JPS6277566A - Double-effect absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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. An outlet pipe 24 of the low temperature regenerator 22 to which the steam pipe 18 is connected is connected to a condenser 26 . Further, the low temperature regenerator 22 and the condenser 26 are connected to the steam pipe 28
communicated by. The condenser 26 communicates via a sparge pipe 30 with an evaporator 34 equipped 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 36. The 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, and the other end of the return pipe 52 is connected to the high temperature regenerator 10 via the circulation pump 54, the low temperature heat exchanger 42, and the high temperature heat exchanger 36. It is connected to.

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, and the refrigerant vapor is passed through the steam pipe 18 to the low temperature regenerator 2.
At the same time, the intermediate concentration solution is sent to the high temperature heat exchanger 36 through the liquid sending pipe 20. 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 enters the low temperature regenerator 22 through the outlet pipe 38.

The refrigerant vapor that entered the low temperature regenerator 22 through the steam pipe 18 is
After heating the intermediate concentration solution from the high temperature heat exchanger 36, it is led to the condenser 26 via 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 is passed through the refrigerant vapor pipe 28 to the condenser 26.
The concentrated solution is introduced into the low temperature heat exchanger 42 via the concentrated solution piping 40.

The refrigerant vapor that has entered the condenser 26 is transferred to the cooling water heat exchanger 50.
After being cooled and turned into a liquid refrigerant, it is sprayed into a low-pressure evaporator 34 via a spray pipe 30. 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 the absorber 44 is transferred to the cooling water heat exchanger 44.
At the same time, it absorbs the refrigerant vapor flowing in from the evaporator 34 and becomes a dilute solution. This dilute solution is absorbed by the circulation pump 54 via the return pipe 52 and sent to the high temperature regenerator 10 again via the low temperature heat exchanger 42 and the high temperature heat exchanger 36.

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

The conventional example shown in FIG. 3 differs from the conventional example described above.
Rather than sending all of the dilute solution from the absorber 44 to the high temperature regenerator 10, the diluted solution is divided between the high temperature heat exchanger 36 and the low temperature heat exchanger 42, and a portion is sent to the high temperature regenerator 10 and a portion is regenerated at a low temperature. The intermediate concentrated solution sent to the reactor 22 and 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, and after passing through the low-temperature heat exchanger 42, flows into the absorber 44. This is how it was done.

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 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, part of the heating amount of the high temperature regenerator 10 is This will be used as sensible heat, resulting in a large amount of heat. On the other hand, in the latter conventional technique, the amount of solution entering the high temperature regenerator 10 is reduced by diversion of the dilute solution, so although the amount of sensible heat in the high temperature regenerator 10 is reduced, the amount of dilute solution entering the low temperature regenerator 22 is reduced. The temperature becomes high due to heat exchange with the concentrated solution, but since it does not rise above the saturation temperature of the low temperature regenerator 22, it is used as sensible heat in the low temperature regenerator 22, 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 problems]

The dual-effect absorption refrigerator of the present invention, which solves the above problems, has the following features:
A high-temperature regenerator equipped with a heating source for heating a dilute solution, a separator for separating the dilute solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentration solution, and an intermediate concentration solution from the separator. a high-temperature heat exchanger that exchanges heat with the dilute solution flowing into the high-temperature regenerator; and a high-temperature heat exchanger that exchanges heat with the dilute solution flowing into the high-temperature regenerator; a low-temperature regenerator that is separated into a low-temperature regenerator, a condenser that condenses refrigerant vapor from the low-temperature regenerator, and a low-pressure evaporator that sprays and evaporates the liquid refrigerant condensed by the condenser to cool cooling water; a low-temperature heat exchanger in which the concentrated solution flowing from the low-temperature regenerator exchanges heat with the dilute solution flowing into the high-temperature heat exchanger and is cooled; and the concentrated solution from the low-temperature heat exchanger is sprayed; A dual-effect absorption refrigerator comprising an absorber that absorbs vapor flowing from the evaporator to form a dilute solution, and a circulation pump that pneumatically conveys 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, and two parts of the solution are led to the low temperature regenerator.

[Effect]

The dilute solution from the absorber is divided at the outlet side of the low-temperature heat exchanger and flows into the high-temperature regenerator and the low-temperature regenerator, and as this dilute solution is diverted, the amount of sensible heat in the high-temperature regenerator is reduced. 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 is reduced.

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, a low temperature heat exchanger 42 and a high temperature heat exchanger 36 are shown.
The dilute solution from the absorber 44 is diverted between the absorber 44 and a part of the dilute solution is guided to the low temperature regenerator 22 via the pipe 50,
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 split between the low temperature heat exchanger 42 and the high temperature heat exchanger 36, with one flowing into the high temperature regenerator 10 and the other flowing into the low temperature regenerator 22. The intermediate concentrated solution that has been 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, and is then sent to the low-temperature regenerator 22 via the branched piping 50. After being mixed with the incoming dilute solution, it is concentrated in the low temperature regenerator 22. 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 .

Since this embodiment operates as described above, the amount of sensible heat is reduced in the high temperature regenerator 10 due to the diversion of the dilute solution from the absorber 44, and the heat of the intermediate concentrated solution higher than the saturation temperature in the low temperature regenerator 22 is reduced. is given to the dilute solution flowing in through the pipe 56, so the amount of sensible heat in the low-temperature regenerator 22 is reduced. Therefore, according to this embodiment, 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 refrigeration efficiency improves.

〔Effect of the invention〕

As described above, the present invention has the effect of increasing the amount of refrigerant generated and improving the refrigeration performance.

[Brief explanation of drawings]

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, 1
6... Separator, 22... Low temperature regenerator,
26... Condenser, 34... Evaporator, 3
6... High temperature heat exchanger, 42... Low temperature heat exchanger,
44...Absorber, 54...Circulation pump.

Claims (1)

[Claims] (1) A high-temperature regenerator equipped with a heating source that heats the dilute solution, a separator that separates the dilute solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentration solution, and an intermediate concentration solution from this separator. a high-temperature heat exchanger in which the solution exchanges heat with the dilute solution flowing into the high-temperature regenerator; and a high-temperature heat exchanger for exchanging heat with the dilute solution flowing into the high-temperature regenerator; A low-temperature regenerator that separates the refrigerant into a concentrated solution, a condenser that condenses the refrigerant vapor from the low-temperature regenerator, and a low-pressure evaporator that sprays and evaporates the liquid refrigerant condensed by the condenser to cool the cooling water. and a low-temperature heat exchanger in which the concentrated solution flowing from the low-temperature regenerator exchanges heat with the dilute solution flowing into the high-temperature heat exchanger and is cooled, and the concentrated solution from the low-temperature heat exchanger is sprayed. an absorber that absorbs the vapor form flowing from the evaporator and becomes 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, the dilute solution from the absorber is separated at the outlet side of the low-temperature heat exchanger; A dual-effect absorption refrigerator characterized in that two parts of the above are led to the low-temperature regenerator.