Propylene compressor system

Abstract

The utility model relates to propylene compressor technical field, concretely relates to a propylene compressor system, including compressor body, inlet pneumatic gate valve, compressor inlet, outlet emptying valve, compressor outlet check valve and compressor outlet gate valve, compressor inlet is connected with compressor body, inlet pneumatic gate valve is connected with compressor inlet, compressor outlet check valve is connected with compressor body, compressor outlet gate valve is connected with compressor outlet check valve, outlet emptying valve is connected with compressor body and compresses just outlet check valve, and is located between compressor body and compressor outlet check valve, through above -mentioned structure's setting, solved the prior art opening compressor main pipeline inlet gate valve, and the compressor inlet pipeline instantaneously passes in a large amount of high pressure propylene gas, and this gas will cause the problem of bigger instantaneous impact to the compressor, and even damage compressor rotor.

Description

Technical Field

[0001] This utility model relates to the field of propylene compressor technology, and in particular to a propylene compressor system. Background Technology

[0002] Propylene compressors play a crucial role in industrial production. They are primarily used to compress propylene gas to the required pressure and are widely used in chemical, petroleum, and pharmaceutical industries. They are key equipment for gas compression and transportation in industrial production. Propylene leakage poses a significant danger to the environment. To reduce leakage in propylene compressor seals, especially under high outlet pressure conditions, tandem dry gas seals are generally selected.

[0003] While tandem dry gas seals can reduce shaft end seal leakage in propylene compressors to some extent, their structure results in a certain axial force on the rotating components. This axial force increases with the pressure in the compressor's sealing chamber (impeller back) and acts on the compressor rotor. During the initial compressor startup, due to the low impeller speed and poor impeller performance, the pressure at the impeller inlet and the compressor sealing chamber (impeller back) is essentially the same. Because the impeller back is connected to the high-speed shaft, its pressure-bearing area is lower than that at the impeller inlet. This results in a certain axial aerodynamic force acting on the compressor rotor, which increases with the compressor inlet pressure and its direction is axial. Since the axial force of the dry gas seal is in the same direction, during the initial startup of the compressor, the rotor is subjected to the combined force of the dry gas seal and the impeller aerodynamic force. The higher the compressor inlet pressure, the greater this combined force. This force is transmitted to the compressor rotor and is counteracted by the thrust bearing. During normal operation, a certain thickness of hydrodynamic oil film forms on the surface of the thrust bearing to prevent direct contact between the thrust bearing and the compressor rotor, which could lead to wear and damage. The higher the compressor speed, the thicker the hydrodynamic oil film, and the stronger its resistance to axial force. However, during the initial startup of the compressor, the rotor speed is low, and the hydrodynamic oil film formed by the bearing cannot withstand a large axial force. Therefore, to prevent the compressor bearing from experiencing a large axial force on the entire rotor during the initial startup, it is necessary to reduce the axial force on the entire rotor. In addition, if the compressor main pipeline inlet gate valve is opened before startup, a large amount of high-pressure propylene gas will be instantly introduced into the compressor inlet pipeline. This gas will cause a large instantaneous impact on the compressor, and may even damage the compressor rotor. Summary of the Invention

[0004] The purpose of this invention is to provide a propylene compressor system that solves the problem in the prior art where opening the inlet gate valve of the compressor main pipeline causes a large amount of high-pressure propylene gas to be instantly introduced into the compressor inlet pipeline, which can cause a large instantaneous impact on the compressor and even damage the compressor rotor.

[0005] To achieve the above objectives, this utility model provides a propylene compressor system, including a compressor body, an inlet pneumatic gate valve, a compressor inlet, an outlet vent valve, a compressor outlet check valve, and a compressor outlet gate valve. The compressor inlet is connected to the compressor body, the inlet pneumatic gate valve is connected to the compressor inlet, the compressor outlet check valve is connected to the compressor body, the compressor outlet gate valve is connected to the compressor outlet check valve, and the outlet vent valve is connected to the compressor body and the compressor outlet check valve, and is located between the compressor body and the compressor outlet check valve.

[0006] The propylene compressor system further includes an anti-surge aftercooler and an anti-surge valve. The anti-surge valve is connected to the compressor body and the outlet exhaust valve, and the anti-surge aftercooler is connected to the anti-surge valve and the compressor inlet.

[0007] The propylene compressor system further includes an air line valve and a nitrogen line valve, both of which are connected to the compressor inlet.

[0008] The propylene compressor system also includes a flow meter, which is connected to the compressor body and the compressor outlet check valve.

[0009] The propylene compressor system also includes an inlet pneumatic bypass regulating valve, which is connected to the compressor inlet.

[0010] This utility model discloses a propylene compressor system. The compressor inlet is connected to the compressor body. An inlet pneumatic gate valve is connected to the compressor inlet. A compressor outlet check valve is connected to the compressor body. The compressor outlet gate valve is connected to the compressor outlet check valve. An outlet vent valve is connected to the compressor body and the compressor outlet check valve, and is located between the compressor body and the compressor outlet check valve. The inlet pneumatic gate valve is a switch valve, designed to quickly disconnect the compressor inlet system connection to prevent system failure. The inlet pneumatic gate valve is a slow-opening, fast-closing type. The outlet vent valve, like the inlet pneumatic gate valve, is a switch valve, designed to quickly relieve compressor pipeline pressure. The outlet vent valve is a slow-closing, fast-opening type. The compressor outlet gate valve is a switch valve, designed to quickly disconnect the compressor body from the outlet system to prevent system failure. The compressor outlet gate valve is a slow-opening, fast-closing type. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the propylene compressor system of this utility model.

[0013] 1-Inlet pneumatic gate valve, 2-Air pipeline valve, 3-Nitrogen pipeline valve, 4-Compressor inlet IGV, 5-Compressor body, 6-Flow meter, 7-Outlet vent valve, 8-Compressor outlet check valve, 9-Compressor outlet gate valve, 10-Anti-surge valve, 11-Inlet pneumatic bypass regulating valve, 12-Anti-surge aftercooler. Detailed Implementation

[0014] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0015] Please see Figure 1 This utility model provides a propylene compressor system, including a compressor body 5, an inlet pneumatic gate valve 1, a compressor inlet 4, an outlet vent valve 7, a compressor outlet check valve 8, and a compressor outlet gate valve 9. The compressor inlet 4 is connected to the compressor body 5, the inlet pneumatic gate valve 1 is connected to the compressor inlet 4, the compressor outlet check valve 8 is connected to the compressor body 5, the compressor outlet gate valve 9 is connected to the compressor outlet check valve 8, and the outlet vent valve 7 is connected to the compressor body 5 and the compressor outlet check valve, and is located between the compressor body 5 and the compressor outlet check valve 8.

[0016] In this embodiment, the inlet pneumatic gate valve 1 is a switch valve. To prevent system failure, it quickly disconnects the compressor inlet 4 system connection. The inlet pneumatic gate valve 1 is a slow-opening and fast-closing type. The outlet vent valve 7 is the same as the inlet pneumatic gate valve 1, and is a switch valve. To quickly relieve the compressor pipeline pressure, the outlet vent valve 7 is a slow-closing and fast-opening type. The compressor outlet gate valve 9 is a switch valve. To prevent system failure, it quickly disconnects the compressor body 5 from the outlet system connection. The compressor outlet gate valve 9 is a slow-opening and fast-closing type.

[0017] Furthermore, the propylene compressor system also includes an anti-surge aftercooler 12 and an anti-surge valve 10. The anti-surge valve 10 is connected to the compressor body 5 and the outlet exhaust valve, and the anti-surge aftercooler 12 is connected to the anti-surge valve 10 and the compressor inlet 4.

[0018] In this embodiment, the anti-surge valve 10 is a regulating valve, which is fast-opening and slow-closing. The anti-surge aftercooler 12 is mainly a cooler installed to prevent the temperature of propylene gas from continuously rising due to the backflow of gas from the user's compressor.

[0019] Furthermore, the propylene compressor system also includes an air line valve 2 and a nitrogen line valve 3, both of which are connected to the compressor inlet 4.

[0020] In this embodiment, both the air pipeline valve 2 and the nitrogen pipeline valve 3 are manually operated gate valves.

[0021] Furthermore, the propylene compressor system also includes a flow meter 6, which is connected to the compressor body 5 and the compressor outlet check valve 8.

[0022] In this embodiment, the flow meter 6 is used to detect the flow rate of gas compressed by the compressor body 5.

[0023] Furthermore, the propylene compressor system also includes an inlet pneumatic bypass regulating valve 11, which is connected to the compressor inlet 4.

[0024] In this embodiment, the inlet pneumatic bypass regulating valve 11 is a pneumatic regulating valve, which is a slow-opening and fast-closing type.

[0025] When using this invention, keep the inlet pneumatic gate valve 1 and the inlet pneumatic bypass regulating valve 11 closed, the compressor outlet gate valve 9 closed, the anti-surge valve 10 open, the compressor inlet 4 guide vanes fully open, and the outlet vent valve 7 fully open. Simultaneously, open the air pipeline valve 2 to purge the compressor pipeline with air. After purging, close all system valves, remove the compressor inlet temporary filter (if not removed, the compressor inlet 4 will suffer significant damage), and reconnect the restoration pipeline. Since propylene gas mixed with air in a certain proportion is prone to explosion, it is necessary to use inert nitrogen to purge the air from the compressor pipeline. Keep the compressor inlet 4 guide vanes fully open, open the outlet vent valve 7, close the air pipeline valve 2, then open the nitrogen pipeline valve 3. Keep the inlet pneumatic gate valve 1 and the inlet pneumatic bypass regulating valve 11 closed, and introduce low-pressure nitrogen (pressure slightly higher than the local atmospheric pressure). After purging for a period of time, open the anti-surge valve 10 to continue purging. Then, collect the exhausted gas at the outlet of the outlet vent valve 7. When the gas is detected and the discharged gas is all nitrogen, the nitrogen pipeline valve 3 is closed and the inlet pneumatic bypass regulating valve 11 is opened. At the same time, the outlet flare of the outlet vent valve 7 is ignited, and high-pressure propylene gas is introduced from the compressor inlet 4. At this time, the nitrogen is gradually displaced. After the nitrogen is completely displaced, the outlet vent valve 7 is closed, and the pressure of the compressor pipeline gradually increases (if the pressure of the compressor pipeline increases too quickly, the inlet bypass regulating valve can be closed to a certain degree). After the compressor pipeline pressure is higher than the system flare back pressure, the inlet bypass regulating valve is closed. At this point, because the compressor network pressure is low and the gas inside is propylene, the compressor inlet 4 guide vane is opened to a certain degree (this degree is calculated and simulated to ensure that the compressor will not operate with overcurrent or surge when the motor reaches its rated speed). The main motor is started, and after the compressor body 5 reaches its rated speed, the inlet pneumatic bypass regulating valve 11 is opened to a certain degree. The compressor network pressure gradually increases until it matches the high-pressure propylene gas pressure before the inlet pneumatic gate valve 1. Then, the compressor outlet gate valve 9 is opened, and the anti-surge valve 10 is gradually closed. The compressor outlet pressure slowly increases, and when it exceeds the pressure after the compressor outlet check valve 8, the compressor outlet propylene gas is incorporated into the outlet main network. The anti-surge valve 10 is then gradually closed until it is fully closed. The compressor body 5 then completes its startup and enters normal operation.

[0026] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A propylene compressor system, characterized in that, The system includes a compressor body, an inlet pneumatic gate valve, a compressor inlet, an outlet vent valve, a compressor outlet check valve, and a compressor outlet gate valve. The compressor inlet is connected to the compressor body, the inlet pneumatic gate valve is connected to the compressor inlet, the compressor outlet check valve is connected to the compressor body, the compressor outlet gate valve is connected to the compressor outlet check valve, and the outlet vent valve is connected to the compressor body and the compressor outlet check valve, and is located between the compressor body and the compressor outlet check valve.

2. The propylene compressor system as described in claim 1, characterized in that, The propylene compressor system also includes an anti-surge aftercooler and an anti-surge valve. The anti-surge valve is connected to the compressor body and the outlet exhaust valve, and the anti-surge aftercooler is connected to the anti-surge valve and the compressor inlet.

3. The propylene compressor system as described in claim 2, characterized in that, The propylene compressor system also includes an air line valve and a nitrogen line valve, both of which are connected to the compressor inlet.

4. The propylene compressor system as described in claim 3, characterized in that, The propylene compressor system also includes a flow meter connected to the compressor body and the compressor outlet check valve.

5. The propylene compressor system as described in claim 4, characterized in that, The propylene compressor system also includes an inlet pneumatic bypass regulating valve, which is connected to the compressor inlet.

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