Prying design reciprocating compressor unit emptying system

Abstract

The invention relates to the technical field of reciprocating compressor units, in particular to a prying design reciprocating compressor unit emptying system which comprises a main air inlet pipeline, an emptying system body is arranged on the main air inlet pipeline, and the emptying system body comprises an inlet pipeline, a multi-stage exhaust pipeline, an automatic emptying pipeline and an emptying gathering pipeline. The emptying gathering pipeline and the main air inlet pipeline are arranged side by side, the inlet pipeline, the multi-stage exhaust pipeline and the automatic emptying pipeline are sequentially arranged between the main air inlet pipeline and the emptying gathering pipeline, an inlet safety valve is arranged on the inlet pipeline, an automatic emptying valve is arranged on the automatic emptying pipeline, and a liquid collecting device is arranged on the emptying gathering pipeline. The compressor unit body is protected against overpressure through the arranged emptying system body, liquid separated out in the emptying gathering pipeline during emptying is collected through the arranged liquid collecting tank, purging, replacing and discharging of the liquid are achieved in the mode that gas is introduced into the liquid collecting tank, and gathering of the liquid in the emptying gathering pipeline is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating compressor units, and in particular to a skid-designed reciprocating compressor unit venting system. Background Art

[0002] As a key equipment for gas boosting, reciprocating compressor units are machines that increase gas pressure by compressing gas. They are widely used in the natural gas industry and are mainly used in test gas recovery, wellhead gas collection and processing, gas lift gas and oil production, boosted transportation and other fields. During the use of reciprocating compressor units, in order to ensure the safety of the unit, it is usually necessary to regularly vent the inside of the unit. The venting system is integrated and installed in the skid of the reciprocating compressor unit to protect the unit from overpressure. At the same time, it ensures that the unit can be shut down quickly and safely during the shutdown process of the unit. The venting system connects the unit with the combustion torch outside the skid through the venting pipeline. The venting system of the prior art When installed in the skid, in order to reduce the impact of air flow pulsation of the reciprocating compressor unit on the operation of the unit, the components of the venting system are arranged with a low center of gravity, especially the venting aggregation pipeline is the lowest arranged pipeline in the entire venting system. However, since the venting aggregation pipeline needs to be connected to the station flare system outside the skid, the pipelines of the flare system outside the skid are mostly arranged in a pipe gallery with an overall higher position. Therefore, there is a low-point U-bend at the venting aggregation pipeline of the unit. Since venting is a pressure relief process, liquid precipitation is likely to occur in the venting aggregation pipeline during the venting process. If the liquid enters the unit or accumulates in the venting aggregation pipeline, there is a great risk of corrosion, affecting the normal and safe operation of the unit.

[0003] Therefore, it is necessary to propose a skid-designed reciprocating compressor unit venting system to overcome the defects of the prior art. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a reciprocating compressor unit venting system with a skid-type design.

[0005] The technical solution of the present invention is: A skid-type reciprocating compressor unit venting system comprises a main air intake pipeline, a compressor unit body is arranged on the main air intake pipeline, a venting system body is arranged on the main air intake pipeline, the venting system body comprises an inlet pipeline, a multi-stage exhaust pipeline, an automatic venting pipeline and a venting aggregation pipeline, the venting aggregation pipeline is arranged side by side with the main air intake pipeline, the inlet pipeline, the multi-stage exhaust pipeline and the automatic venting pipeline are arranged in sequence between the main air intake pipeline and the venting aggregation pipeline, the inlet pipeline is provided with an inlet safety valve, the automatic venting pipeline is provided with an automatic venting valve, and a liquid collecting device is provided at the end of the venting aggregation pipeline.

[0006] Preferably, the liquid collecting device includes a liquid collecting tank, a displacement pipeline and a drainage pipeline. The liquid collecting tank is connected to the venting and collecting pipeline through the liquid collecting pipeline. The displacement pipeline and the drainage pipeline are both connected to the liquid collecting tank. A liquid collecting cut-off valve is provided on the liquid collecting pipeline, a displacement gas cut-off valve is provided on the displacement pipeline, and a drainage cut-off valve is provided on the drainage pipeline.

[0007] Preferably, a liquid level window and a liquid level switch are provided on the liquid collecting tank. The liquid level window is used to observe the liquid level height in the liquid collecting tank, and the liquid level switch is used to achieve high liquid level shutdown protection in the liquid collecting tank.

[0008] Preferably, the compressor unit body comprises a primary compression cylinder, a primary cooler, a secondary compression cylinder and a secondary cooler which are sequentially connected in series.

[0009] Preferably, the inlet pipeline is connected to the total air intake pipeline before the first-stage compression cylinder, the automatic vent pipeline is connected to the total air intake pipeline after the second-stage cooler, the multi-stage exhaust pipeline includes a first-stage exhaust pipeline and a second-stage exhaust pipeline, the inlet end of the first-stage exhaust pipeline is connected to the total air intake pipeline between the first-stage compression cylinder and the first-stage cooler, the outlet end of the first-stage exhaust pipeline is connected to the vent collecting pipeline, a first-stage exhaust safety valve is provided on the first-stage exhaust pipeline, the inlet end of the second-stage exhaust pipeline is connected to the total air intake pipeline between the second-stage compression cylinder and the second-stage cooler, the outlet end of the second-stage exhaust pipeline is connected to the vent collecting pipeline, and a second-stage exhaust safety valve is provided on the second-stage exhaust pipeline.

[0010] Preferably, the venting system body also includes a manual venting pipeline, which is arranged in parallel with the automatic venting pipeline, and a manual venting valve is arranged on the manual venting pipeline.

[0011] Preferably, the automatic drain valve adopts a single-acting automatic control ball valve.

[0012] Preferably, the manual vent valve and the automatic vent valve have the same caliber.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The venting system body is set up to protect the compressor body from overpressure, thereby improving the safety of the system. The inlet safety valve protects the venting system body from the impact of upstream high-pressure gas. The first-level exhaust safety valve and the second-level exhaust safety valve protect the compressor body from internal overpressure. The automatic venting valve and the manual venting valve realize automatic and manual pressure relief when shutting down. 2. The liquid collecting tank is installed downstream of the venting and collecting pipeline to collect the condensed liquid precipitated in the venting and collecting pipeline to prevent the liquid from gathering in the venting and collecting pipeline, and to purge, replace and discharge the liquid in the liquid collecting tank by introducing gas into the liquid collecting tank; 3. The overall design of the upstream in the skid is coordinated to realize the selection of the safety valve, the low center of gravity layout of the venting and collecting pipeline in the skid, the liquid collection design of the venting and collecting pipeline, the liquid collection and discharge control of the liquid collecting tank, etc. The method is novel, the venting effect is significant, and it has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the liquid collecting device of the present invention.

[0015] Among them, 1. main air intake pipeline; 2. inlet pipeline; 3. inlet safety valve; 4. primary exhaust pipeline; 5. primary exhaust safety valve; 6. secondary exhaust pipeline; 7. secondary exhaust safety valve; 8. automatic venting pipeline; 9. automatic venting valve; 10. manual venting pipeline; 11. manual venting valve; 12. venting summary pipeline; 13. liquid collecting device; 131. liquid collecting tank; 132. displacement pipeline; 133. displacement gas shut-off valve; 134. drain pipeline; 135. drain shut-off valve; 136. liquid collecting pipeline; 137. liquid collecting shut-off valve; 138. liquid level window; 139. liquid level switch; 14. primary compression cylinder; 15. primary cooler; 16. secondary compression cylinder; 17. secondary cooler. DETAILED DESCRIPTION

[0016] In order to make the technical means, technical features, invention objectives and technical effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific illustrations.

[0017] like Figure 1-Figure 2As shown, a skid-designed reciprocating compressor unit venting system includes a main air intake pipeline 1, to which a compressor unit body is connected. To prevent the compressor unit body from overpressure and ensure work safety, a venting system body is connected to the main air intake pipeline 1. The venting system body includes an inlet pipeline 2, a multi-stage exhaust pipeline, an automatic venting pipeline 8, a manual venting pipeline 10 and a venting summary pipeline 12. The venting summary pipeline 12 is installed in parallel with the main air intake pipeline 1. The inlet pipeline 2, the multi-stage exhaust pipeline, the automatic venting pipeline 8 and the manual venting pipeline 10 are sequentially connected to the main air intake pipeline 1 and the venting summary pipeline 1. 2, that is: the inlet ends of the inlet pipeline 2, the multi-stage exhaust pipeline, the automatic venting pipeline 8 and the manual venting pipeline 10 are all connected to the total air intake pipeline 1, and the outlet ends of the inlet pipeline 2, the multi-stage exhaust pipeline, the automatic venting pipeline 8 and the manual venting pipeline 10 are all connected to the venting summary pipeline 12. The venting summary pipeline 12 is arranged at a low center of gravity in the skid, and a liquid collecting device 13 is connected to the end of the venting summary pipeline 12 to collect the precipitated liquid that may appear in the venting summary pipeline 12 during the venting process to prevent the liquid from gathering in the venting summary pipeline 12, and the venting summary pipeline 12 can be connected to the flare pipeline outside the skid.

[0018] like Figure 1 As shown, the compressor unit body includes a first-stage compression cylinder 14, a first-stage cooler 15, a second-stage compression cylinder 16 and a second-stage cooler 17. The first-stage compression cylinder 14, the first-stage cooler 15, the second-stage compression cylinder 16 and the second-stage cooler 17 are sequentially connected to the main air intake pipeline 1. The first-stage compression cylinder 14, the first-stage cooler 15, the second-stage compression cylinder 16 and the second-stage cooler 17 are all applications of the prior art, and their specific structures are not repeated here.

[0019] like Figure 1 As shown, the inlet pipeline 2 is connected to the main air intake pipeline 1 at the front end of the first-stage compression cylinder 14, and is combined with the upstream equipment of the station. An inlet safety valve 3 is connected to the inlet pipeline 2 to protect the compressor unit body from the influence of the upstream high-pressure gas. The inlet safety valve 3 is designed in coordination with the upstream equipment, and the inlet safety valve 3 is selected according to the fire condition, which has high safety. The multi-stage exhaust pipeline is set to two stages according to the structure of the compressor unit body, including a primary exhaust pipeline 4 and a secondary exhaust pipeline 6. The inlet end of the primary exhaust pipeline 4 is connected to the main air intake pipeline 1 between the primary compression cylinder 14 and the primary cooler 15, and the outlet end of the primary exhaust pipeline 4 is connected to the venting summary pipeline 12. A primary exhaust safety valve 5 is installed on the primary exhaust pipeline 4. The inlet end of the secondary exhaust pipeline 6 is connected to the main air intake pipeline 1 between the secondary compression cylinder 16 and the secondary cooler 17. The outlet end of the secondary exhaust pipeline 6 is connected to the venting summary pipeline 12. A secondary exhaust safety valve 7 is installed on the secondary exhaust pipeline 6. The primary exhaust safety valve 5 and the secondary exhaust safety valve 7 are used to protect the compressor unit body to avoid overpressure inside the compressor unit body. The selection of the primary exhaust safety valve 5 and the secondary exhaust safety valve 7 is selected according to the blocking condition of the compressor unit body. The automatic vent line 8 and the manual vent line 10 are connected side by side on the main air intake line 1 at the rear end of the secondary cooler 17, and the inlet ends of the automatic vent line 8 and the manual vent line 10 are both connected to the main air intake line 1, and the outlet ends of the automatic vent line 8 and the manual vent line 10 are both connected to the vent collection pipeline 12 and are located at the front end of the liquid collecting device 13. An automatic vent valve 9 is installed on the automatic vent line 8. The automatic vent valve 9 adopts a single-acting pneumatically controlled ball valve to ensure automatic pressure relief when the compressor unit body is shut down. A manual vent valve 11 is installed on the manual vent line 10. The manual vent valve 11 is used to achieve manual pressure relief when the automatic vent valve 9 fails. The manual vent valve 11 adopts a manual ball valve with the same caliber as the automatic vent valve 9 to ensure the venting efficiency.

[0020] like Figure 1 and Figure 2 As shown, the liquid collecting device 13 includes a liquid collecting tank 131, a displacement pipeline 132 and a drainage pipeline 134. The liquid collecting tank 131 is installed downstream of the venting and collecting pipeline 12 and is placed on the edge of the skid. The liquid collecting tank 131 is connected to the venting and collecting pipeline 12 through a liquid collecting pipeline 136, and is used to collect and discharge condensed liquid that may be precipitated in the venting and collecting pipeline 12. A liquid collecting shut-off valve 137 is installed on the liquid collecting pipeline 136 to control the on-off of the liquid collecting pipeline 136. The displacement pipeline 132 and the drainage pipeline 134 are both connected to the liquid collecting tank 131. A liquid collecting shut-off valve 137 is installed on the liquid collecting pipeline 136 to control the on-off of the liquid collecting pipeline 136. A displacement gas shut-off valve 133 is installed on the displacement pipeline 132 to control the on-off of the displacement pipeline 132. A drainage shut-off valve 135 is installed on the drainage pipeline 134 to control the on-off of the drainage pipeline 134. A liquid level window 138 and a liquid level switch 139 are installed on the liquid collecting tank 131. The liquid level window 138 is used to observe the height of the liquid level in the liquid collecting tank 131, and the liquid level switch 139 is used to achieve high liquid level shutdown protection in the liquid collecting tank 131 to avoid excessive liquid in the liquid collecting tank 131.

[0021] The liquid collecting shut-off valve 137 is opened to connect the venting collecting pipeline 12 with the liquid collecting tank 131. When condensed liquid is precipitated in the venting collecting pipeline 12, the liquid flows into the liquid collecting tank 131 through the liquid collecting pipeline 136. When the liquid level in the liquid collecting tank 131 is observed to be high through the liquid level window 138 and / or the liquid level switch 139 sends an alarm signal, the liquid collecting shut-off valve 137 is closed, the replacement gas shut-off valve 133 and the drain shut-off valve 135 are opened, and replacement gas is introduced into the liquid collecting tank 131 through the replacement pipeline 132 to purge the liquid in the liquid collecting tank 131 and discharge the liquid to the downstream of the unit through the drain pipeline 134. When it is monitored that the liquid in the liquid collecting tank 131 is drained, the replacement gas shut-off valve 133 and the drain shut-off valve 135 are closed, and the liquid collecting shut-off valve 137 is opened to allow the liquid collecting tank 131 to re-enter the liquid collecting state.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should belong to the technical scope of the present invention.

Claims

1. A skid-type reciprocating compressor unit venting system, comprising a main air intake pipeline (1), on which a compressor unit body is arranged, characterized in that: A venting system body is arranged on the main air intake pipeline (1), and the venting system body comprises an inlet pipeline (2), a multi-stage exhaust pipeline, an automatic venting pipeline (8) and a venting collection pipeline (12). The venting collection pipeline (12) is arranged side by side with the main air intake pipeline (1). The inlet pipeline (2), the multi-stage exhaust pipeline and the automatic venting pipeline (8) are arranged in sequence between the main air intake pipeline (1) and the venting collection pipeline (12). An inlet safety valve (3) is arranged on the inlet pipeline (2), an automatic venting valve (9) is arranged on the automatic venting pipeline (8), and a liquid collecting device (13) is arranged at the end of the venting collection pipeline (12).

2. The skid-mounted reciprocating compressor unit venting system according to claim 1 is characterized in that: The liquid collecting device (13) comprises a liquid collecting tank (131), a displacement pipeline (132) and a liquid discharge pipeline (134); the liquid collecting tank (131) is connected to the venting collection pipeline (12) via the liquid collecting pipeline (136); the displacement pipeline (132) and the liquid discharge pipeline (134) are both connected to the liquid collecting tank (131); a liquid collecting shut-off valve (137) is provided on the liquid collecting pipeline (136); a displacement gas shut-off valve (133) is provided on the displacement pipeline (132); and a liquid discharge shut-off valve (135) is provided on the liquid discharge pipeline (134).

3. The skid-designed reciprocating compressor unit venting system according to claim 2 is characterized by: The liquid collecting tank (131) is provided with a liquid level window (138) and a liquid level switch (139); the liquid level window (138) is used to observe the liquid level height in the liquid collecting tank (131); and the liquid level switch (139) is used to achieve high liquid level shutdown protection in the liquid collecting tank (131).

4. The skid-designed reciprocating compressor unit venting system according to claim 1 is characterized by: The compressor unit body comprises a primary compression cylinder (14), a primary cooler (15), a secondary compression cylinder (16) and a secondary cooler (17) which are sequentially connected in series.

5. The skid-designed reciprocating compressor unit venting system according to claim 4 is characterized by: The inlet pipeline (2) is connected to the main air intake pipeline (1) before the first-stage compression cylinder (14), the automatic venting pipeline (8) is connected to the main air intake pipeline (1) after the second-stage cooler (17), the multi-stage exhaust pipeline comprises a first-stage exhaust pipeline (4) and a second-stage exhaust pipeline (6), the inlet end of the first-stage exhaust pipeline (4) is connected to the main air intake pipeline (1) between the first-stage compression cylinder (14) and the first-stage cooler (15), the outlet end of the first-stage exhaust pipeline (4) is connected to the venting collection pipeline (12), the first-stage exhaust pipeline (4) is provided with a first-stage exhaust safety valve (5), the inlet end of the second-stage exhaust pipeline (6) is connected to the main air intake pipeline (1) between the second-stage compression cylinder (16) and the second-stage cooler (17), the outlet end of the second-stage exhaust pipeline (6) is connected to the venting collection pipeline (12), and the second-stage exhaust pipeline (6) is provided with a second-stage exhaust safety valve (7).

6. The skid-designed reciprocating compressor unit venting system according to claim 4 is characterized by: The venting system body further comprises a manual venting pipeline (10), wherein the manual venting pipeline (10) is arranged in parallel with the automatic venting pipeline (8), and a manual venting valve (11) is arranged on the manual venting pipeline (10).

7. The skid-designed reciprocating compressor unit venting system according to claim 1 is characterized by: The automatic vent valve (9) is a single-acting automatic control ball valve.

8. The skid-designed reciprocating compressor unit venting system according to claim 6 is characterized by: The manual drain valve (11) and the automatic drain valve (9) have the same caliber.

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