Detection device for sulfide in natural gas

Abstract

The invention discloses a device for detecting sulfides in natural gas, and aims to solve the technical problems of difficulty in quantitative collection and high-efficiency detection at present, the device structurally comprises a natural gas pipeline, and positioning rings are fixedly mounted on two sides of the natural gas pipeline. By driving a negative pressure pump in the gas collecting mechanism, natural gas staying in the natural gas pipeline can be guided into the balloon, after the balloon is continuously expanded and the air pressure value in the balloon reaches a set value of an air pressure sensor, driving of the negative pressure pump can be stopped, and a motor in the extrusion mechanism is started; when the two-way screw rod synchronously drives the two groups of moving blocks to move towards the inner side, the two groups of moving blocks drive the two groups of extrusion plates to continuously extrude the balloon, quantitative natural gas collected in the balloon is extruded into a detection cavity in the top of the gas chromatograph, and high-precision detection is performed through a flame photometric detector; the process does not need manual sampling, and natural gas is quantitatively collected and detected.

Description

Technical Field

[0001] The invention relates to the technical field of sulfide detection in natural gas, and in particular to a device for detecting sulfide in natural gas. Background Art

[0002] At present, natural gas is a mixed gas mainly composed of methane. It is a combustible gas resource formed underground and usually exists in underground oil and gas fields together with petroleum. Natural gas is a clean and energy-efficient energy source and is widely used in heating, power generation, industrial production, transportation and other fields.

[0003] Among them, when natural gas is in use, in order to avoid safety hazards caused by sulfide detection exceeding the standard in natural gas, it is necessary to detect the sulfide in natural gas. Most of the existing detection methods are to put the natural gas in a detection bag, and then place the probe of the detection device in the detection bag for detection.

[0004] This detection method not only requires the operator to take time and effort to collect samples, but also during the sampling process, outside air can easily be introduced into the test bag, greatly affecting the detection accuracy. Therefore, it is necessary to design a new technical solution to automatically collect natural gas quantitatively and introduce it into the gas chromatograph for high-precision detection. Summary of the invention

[0005] The purpose of the present invention is to provide a detection device for sulfide in natural gas to solve the current technical problem of difficulty in quantitative collection and high-efficiency detection.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting sulfide in natural gas, comprising a natural gas pipeline, positioning rings are fixedly installed on both sides of the natural gas pipeline, mounting frames are fixedly installed on the bottoms of two groups of positioning rings, and detection boxes are fixedly installed on the bottoms of two groups of mounting frames by bolts, a negative pressure tube is installed on one end of the top of the detection box, and a gas collection mechanism is installed on one end of the negative pressure tube, through which the natural gas inside the natural gas pipeline can be quantitatively collected into the balloon, so as to facilitate the gas chromatograph to detect the natural gas;

[0007] A driving seat is fixedly mounted on the inner side wall of the detection box, and an extrusion mechanism is installed in the driving seat. The balloon can be squeezed by the extrusion mechanism to squeeze the quantitative natural gas inside the balloon into the gas chromatograph to detect the collected natural gas.

[0008] As a preferred embodiment of the present invention, the gas collection mechanism includes a negative pressure pump fixedly installed on one side of the inner wall of the detection box, a negative pressure tube connected and installed at the negative pressure end of the negative pressure pump, a gas pipe connected and installed at the negative pressure pump outlet port, a balloon connected and installed at the other end of the gas pipe, an air pressure sensor connected and installed at one end of the balloon, a detection tube connected and installed at the bottom of the balloon, and a gas chromatograph connected and installed at the other end of the detection tube, a flame photometer is installed inside the gas chromatograph, the other end of the negative pressure tube is connected and installed with a natural gas pipeline, and a first solenoid valve is installed at one end of the negative pressure tube, the gas pipe and the detection tube.

[0009] As a preferred embodiment of the present invention, the extrusion mechanism includes a motor fixedly installed in the middle of the side wall of the drive seat, a bidirectional screw fixedly installed on the motor shaft, moving blocks threadedly installed at both ends of the bidirectional screw, and extrusion plates fixedly installed on the tops of the two groups of moving blocks, rubber pads fixedly installed on the inner walls of the two groups of extrusion plates, and the two groups of moving blocks are slidably connected to the inner cavity of the drive seat.

[0010] As a preferred embodiment of the present invention, a limiting groove is provided in the middle of the top end of the driving seat, and the limiting groove is slidably connected to the two groups of moving blocks.

[0011] As a preferred embodiment of the present invention, a branch pipe is installed on both sides of the top of the natural gas pipeline, the branch pipe is a U-shaped pipe, control boxes are fixedly installed on both sides of the branch pipe, and two groups of control boxes and both sides of the natural gas pipeline are installed with second solenoid valves.

[0012] As a preferred embodiment of the present invention, the negative pressure end of the negative pressure pump is connected to a three-way joint, and the two component interfaces of the three-way joint are respectively connected to the hydrogen bottle and the negative pressure pipe. The hydrogen bottle is fixedly installed on the top of the outer side of the detection box, and a fourth solenoid valve is fixedly installed on one end of the hydrogen bottle.

[0013] As a preferred embodiment of the present invention, fixing parts are fixedly installed on the top and bottom of the balloon, elastic ropes are fixedly installed in the middle of the two groups of fixing parts, and the two groups of elastic ropes are respectively fixedly installed on the inner wall of the detection box and the side wall of the driving seat.

[0014] As a preferred embodiment of the present invention, a detection cavity is installed on the top of the flame photometer, an exhaust pipe is installed at the other end of the top of the detection cavity, the other end of the exhaust pipe passes through the side wall of the detection box and is connected to the outside world, and a third solenoid valve is fixedly installed at one end of the exhaust pipe.

[0015] As a preferred embodiment of the present invention, cabinet doors are rotatably installed on both sides of the front end of the detection box through hinges, a lock pin is fixedly installed in the middle of the other end of the cabinet door and corresponds to the side wall of the detection box, and a handle is fixedly installed on one side of the front end of the cabinet door.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention combines a gas collection mechanism with an extrusion mechanism. When the negative pressure pump inside the gas collection mechanism is driven, the natural gas remaining in the natural gas pipeline can be introduced into the balloon. After the balloon continues to expand and the air pressure value inside the balloon reaches the set value of the air pressure sensor, the negative pressure pump will be stopped and the motor inside the extrusion mechanism will be turned on to drive the bidirectional screw inside the driving seat to rotate. When the bidirectional screw synchronously drives the two groups of moving blocks to move inward, the two groups of moving blocks drive the two groups of extrusion plates to continuously squeeze the balloon, and the quantitative natural gas collected inside the balloon is squeezed into the detection chamber at the top of the gas chromatograph, and high-precision detection is performed through a flame photometer. This process does not require manual sampling, quantitative collection and detection of natural gas, and greatly improves the efficiency of sulfide detection in natural gas.

[0018] 2. The present invention installs an exhaust pipe at the other end of the top of the detection chamber, and the negative pressure end of the negative pressure pump is connected to the hydrogen cylinder through a three-way joint. When the gas chromatograph performs high-precision detection on the quantitatively collected natural gas, it will close the second solenoid valves in the two control boxes and open the second solenoid valve on the natural gas pipeline, so that the natural gas can flow normally on the natural gas pipeline. The first solenoid valve on the negative pressure pipe is closed and the negative pressure pump is opened at the same time. The hydrogen in the hydrogen cylinder can be continuously introduced into the balloon, and then introduced into the detection tube, the detection chamber and the exhaust pipe in turn, and finally discharged to the outside. It can effectively purify the residual gas in the pipeline and the balloon, and avoid the residual gas in the pipeline and the balloon when the device detects sulfides in natural gas again, thereby further improving the accuracy of the secondary detection of sulfides in natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 It is a front view of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the detection box of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the gas chromatograph of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the driving seat of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the detection box of the present invention;

[0025] In the figure: 1. Natural gas pipeline; 11. Branch pipe; 12. Control box; 13. Positioning ring; 14. Mounting bracket; 15. Detection box; 2. Negative pressure pump; 21. Negative pressure pipe; 22. Gas pipe; 23. Balloon; 24. Air pressure sensor; 25. Detection tube; 26. Gas chromatograph; 3. Drive seat; 31. Bidirectional screw rod; 32. Moving block; 33. Extrusion plate; 34. Motor; 35. Limiting groove; 4. Hydrogen cylinder; 41. Fixing piece; 42. Detection chamber; 43. Exhaust pipe; 44. Cabinet door. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Example 1: See Figure 1-5 A device for detecting sulfide in natural gas comprises a natural gas pipeline 1, positioning rings 13 are fixedly installed on both sides of the natural gas pipeline 1, mounting frames 14 are fixedly installed on the bottoms of two sets of positioning rings 13, and detection boxes 15 are fixedly installed on the bottoms of the two sets of mounting frames 14 by bolts, a negative pressure pipe 21 is installed on one end of the top of the detection box 15, and a gas collecting mechanism is installed on one end of the negative pressure pipe 21. The natural gas inside the natural gas pipeline 1 can be quantitatively collected into the inside of the balloon 23 through the gas collecting mechanism, so that the gas chromatograph 26 can detect the natural gas. The gas collecting mechanism includes a gas spherical ball 23 formed on the inner wall of the detection box 15. A negative pressure pump 2 fixedly installed on the side, a negative pressure pipe 21 connected and installed at the negative pressure end of the negative pressure pump 2, a gas pipe 22 connected and installed at the outlet port of the negative pressure pump 2, a balloon 23 connected and installed at the other end of the gas pipe 22, an air pressure sensor 24 connected and installed at one end of the balloon 23, a detection tube 25 connected and installed at the bottom of the balloon 23, and a gas chromatograph 26 connected and installed at the other end of the detection tube 25, a flame photometer is installed inside the gas chromatograph 26, the other end of the negative pressure pipe 21 is connected and installed with the natural gas pipeline 1, and a first solenoid valve is installed at one end of the negative pressure pipe 21, the gas pipe 22 and the detection tube 25;

[0029] A drive seat 3 is fixedly installed on the inner side wall of the detection box 15, and an extrusion mechanism is installed in the drive seat 3. The balloon 23 can be squeezed by the extrusion mechanism, so that the quantitative natural gas inside the balloon 23 is squeezed into the gas chromatograph 26, and the collected natural gas is tested. The extrusion mechanism includes a motor 34 fixedly installed in the middle of the side wall of the drive seat 3, a bidirectional screw rod 31 fixedly installed on the shaft of the motor 34, moving blocks 32 threadedly installed at both ends of the bidirectional screw rod 31, and extrusion plates 33 fixedly installed on the tops of the two groups of moving blocks 32, rubber pads fixedly installed on the inner walls of the two groups of extrusion plates 33, and the two groups of moving blocks 32 are slidably connected to the inner cavity of the drive seat 3.

[0030] When in use, the gas collecting mechanism is first combined with the squeezing mechanism. When the second solenoid valve on the natural gas pipeline 1 is closed, the second solenoid valves in the two control boxes 12 are opened, so that the natural gas can be continuously supplied from the branch pipe 11 to the other end of the six-channel natural gas pipeline 1, ensuring that the natural gas can be continuously used during the detection process. At the same time, the negative pressure pump 2 in the gas collecting mechanism is driven, multiple groups of first solenoid valves are opened, and the third solenoid valve and the fourth solenoid valve are closed, so that the natural gas remaining in the natural gas pipeline 1 can be introduced into the balloon 23, and the balloon 23 is waited for to expand continuously. After the air pressure value in the balloon 23 reaches the set value of the air pressure sensor 24, the negative pressure pump 2 will be stopped, and the motor 34 in the squeezing mechanism will be opened to drive the bidirectional screw 31 in the driving seat 3 to rotate. When the bidirectional screw 31 synchronously drives the two groups of moving blocks 32 to move inward, the two groups of moving blocks 32 drive the two groups of squeezing plates 33 to continuously squeeze the balloon 23, and squeeze the quantitative natural gas collected in the balloon 23 into the detection cavity 42 at the top of the gas chromatograph 26, through The flame photometer performs high-precision detection. This process does not require manual sampling, quantitative collection and detection of natural gas, which greatly improves the detection efficiency of sulfide in natural gas. At the same time, an exhaust pipe 43 is installed at the other end of the top of the detection chamber 42, and the negative pressure end of the negative pressure pump 2 is connected to the hydrogen cylinder 4 through a three-way joint. When the gas chromatograph 26 performs high-precision detection on the quantitatively collected natural gas, the second solenoid valves in the two groups of control boxes 12 will be closed, and the second solenoid valve on the natural gas pipeline 1 will be opened, so that the natural gas can flow normally on the natural gas pipeline 1. The first solenoid valve on the negative pressure pipe 21 is closed and the negative pressure pump 2 is opened. The hydrogen in the hydrogen cylinder 4 can be continuously introduced into the balloon 23, and then introduced into the detection tube 25, the detection chamber 42 and the exhaust pipe 43 in turn, and finally discharged to the outside, which can effectively purify the residual gas in the pipeline and the balloon 23, and avoid the residual gas in the pipeline and the balloon 23 when the device detects sulfide in natural gas again, thereby further improving the accuracy of the secondary detection of sulfide in natural gas.

[0031] For details, see Figure 1-5The negative pressure end of the negative pressure pump 2 is connected and installed with a three-way joint. The two component interfaces of the three-way joint are respectively connected and installed with the hydrogen bottle 4 and the negative pressure tube 21. The hydrogen bottle 4 is fixedly installed on the top of the outer side of the detection box 15. The fourth solenoid valve is fixedly installed on one end of the hydrogen bottle 4. A detection cavity 42 is installed on the top of the flame photometer. An exhaust pipe 43 is installed on the other end of the top of the detection cavity 42. The other end of the exhaust pipe 43 penetrates the side wall of the detection box 15 and is connected with the outside world. A third solenoid valve is fixedly installed on one end of the exhaust pipe 43. Working principle and benefits.

[0032] For further information, see Figure 1-5 A limiting groove 35 is provided in the middle of the top of the driving seat 3, and the limiting groove 35 is slidably connected with the two groups of moving blocks 32. When the driving motor 34 drives the screw to rotate, the limiting groove 35 is slidably connected with the two groups of moving blocks 32, so that the two groups of moving blocks 32 can be limited to ensure that the two groups of moving blocks 32 move horizontally, driving the two groups of extrusion plates 33 to squeeze the balloon 23.

[0033] Further, see Figure 1-5 A branch pipe 11 is installed on both sides of the top of the natural gas pipeline 1. The branch pipe 11 is a U-shaped pipe. Control boxes 12 are fixedly installed on both sides of the branch pipe 11. Second solenoid valves are installed on both sides of the two groups of control boxes 12 and the natural gas pipeline 1. When the second solenoid valve on the natural gas pipeline 1 is closed and the second solenoid valves inside the two groups of control boxes 12 are opened, the natural gas can be continuously connected from the branch pipe 11 to the other end of the six-channel natural gas pipeline 1, ensuring that the natural gas can be continuously used during the detection process.

[0034] It is worth noting that see Figure 1-5 The top and bottom of the balloon 23 are fixedly installed with fixing parts 41, and the middle parts of the two groups of fixing parts 41 are fixedly installed with elastic ropes. The two groups of elastic ropes are respectively fixedly installed on the inner wall of the detection box 15 and the side wall of the driving seat 3. When the balloon 23 is inflated and squeezed, the fixing parts 41 fixedly installed on both sides of the balloon 23 cooperate with each other and are positioned between the inner wall of the detection box 15 and the driving seat 3 through the elastic ropes, ensuring that the two groups of squeezing plates 33 can accurately squeeze the balloon 23 when being driven.

[0035] It is worth noting that see Figure 1-5 Cabinet doors 44 are installed on both sides of the front end of the detection box 15 through hinges, and a lock pin is fixedly installed in the middle of the other end of the cabinet door 44, and corresponds to the side wall of the detection box 15. A handle is fixedly installed on one side of the front end of the cabinet door 44. When the operator regularly inspects the inside of the detection box 15, he can directly open the lock pin on one side of the cabinet door 44, hold the handle and open the cabinet door 44.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for detecting sulfide in natural gas, comprising a natural gas pipeline (1), characterized in that: Positioning rings (13) are fixedly installed on both sides of the natural gas pipeline (1), mounting frames (14) are fixedly installed on the bottoms of the two groups of positioning rings (13), and detection boxes (15) are fixedly installed on the bottoms of the two groups of mounting frames (14) by bolts, and a negative pressure tube (21) is installed on one end of the top of the detection box (15), and a gas collection mechanism is installed on one end of the negative pressure tube (21). The gas collection mechanism can be used to quantitatively collect natural gas inside the natural gas pipeline (1) into the balloon (23), so as to facilitate the gas chromatograph (26) to detect the natural gas; A drive seat (3) is fixedly mounted on the inner side wall of the detection box (15), and a squeezing mechanism is mounted inside the drive seat (3). The squeezing mechanism can squeeze the balloon (23) so that the quantitative natural gas inside the balloon (23) is squeezed into the gas chromatograph (26) to detect the collected natural gas.

2. A device for detecting sulfide in natural gas according to claim 1, characterized in that: The gas collection mechanism comprises a negative pressure pump (2) fixedly mounted on one side of the inner wall of the detection box (15), a negative pressure pipe (21) connected and mounted at the negative pressure end of the negative pressure pump (2), a gas pipe (22) connected and mounted at the outlet port of the negative pressure pump (2), a balloon (23) connected and mounted at the other end of the gas pipe (22), a pressure sensor (24) connected and mounted at one end of the balloon (23), a detection pipe (25) connected and mounted at the bottom of the balloon (23), and a gas chromatograph (26) connected and mounted at the other end of the detection pipe (25), wherein a flame photometer is mounted inside the gas chromatograph (26), the other end of the negative pressure pipe (21) is connected and mounted to the natural gas pipeline (1), and a first solenoid valve is mounted at one end of each of the negative pressure pipe (21), the gas pipe (22) and the detection pipe (25).

3. The device for detecting sulfide in natural gas according to claim 1, characterized in that: The extrusion mechanism comprises a motor (34) fixedly mounted in the middle of the side wall of the drive seat (3), a bidirectional screw (31) fixedly mounted on the shaft of the motor (34), moving blocks (32) threadedly mounted at both ends of the bidirectional screw (31), and extrusion plates (33) fixedly mounted on the tops of two groups of the moving blocks (32), rubber pads fixedly mounted on the inner walls of the two groups of the extrusion plates (33), and the two groups of the moving blocks (32) are slidably connected to the inner cavity of the drive seat (3).

4. A device for detecting sulfide in natural gas according to claim 3, characterized in that: A limiting groove (35) is provided in the middle of the top end of the driving seat (3), and the limiting groove (35) is slidably connected to the two groups of moving blocks (32).

5. The device for detecting sulfide in natural gas according to claim 1, characterized in that: A branch pipe (11) is installed on both sides of the top of the natural gas pipeline (1), the branch pipe (11) is a U-shaped pipe, control boxes (12) are fixedly installed on both sides of the branch pipe (11), and two sets of the control boxes (12) and both sides of the natural gas pipeline (1) are installed with second solenoid valves.

6. A device for detecting sulfide in natural gas according to claim 2, characterized in that: The negative pressure end of the negative pressure pump (2) is connected to a three-way joint, and two component interfaces of the three-way joint are connected to the hydrogen bottle (4) and the negative pressure pipe (21) respectively. The hydrogen bottle (4) is fixedly installed on the top of the outer side of the detection box (15), and a fourth solenoid valve is fixedly installed at one end of the hydrogen bottle (4).

7. A device for detecting sulfide in natural gas according to claim 2, characterized in that: The top and bottom of the balloon (23) are both fixedly mounted with fixing members (41), the middle parts of the two groups of fixing members (41) are both fixedly mounted with elastic ropes, and the two groups of elastic ropes are respectively fixedly mounted to the inner wall of the detection box (15) and the side wall of the driving seat (3).

8. The device for detecting sulfide in natural gas according to claim 2, characterized in that: A detection chamber (42) is installed on the top of the flame photometry detector, an exhaust pipe (43) is installed at the other end of the top of the detection chamber (42), the other end of the exhaust pipe (43) penetrates the side wall of the detection box (15) and communicates with the outside, and a third solenoid valve is fixedly installed at one end of the exhaust pipe (43).

9. The device for detecting sulfide in natural gas according to claim 1, characterized in that: Cabinet doors (44) are rotatably mounted on both sides of the front end of the detection box (15) via hinges, a lock pin is fixedly mounted in the middle of the other end of the cabinet door (44) and corresponds to the side wall of the detection box (15), and a handle is fixedly mounted on one side of the front end of the cabinet door (44).

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