JP4260099B2 - Absorption refrigerator - Google Patents

Description

  The present invention relates to an absorption refrigerator that uses exhaust heat supplied from other equipment as a heat source of a regenerator that evaporates and separates a refrigerant by heating an absorption liquid.

  As this type of absorption refrigerator, for example, as shown in FIG. 4 and the like, a regenerator that heats and boils the absorbing liquid, separates and generates the refrigerant sent to the evaporator 6 from the absorbing liquid, and concentrates and regenerates the absorbing liquid. As described above, a high-temperature regenerator 1 that uses the combustion heat generated in the gas burner 1A as a heating source for the absorption liquid, a low-temperature regenerator 2 that uses the refrigerant vapor supplied from the high-temperature regenerator 1 as a heating source for the absorption liquid, and cogeneration An absorption refrigerator 100X including a waste heat regenerator 3 using a waste heat fluid supplied from another facility such as a system as a heating source is well known (for example, see Patent Document 1).

  In the figure, 4 is a condenser arranged in parallel with the low-temperature regenerator 2 so that refrigerant vapor evaporated and separated from the absorbent in the low-temperature regenerator 2 can flow in, and 5 is evaporated from the absorbent in the exhaust heat regenerator 3. An exhaust heat condenser arranged in parallel with the exhaust heat regenerator 3 so that the separated refrigerant vapor can flow in; an absorber arranged in parallel with the evaporator 6 so that the refrigerant vapor evaporated in the evaporator 6 can flow in; 8 is a low-temperature heat exchanger, 9 is a high-temperature heat exchanger, 10 is a refrigerant pump, 11 to 13 is an absorption liquid pump, 14 is a flow control valve composed of a three-way valve, 15 to 17 are on-off valves, and 18 to 23 are absorption liquids. Pipes 24 to 29 are refrigerant pipes, 30 is a waste heat fluid supply pipe, 31 is a bypass pipe, 32 is a cold / hot water pipe, and 33 is a cooling water pipe. The pipes are connected as shown in the figure and installed in the evaporator 6. Water that has been cooled / heated to a predetermined temperature via the pipe wall of the heat transfer pipe 6 </ b> A passes through the cold / hot water pipe 32. Is circulated and supplied can be configured to the heat load does not.

  In the absorption refrigerator 100X having the above-described configuration, when the cold water cooled by the heat transfer pipe 6A is circulated and supplied to the heat load via the cold / hot water pipe 32 connected to the heat transfer pipe 6A, a cooling operation such as cooling is performed. The temperature of the exhaust heat fluid supplied from other equipment as a heat source to the heat transfer tube 3A in the exhaust heat regenerator 3 via the exhaust heat fluid supply pipe 30 is lower than, for example, a predetermined temperature of 70 ° C., and the exhaust heat regenerator When the flow control valve 14 cannot be used for the refrigerant generation and the concentration regeneration of the absorption liquid in FIG. 3, the entire amount of the exhaust heat fluid supplied from the exhaust heat fluid supply pipe 30 flows into the bypass pipe 31 and bypasses the heat transfer pipe 3A. It is controlled and a general double effect operation is performed in which the exhaust heat regenerator 3 does not function.

  That is, in this case, the absorption liquid pumps 11 to 13 are operated, and the gas burner 1 </ b> A burns natural gas or the like and a predetermined amount of heat is input to the high-temperature regenerator 1. Therefore, the refrigerant that has been absorbed by the absorber 7 and reduced in concentration and accumulated in the absorption liquid reservoir is regenerated at a high temperature via the low-temperature heat exchanger 8, the exhaust heat regenerator 3, and the high-temperature heat exchanger 9. In the high-temperature regenerator 1, it is heated by the gas burner 1A and boiled, and the refrigerant is evaporated and separated to be concentrated.

  The refrigerant vapor separated and generated from the absorption liquid in the high temperature regenerator 1 enters the low temperature regenerator 2 through the refrigerant pipe 24 and heats the absorption liquid flowing in from the high temperature regenerator 1 via the high temperature heat exchanger 9. Condenses and enters condenser 4. The refrigerant vapor separated and generated from the absorption liquid in the low-temperature regenerator 2 enters the condenser 4, is cooled by the cooling water flowing in the cooling water pipe 33, is condensed and liquefied, and is condensed and flows into the low-temperature regenerator 2. Together with the liquid, it passes through the refrigerant pipe 26 and enters the evaporator 6.

  The refrigerant liquid that has entered the evaporator 6 is dispersed on the heat transfer pipe 6A by the operation of the refrigerant pump 10, and is evaporated by exchanging heat with water flowing inside the heat transfer pipe 6A. The water flowing in the heat transfer pipe 6A is cooled by the heat of vaporization when the refrigerant evaporates, and the cold water is circulated and supplied to the heat load via the cold / hot water pipe 32.

  The refrigerant evaporated in the evaporator 6 enters the absorber 7 and is absorbed and dispersed from above, that is, the refrigerant is separated and generated by heating in the low-temperature regenerator 2, and the concentration becomes higher via the absorption liquid pipe 21. It is absorbed by the absorption liquid flowing in from the low temperature regenerator 2. Then, the absorbing liquid whose concentration is reduced by absorbing the refrigerant is returned to the high temperature regenerator 1 via the low temperature heat exchanger 8, the exhaust heat regenerator 3, and the high temperature heat exchanger 9 as described above. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.

  On the other hand, at the time of cooling operation such as cooling, the temperature of the exhaust heat fluid supplied to the heat transfer tube 3A as the heat source via the exhaust heat fluid supply tube 30 is higher than, for example, a predetermined temperature of 70 ° C. and the heat load is small. When a sufficient amount of refrigerant can be generated with only the exhaust heat fluid supplied to the heat transfer pipe 3A via the exhaust heat fluid supply pipe 30, the refrigerant is separated and generated only by heating the absorbing liquid with the exhaust heat fluid, and the gas burner 1A Refrigerant separation / generation and absorption / concentration regeneration are not performed.

  Therefore, the absorption liquid pumps 11 and 13 are operated, but the operation of the absorption liquid pump 12 is stopped. Then, the refrigerant is absorbed by the absorber 7, and the absorption liquid that has been reduced in concentration and accumulated in the absorption liquid reservoir is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8, and the exhaust heat fluid supply pipe 30. Is heated by the exhaust heat fluid supplied to the heat transfer tube 3A, and the refrigerant is separated and generated from the absorption liquid. The refrigerant vapor separated and generated in the exhaust heat regenerator 3 enters the exhaust heat condenser 5 and is cooled by the cooling water flowing in the cooling water pipe 33 to be condensed and liquefied. Then, the refrigerant vapor passes through the refrigerant pipes 27 and 26 to the evaporator 6. enter.

  In the evaporator 6, the refrigerant liquid is sprayed on the heat transfer pipe 6 </ b> A by the operation of the refrigerant pump 10 as in the double effect operation. Then, the refrigerant exchanges heat with the water flowing in the heat transfer pipe 6A and evaporates, the water flowing in the heat transfer pipe 6A is cooled by the heat of vaporization of the refrigerant, and the cold water is circulated and supplied to the heat load via the cold / hot water pipe 32. Is done.

  The refrigerant evaporated in the evaporator 6 enters the absorber 7 and is absorbed and dispersed from above, that is, the refrigerant is separated and generated by heating in the exhaust heat regenerator 3, and the concentration becomes high, and the absorbing liquid tubes 19, 22, 21. And is absorbed by the absorption liquid flowing from the low-temperature regenerator 2 through the low-temperature heat exchanger 8. Then, the absorption liquid whose concentration is reduced by absorbing the refrigerant is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 by the operation of the absorption liquid pump 11 as described above. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.

  Further, during cooling operation such as cooling, the temperature of the exhaust heat fluid supplied to the heat transfer pipe 3A as the heat source via the exhaust heat fluid supply pipe 30 is, for example, a predetermined 70 ° C. or more, but the exhaust heat is exhausted due to a large heat load. When a sufficient amount of refrigerant cannot be generated with only the exhaust heat fluid supplied to the heat transfer pipe 3A via the fluid supply pipe 30, the absorption liquid is heated using both the exhaust heat fluid and the combustion heat generated by the gas burner 1A. Is separated and produced, and the absorbent is concentrated and regenerated.

  In this case, the absorption liquid pumps 11 to 13 are operated. Therefore, the absorbing liquid that has absorbed the refrigerant in the absorber 7 and has been reduced in concentration and accumulated in the absorbing liquid reservoir is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 and heated, and from the absorbing liquid. A refrigerant is separated and generated. Then, the refrigerant vapor generated in the exhaust heat regenerator 3 enters the exhaust heat condenser 5 and is cooled by the cooling water flowing in the cooling water pipe 33 to be condensed and liquefied, and then the evaporator via the refrigerant pipes 27 and 26. Enter 6.

  The absorption liquid whose concentration has been increased by separating a part of the refrigerant in the exhaust heat regenerator 3 is sent to the high temperature regenerator 1 via the high temperature heat exchanger 9 by the operation of the absorption liquid pump 12. Also in the high temperature regenerator 1, the absorption liquid is heated and the refrigerant evaporates, and the separated refrigerant and the concentrated absorption liquid circulate in the same manner as in the double effect single operation. The refrigerant liquid flowing in from above is sprayed on the heat transfer pipe 6A by the operation of the refrigerant pump 10, the water flowing in the heat transfer pipe 6A is cooled by the heat of vaporization when the refrigerant liquid evaporates, and the cold water passes through the cold / hot water pipe 32. Circulated to the heat load.

The refrigerant evaporated in the evaporator 6 enters the absorber 7 and is absorbed and dispersed from above, that is, the refrigerant is separated and generated by heating in the low-temperature regenerator 2, and the concentration becomes higher via the absorption liquid pipe 21. It is absorbed by the absorbing liquid flowing from the low temperature regenerator 2. Then, the absorption liquid whose concentration is reduced by absorbing the refrigerant is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 by the operation of the absorption liquid pump 11 as described above. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.
JP-A-6-341728

  In the absorption refrigerator disclosed in Patent Document 1, it is generated when natural gas or the like is burned by a burner as a heat source that heats the absorption liquid, separates and generates the refrigerant from the absorption liquid, and concentrates and regenerates the absorption liquid. The use of combustion heat and exhaust heat fluid such as high-temperature and high-pressure steam and high-temperature water supplied from a co-generation system, etc. results in high thermal efficiency. Therefore, there is a merit that it is resource saving and the amount of carbon dioxide emission can be reduced.

  However, in the absorption refrigerator disclosed in Patent Document 1, in the operation of separating and generating the refrigerant from the absorbing liquid by using the combustion heat generated when natural gas or the like is burned and concentrating and regenerating the absorbing liquid, Regardless of whether or not the refrigerant is separated and generated using heat and the concentration and regeneration of the absorption liquid are performed, all of the absorption liquid that has passed through the exhaust heat regenerator flows into the high-temperature regenerator to ensure the specified thermal efficiency. However, all of the absorption liquid that has passed through the low temperature regenerator needs to flow into the absorber, but the absorption liquid pipe connecting the absorption liquid discharge port of the exhaust heat regenerator and the high temperature regenerator and the absorption of the low temperature regenerator Since the absorption liquid pipe connecting the liquid discharge port and the absorber is connected, depending on the internal pressure state, a part of the absorption liquid via the exhaust heat regenerator is concentrated in the high temperature regenerator and the low temperature regenerator. The refrigerant is absorbed into the absorber without absorption. Part of the absorption liquid concentrated or regenerated in the low-temperature regenerator flows into the high-temperature regenerator instead of into the absorber, and the absorption liquid in the absorber is insufficient. There was a problem that there was a case that was not exhibited. For this reason, in an absorption refrigerator equipped with an exhaust heat regenerator, it is necessary to configure the absorption liquid so as to circulate through a predetermined device without fail, which has been a problem to be solved.

  In order to solve the above-described problems of the prior art, the present invention heats the absorbing liquid that has absorbed the refrigerant, evaporates and separates the refrigerant, and concentrates and regenerates the absorbing liquid, so that the absorbing liquid is heated to the maximum temperature in the refrigeration cycle. A high-temperature regenerator, a low-temperature regenerator in which the absorption liquid is heated by the refrigerant vapor supplied from the high-temperature regenerator, and an exhaust heat regenerator in which the absorption liquid is heated by the exhaust heat fluid supplied from other equipment In the absorption refrigerator equipped with the above, the exhaust heat regenerator has two outlets for the concentrated and regenerated absorption liquid, which are separated from each other in the vertical direction, and the lower absorption liquid outlet and the high temperature regenerator are connected to the absorption liquid pump. The main feature is that the first absorption liquid pipe is interposed and the upper absorption liquid discharge port and the absorber are connected by the second absorption liquid pipe.

  In the absorption refrigerator of the present invention, the lower absorption liquid discharge port of the exhaust heat regenerator and the high temperature regenerator are connected by a first absorption liquid pipe with an absorption liquid pump interposed therebetween, and the upper absorption liquid discharge port Since the absorber is connected with the second absorbing liquid pipe, the refrigerant is separated from the absorbing liquid by using the combustion heat generated by burning natural gas or the like by the burner provided in the high temperature regenerator, and the absorbing liquid In the operation of concentrating and regenerating the refrigerant, whether or not the refrigerant is separated and generated by using exhaust heat and the absorption liquid is concentrated and regenerated, by operating the absorption liquid pump interposed in the first absorption liquid pipe, All of the absorbent that has entered the exhaust heat regenerator is sent to the high-temperature regenerator from the lower absorbent discharge port.

  In other words, the absorption liquid that absorbs the refrigerant and the concentration of the absorption liquid decreases and is sent from the absorber to the exhaust heat regenerator is returned to the absorber without being concentrated in the high temperature regenerator and the low temperature regenerator. Therefore, the refrigerant absorbing action in the absorber is not weakened.

  In addition, the combustion heat generated by burning natural gas or the like with the burner provided in the high-temperature regenerator is not used, but only the exhaust heat supplied from other equipment is used to separate and generate the refrigerant from the absorbing liquid. In the operation to concentrate and regenerate the refrigerant, by not operating the absorption liquid pump interposed in the first absorption liquid pipe, the refrigerant is sent from the absorber to the exhaust heat regenerator, and the refrigerant is evaporated in the exhaust heat regenerator. All of the separated and concentrated absorbent is returned to the absorber from the upper absorbent outlet.

  That is, the absorption liquid that absorbs the refrigerant and the concentration of the absorption liquid decreases and is sent from the absorber to the exhaust heat regenerator is heated by the exhaust heat to evaporate and separate the refrigerant, and is concentrated and regenerated. Since it is returned to the absorber from the absorption liquid discharge port, a part of the absorption liquid concentrated and regenerated by the exhaust heat regenerator is sent to the high-temperature regenerator, and the absorption liquid sprayed by the absorber is insufficient, thereby absorbing the refrigerant. There is no inconvenience that the predetermined ability cannot be exhibited due to insufficient action.

  As a regenerator that heats the absorption liquid that has absorbed the refrigerant, evaporates and separates the refrigerant, and concentrates and regenerates the absorption liquid, the high-temperature regenerator in which the absorption liquid is heated to the maximum temperature in the refrigeration cycle and the high-temperature regenerator In an absorption refrigerator having a low-temperature regenerator in which the absorption liquid is heated by the refrigerant vapor and an exhaust heat regenerator in which the absorption liquid is heated by the exhaust heat fluid supplied from other equipment, the exhaust heat regenerator Opens two outlets for concentrated and regenerated absorption liquid, and connects the lower absorption liquid outlet and the high-temperature regenerator by a first absorption liquid pipe with an absorption liquid pump interposed between them. An upper absorption liquid outlet and an absorber are connected by a second absorption liquid pipe, and a first absorption liquid pipe, and an absorption liquid pipe connecting the absorption liquid outlet of the low temperature regenerator and the absorber of the absorber, Is an absorption refrigerator that prevents communication.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The absorption refrigerator 100 of the present invention illustrated in the drawings is an absorption refrigeration capable of circulating and supplying cold water or hot water to a heat load (not shown) using water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorption liquid. Machine. In order to facilitate understanding, in these drawings, parts having the same functions as those explained in FIGS. 4 to 6 are denoted by the same reference numerals.

  The absorption chiller 100 of the present invention illustrated in FIGS. 1 to 3 is different from the absorption chiller 100X shown in FIGS. 4 to 6 in that the heat is evaporated in the exhaust heat regenerator 3 to evaporate the refrigerant. The transport destination of the separated and concentrated absorption liquid can be selected.

  That is, in the absorption refrigerator 100X shown in FIG. 4 to FIG. 6, the absorbent outlet 3B is provided in the middle part of the side wall of the exhaust heat regenerator 3, and one end of the absorbent pipe 19 is provided in the outlet 3B. The absorption liquid of the exhaust heat regenerator 3 that is connected and higher than the discharge port 3B can be transported to the high temperature regenerator 1 by the operation of the absorption liquid pump 12 interposed in the absorption liquid pipe 19, and the absorption liquid pump 12 Is stopped and the absorption liquid pump 13 is operated, the absorption liquid in the exhaust heat regenerator 3 at a position higher than the discharge port 3B does not go through the high temperature regenerator 1 but through the absorption liquid pipes 19, 22, and 21. And it is provided in the absorber 7 so that conveyance is possible.

  On the other hand, in the absorption refrigerator 100 of the present invention illustrated in FIGS. 1 to 3, the two discharge ports 3 </ b> B and 3 </ b> C of the absorption liquid are positioned below the heat transfer tube 3 </ b> A in the exhaust heat regenerator 3, and The upper discharge port 3B is connected to the other end of the absorption liquid pipe 19A, one end of which is connected to the low temperature regenerator 2 side of the absorption liquid pipe 21, and the lower discharge port 3C. An absorption liquid pump 19 is interposed, and one end of an absorption liquid pipe 19 having the other end connected to the high-temperature regenerator 1 is connected.

  In the absorption refrigerator 100 of the present invention having the above-described configuration, the exhaust heat fluid supply is performed when the cold water cooled by the heat transfer pipe 6A is circulated and supplied to the heat load through the cold / hot water pipe 32 to perform cooling operation such as cooling. The temperature of the exhaust heat fluid supplied from other equipment as a heat source to the heat transfer tube 3A in the exhaust heat regenerator 3 via the tube 30 is lower than, for example, a predetermined temperature of 70 ° C., and refrigerant generation in the exhaust heat regenerator 3 When the absorption liquid cannot be used for concentration regeneration, the flow control valve 14 is controlled so that the entire amount of the exhaust heat fluid supplied from the exhaust heat fluid supply pipe 30 flows into the bypass pipe 31 and bypasses the heat transfer pipe 3A. A general double-effect operation in which the heat regenerator 3 does not function is performed.

  That is, in this case, the absorption liquid pumps 11 to 13 are operated, and the gas burner 1 </ b> A burns natural gas or the like and a predetermined amount of heat is input to the high-temperature regenerator 1. Therefore, the refrigerant that has been absorbed by the absorber 7 and reduced in concentration and accumulated in the absorption liquid reservoir is regenerated at a high temperature via the low-temperature heat exchanger 8, the exhaust heat regenerator 3, and the high-temperature heat exchanger 9. In the high-temperature regenerator 1, it is heated by the gas burner 1A and boiled, and the refrigerant is evaporated and separated to be concentrated.

  In addition, since the effect | action of a refrigerant | coolant and the path | route through which it circulates are the same as the case of the said conventional absorption refrigerator 100X, below, it mainly describes the circulation of absorption liquid.

  The absorbing liquid sent from the absorber 7 to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 is operated from the lower discharge port 3C via the high-temperature heat exchanger 9 by the operation of the absorbing liquid pump 12. It is sent to the high-temperature regenerator 1, heated by the gas burner 1A and boiled, and concentrated by evaporating and separating the refrigerant.

  In the low temperature regenerator 2, the absorption liquid that has flowed in from the high temperature regenerator 1 via the high temperature heat exchanger 9 is heated by the refrigerant vapor supplied from the high temperature regenerator 1 via the refrigerant pipe 24 to be concentrated and regenerated. Then, the regenerated absorption liquid is sent to the absorber 7 via the low-temperature heat exchanger 8 by the operation of the absorption liquid pump 13 and sprayed from above.

  Then, the evaporator 6 evaporates by exchanging heat with the water flowing inside the heat transfer tube 6 </ b> A, absorbs the refrigerant that has entered the absorber 7, and the absorption liquid concentration is reduced by the operation of the absorption liquid pump 11. It is sent to the exhaust heat regenerator 3. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.

  Moreover, the absorption liquid pipe 19 connecting the absorption liquid discharge port of the exhaust heat regenerator 3 and the high temperature regenerator 1 and the absorption liquid pipe 21 connecting the absorption liquid discharge port of the low temperature regenerator 2 and the absorber 7 are as follows. Since there is no communication, a part of the absorption liquid that has passed through the exhaust heat regenerator 3 does not pass through the high temperature regenerator 1 and the low temperature regenerator 2, that is, is not concentrated between the high temperature regenerator 1 and the low temperature regenerator 2. In the absorber 7, the absorption of the refrigerant by the absorbing liquid is weakened, or a part of the absorbing liquid concentrated and regenerated in the low temperature regenerator 2 flows into the high temperature regenerator 1 instead of the absorber 7, and is absorbed. There is no inconvenience that the absorbing liquid sprayed by the vessel 7 is insufficient, the refrigerant absorbing action is insufficient, and the predetermined ability is not exhibited.

  Further, at the time of cooling operation such as cooling, the temperature of the exhaust heat fluid supplied to the heat transfer tube 3A via the exhaust heat fluid supply tube 30 as a heat source is higher than a predetermined temperature of 70 ° C., for example, and the heat load is small. When a sufficient amount of refrigerant can be generated with only the exhaust heat fluid supplied to the heat transfer pipe 3A via the exhaust heat fluid supply pipe 30, the refrigerant is separated and generated only by heating the absorbing liquid with the exhaust heat fluid, and the gas burner 1A Refrigerant separation / generation and absorption / concentration regeneration are not performed.

  Therefore, the absorption liquid pumps 11 and 13 are operated, but the operation of the absorption liquid pump 12 is stopped. Then, the refrigerant is absorbed by the absorber 7, and the absorption liquid that has been reduced in concentration and accumulated in the absorption liquid reservoir is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8, and the exhaust heat fluid supply pipe 30. Is heated by the exhaust heat fluid supplied to the heat transfer tube 3A, and the refrigerant is separated and generated from the absorption liquid.

  The absorption liquid heated and condensed and regenerated by the exhaust heat regenerator 3 in the exhaust heat regenerator 3 passes through the absorption liquid pipes 19A and 21 from the upper discharge port 3B and is sent to the absorber 7 via the low-temperature heat exchanger 8. And sprayed from above. Then, the evaporator 6 evaporates by exchanging heat with the water flowing inside the heat transfer tube 6 </ b> A, absorbs the refrigerant that has entered the absorber 7, and the absorption liquid concentration is reduced by the operation of the absorption liquid pump 11. It is sent to the exhaust heat regenerator 3. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.

  Moreover, the absorption liquid pipe 19 connecting the absorption liquid discharge port of the exhaust heat regenerator 3 and the high temperature regenerator 1 and the absorption liquid pipe 21 connecting the absorption liquid discharge port of the low temperature regenerator 2 and the absorber 7 are as follows. Since it is not in communication, all of the absorption liquid concentrated and regenerated by the exhaust heat regenerator 3 is sent to the absorber 7. Therefore, there is no inconvenience that the absorbing liquid sprayed by the absorber 7 is insufficient, the refrigerant absorbing action is insufficient, and the predetermined ability is not exhibited.

  Further, during cooling operation such as cooling, the temperature of the exhaust heat fluid supplied to the heat transfer pipe 3A as the heat source via the exhaust heat fluid supply pipe 30 is, for example, a predetermined 70 ° C. or more, but the exhaust heat is exhausted due to a large heat load. When a sufficient amount of refrigerant cannot be generated with only the exhaust heat fluid supplied to the heat transfer pipe 3A via the fluid supply pipe 30, the absorption liquid is heated using both the exhaust heat fluid and the combustion heat generated by the gas burner 1A. Is separated and produced, and the absorbent is concentrated and regenerated.

  In this case, the absorption liquid pumps 11 to 13 are operated. Therefore, the absorbing liquid that has absorbed the refrigerant in the absorber 7 and has been reduced in concentration and accumulated in the absorbing liquid reservoir is sent to the exhaust heat regenerator 3 via the low-temperature heat exchanger 8 and heated, and from the absorbing liquid. A refrigerant is separated and generated.

  The absorption liquid whose concentration has been increased by separating a part of the refrigerant in the exhaust heat regenerator 3 passes from the lower discharge port 3C to the high temperature regenerator 1 via the high temperature heat exchanger 9 by the operation of the absorption liquid pump 12. Sent. Also in the high-temperature regenerator 1, the absorption liquid is heated and the refrigerant evaporates, and the separated refrigerant and the concentrated absorption liquid circulate in the same manner as in the double effect single operation.

  That is, the absorption liquid concentrated in the high-temperature regenerator 1 enters the low-temperature regenerator 2 via the high-temperature heat exchanger 9 and is concentrated and regenerated by heating with the refrigerant vapor supplied from the high-temperature regenerator 1, It is sent to the absorber 7 via the exchanger 8 and sprayed from above.

  Then, the evaporator 6 evaporates by exchanging heat with the water flowing inside the heat transfer tube 6 </ b> A, absorbs the refrigerant that has entered the absorber 7, and the absorption liquid concentration is reduced by the operation of the absorption liquid pump 11. It is sent to the exhaust heat regenerator 3. That is, the absorption liquid in the machine circulates in the direction of the arrow shown in each absorption liquid pipe in FIG.

  Moreover, the absorption liquid pipe 19 connecting the absorption liquid discharge port of the exhaust heat regenerator 3 and the high temperature regenerator 1 and the absorption liquid pipe 21 connecting the absorption liquid discharge port of the low temperature regenerator 2 and the absorber 7 are as follows. Since there is no communication, a part of the absorption liquid that has passed through the exhaust heat regenerator 3 does not pass through the high temperature regenerator 1 and the low temperature regenerator 2, that is, is not concentrated between the high temperature regenerator 1 and the low temperature regenerator 2. In the absorber 7, the absorption of the refrigerant by the absorbing liquid is weakened, or a part of the absorbing liquid concentrated and regenerated in the low temperature regenerator 2 flows into the high temperature regenerator 1 instead of the absorber 7, and is absorbed. There is no inconvenience that the absorbing liquid sprayed by the vessel 7 is insufficient, the refrigerant absorbing action is insufficient, and the predetermined ability is not exhibited.

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

  For example, the refrigerant pipe 29 in which the on-off valve 17 is interposed may be provided between the downstream side of the refrigerant pump 10 and the absorber 7.

  Further, the heat transfer tube 3A installed in the exhaust heat regenerator 3 is discharged similarly to the conventional absorption refrigerator 100X shown in FIG. 4 and the like, that is, buried in the absorption liquid supplied from the absorber 7. It may be provided below the outlets 3B and 3C.

It is explanatory drawing of the absorption refrigerator of this invention, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of the independent heating operation by combustion heat. It is explanatory drawing of the absorption refrigerator of this invention, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of the independent heating operation by waste heat. It is explanatory drawing of the absorption refrigerator of this invention, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of the combined heating operation of combustion heat and exhaust heat. It is explanatory drawing of the conventional absorption refrigerator, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of the independent heating operation by combustion heat. It is explanatory drawing of the conventional absorption refrigerator, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of the independent heating operation by waste heat. It is explanatory drawing of the conventional absorption refrigerator, and is explanatory drawing which showed the circulation path of the absorption liquid at the time of combined heating operation of combustion heat and exhaust heat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High temperature regenerator 1A Gas burner 2 Low temperature regenerator 3 Exhaust heat regenerator 3A Heat transfer tube 3B, 3C Discharge port 4 Condenser 5 Exhaust heat condenser 6 Evaporator 6A Heat transfer tube 7 Absorber 8 Low temperature heat exchanger 9 High temperature heat exchanger 10 Refrigerant pump 11-13 Absorption liquid pump 14 Flow control valve (three-way valve)
15-17 On-off valve 18-23 Absorption liquid pipe 24-29 Refrigerant pipe 30 Waste heat fluid supply pipe 31 Bypass pipe 32 Cold / hot water pipe 33 Cooling water pipe 100, 100X Absorption refrigerator

Claims (1)

  As a regenerator that heats the absorption liquid that has absorbed the refrigerant, evaporates and separates the refrigerant, and concentrates and regenerates the absorption liquid, the high-temperature regenerator in which the absorption liquid is heated to the maximum temperature in the refrigeration cycle and the high-temperature regenerator In an absorption refrigerator having a low-temperature regenerator in which the absorption liquid is heated by the refrigerant vapor and an exhaust heat regenerator in which the absorption liquid is heated by the exhaust heat fluid supplied from other equipment, the exhaust heat regenerator Opens two outlets for concentrated and regenerated absorption liquid, and connects the lower absorption liquid outlet and the high-temperature regenerator by a first absorption liquid pipe with an absorption liquid pump interposed between them. An absorption refrigerator comprising an upper absorption liquid discharge port and an absorber connected by a second absorption liquid pipe.

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