Dry gas seal gas supply system of propylene compressor

Abstract

The utility model discloses a propylene compressor dry gas seal gas supply system which comprises a propylene intermediate tank, a propylene gas conveying pipe is arranged on the propylene intermediate tank, a first valve is arranged on the propylene gas conveying pipe, and the propylene gas conveying pipe is connected with a first-stage seal gas conveying pipeline of a propylene compressor. The first-stage sealing gas conveying pipeline is used for conveying flashed propylene gas in the propylene intermediate tank into a propylene compressor to serve as a first-stage sealing gas source, and a second valve is arranged on the first-stage sealing gas conveying pipeline; the propylene heater is used for heating propylene liquid led out from the propylene intermediate tank, so that the temperature and the pressure intensity of propylene fed into the propylene intermediate tank after heating are kept constant, a liquid inlet of the propylene heater is connected with the bottom of the propylene intermediate tank through a pipeline, and a liquid outlet of the propylene heater is connected with the upper part of the propylene intermediate tank through a pipeline. The problem that when nitrogen serves as a first-stage sealing gas source, the nitrogen enters a process system through a propylene compressor cylinder body, and consequently the propylene consumption is large in the driving period of a propylene compressor unit is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical equipment, in particular to a propylene compressor dry gas sealing gas supply system. Background Art

[0002] The purification equipment of Pucheng Clean Energy Chemical Co., Ltd. is built in two series. The purification equipment adopts the low-temperature methanol washing process technology of German Linde, and the supporting propylene compressor system of the refrigeration station provides cooling capacity to the purification system to meet the cooling capacity loss required for the operation of the purification system; the refrigeration station uses a steam turbine to drive the propylene compressor, and uses propylene as the medium. Through compression, water condensation, throttling and pressure reduction evaporation, the refrigeration effect is achieved, and cooling capacity is provided to each propylene cooler in the low-temperature methanol washing device.

[0003] The refrigeration design capacity of the propylene compressor in the refrigeration station is engineered according to the -38°C cooling capacity (4760kW) required by a single-series low-temperature methanol washing device. It is divided into two series in total, and each series corresponds to and is connected to a low-temperature methanol washing device one by one; the outlet of the propylene compressor is connected to a propylene cooler and a propylene condenser, which is used to compress the propylene gas recovered from the low-temperature methanol washing system in the propylene compressor, and condense it through the propylene cooler and propylene condenser and recover it into the propylene intermediate tank. The recovered propylene enters the propylene cryogenic cooler through the propylene intermediate tank for cooling, and is then sent to each propylene cryogenic cooler of the low-temperature methanol washing device again to provide cooling capacity for the low-temperature methanol washing device.

[0004] In order to prevent the gas inside the compressor from leaking into the external environment and ensure the normal operation and efficient work of the compressor, during the operation of the propylene compressor, the propylene compressor uses the propylene gas at the outlet of the propylene compressor to be sent into the propylene compressor through the first-level sealing gas pipeline as the first-level sealing gas source, and the propylene compressor uses 0.8MPa nitrogen as the first-level sealing gas source during startup and shutdown; however, when the propylene compressor is started, when 0.8MPa nitrogen is used as the first-level sealing gas source, nitrogen will enter the process system through the propylene compressor cylinder, causing the outlet pressure and temperature of the propylene compressor to continue to rise, and a large amount of propylene gas needs to be discharged to carry out the non-condensable gas in the system to reduce the outlet pressure and temperature of the propylene compressor, resulting in a large amount of propylene consumption during the startup of the propylene compressor unit. Utility Model Content

[0005] The purpose of the utility model is to overcome the problem in the prior art that when nitrogen is used as the primary sealing gas source, nitrogen enters the process system through the propylene compressor cylinder, causing the propylene compressor outlet pressure and temperature to continue to rise, resulting in the need to discharge a large amount of propylene gas to carry out the system non-condensable gas, thereby causing a large amount of propylene consumption during the start-up of the propylene compressor unit, and thus providing a propylene compressor dry gas sealing air supply system.

[0006] The utility model provides a propylene compressor dry gas sealing gas supply system, comprising a propylene intermediate tank, a propylene gas delivery pipe provided on the propylene intermediate tank, a first valve provided on the propylene gas delivery pipe, the propylene gas delivery pipe being connected to a primary sealing gas delivery pipeline of the propylene compressor and used for delivering propylene gas flashed in the propylene intermediate tank into the propylene compressor as a primary sealing gas source, a second valve provided on the primary sealing gas delivery pipeline; and further comprising:

[0007] The propylene heater is used to heat the propylene liquid drawn out of the propylene intermediate tank so that the temperature and pressure of the propylene sent to the propylene intermediate tank after heating are kept constant. Its liquid inlet is connected to the bottom of the propylene intermediate tank through a pipeline, and its liquid outlet is connected to the upper part of the propylene intermediate tank through a pipeline.

[0008] Preferably, the propylene intermediate tank is provided with a pressure detector, the propylene heater includes a steam delivery pipe, the steam delivery pipe is provided with a first pneumatic regulating valve, the first pneumatic regulating valve and the pressure detector are both electrically connected to a power supply, and the first pneumatic regulating valve and the pressure detector are both connected to a central control room, for detecting the propylene gas pressure in the propylene intermediate tank by the pressure detector and feeding it back to the control room, which regulates the opening of the first pneumatic regulating valve to ensure constant temperature and pressure in the propylene intermediate tank.

[0009] Preferably, the two pipelines connecting the propylene heater and the propylene intermediate tank constitute a siphon delivery pipeline.

[0010] Preferably, a second pneumatic regulating valve is further provided on the primary sealing gas transmission pipeline.

[0011] Preferably, the propylene compressor is connected to a propylene gas pipeline, one end of the propylene gas pipeline is connected to the primary sealing gas pipeline, and the other end of the propylene gas pipeline is connected to the propylene compressor.

[0012] Preferably, it further comprises a propylene cooler and a propylene condenser, the propylene gas pipeline is connected to the gas inlet of the propylene cooler, the gas outlet of the propylene cooler is connected to the liquid inlet of the propylene condenser via a pipeline, and the liquid outlet of the propylene condenser is connected to the propylene intermediate tank via a pipeline.

[0013] Preferably, a third valve is provided on the pipeline connecting the propylene heater and the bottom of the propylene intermediate tank, a fourth valve is provided on the pipeline connecting the propylene heater and the upper part of the propylene intermediate tank, and a fifth valve is provided on the pipeline connecting the liquid outlet of the propylene condenser and the propylene intermediate tank.

[0014] Preferably, the propylene compressor is connected to a propylene gas delivery pipe, the propylene gas delivery pipe is connected to a first gas storage tank, and the first gas storage tank is connected to a low-temperature methanol washing system.

[0015] Preferably, the first gas storage tank is connected to the pipeline connected to the gas outlet of the propylene cooler through a pipeline, a third pneumatic valve is provided on the pipeline between the first gas storage tank and the propylene cooler, the propylene compressor is also connected to the second gas storage tank through a pipeline, the second gas storage tank is connected to the pipeline connected to the gas outlet of the propylene cooler through a pipeline, and a fourth pneumatic valve is provided on the pipeline between the second gas storage tank and the propylene cooler.

[0016] Preferably, the pipeline between the liquid inlet of the propylene heater and the bottom of the propylene intermediate tank, the pipeline between the liquid outlet of the propylene heater and the upper part of the propylene intermediate tank, and the propylene gas delivery pipe are all made of carbon steel.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The utility model can ensure the normal operation of the propylene compressor unit of the existing refrigeration station.

[0019] 2. After the application of the utility model, when the propylene compressor unit of the refrigeration station is started, zero propylene emission can be achieved during the start-up process of the propylene compressor unit, and the propylene consumption is significantly reduced.

[0020] 3. After the application of the utility model, when the refrigeration station compressor unit is started, the non-condensable gas volume of the propylene compressor unit system can be reduced, thereby avoiding high compressor outlet pressure during the start-up of the propylene compressor unit and ensuring the safe operation process of the propylene compressor unit.

[0021] 4. After the application of this utility model, a new idea is provided for the first-level sealing gas supply of the dry gas seal of the propylene compressor unit; it can effectively prevent non-condensable gas from entering the propylene compressor system, reduce the steam consumption and other energy consumption of the unit, and reduce the operating cost of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the actual production process flow chart of the prior art.

[0023] Figure 2 This is the actual production process flow chart of this utility model

[0024] Description of reference numerals:

[0025] 1. Propylene intermediate tank, 2. Propylene gas transmission pipe, 3. Propylene compressor, 4. Propylene heater, 5. Primary sealing gas transmission pipeline, 6. Propylene gas transmission pipe, 7. Propylene cooler, 8. Propylene condenser, 9. First gas storage tank, 10. Second gas storage tank. DETAILED DESCRIPTION

[0026] The following is combined with Figure 2, the specific embodiments of the present invention are described in detail, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] like Figure 2 As shown, the utility model provides a propylene compressor dry gas sealing gas supply system, including a propylene intermediate tank 1, a propylene gas delivery pipe 2 is provided on the propylene intermediate tank 1, a first valve is provided on the propylene gas delivery pipe 2, the propylene gas delivery pipe 2 is connected to the primary sealing gas delivery pipeline 5 of the propylene compressor 3, and is used to deliver the flashed propylene gas in the propylene intermediate tank 1 to the propylene compressor 3 as a primary sealing gas source, and a second valve is provided on the primary sealing gas delivery pipeline 5; and further comprising:

[0028] The propylene heater 4 is used to heat the propylene liquid drawn out of the propylene intermediate tank 1 so that the temperature and pressure of the propylene sent to the propylene intermediate tank 1 after heating are kept constant. Its liquid inlet is connected to the bottom of the propylene intermediate tank 1 through a pipeline, and its liquid outlet is connected to the upper part of the propylene intermediate tank 1 through a pipeline.

[0029] Specifically, a pressure detector is provided on the propylene intermediate tank 1, and the propylene heater 4 includes a steam delivery pipe. A first pneumatic regulating valve is provided on the steam delivery pipe. The first pneumatic regulating valve and the pressure detector are both electrically connected to a power supply. The first pneumatic regulating valve and the pressure detector are both connected to a central control room, and are used to detect the propylene gas pressure in the propylene intermediate tank 1 through the pressure detector and feed it back to the control room. The control room adjusts the opening of the first pneumatic regulating valve to ensure that the temperature and pressure in the propylene intermediate tank 1 are constant.

[0030] Specifically, the two pipelines connecting propylene heater 4 and propylene intermediate tank 1 form a siphon delivery line. This utilizes the different densities of propylene at different temperatures: the higher the temperature of liquid propylene, the lower its density. At this point, the hotter liquid propylene is above propylene intermediate tank 1. Connecting the siphon line between propylene heater 4 and propylene intermediate tank 1 allows the low-density liquid propylene to continuously enter the propylene heater for heating, effectively ensuring the vaporization of the liquid propylene.

[0031] Specifically, a second pneumatic regulating valve is also provided on the first-level sealing gas transmission pipeline 5. The purpose of setting the second pneumatic regulating valve is: to adjust the first-level sealing gas pressure to be higher than the gas pressure in the first-level sealing cavity of the high and low pressure cylinders of the propylene compressor 3 through the second pneumatic regulating valve, thereby reducing the gas unloading amount in the cylinder body of the propylene compressor 3; at the same time, to ensure that the leakage pressure of the first-level sealing gas is higher than the flare pipeline pressure, and to ensure that the leakage gas of the first-level sealing gas is normally discharged to the flare system.

[0032] Specifically, a propylene gas pipe 6 is connected to the propylene compressor 3, one end of which is connected to the primary sealing gas pipeline 5, and the other end of the propylene gas pipe 6 is connected to the propylene compressor 3. The propylene gas from the low-temperature methanol wash is compressed by the propylene compressor 3 and sent out again into the propylene gas pipe 6. When the propylene compressor is running, it is necessary to open the valve on the primary sealing gas pipeline 5 connected to the propylene gas pipe 6, so that the propylene gas output from the propylene gas pipe 6 is sent into the propylene compressor 3 through the primary sealing gas pipeline 5 as the primary sealing gas source. At this time, most of the compressed propylene transported by the propylene gas pipe 6 is output by the propylene gas pipe 6.

[0033] Specifically, in order to liquefy the propylene gas output from the propylene gas pipeline 6 for easy storage, a propylene cooler 7 and a propylene condenser 8 are connected to the propylene gas pipeline 6. The propylene gas pipeline 6 is connected to the gas inlet of the propylene cooler 7, the gas outlet of the propylene cooler 7 is connected to the liquid inlet of the propylene condenser 8 via a pipeline, and the liquid outlet of the propylene condenser 8 is connected to the propylene intermediate tank 1 via a pipeline.

[0034] Specifically, a third valve is provided on the pipeline connecting the propylene heater 4 and the bottom of the propylene intermediate tank 1, a fourth valve is provided on the pipeline connecting the propylene heater 4 and the upper part of the propylene intermediate tank 1, and a fifth valve is provided on the pipeline between the liquid outlet of the propylene condenser 8 and the propylene intermediate tank 1. By setting the valves, the pipeline can be adjusted in real time to connect to the propylene compressor dry gas seal supply system.

[0035] Specifically, the propylene compressor 3 is connected to the gaseous propylene delivery pipe, the gaseous propylene delivery pipe is connected to the first gas storage tank 9, and the first gas storage tank 9 is connected to the low-temperature methanol washing system for storing the gaseous propylene output by the low-temperature methanol washing system.

[0036] Specifically, the first gas storage tank 9 is connected to the pipeline connected to the gas outlet of the propylene cooler 7 through a pipeline, and a third pneumatic valve is provided on the pipeline between the first gas storage tank 9 and the propylene cooler 7. The propylene compressor 3 is also connected to the second gas storage tank 10 through a pipeline, which is used for anti-surge adjustment of the propylene compressor 3. The second gas storage tank 10 is connected to the pipeline connected to the gas outlet of the propylene cooler 7 through a pipeline, and a fourth pneumatic valve is provided on the pipeline between the second gas storage tank 10 and the propylene cooler 7, wherein the third pneumatic valve and the fourth pneumatic valve are anti-surge valves. The purpose of providing the third pneumatic valve on the pipeline between the first gas storage tank 9 and the propylene cooler 7 and the fourth pneumatic valve on the pipeline between the second gas storage tank 10 and the propylene cooler 7 is to reasonably regulate the air intake at the inlet of the propylene compressor 3, avoid low air volume at the inlet of the propylene compressor 3, and thereby reduce the probability of surge of the propylene compressor 3.

[0037] Specifically, the pipeline between the liquid inlet of the propylene heater 4 and the bottom of the propylene intermediate tank 1, the pipeline between the liquid outlet of the propylene heater 4 and the upper part of the propylene intermediate tank 1, and the propylene gas delivery pipe 2 are all made of carbon steel. Such material is selected considering corrosion resistance.

[0038] In order to prevent the gas inside the compressor from leaking to the external environment and ensure the normal operation and efficient operation of the compressor, the existing technology often adopts the following methods: Figure 1 The propylene compressor dry gas seal supply system is used to seal the compressor gas source. The specific sealing steps are as follows:

[0039] Typically, the propylene gas from the low-temperature methanol wash is pipelined into a first gas storage tank 9 for storage. This first gas storage tank 9 is connected to the propylene compressor 3 via a pipeline. Therefore, the propylene gas from the first gas storage tank 9 is compressed and then delivered through a propylene gas pipeline 6, which is connected to a primary sealing gas pipeline 5. When the propylene compressor 3 is operating, the valve on the primary sealing gas pipeline 5 is opened, and the propylene gas in the propylene gas pipeline 6 is re-delivered to the propylene compressor 3 via the primary sealing gas pipeline 5 as the primary sealing gas source. The vast majority of the propylene gas in the propylene gas pipeline 6 undergoes heat exchange in a propylene cooler 7 and a propylene condenser 8 to produce liquid propylene, which is stored in the propylene intermediate tank 1 for recovery.

[0040] When the propylene compressor is started or stopped, the propylene compressor 3 does not work normally. At this time, it is necessary to use a nitrogen delivery pipe connected to the primary sealing gas pipeline 5 to seal the propylene compressor 3. The 0.8 MPa nitrogen delivered in the nitrogen delivery pipe is used as the primary sealing gas source to seal the propylene compressor 3.

[0041] However, during the startup of propylene compressor 3, when 0.8MPa nitrogen is used as the primary sealing gas source, nitrogen will enter the propylene compressor dry gas sealing gas supply system through the cylinder body of propylene compressor 3, causing the outlet pressure and temperature of propylene compressor 3 to continue to rise. Therefore, a large amount of propylene gas needs to be discharged to bring out the non-condensable gas of the system. The non-condensable gas needs to be sent to the venting air to remove heavy hydrocarbons flare pipeline for combustion and discharge, resulting in a large amount of propylene consumption during the startup of the propylene compressor unit.

[0042] In order to solve the problems existing in the above-mentioned prior art, the present invention Figure 1 The system given in the technical transformation is carried out. After the technical transformation, the problem of the existing propylene compressor dry gas seal supply system requiring a large amount of propylene gas to be discharged and the non-condensable gas in the system is overcome.

[0043] like Figure 2As shown, the propylene gas from the low-temperature methanol wash is typically piped into a first gas storage tank 9 for storage. The first gas storage tank 9 is connected to the propylene compressor 3 via a pipeline. Therefore, the propylene gas from the first gas storage tank 9, piped into the propylene compressor 3 via the pipeline, is compressed and then delivered through a propylene gas pipeline 6. This propylene gas pipeline 6 is connected to a primary sealing gas pipeline 5. When the propylene compressor 3 is operating, the valve on the primary sealing gas pipeline 5 is opened, and the propylene gas in the propylene gas pipeline 6 is re-delivered to the propylene compressor 3 via the primary sealing gas pipeline 5 as the primary sealing gas source. The vast majority of the propylene gas in the propylene gas pipeline 6 undergoes heat exchange in a propylene cooler 7 and a propylene condenser 8 to generate propylene liquid, which is then stored in a propylene intermediate tank 1 for recovery.

[0044] In order to avoid the problem that when 0.8MPa nitrogen is used as the first-level sealing gas source, nitrogen will enter the propylene compressor dry gas sealing air supply system through the propylene compressor 3 cylinder body, and a large amount of propylene gas needs to be discharged.

[0045] The utility model needs to supply gas to the primary sealing gas transmission pipeline 5 through the gas phase at the top of the propylene intermediate tank 1 .

[0046] The specific operations are:

[0047] When the propylene compressor 3 is operating normally, the working pressure of the propylene intermediate tank 1 is 1.73MPa; during the start-up of the propylene compressor 3, the temperature in the propylene intermediate tank 1 is 30°C. At this time, the pressure in the propylene intermediate tank 1 is the saturated vapor pressure of propylene at the current temperature. When the propylene compressor 3 is supplied with the first-level sealing gas through the propylene intermediate tank 1, the propylene gas in the propylene intermediate tank 1 continuously flows out to supply the first-level sealing gas pipeline 5. This is because during the start-up of the propylene compressor 3, the temperature in the propylene intermediate tank 1 is basically room temperature. At this time, the pressure in the propylene intermediate tank 1 is the saturated vapor pressure of propylene at the current temperature. When the propylene intermediate tank 1 supplies the first-level sealing gas to the propylene compressor 3, the propylene gas in the propylene intermediate tank 1 continuously flows out to supply the first-level sealing gas pipeline 5. The pressure in the intermediate tank 1 decreases, and the liquid propylene in the intermediate tank will continue to evaporate; the liquid propylene continues to vaporize, causing the temperature of the liquid propylene in the intermediate tank 1 to continue to decrease. When the temperature of the liquid propylene in the intermediate tank is lower than 11°C, the pressure in the intermediate tank is lower than 0.8MPa. At this time, the liquid propylene in the intermediate tank needs to be heated by the propylene heater 4 to maintain the temperature of the liquid propylene in the intermediate tank 1. This can ensure that the pressure in the intermediate tank 1 is 0.8MPa at this temperature. The pressure indicator at the top of the intermediate tank 1 controls the amount of heating steam from the propylene heater. When the pressure is higher than 0.8MPa, the heating steam valve is closed, and the propylene gas that continuously evaporates after heating is supplied to the first-level sealing gas of the dry gas seal.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A propylene compressor dry gas sealing gas supply system, comprising a propylene intermediate tank (1), characterized in that: The propylene intermediate tank (1) is provided with a propylene gas delivery pipe (2), the propylene gas delivery pipe (2) is provided with a first valve, the propylene gas delivery pipe (2) is connected to the primary sealing gas delivery pipeline (5) of the propylene compressor (3), and is used to deliver the flashed propylene gas in the propylene intermediate tank (1) into the propylene compressor (3) as a primary sealing gas source, and the primary sealing gas delivery pipeline (5) is provided with a second valve; and further comprising: The propylene heater (4) is used to heat the propylene liquid drawn out from the propylene intermediate tank (1) so that the temperature and pressure of the propylene sent to the propylene intermediate tank (1) after heating are kept constant. The liquid inlet of the heater is connected to the bottom of the propylene intermediate tank (1) through a pipeline, and the liquid outlet of the heater is connected to the upper part of the propylene intermediate tank (1) through a pipeline.

2. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The propylene intermediate tank (1) is provided with a pressure detector, the propylene heater (4) includes a steam delivery pipe, the steam delivery pipe is provided with a first pneumatic regulating valve, the first pneumatic regulating valve and the pressure detector are both electrically connected to a power supply, the first pneumatic regulating valve and the pressure detector are both connected to a central control room, and are used to detect the propylene gas pressure in the propylene intermediate tank (1) through the pressure detector and feed it back to the control room, and the control room regulates the opening of the first pneumatic regulating valve to ensure that the temperature and pressure in the propylene intermediate tank (1) are constant.

3. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The two pipelines connected between the propylene heater (4) and the propylene intermediate tank (1) constitute a siphon delivery pipeline.

4. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The first-level sealing gas transmission pipeline (5) is also provided with a second pneumatic regulating valve.

5. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The propylene compressor (3) is connected to a propylene gas pipeline (6), one end of the propylene gas pipeline (6) is in communication with a primary sealing gas pipeline (5), and the other end of the propylene gas pipeline (6) is connected to the propylene compressor (3).

6. A propylene compressor dry gas seal supply system according to claim 5, characterized in that: The invention also includes a propylene cooler (7) and a propylene condenser (8), wherein the propylene gas pipeline (6) is connected to the gas inlet of the propylene cooler (7), the gas outlet of the propylene cooler (7) is connected to the liquid inlet of the propylene condenser (8) through a pipeline, and the liquid outlet of the propylene condenser (8) is connected to the propylene intermediate tank (1) through a pipeline.

7. A propylene compressor dry gas seal supply system according to claim 6, characterized in that: A third valve is provided on the pipeline connecting the propylene heater (4) and the bottom of the propylene intermediate tank (1), a fourth valve is provided on the pipeline connecting the propylene heater (4) and the upper part of the propylene intermediate tank (1), and a fifth valve is provided on the pipeline connecting the liquid outlet of the propylene condenser (8) and the propylene intermediate tank (1).

8. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The propylene compressor (3) is connected to a propylene gas delivery pipe, the propylene gas delivery pipe is connected to a first gas storage tank (9), and the first gas storage tank (9) is connected to a low-temperature methanol washing system.

9. A propylene compressor dry gas seal supply system according to claim 8, characterized in that: The first gas storage tank (9) is connected to a pipeline connected to the gas outlet of the propylene cooler (7) through a pipeline, and a third pneumatic valve is provided on the pipeline between the first gas storage tank (9) and the propylene cooler (7). The propylene compressor (3) is also connected to a second gas storage tank (10) through a pipeline, and the second gas storage tank (10) is connected to a pipeline connected to the gas outlet of the propylene cooler (7) through a pipeline, and a fourth pneumatic valve is provided on the pipeline between the second gas storage tank (10) and the propylene cooler (7).

10. A propylene compressor dry gas seal supply system according to claim 1, characterized in that: The pipeline between the liquid inlet of the propylene heater (4) and the bottom of the propylene intermediate tank (1), the pipeline between the liquid outlet of the propylene heater (4) and the upper part of the propylene intermediate tank (1), and the propylene gas delivery pipe (2) are all made of carbon steel.

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