An on-line automatic drainage system for large-diameter natural gas transmission pipelines

Abstract

The utility model provides a kind of large-diameter natural gas conveying pipeline on-line automatic drainage system, including the gas pipeline being horizontally arranged, it is characterized in that, the middle part of the gas pipeline forms water collecting cavity, the water collecting cavity is located gas pipeline downside, and the bottom end of water collecting cavity is connected with drain pipe, the bottom end of drain pipe is connected with water collecting tank, drain valve is equipped on drain pipe, and the drain valve is connected with controller, first liquid level sensor for detecting water level in water collecting cavity is equipped on the water collecting cavity, and the first liquid level sensor is connected with controller.The utility model sets up water collecting cavity on gas pipeline, so as to be convenient for the centralized collection in water collecting cavity in gas pipeline, and water in water collecting cavity is discharged to water collecting tank through drain pipe by controller control drain valve, compared with traditional manual mode, it is simple and convenient, time-saving and labor-saving.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline equipment technology and relates to an online automatic drainage system for large-diameter natural gas transmission pipelines. Background Technology

[0002] Natural gas, as a primary raw material for chemical production, is typically transported via large-diameter pipelines. During long-term operation, especially during long-distance pipeline transport in winter, excessive water content in natural gas frequently occurs, impacting chemical safety in the following ways: 1. Moisture reacts with acidic gases (such as CO2 and H2S) in natural gas to form acidic solutions, leading to corrosion of the pipeline's inner wall. This corrosion can be uniform or form localized pits. Corrosion weakens the pipeline's structural strength, shortens its service life, and in severe cases, may cause leaks or even ruptures, resulting in environmental pollution and safety accidents. Furthermore, under high pressure and low temperature conditions, light hydrocarbons in natural gas react with water to form solid hydrates. The formation of hydrates can also cause pipeline blockage, affecting normal natural gas transport. The formation and decomposition of hydrates also generate additional heat and pressure changes, damaging the pipeline. Due to the moisture and other impurities in the gas, scale or ice easily accumulates at low points in the pipeline, affecting normal operation and gas transmission efficiency. Traditional drainage methods typically require regular manual inspection and discharge, which is time-consuming, labor-intensive, prone to missed detections, and poses safety hazards. Utility Model Content

[0003] The purpose of this invention is to address the problem of high prices and heavy burdens on enterprises associated with existing natural gas pipeline drainage equipment by providing an online automatic drainage system for large-diameter natural gas transmission pipelines.

[0004] Therefore, the present invention adopts the following technical solution: An online automatic drainage system for a large-diameter natural gas transmission pipeline includes a horizontally arranged gas transmission pipeline. A water collection chamber is formed in the middle of the gas transmission pipeline and is connected to the pipeline. The water collection chamber is located below the gas transmission pipeline. A drain pipe is connected to the bottom end of the water collection chamber. A water collection tank is connected to the bottom end of the drain pipe. A drain valve is provided on the drain pipe. The drain valve is connected to a controller. A first liquid level sensor for detecting the water level in the water collection chamber is provided on the water collection chamber. The first liquid level sensor is connected to the controller.

[0005] Furthermore, a gas phase balance pipe is connected to the top of the water collection tank, and an air outlet is provided on the upper side of the gas transmission pipe. The gas phase balance pipe is connected to the air outlet, and an air transmission valve is provided on the gas phase balance pipe. The air transmission valve is connected to the controller.

[0006] Furthermore, the controller is a PLC controller.

[0007] Furthermore, the water collection tank is equipped with a second liquid level sensor for detecting the water level inside the tank, and a water supply pipe is connected to the bottom of the water collection tank. The water supply pipe is equipped with a water supply valve and a water supply pump. The controller is connected to the second liquid level sensor, the water supply valve, and the water supply pump respectively.

[0008] The advantages of this utility model are as follows: a water collection chamber is set on the gas transmission pipeline to collect the water in the pipeline. The water in the water collection chamber is discharged into the water collection tank through the drain pipe by the controller through the drain valve. Compared with the traditional manual method, it is simple, convenient, time-saving and labor-saving. A gas phase balance pipe is connected to the water collection tank. When the water in the water collection tank is discharged by the water pump, the gas pressure balance in the water collection tank can be maintained. The structure is simple and the use is convenient. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a control principle diagram of the present invention; In the diagram, 1-gas delivery pipe, 2-water collection chamber, 3-drain pipe, 4-water collection tank, 5-drain valve, 6-controller, 7-first liquid level sensor, 8-second liquid level sensor, 9-water delivery pipe, 10-water delivery valve, 11-water delivery pump, 12-gas phase balance pipe, 13-gas outlet, 14-gas delivery valve. Detailed Implementation

[0010] The present invention will now be described in detail with reference to the accompanying drawings: like Figure 1As shown, an online automatic drainage system for a large-diameter natural gas transmission pipeline includes a horizontally arranged gas transmission pipeline 1. A water collection chamber 2, connected to the middle of the gas transmission pipeline 1, is formed in the middle of the gas transmission pipeline 1. The water collection chamber 2 is located below the gas transmission pipeline 1, and water in the gas transmission pipeline 1 can be collected and temporarily stored in the water collection chamber 2. Specifically, the water collection chamber 2 is located at a lower position on the gas transmission pipeline to facilitate the flow of water in the pipeline into the water collection chamber 2, thereby improving the water collection effect. A drain pipe 3 is connected to the bottom end of the water collection chamber 2, and the water collected in the water collection chamber 2 can be discharged through the drain pipe 3 to prevent excessive water accumulation and overflow in the water collection chamber 2. The bottom end of the drain pipe 3 is connected to... There is a water collection tank 4, and a drain valve 5 is installed on the drain pipe 3. Water discharged from the drain pipe 3 can be collected by the water collection tank 4. The drain valve 5 is connected to a controller 6, which can be a conventional PLC controller. The water collection chamber 2 is equipped with a first liquid level sensor 7 for detecting the water level in the water collection chamber 2. The first liquid level sensor 7 is connected to the controller 6. When the first liquid level sensor 7 detects that the water level in the water collection chamber 2 reaches a set value, the controller 6 controls the drain valve 5 to open, and the water in the water collection chamber 2 is transported to the water collection tank 4 through the drain pipe 3. The water collection tank 4 is equipped with a second liquid level sensor for detecting the water level in the water collection tank 4. 8. A water supply pipe 9 is connected to the bottom of the water collection tank 4. A water supply valve 10 and a water supply pump 11 are installed on the water supply pipe 9. Water from the water collection tank 4 can be transported to a wastewater treatment plant or other wastewater treatment equipment for treatment through the water supply pipe 9. The controller 6 is connected to the second liquid level sensor 8, the water supply valve 10, and the water supply pump 11. When the second liquid level sensor 8 detects that the water level in the water collection tank 4 has reached a set value, it sends a signal to the controller 6. The controller 6 then opens the water supply valve 10 and the water supply pump 11, allowing water from the water collection tank 4 to be transported through the water supply pipe 9 under the action of the water supply pump 11. To prevent water from overflowing the water collection tank 4... The water tank 4 is flattened by the action of the water pump 11. The top of the water tank 4 is connected to the gas phase balance pipe 12. The upper side of the gas pipeline 1 is provided with the gas outlet 13. The gas phase balance pipe 12 is connected to the gas outlet 13. The gas phase balance pipe 12 is used to maintain the gas pressure balance in the water tank 4. At the same time, it can also prevent the water pump 11 from flattening the water tank 4 when it is running. The gas phase balance pipe 12 is provided with the gas supply valve 14. The gas supply valve 14 is connected to the controller 6. When the water pump 11 starts, the controller 6 simultaneously controls the gas supply valve 14 to open. The gas in the gas pipeline 1 is input into the water tank 4 through the gas phase balance pipe 12 to ensure the pressure in the water tank 4.

[0011] The method of using this utility model is as follows: After natural gas has been transported for a period of time, water in the gas pipeline 1 flows into the water collection chamber 2 for collection. When the water level in the water collection chamber 2 reaches the set maximum value, the first liquid level sensor 7 sends a signal to the controller 6. The controller 6 controls the drain valve 5 to open, and the water in the water collection chamber 2 is transported to the water collection tank 4 through the drain pipe 3 for collection. When the first liquid level sensor 7 detects that the water in the water collection chamber 2 has reached the set minimum value, the controller 6 controls the drain valve 5 to close.

[0012] When the water level in the collection tank 4 reaches the set maximum value, the second liquid level sensor 8 sends a signal to the controller 6. The controller 6 controls the water supply valve 10, water supply pump 11, and gas supply valve 14 to open, so that the water collection tank 4 is transported to the wastewater treatment plant or other wastewater treatment equipment through the water supply pipe 9 under the action of the water supply pump 11. During the transportation process, the natural gas in the gas supply pipeline 1 enters the collection tank 4 through the gas phase balance pipe 12 to maintain the gas pressure balance in the collection tank 4 and prevent the water supply pump 11 from deflating the collection tank 4. When the water level in the collection tank 4 reaches the set minimum value, the controller 6 controls the water supply valve 10, water supply pump 11, and gas supply valve 14 to close. Using this device, the collected water in the gas supply pipeline 1 can be automatically discharged without the need for manual handling by operators, which is time-saving, labor-saving, convenient and fast.

Claims

1. An online automatic drainage system for a large-diameter natural gas transmission pipeline, comprising a horizontally arranged gas transmission pipeline (1), characterized in that, A water collection chamber (2) is formed in the middle of the gas transmission pipeline (1) and is connected to the gas transmission pipeline (1). The water collection chamber (2) is located on the lower side of the gas transmission pipeline (1). A drain pipe (3) is connected to the bottom end of the water collection chamber (2). A water collection tank (4) is connected to the bottom end of the drain pipe (3). A drain valve (5) is provided on the drain pipe (3). A controller (6) is connected to the drain valve (5). A first liquid level sensor (7) for detecting the water level in the water collection chamber (2) is provided on the water collection chamber (2). The first liquid level sensor (7) is connected to the controller (6). A gas phase balance pipe (12) is connected to the top of the water collection tank (4). An air outlet (13) is provided on the upper side of the gas transmission pipeline (1). The gas phase balance pipe (12) is connected to the air outlet (13). A gas transmission valve (14) is provided on the gas phase balance pipe (12). The gas transmission valve (14) is connected to the controller (6).

2. The online automatic drainage system for a large-diameter natural gas transmission pipeline according to claim 1, characterized in that, The controller (6) is a PLC controller.

3. The online automatic drainage system for a large-diameter natural gas transmission pipeline according to claim 1, characterized in that, The water collection tank (4) is equipped with a second liquid level sensor (8) for detecting the water level inside the water collection tank (4). The bottom of the water collection tank (4) is connected to a water supply pipe (9). The water supply pipe (9) is equipped with a water supply valve (10) and a water supply pump (11). The controller (6) is connected to the second liquid level sensor (8), the water supply valve (10) and the water supply pump (11) respectively.

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