Pipeline natural gas hydrogen sulfide on-line monitoring device

Abstract

The utility model discloses a kind of pipeline natural gas hydrogen sulfide online monitoring devices, including detection shell, linear drive device is set on the detection shell upper end, the output shaft of linear drive device is connected sealing device in detection shell;The sealing device separates detection shell into air cavity, detection cavity;Detection shell outer wall is set exhaust port in air cavity, detection shell outer wall is set gas guide hole in detection cavity, detection shell outer wall is set detection port, the detection port is communicated with air cavity or detection cavity under the control of sealing device.This utility model detection port connection's gas detector is in standby state and contacts with air, avoid the aging of detection probe in gas detector, improve the service life of gas detector, prolong the replacement time of gas detector, reduce safety risk, reduce labor intensity, and improve the accuracy of natural gas hydrogen sulfide content detection.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically to an online monitoring device for hydrogen sulfide in pipeline natural gas. Background Technology

[0002] Hydrogen sulfide is a highly toxic and corrosive gas, widely present in gas fields and associated gases from oil extraction. It accelerates the corrosion of production equipment; concentrations exceeding 10 mg / m³ can significantly reduce its concentration. 3 This poses a health hazard to oil and gas processing operators, with concentrations exceeding 1000 mg / m³. 3 Contact with hydrogen sulfide can cause acute poisoning within seconds. Therefore, it is crucial to accurately monitor the hydrogen sulfide content in natural gas at all times during natural gas production sites and to perform appropriate operations based on the content to ensure personal safety and equipment operation. According to the SN / T2943-2011 "Hydrogen Sulfide Sampling and Testing Procedure," the hydrogen sulfide content in pipeline natural gas is detected using the glass tube coloring method. During measurement, the natural gas is vented at the pipeline testing point, and the test tube is placed at the front end of a negative pressure gas sampler to draw in natural gas. The reagent inside the test tube reacts with the hydrogen sulfide, and the hydrogen sulfide content is read. However, natural gas is flammable and explosive. Venting during the testing process causes combustible gases to escape into the atmosphere, causing air pollution and posing safety hazards at the production site. The test tube is a disposable glass container, resulting in resource waste. Furthermore, air can easily be introduced into the negative pressure gas sampler during gas extraction, affecting the accuracy of the test. In actual production sampling operations, to ensure the health of operators, two operators wearing positive pressure air respirators need to work together, making the operation complex and reducing the timeliness of the test.

[0003] Announcement No. CN220647892U discloses a gas collection pipeline for easy gas detection, including a connecting pipe. A diversion pipe is fixedly connected to the middle of the upper end of the connecting pipe. A valve is fixedly connected to the middle of the outer surface of the diversion pipe. A collection mechanism is fixedly connected to the upper right end of the connecting pipe. Support seats are fixedly connected to the left and right outer surfaces of the connecting pipe. A support box is fixedly connected between the lower ends of the two support seats. Sealing mechanisms are installed at the left and right ends of the connecting pipe. Gas pipelines are installed on the opposite sides of the two sealing mechanisms.

[0004] The existing technology does not distinguish between the air chamber and the detection chamber, and the detector's lifespan is reduced due to prolonged contact with petroleum gas.

[0005] Announcement No. CN108487906B discloses a closed-loop sampling and detection device and method for hydrogen sulfide at the wellhead of an oil well. The device consists of two parts: a sampling assembly and a detection assembly. The detection assembly is installed on the upper part of the sampling assembly. The sampling assembly includes a flow section, a sampling guide pipe, a sampling valve, a sampling tube, a lower connector of the sampler, a spring, a cone valve cone, and a cone valve seat. The detection assembly includes a quick connector, a cone valve top rod, a colorimetric tube connector, a rubber hose, a colorimetric tube, a sampling pump barrel, a piston, a rubber stopper, a piston guide rod, and a handwheel.

[0006] The existing technology requires manual installation of the testing assembly, and the manual installation and removal of the colorimetric tubes can cause residual hydrogen chloride gas to affect the health of the operators.

[0007] Announcement No. CN118858551B discloses an online hydrogen sulfide analyzer, including a hydrogen sulfide sensor, a control fitting, and an outlet connection pipe and an inlet connection pipe connected to both ends of the control fitting. The control fitting has an internal adjustment cavity. A waiting interface is fixedly inserted at the top of the control fitting. A protective connection cavity and a sensor probe are fixedly installed at the bottom of the hydrogen sulfide sensor. The protective connection cavity is inserted into the waiting interface and extends into the analysis flow channel. The internal adjustment cavity has symmetrically opened analysis inlet and comparison inlet, analysis flow channel and comparison flow channel, and comparison outlet and analysis outlet channels. The internal adjustment cavity also has a lateral groove.

[0008] This existing technology does not take into account the pressure of the gas entering the test chamber, nor does it perform standardization of the gas to atmospheric pressure, thus failing to guarantee the accuracy of the test data.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides an online monitoring device for hydrogen sulfide in pipeline natural gas.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] An online monitoring device for hydrogen sulfide in pipeline natural gas includes a detection housing. A linear drive device is installed at the upper end of the detection housing, and the output shaft of the linear drive device is connected to a sealing device inside the detection housing. The sealing device divides the detection housing into an air chamber and a detection chamber. An air vent is provided in the air chamber on the outer wall of the detection housing, and a vent hole is provided in the detection chamber on the outer wall of the detection housing. A detection port is provided on the outer wall of the detection housing, and the detection port is connected to the air chamber or the detection chamber under the control of the sealing device.

[0013] Furthermore, the detection port is connected to the detection channel, the port of the detection channel is connected to the gas detector, and the probe of the gas detector is located in the detection channel.

[0014] Furthermore, the gas detector is a hydrogen sulfide gas detector, and the gas detector is equipped with a data display table.

[0015] Furthermore, the gas guide hole is connected to the collection housing, the lower end of the collection housing is connected to the control channel, the control channel is equipped with a control valve, the side wall of the collection housing is connected to a pressure channel, the port of the pressure channel is connected to a pressure transmitter, and the control channel is used to connect to a natural gas pipeline.

[0016] Furthermore, both the detection housing and the acquisition housing are cylindrical metal structures.

[0017] Furthermore, a linear drive device is installed on the top of the detection housing, the output shaft of which is inserted into the inside of the detection housing, and a sealing device is connected to the end of the output shaft of the linear drive device.

[0018] Furthermore, the sealing device is a piston, which seals against the inner wall of the detection housing, and the linear drive device is an electric push rod, with the piston connected to the push rod end of the electric push rod.

[0019] Furthermore, the vent is connected to a venting and dosing device, which includes a dosing pipe and an exhaust pipe. The dosing pipe is connected to the vent, and the exhaust pipe is connected to the dosing pipe. The dosing pipe is filled with a hydrogen sulfide removal agent.

[0020] Furthermore, the control valve is a solenoid valve.

[0021] Furthermore, it also includes a programmable controller, which is electrically connected to a control valve, a linear drive, a pressure transmitter, and a gas detector.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The gas detector of this utility model is in contact with air in standby mode, which avoids the aging of the detection probe in the gas detector, improves the service life of the gas detector, extends the replacement time of the gas detector, reduces safety risks, reduces labor intensity, and improves the accuracy of detecting hydrogen sulfide content in natural gas.

[0024] 2. This utility model collects gas from the pipeline, measures the hydrogen sulfide content in the natural gas, and after the measurement is completed, pushes the measured gas back into the original process. For the small amount of hydrogen sulfide gas that escapes, it is absorbed by hydrogen sulfide removal agent, thus fundamentally eliminating environmental air pollution.

[0025] 3. This utility model achieves control of the gas pressure through a linear drive device, a sealing device, a control valve, and a pressure transmitter, enabling the gas detector to operate within the optimal gas pressure range; and achieves automated gas detection through a programmable controller to generate data curves. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an online monitoring device for hydrogen sulfide in pipeline natural gas according to this utility model.

[0027] Figure 2 This is a top view of an online monitoring device for hydrogen sulfide in pipeline natural gas according to this utility model.

[0028] Figure 3 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0029] In the diagram: 1. Acquisition housing, 2. Control valve, 3. Detection housing, 4. Sealing device, 5. Linear drive device, 6. Pressure transmitter, 7. Gas detector, 8. Exhaust and dosing device. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] Please see Figure 1 , Figure 2This utility model provides an online monitoring device for hydrogen sulfide in pipeline natural gas, including a detection housing 3. A linear drive device 5 is provided on the top of the detection housing 3. The output shaft of the linear drive device 5 is inserted into the interior of the detection housing 3. The end of the output shaft of the linear drive device 5 is connected to a sealing device 4. The sealing device 4 divides the detection housing 3 into an air chamber and a detection chamber. An air vent is provided on the outer wall of the detection housing 3 in the air chamber. A vent hole is provided on the outer wall of the detection housing 3 in the detection chamber. A detection port is provided on the outer wall of the detection housing 3. The detection port is connected to the air chamber or the detection chamber under the control of the sealing device 4.

[0033] Furthermore, the detection port is connected to the detection channel, and the port of the detection channel is connected to the gas detector 7, which is a hydrogen sulfide gas detector. The probe of the gas detector 7 is located in the detection channel, and the gas detector 7 is equipped with a data display table to facilitate the operator to read the hydrogen sulfide gas content.

[0034] Specifically, the detection channel is welded to the detection port.

[0035] Furthermore, the gas guide hole is connected to the collection housing 1, the lower end of the collection housing 1 is connected to the control channel, the control channel is equipped with a control valve 2, the side wall of the collection housing 1 is connected to a pressure channel, the port of the pressure channel is connected to a pressure transmitter 6, the control channel is connected to a natural gas pipeline to collect natural gas for hydrogen sulfide detection, and the pressure transmitter 6 can monitor the pressure inside the collection housing 1 in real time.

[0036] Specifically, the control valve 2 is a solenoid valve.

[0037] Specifically, both the detection housing 3 and the acquisition housing 1 are cylindrical metal structures.

[0038] Specifically, the detection housing 3 and the acquisition housing 1 are connected by a flange and a sealing gasket.

[0039] Furthermore, the sealing device 4 is a piston, which seals against the inner wall of the detection housing 3. The linear drive device 5 is an electric push rod, which is connected to the push rod end of the electric push rod. The sealing device 4 is driven to move up and down by the linear drive device 5, so that the gas detector 7 is connected to the detection chamber or air chamber. At the same time, by controlling the size of the detection chamber, the gas pressure in the detection chamber is adjusted to keep the pressure at normal pressure.

[0040] Specifically, the piston is connected to the push rod end of the electric push rod by bolts.

[0041] Furthermore, it also includes a programmable controller, which is electrically connected to the control valve 2, the linear drive device 5, the pressure transmitter 6, and the gas detector 7.

[0042] A control method for an online monitoring device for hydrogen sulfide in pipeline natural gas includes the following steps:

[0043] S1. When the control valve 2 is in the normally open state, the gas in the pipeline enters the detection housing 3, the sealing device 4 is between the gas inlet and the detection hole, and the gas detector 7 is connected to the air chamber.

[0044] S2. When performing hydrogen sulfide detection, the pressure of the gas in the detection chamber is equal to the pressure of the production process and is higher than atmospheric pressure. It needs to be depressurized to reach normal pressure to meet the requirements of the detection conditions.

[0045] The programmable controller closes control valve 2, pressure transmitter 6 collects the pressure in the detection chamber, linear drive device 5 drives sealing device 4 upward, sealing device 4 moves between the detection hole and the vent, the detection chamber pressure and linear drive device 5 are interlocked, when the pressure reaches atmospheric pressure, about 0.1 MPa, linear drive device 5 stops moving, gas detector 7 enters the optimal working gas pressure, accurately measures the hydrogen sulfide content, and transmits it to the programmable controller to form a data curve.

[0046] S3. After the test is completed, the linear drive device 5 moves the sealing device 4 downward to compress the test chamber. When the sealing device 4 moves to its original position, the control valve 2 opens, and the gas in the pipeline connects with the test chamber. The gas in the test chamber returns to the production process.

[0047] This invention enables the gas detector 7 to operate within the optimal gas pressure range, allowing the gas detector 7 to remain in the air for extended periods, thus preventing aging of the detection probe, improving the accuracy of hydrogen sulfide detection values, and achieving remote automatic detection without affecting the health of operators.

[0048] Example 2:

[0049] Based on Example 1, combined with Figure 3 In this embodiment, the vent is connected to the venting dosing device 8, which includes a dosing pipe and an exhaust pipe. The dosing pipe is connected to the vent, and the exhaust pipe is connected to the dosing pipe. The dosing pipe is filled with hydrogen sulfide removal agent. The vent and the venting dosing device 8 connect the air chamber to the atmosphere.

[0050] Specifically, the dosing pipe is welded to the vent, and the exhaust pipe is connected to the dosing pipe by a thread. When the thread is unscrewed, hydrogen sulfide removal agent can be added. When the sealing device 4 moves downward, a small amount of hydrogen sulfide in the detection channel escapes into the air chamber. The hydrogen sulfide removal agent absorbs this part of the hydrogen sulfide, ensuring environmental safety.

[0051] In step S3, a small amount of residual hydrogen sulfide in the detection channel escapes into the air cavity and is absorbed by the hydrogen sulfide removal agent in the venting and dosing device 8.

[0052] Example 3:

[0053] Based on Example 1, this example provides a specific online monitoring device for hydrogen sulfide in pipeline natural gas.

[0054] The collection housing 1 is a cylinder made of 604 stainless steel, with a height of 100mm, a diameter of 80mm, and a wall thickness of 3mm. The electric push rod uses an explosion-proof motor. The piston is sealed to the collection housing 1 by a rubber seal. The piston is 10mm thick. The air guide hole is located at the bottom of the collection housing 1. The detection hole is located on the side wall of the collection housing 1. The distance between the detection hole and the bottom of the collection housing 1 is 36mm.

[0055] The detection housing is a cylinder made of 604 stainless steel, with a height of 60mm, a diameter of 60mm, and a wall thickness of 3mm.

[0056] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0057] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An online monitoring device for hydrogen sulfide in pipeline natural gas, comprising a detection housing, characterized in that, A linear drive device is provided at the upper end of the detection housing, and the output shaft of the linear drive device is connected to a sealing device inside the detection housing; The sealing device divides the detection housing into an air cavity and a detection cavity; The outer wall of the detection housing has an air vent in the air cavity, an air guide hole in the detection cavity, and a detection port in the outer wall of the detection housing. The detection port is connected to the air cavity or the detection cavity under the control of the sealing device.

2. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 1, characterized in that, The detection port is connected to the detection channel, the port of the detection channel is connected to the gas detector, and the probe of the gas detector is located in the detection channel.

3. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 2, characterized in that, The gas detector is a hydrogen sulfide gas detector, and the gas detector is equipped with a data display table.

4. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 2, characterized in that, The gas guide hole is connected to the collection housing, the lower end of the collection housing is connected to the control channel, the control channel is equipped with a control valve, the side wall of the collection housing is connected to the pressure channel, the port of the pressure channel is connected to the pressure transmitter, and the control channel is used to connect to the natural gas pipeline.

5. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 4, characterized in that, Both the detection housing and the acquisition housing are cylindrical metal structures.

6. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 4, characterized in that, A linear drive device is installed on the top of the detection housing. The output shaft of the linear drive device is inserted into the inside of the detection housing, and a sealing device is connected to the end of the output shaft of the linear drive device.

7. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 6, characterized in that, The sealing device is a piston, which seals against the inner wall of the detection housing. The linear drive device is an electric push rod, and the piston is connected to the push rod end of the electric push rod.

8. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 1, characterized in that, The vent is connected to the venting and dosing device, which includes a dosing pipe and an exhaust pipe. The dosing pipe is connected to the vent, and the exhaust pipe is connected to the dosing pipe. The dosing pipe is filled with a hydrogen sulfide removal agent.

9. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 7, characterized in that, The control valve is a solenoid valve.

10. The online monitoring device for hydrogen sulfide in pipeline natural gas according to claim 9, characterized in that, It also includes a programmable controller, which is electrically connected to a control valve, a linear drive, a pressure transmitter, and a gas detector.

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