CN210089182U

CN210089182U - Absorption type supercooling refrigerating system

Info

Publication number: CN210089182U
Application number: CN201920405541.0U
Authority: CN
Inventors: 杨永安; 李瑞申; 谷沅橙
Original assignee: Tianjin University of Commerce
Current assignee: Tianjin University of Commerce
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-02-18
Anticipated expiration: 2029-03-26

Abstract

The utility model discloses an absorption type supercooling refrigerating system, which aims to provide a refrigerating system which can realize large supercooling degree and has low operation cost. The refrigeration system comprises a main refrigeration cycle and an absorption type supercooling refrigeration cycle, wherein the absorption type supercooling cycle is driven by refrigerant cooling heat at an exhaust port of a compressor in the main refrigeration cycle. The main refrigeration cycle is a refrigeration cycle which is formed by sequentially connecting a compressor, a refrigerant side channel of a generator, a main condenser, a supercooling side channel of a subcooler, a first throttling device, an evaporator and a refrigerant side channel of an absorber and then returning to the compressor; the absorption type supercooling cycle comprises a branch condenser, a solution heat exchanger, a solution pump, a second throttling device, a third throttling device, a generator, a subcooler and an absorber. The utility model discloses a system utilizes the solution that is rich in the refrigerant in compressor gas vent high-temperature gas's the cooling heat heating generator, and absorption formula subcooling circulation effectively utilizes the waste heat, does not have other energy input, and the running cost is low.

Description

Absorption type supercooling refrigerating system

Technical Field

The utility model relates to a refrigeration technology field, more specifically say so, relate to a take compression gas vent refrigerant cooling heat drive absorption type subcooling circulation to carry out liquid subcooling's refrigerating system.

Background

In the practical application of the single-stage compression vapor refrigeration cycle, the thermodynamic integrity of the cycle can be improved by measures such as liquid subcooling, vapor superheating and the generated regenerative cycle. The traditional liquid supercooling process can be realized by increasing the area of the condenser, and because the heat exchange medium of the mode is not changed, the heat exchange area of the condenser is greatly increased to reduce the heat exchange temperature difference, so that the lower liquid temperature of the outlet of the condenser can be realized, the supercooling degree obtained by realizing supercooling only by the condenser has a certain limit, the heat exchange area of the condenser is increased, the initial investment cost is increased, and the method is not suitable for a large-scale refrigeration system. Another way to achieve the liquid subcooling process is to add a subcooler after the condenser to increase the degree of subcooling, which often requires a lower temperature fluid to exchange heat with the refrigerant to achieve the refrigerant liquid subcooling, however, a lower temperature fluid is often not available. A heat regenerator is added for a small refrigeration system, so that heat exchange between a liquid refrigerant at an outlet of a condenser and a refrigerant at an outlet of an evaporator is realized, the heat regenerator realizes liquid supercooling, meanwhile, the work consumption of a compressor is increased, and whether the refrigeration coefficient of a heat regeneration cycle is improved depends on the physical properties of the refrigerants. For a large-scale refrigerating system, a supercooling refrigerating device is added, namely a set of small refrigerating system is added to ensure that the evaporator and the outlet liquid of the condenser of the large-scale refrigerating system exchange heat to realize larger supercooling degree, and the investment cost and the operation cost are increased due to the addition of a set of small refrigerating device.

The compressor in the refrigeration cycle discharges high-temperature gas in the operation process, the high-temperature gas enters the condenser and transfers heat to a condensing medium to become high-pressure liquid through the cooling process and the condensing process, wherein a refrigerant in the cooling process is high-temperature gas all the time, occupies a large amount of space of the condenser, and whether the cooling process is carried out fully or directly influences the discharge temperature of the compressor. Therefore, how to effectively reduce the exhaust temperature of the compressor, reasonably utilize the cooling heat of the refrigerant at the exhaust port of the compressor, prolong the service life of the refrigeration compressor and reasonably use the energy is an effective way for improving the performance of the refrigeration system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical defect who exists among the prior art, and provide one kind and can realize great super-cooled degree, absorption formula super-cooled refrigerating system that running cost is low.

For realizing the utility model discloses a technical scheme that the purpose adopted is:

an absorption supercooling refrigeration system comprises a main refrigeration cycle and an absorption supercooling refrigeration cycle, wherein the absorption supercooling cycle is driven by cooling heat of a refrigerant at a compressor exhaust port in the main refrigeration cycle.

The main refrigeration cycle is a refrigeration cycle which is formed by sequentially connecting the compressor, a refrigerant side channel of the generator, the main condenser, a supercooling side channel of the subcooler, the first throttling device, the evaporator and a refrigerant side channel of the absorber and then returning to the compressor; the absorption type supercooling cycle comprises a branch condenser, a solution heat exchanger, a solution pump, a second throttling device, a third throttling device, the generator, the subcooler and the absorber, wherein a cold side outlet of the solution heat exchanger is connected with a solution inlet of the generator, a hot side inlet of the solution heat exchanger is connected with a solution outlet of the generator, a hot side outlet of the solution heat exchanger is connected with a solution inlet of the absorber through the third throttling device, and a solution outlet of the absorber is connected with a cold side inlet of the solution heat exchanger through the solution pump; and a gas outlet of the generator is connected with an evaporation side inlet of the subcooler through the branch condenser and the second throttling device, and an evaporation side outlet of the subcooler is connected with the gas inlet of the absorber.

The branch condenser and the main condenser are air-cooled condensers, water-cooled condensers or evaporative condensers.

The evaporator is air-cooled or solution-cooled.

The superheater, the subcooler and the generator are plate heat exchangers, double-pipe heat exchangers or shell-and-tube heat exchangers.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses the solution that is rich in the refrigerant in the cooling heat heating generator that absorption formula subcooling refrigerating system utilized compressor gas vent high-temperature gas, and absorption formula subcooling circulation effectively utilizes the waste heat, does not have other energy input, and the running cost is low. The cooling process of the high-temperature gas at the exhaust port of the compressor is realized in the generator, and the main condenser only realizes the condensation process of the refrigerant, so that the heat exchange area of the main condenser is reduced, and the investment cost is reduced.

2. The utility model discloses a system utilizes the cooling heat drive absorption refrigeration cycle of main refrigeration cycle compressor gas vent high-temperature gas to realize the absorption supercooling refrigerating system of the great super-cooled degree of main refrigeration cycle liquid

3. The utility model discloses absorption-type subcooling refrigerating system absorption refrigeration cycle is lower at subcooler evaporation side evaporating temperature, and the heat transfer difference in temperature between subcooler evaporation side and the subcooler cross the cold side is big, and heat exchange efficiency is high, and main refrigeration cycle liquid refrigerant can obtain great super-cooled rate before the throttle, and the unit refrigerating output is big, and the coefficient of refrigeration is big.

4. The utility model discloses absorption formula subcooling refrigerating system utilizes compressor gas vent high-temperature gas to lean on the high-pressure refrigerant liquid vaporization cooling in the generator, and the cooling effect is good, and the exhaust temperature of compressor is lower, has prolonged compressor life, and absorption heat is in the main refrigeration cycle in the absorber the superheated steam that the low pressure saturated vapor heating that the evaporimeter export came out has certain superheat degree is absorbed by the compressor, both can effectively avoid the compressor wet compression protection compressor, need not provide the cooling heat in the special cooling device cooling absorption refrigeration cycle absorber again.

Drawings

FIG. 1 is a schematic diagram of an absorption subcooling refrigeration system;

in the figure: 1. the system comprises a compressor, 2. a generator, 3. a branch condenser, 4-1. a first throttling device, 4-2. a second throttling device, 4-3. a solution throttling device, 5. an absorber, 6. a subcooler, 7. a main condenser, 8. an evaporator, 9. a solution pump and 10. a solution heat exchanger.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The utility model discloses an absorption-type supercooling refrigerating system includes main refrigeration cycle and absorption-type supercooling refrigeration cycle, the refrigerant cooling heat drive of the compressor gas vent in the main refrigeration cycle absorption-type supercooling cycle. The main refrigeration cycle and the absorption type supercooling refrigeration cycle can respectively adopt the structures in the prior art.

The schematic diagram of the absorption type subcooling refrigeration system of the present embodiment is shown in fig. 1, and the main refrigeration cycle is a refrigeration cycle in which the compressor 1, the refrigerant side passage of the generator 2, the main condenser 7, the subcooling side passage of the subcooler 6, the first throttling device 4-1, the evaporator 8, and the refrigerant side passage of the absorber 5 are sequentially connected and then return to the compressor 1. The absorption type supercooling cycle comprises a branch condenser 3, a solution heat exchanger 10, a solution pump 9, a second throttling device 4-2, a third throttling device 4-3, a generator 2, a subcooler 6 and an absorber 5, wherein a cold side outlet of the solution heat exchanger 10 is connected with a solution inlet of the generator 2, a hot side inlet of the solution heat exchanger 10 is connected with a solution outlet of the generator 2, a hot side outlet of the solution heat exchanger 10 is connected with a solution inlet of the absorber 5 through the third throttling device 4-3, and a solution outlet of the absorber 5 is connected with a cold side inlet of the solution heat exchanger 10 through the solution pump 9. The gas outlet of the generator 2 is connected with the evaporation side inlet of the subcooler 6 through the branch condenser 3 and the second throttling device 4-2, and the evaporation side outlet of the subcooler 6 is connected with the gas inlet of the absorber 5.

The utility model discloses an absorption-type supercooling refrigerating system is divided into main refrigeration cycle and absorption-type supercooling refrigeration cycle. The thermodynamic process of the main refrigeration cycle is as follows: the suction end of the compressor 1 sucks the low-pressure superheated refrigerant gas heated by the solution in the absorber 5 from the refrigerant outlet of the absorber 5, the refrigerant gas is compressed and boosted by the compressor 1 to become high-temperature high-pressure superheated vapor, the high-temperature high-pressure superheated vapor is discharged into the generator 2 from the discharge end of the compressor 1 through the refrigerant inlet of the generator, the high-temperature high-pressure superheated vapor is cooled in the generator 2 to release heat to become high-pressure saturated vapor, the high-temperature high-pressure superheated vapor enters the main condenser 7 from the refrigerant outlet of the generator 2, and the high-pressure saturated vapor is condensed into high-pressure liquid in the main condenser 7. High-pressure liquid enters the subcooler 6 through a subcooling side inlet of the subcooler 6, the high-pressure liquid is subcooled in the subcooler 6 to be changed into low-temperature unsaturated liquid, the unsaturated liquid is throttled and depressurized by the first throttling device 4-1 to be changed into low-temperature low-pressure wet vapor to enter the evaporator 8 for evaporation and heat absorption, and the low-pressure saturated vapor coming out of the evaporator 8 enters the absorber 5 through a refrigerant inlet of the absorber 5 to be changed into superheated vapor to be absorbed by the compressor 1 to finish the thermodynamic process of a main refrigeration cycle. The thermodynamic process of the subcooling refrigeration cycle is: the solution rich in refrigerant in the generator 2 is heated by high-temperature and high-pressure superheated steam discharged by the compressor 1 in the main refrigeration cycle, so that the refrigerant in the solution is generated in a high-pressure gas state and enters the branch condenser 3 for condensation, the condensed high-pressure liquid is throttled and decompressed by the second throttling device 4-2 and enters the evaporator side of the subcooler 6 for evaporation and heat absorption, the temperature of the liquid refrigerant at the subcooled side of the subcooler 6 in the main refrigeration cycle is reduced, and the higher subcooling degree is realized. The solution generated in the generator 2 is restored to the original components again, flows into the solution heat exchanger 10 from the solution outlet of the generator 2, is cooled by the solution heat exchanger 10, is throttled by the solution throttling device 4-3, is changed into absorption liquid with absorption capacity, enters the absorber 5 from the solution inlet of the absorber 5, absorbs low-pressure refrigerant vapor from the evaporation side of the subcooler 6, heats low-pressure saturated vapor coming out of the outlet of the evaporator 8 in the main refrigeration cycle to superheated vapor along with released absorption heat in the absorption process, and completes the subcooling refrigeration cycle.

The compressor is any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.

The branch condenser and the main condenser can be in an integrated parallel connection mode, or in a single mode, and can be an air-cooled condenser, a water-cooled condenser or an evaporative condenser.

The evaporator is air-cooled or solution-cooled.

The first throttling device, the second throttling device and the solution throttling device are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttling devices.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An absorption supercooling refrigeration system, which is characterized by comprising a main refrigeration cycle and an absorption supercooling refrigeration cycle, wherein the absorption supercooling cycle is driven by the cooling heat of a refrigerant at a compressor exhaust port in the main refrigeration cycle.

2. The absorption subcooling refrigeration system according to claim 1, wherein the main refrigeration cycle is a refrigeration cycle in which the compressor, the refrigerant-side passage of the generator, the main condenser, the subcooling-side passage of the subcooler, the first throttling means, the evaporator and the refrigerant-side passage of the absorber are connected in sequence and then returned to the compressor; the absorption type supercooling cycle comprises a branch condenser, a solution heat exchanger, a solution pump, a second throttling device, a third throttling device, the generator, the subcooler and the absorber, wherein a cold side outlet of the solution heat exchanger is connected with a solution inlet of the generator, a hot side inlet of the solution heat exchanger is connected with a solution outlet of the generator, a hot side outlet of the solution heat exchanger is connected with a solution inlet of the absorber through the third throttling device, and a solution outlet of the absorber is connected with a cold side inlet of the solution heat exchanger through the solution pump; and a gas outlet of the generator is connected with an evaporation side inlet of the subcooler through the branch condenser and the second throttling device, and an evaporation side outlet of the subcooler is connected with the gas inlet of the absorber.

3. The absorption subcooling refrigeration system as described in claim 2, wherein the branch condenser and the main condenser are air-cooled condensers, water-cooled condensers, or evaporative condensers.

4. The absorption subcooling refrigeration system as described in claim 2, wherein the evaporator is air-cooled or solution-cooled.

5. The absorption subcooling refrigeration system of claim 2, wherein the subcooler and generator are plate heat exchangers, tube-in-tube heat exchangers, or shell and tube heat exchangers.