Micro-positive pressure maintaining device for torch system of oil and gas field station
By designing a micro-positive pressure maintenance device in the flare system of oil and gas stations, and using separators and valve systems to control the entry of combustible gas into the flare system, the problems of unstable supply of combustible waste gas and high cost of nitrogen were solved, thus achieving stability and economy of micro-positive pressure in the flare system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2026-03-24
AI Technical Summary
In existing technologies, methods for maintaining a slight positive pressure in the flare system of oil and gas stations have problems such as unstable supply of combustible waste gas, high cost of nitrogen source, resource waste and risk of flameout, leading to safety accidents and increased operating costs.
Design a micro-positive pressure maintenance device for an oil and gas station flare system. The combustible gas from the oil and gas station is separated by a separator and then controlled to enter the flare system through a first main valve, a pressure regulating valve, and a second main valve. A bypass pipeline and a check valve are set up to ensure the stability of the micro-positive pressure of the system and to provide a backup path in case of pressure regulating valve failure.
This system utilizes the combustible gas itself at the oil and gas station to maintain a slightly positive pressure in the flare system, reducing investment in nitrogen production equipment and nitrogen procurement costs, avoiding resource waste, and ensuring that the system can still maintain a slightly positive pressure during pressure regulating valve maintenance, thereby improving the system's safety and economy.
Smart Images
Figure CN224033820U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to oil and gas field station torch system technical field, concretely relates to a kind of oil and gas field station torch system micro-positive pressure maintaining device. BACKGROUND
[0002] Oil and gas field station is the place of oil and gas production or storage, including land station and offshore production platform and other facilities, to ensure safety and environmental protection, the methane and other greenhouse gases released in oil and gas field station, toxic and harmful gases that can be treated by combustion and a large amount of combustible gas cannot be directly discharged into the atmosphere, therefore, oil and gas field station usually sets up torch system, by passing methane and other greenhouse gases released in oil and gas field station, toxic and harmful gases and a large amount of combustible gas into torch system and burning at torch head, to achieve the purpose of ensuring safety and environmental protection.
[0003] Because of the flame of burning, in order to prevent the flame burning outside the torch system from entering the torch system and causing safety accidents, the conventional method is to pass nitrogen, combustible waste gas into the torch system, or directly introduce a combustible gas from the gas phase system of the oil and gas field station into the torch system, to ensure the micro-positive pressure inside the torch system, so that the flame burning outside will not enter the torch system from the torch head due to low pressure inside the torch system, to prevent safety accidents.
[0004] However, the above conventional method has the following problems: due to different processing technologies of oil and gas field station, combustible waste gas cannot be continuously and stably supplied, and in some oil and gas field stations, there is no combustible waste gas; when nitrogen is used to maintain the micro-positive pressure inside the torch system, an external nitrogen source is needed, and the nitrogen source is usually provided by nitrogen making equipment or purchased compressed nitrogen or liquefied nitrogen, which increases the operating cost of the oil and gas field station, and when the released gas is reduced or the equipment of the oil and gas field station is running normally without released gas, passing nitrogen into the torch system will cause the flame at the torch head to be extinguished, and the flame at the torch head being extinguished will cause the subsequent released gas entering the torch system to be unable to burn directly at the torch head; when a combustible gas is directly introduced from the gas phase system of the oil and gas field station to maintain the micro-positive pressure inside the torch system, due to the lack of precise regulating facilities, the continuous introduction of combustible gas into the torch system will cause a large amount of waste of resources. UTILITY MODEL CONTENTS
[0005] In view of the defects of the above prior art, the utility model provides a kind of oil and gas field station torch system micro-positive pressure maintaining device, which can effectively utilize the combustible gas of oil and gas field station itself, reduce the investment of nitrogen making equipment in the early stage of the project or the cost of purchasing nitrogen in operation, and accurately control the combustible gas entering the torch system from the separator, to avoid waste of resources.
[0006] The technical solution adopted by the utility model to solve its technical problems is:
[0007] The oil and gas field station flare system micro-positive pressure maintaining device comprises a diffusing gas main pipeline, one end of the diffusing gas main pipeline is connected with an air inlet end of a flare system, a plurality of diffusing gas branch pipelines are connected on the diffusing gas main pipeline, each of the diffusing gas branch pipelines is used for connecting a corresponding device in the oil and gas field station with the diffusing gas main pipeline, the diffusing gas main pipeline is further connected with a combustible gas outlet end of a separator through a combustible gas pipeline, an inlet end of the separator is connected with a combustible gas conveying pipeline of the oil and gas field station, the separator is used for separating combustible gas mixed with other impurities entering the separator, the combustible gas pipeline is sequentially provided with a first main valve, a pressure regulating valve and a second main valve along a flow direction, a bypass pipeline is connected on the combustible gas pipeline between an upstream side of the first main valve and a downstream side of the second main valve, and a bypass valve is arranged on the bypass pipeline.
[0008] Further, a one-way valve is arranged on the combustible gas pipeline on the downstream side of the bypass pipeline.
[0009] Further, the bypass valve is two and is arranged in series on the bypass pipeline.
[0010] Further, a first emptying pipeline is connected on the combustible gas pipeline between the pressure regulating valve and the first main valve, a first emptying valve is arranged on the first emptying pipeline; a second emptying pipeline is connected on the combustible gas pipeline between the pressure regulating valve and the second main valve, and a second emptying valve is arranged on the second emptying pipeline.
[0011] Further, a first plug is threadedly connected at a free end of the first emptying pipeline on the downstream side of the first emptying valve, and a second plug is threadedly connected at a free end of the second emptying pipeline on the downstream side of the second emptying valve.
[0012] Further, the combustible gas pipeline is connected on the diffusing gas main pipeline at a position close to the other end of the diffusing gas main pipeline, and a blind plate is arranged on the other end of the diffusing gas main pipeline.
[0013] Further, the combustible gas pipeline comprises two sections and is respectively referred to as a first combustible gas pipeline and a second combustible gas pipeline, an upstream end of the first combustible gas pipeline is connected with the combustible gas outlet end of the separator, a downstream end of the second combustible gas pipeline is connected on the diffusing gas main pipeline, the pressure regulating valve is connected on a connecting pipeline through a flange, an upstream end of the connecting pipeline is connected with a downstream end of the first combustible gas pipeline through a first reducing pipeline, and a downstream end of the connecting pipeline is connected with an upstream end of the second combustible gas pipeline through a second reducing pipeline.
[0014] Further, the first main valve is connected to the first combustible gas pipeline through a flange, and the second main valve is connected to the second combustible gas pipeline through a flange; the first exhaust pipeline is connected to the first combustible gas pipeline, and the first exhaust valve is connected to the first exhaust pipeline through a thread; the second exhaust pipeline is connected to the second combustible gas pipeline, and the second exhaust valve is connected to the second exhaust pipeline through a thread; the bypass pipeline is connected to the first combustible gas pipeline at an upstream end and connected to the second combustible gas pipeline at a downstream end, and the bypass valve is connected to the bypass pipeline through a flange; and the one-way valve is connected to the second combustible gas pipeline through a flange.
[0015] Further, the pressure regulating valve is a gas pressure regulator with an automatic regulating function, used to ensure that the combustible gas pressure on the outlet side of the pressure regulating valve is kept at a set pressure value, and the first main valve, the second main valve, the bypass valve, the first exhaust valve and the second exhaust valve are all manual valves.
[0016] Further, the first main valve, the second main valve, the bypass valve, the first exhaust valve and the second exhaust valve are all one of a ball valve, a gate valve or a stop valve.
[0017] Compared with the prior art, the utility model has the beneficial effects that:
[0018] The oil and gas field station flare system micro-positive pressure maintaining device in the utility model, including the total pipeline of diffusing gas, the total pipeline of diffusing gas one end is connected with the gas inlet end of flare system, the total pipeline of diffusing gas is connected with a plurality of diffusing gas branch pipeline, each diffusing gas branch pipeline is used for connecting the corresponding equipment in oil and gas field station with the total pipeline of diffusing gas, the total pipeline of diffifying gas is still connected with the combustible gas export end of separator through combustible gas pipeline, the import end of separator is connected with the combustible gas conveying pipeline of oil and gas field station, separator is used for separating the combustible gas mixed with other impurities into separator, the combustible gas pipeline is equipped with first main valve, pressure regulating valve and second main valve in turn along the flow direction, the combustible gas pipeline is connected with bypass pipeline between first main valve upstream side and second main valve downstream side, and bypass valve is arranged on bypass pipeline.
[0019] In the utility model, one-way valve is arranged on the combustible gas pipeline of bypass pipeline downstream side. Thus, the reverse flow of combustible gas can be prevented through the arrangement of one-way valve.
[0020] In the utility model, the bypass valve is two and is arranged in series on the bypass pipeline. Thus, when one of the bypass valves is in failure and in the normally open state, the other bypass valve which is not in failure can ensure that the bypass pipeline is in the disconnected state under the normal working state of the oil and gas field station flare system micro-positive pressure maintaining device.
[0021] In the utility model, the combustible gas pipeline between the pressure regulating valve and the first main valve is connected with the first emptying pipeline, and the first emptying pipeline is provided with the first emptying valve; the combustible gas pipeline between the pressure regulating valve and the second main valve is connected with the second emptying pipeline, and the second emptying pipeline is provided with the second emptying valve. Thus, when the pressure regulating valve is in failure and needs to be overhauled, the first main valve and the second main valve are closed and the bypass valve, the first emptying valve and the second emptying valve are opened, the combustible gas in the combustible gas pipeline between the first main valve and the pressure regulating valve enters the first emptying pipeline and is emptied after passing through the first emptying valve, and the combustible gas in the combustible gas pipeline between the pressure regulating valve and the second main valve enters the second emptying pipeline and is emptied after passing through the second emptying valve, so as to facilitate the overhaul of the pressure regulating valve; and under the normal working state of the oil and gas field station flare system micro-positive pressure maintaining device, the first emptying valve and the second emptying valve are in the closed state. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a structural schematic view of the oil and gas field station flare system micro-positive pressure maintaining device in the utility model.
[0023] In the drawing, the reference signs are explained as follows: 1, dispersing gas main pipeline, 2, flare system, 3, dispersing gas branch pipeline, 4, separator, 5, first main valve, 6, pressure regulating valve, 7, second main valve, 8, bypass pipeline, 9, bypass valve, 10, one-way valve, 11, first emptying pipeline, 12, first emptying valve, 13, second emptying pipeline, 14, second emptying valve, 15, first plug, 16, second plug, 17, blind plate, 1801, first combustible gas pipeline, 1802, second combustible gas pipeline, 19, connecting pipeline, 20, first reducing pipeline, 21, second reducing pipeline. DETAILED DESCRIPTION
[0024] The specific embodiments of the utility model are further explained in detail in combination with the drawings. These embodiments are only used for explaining the utility model and are not the limitation of the utility model.
[0025] In the description of the utility model, it is necessary to explain that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0026] In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.
[0027] In addition, in the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.
[0028] As shown in Figure 1 A kind of oil and gas field station flare system micro-positive pressure maintaining device, including diffusion gas main pipeline 1, diffusion gas main pipeline 1 one end is connected with the gas inlet end of flare system 2, diffusion gas main pipeline 1 is connected with multiple diffusion gas branch pipeline 3, each diffusion gas branch pipeline 3 is used to connect corresponding equipment in oil and gas field station with diffusion gas main pipeline 1, diffusion gas main pipeline 1 is also connected with the combustible gas outlet end of separator 4 by combustible gas pipeline, the inlet end of separator 4 is connected with the combustible gas delivery pipeline of oil and gas field station, separator 4 is used to separate combustible gas mixed with other impurities entering separator 4, first main valve 5, pressure regulating valve 6 and second main valve 7 are sequentially provided on combustible gas pipeline along the flow direction, bypass pipeline 8 is connected between the upstream side of first main valve 5 and the downstream side of second main valve 7 on combustible gas pipeline, bypass valve 9 is provided on bypass pipeline 8. Part of diffusion gas branch pipeline 3 flows into diffusion gas, another part of diffusion gas branch pipeline 3 flows into pressure maintaining gas;Wherein diffusion gas is specifically: gas or liquid discharged to ensure that the operating pressure of medium in corresponding equipment in oil and gas field station does not exceed the set value, or gas generated by the change of temperature or pressure;Wherein pressure maintaining gas is specifically: gas for maintaining the pressure of corresponding equipment in oil and gas field station or isolating the medium inside the equipment from harmful medium.
[0029] In the normal working state, the first main valve 5 and the second main valve 7 are in the open state, and the bypass valve 9 is in the closed state. A combustible gas mixed with other impurities from the gas phase system of the oil and gas field station enters the separator 4. The combustible gas and other impurities are separated by the separator 4 and then enter the combustible gas pipeline. The combustible gas enters the flare gas main pipeline 1 in turn through the first main valve 5, the pressure regulating valve 6 and the second main valve 7, and then enters the flare system 2 through the flare gas main pipeline 1 to maintain the micro-positive pressure inside the flare system 2. In addition, the flare gas main pipeline 1 collects the flare gas of the oil and gas field station through a part of the flare gas branch pipeline 3 and collects the pressure maintaining gas of the oil and gas field station through another part of the flare gas branch pipeline 3 and then transports them to the flare system 2. The flare head of the flare system 2 burns the flare gas and the pressure maintaining gas, and then empties. Thus, the micro-positive pressure maintaining device for the flare system of the oil and gas field station uses the combustible gas separated by the separator 4 from the gas phase system of the oil and gas field station as the gas source for maintaining the micro-positive pressure inside the flare system 2, instead of using nitrogen as the gas source, thereby reducing the investment in nitrogen production equipment or the purchase cost of nitrogen. In addition, the pressure regulating valve 6 can accurately regulate the pressure of the combustible gas on the outlet side of the pressure regulating valve 6, thereby accurately regulating the amount of combustible gas used for maintaining the micro-positive pressure inside the flare system 2, avoiding the waste of resources caused by directly introducing a combustible gas from the gas phase system of the oil and gas field station into the flare system 2. When the pressure regulating valve 6 needs to be repaired due to failure, the first main valve 5 and the second main valve 7 are closed and the bypass valve 9 is opened. The combustible gas discharged from the separator 4 first enters the upstream section of the combustible gas pipeline, then enters the bypass pipeline 8, and then enters the downstream section of the combustible gas pipeline and the flare gas main pipeline 1 in turn through the bypass valve 9, and then enters the flare system 2 through the flare gas main pipeline 1 to maintain the micro-positive pressure inside the flare system 2. Therefore, by arranging the first main valve 5, the second main valve 7, the bypass pipeline 8 and the bypass valve 9, the micro-positive pressure inside the flare system 2 can be maintained during the repair of the pressure regulating valve 6.
[0030] The micro-positive pressure maintaining device for the flare system of the oil and gas field station only connects the separator 4 and the flare gas main pipeline 1 through the combustible gas pipeline in the idle area of the oil and gas field station, and arranges the first main valve 5, the pressure regulating valve 6 and the second main valve 7 on the combustible gas pipeline, and arranges the bypass valve 9 on the bypass pipeline 8 which is parallel to the first main valve 5, the pressure regulating valve 6 and the second main valve 7, thereby completing the installation, and thus the installation is simple.
[0031] The combustible gas pipeline on the downstream side of the bypass pipeline 8 is provided with a one-way valve 10. Thus, the one-way valve 10 can prevent the combustible gas from flowing in the reverse direction.
[0032] The separator 4 is a gas-liquid separator or a three-phase separator. The gas-liquid separator can separate combustible gas, oil, water, or a mixture of combustible gas, oil and water. The three-phase separator can separate combustible gas, oil and water.
[0033] In one embodiment, two bypass valves 9 are provided in series on the bypass pipeline 8. When one of the bypass valves 9 fails and is in the open state, the other bypass valve 9 can ensure that the bypass pipeline 8 is in the closed state under normal working conditions of the micro-positive pressure maintaining device of the flare system of the oil and gas field station.
[0034] In one embodiment,
[0035] A first vent pipeline 11 is connected to the combustible gas pipeline between the pressure regulating valve 6 and the first main valve 5, and a first vent valve 12 is arranged on the first vent pipeline 11. A second vent pipeline 13 is connected to the combustible gas pipeline between the pressure regulating valve 6 and the second main valve 7, and a second vent valve 14 is arranged on the second vent pipeline 13.
[0036] When the pressure regulating valve 6 needs to be repaired, the first main valve 5 and the second main valve 7 are closed, and the bypass valve 9, the first vent valve 12 and the second vent valve 14 are opened. The combustible gas in the combustible gas pipeline between the first main valve 5 and the pressure regulating valve 6 enters the first vent pipeline 11 and is vented through the first vent valve 12. The combustible gas in the combustible gas pipeline between the pressure regulating valve 6 and the second main valve 7 enters the second vent pipeline 13 and is vented through the second vent valve 14, so as to facilitate the repair of the pressure regulating valve 6. Under normal working conditions of the micro-positive pressure maintaining device of the flare system of the oil and gas field station, the first vent valve 12 and the second vent valve 14 are in the closed state.
[0037] The first vent pipeline 11 is threadedly connected to the first plug 15 at the free end of the first vent pipeline 11 on the downstream side of the first vent valve 12. The second vent pipeline 13 is threadedly connected to the second plug 16 at the free end of the second vent pipeline 13 on the downstream side of the second vent valve 14.
[0038] Thus, under normal working conditions of the micro-positive pressure maintaining device of the flare system of the oil and gas field station, the first plug 15 can prevent foreign matter from entering the first vent pipeline 11, and the second plug 16 can prevent foreign matter from entering the second vent pipeline 13.
[0039] The combustible gas pipeline comprises two sections and is referred to as a first combustible gas pipeline 1801 and a second combustible gas pipeline 1802 respectively. The upstream end of the first combustible gas pipeline 1801 is connected to the combustible gas outlet end of the separator 4, and the downstream end of the second combustible gas pipeline 1802 is connected to the total combustible gas pipeline 1. The pressure regulating valve 6 is connected to the connecting pipeline 19 through a flange. The upstream end of the connecting pipeline 19 is connected to the downstream end of the first combustible gas pipeline 1801 through a first reducing pipeline 20, and the downstream end of the connecting pipeline 19 is connected to the upstream end of the second combustible gas pipeline 1802 through a second reducing pipeline 21. Preferably, the first main valve 5 is connected to the first combustible gas pipeline 1801 through a flange, and the second main valve 7 is connected to the second combustible gas pipeline 1802 through a flange. The first exhaust pipeline 11 is connected to the first combustible gas pipeline 1801, and the first exhaust valve 12 is connected to the first exhaust pipeline 11 through a threaded connection. The second exhaust pipeline 13 is connected to the second combustible gas pipeline 1802, and the second exhaust valve 14 is connected to the second exhaust pipeline 13 through a threaded connection. The upstream end of the bypass pipeline 8 is connected to the first combustible gas pipeline 1801, and the downstream end is connected to the second combustible gas pipeline 1802. The bypass valve 9 is connected to the bypass pipeline 8 through a flange. The one-way valve 10 is connected to the second combustible gas pipeline 1802 through a flange. In the combustible gas pipeline, the directions of the arrows on the first combustible gas pipeline 1801 and the second combustible gas pipeline 1802 are the directions of the flow of combustible gas. The directions of the arrows on the total combustible gas pipeline 1 are the directions of the flow of combustible gas in the total combustible gas pipeline 1. Figure 1
[0040] The pressure regulating valve 6 is a gas pressure regulator with an automatic regulating function, which is used to ensure that the pressure of the combustible gas on the outlet side of the pressure regulating valve 6 is maintained at a set pressure value, and the set pressure value is controlled within 50 kpag. The first main valve 5, the second main valve 7, the bypass valve 9, the first exhaust valve 12, and the second exhaust valve 14 are all manual valves and are one of a ball valve, a gate valve, or a stop valve. The pressure regulating valve 6, the first main valve 5, the second main valve 7, the bypass valve 9, the first exhaust valve 12, and the second exhaust valve 14 are all off-the-shelf devices purchased on the market.
[0041] In one embodiment, the combustible gas pipeline is connected to the total combustible gas pipeline 1 at a position close to the other end of the total combustible gas pipeline 1, and a blind plate 17 is provided at the other end of the total combustible gas pipeline 1.
[0042] In summary, the micro-positive pressure maintaining device of the flare system of the oil and gas station can effectively utilize the combustible gas of the oil and gas station, reduce the investment of the nitrogen making equipment in the early stage of the project or the cost of purchasing nitrogen gas in the operation, and accurately control the combustible gas entering the flare system 2 from the separator 4 through the pressure regulating valve 6, so that the waste of resources can be avoided.
[0043] The preferred embodiments of the present application are described above, it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.
Claims
1. A micro-positive pressure maintenance device for a flare system in an oil and gas field, comprising a main venting gas pipeline (1), one end of which is connected to the inlet of a flare system (2), and a plurality of branch venting gas pipelines (3) connected to the main venting gas pipeline (1), each branch venting gas pipeline (3) being used to connect corresponding equipment in the oil and gas field to the main venting gas pipeline (1), characterized in that: The main venting gas pipeline (1) is also connected to the combustible gas outlet end of the separator (4) through a combustible gas pipeline. The inlet end of the separator (4) is connected to the combustible gas transmission pipeline of the oil and gas station. The separator (4) is used to separate the combustible gas mixed with other impurities that enter the separator (4). The combustible gas pipeline is provided with a first main valve (5), a pressure regulating valve (6), and a second main valve (7) in sequence along the flow direction. A bypass pipeline (8) is connected between the upstream side of the first main valve (5) and the downstream side of the second main valve (7) on the combustible gas pipeline. A bypass valve (9) is provided on the bypass pipeline (8).
2. The micro-positive pressure maintenance device for an oil and gas station flare system according to claim 1, characterized in that: A one-way valve (10) is provided on the combustible gas pipeline downstream of the bypass pipeline (8).
3. The micro-positive pressure maintenance device for an oil and gas station flare system according to claim 2, characterized in that: The bypass valves (9) are two in number and are connected in series on the bypass pipe (8).
4. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 2, characterized in that: A first vent pipe (11) is connected to the combustible gas pipeline between the pressure regulating valve (6) and the first main valve (5), and a first vent valve (12) is provided on the first vent pipe (11); a second vent pipe (13) is connected to the combustible gas pipeline between the pressure regulating valve (6) and the second main valve (7), and a second vent valve (14) is provided on the second vent pipe (13).
5. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 4, characterized in that: A first plug (15) is threaded at the free end of the first vent pipe (11) downstream of the first vent valve (12), and a second plug (16) is threaded at the free end of the second vent pipe (13) downstream of the second vent valve (14).
6. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 2, characterized in that: The combustible gas pipeline is connected to the main venting gas pipeline (1) at a position near the other end of the main venting gas pipeline (1), and a blind plate (17) is provided at the other end of the main venting gas pipeline (1).
7. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 4, characterized in that: The combustible gas pipeline includes two sections, referred to as the first combustible gas pipeline (1801) and the second combustible gas pipeline (1802). The upstream end of the first combustible gas pipeline (1801) is connected to the combustible gas outlet end of the separator (4), and the downstream end of the second combustible gas pipeline (1802) is connected to the main venting gas pipeline (1). The pressure regulating valve (6) is connected to the connecting pipe (19) through a flange. The upstream end of the connecting pipe (19) is connected to the downstream end of the first combustible gas pipeline (1801) through a first reducing pipe (20), and the downstream end of the connecting pipe (19) is connected to the upstream end of the second combustible gas pipeline (1802) through a second reducing pipe (21).
8. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 7, characterized in that: The first main valve (5) is connected to the first combustible gas pipeline (1801) via a flange, and the second main valve (7) is connected to the second combustible gas pipeline (1802) via a flange; the first vent pipe (11) is connected to the first combustible gas pipeline (1801), the first vent valve (12) is connected to the first vent pipe (11) via a thread, the second vent pipe (13) is connected to the second combustible gas pipeline (1802), and the second vent valve (14) is connected to the second vent pipe (13) via a thread; the upstream end of the bypass pipe (8) is connected to the first combustible gas pipeline (1801) and the downstream end is connected to the second combustible gas pipeline (1802), and the bypass valve (9) is connected to the bypass pipe (8) via a flange; the one-way valve (10) is connected to the second combustible gas pipeline (1802) via a flange.
9. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 4, characterized in that: The pressure regulating valve (6) is a gas pressure regulator with automatic adjustment function, used to ensure that the combustible gas pressure on the outlet side of the pressure regulating valve (6) is maintained at the set pressure value. The first main valve (5), the second main valve (7), the bypass valve (9), the first vent valve (12), and the second vent valve (14) are all manual valves.
10. A micro-positive pressure maintenance device for an oil and gas station flare system according to claim 9, characterized in that: The first main valve (5), the second main valve (7), the bypass valve (9), the first vent valve (12), and the second vent valve (14) are all ball valves, gate valves, or stop valves.