Device for simultaneously measuring contents of hydrogen sulfide, carbon dioxide and water in natural gas

Abstract

The utility model discloses a device for simultaneously measuring the content of hydrogen sulfide, carbon dioxide and water in natural gas, which comprises a test bottom plate, a butt joint assembly, a reflection cavity, a gas inlet, a gas outlet, an explosion-proof cavity, a first laser generator, a second laser generator, a collimator and a detector PD, a rear end cover is arranged on the rear end support plate; a reflection cavity and an explosion-proof cavity are used as main measurement supporting structures, a carried first laser generator and a carried second laser generator are connected with a collimator to respectively emit laser to the reflection cavity, and the concentration of hydrogen sulfide, carbon dioxide and water molecules is subjected to inversion measurement according to detected light intensity change information. One set of equipment can complete comprehensive analysis of natural gas indexes, the overall structure is simple, and the technical feasibility is high; the collimator and the detector PD in the explosion-proof cavity can be conveniently maintained and overhauled through the butt joint assembly, the maintenance is simple, and the maintenance cost of the equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of natural gas detection technology, and in particular to a device for simultaneously measuring the content of hydrogen sulfide, carbon dioxide and water in natural gas. Background Technology

[0002] Natural gas is a fossil fuel mainly composed of methane, and usually also contains small amounts of ethane, propane, butane, as well as hydrogen sulfide and other impurities. It is one of the cleanest fossil fuels on Earth. According to the mandatory national standard GB17820-2018 "Natural Gas", there are clear requirements for the measurement of hydrogen sulfide, carbon dioxide and water content in natural gas. The measurement of these indicators is crucial to ensuring the safe use of natural gas, efficient energy utilization and environmental protection.

[0003] From the customer's perspective, natural gas pipeline operators and natural gas companies face considerable challenges in reducing the impact of hydrogen sulfide, carbon dioxide, and water content in natural gas on natural gas pipelines. Customers employ various technologies and utilize multiple devices to achieve comprehensive analysis of natural gas indicators; each gas requires a separate analyzer, operation and maintenance plan, and specialized operation, calibration, and maintenance skills, making the solutions complex, inefficient, and costly.

[0004] Regarding technology integration, some manufacturers in the industry are currently trying to integrate different technical solutions, such as integrating gas chromatographs, electrochemical sensors, and infrared sensors. By using software algorithms to fuse and calibrate the signals from various sensors, they can achieve rapid, accurate, and reliable measurement of H2S, CO2, and water content in natural gas. While these solutions are technically feasible, they cannot avoid problems such as complexity and low maintenance efficiency. Therefore, it is necessary to design a device that can simultaneously measure the hydrogen sulfide, carbon dioxide, and water content in natural gas. Utility Model Content

[0005] The purpose of this invention is to provide a device for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas. This device addresses the problem that existing measurement processes require separate analyzers, operation and maintenance plans, and specialized operation, calibration, and maintenance skills for each gas, resulting in complex, inefficient, and costly solutions. Furthermore, technology integration cannot avoid the problems of complex solutions and low maintenance efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a device for simultaneously measuring the hydrogen sulfide, carbon dioxide and water content in natural gas, comprising a test base plate, a docking assembly, a rear support plate, a rear cover, a reflective cavity, an air inlet, an air outlet, an inlet end cover, an explosion-proof cavity, a first laser generator, a second laser generator, a collimator, a mounting plate and a detector PD. The test base plate is provided with a rear support plate on one side of its top, and a rear cover is provided on the rear support plate. The rear cover is fixedly connected to one end of the reflective cavity by bolts, and an air inlet and an air outlet are respectively provided at both ends of the side wall of the reflective cavity. An inlet end cover is tightly pressed against the other end of the reflective cavity, and an explosion-proof cavity is provided on one side of the inlet end cover. A sliding frame from the docking assembly is provided at the bottom of the explosion-proof cavity. A connecting block is fixedly connected in the sliding frame, and the connecting block is connected to the sliding screw by an embedded ball nut. A release cylinder is evenly provided at one end of the side wall of the explosion-proof cavity, and a fixing frame is fixedly connected to the output end of the release cylinder. A clamping cylinder is sleeved in the fixing frame.

[0007] As a preferred technical solution, the docking assembly consists of a sliding frame, a connecting block, a sliding screw, a screw support, a guide rail, a slider, a handle, a release cylinder, a fixing frame, a clamping cylinder, and a clamping block. The sliding screw is rotatably connected to the screw support via a bearing, and the screw support is fixed to the top of the test base plate. A handle is fixedly sleeved at one end of the sliding screw.

[0008] As a preferred technical solution, a slider is fixedly connected to the bottom of the sliding frame, and the slider is slidably connected to the guide rail, which is fixed to the top of the test base plate.

[0009] As a preferred technical solution, a first laser generator and a second laser generator are respectively provided on the side wall of the reflective cavity.

[0010] As a preferred technical solution, both the first laser generator and the second laser generator are connected to the collimator, which is fixed to the mounting plate.

[0011] As a preferred technical solution, the mounting plate is fixed inside the explosion-proof cavity, and a detector PD is provided on the mounting plate.

[0012] As a preferred technical solution, the output end of the clamping cylinder is fixedly connected to a clamping block, which is pressed tightly into a groove evenly opened on one side of the inlet end cover.

[0013] This invention provides a device for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas. Its advantages include: through spectral analysis, a suitable laser LD1 band in the near-infrared range is selected for the laser absorption spectra of hydrogen sulfide and carbon dioxide, and a corresponding first laser generator is chosen based on the determined band; the absorption peaks of hydrogen sulfide and carbon dioxide are simultaneously covered within the laser scanning range, and combined with spectral analysis algorithms, the concentration inversion of hydrogen sulfide and carbon dioxide can be achieved; for the laser absorption spectra of water molecules, a suitable laser LD2 band in the near-infrared range is selected, and a corresponding second laser generator is chosen based on the determined band; the background gas interference problem is solved by combining spectral algorithms, achieving accurate water content measurement; the first and second laser generators intermittently emit light of specific wavelengths under the control of hardware circuits. After being focused and collimated by a collimator, the light enters the Heriot-Limiter cell. After several reflections, it is selectively absorbed by hydrogen sulfide, carbon dioxide, and water molecules along the optical path. The absorbed light enters the detector PD. When the first laser generator is working, the detected light intensity change information is used to process the data... The system achieves hydrogen sulfide and carbon dioxide concentration inversion. When the second laser generator is working, it uses the detected light intensity change information to achieve water molecule concentration inversion through data processing. The entire device uses a reflective cavity and an explosion-proof cavity as the main measurement support structure. The first and second laser generators are connected to collimators and emit lasers into the reflective cavity. Based on the detected light intensity change information, the concentrations of hydrogen sulfide, carbon dioxide, and water molecules are inverted and measured. One set of equipment can complete the comprehensive analysis of natural gas indicators. At the same time, the overall structure is simple and the technology is highly feasible. The sliding frame is supported by a slider and limited by a guide rail. The clamping cylinder moves the clamping block away from the groove on the inlet end cover. At the same time, the disengagement cylinder moves the fixing frame and the clamping cylinder away from the reflective cavity, thus releasing the fixation of the inlet end cover and the explosion-proof cavity. Then, turning the handle moves the inlet end cover and the explosion-proof cavity away from the reflective cavity through the ball nut embedded in the sliding screw and the connecting block. This allows for maintenance and repair of the collimator and detector PD in the explosion-proof cavity. The maintenance is simple and reduces the maintenance cost of the equipment. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional view of the overall structure of this utility model;

[0016] Figure 2 for Figure 1 A partial enlarged view of area A in the middle;

[0017] Figure 3 This is a schematic diagram showing the installation positions of the collimator and detector PD in this utility model;

[0018] Figure 4 This is a schematic diagram illustrating the measurement principle of this utility model.

[0019] In the diagram: 1. Test base plate; 2. Docking assembly; 3. Rear end support plate; 4. Rear end cover; 5. Reflecting cavity; 6. Air inlet; 7. Air outlet; 8. Inlet end cover; 9. Explosion-proof cavity; 10. First laser generator; 11. Second laser generator; 12. Collimator; 13. Mounting plate; 14. Detector (PD); 21. Sliding frame; 22. Connecting block; 23. Sliding screw; 24. Screw support; 25. Guide rail; 26. Slider; 27. Handle; 28. Disengagement cylinder; 29. ​​Fixing frame; 30. Clamping cylinder; 31. Clamping block. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see the appendix Figure 1 -Attached Figure 4This utility model provides an embodiment of a device for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas. The device includes a test base plate 1, a docking assembly 2, a rear support plate 3, a rear cover 4, a reflective cavity 5, an air inlet 6, an air outlet 7, an inlet end cover 8, an explosion-proof cavity 9, a first laser generator 10, a second laser generator 11, a collimator 12, a mounting plate 13, and a detector PD14. The rear support plate 3 is located on one side of the top of the test base plate 1, and the rear cover 4 is mounted on the rear support plate 3. The rear cover 4 is bolted to one end of the reflective cavity 5, and the two ends of the sidewall of the reflective cavity 5 are respectively provided with an air inlet 6 and an air outlet 7. The other end of the reflective cavity 5 is tightly pressed against the inlet end cover 8, and an explosion-proof cavity 9 is located on one side of the inlet end cover 8. A sliding frame 21 from the docking assembly 2 is located at the bottom of the explosion-proof cavity 9, and the sliding frame 21 is fixedly connected to... A connecting block 22 is attached, and the connecting block 22 is connected to the sliding screw 23 by an embedded ball nut. A release cylinder 28 is evenly arranged at one end of the side wall of the explosion-proof cavity 9. A fixed frame 29 is fixedly connected to the output end of the release cylinder 28. A clamping cylinder 30 is sleeved in the fixed frame 29. The docking assembly 2 consists of a sliding frame 21, a connecting block 22, a sliding screw 23, a screw support 24, a guide rail 25, a slider 26, a handle 27, a release cylinder 28, a fixed frame 29, a clamping cylinder 30, and a clamping block 31. The sliding screw 23 is rotatably connected to the screw support 24 by a bearing, and the screw support 24 is fixed to the top of the test base plate 1. A handle 27 is fixedly sleeved at one end of the sliding screw 23. A slider 26 is fixedly connected to the bottom of the sliding frame 21, and the slider 26 is slidably connected to the guide rail 25. The guide rail 25 is fixed to the top of the test base plate 1.

[0023] A first laser generator 10 and a second laser generator 11 are respectively installed on the side wall of the reflective cavity 5; the first laser generator 10 and the second laser generator 11 are both connected to the collimator 12, and the collimator 12 is fixed on the mounting plate 13; the mounting plate 13 is fixed inside the explosion-proof cavity 9, and a detector PD14 is installed on the mounting plate 13; a pressing block 31 is fixedly connected to the output end of the pressing cylinder 30, and the pressing block 31 is pressed tightly into the grooves evenly opened on one side of the inlet end cover 8; the pressing block 31 can press the inlet end cover 8 tightly onto one side of the reflective cavity 5 to achieve the sealing of the equipment.

[0024] Specifically, in use, through spectral studies, a suitable laser LD1 band in the near-infrared range is selected for the laser absorption spectra of hydrogen sulfide and carbon dioxide, and the corresponding first laser generator 10 is selected according to the determined band. The absorption peaks of hydrogen sulfide and carbon dioxide are simultaneously covered within the laser scanning range. Combined with spectral analysis algorithms, the concentration inversion of hydrogen sulfide and carbon dioxide can be achieved. For the laser absorption spectra of water molecules, a suitable laser LD2 band in the near-infrared range is selected, and the corresponding second laser generator 11 is selected according to the determined band. The background gas interference problem is solved by combining spectral algorithms to achieve accurate measurement of water content. Under the control of hardware circuits, the first laser generator 10 and the second laser generator 11 intermittently emit light of specific wavelengths. After being focused and collimated by the collimator 12, the light enters the Heriot-Lewis cell. After several reflections, it is selectively absorbed by hydrogen sulfide, carbon dioxide, and water molecules on the optical path. The absorbed light enters the detector PD14. When the first laser generator 10 is working, the detected light intensity change information is used to process the data to achieve the inversion of hydrogen sulfide and carbon dioxide concentrations.

[0025] When the second laser generator 11 is working, the detected light intensity change information is used to process the data to realize the inversion of water molecule concentration. The entire device uses the reflective cavity 5 and the explosion-proof cavity 9 as the main measurement support structure. The first laser generator 10 and the second laser generator 11 are connected to the collimator 12 to emit lasers into the reflective cavity 5 respectively. Based on the detected light intensity change information, the concentrations of hydrogen sulfide, carbon dioxide, and water molecules are inverted and measured. One set of equipment can complete the comprehensive analysis of natural gas indicators. At the same time, the overall structure is simple and the technology is highly feasible. The sliding frame 21 is adjusted by the slider 26. The device is supported and limited by guide rail 25. The clamping cylinder 30 moves the clamping block 31 away from the groove on the inlet end cover 8. At the same time, the disengagement cylinder 28 moves the fixing frame 29 and the clamping cylinder 30 away from the reflector cavity 5, thereby releasing the fixation of the inlet end cover 8 and the explosion-proof cavity 9. Then, by turning the handle 27, the ball nut embedded in the connecting block 22 through the sliding screw 23 can be used to move the inlet end cover 8 and the explosion-proof cavity 9 away from the reflector cavity 5, so that the collimator 12 and the detector PD14 in the explosion-proof cavity 9 can be maintained and repaired. The maintenance is simple and reduces the maintenance cost of the equipment.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas, comprising a test base plate (1), a docking assembly (2), a rear support plate (3), a rear cover (4), a reflective cavity (5), an inlet (6), an outlet (7), an inlet end cover (8), an explosion-proof cavity (9), a first laser generator (10), a second laser generator (11), a collimator (12), a mounting plate (13), and a detector PD (14), characterized in that: The test base plate (1) has a rear support plate (3) on one side of its top. A rear cover (4) is provided on the rear support plate (3). The rear cover (4) is fixedly connected to one end of the reflective cavity (5) by bolts. An air inlet (6) and an air outlet (7) are respectively provided at both ends of the side wall of the reflective cavity (5). An inlet end cover (8) is tightly pressed against the other end of the reflective cavity (5). An explosion-proof cavity (9) is provided on one side of the inlet end cover (8). The bottom of the 9) is provided with a sliding frame (21) in the docking assembly (2). A connecting block (22) is fixedly connected in the sliding frame (21), and the connecting block (22) is connected to the sliding screw (23) by an embedded ball nut. A release cylinder (28) is evenly provided at one end of the side wall of the explosion-proof cavity (9). A fixing frame (29) is fixedly connected to the output end of the release cylinder (28), and a pressing cylinder (30) is sleeved in the fixing frame (29).

2. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 1, characterized in that: The docking assembly (2) includes a sliding frame (21), a connecting block (22), a sliding screw (23), a screw support (24), a guide rail (25), a slider (26), a handle (27), a disengagement cylinder (28), a fixing frame (29), a clamping cylinder (30), and a clamping block (31). The sliding screw (23) is rotatably connected to the screw support (24) via a bearing, and the screw support (24) is fixed to the top of the test base plate (1). One end of the sliding screw (23) is fixedly sleeved with a handle (27).

3. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 2, characterized in that: The bottom of the sliding frame (21) is fixedly connected to a slider (26), and the slider (26) is slidably connected to the guide rail (25), which is fixed to the top of the test base plate (1).

4. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 1, characterized in that: The sidewall of the reflective cavity (5) is provided with a first laser generator (10) and a second laser generator (11).

5. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 4, characterized in that: The first laser generator (10) and the second laser generator (11) are both connected to the collimator (12), which is fixed on the mounting plate (13).

6. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 5, characterized in that: The mounting plate (13) is fixed inside the explosion-proof cavity (9), and a detector PD (14) is provided on the mounting plate (13).

7. The apparatus for simultaneously measuring the hydrogen sulfide, carbon dioxide, and water content in natural gas according to claim 1, characterized in that: The output end of the clamping cylinder (30) is fixedly connected to a clamping block (31), which is pressed tightly into a groove evenly opened on one side of the inlet end cover (8).

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