A method for reducing liquid carryover at the inlet of a screw propylene compressor

Abstract

The present application relates to the technical field of screw compressor, and particularly discloses a method for reducing liquid propylene at the inlet of a screw propylene compressor, which comprises the following steps: adding a three-way valve to the pipeline from the propylene flash tank to the propylene subcooler, leading a liquid propylene pipeline to the lower part of the suction buffer tank at the inlet of the compressor, adding a floating head type U-shaped heat exchange tube bundle and a partition plate head to the bottom, connecting the liquid propylene to the inlet side, and heating the liquid propylene to be gaseous propylene by heat exchange between the U-shaped heat exchange tube bundle and the propylene liquid at the bottom of the suction buffer tank, so that the gaseous propylene enters the inlet of the compressor, the occurrence of the liquid propylene is reduced, the safety and stability of the unit operation are improved, the liquid propylene after heat exchange is led out from the other side of the bottom of the suction buffer tank, connected to the main pipeline after the three-way valve, and then enters the propylene subcooler, the temperature value at the outlet of the U-shaped heat exchange tube of the suction buffer tank is adjusted to the liquid propylene flow of the U-shaped heat exchange tube by the three-way valve, so that the temperature setting is automatically adjusted, and energy saving and consumption reduction are achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of screw compressors, and particularly relates to a method for reducing liquid carrying at the inlet of a screw propylene compressor. BACKGROUND

[0002] The working process of a screw compressor is composed of suction, sealed conveying, compression oil injection and exhaust steps. A buffer tank is arranged at the inlet to stably supply gas. An oil separator at the outlet separates and recovers the lubricating oil injected into the compressor from the gaseous propylene. The load increase and decrease of the compressor is controlled by an energy regulating slide valve, and automatic regulation can be realized. The working principle of propylene refrigeration is that the propylene refrigeration cycle process is compression, condensation, pressure reduction and evaporation. The gaseous propylene is pressurized to about 1.73 MPaG by a propylene compressor. The superheated gaseous propylene is condensed into saturated liquid propylene by circulating cooling water. The condensation temperature of the propylene is about 40 DEG C. The liquid propylene is depressurized in a throttle valve by the throttling and expansion principle, so that the liquid phase boiling point of the liquid propylene is reduced. The liquid propylene is evaporated into gaseous propylene in a heat exchanger, and at the same time, the heat of the user is absorbed, so that the purpose of refrigeration and cooling is achieved.

[0003] At present, in order to provide 2536-2778KW of cold energy for low-temperature methanol washing, a motor-driven screw compressor C04701 is needed to be added as a standby machine of the centrifugal propylene compressor C04301. The design parameters of the screw compressor are that the compressor inlet pressure is 0.007 MPaG, the temperature is-46 DEG C, the inlet propylene gas amount is 30975 kg / h, the make-up gas amount is 12010 kg / h, the outlet pressure is 1.73 MPaG, the outlet temperature is 82.7 DEG C, the main motor of the compressor is 10KV, and the rated power is 3150KW. During the commissioning of the screw compressor C04701, the suction buffer tank often has liquid carrying. The liquid carrying often occurs when the process load changes. When the load increases, the inlet suction flow increases, the liquid propylene in the low-temperature methanol washing propylene cryogenic cooler is not completely gasified, on the other hand, three of the five low-temperature methanol washing propylene cryogenic coolers are installed higher than the suction buffer tank of the screw propylene compressor C04701, the gas propylene pipeline is not designed according to the upward slope, and the pipeline is long and easy to form a liquid bag, which leads to the liquid carrying of the suction buffer tank, and is not conducive to the safe, stable and long-period operation of the unit. Therefore, a method for reducing the liquid carrying at the inlet of the screw propylene compressor is needed to solve the above problems, so that the suction buffer tank has a heating function, the liquid propylene carried into the buffer tank is heated and evaporated into gaseous propylene, the liquid carrying is reduced, and the safety and stability of the unit operation are improved. SUMMARY

[0004] The purpose of the present application is to provide a method for reducing the liquid entrainment at the inlet of a screw propylene compressor, an air suction buffer tank with heating function, so that the liquid propylene brought into the buffer tank is heated and evaporated into gaseous propylene through the heat exchange pipe, reducing the occurrence of liquid entrainment, improving the safety and stability of the unit operation, to solve the problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A method for reducing the liquid entrainment at the inlet of a screw propylene compressor, comprising the following steps:

[0007] S1, a three-way valve is added to the pipeline connecting the propylene flash tank to the propylene subcooler, the other end of the three-way valve is connected to the lower part of the air suction buffer tank of the compressor inlet, and the upper end of the air suction buffer tank is connected to the propylene compressor;

[0008] S2, a floating head type U-shaped heat exchange tube bundle and a partition plate head are added to the bottom of the air suction buffer tank, the inlet end of the floating head type U-shaped heat exchange tube bundle is connected to the liquid propylene, and the other side of the floating head type U-shaped heat exchange tube bundle is connected to the main pipeline after the three-way valve and then enters the propylene subcooler;

[0009] S3, the gaseous propylene of the methanol washing section enters the propylene compressor after gas-liquid separation in the air suction buffer tank, and the gaseous propylene is produced;

[0010] S4, after the gaseous propylene is condensed by the propylene condenser, the condensed liquid enters the propylene receiving tank, and the uncondensed gas enters the inert gas cooler;

[0011] S5, the liquid in the propylene receiving tank is depressurized by a throttle valve and then enters the propylene flash tank, the gaseous propylene after flashing enters the second gas addition section of the propylene compressor, a part of the liquid after flashing enters the air suction buffer tank for heat exchange through the three-way valve, the liquid after heat exchange is combined with the main pipeline of the three-way valve and then enters the propylene subcooler, and the other part of the liquid after flashing enters the propylene subcooler for flashing and cooling, and the gaseous propylene obtained by flashing and cooling enters the air suction buffer tank.

[0012] Preferably, a spiral guide vane is arranged at the inlet of the air suction buffer tank, a wire mesh demisting layer is arranged at the top of the air suction buffer tank, a liquid level meter and an automatic liquid discharge valve are arranged at the bottom of the air suction buffer tank, and the temperature of the gaseous phase after gas-liquid separation in the air suction buffer tank is-43℃ to-46.42℃.

[0013] Preferably, the propylene compressor is provided as two, the two propylene compressors are arranged in parallel, the upper ends of the air suction buffer tanks are connected to the two propylene compressors, and the inlet ends of the propylene subcoolers are connected to the outlet ends of the two propylene compressors.

[0014] Preferably, the pipeline communicating the suction buffer tank with the propylene compressor communicates with an inert gas cooler, the inert gas cooler further cools the propylene in the non-condensed gas, the cooled liquid propylene returns to the propylene receiving tank, the non-condensed gas not condensed is discharged to the propylene torch, and an inert gas vent valve is installed on the pipeline communicating the inert gas cooler with the propylene torch.

[0015] Preferably, the propylene compressor is a two-stage compression, and the propylene compressor produces gaseous propylene with a pressure of 1.72 MPaG-1.74 MPaG and a temperature of 82.7℃-93.15℃ after two-stage compression.

[0016] Preferably, the throttle valve is located on the pipeline communicating the propylene receiving tank with the propylene flash tank, the inlet end of the throttle valve communicates with the inlet of the inert gas cooler through a shell side liquid level control valve, and the outlet end of the throttle valve communicates with the liquid outlet of the inert gas cooler through a tube side adjusting valve.

[0017] Preferably, the propylene condenser is communicated with a cooling water supply pipe and a cooling water return pipe, and water valves are installed on the cooling water supply pipe and the cooling water return pipe, and the gas outlet end of the propylene condenser communicates with the gas inlet end of the inert gas cooler.

[0018] Preferably, the propylene condenser condenses at a pressure of 1.59 MPaG-1.66 MPaG and a temperature of 40℃-42℃.

[0019] Preferably, the liquid propylene in the propylene receiving tank enters the propylene flash tank after pressure reduction by the throttle valve at a pressure of 0.5 MPaG-0.6 MPaG, and the gaseous propylene flashed out of the propylene flash tank returns to the second-stage gas feeding section of the propylene compressor at a temperature of 0.8℃-1.21℃.

[0020] Preferably, a part of the liquid propylene in the propylene flash tank enters the U-shaped heat exchange pipe of the suction buffer tank through a three-way valve bypass at a temperature of 0.8℃-1℃, exchanges heat with the liquid propylene in the tank, and then merges with the three-way valve main road to enter the propylene supercooler pipe at a temperature of -10℃ to -11℃ and a pressure of 0.49 MPaG-0.5 MPaG, and the acidic gas removal unit in the propylene supercooler serves as a refrigerant for users, and the gaseous propylene discharged from the acidic gas removal unit cryogenic cooler reenters the refrigeration unit for circulation.

[0021] The method for reducing the liquid entrainment at the inlet of the screw propylene compressor has the following advantages compared with the prior art:

[0022] 1. The method for reducing liquid entrainment at the inlet of a screw propylene compressor according to the present application comprises the following steps:

[0023] 2. The liquid propylene after heat exchange is led out from the other side of the bottom of the suction buffer tank and connected to the main pipeline after the three-way valve, and then enters the propylene subcooler. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The flow chart of the present application is shown in the figure;

[0025] Figure 2 The schematic diagram of the principle of the present application is shown in the figure;

[0026] Figure 3 The structure of the suction buffer tank of the present application is shown in the figure. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] The present application provides a method for reducing liquid entrainment at the inlet of a screw propylene compressor, as shown in the figure, comprising the following steps: Figures 1-3

[0029] S1. A three-way valve is added to the pipeline connecting the propylene flash tank to the propylene subcooler, and the other end of the three-way valve is connected to the lower part of the suction buffer tank of the compressor inlet. The upper end of the suction buffer tank is connected to the propylene compressor.

[0030] ​Spiral guide vanes are arranged at the inlet of the suction buffer tank, and a cyclone is formed through the spiral guide vanes, which is similar to cyclone separation, and the centrifugal force separation effect is enhanced. A wire mesh demisting layer is arranged at the top of the suction buffer tank, which is used for capturing liquid droplets with a particle size of less than 10 um. A liquid level meter and an automatic liquid discharge valve are arranged at the bottom of the suction buffer tank, which are used for monitoring and discharging accumulated liquid in real time, so as to avoid liquid entrainment caused by high liquid level. The liquid discharge frequency is dynamically adjusted according to the propylene dew point temperature and the propylene compressor load. The gas phase temperature after gas-liquid separation of the suction buffer tank is -43℃ to -46.42℃.

[0031] The propylene compressor is provided as two, and the two propylene compressors are arranged in parallel. One propylene compressor is a normally used machine driven by a motor (such as Figure 2 C04701), and the other propylene compressor is a standby machine of the centrifugal propylene compressor (such as Figure 2 C04301), and the upper ends of the suction buffer tanks are communicated with the two propylene compressors. The inlet ends of the propylene subcoolers are communicated with the outlet ends of the two propylene compressors. The propylene compressor is a two-stage compression, and the propylene compressor produces gas propylene with a pressure of 1.72MPaG-1.74MPaG and a temperature of 82.7℃-93.15℃ after two-stage compression.

[0032] As shown in Figure 2 , the pipeline, in which the suction buffer tank is communicated with the propylene compressor, is communicated with the inert gas cooler. The inert gas cooler further cools the propylene in the incondensable gas. The cooled liquid propylene returns to the propylene receiving tank, and the incondensable gas that is not condensed is discharged to the propylene torch. An inert gas vent valve PV-04308 is installed on the pipeline, in which the inert gas cooler is communicated with the propylene torch, for venting the condensed inert gas through the valve to the torch in the pipeline of the equipment in the pipeline of the inert gas cooler E04305.

[0033] S2, a floating head type U-shaped heat exchange tube bundle and a partition plate head are added at the bottom of the suction buffer tank, as shown in Figure 3 , the inlet end of the floating head type U-shaped heat exchange tube bundle is connected with liquid propylene, the other side of the floating head type U-shaped heat exchange tube bundle is connected with the main pipeline after the three-way valve, and then enters the propylene subcooler. The outlet end of the three-way valve TV04701 is communicated with the propylene subcooler through the propylene subcooler liquid level control valve LV-04306. The liquid propylene passing through the propylene subcooler liquid level control valve LV-04306 evaporates and absorbs heat to become gas propylene in the shell side of the propylene subcooler E04302, and then enters the suction buffer tank V04701 of the compressor inlet;

[0034] S3, the gas propylene in the methanol washing section is compressed in the propylene compressor after gas-liquid separation in the suction buffer tank, and gas propylene is produced;

[0035] S4, the propylene gas is condensed by the propylene condenser, and the condensed liquid enters a propylene receiving tank, and the uncondensed gas enters an inert gas cooler;

[0036] The propylene condenser is connected with a cooling water supply pipe and a cooling water return pipe, and water valves are installed on the cooling water supply pipe and the cooling water return pipe. The outlet end of the propylene condenser is communicated with the inlet end of the inert gas cooler. The condensing pressure of the propylene condenser is 1.59 MPaG-1.66 MPaG, and the temperature is 40℃-42℃.

[0037] The liquid propylene in the propylene receiving tank is depressurized by a throttle valve, and then enters a propylene flash tank at a pressure of 0.5 MPaG-0.6 MPaG. The temperature of the propylene gas flashed out of the propylene flash tank is 0.8℃-1.21℃, and the propylene gas returns to the second gas-adding section of the propylene compressor.

[0038] S5, the liquid in the propylene receiving tank is depressurized by a throttle valve and enters a propylene flash tank, and the gas after flashing returns to the second gas-adding section of the propylene compressor. A part of the liquid after flashing enters an air suction buffer tank for heat exchange through a three-way valve, and then the heat-exchanged liquid is combined with the main road of the three-way valve and enters a propylene subcooler. Another part of the liquid after flashing enters the propylene subcooler for flash cooling, and the propylene gas obtained by flash cooling enters the air suction buffer tank.

[0039] The throttle valve is located on the communication pipeline between the propylene receiving tank and the propylene flash tank. The inlet end of the throttle valve is communicated with the inlet of the inert gas cooler E-04305 through a shell-side liquid level control valve LV-04308. The liquid propylene passing through the shell-side liquid level control valve LV-04308 is evaporated and heat-absorbed in the shell side of the inert gas cooler E-04305 to become gas propylene, which enters the inlet air suction buffer tank V04701 of the compressor. The outlet end of the throttle valve is communicated with the liquid outlet end of the inert gas cooler E-04305 through a tube-side regulating valve LV-04310. The liquid propylene after being cooled by the liquid propylene passing through the shell-side liquid level control valve LV-04308 in the tube side of the inert gas cooler E-04305 (tube-shell side heat exchange of the inert gas cooler E-04305) returns to the propylene flash tank V-04302 through the tube-side regulating valve LV-04310.

[0040] A part of the liquid propylene in the propylene flash tank is bypassed into the U-shaped heat exchange pipe of the air suction buffer tank through a three-way valve at a temperature of 0.8℃-1℃, and exchanges heat with the liquid propylene in the tank. After heat exchange, it is combined with the main road of the three-way valve and enters the propylene subcooler tube side, the temperature is reduced to-10℃ to-11℃, and the pressure is 0.49 MPaG-0.5 MPaG. The acidic gas removal unit in the propylene subcooler serves as a refrigerant for users. The gaseous propylene absorbed from the acidic gas removal unit cryogenic cooler enters the refrigeration unit for circulation.

[0041] In operation, as shown in Figure 2 The gaseous propylene from the low temperature methanol washing section enters the propylene compressor C04701 through the inlet gas buffer tank V04701 after gas-liquid separation, with a gas phase temperature of -43°C to -46.42°C. After two-stage compression, gaseous propylene with a pressure of 1.72 MPaG to 1.74 MPaG and a temperature of 82.7°C to 93.15°C is produced. The gaseous propylene is condensed by the propylene condenser E04301. The condensed liquid propylene with a pressure of 1.59 MPaG to 1.66 MPaG and a temperature of 40°C to 42°C enters the propylene receiving tank V04301. The uncondensed gas is mixed with the incondensable gas from the propylene receiving tank V04301 and enters the inert gas cooler E04305.

[0042] The liquid propylene from the propylene receiving tank V04301 enters the propylene flash tank V04302 after pressure reduction by the throttle valve LV04304, with a pressure of 0.5 MPaG to 0.6 MPaG. The flashed gaseous propylene with a temperature of 0.8°C to 1.21°C returns to the second-stage gas feeding section of the propylene compressor C04701. The liquid propylene from the propylene flash tank V04302 is divided into two parts. One part of the liquid propylene with a temperature of 0.8°C to 1°C enters the U-shaped heat exchange tube of the suction buffer tank V04701 through the bypass of the three-way valve TV04701 and exchanges heat with the liquid propylene in the tank. After heat exchange, it is combined with the main road of the three-way valve TV04701 and enters the propylene subcooler E04302 tube side, with a temperature of -10°C to -11°C and a pressure of 0.49 MPaG to 0.5 MPaG. It enters the acid gas removal unit as a refrigerant for user use. The gaseous propylene from the acid gas removal unit cryogenic absorber enters the refrigeration unit for circulation. The other part of the liquid propylene enters the propylene subcooler E04302 shell side to flash and cool the liquid propylene in the tube side. The gaseous propylene from the shell side liquid propylene flash enters the suction buffer tank V04701.

[0043] The propylene condenser E04301 and the incondensable gas in the propylene receiving tank V04301 enter the inert gas cooler E04305 tube side, which is cooled to -35°C to -37°C by evaporation of the liquid propylene from the propylene receiving tank. The propylene in the incondensable gas is further cooled. The cooled liquid propylene returns to the propylene receiving tank. The incondensable gas that is not condensed is released to the propylene flare.

[0044] In summary, by adding a three-way valve TV04701 to the propylene flash tank V04302 to propylene subcooler E04302 pipeline, a liquid propylene pipeline is led to the lower part of the compressor inlet suction buffer tank V04701, a floating head U-shaped heat exchange tube bundle is added to the bottom, and a partitioned head is added, the inlet side is connected to liquid propylene, 1℃ liquid propylene enters the U-shaped heat exchange tube bundle and exchanges heat with the propylene liquid-43℃ at the bottom of the suction buffer tank V04701, the liquid part of the liquid propylene is heated to gas propylene entering the propylene compressor C04701 inlet, reducing the occurrence of liquid carrying, improving the safety and stability of the unit operation, the liquid propylene after heat exchange is led out from the other side of the bottom of the suction buffer tank V04701 and connected to the main pipeline after the three-way valve TV04701 to merge and enter the propylene subcooler E04302, through the outlet temperature value of the U-shaped heat exchange tube of the suction buffer tank V04701, the three-way valve TV04701 is adjusted to the liquid propylene flow of the U-shaped heat exchange tube to automatically adjust the temperature setting, without additional steam heating, using propylene self-heating, achieving energy saving and consumption reduction, also reducing the number of propylene condensate pump start-ups, reducing the occurrence of pump cavitation leakage.

[0045] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified to the technical solutions recorded in the foregoing embodiments, or equivalent replacement of some technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A method for reducing liquid carryover at the inlet of a screw propylene compressor, characterized in that: Includes the following steps: S1. Add a three-way valve to the pipeline connecting the propylene flash tank to the propylene subcooler, and connect the other end of the three-way valve to the lower part of the compressor inlet suction buffer tank. The upper end of the suction buffer tank is connected to the propylene compressor. S2. Add a floating head U-shaped heat exchange tube bundle and a baffle end cap to the bottom of the intake buffer tank. Connect the inlet end of the floating head U-shaped heat exchange tube bundle to liquid propylene. Connect the other side of the floating head U-shaped heat exchange tube bundle to the main pipeline after the three-way valve and then enter the propylene subcooler. S3. After gas-liquid separation in the methanol washing section, the gaseous propylene enters the propylene compressor for compression to produce gaseous propylene. S4. After the gaseous propylene is condensed by the propylene condenser, the condensed liquid enters the propylene receiving tank, and the uncondensed gas enters the inert gas cooler. S5. The liquid in the propylene receiving tank is depressurized by the throttle valve and then enters the propylene flash tank. After flash evaporation, the gas returns to the second stage of the propylene compressor. Part of the liquid after flash evaporation enters the suction buffer tank for heat exchange through the three-way valve. The liquid after heat exchange is then combined with the main line of the three-way valve and enters the propylene subcooler. The other part of the liquid after flash evaporation enters the propylene subcooler for flash evaporation and cooling. The gaseous propylene obtained from flash evaporation and cooling enters the suction buffer tank.

2. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 1, characterized in that: The inlet of the air intake buffer tank is equipped with a spiral guide vane, the top of the air intake buffer tank is equipped with a wire mesh defoaming layer, and the bottom of the air intake buffer tank is equipped with a level gauge and an automatic drain valve. The gas phase temperature after gas-liquid separation in the air intake buffer tank is -43℃ to -46.42℃.

3. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 1, characterized in that: The propylene compressor is configured as two units, which are connected in parallel. The upper end of the suction buffer tank is connected to both propylene compressors, and the inlet end of the propylene subcooler is connected to the outlet end of both propylene compressors.

4. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 3, characterized in that: The pipe connecting the intake buffer tank and the propylene compressor is connected to an inert gas cooler. The inert gas cooler further cools the propylene in the non-condensable gas. The cooled liquid propylene returns to the propylene receiving tank, and the non-condensable gas is released to the propylene flare. An inert gas vent valve is installed on the pipe connecting the inert gas cooler and the propylene flare.

5. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 4, characterized in that: The propylene compressor is a two-stage compressor that produces gaseous propylene with a pressure of 1.72 MPaG-1.74 MPaG and a temperature of 82.7℃-93.15℃ after two-stage compression.

6. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 1, characterized in that: The throttle valve is located on the connecting pipeline between the propylene receiving tank and the propylene flash tank. The inlet end of the throttle valve is connected to the inlet of the inert gas cooler through the shell-side liquid level control valve, and the outlet end of the throttle valve is connected to the outlet end of the inert gas cooler through the tube-side regulating valve.

7. The method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 1, characterized in that: The propylene condenser is connected to a cooling water supply pipe and a cooling water return pipe. Water valves are installed on both the cooling water supply pipe and the cooling water return pipe. The outlet of the propylene condenser is connected to the inlet of the inert gas cooler.

8. A method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 7, characterized in that: The propylene condenser operates at a pressure of 1.59 MPaG-1.66 MPaG and a temperature of 40℃-42℃.

9. A method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 8, characterized in that: The liquid propylene in the propylene receiving tank is depressurized to 0.5MPaG-0.6MPaG by a throttle valve and then enters the propylene flash tank. The gaseous propylene flashed out of the propylene flash tank has a temperature of 0.8℃-1.21℃ and returns to the second stage of the propylene compressor.

10. A method for reducing liquid carryover at the inlet of a screw propylene compressor according to claim 9, characterized in that: In the propylene flash tank, a portion of the liquid propylene at a temperature of 0.8℃-1℃ bypasses through a three-way valve and enters the U-shaped heat exchange tube of the suction buffer tank to exchange heat with the liquid propylene inside the tank. After heat exchange, it merges with the main line of the three-way valve and enters the propylene subcooler. The temperature in the tube side is reduced to -10℃ to -11℃, and the pressure is 0.49MPaG-0.5MPaG. It then enters the acid gas removal unit in the propylene subcooler as a refrigerant for user use. The gaseous propylene that absorbs heat from the cryogenic cooler of the acid gas removal unit then enters the refrigeration unit for circulation.

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