CN210089182U - Absorption subcooling refrigeration system - Google Patents

Abstract

The utility model discloses an absorption type subcooling refrigeration system, which aims to provide a refrigeration system capable of realizing a large subcooling degree and low operating cost. It includes a main refrigeration cycle and an absorption subcooling refrigeration cycle. The refrigerant cooling heat of the compressor discharge port in the main refrigeration cycle drives the absorption subcooling cycle. The main refrigeration cycle consists of the compressor, the refrigerant side passage of the generator, the main condenser, the subcooled side passage of the subcooler, the first throttling device, the evaporator, and the refrigerant side passage of the absorber, which are connected in sequence and then returned to the main refrigeration cycle. The refrigeration cycle of the compressor; the absorption subcooling cycle includes 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 system of the utility model utilizes the cooling heat of the high temperature gas at the exhaust port of the compressor to heat the solution rich in refrigerant in the generator, the absorption type supercooling cycle effectively utilizes the waste heat, no other energy input is required, and the operation cost is low.

Description

Absorption subcooling refrigeration system

technical field

The utility model relates to the technical field of refrigeration, in particular to a refrigeration system with a refrigerant cooling heat-driven absorption type subcooling cycle with a compression exhaust port for liquid subcooling.

Background technique

In the practical application of the single-stage compressed vapor refrigeration cycle, the thermal perfection of the cycle can be improved by measures such as liquid subcooling, vapor superheating, and the resulting regenerative cycle. The traditional liquid subcooling process can be realized by increasing the area of the condenser. Since the heat exchange medium does not change in this way, it is necessary to greatly increase the heat exchange area of the condenser to reduce the heat exchange temperature difference, in order to achieve a higher condenser outlet. With low liquid temperature, the degree of subcooling obtained by only relying on the condenser to achieve subcooling has a certain limit, and it increases the heat exchange area of the condenser and increases the initial investment cost, which is not suitable for large refrigeration systems. Another way to achieve the liquid subcooling process is to add a subcooler after the condenser to increase the degree of subcooling. The subcooler often requires a lower temperature fluid to exchange heat with the refrigerant to achieve liquid subcooling of the refrigerant. However, Lower temperature fluids are often not available. For small refrigeration systems, a regenerator is added to realize heat exchange between the liquid refrigerant at the outlet of the condenser and the refrigerant at the outlet of the evaporator. While the regenerator realizes liquid subcooling, it also increases the labor consumption of the compressor and the heat recovery. Whether the cooling coefficient of the cycle is improved depends on the physical properties of the refrigerant. For large refrigeration systems, adding a subcooling refrigeration device, that is, adding a small refrigeration system to exchange heat between the evaporator and the liquid at the condenser outlet of the large refrigeration system to achieve a greater degree of subcooling. Small refrigeration units increase input and operating costs.

In the refrigeration cycle, the compressor discharges high-temperature gas during operation. This part of the high-temperature gas enters the condenser and passes through the cooling process. The condensation process transfers heat to the condensing medium and becomes a high-pressure liquid. The refrigerant in the cooling process is always high-temperature gas. , occupies a large amount of space in the condenser, and whether the cooling process is fully carried out directly affects the exhaust 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 compressor exhaust port, prolong the life of the refrigeration compressor, and use energy reasonably is an effective way to improve the performance of the refrigeration system.

Utility model content

The purpose of the present utility model is to provide an absorption type subcooling refrigeration system that can achieve a large degree of subcooling and low operating cost, aiming at the technical defects existing in the prior art.

The technical scheme adopted for realizing the purpose of the present utility model is:

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

The main refrigeration cycle is composed of the compressor, the refrigerant side passage of the generator, the main condenser, the subcooled side passage of the subcooler, the first throttling device, the evaporator, and the refrigerant side passage of the absorber. After connection, it returns to the refrigeration cycle of the compressor; the absorption subcooling cycle includes a branch condenser, a solution heat exchanger, a solution pump, a second throttling device, a third throttling device, the generator, the In the subcooler and the absorber, the cold side outlet of the solution heat exchanger is connected to the solution inlet of the generator, and the hot side inlet of the solution heat exchanger is connected to the solution outlet of the generator, so The hot side outlet of the solution heat exchanger is connected to the solution inlet of the absorber through the third throttling device, and the solution outlet of the absorber is connected to the cold side inlet of the solution heat exchanger through the solution pump ; The gas outlet of the generator is connected to the evaporation side inlet of the subcooler through the branch condenser and the second throttling device, and the evaporation side outlet of the subcooler is connected to the absorber gas inlet connect.

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, subcooler and generator are plate heat exchangers, casing heat exchangers or shell and tube heat exchangers.

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

1. The absorption subcooling refrigeration system of the present utility model utilizes the cooling heat of the high-temperature gas at the compressor exhaust port to heat the solution rich in refrigerant in the generator, and the absorption subcooling cycle effectively utilizes the waste heat, without other energy input, and the operating 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, which reduces the heat exchange area of the main condenser and reduces the investment cost.

2. The system of the present invention utilizes the cooling heat of the high-temperature gas at the exhaust port of the main refrigeration cycle compressor to drive the absorption refrigeration cycle to realize the absorption type subcooling refrigeration system with a large subcooling degree of the main refrigeration cycle liquid

3. The absorption type refrigeration cycle of the absorption type subcooling refrigeration system of the present invention has a lower evaporation temperature on the evaporation side of the subcooler, and the heat exchange temperature difference between the evaporation side of the subcooler and the subcooler side of the subcooler is large, and the heat exchange efficiency is high. The liquid refrigerant in the main refrigeration cycle can obtain a large subcooling degree before throttling, the unit refrigeration capacity is large, and the refrigeration coefficient is large.

4. The absorption subcooling refrigeration system of the present invention utilizes the high-temperature gas at the exhaust port of the compressor to be vaporized and cooled by the high-pressure refrigerant liquid in the generator. The cooling effect is good, the exhaust temperature of the compressor is lower, and the service life of the compressor is prolonged. The absorption heat in the absorber heats the low-pressure saturated steam from the outlet of the evaporator in the main refrigeration cycle. The superheated steam with a certain degree of superheat is absorbed by the compressor, which can effectively avoid the wet compression of the compressor and protect the compressor, and does not need to provide special The cooling device cools the cooling heat in the absorption refrigeration cycle absorber.

Description of drawings

Figure 1 shows the schematic diagram of the absorption subcooling refrigeration system;

In the figure: 1. Compressor, 2. Generator, 3. Condenser, 4-1. First throttling device, 4-2. Second throttling device, 4-3. Solution throttling device, 5. Absorber, 6. Subcooler, 7. Main condenser, 8. Evaporator, 9. Solution pump, 10. Solution heat exchanger.

Detailed ways

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

The absorption type subcooling refrigeration system of the present invention comprises a main refrigeration cycle and an absorption type subcooling refrigeration cycle, and the cooling heat of the refrigerant in the compressor exhaust port in the main refrigeration cycle drives the absorption type subcooling cycle. Wherein, the main refrigeration cycle and the absorption subcooling refrigeration cycle can respectively adopt the structures in the prior art.

The schematic diagram of the absorption subcooling refrigeration system in this embodiment is shown in FIG. 1 , the main refrigeration cycle is composed of the compressor 1 , the refrigerant side channel of the generator 2 , the main condenser 7 , and the subcooler The subcooling side passage of 6 , the first throttling device 4 - 1 , the evaporator 8 , and the refrigerant side passage of the absorber 5 are connected in sequence and then return to the refrigeration cycle of the compressor 1 . The absorption subcooling cycle includes 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, the generator 2, and a subcooler. 6 and absorber 5, the cold side outlet of the solution heat exchanger 10 is connected with the solution inlet of the generator 2, the hot side inlet of the solution heat exchanger 10 is connected with the solution outlet of the generator 2, The hot side outlet of the solution heat exchanger 10 is connected to the solution inlet of the absorber 5 through the third throttling device 4-3, and the solution outlet of the absorber 5 is connected to the solution pump 9 through the solution pump 9. The cold side inlet of the solution heat exchanger 10 is connected. The gas outlet of the generator 2 is connected to 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 to the The gas inlet of absorber 5 is connected.

The absorption subcooling refrigeration system of the utility model is divided into a main refrigeration cycle and an absorption subcooling refrigeration cycle. The thermal 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 through the refrigerant outlet of the absorber 5, and the refrigerant gas After being compressed and boosted by the compressor 1, the superheated vapor that becomes high temperature and high pressure is discharged into the generator 2 from the exhaust end of the compressor 1 through the refrigerant inlet of the generator. The cooling and exothermic heat in the generator 2 becomes high-pressure saturated vapor, which enters the main condenser 7 from the refrigerant outlet of the generator 2, and the high-pressure saturated vapor condenses in the main condenser 7 to become high-pressure liquid. The high-pressure liquid enters the sub-cooler 6 through the sub-cooling side inlet of the sub-cooler 6, and the high-pressure liquid is sub-cooled in the sub-cooler 6 to become an unsaturated liquid with a lower temperature, and the unsaturated liquid passes through the sub-cooler 6. The first throttling device 4-1 throttles and depressurizes the wet vapor with low temperature and low pressure, and enters the evaporator 8 to evaporate and absorb heat. The heat exchange between the absorber 5 and the solution in the absorber 5 becomes superheated vapor and is sucked by the compressor 1 to complete the thermodynamic process of the main refrigeration cycle. The thermal process of the subcooling refrigeration cycle is: the refrigerant-rich solution in the generator 2 is heated by the high-temperature and high-pressure superheated steam discharged from the compressor 1 in the main refrigeration cycle, so that the refrigerant in the solution is generated in a high-pressure gaseous state. out, enter the said branch condenser 3 to condense, the condensed high-pressure liquid is throttled and depressurized by the said second throttling device 4-2 and enters the said subcooler 6 evaporating side to evaporate and absorb heat, reducing the heat in the main refrigeration cycle. The temperature of the liquid refrigerant on the subcooling side of the subcooler 6 achieves a greater degree of subcooling. The solution generated in the generator 2 is restored to its original composition, and flows into the solution heat exchanger 10 from the solution outlet of the generator 2, and is cooled by the solution heat exchanger 10. The solution throttling device 4-3 After throttling, the absorption liquid with absorption capacity enters the absorber 5 through the solution inlet of the absorber 5, absorbs the low-pressure refrigerant vapor from the evaporation side of the subcooler 6, and releases it during the absorption process The heat of absorption heats the low-pressure saturated steam from the outlet of the evaporator 8 in the main refrigeration cycle to superheated steam to complete the subcooling refrigeration cycle.

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

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

The evaporator is air-cooled or solution-cooled.

The superheater, subcooler and generator are plate heat exchangers, casing heat exchangers or shell and tube heat exchangers.

The first throttling device, the second throttling device and the solution throttling device are electronic expansion valve, thermal expansion valve, capillary tube or orifice plate throttling device.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. Improvement and modification should also be regarded as the protection scope of the present invention.

Claims (5)

1. An absorption type subcooling refrigeration system, characterized in that it comprises a main refrigeration cycle and an absorption type subcooling refrigeration cycle, and the refrigerant cooling heat of the compressor discharge port in the main refrigeration cycle drives the absorption type subcooling refrigeration cycle. cold cycle. 2 . The absorption type subcooling refrigeration system according to claim 1 , wherein the main refrigeration cycle consists of the compressor, the refrigerant side channel of the generator, the main condenser, and the subcooler of the subcooler. 3 . The side channel, the first throttling device, the evaporator and the refrigerant side channel of the absorber are connected in sequence and then return to the refrigeration cycle of the compressor; the absorption subcooling cycle includes a branch condenser, a solution heat exchanger, a solution a pump, a second throttling device, a third throttling device, the generator, the subcooler and the absorber, the cold side outlet of the solution heat exchanger is connected to the solution inlet of the generator, The hot side inlet of the solution heat exchanger is connected to the solution outlet of the generator, and the hot side outlet of the solution heat exchanger is connected to the solution inlet of the absorber through the third throttling device, and the absorber is connected to the solution inlet of the absorber. The solution outlet of the generator is connected to the cold side inlet of the solution heat exchanger through the solution pump; the gas outlet of the generator passes through the evaporation of the sub-condenser and the second throttling device and the subcooler. The side inlet is connected, and the evaporation side outlet of the subcooler is connected with the absorber gas inlet. 3 . The absorption subcooling refrigeration system according to claim 2 , wherein the branch condenser and the main condenser are air-cooled condensers, water-cooled condensers or evaporative condensers. 4 . 4 . The absorption type subcooling refrigeration system according to claim 2 , wherein the evaporator is of an air-cooled type or a solution-cooled type. 5 . 5 . The absorption type subcooling refrigeration system according to claim 2 , wherein the subcooler and the generator are a plate heat exchanger, a casing heat exchanger or a shell and tube heat exchanger. 6 .

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