A device and method for detecting sulfide in petroleum and natural gas

Abstract

The present invention discloses a detection device and method for sulfide in petroleum and natural gas, which relates to the technical field of natural gas detection, including a natural gas pipeline, a movable displacement piece connected to a detection tube is arranged on a movable tube, and a disconnecting and compressing gas piece is arranged between a pressure plug and the movable tube. The present invention sets a disconnecting and compressing gas piece, and when the valve is opened by turning the valve knob, the second piston rod moves downward, and the bayonet pin is inserted into the locking hole. When the valve is closed, the third telescopic spring is restored, so that the bayonet pin is separated from the locking hole. At this time, the extension rod moves downward under the action of the elastic restoring force of the first telescopic spring, so that the bottom of the pressure plug can fit with the bottom of the inner wall of the detection tube, so that the natural gas inside the detection tube is discharged from the detection tube through the second one-way valve, so that the residual natural gas inside the detection tube can be prevented from affecting the subsequent natural gas detection, and the accuracy of the detection data is further improved.

Description

Technical Field

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

[0002] 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. When natural gas is used, in order to avoid safety hazards caused by sulfide detection exceeding the standard in natural gas, it is necessary to detect sulfides in natural gas.

[0003] In order to improve the accuracy of detection of sulfides in natural gas, it is necessary to conduct multiple tests on the natural gas. After a test on the natural gas in the pipeline, a period of time must be allowed to pass before a second test on the natural gas in the gas pipeline. However, after a test, there will be residual gas in the test tube, which will affect the results of subsequent tests and thus affect the accuracy of the test. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for detecting sulfides in petroleum and natural gas in order to solve the problem of poor detection accuracy.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting sulfides in petroleum and natural gas, comprising a natural gas pipeline, a valve is installed on the outer wall of the natural gas pipeline, a valve knob is arranged on the valve, a first one-way valve is installed on the top of the valve, a detection cylinder is arranged at one end of the first one-way valve, a movable tube extending to the inside of the detection cylinder is inserted at the top of the detection cylinder, a movable displacement piece connected to the detection cylinder is arranged on the movable tube, the movable tube is connected to a detection probe connected to an external detection display through the movable displacement piece, a pressure plug located below the movable tube is slidably connected to the inner side of the detection cylinder, a disconnecting and compressing gas piece is arranged between the pressure plug and the movable tube, an observation window is installed on the outer wall of the detection cylinder, and a second one-way valve connected to an external purifier is arranged at the bottom of the detection cylinder.

[0006] As a further solution of the present invention: the air inlet end of the first one-way valve is connected to the valve, and the air inlet end of the second one-way valve is connected to the bottom of the detection tube.

[0007] As a further solution of the present invention: the movable shifting member includes a guide tube installed on the top of the detection cylinder, the top of the pressure plug is provided with an extension rod extending to the inside of the guide tube, the extension rod is provided with a first telescopic spring located on the inside of the guide tube and connected to the guide tube, the top of the detection cylinder is provided with a support frame located on one side of the guide tube, the support frame is rotatably connected with a turntable via a rotating shaft, one end of the rotating shaft connecting the turntable and the support frame is provided with a worm gear, the top of the support frame is rotatably connected with a worm meshing with the worm gear, one end of the worm gear is provided with a rotating connecting rod, one side of the turntable is provided with a connecting column, the outer wall of the movable tube is installed with an L-shaped connecting plate located above the detection cylinder, and the top of the L-shaped connecting plate is provided with a straight groove frame located on the outside of the connecting column.

[0008] As a further solution of the present invention: the inner wall diameter of the movable tube is larger than the diameter of the detection probe.

[0009] As a further solution of the present invention: the length of the straight slot frame is greater than the diameter of the turntable, the connecting column and the center of the turntable are in a misaligned state, and the diameter of the connecting column is equal to the width of the inner side of the straight slot frame.

[0010] As a further solution of the present invention: the disconnecting compressed air part includes a liquid storage tank installed at the bottom of the detection cylinder and located on the side of the first one-way valve away from the second one-way valve, a first piston rod is inserted into the interior of the liquid storage tank, a cam is installed on the valve knob, a ring groove is provided on the side of the cam close to the liquid storage tank, the ring groove is aligned with the edge of the cam, a positioning roller slidably connected to the ring groove is provided at the bottom of the first piston rod, a piston connecting cylinder located on the inner side of the detection cylinder is installed on the outer wall of the movable tube, a second piston rod extending to the bottom of the piston connecting cylinder is inserted into the interior of the piston connecting cylinder, a third telescopic spring connected to the piston connecting cylinder is provided on the second piston rod, and the A threaded sleeve is provided on the inner side of the pressure plug block, a connecting plate located on one side of the extension rod is placed on the top of the pressure plug block, a bayonet is inserted on the top of the connecting plate, a T-shaped push rod is inserted on the inner side of the bayonet, one end of the T-shaped push rod is provided with a second telescopic spring connected to the inner wall of the bayonet, the end of the T-shaped push rod away from the bayonet is rotatably connected to an oblique guide rod through a rotating shaft, the top of the oblique guide rod is rotatably connected to a clamping ring through a rotating shaft, a hose is provided on the top of the piston cylinder, a connecting conduit connected to a liquid storage tank is installed on the top of the hose, a locking hole is opened on the extension rod, and a threaded column connected to the threaded sleeve is provided on the outer side of the detection probe.

[0011] As a further solution of the present invention: the locking hole and the detection probe have the same diameter, and a ball is provided at one end of the locking pin close to the locking hole.

[0012] As a further solution of the present invention: the number of the oblique connecting guide rods is two, and the two oblique connecting guide rods are symmetrically arranged along the vertical center axis of the clamping ring.

[0013] As a further solution of the present invention: a through hole with a diameter larger than the outer wall of the threaded sleeve is provided on the inner side of the connecting plate.

[0014] The present invention also discloses a method for detecting sulfides in petroleum and natural gas, which uses the above-mentioned device for detecting sulfides in petroleum and natural gas, and comprises the following steps:

[0015] S1: Open the valve by turning the valve knob;

[0016] S2: operating the movable shifting member to make the disconnecting and compressing gas member operate, so that the compressing plug is connected to the movable pipe;

[0017] S3: operating the movable shifting member to move the pressure plug in a direction away from the detection cylinder, so that part of the natural gas in the natural gas pipeline enters the detection cylinder through the valve and the first one-way valve, and at this time, the natural gas entering the detection cylinder is detected by the detection probe;

[0018] S4: After the test is completed, the valve is closed by operating the valve knob. At this time, the disconnecting compressed air component will lose the connection with the movable tube and the pressure plug, so that the pressure plug is connected to the bottom of the inner wall of the test tube. At the same time, the natural gas inside the test tube will be discharged through the second one-way valve, and then the discharged natural gas will be processed by the external purifier, so as to prevent the residual natural gas in the test tube;

[0019] S5: The valve is then opened again by the valve knob, and the natural gas is then tested a second time by the coordinated operation of the movable shifting member and the disconnecting and compressing gas member.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting a movable displacement part and a disconnecting and compressing part, rotating the rotating connecting rod, the worm drives the worm wheel to rotate through the rotation of the rotating connecting rod, so that the worm wheel drives the turntable to rotate. When the turntable rotates, the movable pipe is driven to move up and down reciprocatingly through the side connecting plate, the straight groove frame, and the clamping roller. The disconnecting and compressing part is cooperated to make the pressure plug and the movable pipe move synchronously. When the pressure plug moves in the direction away from the first one-way valve, the natural gas inside the natural gas pipeline can be pumped into the detection cylinder. Then, the natural gas entering the detection cylinder is detected through the operation of the detection probe. The operation is simple and the detection efficiency is further improved.

[0022] 2. By setting a disconnecting and compressing gas part, when the valve is opened by turning the valve knob, the second piston rod moves downward, and the bayonet pin is inserted into the locking hole. When the valve is closed, the third telescopic spring recovers, thereby separating the bayonet pin from the locking hole. At this time, the extension rod moves downward under the elastic restoring force of the first telescopic spring, so that the bottom of the pressure plug can fit with the bottom of the inner wall of the detection cylinder, so that the natural gas inside the detection cylinder is discharged from the detection cylinder through the second one-way valve, so that the residual natural gas inside the detection cylinder can be prevented from affecting the subsequent natural gas detection, thereby further improving the accuracy of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a side view of the present invention;

[0025] Figure 3 It is a schematic diagram of the bottom structure of the detection tube of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the detection tube of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 It is a schematic diagram of the connection between the movable tube and the rotating disk of the present invention;

[0029] Figure 7 It is a schematic diagram of the connection between the clamp ring and the connecting plate of the present invention;

[0030] Figure 8 It is a schematic diagram of the connection between the cam and the first piston rod of the present invention.

[0031] In the figure: 1, natural gas pipeline; 2, valve; 3, first non-return valve; 4, detection tube; 5, connecting conduit; 6, support frame; 7, worm gear; 8, guide tube; 9, liquid storage tank; 10, valve knob; 11, cam; 12, second non-return valve; 13, observation window; 14, movable tube; 15, turntable; 16, detection probe; 17, worm; 18, first telescopic spring; 19, extension rod; 20, snap ring; 21, first piston rod ; 22. Pressing block; 23. Connecting plate; 24. Oblique connecting guide rod; 25. T-type pushing rod; 26. Bayonet pin; 27. Locking connecting hole; 28. Second telescopic spring; 29. ​​Rotating connecting rod; 30. Positioning roller; 31. Straight groove frame; 32. Connecting column; 33. Hose; 34. Piston connecting cylinder; 35. Second piston rod; 36. Third telescopic spring; 37. Threaded sleeve; 38. Ring groove; 39. Threaded column; 40. L-type connecting plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0034] See also Figures 1 to 8 In an embodiment of the present invention, a device for detecting sulfides in petroleum and natural gas includes a natural gas pipeline 1, a valve 2 is installed on the outer wall of the natural gas pipeline 1, a valve knob 10 is arranged on the valve 2, a first one-way valve 3 is installed on the top of the valve 2, a detection cylinder 4 is arranged at one end of the first one-way valve 3, a movable tube 14 extending to the inside of the detection cylinder 4 is inserted at the top of the detection cylinder 4, a movable displacement piece connected to the detection cylinder 4 is arranged on the movable tube 14, the movable tube 14 is connected to a detection probe 16 connected to an external detection display through the movable displacement piece, a pressure plug 22 located below the movable tube 14 is slidably connected to the inner side of the detection cylinder 4, a disconnecting and compressing gas piece is arranged between the pressure plug 22 and the movable tube 14, an observation window 13 is installed on the outer wall of the detection cylinder 4, and a second one-way valve 12 connected to an external purifier is arranged at the bottom of the detection cylinder 4.

[0035] In this embodiment: the valve 2 is opened by rotating the valve knob 10, and then the disconnecting and compressing gas piece is operated by operating the movable shifting member, so that the pressure plug 22 is connected to the movable tube 14, and the movable shifting member is operated to move the pressure plug 22 in the direction away from the detection tube 4, so that part of the natural gas inside the natural gas pipeline 1 enters the detection tube 4 through the valve 2 and the first one-way valve 3. At this time, the natural gas entering the detection tube 4 is detected by the detection probe 16. After the detection is completed, the valve 2 is closed by operating the valve knob 10. At this time, the disconnecting and compressing gas piece will lose the connection with the movable tube 14 and the pressure plug 22, so that the pressure plug 22 is connected to the bottom of the inner wall of the detection tube 4, and the natural gas inside the detection tube 4 will be discharged through the second one-way valve 12. Then, the discharged natural gas is processed by an external purifier, so that the residual natural gas in the detection tube 4 can be prevented, and then the valve 2 is opened again by the valve knob 10, and then the natural gas is secondary detected by the coordinated operation of the movable shifting member and the disconnecting and compressing gas piece.

[0036] Please refer to Figure 3 The air inlet end of the first one-way valve 3 is connected to the valve 2 , and the air inlet end of the second one-way valve 12 is connected to the bottom of the detection tube 4 .

[0037] In this embodiment, this structure is provided to achieve unidirectional flow of natural gas inside the detection tube 4 , thereby preventing the natural gas entering the detection tube 4 from entering the natural gas pipeline 1 again and affecting the purity of the natural gas in the natural gas pipeline 1 .

[0038] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 The movable displacement member includes a guide tube 8 installed on the top of the detection tube 4, a stretching rod 19 extending to the inside of the guide tube 8 is arranged on the top of the pressure plug 22, and a first telescopic spring 18 located on the inside of the guide tube 8 and connected to the guide tube 8 is arranged on the stretching rod 19. A support frame 6 located on one side of the guide tube 8 is arranged on the top of the detection tube 4, a turntable 15 is rotatably connected to the support frame 6 through a rotating shaft, a worm gear 7 is arranged at one end of the rotating shaft connecting the turntable 15 and the support frame 6, a worm 17 meshing with the worm gear 7 is rotatably connected to the top of the support frame 6, a rotating connecting rod 29 is arranged at one end of the worm 17, a connecting column 32 is arranged on one side of the turntable 15, an L-shaped connecting plate 40 located above the detection tube 4 is installed on the outer wall of the movable tube 14, and a straight groove frame 31 located on the outside of the connecting column 32 is arranged on the top of the L-shaped connecting plate 40.

[0039] In this embodiment: the rotating connecting rod 29 is rotated, and the worm 17 drives the worm wheel 7 to rotate through the rotation of the rotating connecting rod 29, so that the worm wheel 7 drives the turntable 15 to rotate. When the turntable 15 rotates, it drives the movable tube 14 to move up and down reciprocatingly through the connecting column 32, the straight groove frame 31, and the L-shaped connecting plate 40, and cooperates with the disconnecting and compressing gas parts to make the pressure plug 22 and the movable tube 14 move synchronously. When the pressure plug 22 moves in the direction away from the first one-way valve 3, the natural gas inside the natural gas pipeline 1 can be pumped into the detection tube 4, and then the natural gas entering the detection tube 4 is detected through the operation of the detection probe 16. The operation is simple and the detection efficiency is further improved.

[0040] Please refer to Figure 4 , the inner wall diameter of the movable tube 14 is larger than the diameter of the detection probe 16 .

[0041] In this embodiment, this structure is provided to prevent the movable tube 14 from rubbing against the outer wall of the detection probe 16 when the movable tube 14 moves.

[0042] Please refer to Figure 6 The length of the straight groove frame 31 is greater than the diameter of the turntable 15 , the connecting column 32 and the center of the turntable 15 are in a misaligned state, and the diameter of the connecting column 32 is equal to the width of the inner side of the straight groove frame 31 .

[0043] In this embodiment: by setting this structure, when the turntable 15 rotates, the connecting column 32 drives the straight groove frame 31 to move up and down reciprocatingly, and at the same time, the worm 17 locks the worm wheel 7 to improve the stability of the pressure plug 22 after movement.

[0044] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8The disconnecting compressed air component includes a liquid storage tank 9 installed at the bottom of the detection cylinder 4 and located on the side of the first one-way valve 3 away from the second one-way valve 12. The first piston rod 21 is inserted into the liquid storage tank 9. A cam 11 is installed on the valve knob 10. A ring groove 38 is provided on the side of the cam 11 close to the liquid storage tank 9. The ring groove 38 is aligned with the edge of the cam 11. A positioning roller 30 slidably connected to the ring groove 38 is provided at the bottom of the first piston rod 21. A piston connecting cylinder 34 located on the inner side of the detection cylinder 4 is installed on the outer wall of the movable tube 14. A second piston rod 35 extending to the bottom of the piston connecting cylinder 34 is inserted into the interior of the piston connecting cylinder 34. A third telescopic spring 36 connected to the piston connecting cylinder 34 is provided on the second piston rod 35. The inner side of the pressure plug 22 A threaded sleeve 37 is provided, and a connecting plate 23 located on one side of the extension rod 19 is placed on the top of the pressure plug 22. A bayonet 26 is inserted on the top of the connecting plate 23, and a T-shaped push rod 25 is inserted on the inner side of the bayonet 26. One end of the T-shaped push rod 25 is provided with a second telescopic spring 28 connected to the inner wall of the bayonet 26. The end of the T-shaped push rod 25 away from the bayonet 26 is rotatably connected to the oblique guide rod 24 through a rotating shaft. The top of the oblique guide rod 24 is rotatably connected to the retaining ring 20 through a rotating shaft. A hose 33 is provided on the top of the piston cylinder 34, and a connecting conduit 5 connected to the liquid storage tank 9 is installed on the top of the hose 33. A locking hole 27 is opened on the extension rod 19, and a threaded column 39 connected to the threaded sleeve 37 is provided on the outer side of the detection probe 16.

[0045] In this embodiment, when the valve 2 is opened by turning the valve knob 10, the cam 11 rotates with the rotation of the valve knob 10. At this time, the cam 11 squeezes the first piston rod 21 through the annular groove 38 and the positioning roller 30, so that the first piston rod 21 moves upward, so that the aqueous solution inside the liquid storage tank 9 enters the piston tube 34 through the connecting conduit 5 and the hose 33, so that the second piston rod 35 moves downward. When the second piston rod 35 moves downward, it will drive The clamping ring 20 moves downward, so that the end of the oblique connecting rod 24 away from the clamping ring 20 squeezes the T-shaped pushing rod 25, so that the T-shaped pushing rod 25 drives the bayonet 26 to move horizontally. If the locking hole 27 is not aligned with the bayonet 26, the T-shaped pushing rod 25 moves relative to the bayonet 26, and one end of the bayonet 26 is attached to the stretching rod 19. At the same time, the second telescopic spring 28 contracts. As the movable tube 14 moves, when the bayonet 26 is aligned with the locking hole 27, the bayonet 26 is When the valve 2 is closed, the third telescopic spring 36 is restored, and at the same time, the aqueous solution inside the piston tube 34 enters the liquid storage tank 9 through the hose 33 and the connecting conduit 5, so that the clamping ring 20 moves relative to the movable tube 14, so that the bayonet 26 is separated from the locking hole 27. At this time, the stretching rod 19 moves downward under the action of the elastic restoring force of the first telescopic spring 18, so that the bottom of the pressure plug 22 can fit with the bottom of the inner wall of the detection cylinder 4, so that the natural gas inside the detection cylinder 4 is discharged from the detection cylinder 4 through the second one-way valve 12. In this way, it is prevented that the residual natural gas in the detection cylinder 4 affects the subsequent natural gas detection, thereby further improving the accuracy of the detection data.

[0046] Please refer to Figure 5 , Figure 7 The locking hole 27 has the same diameter as the detection probe 16 , and a ball is provided at one end of the latch 26 close to the locking hole 27 .

[0047] In this embodiment, this structure is provided to reduce the friction between the bayonet 26 and the stretching rod 19 when the bayonet 26 and the stretching rod 19 move in close proximity, and also improve the stability of the connection between the connecting plate 23 and the stretching rod 19 when the bayonet 26 is inserted into the locking hole 27.

[0048] Please refer to Figure 4 , Figure 7 There are two oblique connecting guide rods 24 , and the two oblique connecting guide rods 24 are symmetrically arranged along the vertical center axis of the clamping ring 20 .

[0049] In this embodiment, by providing this structure, the forces on both sides of the connecting plate 23 are equal, thereby further improving the stability of the connecting plate 23 driving the pressing plug 22 to move.

[0050] Please refer to Figure 4 , Figure 7 A through hole having a diameter larger than that of the outer wall of the threaded sleeve 37 is provided on the inner side of the connecting plate 23 .

[0051] In this embodiment, this structure is provided to prevent the threaded sleeve 37 from hindering the movement of the connecting plate 23 .

[0052] In combination with the above-mentioned device for detecting sulfides in petroleum and natural gas, a method for detecting sulfides in petroleum and natural gas is provided below, which specifically includes the following steps:

[0053] S1: Valve 2 is opened by turning the valve knob 10;

[0054] S2: The cam 11 rotates with the rotation of the valve knob 10. At this time, the cam 11 squeezes the first piston rod 21 through the annular groove 38 and the positioning roller 30, so that the first piston rod 21 moves upward, so that the aqueous solution inside the liquid storage tank 9 enters the piston tube 34 through the connecting conduit 5 and the hose 33, so that the second piston rod 35 moves downward. When the second piston rod 35 moves downward, it drives the clamping ring 20 to move downward, so that the end of the oblique connecting rod 24 away from the clamping ring 20 presses against the T-shaped push rod 25 is squeezed, so that the T-shaped push rod 25 drives the bayonet 26 to move horizontally. If the locking hole 27 and the bayonet 26 are not aligned, the T-shaped push rod 25 moves relative to the bayonet 26, and one end of the bayonet 26 is attached to the stretching rod 19, and the second telescopic spring 28 is contracted. With the movement of the movable tube 14, when the bayonet 26 is aligned with the locking hole 27, the bayonet 26 is inserted into the locking hole 27 under the action of the elastic restoring force of the second telescopic spring 28, so as to realize the connection between the stretching rod 19 and the connecting plate 23;

[0055] S3: Rotate the rotary connecting rod 29, and the worm 17 drives the worm wheel 7 to rotate by the rotation of the rotary connecting rod 29, so that the worm wheel 7 drives the turntable 15 to rotate. When the turntable 15 rotates, it drives the movable pipe 14 to move up and down through the connecting column 32, the straight groove frame 31, and the L-shaped connecting plate 40, so that the pressure plug 22 is connected to the connecting plate 23. At this time, when the connecting plate 23 moves with the movable pipe 14, it drives the pressure plug 22 to move. When the pressure plug 22 moves in the direction away from the first one-way valve 3, the natural gas inside the natural gas pipeline 1 can be pumped into the detection tube 4, and then the natural gas entering the detection tube 4 is detected by the operation of the detection probe 16. The operation is simple and the detection efficiency is further improved.

[0056] S4: After the detection is completed, the valve 2 is closed by operating the valve knob 10. When the valve 2 is closed, the third telescopic spring 36 is restored, and at the same time, the aqueous solution inside the piston tube 34 will enter the liquid storage tank 9 through the hose 33 and the connecting conduit 5, so that the clamping ring 20 moves relative to the movable tube 14, so that the bayonet 26 is separated from the locking hole 27. At this time, the extension rod 19 will move downward under the elastic restoring force of the first telescopic spring 18, so that the bottom of the pressure plug 22 can fit with the bottom of the inner wall of the detection tube 4, so that the natural gas inside the detection tube 4 is discharged from the detection tube 4 through the second one-way valve 12, so that the residual natural gas inside the detection tube 4 can be prevented from affecting the subsequent natural gas detection, and the accuracy of the detection data is further improved;

[0057] S5: Then, the valve 2 is opened again by the valve knob 10, and then the natural gas is tested again by the cooperation of the movable shifting part and the disconnecting and compressing gas part.

[0058] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting sulfide in petroleum and natural gas, comprising a natural gas pipeline (1), characterized in that: The outer wall of the natural gas pipeline (1) is provided with a valve (2), the valve (2) is provided with a valve knob (10), the top of the valve (2) is provided with a first non-return valve (3), one end of the first non-return valve (3) is provided with a detection cylinder (4), the top of the detection cylinder (4) is plugged with a movable tube (14) extending into the interior of the detection cylinder (4), the movable tube (14) is provided with a movable displacement member connected to the detection cylinder (4), the movable tube (14) is connected to a detection probe (16) connected to an external detection display via the movable displacement member, the inner side of the detection cylinder (4) is slidably connected with a pressure plug (22) located below the movable tube (14), a disconnecting and compressing gas member is provided between the pressure plug (22) and the movable tube (14), the outer wall of the detection cylinder (4) is provided with an observation window (13), and the bottom of the detection cylinder (4) is provided with a second non-return valve (12) connected to an external purifier; The movable displacement member comprises a guide tube (8) mounted on the top of the detection tube (4); a stretching rod (19) extending to the inside of the guide tube (8) is arranged on the top of the pressure plug (22); a first telescopic spring (18) located inside the guide tube (8) and connected to the guide tube (8) is arranged on the stretching rod (19); a support frame (6) located on one side of the guide tube (8) is arranged on the top of the detection tube (4); a rotating disk (15) is rotatably connected to the support frame (6) via a rotating shaft; the rotating disk (15) ) is provided with a worm wheel (7) at one end of a rotating shaft connected to a support frame (6); a worm (17) meshing with the worm wheel (7) is rotatably connected to the top of the support frame (6); a rotating connecting rod (29) is provided at one end of the worm (17); a connecting column (32) is provided on one side of the turntable (15); an L-shaped connecting plate (40) located above the detection cylinder (4) is installed on the outer wall of the movable tube (14); and a straight groove frame (31) located outside the connecting column (32) is provided on the top of the L-shaped connecting plate (40).

2. A device for detecting sulfides in petroleum and natural gas according to claim 1, characterized in that: The air inlet end of the first one-way valve (3) is connected to the valve (2), and the air inlet end of the second one-way valve (12) is connected to the bottom of the detection cylinder (4).

3. The device for detecting sulfide in petroleum and natural gas according to claim 1, characterized in that: The inner wall diameter of the movable tube (14) is greater than the diameter of the detection probe (16).

4. The device for detecting sulfide in petroleum and natural gas according to claim 1, characterized in that: The length of the straight slot frame (31) is greater than the diameter of the turntable (15), the center of the connecting column (32) and the turntable (15) are in a misaligned state, and the diameter of the connecting column (32) is equal to the width of the inner side of the straight slot frame (31).

5. The device for detecting sulfide in petroleum and natural gas according to claim 1, characterized in that: The disconnecting and connecting compressed air component comprises a liquid storage tank (9) installed at the bottom of the detection cylinder (4) and located on the side of the first one-way valve (3) away from the second one-way valve (12); a first piston rod (21) is inserted into the interior of the liquid storage tank (9); a cam (11) is installed on the valve knob (10); a ring groove (38) is provided on the side of the cam (11) close to the liquid storage tank (9); the ring groove (38) is aligned with the edge of the cam (11); a locking roller (30) is provided at the bottom of the first piston rod (21) and is slidably connected to the ring groove (38); a piston connecting cylinder (34) located inside the detection cylinder (4) is installed on the outer wall of the movable tube (14); a second piston rod (35) extending to the bottom of the piston connecting cylinder (34) is inserted into the interior of the piston connecting cylinder (34); a third telescopic spring (36) connected to the piston connecting cylinder (34) is provided on the second piston rod (35); and a third telescopic spring (36) connected to the piston connecting cylinder (34) is provided on the inner side of the pressure plug (22). A threaded sleeve (37) is arranged, a connecting plate (23) located on one side of the extension rod (19) is placed on the top of the pressure plug (22), a bayonet (26) is inserted on the top of the connecting plate (23), a T-shaped push rod (25) is inserted on the inner side of the bayonet (26), one end of the T-shaped push rod (25) is provided with a second telescopic spring (28) connected to the inner wall of the bayonet (26), and the end of the T-shaped push rod (25) away from the bayonet (26) is rotated The shaft is rotatably connected to an oblique guide rod (24), the top of the oblique guide rod (24) is rotatably connected to a clamping ring (20) via a rotating shaft, a hose (33) is provided at the top of the piston connecting cylinder (34), a connecting conduit (5) connected to a liquid storage tank (9) is installed at the top of the hose (33), a locking hole (27) is provided on the extension rod (19), and a threaded column (39) connected to a threaded sleeve (37) is provided on the outer side of the detection probe (16).

6. The device for detecting sulfide in petroleum and natural gas according to claim 5, characterized in that: The locking hole (27) has a diameter equal to that of the detection probe (16), and a ball is provided at one end of the latch (26) close to the locking hole (27).

7. The device for detecting sulfide in petroleum and natural gas according to claim 5, characterized in that: The number of the oblique connecting guide rods (24) is two, and the two oblique connecting guide rods (24) are symmetrically arranged along the vertical center axis of the clamping ring (20).

8. The device for detecting sulfide in petroleum and natural gas according to claim 5, characterized in that: A through hole having a diameter larger than the outer wall of the threaded sleeve (37) is provided on the inner side of the connecting plate (23).

9. A method for detecting sulfides in petroleum and natural gas, characterized in that: The device for detecting sulfide in petroleum and natural gas according to any one of claims 1 to 8 comprises the following steps: S1: Open the valve (2) by turning the valve knob (10); S2: operating the movable displacement member to cause the disconnecting and compressing gas member to operate, thereby connecting the compressing plug (22) to the movable pipe (14); S3: operating the movable displacement member to move the pressure plug (22) in a direction away from the detection tube (4), so that part of the natural gas inside the natural gas pipeline (1) enters the detection tube (4) through the valve (2) and the first one-way valve (3), and at this time, the natural gas entering the detection tube (4) is detected by the detection probe (16); S4: After the test is completed, the valve (2) is closed by operating the valve knob (10), and the disconnecting compressed air component loses the connection with the movable tube (14) and the pressure plug (22), so that the pressure plug (22) is connected to the bottom of the inner wall of the test tube (4), and the natural gas inside the test tube (4) is discharged through the second one-way valve (12). The discharged natural gas is then processed by an external purifier, thereby preventing the residual natural gas in the test tube (4); S5: The valve (2) is then opened again by the valve knob (10), and the natural gas is then tested a second time by the coordinated operation of the movable shifting member and the disconnecting and compressing gas member.

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