water.

(4th embodiment)

A fourth embodiment of the present invention will be described with reference to FIG. Also in the absorption type refrigerator of the fourth embodiment, the second exhaust gas heat recovery unit 24 is replaced with the absorption liquid tube (bypass absorption liquid tube) 11B provided with the absorption type refrigerator of the second embodiment shown in FIG. 22B of exhaust pipes (bypass exhaust pipes) 22B and bypass pipes (bypass exhaust pipes) 22B which are provided with a bypass exhaust pipe (bypass exhaust pipe) 22B and pass through the second exhaust gas heat recovery unit 24 instead of the flow control valve 25. The switching valve 25A is provided at the branch.

The temperature sensor 26 is provided in the exhaust pipe 22 on the upstream side of the branch of the exhaust pipe 22A and the exhaust pipe (bypass exhaust pipe) 22B, similarly to the absorption chiller of the third embodiment. The piping configuration is the same as that of the absorption chiller of the second embodiment.

And also in the absorption type refrigerator of this 4th Embodiment, when the temperature sensor 26 detects a predetermined temperature, for example, temperature higher than 150 degreeC like the absorption type refrigerator of the said 3rd Embodiment, a gas burner When the entire amount of the exhaust gas from (2) is flowed into the second exhaust gas heat recovery machine 25 to recover heat from the exhaust gas, and the temperature sensor 26 detects a temperature lower than a predetermined temperature of 150 ° C., the exhaust gas is exhaust gas. The switching of the switching valve 25A is controlled by the controller 27 so as to bypass the second exhaust gas heat recovery unit 24 so that the entire amount of the gas flows through the second exhaust gas heat recovery unit 24.

Therefore, also in the absorption type refrigerator of this 4th embodiment, the fuel consumed by the gas burner 2 can be reduced, and thermal efficiency is improved. In addition, the temperature of the exhaust gas discharged from the second exhaust gas heat recovery unit 24 by heat exchange with the rare water solution does not fall below a required temperature, for example, 100 ° C. Therefore, water vapor contained in the exhaust gas is condensed and no drain water is generated, and no corrosion problem is caused by the drain water.

In addition, since this invention is not limited to the said embodiment, various deformation | transformation is possible in the range which does not deviate from the meaning described in the claim.

For example, an inexpensive on / off valve is provided in place of the flow control valve 25, and is simply controlled by the controller 27 so that the exhaust gas temperature detected by the temperature sensor 26 does not fall below a predetermined temperature. It can also be set to.

Instead of the flow control valve 25, a switching valve or a flow control valve capable of controlling the distribution ratio is provided at the end of the absorbent liquid pipe 11A, that is, at the branch of the absorbent liquid pipe (bypass absorbent liquid pipe) 11B or at the confluence thereof. It can also be configured.

In addition, in the absorption chillers of the third and fourth embodiments shown in Figs. 3 and 4, the second gas for detecting the exhaust gas temperature is also located upstream of the confluence of the exhaust pipe (bypass exhaust pipe) 22B of the exhaust pipe 22A. When the temperature sensor is provided and the second temperature sensor detects a temperature lower than a predetermined temperature of 100 ° C., the entire amount of the exhaust gas emitted from the gas burner 2 is bypassed by the second exhaust gas heat recovery unit 24. 2 When the temperature sensor 26 detects a temperature higher by a predetermined temperature, for example, 5 ° C than the temperature detected when the temperature sensor detects a temperature lower than the predetermined 100 ° C, the exhaust gas emitted from the gas burner 2 It is also possible to set it as the structure which the controller 27 switches 25 A of switching valves so that the whole quantity may flow to the 2nd exhaust gas heat recovery machine 24.

In addition, the absorbent liquid tube 13 for guiding the concentrated absorbent liquid heated and concentrated in the low temperature regenerator 3 to the absorber 7 via the low temperature heat exchanger 9 is indicated by dotted lines in FIGS. 2 and 4. It is also possible to provide the bypass absorbing liquid pipe 13A and the absorbing liquid pump 29.

As described above, the absorption chiller may be configured to exclusively perform cooling operation such as cooling, and the refrigerant vapor heated and generated by the high temperature regenerator 1 and the absorption liquid obtained by evaporating separation of the refrigerant vapor directly into the low temperature cylinder 8 are provided. The pipes were connected so that they could be supplied, the rare absorbent liquid was heated by the gas burner 2 without flowing the cooling water into the cooling water pipe 21, and heated to about 55 ° C. in the heat transfer pipe 20A of the evaporator 6, for example. The water may be circulated and supplied to the load via a cold water pipe (preferably called a hot water pipe when hot water circulates) 20 so that heating operation such as cooling may also be performed.

In addition, in the absorption chillers of the second and fourth embodiments shown in Figs. 2 and 4 having the refrigerant heat recovery unit 28, the refrigerant supplied from the low temperature regenerator 3 is rarely cooled by the refrigerant heat recovery unit 28. Since the temperature is sufficiently reduced by heat radiation to the absorbent liquid, the refrigerant pipe 16 may be piped so as to flow into the evaporator 6 instead of the condenser 4.

In addition, as the fluid to be cooled in the evaporator 6 and supplied to the air-conditioning load or the like, water is supplied without changing the phase as in the above embodiment, and the freon or the like is phase-changed so as to enable heat transfer using latent heat. You may do so.

As described above, according to the present invention, it is possible to efficiently recover the heat retained by the exhaust gas. In addition, during start-up or partial load operation at which the exhaust gas temperature is lowered, heat recovery from the exhaust gas can be completely suppressed to zero to prevent abnormal lowering of the exhaust gas temperature, so that water vapor contained in the exhaust gas condenses and drains. Water does not generate | occur | produce and it does not cause the corrosion problem by drain water.

1 is an explanatory diagram showing a first embodiment of the present invention.

2 is an explanatory diagram showing a second embodiment of the present invention;

3 is an explanatory diagram showing a third embodiment of the present invention;

4 is an explanatory diagram showing a fourth embodiment of the present invention;

5 is an explanatory diagram showing a prior art;

<Explanation of symbols for the main parts of the drawings>

1: high temperature regenerator

2: gas burner

3: low temperature regenerator

4: condenser

5: hot tub

6: evaporator

7: absorber

8: cryogenic cylinder

9: low temperature heat exchanger

10: high temperature heat exchanger

11, 11A, 12, 13: absorbing liquid tube

11B: Absorption liquid pipe (bypass absorption liquid pipe)

11C: Absorption liquid pipe (absorbent liquid branch pipe)

14: absorbent liquid pump

15 to 18: refrigerant pipe

19: refrigerant pump

20: cold water pipe

21: cooling water pipe

22, 22A: Exhaust Pipe

22B: Exhaust Pipe (bypass Exhaust Pipe)

23: first exhaust gas heat recoverer

24: second exhaust gas heat recovery

25: flow control valve

25A: switching valve

26: temperature sensor

27: controller

28: refrigerant heat recovery unit

Claims (2)

A high temperature regenerator which evaporates and separates the refrigerant by boiling in a combustion device and obtains the refrigerant vapor and the intermediate absorbent liquid from the rare absorbent liquid, and the intermediate absorbent liquid generated and supplied by the high temperature regenerator is heated with the refrigerant vapor generated by the high temperature regenerator to evaporate the refrigerant again. A low temperature regenerator which separates and obtains refrigerant vapor and concentrated absorbent liquid from the intermediate absorbent liquid, and a condenser obtained by cooling the refrigerant vapor generated and supplied by the low temperature regenerator while simultaneously supplying the refrigerant liquid condensed by heating the intermediate absorbent liquid in the low temperature regenerator. And an evaporator in which the refrigerant liquid supplied from the condenser is scattered on the heat transfer tube and takes heat from the fluid flowing in the heat transfer tube, and the refrigerant evaporates, and the refrigerant vapor generated and supplied by the evaporator is supplied by separating the refrigerant vapor from the low temperature regenerator. Absorb in the concentrated absorbent liquid An absorption chiller comprising an absorber supplied to a high temperature regenerator, a low temperature heat exchanger for heat exchange between the rare absorbent liquid and the concentrated absorbent liquid entering and exiting the absorber, and a high temperature heat exchanger for heat exchange between the intermediate absorbent liquid and the rare absorbent liquid entering and exiting the high temperature regenerator. In The first exhaust gas heat recoverer through which the exhaust gas discharged from the combustion device and the rare absorbent liquid passing through the high temperature heat exchanger exchange heat, the exhaust gas passing through the first exhaust gas heat recoverer, and the low temperature heat exchanger, and the high temperature heat. Bypass rare absorbent liquid which bypasses the rare exhaust liquid pipe or the second exhaust gas heat recoverer via the second exhaust gas heat recoverer and heats the rare absorbent liquid before the exchange into the exchanger A valve interposed between the pipe or the bypass exhaust pipe, the rare absorption liquid pipe provided with the bypass rare water pipe or the bypass exhaust pipe or the second exhaust gas heat recovery device of the exhaust pipe, and the opening and closing of the valve to the exhaust gas. An absorption chiller comprising a control means for controlling based on temperature. The rare water absorbing liquid discharged from the absorber includes a rare water absorbing branch which bypasses the low temperature heat exchanger, exchanges heat with the heat dissipating refrigerant discharged from the low temperature regenerator, and introduces it into the second exhaust gas heat recovery unit. Absorption Chiller.