CN201621350U - Double-gas source device of emergency stop valve of gas collecting station - Google Patents

Abstract

A double-gas source device of an emergency cut-off valve of a gas gathering station is applied to emergency cut-off control of a natural gas passage safety channel of an oil field gas production station. The system mainly comprises a nitrogen cylinder group, a valve, an air compressor, an air storage tank, a pneumatic emergency cut-off valve and a pipeline; the nitrogen cylinder group is formed by connecting four nitrogen cylinder outlets in parallel on a main pipeline, valves are arranged on the main pipeline, the other end of the main pipeline is respectively connected with pneumatic emergency cut-off valves in parallel, a pipeline is arranged at the gas outlet of the air compressor and is connected with the inlet of the gas storage pipeline, a pipeline is arranged at the outlet of the gas storage pipeline and is connected to the main pipeline between the pneumatic emergency cut-off valves, and the valves are connected with the outlet pipeline of the gas storage tank or the gas storage pipeline. After the double-gas source system is applied, the material resources and financial resources required for frequently replacing the nitrogen cylinder are reduced, and the operation cost of the pneumatic valve is reduced; the pressure storage tank is replaced by the pressure gas storage pipeline, so that the operation safety coefficient is improved, and the equipment management is facilitated; the air source system has small overall dimension and is easy to popularize and apply.

Description

A dual gas source device for an emergency cut-off valve of a gas gathering station

technical field

The utility model relates to the technical field of gas production in oil fields, in particular to an emergency cut-off control device for a natural gas safety channel in a gas production station, which is an emergency cut-off control device that adopts dual gas source control.

Background technique

In the gas gathering station of the oil field, in order to improve the safety factor of the gas gathering station and the pipeline network operation, in case of emergency, the natural gas inlet and outlet passages of the gas gathering station can be cut off in time. The pneumatic valves used in oil field gas production pipelines mainly include the following categories: (1) Pneumatic V-type regulating ball valve; (2) Pneumatic O-type shut-off ball valve; (3) Torque type cylinder ball valve; (4) Electromagnetic diaphragm valve; ( 5) Pneumatic straight stroke diaphragm valve; (6) Electric valve. The pneumatic emergency shut-off valve is a pneumatic O-type shut-off ball valve.

At present, the driving gas source of the pneumatic emergency shut-off valve is a group of nitrogen cylinders connected in parallel. The gas pressure of the nitrogen cylinders is 2-13MPa, and the pressure after decompression is 1MPa. Use the pressure of the nitrogen cylinder as the driving force to close the pneumatic emergency shut-off valve. The gas supply process of nitrogen cylinders is as follows: four nitrogen cylinders are connected in parallel, and after confluence, they are decompressed to reach each pneumatic emergency shut-off valve. The nitrogen pipeline is made of aluminum pipe fittings. Due to the large number of pneumatic emergency cut-off valves, the nitrogen cylinder has the following problems as the gas supply unit: (1) The nitrogen cylinder is the only gas supply source, there is no backup gas source, and there is no replacement gas source in case of failure; (2) The capacity of the nitrogen cylinder Small size, limited available gas volume, resulting in frequent replacement of nitrogen cylinders; (3) manual transportation of nitrogen cylinders, resulting in additional manpower and material resources, and increased operating costs of pneumatic emergency shut-off valves; (4) nitrogen cylinders cannot be replaced in time due to weather and road problems , affecting the normal and safe operation of the pneumatic emergency shut-off valve.

Utility model content

The purpose of this utility model is: to provide a dual gas source device for an emergency shut-off valve in a gas gathering station, which uses an air compressor to supply air to provide a control gas source for the pneumatic emergency shut-off valve, and uses a nitrogen cylinder group as a backup gas source, which can meet the requirements of natural gas Requirements for explosion-proof grades in production sites and requirements for shock and noise reduction to eliminate potential safety hazards in gas gathering stations; improve the operating efficiency of pneumatic emergency shut-off valves.

The technical scheme adopted by the utility model is: the dual gas source device of the emergency shut-off valve of the gas gathering station, which is mainly composed of nitrogen cylinders, valves, air compressors, gas storage tanks, pneumatic emergency shut-off valves and pipelines; the nitrogen cylinders are composed of four The outlets of two nitrogen cylinders are connected in parallel on the main line, and there are valves on the main line, and the other ends of the main line are respectively connected in parallel with pneumatic emergency shut-off valves. The inlet of the pipeline, the outlet of the gas storage tank or the gas storage pipeline are connected to the main line between the pneumatic emergency shut-off valves, and the outlet pipeline of the gas storage tank or the gas storage pipeline is connected with a valve.

The driving air source pressure of the pneumatic emergency shut-off valve is 0.5-0.7MPa.

In order to provide relatively dry and clean compressed air, a filter and dryer are connected to the outlet pipeline of the air compressor. The air compressor provides an air pressure of 1MPa and a displacement of 0.9m ³ /h.

The process flow of the dual gas source device for the emergency shut-off valve of the gas gathering station is as follows: Refer to Figure 1.

Under normal conditions: the valves 2 on the outlet main lines of the four nitrogen cylinders are closed; the valves 2 connected to the outlet pipelines of the gas storage tank 4 or the gas storage pipeline are opened. The air compressor 3 produces compressed air with a pressure of 1MPa, which enters the air storage tank 4 or the pressure air storage pipeline after three-stage filtration and drying. When the air pressure is lower than 0.5MPa, the air compressor 3 starts to supply air, and the pressure is higher than 1MPa. When the air compressor 3 stops running, it is ensured that the air pressure provided is not less than 0.5MPa, and the air pressure for the connected pneumatic emergency shut-off valve 5 is provided with control air pressure.

In a special case: the valve 2 on the outlet main line of the four nitrogen cylinders is opened, the outlet pipeline of the gas storage tank 4 or the gas storage pipeline is connected to the valve 2 and closed, and the nitrogen gas in the nitrogen cylinder group 1 is confluent and depressurized. 1MPa, enter the main gas supply pipeline.

The pipeline (shown by dotted line) controlled by the pneumatic emergency shut-off valve 5 is a natural gas pipeline, and the natural gas pipeline is connected to the inlet pipeline of the heating furnace 6. After the natural gas is preheated in the heating furnace 6, it is discharged from the outlet pipeline of the heating furnace 6 and transported to The next processing procedure.

Beneficial effects of the utility model: The dual gas source device for the emergency shut-off valve of the gas gathering station of the utility model can make the pneumatic emergency shut-off valve 5 run continuously for a long time, which improves the operating safety factor of the gas gathering station; after applying the dual gas source system, it reduces It saves the material and financial resources required for frequent replacement of nitrogen cylinders, and reduces the operating cost of pneumatic valves; uses pressure gas storage pipelines instead of pressure storage tanks, improves the operating safety factor, and facilitates equipment management; the gas source system has small dimensions and is easy to popularize and apply.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the dual gas source device for the emergency cut-off valve of the gas gathering station of the utility model. What dashed line represents is the natural gas pipeline controlled by pneumatic emergency shut-off valve 5, which does not belong to the scope of protection of the utility model.

In the figure, 1. Nitrogen cylinder group, 2. Valve, 3. Air compressor, 4. Gas storage tank, 5. Pneumatic emergency shut-off valve, 6. Heating furnace.

Detailed ways

Embodiment 1: Taking a gas-gathering station emergency shut-off valve dual gas source device as an example, the utility model is further described in detail.

See Figure 1. The utility model gas-gathering station emergency shut-off valve dual gas source device is mainly composed of nitrogen cylinder group 1, valve 2, air compressor 3, gas storage tank 4, pneumatic emergency shut-off valve 5 and pipeline; the drive of pneumatic emergency shut-off valve 5 The air source pressure is 0.5~0.7MPa. Nitrogen cylinder group 1 is composed of four nitrogen cylinder outlets connected in parallel to the main line. The gas pressure of the nitrogen cylinder is 2-13MPa, and the pressure after decompression is 1MPa. There is a manual valve 2 on the main line, and 23 pneumatic emergency shut-off valves 5 are respectively connected in parallel at the other end of the main line.

The air supply pressure of the compressor is 1MPa, and the displacement is 0.9m ³ /h. The gas outlet of the air compressor 3 has a pipeline connected to the inlet of the gas storage pipeline. The gas storage pipeline consists of a 20m pipeline with a diameter of 219mm. The volume of the pressure gas storage pipeline is 0.62m ³ . The pressure gas storage pipeline is equipped with a pressure detection and sewage discharge device. The outlet of the gas storage pipeline has a pipeline connected to the main line between the pneumatic emergency shut-off valves 5, and a manual valve 2 is connected to the outlet pipeline of the gas storage pipeline.

A three-stage filter and a drier are connected to the outlet pipeline of the air compressor 3 . The air compressor 3 provides an air pressure of 1MPa and a displacement of 0.9m ³ /h. After the compressed air is filtered and dried, it meets the requirements of the valve driving gas, and the water dew point reaches below -40°C. All equipment meets the explosion-proof level requirements of natural gas production occasions, and has shock and noise reduction settings to meet production needs. When the air supply pressure downstream of the compressor is higher than 1MPa, the compressor stops; when the downstream pressure is lower than 0.5MPa, the air compressor starts to run.

The dual gas source device of the emergency shut-off valve of the gas gathering station is skid-mounted on the base, and the external dimensions of the base are 5m in length and 1.2m in width.

Claims (2)

1. A dual gas source device for an emergency shut-off valve in a gas gathering station, mainly composed of a nitrogen cylinder group (1), a valve (2), an air compressor (3), an air storage tank (4), and a pneumatic emergency shut-off valve (5) The nitrogen cylinder group (1) is composed of four nitrogen cylinder outlets connected in parallel on the main line, with a valve (2) on the main line, and a pneumatic emergency shut-off valve (5) connected in parallel at the other end of the main line. It is characterized in that: the gas outlet of the air compressor (3) has a pipeline connected to the inlet of the gas storage tank (4) or the gas storage pipeline, and the outlet of the gas storage tank (4) or the gas storage pipeline has a pipeline connected to the pneumatic emergency shut-off valve ( 5) on the main line between them, a valve (2) is connected to the outlet pipeline of the gas storage tank (4) or the gas storage pipeline. 2. The dual gas source device for the emergency cut-off valve of the gas gathering station according to claim 1, characterized in that: a filter and a dryer are connected to the outlet pipeline of the air compressor (3).

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