A gas detection device for natural gas purification

Abstract

The present application belongs to the technical field of gas detection, and particularly relates to a gas detection device for natural gas purification, which comprises a rectangular shell and a controller installed on the top of the rectangular shell, one side of the rectangular shell is provided with an air inlet pipe, the bottom of the rectangular shell is communicated with an air outlet assembly, and the device is characterized in that it further comprises a guide plate which is fixed at one end of the rectangular shell away from the air inlet pipe, and a wave-shaped guide hole is formed in the side wall of the guide plate. The present application can effectively weaken the stratification phenomenon of pipeline airflow, improve the sampling representativeness and the accuracy of gas quality detection, and can stabilize the air inlet pressure, flow and flow rate, avoid the interference of airflow fluctuation on the detection accuracy, and based on the pre-detection result of the natural gas by the sensor combination, the sampling action is self-adaptively adjusted, the equipment operation loss and energy consumption are reduced, the abnormal working conditions of gas quality are comprehensively captured, and the detection reliability and the equipment service life are improved.

Description

Technical Field

[0001] This invention belongs to the field of gas detection technology, and in particular relates to a gas detection device for natural gas purification. Background Technology

[0002] Natural gas purification devices are affected by factors such as load fluctuations, amine foaming, molecular sieve adsorption attenuation, and partial blockage of filter units. As a result, purified natural gas may still contain impurities such as moisture, hydrogen sulfide, solid particles, and heavy hydrocarbons, which can easily corrode pipelines, generate hydrates that block pipelines, and affect the calorific value and safety of gas supply. Therefore, it is necessary to monitor the purified natural gas online.

[0003] Online detection instruments, such as hydrogen sulfide analyzers and water dew point meters, are commonly used in natural gas purification. They bypass the natural gas pipeline by drawing a small amount of sample gas from a fixed point on the side wall and then introduce the natural gas into the detection chamber for continuous online detection of the purified gas quality. However, due to factors such as gas velocity gradient, medium density differences, and natural gas pressure fluctuations within the pipeline, phenomena such as stratification and local stagnation of the gas flow may occur inside the pipeline. Water vapor, particulate matter, and harmful impurities are unevenly distributed radially and circumferentially in the pipeline. Since the detection instruments draw gas from the side wall of the natural gas pipeline by bypass, they can only obtain a gas sample from a single location, resulting in poor sample representativeness and easy deviation in the detection results. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a gas detection device for natural gas purification.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas detection device for natural gas purification, comprising a rectangular housing and a controller mounted on the top of the rectangular housing, wherein an inlet pipe is provided on one side of the rectangular housing, and an exhaust assembly is connected to the bottom of the rectangular housing, characterized in that it further comprises:

[0006] A guide plate is fixed to the end of the rectangular housing away from the air intake pipe. The side wall of the guide plate is provided with a wavy guide hole. A mounting box is fixed to the side wall of the guide plate away from the rectangular housing.

[0007] A sampling tube is disposed inside the mounting box, and the air inlet end of the sampling tube extends into the interior of the rectangular housing. The mounting box is equipped with a drive unit that drives the sampling tube to move along the wavy guide hole.

[0008] A natural gas detection unit is installed on the outer wall of the installation box and is connected to the sampling tube;

[0009] A flow equalization unit is disposed between the intake pipe and the rectangular housing. The flow equalization unit is used to introduce the natural gas entering through the intake pipe into the interior of the rectangular housing.

[0010] In the aforementioned gas detection device for natural gas purification, the exhaust assembly includes an exhaust hood fixedly inserted into the bottom of a rectangular housing near the guide plate, and the exhaust hood is connected to the interior of the rectangular housing. A main exhaust pipe is fixedly inserted into the side wall of the exhaust hood.

[0011] In the aforementioned gas detection device for natural gas purification, the drive unit includes a frame plate slidably disposed inside the mounting box. A square sleeve is fixedly fitted onto the wall of the sampling tube, and the square sleeve slides vertically along the inside of the frame plate. A linear reciprocating driver is installed inside the mounting box, and the drive end of the linear reciprocating driver is fixedly connected to the top of the frame plate. The linear reciprocating driver drives the frame plate to move longitudinally along the inside of the mounting box. The linear reciprocating driver is electrically connected to the controller.

[0012] In the aforementioned gas detection device for natural gas purification, the sampling tube is rotatably sleeved with a guide sleeve, and the guide sleeve makes rolling contact with the wall of the corrugated guide hole.

[0013] In the aforementioned gas detection device for natural gas purification, the natural gas detection unit includes a flexible hose fixedly inserted into the side wall of the installation box, and the flexible hose is fixedly connected to the sampling tube. A bypass exhaust pipe is provided on the outside of the installation box. At least a hydrogen sulfide analyzer and a water dew point meter are installed in the wall of the bypass exhaust pipe. The bypass exhaust pipe is connected to the main exhaust pipe and the flexible hose.

[0014] In the aforementioned gas detection device for natural gas purification, an extraction box is fixed to the side wall of the mounting box, and an explosion-proof negative pressure fan is installed inside the extraction box. The explosion-proof negative pressure fan is electrically connected to the controller, and the bypass exhaust pipe is connected to a flexible hose through the extraction box.

[0015] In the above-mentioned gas detection device for natural gas purification, the flow equalization unit includes a flow equalization shell fixedly installed at the end of a rectangular shell, and a flow equalization orifice plate is fixedly installed inside the flow equalization shell. A flow equalization pipe is fixedly connected to the end of the flow equalization shell away from the rectangular shell. An explosion-proof fan electrically connected to the controller is installed inside the flow equalization pipe. An air inlet box is fixedly connected to the end of the flow equalization pipe away from the flow equalization shell, and the air inlet pipe is connected to the air inlet box.

[0016] In the aforementioned gas detection device for natural gas purification, a pressure sensor and a turbidity sensor are fixedly connected to the top of the air inlet box. After receiving the electrical signal fed back by the pressure sensor or the turbidity sensor, the controller controls the linear reciprocating driver to work.

[0017] Compared with existing technologies, the advantages of a gas detection device for natural gas purification are:

[0018] 1. By cooperating with the rectangular shell and the inlet pipe, a traditional circular gas pipeline can be introduced into the rectangular shell. The change in the shape of the gas pipeline and the flat structure of the rectangular shell can change the airflow cross section and weaken the airflow stratification phenomenon caused by the pipe wall boundary layer. At the same time, with the help of the guide plate, the corrugated guide hole, the mounting box, the sampling tube and the drive unit, the sampling tube can move dynamically along the corrugated guide hole, so that multi-point dynamic sampling can be carried out from different positions. Finally, the natural gas is tested by the natural gas detection unit, which effectively improves the representativeness of the sampling and the accuracy of the test results, and truly reflects the overall quality of the natural gas after purification.

[0019] 2. By using the flow equalization unit, the turbulent airflow can be buffered, stabilized, and made uniform at the detection inlet, forming a stable laminar flow state. This ensures that the gas pressure, flow rate, and velocity entering the rectangular shell remain balanced and stable, avoiding the impact of airflow fluctuations on the sampling tube and indirectly improving the detection accuracy of the detection unit.

[0020] 3. By setting up pressure sensors and turbidity sensors, natural gas can be pre-tested at the natural gas inlet. If the pre-test results are stable enough, unnecessary dynamic movement of the sampling tube can be reduced, thereby reducing the loss and energy consumption of the reciprocating operation of the mechanism and simplifying the sampling process. If the pre-test results are not good, the sampling tube can resume continuous dynamic sampling to ensure comprehensive capture of abnormal gas and gas conditions and improve the integrity of sampling and the reliability of detection. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a gas detection device for natural gas purification provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the back structure of a gas detection device for natural gas purification provided by the present invention;

[0023] Figure 3 This is a side view of the guide plate of a gas detection device for natural gas purification provided by the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of a rectangular housing of a gas detection device for natural gas purification provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the installation box of a gas detection device for natural gas purification provided by the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the extraction box of a gas detection device for natural gas purification provided by the present invention;

[0027] Figure 7 This is a schematic diagram of the flow equalization unit of a gas detection device for natural gas purification provided by the present invention;

[0028] Figure 8 This is a schematic diagram of the internal structure of the flow equalization shell of a gas detection device for natural gas purification provided by the present invention.

[0029] In the diagram: 1 Rectangular housing, 2 Controller, 3 Inlet pipe, 4 Exhaust assembly, 41 Exhaust hood, 42 Main exhaust pipe, 5 Guide plate, 6 Corrugated guide hole, 7 Mounting box, 8 Sampling tube, 9 Drive unit, 91 Frame plate, 92 Square sleeve, 93 Linear reciprocating driver, 10 Natural gas detection unit, 101 Hoses, 102 Bypass exhaust pipe, 103 Hydrogen sulfide analyzer, 104 Water dew point meter, 11 Flow equalization unit, 111 Flow equalization shell, 112 Flow equalization orifice plate, 113 Flow equalization pipe, 114 Explosion-proof fan, 115 Inlet box, 12 Guide sleeve, 13 Extraction box, 14 Explosion-proof negative pressure fan, 15 Pressure sensor, 16 Turbidity sensor. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] like Figures 1-8 As shown, a gas detection device for natural gas purification includes a rectangular housing 1 and a controller 2 installed on the top of the rectangular housing 1. An inlet pipe 3 is provided on one side of the rectangular housing 1, and an exhaust assembly 4 is connected to the bottom of the rectangular housing 1. The exhaust assembly 4 includes an exhaust hood 41 fixedly inserted into the bottom of the rectangular housing 1 near the guide plate 5, and the exhaust hood 41 is connected to the interior of the rectangular housing 1. A main exhaust pipe 42 is fixedly inserted into the side wall of the exhaust hood 41. Natural gas inside the rectangular housing 1 can be discharged through the exhaust hood 41 and the main exhaust pipe 42. The main exhaust pipe 42 is connected in series with an external natural gas transmission pipeline. A branch pipeline can be installed on the main exhaust pipe 42. Valves are installed in both the branch pipeline and the main exhaust pipe 42. When the natural gas purification effect is detected to be poor, the natural gas can be led back upstream of the natural gas purification device through the branch pipeline, thus preventing poorly purified natural gas from flowing out.

[0032] A guide plate 5 is fixed to the end of the rectangular housing 1 away from the air inlet pipe 3. A wavy guide hole 6 is provided on the side wall of the guide plate 5. A mounting box 7 is fixed to the side wall of the guide plate 5 away from the rectangular housing 1. A sampling tube 8 is located inside the mounting box 7, and the air inlet end of the sampling tube 8 extends into the interior of the rectangular housing 1. The mounting box 7 is equipped with a drive unit 9 that drives the sampling tube 8 to move along the wavy guide hole 6. The drive unit 9 includes a frame plate 91 that is slidably disposed inside the mounting box 7. A square sleeve 92 is fixedly sleeved on the wall of the sampling tube 8, and the square sleeve 92 slides vertically along the interior of the frame plate 91. The mounting box 7 contains a linear reciprocating driver 93, and the drive end of the linear reciprocating driver 93 is fixedly connected to the top of the frame plate 91. The linear reciprocating driver 93 drives the frame plate 91 to move longitudinally along the inside of the mounting box 7. The linear reciprocating driver 93 is electrically connected to the controller 2. The linear reciprocating driver 93 includes components such as a reciprocating screw, a screw nut, a bearing, a motor, and a sealed housing. The motor drives the reciprocating screw to rotate, causing the screw nut to move back and forth along the reciprocating screw. The frame plate 91 is installed on the lower side of the screw nut. This is a mature existing technology and will not be described in detail here.

[0033] The sampling tube 8 is rotatably sleeved with a guide sleeve 12, and the guide sleeve 12 makes rolling contact with the wall of the wavy guide hole 6. The guide sleeve 12 can reduce the mutual wear between the sampling tube 8 and the wavy guide hole 6 when the tube moves.

[0034] The natural gas detection unit 10 is installed on the outer wall of the installation box 7 and is connected to the sampling tube 8. The natural gas detection unit 10 includes a flexible hose 101 fixedly inserted into the side wall of the installation box 7 and the flexible hose 101 is fixedly connected to the sampling tube 8. A bypass exhaust pipe 102 is provided on the outside of the installation box 7. At least a hydrogen sulfide analyzer 103 and a water dew point meter 104 are installed in the wall of the bypass exhaust pipe 102. The bypass exhaust pipe 102 is connected to the main exhaust pipe 42 and the flexible hose 101. The setting of the flexible hose 101 can ensure that it will not affect the normal movement of the sampling tube 8. The hydrogen sulfide analyzer 103 can detect the concentration of hydrogen sulfide in the natural gas, and the water dew point meter 104 can monitor the moisture content in the natural gas and the risk of pipeline hydrate formation.

[0035] A vacuum box 13 is fixed to the side wall of the mounting box 7, and an explosion-proof negative pressure fan 14 is installed inside the vacuum box 13. The explosion-proof negative pressure fan 14 is electrically connected to the controller 2. The bypass exhaust pipe 102 is connected to the hose 101 through the vacuum box 13. When the explosion-proof negative pressure fan 14 is working, it can generate negative pressure suction at the sampling pipe 8 through the vacuum box 13 and the hose 101, ensuring that natural gas is stably drawn into the bypass exhaust pipe 102, and avoiding the situation where the dynamic movement of the sampling pipe 8 affects the stability of natural gas entering.

[0036] The flow equalization unit 11 is disposed between the air inlet pipe 3 and the rectangular shell 1. The flow equalization unit 11 is used to introduce the natural gas entering through the air inlet pipe 3 into the interior of the rectangular shell 1. The flow equalization unit 11 includes a flow equalization shell 111 fixedly installed at the end of the rectangular shell 1, and a flow equalization orifice plate 112 is fixedly installed inside the flow equalization shell 111. A flow equalization pipe 113 is fixedly connected to the end of the flow equalization shell 111 away from the rectangular shell 1. An explosion-proof fan 114 electrically connected to the controller 2 is installed inside the flow equalization pipe 113. An air inlet box 115 is fixedly connected to the end of the flow equalization pipe 113 away from the flow equalization shell 111, and the air inlet pipe 3 is connected to the air inlet box 115. Since the natural gas output by the purification device may have pressure fluctuations, flow rate fluctuations, and velocity fluctuations, by pre-entering the natural gas into the air inlet box 115 and having the explosion-proof fan 114 extract the natural gas at a stable speed, the stability of the flow rate, velocity, and pressure of the natural gas entering the rectangular shell 1 can be ensured as much as possible.

[0037] A pressure sensor 15 and a turbidity sensor 16 are fixedly connected to the top of the air intake box 115. After receiving the electrical signal from the pressure sensor 15 or the turbidity sensor 16, the controller 2 controls the linear reciprocating driver 93 to work. The pressure sensor 15 can detect abnormal fluctuations in the natural gas pressure in the air intake box 115, while the turbidity sensor 16 can monitor the solid particles, droplets and other impurities carried in the natural gas in the air intake box 115. By detecting abnormal fluctuations in the natural gas pressure and abnormal changes in turbidity, abnormal conditions in natural gas purification can be detected in a timely manner. At this time, continuous sampling by the sampling tube 8 can ensure the timeliness of sampling abnormal natural gas. Under normal operating conditions, reducing the movement frequency of the sampling tube 8 can reduce equipment wear and energy consumption.

[0038] The operating principle of the present invention is explained as follows: The inlet pipe 3 is connected to the outlet pipe of the natural gas purification device. The purified natural gas enters the inlet box 115 through the inlet pipe 3. Then, the explosion-proof fan 114 smoothly extracts the natural gas from the inlet box 115 at a constant speed and delivers it to the flow equalization shell 111. The flow equalization plate 112 evenly distributes the airflow, reducing airflow pulsation and velocity differences. Finally, the purified natural gas enters the rectangular shell 1 through the flow equalization plate 112, thereby ensuring that the airflow entering the rectangular shell 1 maintains a stable flow rate and velocity, and avoiding the impact of fluctuations in natural gas flow rate, velocity, pressure, etc., caused by blockage or other reasons on the detection.

[0039] Most of the natural gas entering the rectangular casing 1 is discharged from the main exhaust pipe 42 through the exhaust hood 41, while a small portion enters the sampling pipe 8. The explosion-proof negative pressure fan 14 operates, extracting the natural gas from the sampling pipe 8 through the extraction box 13 and hose 101, and sending it into the bypass exhaust pipe 102. The natural gas entering the bypass exhaust pipe 102 passes through the detection chambers of various detection instruments in the natural gas detection unit 10 and finally flows into the main exhaust pipe 42 for discharge. The detection instruments can then perform tests on the natural gas. For example, the hydrogen sulfide analyzer 103 detects the sulfide content in the natural gas using the optical absorption principle, thereby determining whether harmful impurities exceed the standard. The water dew point meter 104 detects the gas dew point temperature using the condensation temperature measurement principle, thereby determining the moisture content of the natural gas and the risk of hydrate formation in the pipeline. (The detection instruments in the natural gas detection unit 10 are not limited to the hydrogen sulfide analyzer 103 and the water dew point meter 104; other instruments can be selected according to actual detection needs, such as a natural gas component chromatography analyzer and a calorific value analyzer.)

[0040] During operation, the controller 2 controls the linear reciprocating driver 93 to work in a timed manner according to its own time module. The linear reciprocating driver 93 drives the frame plate 91 to move longitudinally along the mounting box 7. The frame plate 91 will drive the sampling tube 8 to move longitudinally synchronously through the square sleeve 92. The sampling tube 8 can move vertically along the frame plate 91 through the square sleeve 92. Therefore, under the action of the longitudinal movement of the frame plate 91, the sampling tube 8 will move along the wavy guide hole 6, so that the sampling tube 8 can circulate and collect gas at multiple positions in the rectangular shell 1, ensuring that representative gas samples from different flow field areas are collected and avoiding detection deviations caused by fixed single-point sampling.

[0041] Secondly, during operation, the natural gas purification device may experience reduced purification efficiency due to factors such as load fluctuations, adsorption material attenuation, amine foaming, and filter component blockage. Consequently, the pressure and turbidity of the natural gas entering the inlet chamber 115 will also change. The pressure sensor 15 can monitor these pressure fluctuations in real time. When the pressure exceeds a preset normal threshold, the pressure sensor 15 sends an electrical signal to the controller 2. The turbidity sensor 16, using laser scattering detection, can detect solid particulate impurities in the gas. When the detected concentration exceeds a preset concentration threshold, the turbidity sensor 16 also sends an electrical signal to the controller 2. When the controller 2 receives a signal from the pressure sensor 15... After receiving an electrical signal from pressure sensor 15 or turbidity sensor 16, controller 2 will synchronously control linear reciprocating drive 93 to work continuously. This ensures sufficient natural gas sampling when natural gas purification is substandard or gas quality fluctuates abnormally, ensuring that natural gas detection unit 10 can detect potential problems such as excessive impurities and abnormal moisture levels in a timely manner. When pressure sensor 15 and turbidity sensor 16 do not provide electrical signals, controller 2 will start linear reciprocating drive 93 according to its own time module. For example, it will move sampling tube 8 back and forth once every 10 minutes to reduce unnecessary movement of sampling tube 8, reduce mechanical wear and energy consumption, extend equipment service life, and maintain normal stable online detection.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas detection device for natural gas purification, comprising a rectangular housing (1) and a controller (2) mounted on the top of the rectangular housing (1), wherein an inlet pipe (3) is provided on one side of the rectangular housing (1), and an exhaust assembly (4) is connected to the bottom of the rectangular housing (1), characterized in that, Also includes: A guide plate (5) is fixed at one end of the rectangular housing (1) away from the air intake pipe (3). A wavy guide hole (6) is provided on the side wall of the guide plate (5). A mounting box (7) is fixed on the side wall of the guide plate (5) away from the rectangular housing (1). The sampling tube (8) is located inside the mounting box (7), and the air inlet end of the sampling tube (8) extends into the interior of the rectangular housing (1). The mounting box (7) is equipped with a drive unit (9) that drives the sampling tube (8) to move along the wavy guide hole (6). The natural gas detection unit (10) is installed on the outer wall of the installation box (7) and is connected to the sampling tube (8); A flow equalization unit (11) is disposed between the air inlet pipe (3) and the rectangular shell (1). The flow equalization unit (11) is used to introduce the natural gas entering through the air inlet pipe (3) into the interior of the rectangular shell (1).

2. The gas detection device for natural gas purification according to claim 1, characterized in that, The exhaust assembly (4) includes an exhaust hood (41) fixedly inserted into the bottom of the rectangular housing (1) near the guide plate (5), and the exhaust hood (41) is connected to the interior of the rectangular housing (1). The main exhaust pipe (42) is fixedly inserted into the side wall of the exhaust hood (41).

3. A gas detection device for natural gas purification according to claim 1, characterized in that, The drive unit (9) includes a frame plate (91) slidably disposed inside the mounting box (7), a square sleeve (92) is fixedly sleeved on the wall of the sampling tube (8), and the square sleeve (92) slides vertically along the inside of the frame plate (91). A linear reciprocating driver (93) is installed inside the mounting box (7), and the drive end of the linear reciprocating driver (93) is fixedly connected to the top of the frame plate (91). The linear reciprocating driver (93) drives the frame plate (91) to move longitudinally along the inside of the mounting box (7). The linear reciprocating driver (93) is electrically connected to the controller (2).

4. A gas detection device for natural gas purification according to claim 1, characterized in that, The sampling tube (8) is rotatably sleeved with a guide sleeve (12), and the guide sleeve (12) makes rolling contact with the wall of the wavy guide hole (6).

5. A gas detection device for natural gas purification according to claim 2, characterized in that, The natural gas detection unit (10) includes a hose (101) fixedly inserted into the side wall of the installation box (7), and the hose (101) is fixedly connected to the sampling tube (8). A bypass exhaust pipe (102) is provided on the outside of the installation box (7). At least a hydrogen sulfide analyzer (103) and a water dew point meter (104) are installed on the wall of the bypass exhaust pipe (102). The bypass exhaust pipe (102) is connected to the main exhaust pipe (42) and the hose (101).

6. A gas detection device for natural gas purification according to claim 5, characterized in that, The side wall of the mounting box (7) is fixed with an air extraction box (13), and an explosion-proof negative pressure fan (14) is installed inside the air extraction box (13). The explosion-proof negative pressure fan (14) is electrically connected to the controller (2), and the bypass exhaust pipe (102) is connected to the hose (101) through the air extraction box (13).

7. A gas detection device for natural gas purification according to claim 1, characterized in that, The flow equalization unit (11) includes a flow equalization shell (111) fixedly installed at the end of a rectangular shell (1), and a flow equalization orifice plate (112) is fixed inside the flow equalization shell (111). A flow equalization pipe (113) is fixedly connected to one end of the flow equalization shell (111) away from the rectangular shell (1). An explosion-proof fan (114) electrically connected to the controller (2) is installed inside the flow equalization pipe (113). An air inlet box (115) is fixedly connected to one end of the flow equalization pipe (113) away from the flow equalization shell (111), and the air inlet pipe (3) is connected to the air inlet box (115).

8. A gas detection device for natural gas purification according to claim 7, characterized in that, A pressure sensor (15) and a turbidity sensor (16) are fixedly connected to the top of the air intake box (115). After receiving the electrical signal fed back by the pressure sensor (15) or the turbidity sensor (16), the controller (2) controls the linear reciprocating driver (93) to work.

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