A sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower

Abstract

The present invention discloses a sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower; it relates to the technical field of sulfur dioxide detection and includes a box body, a lifting mechanism and a lifting box; the box body is arranged in the flue gas tower; the outer wall of the box body is respectively provided with a first through hole and a second through hole, and plugging components are installed on both the first through hole and the second through hole; two sampling components are installed inside the lifting box, and the lifting box is slidably connected to the box body along the vertical direction through the lifting mechanism. The lifting mechanism includes a motor, a first gear, a second gear, a lead screw and a slide bar; the lead screw is rotatably connected to the box body and the rotation axis is arranged along the vertical direction, the slide bar is fixedly arranged in the box body, the lifting box is slidably connected to the slide bar, and the lifting box is connected to the lead screw through a lead screw nut; the motor drives the lead screw to rotate; this application can not only sample the flue gas at the top and bottom from top to bottom in sequence, but also form automatic connection and plugging, realizing sampling of flue gas at different positions, facilitating comparison of data at different positions in the later stage, ensuring that the sampled gas is purer, and also avoiding the random flow of gas in the box body.

Description

Technical Field

[0001] The present invention relates to the technical field of sulfur dioxide detection, and in particular to a sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower. Background Art

[0002] In existing industrial production, flue gas is generated, and the most abundant component inside the flue gas is sulfur dioxide waste gas. Sulfur dioxide is the most common and simplest sulfur oxide. It is a colorless and transparent gas with a pungent odor, soluble in water, ethanol, and ether. Sulfur dioxide is one of the main pollutants in the atmosphere. Especially in the process of treating flue gas in a flue gas tower, the sulfur dioxide gas is mainly treated through packing or spraying technology. To ensure the safety of the treated flue gas, a flue gas sampling device is required for sampling when the flue gas tower treats sulfur dioxide.

[0003] The publication number CN219870519U discloses a chemical gas sampling device. In actual work, this sampler can only collect samples at a single position. However, the working process of the flue gas tower is from bottom to top, and the untreated flue gas passes from the bottom to the top for treatment. Therefore, it is not convenient to simultaneously sample the untreated flue gas at the bottom and the treated flue gas at the top, which is not convenient for users to compare the sulfur dioxide flue gas at different positions to ensure the gas treatment effect of the flue gas tower.

[0004] If you want to sample the upper and lower parts of the flue gas tower, sampling pipes that connect the inside and outside and have a closed plug that can be opened at any time need to be opened separately at the upper and lower parts of the flue gas tower; sampling the lower flue gas is relatively simple, but if you want to sample the upper flue gas, you need to climb to the upper end of the flue gas tower manually for sampling. Considering that the flue gas treatment tower is usually relatively high, this operation method is not only inefficient but also relatively dangerous.

[0005] If the sampling pipe at the upper part of the flue gas tower is extended to the lower part, the sampling pipe will be relatively long. After completing the previous sampling and closing the sampling pipe, a large amount of flue gas will remain inside the pipeline. At this time, the sample for the next sampling of the upper flue gas is actually the sample remaining after the previous sampling. At this time, it is obviously incorrect to compare the lower sampling sample with the upper sampling sample because the sulfur dioxide content of the original flue gas filled at the bottom of the flue gas tower is constantly changing, so it cannot reflect the true treatment effect of the flue gas tower. Summary of the Invention

[0006] In order to facilitate the detection of the upper and lower parts of the flue gas in the flue gas tower to ensure that the flue gas tower is in a normal working state, the present application provides a sampling device for detecting the sulfur dioxide content in the flue gas of the flue gas tower.

[0007] The present application provides a sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower, adopting the following technical solutions:

[0008] A sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower, characterized in that it includes a box body, a lifting mechanism and a lifting box; the box body is arranged in the flue gas tower;

[0009] The outer wall of the box body is respectively provided with a first through hole and a second through hole, and a plugging component for preventing flue gas from entering the box body is installed on both the first through hole and the second through hole;

[0010] Two sampling components for extracting flue gas are installed inside the lifting box, and the lifting box is slidably connected to the box body in the vertical direction through a lifting mechanism;

[0011] The plugging component includes an intake pipe fixed on the inner wall of the box body. The upper and lower sides of the intake pipe are rotatably connected with a first guide wheel. The intake pipe is concentrically embedded with a sealing ring. A first plugging plate is installed at the pipe orifice of the intake pipe. A conical block is fixed at the axis of the first plugging plate, and a first spring is sleeved outside the first plugging plate; when the first spring is in a natural state, the first plugging plate closes the intake pipe;

[0012] The sampling component includes a sampling cylinder fixed inside the lifting box. A piston rod is slidably connected inside the sampling cylinder. A push-pull plate is fixed at the outer end of the piston rod. First chutes and second chutes are respectively opened at the upper and lower parts of the sampling cylinder inside the lifting box. Limiting springs are fixed inside both the first chute and the second chute. A conical pipe is slidably connected inside the first chute and the second chute. First inner plates and second inner plates are respectively fixed at both ends of the inner wall of the conical pipe in the horizontal direction. When the limiting spring is in a natural state, the conical pipe extends out of the lifting box; a push-pull component for driving the piston rod to slide to extract flue gas is arranged in the box body.

[0013] Optionally, the lifting mechanism includes a motor, a first gear, a second gear, a lead screw and a slide bar; the lead screw is rotatably connected in the box body and the axis of rotation is arranged in the vertical direction. The slide bar is fixedly arranged in the box body and is arranged in parallel and spaced apart from the lead screw. The lifting box is slidably connected to the slide bar, and the lifting box is connected to the lead screw through a lead screw nut; the first gear and the second gear are meshed with each other, and the motor drives the lead screw to rotate through the first gear and the second gear.

[0014] Optionally, a second plugging plate is installed at the axis of the sampling cylinder, and a second spring is sleeved outside the second plugging plate. When the second spring is in a natural state, the second plugging plate closes the sampling cylinder.

[0015] Optionally, the push-pull assembly includes an electric cylinder installed on the upper surface of the top plate. A moving plate is installed at the output end of the electric cylinder. A positioning groove is formed inside the top plate of the box body. A first double-layer plate is fixedly arranged on the outer wall of the moving plate. A second double-layer plate and a third double-layer plate are respectively and fixedly arranged on the outer wall of the moving plate and below the first double-layer plate, and the second double-layer plate is higher than the third double-layer plate. Card slots for inserting the push-pull plate in the vertical direction are formed on the first double-layer plate, the second double-layer plate and the third double-layer plate.

[0016] Optionally, sealing assemblies are installed on the outsides of the two sampling cylinders. The sealing assembly includes a mounting bracket fixedly arranged on the outer wall of the sampling cylinder. An airbag is fixedly arranged on the outer wall of the mounting bracket. A sealing pipe is hermetically installed on the outer wall of the airbag. A sealing ring is embedded at the outer end of the conical pipe. A flexible pipe is hermetically installed on the outer wall of the sealing ring;

[0017] Wherein the flexible pipe is placed inside the lifting box, and a convex block is fixedly arranged on the outer wall of the push-pull plate.

[0018] Optionally, the flexible pipe and the sealing pipe are communicated with each other, and the sealing ring, the flexible pipe and the sealing pipe are communicated with the airbag.

[0019] Optionally, air outlet pipes are installed on the outer walls of the two sampling cylinders. A spring cone plug is installed at the bottom end of the air outlet pipe. Two sampling pipes are installed inside the box body and penetrate through the inside of the flue gas tower. Contact plates are fixedly arranged on the inner walls of the two sampling pipes and in the vertical direction of the two spring cone plugs. A fan is installed at the inner bottom of the box body and below the bottom plate.

[0020] Optionally, the cross sections of the two sampling pipes are both of L-shaped structures, and the air outlet pipe is communicated with the sampling cylinder.

[0021] In summary, compared with the traditional direct sampling or fixed-position pipeline sampling, in this application, an integrated box body is designed inside the flue gas tower. The lifting box drives the two sampling assemblies inside to move from top to bottom. During the descending process, the conical pipe and the air inlet pipe are displaced. First, the second sealing plate can be squeezed to open the sampling cylinder. Then, when the conical pipe and the air inlet pipe are completely closed, the second inner plate will contact the first sealing plate to open the air inlet pipe. The force generated by the descending movement forms a linkage to connect the air inlet pipe, the conical pipe and the sampling cylinder. It can not only sample the flue gas at the top and bottom from top to bottom in sequence, but also form automatic connection and blockage, realizing sampling of flue gas at different positions, facilitating comparison of data at different positions in the later stage, and at the same time can realize automatic connection and blockage, ensuring that the sampled gas is purer and avoiding the gas from mixing randomly inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the best structural schematic diagram provided by the present invention;

[0023] Figure 2 For Figure 1 Schematic diagram of the actual middle box body used in the flue gas tower;

[0024] Figure 3 For Figure 1 Schematic diagram of the distribution of the first through-hole and the second through-hole on the inner wall of the box body shown;

[0025] Figure 4 For Figure 3 Schematic diagram of the enlarged structure at position A shown;

[0026] Figure 5 For Figure 1 Schematic diagram of the installation structure of the lifting mechanism and the lifting box shown;

[0027] Figure 6 For Figure 5 Schematic diagram of the side view structure shown;

[0028] Figure 7 For Figure 4 And Figure 5 Schematic diagram of the working state before the sampling component and the plugging component are connected shown;

[0029] Figure 8 For Figure 7 Schematic diagram of the position plan before the conical tube and the intake pipe are connected shown;

[0030] Figure 9 For Figure 7 And Figure 8 Schematic diagram of the structure after the sampling component and the plugging component are connected shown;

[0031] Figure 10 For Figure 8 Schematic diagram of the enlarged structure at position B shown;

[0032] Figure 11 For Figure 7 Schematic diagram of the working state of the separation of the convex block and the airbag shown;

[0033] Figure 12 For Figure 11 Schematic diagram of the working state of the extrusion of the convex block and the airbag shown;

[0034] Figure 13 For Figure 12 Schematic diagram of the working state of the separation of the convex block and the airbag after sampling by the sampling cylinder shown;

[0035] Figure 14 Schematic diagram of the sulfur dioxide sampling work at the top. Among them, in Figure (a), it is the working state diagram of the moving plate driving the first double-layer plate to extract the top flue gas. Among them, in Figure (b), it is the working state diagram of the moving plate resetting after the top flue gas sampling is completed;

[0036] Figure 15 It is a schematic diagram of the bottom sulfur dioxide sampling operation. Among them, in the figure (c), it is a schematic diagram of the working state when the push-pull plate moves into the second double-layer plate. Among them, in the figure (d), it is a schematic diagram of the working state when the moving plate drives the second double-layer plate to pull the push-pull plate to sample the bottom sulfur dioxide flue gas;

[0037] Figure 16 It is a schematic diagram of the top and bottom sulfur dioxide extraction operation. Among them, in the figure (e), it is a schematic diagram of the working state when the two push-pull plates continuously descend into the third double-layer plate and the second double-layer plate. Among them, in the figure (f), it is a schematic diagram of the working state when the moving plate resets to the initial state, driving the two push-pull plates to reset to extrude the top and bottom sulfur dioxide flue gas in the sampling cylinder;

[0038] Figure 17 For Figure 16 the schematic diagram of the connection structure of the air outlet pipe and the sampling pipe shown;

[0039] Figure 18 For Figure 17 the enlarged schematic diagram of the structure at C shown;

[0040] Explanation of the reference numerals in the attached drawings:

[0041] 1. Box body;

[0042] 2. Lifting mechanism; 21. Motor; 22. First gear; 23. Second gear; 24. Lead screw; 25. Slide bar;

[0043] 3. First through hole; 4. Second through hole;

[0044] 51. Air inlet pipe; 52. First guide wheel; 53. Sealing ring; 54. First sealing plate; 55. Tapered block; 56. First spring;

[0045] 6. Sampling assembly; 61. Sampling cylinder; 62. Piston rod; 63. Push-pull plate; 64. First chute; 65. Second chute; 66. Bottom groove; 67. Limit spring; 68. Tapered pipe; 69. First inner plate; 610. Second inner plate; 611. Second sealing plate; 612. Second spring; 613. Air outlet pipe; 614. Second guide wheel; 615. Spring cone plug;

[0046] 7. Push-pull assembly; 71. Electric cylinder; 72. Moving plate; 73. First double-layer plate; 74. Second double-layer plate; 75. Third double-layer plate;

[0047] 8. Sealing assembly; 81. Mounting bracket; 82. Airbag; 83. Sealing ring; 84. Convex block; 85. Sealing pipe; 86. Hose;

[0048] 9. Sampling tube; 10. Bottom plate; 11. Fan; 12. Flue gas tower; 13. Lifting box; 14. Top plate; 15. Positioning groove; 16. Contact plate. Detailed implementation manner

[0049] The following is a further detailed description of the present application in conjunction with the attached Figure 1-18 drawings.

[0050] The embodiment of the present application discloses a sampling device for detecting the sulfur dioxide content in the flue gas of a flue gas tower; please combine Figures 1 to 10 with a sampling device for detecting the sulfur dioxide content in flue gas, including a box body 1, a lifting mechanism 2 and a lifting box 13;

[0051] The outer wall of the box body 1 is respectively provided with a first through hole 3 and a second through hole 4, and plugging components are installed at the same axis of the first through hole 3 and the second through hole 4 inside the box body 1;

[0052] The top of the box body 1 is installed with a top plate 14, the upper surface of the top plate 14 is installed with a motor 21 by bolts, the output shaft of the motor 21 is keyed to a first gear 22, a second gear 23 is meshed and connected to one side of the first gear 22, a lead screw 24 is keyed to the axis of the second gear 23, and a slide bar 25 is fixed on the lower surface of the top plate 14 and on one side of the lead screw 24;

[0053] Please refer to Figure 5 : The initial position of the lifting box 13 is at the top of the lead screw 24, and the sampling process is to sample the treated flue gas and the untreated flue gas from top to bottom;

[0054] The user can start the motor 21 to control the rotation of the first gear 22. When the first gear 22 rotates, it can meshingly control the second gear 23 to drive the lead screw 24 to rotate. The forward and reverse rotation of the lead screw 24 can control the up and down movement of the lifting box 13, and the lifting box 13 slides up and down along the vertical direction of the slide bar 25. The slide bar 25 can limit the vertical degree of freedom of the lifting box 13.

[0055] The plugging component includes an air inlet pipe 51 fixed on the inner wall of the box body 1. The upper and lower sides of the air inlet pipe 51 are rotatably connected with a first guide wheel 52. A sealing ring 53 is concentrically embedded on the outer wall of the air inlet pipe 51. A first plugging plate 54 is installed at the pipe orifice of the air inlet pipe 51. A conical block 55 is fixed at the axis of the first plugging plate 54. A first spring 56 is sleeved on the outer wall of the first plugging plate 54;

[0056] Inside the lifting box 13, two sampling components 6 are installed. The sampling component 6 includes a sampling cylinder 61 fixed inside the lifting box 13. A piston rod 62 is slidably connected inside the sampling cylinder 61. A push-pull plate 63 is fixed to the outer end of the piston rod 62. First chutes 64 and second chutes 65 are provided inside the lifting box 13 at the upper and lower positions of the sampling cylinder 61. Limit springs 67 are fixed inside both the first chutes 64 and the second chutes 65. A tapered tube 68 is slidably connected inside the first chutes 64 and the second chutes 65 on one side of the limit springs 67. First inner plates 69 and second inner plates 610 are respectively fixed to the inner walls of the tapered tube 68. A second sealing plate 611 is installed at the axis of the sampling cylinder 61. A second spring 612 is sleeved on the outer wall of the second sealing plate 611;

[0057] Second guide wheels 614 are rotatably connected to both the upper and lower sides of the second inner plate 610. A bottom plate 10 is fixed to the bottom of the box body 1.

[0058] Please refer to Figures 1 and Figure 3 : Since the opening positions of the first through hole 3 and the second through hole 4 on the box body 1 are not on the same vertical line, during the process of the lifting box 13 driving the two sampling components 6 inside to descend, because the two sampling components 6 are in the horizontal position, the sampling component 6 in the same vertical direction as the first through hole 3 can be connected to the corresponding blocking component for top flue gas sampling. As the lifting box 13 continues to descend, the sampling component 6 in the same vertical direction as the second through hole 4 can be connected to the corresponding blocking component to sample the flue gas at the bottom.

[0059] Please refer to Figure 4 and Figure 7 : When the tapered tube 68 is descending, the conical surface of the tapered tube 68 will contact the first guide wheel 52 on the intake pipe 51. The continuous descent of the lifting box 13 will generate a downward force, and the downward force will control the tapered tube 68 to continuously be forced on the first guide wheel 52, thereby pushing the tapered tube 68 to slide into the lifting box 13;

[0060] Please refer to Figure 7 and Figure 9 : When the tapered tube 68 slides to the limit position, the outer port of the tapered tube 68 will fit with the outer port of the intake pipe 51 to form the connection between the tapered tube 68 and the intake pipe 51. At the same time, during the process of the tapered tube 68 moving into the lifting box 13, the first inner plate 69 inside the tapered tube 68 will push the second sealing plate 611 to open the sampling cylinder 61, forming the connection between the tapered tube 68 and the sampling cylinder 61.

[0061] Please refer to Figure 7 、 Figure 8 and Figure 10: When the conical tube 68 is descending, not only will the conical surface of the conical tube 68 and the first guide wheel 52 exert force on each other and push, but also when the second inner plate 610 is descending, the second guide wheel 614 on the second inner plate 610 will descend and exert force on the conical block 55, thereby pushing the conical block 55 to control the movement of the first sealing plate 54 to open the intake pipe 51. In this way, the top flue gas entering from the intake pipe 51 will enter the conical tube 68 from the intake pipe 51, and then enter the sampling cylinder 61 from the conical tube 68. In this way, it is possible to sample the sulfur dioxide flue gas after treatment at the top of the flue gas tower 12.

[0062] Similarly, when the lifting box 13 descends to the position of the second through hole 4, the sampling assembly 6 will also form a connection with the blocking assembly in the same linkage process as above to sample the sulfur dioxide flue gas at the bottom.

[0063] The bottom end of the lead screw 24 is rotatably connected to the upper surface of the bottom plate 10, the bottom end of the slide bar 25 is fixedly connected to the bottom plate 10, the lifting box 13 is threadedly connected to the lead screw 24, the lifting box 13 is slidably connected to the slide bar 25, and the axis of the second gear 23 is rotatably connected to the top plate 14.

[0064] Both ends of the first spring 56 are fixedly connected to the first sealing plate 54 and the inner wall of the intake pipe 51, and both ends of the second spring 612 are fixedly connected to the second sealing plate 611 and the inner wall of the sampling cylinder 61.

[0065] Both ends of the limiting spring 67 are fixedly connected to the inner walls of the conical tube 68, the first chute 64 and the second chute 65. The first inner plate 69 is vertically arranged, and the second inner plate 610 is horizontally arranged.

[0066] It can be understood that: due to the provision of the first guide wheel 52 and the second guide wheel 614, compared with the traditional conical contact design, in this case, hard friction can be avoided when the conical tube 68 and the intake pipe 51 are stressed, and hard friction can also be avoided when the second inner plate 610 and the conical block 55 are stressed, ensuring smoother and more stable operation before connection;

[0067] At the same time, the design of the limiting spring 67, the first spring 56 and the second spring 612 can ensure that when the conical tube 68 continues to descend and moves away from the intake pipe 51, the conical tube 68, the first sealing plate 54 and the second sealing plate 611 automatically return to the sealing state, preventing the top flue gas in the intake pipe 51 from flowing into the box body 1, and ensuring that the sulfur dioxide flue gas after sampling is sealed and stored in the sampling cylinder 61.

[0068] This embodiment: Compared with traditional direct sampling or fixed-position pipeline sampling, this case is designed with an integrated box 1 inside the flue gas tower 12. The lifting box 13 drives the two sampling components 6 inside to move from top to bottom. During the descending process, the tapered tapered tube 68 and the air inlet pipe 51 are displaced and moved. In the first step, the second sealing plate 611 can be squeezed to open the sampling tube 61. After that, when the tapered tube 68 and the air inlet pipe 51 are completely closed, the second inner plate 610 will resist the first sealing plate 54 to open the air inlet pipe 51. The force generated by the descending movement forms a linkage to connect the air inlet pipe 51, the tapered tube 68 and the sampling tube 61. Not only can the top and bottom flue gases be sampled in turn from top to bottom, but also automatic connection and blocking can be formed, so that the flue gases at different positions can be sampled, which is convenient for the later comparison of data at different positions. At the same time, automatic connection and blocking can be achieved to ensure that the sampled gas is purer and avoid the gas from flowing randomly in the box 1.

[0069] See also Figure 11 and Figure 16 A push-pull assembly 7 is installed inside the box body 1, and the push-pull assembly 7 includes an electric cylinder 71 installed on the upper surface of the top plate 14, and a movable plate 72 is installed at the output end of the electric cylinder 71. A positioning groove 15 is opened inside the top plate 14, and a first double-layer plate 73 is fixedly provided on the outer wall of the movable plate 72. A second double-layer plate 74 and a third double-layer plate 75 are fixedly provided on the outer wall of the movable plate 72 and located below the first double-layer plate 73, and the second double-layer plate 74 is higher than the third double-layer plate 75.

[0070] See also Figure 14 (a): In the first embodiment, after the sampling tube 61 is connected, the user needs to start the electric cylinder 71 to drive the moving plate 72 to move. During the movement, the moving plate 72 controls the first double-layer plate 73 to clamp the push-pull plate 63 inside to pull the piston rod 62 to move the top smoke to be extracted inside the sampling tube 61;

[0071] Since the inner groove of the first double-layer plate 73 is the same size as the push-pull plate 63 , the push-pull plate 63 will not interfere with the first double-layer plate 73 regardless of whether it is raised or lowered.

[0072] See also Figure 14 (b): After the top smoke extraction is completed, the user needs to control the lifting box 13 to drive the sampling tube 61 to continue to descend to the middle position, and then needs to control the moving plate 72 to return to the initial state.

[0073] See also Figure 15 (c): As the lifting box 13 continues to descend, the push-pull plate 63 will eventually enter the second double-layer plate 74, and the sampling tube 61 is connected at this time.

[0074] See also Figure 15In (d): The user starts the electric cylinder 71 again to push the moving plate 72 to control the third double-layer plate 75 to clamp the internal push-pull plate 63, pull the piston rod 62, and extract the flue gas at the bottom inside the sampling cylinder 61, so that the flue gas at the bottom is also sampled.

[0075] Please refer to Figure 16 In (e): After the flue gas at both positions is sampled, it is necessary to continuously control the two sampling cylinders 61 to continue to descend and enter the second double-layer plate 74 and the third double-layer plate 75 in sequence.

[0076] Please refer to Figure 16 In (f): Finally, the user needs to control the moving plate 72 to reset to the initial state. During the reset process, the two push-pull plates 63 will be pushed to drive the piston rod 62 to squeeze the flue gas at the top and bottom out of the sampling cylinder 61.

[0077] It should be noted that the electric cylinder 71 in the figure is a single design. In actual use, the user can freely set the double electric cylinder 71 design according to the choice to increase stability.

[0078] Sealing components 8 are installed on the outer sides of both sampling cylinders 61. The sealing component 8 includes a mounting frame 81 fixed on the outer wall of the sampling cylinder 61. An airbag 82 is fixed on the outer wall of the mounting frame 81. A sealing pipe 85 is hermetically installed on the outer wall of the airbag 82. A sealing ring 83 is embedded at the outer end of the conical pipe 68. A hose 86 is hermetically installed on the outer wall of the sealing ring 83;

[0079] Among them, the hose 86 is placed inside the bottom groove 66, and a convex block 84 is fixed on the outer wall of the push-pull plate 63.

[0080] The hose 86 and the sealing pipe 85 are interconnected, and the sealing ring 83, the hose 86, and the sealing pipe 85 are in communication with the airbag 82.

[0081] Please refer to Figure 9 and Figure 11 : Before the conical pipe 68 is installed under force, the convex block 84 does not contact the airbag 82, so that the sealing ring 83 does not expand.

[0082] Please refer to Figure 12 : When the conical pipe 68 is connected to the intake pipe 51, the sealing ring 83 will synchronously descend and contact the sealing ring 53. In this way, when the user pulls the push-pull plate 63, the convex block 84 will follow the movement of the push-pull plate 63 into the airbag 82 to squeeze the airbag 82, driving the internal gas to enter the hose 86 through the sealing pipe 85, and then controlling the sealing ring 83 to expand.

[0083] Please refer to Figure 13 : Finally, after the sampling is completed, the convex block 84 is separated from the airbag 82. After the separation, the airbag 82 automatically returns to the initial state, and the sealing ring 83 loses the expanded state.

[0084] It can be understood that since the hose 86 is located inside the bottom groove 66 , the tapered tube 68 will drive the hose 86 to move inside the bottom groove 66 to eliminate interference during the movement.

[0085] This embodiment: Compared with the traditional design, this case adopts the drive of the push-pull component 7 to realize the staged extraction and sampling of the smoke at the bottom and the top, and can also push the two push-pull plates 63 in a linked manner to squeeze out the smoke at different positions in the two sampling tubes 61. Therefore, such a design is convenient for the integrated collection and push-out of smoke, and convenient for automated linkage operation. At the same time, when the push-pull plate 63 pulls the piston rod 62 to extract smoke, it will continuously squeeze the airbag 82 to generate gas to control the expansion of the sealing ring 83. The contact expansion of the sealing ring 83 and the sealing ring 53 can form a secondary seal, eliminating the gap after the conical tube 68 and the intake pipe 51 are connected, ensuring better sealing after the smoke passes through.

[0086] See also Figure 17 and Figure 18 The outer walls of the two sampling tubes 61 are both installed with an air outlet pipe 613, and the bottom end of the air outlet pipe 613 is installed with a spring cone block 615. Two sampling tubes 9 are installed inside the box 1 and pass through the inside of the flue gas tower 12. Contact plates 16 are fixed on the inner walls of the two sampling tubes 9 and in a vertical direction with the two spring cone blocks 615. A fan 11 is installed at the inner bottom of the box 1 and below the bottom plate 10.

[0087] The cross-sections of the two sampling tubes 9 are both "L"-shaped, and the air outlet pipe 613 and the sampling cylinder 61 are connected to each other.

[0088] See also Figure 17 and Figure 18 In the second embodiment, after the two sampling cylinders 61 have completed the smoke sampling at the bottom and the top, they need to continue to descend, and finally the outlet pipe 613 will descend into the interior of the sampling tube 9. With the continuous descent, the spring cone block 615 inside the outlet pipe 613 will move relative to the upper surface of the contact plate 16, so that the spring cone block 615 can rise to open the outlet pipe 613, and after opening, the sampling cylinder 61 and the outlet pipe 613 are connected;

[0089] Then, during the operation of the second embodiment, when the piston rod 62 is pushed, the sulfur dioxide fume in the sampling tube 61 will enter the sampling tube 9 from the outlet pipe 613 , and the user can squeeze and collect the fume at the outer end of the sampling tube 9 .

[0090] In this embodiment, two spring cone plugs 615 that automatically reset and close are arranged in two air outlet pipes 613 on the outer walls of two sampling cylinders 61 for plugging. In this way, they can only be connected and opened with the contact plate 16 during the descending process. Such a design can conveniently connect in a linkage manner to extract flue gas at the top and bottom, and at the same time, it can be mechanically and automatically plugged, improving the airtightness of the sampling cylinder 61.

[0091] Please refer to Figures 1 to 18 , the working principle of a sampling device for detecting the sulfur dioxide content in flue gas provided by the present invention is as follows:

[0092] Step S1: The entire box body 1 is installed on the inner wall of the flue gas tower 12. In this way, the sulfur dioxide flue gas entering from below the box body 1 is the untreated initial flue gas, and the sulfur dioxide flue gas above the box body 1 is the flue gas treated by the flue gas tower 12. The initial position of the lifting box 13 is at the top of the lead screw 24. The sampling process is to sample the treated flue gas and the untreated flue gas from top to bottom. The user can start the motor 21 to control the rotation of the first gear 22. When the first gear 22 rotates, it can engage and control the second gear 23 to drive the lead screw 24 to rotate. The forward and reverse rotation of the lead screw 24 can control the up and down movement of the lifting box 13, and the lifting box 13 slides up and down along the vertical direction of the slide bar 25;

[0093] When the conical tube 68 is descending, the conical surface of the conical tube 68 will contact the first guide wheel 52 on the air inlet pipe 51. The continuous descent of the lifting box 13 will generate a downward force, and the downward force will control the conical tube 68 to continuously receive force on the first guide wheel 52, thereby pushing the conical tube 68 to slide into the interior of the lifting box 13;

[0094] When the conical tube 68 slides to the limit position, the outer port of the conical tube 68 will fit with the outer port of the air inlet pipe 51 to form the connection between the conical tube 68 and the air inlet pipe 51. At the same time, during the process of the conical tube 68 moving into the lifting box 13, the first inner plate 69 inside the conical tube 68 will push the second plugging plate 611 to open the sampling cylinder 61, forming the connection between the conical tube 68 and the sampling cylinder 61;

[0095] Since the opening positions of the first through hole 3 and the second through hole 4 on the box body 1 are not on the same vertical line, during the descent of the lifting box 13 driving the two sampling components 6 inside, because the two sampling components 6 are in the horizontal position, the sampling component 6 in the same vertical direction as the first through hole 3 can be connected to the corresponding plugging component for sampling the top flue gas. As the lifting box 13 continues to descend, the sampling component 6 in the same vertical direction as the second through hole 4 can be connected to the corresponding plugging component to sample the bottom flue gas.

[0096] Step S2: Start the electric cylinder 71 to drive the moving plate 72 to move. During the movement of the moving plate 72, control the first double-layer plate 73 to clamp the push-pull plate 63 inside to pull the piston rod 62 to move and extract the top flue gas inside the sampling cylinder 61. After the extraction of the top flue gas is completed, the user needs to control the lifting box 13 to drive the sampling cylinder 61 to continue to descend to the middle position, and then control the moving plate 72 to reset to the initial state. As the lifting box 13 continues to descend, finally the push-pull plate 63 will enter the second double-layer plate 74. At this time, the sampling cylinder 61 is connected. Start the electric cylinder 71 again to push the moving plate 72 to control the third double-layer plate 75 to clamp the push-pull plate 63 inside to pull the piston rod 62 to extract the bottom flue gas inside the sampling cylinder 61. In this way, the sampling of the bottom flue gas is also completed. After the sampling of the flue gas at both positions is completed, it is also necessary to continuously control the two sampling cylinders 61 to continue to descend and enter the second double-layer plate 74 and the third double-layer plate 75 in sequence. Finally, the user needs to control the moving plate 72 to reset to the initial state. During the reset process, the two push-pull plates 63 will be pushed to drive the piston rod 62 to squeeze the top and bottom flue gases out of the sampling cylinder 61.

[0097] Step S3: After the two sampling cylinders 61 complete the sampling of the bottom and top flue gases, they need to continue to descend. Finally, the outlet pipe 613 will descend into the sampling pipe 9. As it continues to descend, the spring cone plug 615 inside the outlet pipe 613 will move relative to the upper surface of the contact plate 16, so that the spring cone plug 615 can rise to open the outlet pipe 613. After opening, the sampling cylinder 61 is connected to the outlet pipe 613. When the piston rod 62 is pushed, the sulfur dioxide flue gas in the sampling cylinder 61 will enter the sampling pipe 9 from the outlet pipe 613. The user can collect the extruded flue gas at the outer end of the sampling pipe 9.

[0098] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower, characterized in that: It includes a box body, a lifting mechanism and a lifting box; the box body is arranged in the smoke tower; The outer wall of the box body is respectively provided with a first through hole and a second through hole, and both the first through hole and the second through hole are installed with a blocking component to prevent smoke from entering the box body; Two sampling assemblies for extracting smoke are installed inside the lifting box, and the lifting box is connected to the box body by sliding in the vertical direction through a lifting mechanism; The blocking assembly includes an air intake pipe fixedly arranged on the inner wall of the box body, the upper and lower sides of the air intake pipe are rotatably connected with the first guide wheel, the air intake pipe is concentrically embedded with a sealing ring, a first blocking plate is installed at the pipe opening of the air intake pipe, a conical block is fixed at the axis of the first blocking plate, and a first spring is arranged on the outer sleeve of the first blocking plate; when the first spring is in a natural state, the first blocking plate blocks the air intake pipe; The sampling assembly includes a sampling cylinder fixedly arranged inside the lifting box, a piston rod is slidably connected inside the sampling cylinder, a push-pull plate is fixedly arranged at the outer end of the piston rod, a first slide groove and a second slide groove are respectively opened inside the lifting box and located at the upper and lower parts of the sampling cylinder, a limit spring is fixedly arranged inside the first slide groove and the second slide groove, a conical tube is slidably connected inside the first slide groove and the second slide groove, a first inner plate and a second inner plate are respectively fixedly arranged at both ends of the inner wall of the conical tube in the horizontal direction, and when the limit spring is in a natural state, the conical tube extends out of the lifting box; a push-pull assembly for driving the piston rod to slide to extract smoke is arranged in the box body; A second sealing plate is installed at the axis of the sampling tube, and a second spring is disposed on the outer sleeve of the second sealing plate. When the second spring is in a natural state, the second sealing plate closes the sampling tube.

2. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 1, characterized in that: The lifting mechanism includes a motor, a first gear, a second gear, a screw and a sliding rod; the screw is rotatably connected in the box and the rotation axis is arranged in the vertical direction, the sliding rod is fixed in the box and is arranged parallel to the screw, the lifting box is slidably connected to the sliding rod, and the lifting box is connected to the screw through a screw nut; the first gear and the second gear are meshed with each other, and the motor drives the screw to rotate through the first gear and the second gear.

3. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 1, characterized in that: The push-pull assembly includes an electric cylinder installed on the upper surface of the top plate, a movable plate is installed at the output end of the electric cylinder, a positioning groove is opened inside the top plate of the box body, a first double-layer plate is fixedly provided on the outer wall of the movable plate, a second double-layer plate and a third double-layer plate are fixedly provided on the outer wall of the movable plate and located below the first double-layer plate, and the second double-layer plate is higher than the third double-layer plate, and a slot for the push-pull plate to be inserted in the vertical direction is opened on the first double-layer plate, the second double-layer plate and the third double-layer plate.

4. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 3, characterized in that: The outside of the two sampling tubes is equipped with a sealing assembly, which includes a mounting frame fixed on the outer wall of the sampling tube, an air bag fixed on the outer wall of the mounting frame, a sealing tube is sealed on the outer wall of the air bag, a sealing ring is embedded in the outer end of the tapered tube, and a hose is sealed on the outer wall of the sealing ring; The hose is placed inside the lifting box, and a protrusion is fixed on the outer wall of the push-pull plate.

5. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 4, characterized in that: The hose and the sealing tube are communicated with each other, and the sealing ring, the hose, the sealing tube and the airbag are in conduction with each other.

6. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 5, characterized in that: The outer walls of the two sampling tubes are each equipped with an air outlet pipe, and a spring cone block is installed at the bottom end of the air outlet pipe. Two sampling tubes are installed inside the box and pass through the interior of the flue gas tower. Contact plates are fixed on the inner walls of the two sampling tubes and in a vertical direction to the two spring cone blocks. A fan is installed at the inner bottom of the box and below the bottom plate.

7. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 6, characterized in that: The cross sections of the two sampling tubes are both L-shaped, and the air outlet pipe and the sampling cylinder are connected to each other.

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