JP2696581B2 - Absorption refrigeration equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an absorption refrigeration apparatus, and more particularly to heat recovery in a double-effect absorption refrigeration apparatus constituted by two single-effect absorption chillers. .

[Conventional technology]

Conventionally, in a double effect absorption refrigerator, techniques such as a method of branching a dilute solution from an absorber and introducing a part of the diluted solution to a low temperature generator or effectively recovering waste heat have been developed. ,
There was still a problem with the effective use of heat.

In the double-effect absorption refrigeration system, the high-pressure stage refrigerator uses a normal single-effect absorption refrigerator, a condenser is provided outside, and a low-pressure stage solution is used as a cooling medium. The low-pressure stage refrigerator also uses a normal single-effect absorption refrigerator and uses a refrigerant vapor from a high-pressure stage as a heat source, which is known from Japanese Patent Publication No. 52-6896, but heat recovery is considered. I didn't.

[Problems to be solved by the invention]

Therefore, the present invention solves the above-described problems, and aims at effective use of energy that can sufficiently perform heat recovery in a double-effect absorption refrigeration system including a high-pressure stage refrigerator and a low-pressure stage refrigerator. It is an object of the present invention to provide an absorption refrigeration apparatus.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a high temperature generator, an absorber, an evaporator, a solution heat exchanger, and an external condenser are used as main components, and a cycle is configured by connecting these with a solution pipe and a refrigerant pipe. High-pressure refrigerator and low-temperature generator,
Condenser, absorber, evaporator, and low-temperature solution heat exchanger are the main components.They consist of a low-pressure stage refrigerator that connects these with solution piping and refrigerant piping to form a cycle. In the absorption refrigeration system that is on the heating side of the low-temperature generator of the stage and performs a double-effect cycle as a whole, a high-temperature heat recovery device is connected to the dilute solution line between the high-temperature generator and the solution heat exchanger, A low-temperature heat recovery device is provided in the dilute solution line between the generator and the low-temperature solution heat exchanger, and the heat source medium after passing through the high-temperature generator is guided to the high-temperature heat recovery device, and then to the low-temperature heat recovery device. And an absorption refrigerating apparatus characterized by being connected to the apparatus.

In addition, in order to achieve the above object, in the present invention, a high-temperature generator, an absorber, an evaporator, a solution heat exchanger, and an external condenser are used as main components, and these are connected by a solution pipe and a refrigerant pipe to form a cycle. The main components are a high-pressure stage refrigerator, a low-temperature generator, a condenser, an absorber, an evaporator, and a low-temperature solution heat exchanger, and these are connected by solution piping and refrigerant piping to form a low-pressure stage refrigeration. The high-pressure stage external condenser becomes the heating side of the low-pressure stage low-temperature generator,
In an absorption refrigeration system that has a double effect cycle as a whole, a refrigerant drain heat exchanger is provided in the dilute solution line between the low temperature generator and the low temperature solution heat exchanger, and the refrigerant is generated in the high temperature generator,
The refrigerant drain condensed by the low-temperature generator is guided to the refrigerant drain heat exchanger, and then to a refrigerant drain line connected to an evaporator of a high-pressure refrigerator or a pipe connected to the evaporator,
A refrigerant drain cooler cooled by cooling water is provided in a refrigerant drain line between the refrigerant drain heat exchanger and the evaporator of the high-pressure stage refrigerator, or a rare water between the high-temperature generator and the solution heat exchanger. A high-temperature heat recovery unit is installed in the solution line, and a low-temperature heat recovery unit is installed in the dilute solution line between the low-temperature generator and the refrigerant drain heat exchanger. And then connected to a low-temperature heat recovery unit so as to lead to a low-temperature heat recovery unit.

When steam is used as the heat source medium of the high-temperature generator in these absorption refrigeration systems, a high-temperature drain heat exchanger is used as the high-temperature heat recovery unit, and a low-temperature drain heat exchanger is used as the low-temperature heat recovery unit. The water (drain) can be connected such that it is first directed to the heated side of the hot drain heat exchanger and then to the heated side of the cold drain heat exchanger.

[Action]

Heat recovery includes recovery of residual heat from the heat source used in the high-temperature generator (recovery of drain heat when the heat source is steam), and
There are two types of heat recovery (refrigerant drain heat recovery) of the refrigerant vapor from the high pressure stage heating the low pressure stage and forming a drain.

The heat applied to the high temperature generator then serves as a type of double effect cycle, and the heat applied to the low temperature generator serves as a heat source for the single effect cycle. It is desirable to recover in a solution related to the high-temperature generator, which is effective and has no effect in the case of heat recovery. Since the heat source used in the high temperature generator is still at a high temperature level, it can provide heat to the dilute solution leaving the solution heat exchanger of the high pressure refrigerator. Then, the heat is recovered in the high-pressure stage, and after the temperature is lowered, the solution temperature is low, and the heat can be recovered to the solution related to the low-temperature generator that has a single-effect function, thereby increasing the overall efficiency. be able to.

Therefore, the heat source medium that has passed through the high-temperature generator is first guided to the high-temperature heat recovery device, and then to the low-temperature heat recovery device, which is effective in increasing the efficiency.

On the other hand, the refrigerant drain generated by the high-temperature generator and condensed by the low-temperature generator is returned to the high-pressure stage evaporator, and the refrigeration effect (the difference between the enthalpy of the evaporated refrigerant and the enthalpy of the refrigerant liquid to the evaporator) is obtained. Less is. Since the solution related to the low-pressure stage side low-temperature generator has a low temperature and can lower the refrigerant liquid temperature, the provision of the refrigerant drain heat exchanger here can reduce the above-mentioned refrigerant liquid enthalpy, and furthermore, the solution It also provides heat recovery for the cycle. Therefore, the heat of the refrigerant drain heat is recovered in the solution related to the low-temperature generator having the single-effect function.

The temperature of the refrigerant liquid can be further reduced by cooling water, and the refrigeration effect can be improved. Alternatively, the refrigerant liquid can be further cooled by a solution or the like that has exited the absorber to enhance the refrigeration effect. The heat of recovery in the dilute solution in this case is almost independent of the increase in cycle efficiency.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 and FIG. 2 are schematic process diagrams showing an example of the absorption refrigeration apparatus of the present invention.

As shown in FIGS. 1 and 2, the absorption refrigeration system of the present invention comprises a low-pressure stage refrigerator having a low-temperature generator and a high-pressure stage refrigerator having a high-temperature generator.

First, in the high-pressure stage refrigerator, the dilute solution from the absorber A1 is passed by the solution pump 16 through the heated side of the solution heat exchanger H1,
Guided to the high temperature generator G1. In the high-temperature generator G1, an external heat source
The solution is concentrated by being heated by 25, and the refrigerant vapor generated at this time flows from the pipe 21 to the low-temperature generator G2 of the low-pressure stage refrigerator.
Through the heating side 7 and then into the evaporator E1 via the tube 22. On the other hand, the solution concentrated in the high-temperature generator G1 passes through the pipe 18 through the heating side of the solution heat exchanger H1, and enters the absorber A1.

In the evaporator E1, cold water 11 is introduced, heat is taken from the cold water, and the refrigerant liquid evaporates to exhibit a refrigeration effect. The evaporated refrigerant vapor is absorbed by the solution in the absorber A1, and the refrigerant that does not evaporate is circulated to the evaporator E1 through the pipe 12 by the refrigerant pump 13.

Next, in the low-pressure stage refrigerator, the dilute solution from the absorber A2 is heat-exchanged by the solution pump 6 through the heated side of the low-temperature solution heat exchanger H2 to increase the temperature, and is introduced into the low-temperature generator G2. Is done. In the low-temperature generator G2, the solution is concentrated by being heated by the refrigerant vapor generated from the high-temperature generator G1 of the high-pressure stage refrigerator, and the refrigerant vapor generated at this time is guided to the condenser C2 and supplied to the cooling water 9. Thus, it is cooled and condensed, and is led from the pipe 10 to the evaporator E2. In the evaporator E2, the refrigerant liquid removes heat from the cold water 1 and exhibits a refrigeration effect to evaporate. The evaporated refrigerant vapor is absorbed by the absorber
The refrigerant that is absorbed by the solution in A2 and does not evaporate is the refrigerant pump 3
Circulates through the pipe 2 to the evaporator E2.

In such an apparatus, in FIG. 1, a high-temperature heat recovery unit F1 is provided in a dilute solution line 15 between a high-temperature stage high-temperature generator G1 and a solution heat exchanger H1, and a low-pressure stage low-temperature A low-temperature heat recovery unit F2 is provided in the dilute solution line 5 between the generator G2 and the low-temperature solution heat exchanger H2, and the heat source medium 25 passing through the high-temperature generator G1 is first passed through a pipe 17 to a high-temperature heat recovery unit. The heat is led to F1 and then to the low-temperature heat recovery unit F2 to effectively recover the heat of the heat source medium.

In FIG. 2, a refrigerant drain heat exchanger R1 is provided in the dilute solution line 5 between the low-temperature stage low-temperature generator G2 and the low-temperature solution heat exchanger G2. And the refrigerant drain condensed on the heating side 7 of the low-temperature generator G2,
After leading to the refrigerant drain heat exchanger R1, the refrigerant drain heat exchanger R2 is provided from the pipe 26 to the evaporator E1 of the high-pressure stage refrigerator, or further, to the dilute solution line coming out of the low-pressure stage absorber. Then, the refrigerant drain passed through R1 is passed through R2, and a refrigerant drain cooler R3 is provided in the refrigerant drain line 26, and the refrigerant drain exiting R1 and R2 is further cooled with cooling water to evaporate the high-pressure stage refrigerator. It can be introduced into the vessel E1, and the refrigerant drain heat can be used effectively.

Further, the apparatus shown in FIG. 2 provided with such a refrigerant drain heat exchanger can be combined with the heat recovery system of the heat source medium shown in FIG. In this case, the low-temperature heat recovery unit F2 is preferably provided in a dilute solution line between the low-temperature generator G2 and the refrigerant drain heat exchanger R1.

〔The invention's effect〕

According to the present invention, in a double-effect absorption refrigerating apparatus configured by connecting two single-effect absorption refrigerating machines, the heat of the heat source medium used in the high-temperature generator can be sufficiently used for heating the dilute solution, The refrigerant vapor generated by the high-temperature generator can be sufficiently recovered from the heat, and the refrigerant liquid can be returned to the evaporator at a low temperature, so that the energy can be effectively used.

[Brief description of the drawings]

FIG. 1 and FIG. 2 are schematic process diagrams showing an example of the absorption refrigeration apparatus of the present invention. A1, A2: Absorber, E1, E2: Evaporator, G1: High-temperature generator, G2: Low-temperature generator, C2: Condenser, H1: Solution heat exchanger, H2: Low-temperature solution heat Exchanger, F1: High-temperature heat recovery unit, F2: Low-temperature heat recovery unit, R1, R2: Refrigerant drain heat exchanger, R3: Refrigerant drain cooler, 1,11 ... Cold water, 3,13 ... Refrigerant pump, 4,9,14,27 …… Cooling water, 6,16 …… Solution pump, 25 …… Heat source,

Claims (4)

(57) [Claims] A high-pressure stage refrigerator having a high-temperature generator, an absorber, an evaporator, a solution heat exchanger, and an external condenser as main components, and connecting these with a solution pipe and a refrigerant pipe to form a cycle; It consists of a low-pressure generator, a condenser, an absorber, an evaporator, and a low-temperature solution heat exchanger, and consists of a low-pressure stage refrigerator that connects these with solution piping and refrigerant piping to form a cycle. The external condenser is on the heating side of the low-pressure stage low-temperature generator, and as a whole, in the absorption refrigeration system that performs a double-effect cycle, the high-temperature heat is recovered in the dilute solution line between the high-temperature generator and the solution heat exchanger. A low-temperature heat recovery device is provided in the dilute solution line between the low-temperature generator and the low-temperature solution heat exchanger, and the heat source medium after passing through the high-temperature generator is led to the high-temperature heat recovery device, and then the low-temperature heat recovery is performed. It is characterized in that it is connected so as to lead to the collection device Osamu refrigeration equipment. 2. The method according to claim 1, wherein steam is used as a heat source medium of the high-temperature generator, a high-temperature drain heat exchanger is used as a high-temperature heat recovery unit, and a low-temperature drain heat recovery unit is used as a low-temperature heat recovery unit. An absorption refrigerating apparatus characterized in that condensed water (drain) is first connected to a heating side of a high-temperature drain heat exchanger, and then connected to a heating side of a low-temperature drain heat exchanger. 3. A high-pressure refrigerating machine comprising a high-temperature generator, an absorber, an evaporator, a solution heat exchanger, and an external condenser as main components, and connecting these with a solution pipe and a refrigerant pipe to form a cycle; It consists of a low-temperature generator, condenser, absorber, evaporator, and low-temperature solution heat exchanger as main components, and a low-pressure stage refrigerator that connects these with solution piping and refrigerant piping to form a cycle. The condenser becomes the heating side of the low-pressure stage low-temperature generator, and as a whole, the refrigerant drain heat exchange with the dilute solution line between the low-temperature generator and the low-temperature solution heat exchanger in the absorption refrigeration system A refrigerant drain generated by the high-temperature generator and condensed by the low-temperature generator is guided to the refrigerant drain heat exchanger, and then connected to an evaporator of the high-pressure stage refrigerator or a pipe connected to the evaporator. Lead to the line and said The refrigerant drain line between the medium drain heat exchanger and the high pressure stage refrigerator evaporator, absorption refrigerating apparatus, characterized in that a coolant drain cooler which is cooled by cooling water. 4. A high-pressure refrigerating machine comprising a high-temperature generator, an absorber, an evaporator, a solution heat exchanger, and an external condenser as main components, and connecting these with a solution pipe and a refrigerant pipe to form a cycle; The main components are a low-temperature generator, condenser, absorber, evaporator, and low-temperature solution heat exchanger.These components are composed of a low-pressure stage refrigerator that connects these with solution piping and refrigerant piping to form a cycle. In the absorption refrigeration system, in which the condenser is on the heating side of the low-pressure stage low-temperature generator and performs a double-effect cycle as a whole, the refrigerant drain heat exchanges with the dilute solution line between the low-temperature generator and the low-temperature solution heat exchanger. A refrigerant drain generated by the high-temperature generator and condensed by the low-temperature generator,
After leading to the refrigerant drain heat exchanger, the refrigerant drain line connected to the evaporator of the high-pressure stage refrigerator or a pipe connected to the evaporator, and to the dilute solution line between the high temperature generator and the solution heat exchanger. Provide a high-temperature heat recovery unit, a low-temperature heat recovery unit in the dilute solution line between the low-temperature generator and the refrigerant drain heat exchanger, guide the heat source medium after passing through the high-temperature generator to the high-temperature heat recovery unit, An absorption refrigeration unit, which is connected to a low-temperature heat recovery unit.