JPH0473060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a double-effect absorption refrigerator, and more particularly to a double-effect absorption refrigerator in which the amount of refrigerant generated is increased.

[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 provided with 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 . Furthermore, the low temperature regenerator 22 and the condenser 26 are connected to the steam pipe 2
8. The condenser 26 communicates via a sparge pipe 30 with an evaporator 34 in which a cold/hot water heat exchanger 32 is provided.

On the other hand, the liquid sending pipe 20 described above is connected to the high temperature heat exchanger 3.
It is connected to 6. An outlet pipe 38 of the high temperature heat exchanger 36 is connected to the low temperature regenerator 22. and,
Concentrated solution piping 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, and the other end of this return pipe 52 is connected to the circulation pump 54, the low temperature heat exchanger 42, and the high temperature heat exchanger 3.
6 to a high temperature regenerator 10.

The operation of the above-mentioned direct-fired dual-effect absorption refrigerator 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 22 via the output pipe 38.
Go inside.

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, which are led to the condenser 26 via the refrigerant vapor steam pipe 28, and the concentrated solution is heated to low temperature heat by the concentrated solution pipe 40. It is led to an exchanger 42.

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 a distribution pipe 30 into a 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 cooled by exchanging heat with the dilute solution pumped to the low-temperature heat exchanger 42 by the circulation pump 54, and then transferred to the absorber 44. distributed within. The concentrated solution sprayed into this absorber 44 is
It is cooled by the cooling water heat exchanger 46 and absorbs the refrigerant vapor flowing in from the evaporator 34 to become a dilute solution. This diluted solution is sucked by the circulation pump 54 via the return pipe 52 and is transferred to the low temperature heat exchanger 4.
2. High temperature regenerator 1 again via high temperature heat exchanger 36
Sent to 0.

FIG. 3 is a system diagram showing another conventional example.

The difference between the conventional example shown in FIG. A portion is sent to the high temperature regenerator 10 and a portion is sent to the low temperature regenerator 22, and the intermediate concentrated solution concentrated in the high temperature regenerator 10 and the low temperature regenerator 22 is combined at the inlet of the low temperature heat exchanger 42. , after passing through a low-temperature heat exchanger 42, it flows into an absorber 44.

Such a conventional example also has almost the same effect as the above-mentioned conventional example.

[Problem that the invention seeks to solve]

However, in the case of the former conventional technology,
Since the temperature of the dilute solution entering the high-temperature regenerator 10 has not reached the saturation temperature at the pressure of the high-temperature regenerator 10, a part of the heating amount of the high-temperature regenerator 10 is used as sensible heat, resulting in a decrease in the amount of heat. becomes larger. On the other hand, regarding the latter conventional technology,
Due to the diversion of the dilute solution, the amount of solution entering the high-temperature regenerator 10 is reduced, so the amount of sensible heat in the high-temperature regenerator 10 is reduced, but the temperature of the dilute solution entering the low-temperature regenerator 22 is
Although the temperature becomes high due to heat exchange with the concentrated solution, the temperature does not rise above the saturation temperature of the low-temperature regenerator 22, so the low-temperature regenerator 22 ends up using it as sensible heat, resulting in a large amount of heat.

Therefore, all of the above conventional techniques have the problem that the amount of heat used as latent heat necessary for generating refrigerant decreases, resulting in a decrease in the refrigeration coefficient of performance.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a dual-effect absorption refrigerating machine that can effectively utilize input heat, increase the amount of refrigerant generated, and improve the refrigeration coefficient of performance. It's about doing.

[Means for Solving the Problems] The dual-effect absorption refrigerator of the present invention that solves the above problems includes a high-temperature regenerator provided with a heating source for heating a dilute solution, and a high-temperature regenerator that is heated by the high-temperature regenerator. a separator for separating a dilute solution into a refrigerant vapor and an intermediate concentration solution stream; a high temperature heat exchanger for exchanging heat between the intermediate concentration solution from the separator and the dilute solution flowing into the high temperature regenerator; and the separator. a low-temperature regenerator that heats the intermediate concentration solution flowing in from the high-temperature heat exchanger with refrigerant vapor led from the high-temperature heat exchanger and separates it into refrigerant vapor and a concentrated solution; and a condenser that condenses the refrigerant vapor from the low-temperature regenerator. The liquid refrigerant condensed by the condenser is sprayed and evaporated, and the low-pressure evaporator cools the cooling water, and the concentrated solution flowing from the low-temperature regenerator flows into the high-temperature heat exchanger. a low-temperature heat exchanger that is cooled by exchange, and an absorber in which the concentrated solution from the low-temperature heat exchanger is sprayed and absorbs vapor flowing from the evaporator to become a dilute solution;
In a dual-effect absorption refrigerator having a circulation pump that pumps the dilute solution generated in the absorber to the low-temperature heat exchanger, the dilute solution from the absorber is divided at the outlet side of the low-temperature heat exchanger, The intermediate concentrated solution whose temperature has been lowered in the high temperature heat exchanger and the branched dilute solution are mixed and are provided with piping that leads to the low temperature regenerator.

[Effect]

Dividing the dilute solution from the absorber at the outlet side of the low-temperature heat exchanger to flow into the high-temperature regenerator and the low-temperature regenerator,
By diverting this dilute solution, the amount of sensible heat in the high-temperature regenerator decreases, and since the heat of the intermediate concentrated solution, which is higher than the saturation temperature in the low-temperature regenerator, is given to the dilute solution, the amount of sensible heat in the low-temperature regenerator decreases. will decrease.

According to the present invention, since the ratio of the amount of latent heat to the amount of heating increases compared to the conventional technology, the amount of refrigerant generated increases and the refrigeration efficiency improves.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a dual-effect absorption refrigerator according to the present invention.

In FIG. 1, the dilute solution from the absorber 44 is divided between the low-temperature heat exchanger 42 and the high-temperature heat exchanger 36, and a portion of the dilute solution is guided to the low-temperature regenerator 22 via piping 56. The remainder of the dilute solution is made to flow into the high temperature regenerator 10, and the other configurations are the same as the prior art shown in FIG.

The operation of the embodiment having such a configuration will be explained. The dilute solution leaving the absorber 44 is transferred to the low temperature heat exchanger 4
2 and the high-temperature heat exchanger 36 , one side flows into the high-temperature regenerator 10 and the other side flows into the low-temperature regenerator 22 . The intermediate concentrated solution concentrated in the high-temperature regenerator 10 and separated into steam and water in the separator 16 is sent to the low-temperature regenerator 22 through the high-temperature heat exchanger 36.
After being mixed with the dilute solution that has flowed into the low-temperature regenerator 22 via the branched pipe 56, the low-temperature regenerator 2
It is concentrated in 2. The concentrated solution concentrated in the low-temperature regenerator 22 is sent to the absorber 44 through a pipe 40 and a low-temperature heat exchanger 42 .

This embodiment works as described above, so that the high temperature regenerator 10 by diversion of dilute solution from the absorber 44
The amount of sensible heat is reduced in
The amount of sensible heat in the low temperature regenerator 22 is reduced because it is given to the dilute solution flowing in through the low temperature regenerator 22. Therefore, according to this embodiment, the proportion of latent heat in the amount of heating increases compared to the conventional technology, so
The amount of refrigerant generated increases and refrigeration efficiency improves.

〔Effect of the invention〕

As described above, according to the present invention, the dilute solution is divided at the outlet of the low-temperature heat exchanger, so of the heat input to the high-temperature regenerator, the amount of heat consumed for increasing sensible heat is reduced, and the amount of heat used for generating refrigerant is reduced. The heat of the intermediate concentrated solution, which is higher than the saturation temperature in the low-temperature regenerator, is given to the dilute solution flowing into the low-temperature regenerator, and is used to raise the sensible heat of the dilute solution in the low-temperature regenerator. As the heat value of refrigerant vapor decreases, the proportion of heat used for refrigerant generation increases, and overall, of the heat added by the high-temperature regenerator, the proportion used for latent heat of vaporization of refrigerant vapor increases, resulting in increased refrigerant generation. This has the effect of increasing the amount and improving the freezing performance.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of a dual-effect absorption refrigerator according to the present invention, and FIGS. 2 and 3 are schematic diagrams of a conventional dual-effect absorption refrigerator. 10...High temperature regenerator, 12...Heating 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.

Claims (1)

[Scope of Claims] 1. A high-temperature regenerator provided with a heating source for heating a dilute solution; 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 the intermediate concentration solution from the separator exchanges heat with the dilute solution flowing into the high temperature regenerator;
a low-temperature regenerator that heats the intermediate concentration solution flowing from the high-temperature heat exchanger with the refrigerant vapor led from the separator and separates it into refrigerant vapor and a concentrated solution; and a low-temperature regenerator that condenses the refrigerant vapor from the low-temperature regenerator. a condenser, a low-pressure evaporator in which liquid refrigerant condensed by the condenser is sprayed and evaporated to cool cooling water; and a diluted liquid refrigerant in which the concentrated solution flowing from the low-temperature regenerator flows into the high-temperature heat exchanger. a low-temperature heat exchanger that cools by exchanging heat with a solution; an absorber into which the concentrated solution from the low-temperature heat exchanger is sprayed and which absorbs refrigerant vapor flowing from the evaporator to become a dilute solution;
In a dual-effect absorption refrigerator having a circulation pump that pumps a dilute solution generated in the absorber to the low-temperature heat exchanger, branching the dilute solution from the absorber at the outlet side of the low-temperature heat exchanger; A dual-effect absorption refrigerating machine characterized by comprising a pipe for mixing the intermediate concentrated solution whose temperature has been lowered in the high-temperature heat exchanger and the branched dilute solution and guiding the mixture to the low-temperature regenerator.