JP3851837B2 - Waste heat recovery type absorption refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a storage section for storing the refrigerant solution at the bottom of the can body whose inside is a vacuum space, and the refrigerant solution stored in the storage section is heated by the heating section to generate the refrigerant solution and the refrigerant vapor. A high-temperature regenerator to be separated; a low-temperature regenerator that heats the refrigerant solution sent from the high-temperature regenerator by the refrigerant vapor sent from the high-temperature regenerator; and the refrigerant vapor that has passed through the low-temperature regenerator is cooled. A condenser for condensing, an evaporator for evaporating the refrigerant liquid obtained in the condenser, and an absorber for absorbing the refrigerant vapor generated in the evaporator with the refrigerant solution sent from the low-temperature regenerator. The present invention relates to an exhaust heat recovery type absorption refrigerator that is provided.
[0002]
[Prior art]
The absorption refrigerator uses a refrigerant solution of an absorbent and a refrigerant. As shown in FIG. 2, the low-concentration refrigerant solution is heated by a heating unit 8 and a high-temperature medium-concentration refrigerant solution and refrigerant vapor are used. A low-temperature regenerator 2 that heats the medium-concentration refrigerant solution sent from the high-temperature regenerator 1 with the refrigerant vapor sent from the high-temperature regenerator 1 to obtain a high-concentration refrigerant solution, The condenser 3 that cools and condenses the refrigerant vapor that has passed through the low-temperature regenerator 2, the evaporator 4 that evaporates the refrigerant liquid obtained by the condenser 3, and the refrigerant vapor generated in the evaporator 4 is sent from the low-temperature regenerator 2. Absorber 5 that is absorbed with the high-concentration refrigerant solution that has been diluted to obtain a low-concentration refrigerant solution, low-concentration refrigerant solution that is sent from absorber 5 to high-temperature regenerator 1, and low-temperature regenerator 2 that is sent to absorber 5 Low-temperature heat exchanger 6 that exchanges heat with the high-concentration refrigerant solution produced, low A low concentration refrigerant solution having passed through the heat exchanger 6, high temperature heat exchanger 7 for heat exchange and concentration refrigerant solution in sent from the high temperature regenerator 1 to the low-temperature regenerator 2, and includes a city.
[0003]
Inside the evaporator 4, there are provided a first watering device 19 that can spray the refrigerant liquid sent from the condenser 3, and a water circulation pipe through which water circulates. The resulting refrigerant liquid takes the heat of vaporization from the water flowing in the water flow pipe and evaporates to cool the water, so that cold water is produced, and the produced cold water is used for cooling and the like. .
[0004]
When a combustion system such as an incinerator is installed in the vicinity of the absorption refrigerator described above, the heat energy of the high-temperature exhaust gas discharged from the combustion system is used to save the heating energy of the refrigerant solution. There is.
[0005]
For example, as shown in FIG. 2, a low concentration that is heated using hot water that can indirectly perform heat exchange between the low-concentration refrigerant solution discharged from the absorber 5 and flowing into the high-temperature regenerator 1 and the exhaust gas. By flowing the refrigerant solution into the high temperature regenerator 1, heating energy may be saved when the refrigerant solution stored in the high temperature regenerator 1 is heated.
That is, the first hot water heat exchange section 51 that enables heat exchange between the exhaust gas discharged from the combustion system and the hot water is provided in the middle of the exhaust gas pipe 50 through which the exhaust gas flows, and is discharged from the absorber 5 and the high temperature regenerator 1. A second hot water heat exchanging section 52 that enables heat exchange between the low-concentration refrigerant solution flowing into the hot water and the hot water is provided. And while providing the 1st warm water pipe 53 into which warm water flows into the said 2nd warm water heat exchange part 52 from the said 1st warm water heat exchange part 51, the said 1st warm water heat exchange part 51 is said 1st warm water heat exchange part 51. A second hot water pipe 54 through which hot water flows is provided, and a hot water pump 55 is provided in the middle of the second hot water pipe 54 for forming a flow in the hot water pipe.
However, since the above-mentioned exhaust heat recovery type absorption refrigerator employs an indirect heat exchange method, it is difficult to avoid heat energy loss, and heat exchange between exhaust gas and refrigerant solution must be performed efficiently. I couldn't. Furthermore, since the warm water temperature in the first warm water pipe 53 and the second warm water pipe 54 is 100 ° C. or less, the temperature rise of the refrigerant solution was relatively low.
[0006]
Therefore, by directly exchanging heat between the low concentration refrigerant solution discharged from the absorber 5 and flowing into the high temperature regenerator 1 and the exhaust gas, the heated low concentration refrigerant solution is allowed to flow into the high temperature regenerator 1, An exhaust heat recovery type absorption refrigerator that conserves heating energy for heating the refrigerant solution stored in the high-temperature regenerator 1 has been considered. That is, as shown in FIG. 3, an exhaust gas heat exchange section 60 that enables heat exchange between the exhaust gas discharged from the combustion system and the low-concentration refrigerant solution discharged from the absorber 5 is provided from the absorber 5 to the high-temperature regenerator. 1 is provided in the middle of the pipe through which the refrigerant solution flows, and the first exhaust gas pipe 61 through which the exhaust gas flows into the exhaust gas heat exchange unit 60, and the exhaust gas from the exhaust gas heat exchange unit 60 to an exhaust gas purification device (not shown) And a second exhaust pipe 62 that can discharge the gas.
[0007]
Here, when the operation of the exhaust heat recovery type absorption refrigerator is stopped, not only the heating of the heating unit 8 is stopped, but also the exhaust gas is stopped from exchanging heat with the refrigerant solution. Therefore, in such a case, the exhaust gas from the combustion system is discharged from the first branch portion B1 in the middle of the first exhaust gas pipe 61 in order to exhaust the exhaust gas from the combustion system through another route without passing through the exhaust gas heat exchanging portion 60. A third exhaust pipe 63 that merges at the second branch B2 in the middle of the two exhaust pipes 62 is provided, and a damper D3 is provided between the first branch B1 and the exhaust heat exchanger 60 in the first exhaust pipe 61, Between the second branch part B2 and the exhaust gas heat exchange part 60 in the second exhaust gas pipe 62, between the damper D4 and the first branch part B1 and the second branch part B2 in the third exhaust gas pipe 63. Damper D5 was provided. In the operation stop state, the damper D3 and the damper D4 are closed and the damper D5 is opened so that the exhaust gas purifier can be discharged.
[0008]
[Problems to be solved by the invention]
In the exhaust heat recovery type absorption refrigerator as described above, the exhaust gas temperature in the heat exchange section is about 200 ° C., the refrigerant solution temperature flowing into the high temperature regenerator is about 130 ° C., and the refrigerant solution in the high temperature regenerator Since the temperature is about 150 ° C., the exhaust heat recovery heat amount is limited to a heat amount corresponding to about 50 to 70 ° C. which is a temperature difference from the exhaust gas.
Moreover, as shown in FIGS. 2-3, the heat exchange part which performs heat recovery becomes large.
On the other hand, the temperature of the exhaust gas flowing in the exhaust gas pipe reaches about 200 to 500 ° C., and it is extremely dangerous if high-temperature exhaust gas leaks. Exhaust gas leakage is highly likely to occur from the damper portion of the exhaust gas pipe, and therefore, design of the damper portion of the exhaust gas pipe requires high airtightness.
Furthermore, the properties of the exhaust gas discharged from the combustion system may vary depending on the properties of the object combusted in the combustion system, and corrosive gas may be generated. There was a need to prevent degradation due to. In order to ensure the airtightness of the damper part of the exhaust gas pipe, it is necessary to periodically inspect, leading to an increase in running cost. Moreover, manufacturing a damper portion having high airtightness has led to an increase in the manufacturing cost of the exhaust heat recovery type absorption refrigerator.
[0009]
Accordingly, an object of the present invention is to utilize exhaust gas discharged from a combustion system, and to efficiently perform heat exchange when heating the refrigerant solution by directly exchanging heat between the exhaust gas and the refrigerant solution. It is an object of the present invention to provide an exhaust heat recovery type absorption chiller that can prevent leakage of air with a simple structure.
[0010]
[Means for Solving the Problems]
[Configuration 1]
Characterizing feature of the present invention for achieving this objective, as described in claim 1,
A high-temperature regeneration that has a storage part for storing the refrigerant solution at the bottom part of the can whose inside is a vacuum space, and separates the refrigerant solution and the refrigerant vapor by heating the refrigerant solution stored in the storage part by the heating part , A low-temperature regenerator that heats the refrigerant solution sent from the high-temperature regenerator with the refrigerant vapor sent from the high-temperature regenerator, and a condensation that cools and condenses the refrigerant vapor that has passed through the low-temperature regenerator And an evaporator for evaporating the refrigerant liquid obtained in the condenser, and an absorber for absorbing the refrigerant vapor generated in the evaporator with the refrigerant solution sent from the low temperature regenerator. Exhaust heat recovery type absorption refrigerator,
In the can of the high-temperature regenerator, there are provided a heat transfer tube through which exhaust gas circulates and a spraying portion for spraying a refrigerant solution to the heat transfer tube, and the refrigerant solution from the absorber flows into the storage portion. One refrigerant solution supply path and a second refrigerant solution supply path through which the refrigerant solution from the absorber flows into the spraying unit are provided. When the refrigerator is operated, the second refrigerant solution supply path is provided in the second refrigerant solution supply path. And the valve provided in the first refrigerant solution supply path is closed, and the refrigerant solution from the absorber is caused to flow into the spraying section via the second refrigerant solution supply path, When stopping the operation, the valve provided in the first refrigerant solution supply path is opened, the valve provided in the second refrigerant solution supply path is closed, and the refrigerant solution from the absorber is supplied to the first refrigerant solution. this to be introduced into the reservoir via the solution supply path Located in.
[0011]
[Operation effect 1]
In other words, the high-temperature regenerator has a storage unit that stores a refrigerant solution of the absorbent and the refrigerant at the bottom of the can body whose inside is a vacuum space, and heats the refrigerant solution stored in the storage unit. A heating unit that generates the refrigerant vapor, the low-concentration refrigerant solution is heated by the heating unit to separate the high-temperature medium-concentration refrigerant solution and the refrigerant vapor, and in the low-temperature regenerator, The medium concentration refrigerant solution sent from the regenerator is heated by the refrigerant vapor sent from the high temperature regenerator to obtain a high concentration refrigerant solution, and the refrigerant vapor that has passed through the low temperature regenerator in the condenser is cooled. Then, the refrigerant liquid obtained by the condenser is evaporated in the evaporator, and the refrigerant vapor generated in the evaporator is absorbed by the high-concentration refrigerant solution sent from the low-temperature regenerator in the absorber. Let me Obtain a low density refrigerant solution is interpreted.
Here, in the evaporator, when the refrigerant liquid obtained in the condenser evaporates, it takes heat of vaporization, so that cold water or the like can be produced, and the produced cold water is used for cooling or the like.
[0012]
The can of the high-temperature regenerator is provided with a heat transfer pipe through which exhaust gas circulates and a spraying section for spraying a refrigerant solution to the heat transfer pipe, and the refrigerant solution from the absorber flows into the storage section. A first refrigerant solution supply path, and a second refrigerant solution supply path through which the refrigerant solution from the absorber flows into the spraying section, and the second refrigerant solution supply path when the refrigerator is operated. Open the valve provided in the first refrigerant solution supply path and close the valve provided in the first refrigerant solution supply path, the refrigerant solution from the absorber flows into the spraying section via the second refrigerant solution supply path, Heat exchange between the refrigerant solution from the absorber and the exhaust gas flowing through the heat transfer tube is possible. That is, the exhaust gas temperature flowing through the heat transfer tube is about 200 ° C., and the refrigerant solution sent from the absorber is about 130 ° C., so the exhaust heat recovery heat quantity is about 70 ° C., which is the temperature difference from the exhaust gas. Corresponding heat amount, and the recovered heat amount increases. In other words, it can be efficiently heat exchange as compared with traditional heat recovery type absorption refrigerator, a result of the heat exchange, because the refrigerant solution is heated, can save the thermal energy of the heating unit.
As a result of the heat exchange is performed between the refrigerant solution and the exhaust gas, the thermal energy of the exhaust gas is deprived of the heat energy to raise the temperature of the coolant solution, the temperature of the exhaust gas that is released into the atmosphere, the heat transfer tube It is lower than the temperature of the exhaust gas discharged without going through.
Further, as a technique for recovering thermal energy of high-temperature exhaust gas, there is a technique for recovering heat as combustion air preheating. In this case, since the air preheater is increased in size, there is a problem that a large site is required for installation together with the exhaust heat recovery type absorption refrigerator in actual use. However, as in the present invention, lever is heat energy refrigerant solution and heat exchange of hot exhaust gas, without requiring a large-scale apparatus for heat exchange, efficient than more heat recovery as combustion air preheat Thermal energy can be recovered.
[0013]
When stopping the exhaust heat recovery type absorption refrigerator of the present invention, the valve provided in the first refrigerant solution supply path is opened, the valve provided in the second refrigerant solution supply path is closed, and the absorber Since the refrigerant solution from the refrigerant flows into the storage part via the first refrigerant solution supply path, that is, the refrigerant solution from the absorber does not flow into the spraying part, the heat exchange between the exhaust gas and the refrigerant solution is stopped. Ru is. At this time, since the path through which the exhaust gas flows is not switched, there is no possibility of exhaust gas leakage from the damper portion due to the provision of the path switching portion. In other words, it is not necessary to manufacture a highly airtight damper part in the exhaust gas pipe, and there is no need for measures to prevent deterioration due to corrosion of the damper part or periodic inspections. An exhaust heat recovery type absorption refrigerator having a small and simple structure that can be suppressed can be provided.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.
The exhaust heat recovery type absorption refrigerator of the present invention is shown in FIG. In addition, the exhaust heat recovery type absorption refrigerator of the present invention uses water as a refrigerant and lithium bromide (LiBr) as an absorbent. In the refrigerant vapor, water corresponds to the refrigerant liquid.
[0018]
The low-concentration lithium bromide aqueous solution (57 to 58%) that has flowed in the high-temperature regenerator 1 is heated by the heating unit 8, and the medium-concentration lithium bromide aqueous solution (60 to 61%) at high temperature (150 to 160 ° C), water vapor, Isolate. The separated medium-concentration lithium bromide aqueous solution is sent to the low-temperature regenerator 2 via the high-temperature heat exchanger 7 and heated by the water vapor sent from the high-temperature regenerator 1 to be high-concentration bromide at about 90 ° C. It becomes a lithium aqueous solution (62 to 64%). This high-concentration lithium bromide aqueous solution flows out to the exhaust gas heat exchanger 28, exchanges heat with the exhaust gas, becomes a gas-liquid two-phase flow, and is sent to a flash tank which is a gas-liquid phase separation device 29. In the flash tank, water vapor as a gas phase and a high concentration lithium bromide aqueous solution as a liquid phase are separated. The water vapor separated in the flash tank, the water vapor generated in the high-temperature regenerator 1 and passed through the low-temperature regenerator 2 and the water vapor generated in the low-temperature regenerator are cooled and condensed in the condenser 3 to be about 40 ° C. water. (Saturated water). The water obtained in the condenser 3 is sent to the evaporator 4 where it is evaporated. The water vapor generated in the evaporator 4 is sent to an absorber 5 where it is absorbed and diluted with a high concentration lithium bromide aqueous solution sent from the flash tank to form a low concentration lithium bromide aqueous solution.
The low-concentration lithium bromide aqueous solution exchanges heat with the high-concentration lithium bromide aqueous solution sent from the flash tank by the low-temperature heat exchanger 6, and is sent from the high-temperature regenerator 1 by the high-temperature heat exchanger 7. During the heat exchange with the concentrated lithium bromide aqueous solution again, the temperature is raised to about 130 ° C. and sent to the high temperature regenerator 1.
The high temperature regenerator 1 and the exhaust gas heat exchanger 28 both use a liquid pipe structure or a smoke pipe structure.
[0019]
The high-concentration lithium bromide aqueous solution flowing into the exhaust gas heat exchanger 28 is about 90 ° C. at this time, and the exhaust gas temperature flowing into the exhaust gas heat exchanger 28 is about 200 ° C. The amount of heat corresponding to a temperature difference of about 110 ° C. between the high concentration lithium bromide aqueous solution and the exhaust gas is heat exchanged. As a result, the high concentration lithium bromide aqueous solution is heated.
At this time, the high-concentration lithium bromide aqueous solution flowing out of the exhaust gas heat exchanger 28 is in a gas-liquid two-phase flow state, flows into the flash tank, and is separated into water vapor and the high-concentration lithium bromide aqueous solution. The high-concentration lithium bromide aqueous solution is concentrated and increases in concentration due to the generation of water vapor accompanying the temperature rise due to heat exchange in the exhaust gas heat exchanger 28. Therefore, the absorber 5 passes through the flash tank with the absorption capacity increased. Sent to. On the other hand, water vapor is sent to the low temperature regenerator 2.
Further, by adding the flash tank to the exhaust heat recovery type absorption refrigerator, the coefficient of performance (COP) is improved by 5 to 10%.
[0020]
The high-temperature regenerator 1 has a storage unit 15 for storing a lithium bromide aqueous solution at the bottom of a can body 14 whose inside is a vacuum space, and heats the lithium bromide aqueous solution stored in the storage unit 15. And a heating unit 8 for generating water vapor. The heating unit 8 includes a burner 9 as a heating device and a combustion chamber 10, and a combustion exhaust gas outlet 11 for discharging the combustion exhaust gas of the burner 9 is provided in the combustion chamber 10. The combustion exhaust gas discharge port 11 can be combined with exhaust gas discharged from a combustion system such as an incinerator, and the combined exhaust gas is sent to the heat transfer tube 12.
[0021]
In the vacuum space of the high-temperature regenerator 1, a heat transfer tube 12 through which exhaust gas flows is provided, and a spraying unit for spraying a low concentration lithium bromide aqueous solution to the heat transfer tube 12 above the heat transfer tube 12. 13 is provided. A shielding case 23 for housing the spray port for spraying the refrigerant solution of the spray unit 13 and the heat transfer tube 12 is provided in the vacuum space inside the can body 14. The shape of the shielding case 23 is a rectangular parallelepiped shape, but is not particularly limited to this shape. Here, the temperature of the refrigerant vapor generated by warming the refrigerant solution stored in the storage unit in the heating unit is lower than the temperature of the exhaust gas flowing through the heat transfer tube, but is sprayed from the spray unit. Higher than the temperature of the refrigerant solution. In other words, by providing a shielding case for housing the spraying section and the heat transfer tube inside the can body, the refrigerant solution supplied from the spraying section performs heat exchange with the exhaust gas flowing through the heat transfer pipe. Heat exchange with the refrigerant vapor can be prevented, and the heat exchange efficiency between the lithium bromide aqueous solution and the exhaust gas can be improved.
That is, by spraying the low-concentration lithium bromide aqueous solution of about 130 ° C. sent from the absorber 5 onto the heat transfer tube 12 from the spray portion 13, the temperature of about 200 ° C. circulating in the heat transfer tube 12 is increased. Heat exchange with the exhaust gas. The amount of exhaust heat recovered at this time is an amount of heat corresponding to about 70 ° C., which is the temperature difference between the low concentration lithium bromide aqueous solution and the exhaust gas.
[0022]
The upper surface of the shielding case 23 is a refrigerant vapor as an opening through which water vapor generated by the contact of the low-concentration lithium bromide aqueous solution sprayed from the spraying portion 13 with the heat transfer tube 12 can be discharged. A discharge port 24 is provided. In addition, a refrigerant solution discharge port 25 is provided on the lower surface of the shielding case 23 as an opening through which the lithium bromide aqueous solution heated by exchanging heat with the exhaust gas in the heat transfer tube 12 can be discharged. Yes. As a result, the heated lithium bromide aqueous solution is discharged from the refrigerant solution outlet 25 and dropped by gravity and mixed with the intermediate concentration lithium bromide aqueous solution stored in the storage unit 15, thereby saving the heating energy of the burner 9. It can be done.
[0023]
The low-temperature regenerator 2 and the condenser 3 are provided together on one body via a partition. The low-temperature regenerator 2 includes a heater 17 in the body, and the water vapor obtained by the high-temperature regenerator 1 is fed into one end of the heater 17 so that the water vapor that has passed through the heater 17 is condensed. It is to be sent into the vessel 3. The condenser 3 includes a first cooling water circulation pipe 18 in the fuselage, and the steam generated in the low temperature regenerator 2 and the heater 17 by the cooling water flowing through the first cooling water circulation pipe 18. The water vapor sent from is cooled and condensed.
[0024]
The evaporator 4 and the absorber 5 are provided together in one body via a partition. The evaporator 4 includes a first watering device 19 and a second cooling water circulation pipe 20 in the body. Then, the water sent from the condenser 3 is sprayed to the second cooling water circulation pipe 20 by the first water sprinkler 19. The sprayed water takes the heat of vaporization from the water flowing in the second cooling water flow pipe 20 and evaporates to cool the water, thereby producing cold water. The produced cold water is used for cooling and the like. Further, the water collected in the lower part flows down to not evaporate in the evaporator 4, the refrigerant circulation pump 21 from the lower end of the evaporator 4, so as to sent to again the first sprinkler 19 Yes.
[0025]
The absorber 5 includes a second water sprinkler 27 and a third cooling water circulation pipe 22 in the body. Then, a high concentration lithium bromide aqueous solution that has passed through the flash tank and the low-temperature heat exchanger 6 is sprayed on the third cooling water circulation pipe 22 by the second sprinkler 27 to form a liquid film on the surface thereof. The liquid film is cooled with cooling water flowing through the third cooling water flow pipe 22, and water vapor is absorbed by the liquid film to obtain a low-concentration lithium bromide aqueous solution. The low-concentration lithium bromide aqueous solution thus obtained is sent from the absorber 5 to the high-temperature regenerator 1 through the low-temperature heat exchanger 6 and the high-temperature heat exchanger 7. The cooling water that has passed through the third cooling water circulation pipe 22 is sent to the first cooling water circulation pipe 18 of the condenser 3.
[0026]
In the middle of the first pipe P1 from the high temperature heat exchanger 7 to the storage part 15, there is a branch part B, and a second pipe P2 is provided from the branch part B to the spraying part 13. The low-concentration lithium bromide aqueous solution discharged from the absorber 5 passes through the low-temperature heat exchanger 6 in the first pipe P1, and then passes through the high-temperature heat exchanger 7 and the branch portion B to the second. It is introduced into the spraying part 13 via the pipe P2. A first valve V1 is provided between the branch part B and the spraying part 13 in the second pipe P2, and between the branch part B and the storage part 15 in the first pipe P1. Is provided with a second valve V2, and a supply path switching control unit (not shown) for controlling opening and closing of the first valve V1 and the second valve V2 is provided. Between the absorber 5 and the low-temperature heat exchanger 6 in the first pipe P1, a solution circulation pump 16 that forms a flow of a low-concentration lithium bromide aqueous solution is provided.
[0027]
Here, the first refrigerant solution supply path is a path through which the low-concentration lithium bromide aqueous solution flows into the storage unit 15 from the absorber 5 via the first pipe P1. The second refrigerant solution supply path is such that the low-concentration lithium bromide aqueous solution passes from the absorber 5 through the first pipe P1 through the branch part B and through the second pipe P2. It is the path which flows into the.
[0028]
A supply path switching control unit (not shown) that controls switching between the second refrigerant solution supply path and the first refrigerant solution supply path performs the control according to the operating state of the exhaust heat recovery type absorption refrigerator.
That is, when operating the exhaust heat recovery type absorption refrigerator, the first valve V1 is opened and the second valve V2 is opened in order to select the second refrigerant solution supply path by the supply path switching control unit. Close control is performed. Thereby, the low-concentration lithium bromide aqueous solution discharged from the absorber 5 passes through the branch part B via the first pipe P1 and flows into the spraying part 13 via the second pipe P2. A low-concentration lithium bromide aqueous solution is sprayed from the spraying unit 13.
[0029]
On the other hand, when the operation of the exhaust heat recovery type absorption refrigerator is stopped, the ignition of the burner 9 of the heating unit 8 is stopped and the first refrigerant solution supply path is selected by the supply path switching control unit. Therefore, the first valve V1 is closed and the second valve V2 is opened. Thereby, the low concentration lithium bromide aqueous solution discharged from the absorber 5 flows into the storage part 15 via the first pipe P1. At this time, there is no heat exchange between the exhaust gas and the low concentration lithium bromide aqueous solution because the low concentration lithium bromide aqueous solution is not sprayed from the spraying portion 13. In addition, the heat transfer tube 12 is provided in the vacuum space of the can body 14, and a vacuum space exists between the heat transfer tube 12 and the storage unit 15, so that the exhaust gas in the heat transfer tube Heat hardly transfers to the intermediate concentration lithium bromide aqueous solution stored in the storage unit 15. Even when heat exchange between the exhaust gas in the heat transfer tube 12 and the low-concentration lithium bromide aqueous solution is not performed, the heat transfer tube 12 is not switched, and the heat transfer tube 12 is accompanied by the switching of the tube. Since the damper portion is not provided, high-temperature exhaust gas does not leak from the heat transfer tube 12 to the outside. Here, the vacuum means a reduced pressure state.
[0030]
Even when the operation of the exhaust heat recovery type absorption refrigerator is stopped, it is necessary to operate the solution circulation pump 16 and the refrigerant circulation pump 21 for a certain period of time. That is, when stopping the operation of the exhaust heat recovery type absorption refrigerator, the burner 9 of the high-temperature regenerator 1 is stopped, but the solution circulation pump 16 and the refrigerant circulation pump 21 are continuously operated, and the absorber 5 In this case, water vapor is absorbed by the high concentration lithium bromide aqueous solution. Then, after a predetermined set time has elapsed, the solution circulation pump 16 and the refrigerant circulation pump 21 are stopped. If the state in which the flow of the high concentration lithium bromide aqueous solution in the pipe is stopped is left as it is, the high concentration lithium bromide aqueous solution may solidify in the pipe, and it is necessary to continue the dilution operation for a certain time after the burner 9 stops. Because there is.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a high-efficiency exhaust heat recovery type absorption refrigerator according to the present invention.
FIG. 2 is a diagram for explaining a conventional indirect exhaust heat recovery type absorption refrigerator.
FIG. 3 is a view for explaining a conventional direct exhaust heat recovery type absorption refrigerator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Low temperature regenerator 3 Condenser 4 Evaporator 5 Absorber 6 Low temperature heat exchanger 7 High temperature heat exchanger 8 Heating part 9 Burner 10 Combustion chamber 11 Combustion exhaust gas discharge port 12 Heat exchanger tube 13 Spreading part 14 Can body 15 Reservoir 16 Solution circulation pump 17 Heater 18 First cooling water flow pipe 19 First water sprinkler 20 Second cooling water flow pipe 21 Refrigerant circulation pump 22 Third cooling water flow pipe 23 Shielding case 24 Refrigerant vapor outlet 25 Refrigerant solution Discharge port 26 Heating part exhaust gas pipe 27 Second watering device 28 Exhaust gas heat exchanger 29 Gas-liquid phase separation device (flash tank)
50 exhaust gas pipe 51 first hot water heat exchange part 52 second hot water heat exchange part 53 first hot water pipe 54 second hot water pipe 55 hot water pump 60 exhaust gas heat exchange part 61 first exhaust gas pipe 62 second exhaust gas pipe 63 third exhaust gas pipe B branch part B1 first branch part B2 second branch part D3-5 damper P1 first pipe P2 second pipe V1 first valve V2 second valve

Claims (1)

A high-temperature regeneration that has a storage part for storing the refrigerant solution at the bottom part of the can whose inside is a vacuum space, and separates the refrigerant solution and the refrigerant vapor by heating the refrigerant solution stored in the storage part by the heating part , A low-temperature regenerator that heats the refrigerant solution sent from the high-temperature regenerator with the refrigerant vapor sent from the high-temperature regenerator, and a condensation that cools and condenses the refrigerant vapor that has passed through the low-temperature regenerator And an evaporator for evaporating the refrigerant liquid obtained in the condenser, and an absorber for absorbing the refrigerant vapor generated in the evaporator with the refrigerant solution sent from the low temperature regenerator. Exhaust heat recovery type absorption refrigerator,
In the can of the high-temperature regenerator, there are provided a heat transfer tube through which exhaust gas circulates and a spraying portion for spraying a refrigerant solution to the heat transfer tube, and the refrigerant solution from the absorber flows into the storage portion. One refrigerant solution supply path and a second refrigerant solution supply path through which the refrigerant solution from the absorber flows into the spraying unit are provided. When the refrigerator is operated, the second refrigerant solution supply path is provided in the second refrigerant solution supply path. And the valve provided in the first refrigerant solution supply path is closed, and the refrigerant solution from the absorber is caused to flow into the spraying section via the second refrigerant solution supply path, When stopping the operation, the valve provided in the first refrigerant solution supply path is opened, the valve provided in the second refrigerant solution supply path is closed, and the refrigerant solution from the absorber is supplied to the first refrigerant solution. discharge to flow into the reservoir via the solution supply path Recovery type absorption chiller.

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