JPH0429339Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a double-effect absorption refrigerator, and in particular, a double-effect absorption refrigerator equipped with a heat exchanger that recovers waste heat from a heating source for a high-temperature regenerator. Regarding refrigerators.

[Conventional technology]

A conventional dual-effect absorption refrigerator of this type is constructed as shown in FIG. That is, the high temperature regenerator 10 is provided with a heat source 12 and communicates with a separator 16 via piping 14 . The separator 16 is connected to a steam pipe 18 and a liquid feed pipe 20. Low temperature regenerator 22 to which steam pipe 18 is connected
The outlet pipe 24 is connected to a condenser 26 .
Further, the low temperature regenerator 22 and the condenser 26 are communicated through a steam pipe 28. The condenser 26 is connected via a sparge pipe 30 to an evaporator 34 provided with a cold/hot water heat exchanger 32 .

On the other hand, the liquid sending pipe 20 described above is connected to the high temperature heat exchanger 3.
6. An outlet pipe 38 of the high temperature heat exchanger 36 is connected to the low temperature regenerator 22. A concentrated solution pipe 40 provided at the bottom of the low-temperature regenerator 22 is connected to an absorber 44 via a low-temperature heat exchanger 42 . A cooling water heat exchanger 46 is disposed in the absorber 44, and the cooling water heat exchanger 46 is connected to a cooling water heat exchanger 50 disposed in the condenser 26 via a connecting pipe 48. ing.

One end of a return pipe 52 is connected to the lower part of the absorber 44 . A circulation pump 54 is connected to the other end of the return pipe 52, and the discharge side of the pump 54 is connected to the high-temperature regenerator 10 via an outlet pipe 55, a low-temperature heat exchanger 42, and a high-temperature heat exchanger 36. ing. A branch pipe 56 branching off from the outlet pipe 55 of the circulation pump 54 is connected to an exhaust gas heat exchanger 60 provided in the flue 58 of the heat source 12 . This exhaust gas heat exchanger 60 is connected to the absorber 44 via a concentrated solution pipe 62 and to the condenser 26 via a steam pipe 64.

The operation of the dual effect absorption refrigerator constructed as described above is as follows.

The dilute solution in the high temperature regenerator 10 is heated by the heating source 12 and enters the separator 16 at a high temperature. The separator 16 separates the high temperature dilute solution into refrigerant vapor and intermediate concentration solution, sends the refrigerant vapor to the low temperature regenerator 22 through the steam pipe 18, and sends the intermediate concentration solution to the high temperature heat exchanger 36 through the liquid sending pipe 20. send to
The intermediate concentration solution entering the high temperature heat exchanger 36 exchanges heat with the dilute solution sent to the high temperature regenerator 10 to warm the dilute solution, and then is transferred to the low temperature regenerator 2 via the output pipe 38.
Enter 2.

The refrigerant vapor that enters the low temperature regenerator 22 through the steam pipe 18 heats the intermediate concentration solution from the high temperature heat exchanger 36 and is then led to the condenser 26 through the outlet pipe 24. Further, the intermediate concentration solution in the low temperature regenerator 22 is heated to become a concentrated solution and refrigerant vapor, and the refrigerant vapor is led to the condenser 26 via the steam pipe 28.
The concentrated solution is transferred to the low temperature heat exchanger 42 via the concentrated solution piping 40.
guided by.

The refrigerant vapor that has entered the condenser 26 is cooled by the cooling water heat exchanger 50 and becomes a liquid refrigerant.
It is distributed via the distribution pipe 30 to the cold/hot water heat exchanger 32 of the low-pressure evaporator 34 . The liquid refrigerant spread in the evaporator 34 evaporates while cooling the cooling water flowing in the cold/hot water heat exchanger 32 in the evaporator 34 and flows into the absorber 44 . On the other hand, the concentrated solution led from the low-temperature regenerator 22 to the low-temperature heat exchanger 42 is
After being cooled by exchanging heat with the dilute solution pumped to the low-temperature heat exchanger 42 by the circulation pump 54, it is dispersed into the absorber 44. The concentrated solution dispersed in the absorber 44 is cooled by the cooling water heat exchanger 44, absorbs refrigerant vapor flowing from the evaporator 34, and becomes a dilute solution. This dilute solution is sucked by the circulation pump 54 via the return pipe 52, sent to the high temperature regenerator 10 again via the low temperature heat exchanger 42 and the high temperature heat exchanger 36, and is also sent to the high temperature regenerator 10 via the branch pipe 56. Flue 5 led to 60
It is heated by the exhaust gas of the heating source 12 passing through 8 .
The dilute solution is heated in the exhaust gas heat exchanger 60 and separated into a concentrated solution and refrigerant vapor, and the refrigerant vapor is led to the condenser 26 via the steam pipe 64, where it is converted into a liquid refrigerant. Become.

[Problem that the invention attempts to solve]

However, in such a conventional dual-effect absorption refrigerator, heat recovery from the exhaust gas in the exhaust gas heat exchanger 60 was not sufficiently performed.

That is, the steam pipe 64 of the exhaust gas heat exchanger 60 is connected to the condenser 2 in the same way as the outlet pipe 24 of the low-temperature regenerator 22.
6, the solution in the exhaust gas heat exchanger 60 is heated to 90°C like the solution in the low temperature regenerator 22.
There was a problem in that refrigerant vapor would not be generated unless it was heated to a higher level.

Therefore, even if the area of the exhaust gas heat exchanger 60 is increased, the maximum amount of heat that can be recovered is limited to about 5% in terms of heat input ratio, which is disadvantageous in that the amount of heat contained in the exhaust gas cannot be sufficiently recovered.

The purpose of this invention is to provide a dual-effect absorption refrigerator that can efficiently recover the amount of heat in exhaust gas using an exhaust gas heat exchanger.

[Means for solving problems]

This invention, which solved the above problems, consists of a high-temperature regenerator equipped with a heating source for heating the dilute solution, and a separator that separates the dilute solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentration solution. , a high temperature heat exchanger in which an intermediate concentration solution from the separator exchanges heat with a dilute solution flowing into the high temperature regenerator; and an intermediate concentration solution flowing from the high temperature heat exchanger with refrigerant vapor led from the separator. A low-temperature regenerator that heats a solution and separates it into refrigerant vapor and a concentrated solution, a condenser that condenses the refrigerant vapor from the low-temperature regenerator, and a liquid refrigerant condensed by the condenser that is sprayed and evaporated to cool it. a low-pressure evaporator that cools utility water; a low-temperature heat exchanger in which the concentrated solution flowing from the low-temperature regenerator is cooled by exchanging heat with the dilute solution flowing into the high-temperature heat exchanger; and the low-temperature heat exchanger. The concentrated solution from the evaporator is dispersed, and the absorber absorbs the vapor flowing in from the evaporator to become a dilute solution, and the dilute solution generated in this absorber is passed through the low temperature heat exchanger and the high temperature heat exchanger. and an exhaust gas heat exchanger installed in the flue of the heating source that heats a portion of the dilute solution flowing into the low temperature heat exchanger to generate refrigerant vapor. In the dual-effect absorption refrigerator, a suction device for sucking the refrigerant vapor generated by the exhaust gas heat exchanger is provided in the piping that leads the intermediate concentration solution heat-exchanged in the high-temperature heat exchanger to the low-temperature regenerator. It is characterized by:

[Effect]

The refrigerant vapor generated in the exhaust gas heat exchanger is sucked into the intermediate concentration solution by a suction device connected to a pipe that leads the intermediate concentration solution heat exchanged in the high temperature heat exchanger to the low temperature regenerator. This lowers the pressure inside the exhaust gas heat exchanger, lowers the boiling point of the dilute solution, and activates the generation of refrigerant vapor, making it possible to efficiently recover the amount of heat contained in the exhaust gas.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the drawings. Note that the same reference numerals are given to the parts corresponding to the parts explained in the prior art, and the explanation thereof will be omitted.

FIG. 1 is a schematic diagram showing an embodiment of the dual-effect suction refrigerator according to this invention.

In FIG. 1, this embodiment differs from the configuration in FIG.
A bench lily 66 is provided as a suction device, and an exhaust gas heat exchanger 60 is installed in the throat of this bench lily 66.
The other point is that a steam pipe 64 for guiding the refrigerant vapor generated in the above is connected, and the other structure is the same as that of the prior art.

The operation of the embodiment configured in this way will be explained.

As the intermediate concentration solution flows through the pipe 38, it passes through the throat of the bench lily 66 at high speed. This reduces the pressure at the throat of the bench lily 66, and the refrigerant vapor generated in the exhaust gas heat exchanger 60 is sucked through the steam pipe 64 and guided to the low temperature regenerator 22 together with the intermediate concentration solution. The exhaust gas heat exchanger 60 becomes low pressure (negative pressure) due to the pressure drop at the throat of the bench lily 66, and the exhaust gas heat exchanger 60
lowers the boiling point of the dilute solution flowing into the As the boiling point is lowered in this way, the generation of refrigerant vapor becomes more active, and the amount of heat contained in the exhaust gas can be efficiently taken into the dilute solution in the exhaust gas heat exchanger. The absorbed heat can be given to the Therefore, the heat given to the intermediate concentration solution can be used to generate refrigerant vapor again in the low-temperature regenerator 22, resulting in a significant increase in the coefficient of performance during cooling.

In addition, in the above embodiment, the intermediate concentration solution piping 38
Although a case has been described in which a bench lily 66 is provided as a suction device, an ejector or the like may of course be used as an absorption device instead of the bench lily 66.

[Effect of idea]

As explained above, this invention has the effect that the amount of heat contained in the exhaust gas can be efficiently recovered.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a direct-fired dual-effect absorption refrigerator according to the present invention, and FIG. 2 is a schematic diagram of a conventional direct-fired dual-effect absorption refrigerator. 10... High temperature regenerator, 12... Heat source, 16...
... Separator, 22 ... Low temperature regenerator, 26 ... Condenser, 34 ... Evaporator, 36 ... High temperature heat exchanger, 4
2... Low temperature heat exchanger, 44... Absorber, 54...
Circulation pump, 60...Exhaust gas heat exchanger, 66...
Bench lily.

Claims (1)

[Claims for Utility Model Registration] (1) A high-temperature regenerator equipped with a heating source for heating a dilute solution, and a separator that separates the dilute solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentration solution. , a high temperature heat exchanger in which an intermediate concentration solution from the separator exchanges heat with a dilute solution flowing into the high temperature regenerator; and an intermediate concentration solution flowing from the high temperature heat exchanger with refrigerant vapor led from the separator. A low-temperature regenerator that heats the refrigerant and separates it into refrigerant vapor and a concentrated solution, a condenser that condenses the refrigerant vapor from the low-temperature regenerator, and the condensed liquid refrigerant that is sprayed and evaporated by the condenser to produce cooling water. a low-pressure heat exchanger in which the concentrated solution flowing from the low-temperature regenerator is cooled by exchanging heat with the dilute solution flowing into the high-temperature heat exchanger; and this low-temperature heat exchanger The concentrated solution is sprayed from the evaporator, and the absorber absorbs the vapor flowing in from the evaporator to become a dilute solution. The dilute solution generated in this absorber is passed through the low temperature heat exchanger and the high temperature heat exchanger. and an exhaust gas heat exchanger installed in the flue of the heating source that heats a part of the dilute solution flowing into the low temperature heat exchanger to generate refrigerant vapor. In the heavy-effect absorption refrigerator, a suction device for sucking refrigerant vapor generated in the exhaust gas heat exchanger is provided in the piping leading the intermediate concentration solution heat-exchanged in the high-temperature heat exchanger to the low-temperature regenerator. Features a dual-effect absorption refrigerator. (2) The dual-effect absorption refrigerator according to claim 1, wherein the suction device is a bench lily. (3) The dual-effect absorption refrigerator according to claim 1, wherein the suction device is an ejector.