Sampling device for detecting content of sulfur dioxide in flue gas of flue gas tower

Abstract

The invention discloses a sampling device for detecting the content of sulfur dioxide in flue gas of a flue gas tower. The sulfur dioxide detection device comprises a box body, a lifting mechanism and a lifting box, the box body is arranged in the flue gas tower; a first through hole and a second through hole are formed in the outer wall of the box body, and plugging assemblies are mounted in the first through hole and the second through hole; two sampling assemblies are installed in the lifting box, the lifting box is slidably connected into the box body in the vertical direction through a lifting mechanism, and the lifting mechanism comprises a motor, a first gear, a second gear, a lead screw and a sliding rod; the lead screw is rotationally connected into the box body, the rotating axis is arranged in the vertical direction, the sliding rod is fixedly arranged in the box body, the lifting box is slidably connected with the sliding rod, and the lifting box is connected with the lead screw through a lead screw nut; the motor drives the screw rod to rotate; according to the flue gas sampling device, flue gas at the top and the bottom can be sampled in sequence from top to bottom, meanwhile, automatic connection and blocking can be formed, flue gas at different positions can be sampled, data at different positions can be conveniently compared in the later period, it is guaranteed that sampled gas is purer, and the phenomenon that the gas is disorderly mixed in the box body can be avoided.

Description

Technical Field

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

[0002] Flue gas is generated in existing industrial production, and the most abundant component in 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 and is soluble in water, ethanol and ether. Sulfur dioxide is one of the main pollutants in the atmosphere. In particular, the flue gas tower mainly treats sulfur dioxide gas through fillers or spraying technology during the flue gas treatment process. In order to ensure the safety of the flue gas after treatment, a flue gas sampling device is required for sampling when treating sulfur dioxide in the flue gas tower.

[0003] Announcement No. CN219870519U discloses a chemical gas sampling device. In actual operation, the sampler of the above device can only collect samples at a single position, but the working process of the flue gas tower is from bottom to top, and the untreated flue gas is treated from the bottom to the top. Therefore, it is not convenient to sample the untreated flue gas at the bottom and the treated flue gas at the top at the same time, and it is not convenient for users to compare the sulfur dioxide flue gas at different positions to ensure the effect of the flue gas treatment in the flue gas tower.

[0004] If you want to take samples from the upper and lower parts of the flue gas tower, you need to open sampling tubes that connect the inside and outside and have closed plugs that can be opened at any time at the upper and lower parts of the flue gas tower respectively; it is relatively simple to sample the lower flue gas, but if you want to sample the upper flue gas, you need to manually climb to the top of the flue gas tower for sampling. Considering that the flue gas treatment tower is usually high, this operation method is not only inefficient but also relatively dangerous.

[0005] If the upper sampling tube of the flue gas tower is extended downward, the sampling tube will be longer. After the last sampling is completed and the sampling tube is closed, a large amount of flue gas will remain inside the tube. At this time, the sample for the next upper flue gas sampling is actually the sample remaining after the last sampling. At this time, it is obviously wrong to compare the lower sampling sample with the upper sampling sample, because the sulfur dioxide content of the original flue gas filled into the bottom of the flue tower is constantly changing, so it cannot reflect the real treatment effect of the flue tower. Summary of the invention

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

[0007] The present application provides a sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower, which adopts the following technical solution: A sampling device for detecting sulfur dioxide content in flue gas of a flue gas tower, characterized in that it comprises 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 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 component includes a sampling cylinder fixedly arranged inside the lifting box, the interior of the sampling cylinder is slidably connected with a piston rod, the outer end of the piston rod is fixedly provided with a push-pull plate, the interior of the lifting box and the upper and lower parts of the sampling cylinder are respectively provided with a first slide groove and a second slide groove, the interiors of the first slide groove and the second slide groove are both fixedly provided with limit springs, the interiors of the first slide groove and the second slide groove are slidably connected with a conical tube, the inner walls of the conical tube are respectively fixedly provided with a first inner plate and a second inner plate at both ends in a horizontal direction, when the limit spring is in a natural state, the conical tube extends out of the lifting box; a push-pull component for driving the piston rod to slide to extract smoke is provided in the box body.

[0008] Optionally, 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.

[0009] Optionally, a second sealing plate is installed at the axis of the sampling tube, and a second spring is provided 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.

[0010] Optionally, 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 respectively 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 the first double-layer plate, the second double-layer plate and the third double-layer plate are all provided with card slots for the push-pull plate to be inserted in the vertical direction.

[0011] Optionally, a sealing assembly is installed on the outside of the two sampling tubes, and the sealing assembly includes a mounting frame fixedly mounted on the outer wall of the sampling tube, an air bag is fixedly mounted on the outer wall of the mounting frame, a sealing tube is sealingly mounted 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 sealingly mounted 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.

[0012] Optionally, the hose and the sealing tube are interconnected, and the sealing ring, the hose, the sealing tube and the airbag are in conduction with each other.

[0013] Optionally, an air outlet pipe is installed on the outer walls of the two sampling tubes, a spring cone block is installed on 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 with the two spring cone block, and a fan is installed on the inner bottom of the box and below the bottom plate.

[0014] Optionally, 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.

[0015] To sum up, compared with traditional direct sampling or fixed-position pipeline sampling, the present application is designed with an integrated box inside the flue gas tower. The lifting box drives the two internal sampling components to move from top to bottom. During the descent, the tapered conical tube and the air intake pipe are displaced. In the first step, the second sealing plate can be squeezed to open the sampling tube. After that, when the conical tube and the air intake pipe are completely closed, the second inner plate will resist the first sealing plate to open the air intake pipe. The force generated by the downward movement forms a linkage to connect the air intake pipe, the conical tube and the sampling tube. Not only can the top and bottom flue gases be sampled from top to bottom in turn, but automatic connection and sealing can also be formed at the same time, so that the flue gas 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 sealing can be achieved to ensure that the sampled gas is purer and to avoid the gas from mixing in the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the best structure provided by the present invention; Figure 2 for Figure 1 The actual box shown is used in the schematic diagram of the flue gas tower; Figure 3 for Figure 1 The schematic diagram of the distribution of the first through holes and the second through holes on the inner wall of the box is shown; Figure 4 for Figure 3 The enlarged structural diagram of point A shown; Figure 5 for Figure 1 The schematic diagram of the lifting mechanism and the lifting box installation structure shown; Figure 6 for Figure 5 The side view schematic diagram of the structure shown; Figure 7 for Figure 4 and Figure 5 The working state diagram of the sampling component and the plugging component before being connected; Figure 8 for Figure 7 The plan view of the position of the tapered pipe and the intake pipe before they are connected is shown; Fig. 9 for Figure 7 and Figure 8 The schematic diagram of the structure after the sampling component and the plugging component are connected; Fig.10 for Figure 8 The enlarged structural diagram of point B shown; Fig.11 for Figure 7 The schematic diagram of the working state of the protrusion and the airbag being separated is shown; Fig.12 for Fig.11 The schematic diagram of the bump and airbag extrusion working state shown; Fig.13 for Fig.12 The schematic diagram of the sampling tube showing the working state of the protrusion and the air bag being separated after sampling; Fig.14 Schematic diagram of the top sulfur dioxide sampling operation, wherein (a) is a schematic diagram of the working state of the movable plate driving the first double-layer plate to extract the top flue gas, wherein (b) is a schematic diagram of the working state of the movable plate resetting after the top flue gas sampling is completed; Fig.15 The schematic diagram of the bottom sulfur dioxide sampling operation is shown in FIG. (c) of the figure is a schematic diagram of the working state of the push-pull plate moving into the second double-layer plate, and (d) of the figure is a schematic diagram of the working state of the moving plate driving the second double-layer plate to pull the push-pull plate to sample the bottom sulfur dioxide flue gas; Fig.16 Schematic diagram of the top and bottom sulfur dioxide extraction work, wherein (e) is a schematic diagram of the working state of the two push-pull plates continuously descending into the third double-layer plate and the second double-layer plate, wherein (f) is a schematic diagram of the working state of the moving plate returning to the initial state, driving the two push-pull plates to return to the initial state so that the sulfur dioxide flue gas at the top and bottom of the sampling tube is squeezed out; Fig.17 for Fig.16 Schematic diagram of the connecting structure of the air outlet pipe and the sampling pipe shown; Fig.18 for Fig.17 The enlarged structural diagram of point C is shown.

[0017] Description of Figure Numbers: 1. Box body; 2. Lifting mechanism; 21. Motor; 22. First gear; 23. Second gear; 24. Lead screw; 25. Sliding rod; 3. First through hole; 4. Second through hole; 51. air intake pipe; 52. first guide wheel; 53. sealing ring; 54. first blocking plate; 55. conical block; 56. first spring; 6. Sampling assembly; 61. Sampling tube; 62. Piston rod; 63. Push-pull plate; 64. First slide groove; 65. Second slide groove; 66. Bottom groove; 67. Limit spring; 68. Conical tube; 69. First inner plate; 610. Second inner plate; 611. Second blocking plate; 612. Second spring; 613. Exit pipe; 614. Second guide wheel; 615. Spring cone blocking block; 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; 8. Sealing assembly; 81. Mounting frame; 82. Airbag; 83. Sealing ring; 84. Bump; 85. Sealing tube; 86. Hose; 9. Sampling tube; 10. Bottom plate; 11. Fan; 12. Smoke tower; 13. Lifting box; 14. Top plate; 15. Positioning groove; 16. Contact plate. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-18 This application is described in further detail.

[0019] The present application embodiment discloses a sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower; Figures 1 to 10 , a sampling device for detecting sulfur dioxide content in flue gas, comprising a box body 1, a lifting mechanism 2 and a lifting box 13; The outer wall of the box body 1 is respectively provided with a first through hole 3 and a second through hole 4, and a blocking component is installed inside the box body 1 and at the same axis of the first through hole 3 and the second through hole 4; A top plate 14 is installed on the top of the box body 1, and a motor 21 is installed on the upper surface of the top plate 14 by bolts. A first gear 22 is connected to a keyway of the output shaft of the motor 21, and a second gear 23 is meshed and connected to one side of the first gear 22. A lead screw 24 is connected to a keyway at the axis of the second gear 23, and a slide bar 25 is fixed on the lower surface of the top plate 14 and located on one side of the lead screw 24; See also Figure 5 : The initial position of the lifting box 13 is at the top of the screw 24, and 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 screw 24 to rotate. The forward and reverse rotation of the screw 24 can control the up and down movement of the lifting box 13, and the lifting box 13 slides and rises along the vertical direction of the slide rod 25. The slide rod 25 can limit the vertical freedom of the lifting box 13.

[0020] The blocking assembly includes an air inlet pipe 51 fixedly mounted on the inner wall of the housing 1, the upper and lower sides of the air inlet pipe 51 are rotatably connected with first guide wheels 52, a sealing ring 53 is concentrically embedded in the outer wall of the air inlet pipe 51, a first blocking plate 54 is installed at the pipe opening of the air inlet pipe 51, a conical block 55 is fixedly mounted at the axis of the first blocking plate 54, and a first spring 56 is sleeved on the outer wall of the first blocking plate 54; Two sampling assemblies 6 are installed inside the lifting box 13. The sampling assembly 6 includes a sampling barrel 61 fixedly arranged inside the lifting box 13. A piston rod 62 is slidably connected inside the sampling barrel 61. A push-pull plate 63 is fixedly arranged on the outer end of the piston rod 62. A first slide groove 64 and a second slide groove 65 are provided inside the lifting box 13 and located at the upper and lower parts of the sampling barrel 61. Limit springs 67 are fixedly arranged inside the first slide groove 64 and the second slide groove 65. A conical tube 68 is slidably connected inside the first slide groove 64 and the second slide groove 65 and located on one side of the limit spring 67. A first inner plate 69 and a second inner plate 610 are fixedly arranged on the inner wall of the conical tube 68. A second blocking plate 611 is installed at the axis of the sampling barrel 61. A second spring 612 is sleeved on the outer wall of the second blocking plate 611. The second inner plate 610 is rotatably connected to the second guide wheels 614 at both the upper and lower sides, and the bottom of the box body 1 is fixedly provided with a bottom plate 10 .

[0021] See 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, the lifting box 13 drives the two sampling components 6 inside to descend. Since the two sampling components 6 are in a 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 to perform 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 bottom flue gas.

[0022] See also Figure 4 and Figure 7 : When the conical tube 68 is in the process of descending, the conical surface of the conical tube 68 will contact the first guide wheel 52 on the air intake pipe 51, and the continuous descent of the lifting box 13 will generate a descending force, which will control the conical tube 68 to continuously bear the force on the first guide wheel 52, thereby preventing the conical tube 68 from sliding into the inside of the lifting box 13; See also Figure 7 and Fig. 9 : When the conical tube 68 slides to the extreme position, the outer port of the conical tube 68 will fit together with the outer port of the air inlet pipe 51 to form a connection between the conical tube 68 and the air inlet pipe 51. At the same time, when the conical tube 68 moves into the lifting box 13, the first inner plate 69 inside the conical tube 68 will push the second sealing plate 611 to open the sampling tube 61, thereby forming a connection between the conical tube 68 and the sampling tube 61.

[0023] See also Figure 7 , Figure 8 and Fig.10 : When the conical tube 68 is in the process of descending, not only will the conical surface of the conical tube 68 and the first guide wheel 52 be pushed by each other, but also when the second inner plate 610 is in the process of descending, the second guide wheel 614 on the second inner plate 610 will descend the force-bearing conical block 55, thereby pushing the conical block 55 to control the movement of the first blocking plate 54 to open the air intake pipe 51, so that the top flue gas entering from the air intake pipe 51 will enter the conical tube 68 from the air intake pipe 51, and then enter the sampling tube 61 from the conical tube 68, so that the treated sulfur dioxide flue gas at the top of the flue gas tower 12 can be sampled.

[0024] Similarly, when the lifting box 13 descends to the position of the second through hole 4, the sampling component 6 will also be connected with the blocking component to sample the sulfur dioxide flue gas at the bottom as in the above linkage process.

[0025] 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 rod 25 is fixedly connected to the bottom plate 10, the lifting box 13 and the lead screw 24 are threadedly connected, the lifting box 13 and the slide rod 25 are slidably connected, and the axis of the second gear 23 is rotatably connected to the top plate 14.

[0026] Both ends of the first spring 56 are fixedly connected to the first blocking plate 54 and the inner wall of the air inlet pipe 51 , and both ends of the second spring 612 are fixedly connected to the second blocking plate 611 and the inner wall of the sampling tube 61 .

[0027] Both ends of the limit spring 67 are fixedly connected to the inner walls of the tapered tube 68, the first slide groove 64 and the second slide groove 65. The first inner plate 69 is vertically arranged, and the second inner plate 610 is horizontally arranged.

[0028] It can be understood that: due to the provision of the first guide wheel 52 and the second guide wheel 614, compared with the conventional conical contact design, the present invention can avoid hard friction between the conical pipe 68 and the intake pipe 51 when force is applied, and can also avoid hard friction between the second inner plate 610 and the conical block 55 when force is applied, thus ensuring smoother and more stable operation before connection; At the same time, the design of the limit 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 air inlet pipe 51, the conical tube 68, the first sealing plate 54 and the second sealing plate 611 automatically reset to the blocked state, thereby preventing the top flue gas in the air inlet 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 tube 61.

[0029] 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.

[0030] See also Fig.11 and Fig.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.

[0031] See also Fig.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; 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.

[0032] See also Fig.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.

[0033] See also Fig.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.

[0034] See also Fig.15 (d) in the figure: 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 to pull the piston rod 62 to extract the bottom smoke into the sampling tube 61, so that the bottom smoke is also sampled.

[0035] See also Fig.16 (e) in the figure: After the smoke samples at the two positions are taken, it is necessary to continue to control the two sampling tubes 61 to continue to descend and enter the second double-layer plate 74 and the third double-layer plate 75 in turn.

[0036] See also Fig.16 (f) in the figure: Finally, the user needs to control the movable 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 smoke at the top and bottom out of the sampling tube 61.

[0037] It should be noted that the electric cylinder 71 in the figure is a single design. In actual use, the user can freely set a double electric cylinder 71 design to increase stability.

[0038] The two sampling tubes 61 are both externally installed with a sealing assembly 8, which includes a mounting frame 81 fixedly mounted on the outer wall of the sampling tube 61, an air bag 82 fixedly mounted on the outer wall of the mounting frame 81, a sealing tube 85 sealedly mounted on the outer wall of the air bag 82, a sealing ring 83 embedded in the outer end of the tapered tube 68, and a hose 86 sealedly mounted on the outer wall of the sealing ring 83; The hose 86 is placed inside the bottom groove 66 , and a protrusion 84 is fixedly disposed on the outer wall of the push-pull plate 63 .

[0039] The hose 86 and the sealing tube 85 are connected to each other, and the sealing ring 83, the hose 86, the sealing tube 85 and the airbag 82 are connected to each other.

[0040] See also Fig. 9 and Fig.11 Before the tapered tube 68 is installed under force, the projection 84 does not come into contact with the airbag 82, so that the sealing ring 83 does not expand.

[0041] See also Fig.12: When the conical tube 68 and the air inlet pipe 51 are connected, the sealing ring 83 will synchronously drop and contact the sealing ring 53. In this way, when the user pulls the push-pull plate 63, the protrusion 84 will follow the movement of the push-pull plate 63 and enter the airbag 82 to squeeze the airbag 82, driving the internal gas to pass through the sealing tube 85 into the hose 86, and then control the sealing ring 83 to expand.

[0042] See also Fig.13 : After the final sampling is completed, the protrusion 84 and the airbag 82 are separated, and after the separation, the airbag 82 automatically returns to the initial state, and the sealing ring 83 loses the expansion state.

[0043] 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.

[0044] 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.

[0045] See also Fig.17 and Fig.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.

[0046] 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.

[0047] See also Fig.17 and Fig.18In 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; 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 .

[0048] In this embodiment: the two outlet pipes 613 on the outer walls of the two sampling tubes 61 are provided with spring cone blocking blocks 615 which automatically reset and close for blocking. In this way, they can be connected and opened with the contact plate 16 only during the descending process. This design can be connected in a linked manner to facilitate the removal of smoke from the top and bottom, and can also be mechanically and automatically blocked, thereby improving the airtightness of the sampling tube 61.

[0049] Please refer to Figures 1 to 18 The working principle of a sampling device for detecting sulfur dioxide content in flue gas provided by the present invention is as follows: Step S1: The entire box 1 is installed on the inner wall of the flue gas tower 12, so that the sulfur dioxide flue gas entering from the bottom of the box 1 is the untreated initial flue gas, and the sulfur dioxide flue gas above the box 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 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 mesh and control the second gear 23 to drive the screw 24 to rotate. The forward and reverse rotation of the screw 24 can control the lifting box 13 to move up and down, and the lifting box 13 is lifted and lowered by sliding along the vertical direction of the slide bar 25; When the conical tube 68 is in the process of descending, the conical surface of the conical tube 68 will contact the first guide wheel 52 on the air intake pipe 51, and the continuous descent of the lifting box 13 will generate a downward force, which will control the conical tube 68 to continuously bear the force on the first guide wheel 52, thereby preventing the conical tube 68 from sliding into the inside of the lifting box 13; 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 a connection between the conical tube 68 and the air inlet pipe 51. At the same time, when the conical tube 68 moves into the lifting box 13, the first inner plate 69 inside the conical tube 68 will push the second blocking plate 611 to open the sampling tube 61, so as to form a connection between the conical tube 68 and the sampling tube 61. 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, when the lifting box 13 drives the two sampling components 6 inside to descend, since the two sampling components 6 are in a 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 to perform top smoke 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 bottom smoke.

[0050] Step S2: 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 internal push-pull plate 63 to pull the piston rod 62 to move the top smoke to extract the top smoke inside the sampling tube 61. 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 reset to the initial state. As the lifting box 13 continues to descend, the push-pull plate 63 will eventually enter the second double-layer plate 74. At this time, the sampling tube 61 is connected, and the electric cylinder is started again. 71 pushes the movable plate 72 to control the third double-layer plate 75 to clamp the internal push-pull plate 63 to pull the piston rod 62 to extract the bottom smoke into the sampling tube 61, so that the bottom smoke is also sampled. After the smoke at two positions is sampled, it is necessary to continue to control the two sampling tubes 61 to continue to descend and enter the second double-layer plate 74 and the third double-layer plate 75 in turn. Finally, the user needs to control the movable 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 smoke out of the sampling tube 61.

[0051] Step S3: After the two sampling cylinders 61 complete the flue gas sampling at the bottom and the top, they need to continue to descend, and eventually the air outlet pipe 613 will descend into the interior of the sampling tube 9. With the continuous descent, the spring cone block 615 inside the air 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 air outlet pipe 613. After opening, the sampling cylinder 61 and the air outlet pipe 613 are connected. When the piston rod 62 is pushed, the sulfur dioxide flue gas in the sampling cylinder 61 will enter the sampling tube 9 from the air outlet pipe 613, and the user can squeeze and collect the flue gas at the outer end of the sampling tube 9.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present 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 component includes a sampling cylinder fixedly arranged inside the lifting box, the interior of the sampling cylinder is slidably connected with a piston rod, the outer end of the piston rod is fixedly provided with a push-pull plate, the interior of the lifting box and the upper and lower parts of the sampling cylinder are respectively provided with a first slide groove and a second slide groove, the interiors of the first slide groove and the second slide groove are both fixedly provided with limit springs, the interiors of the first slide groove and the second slide groove are slidably connected with a conical tube, the inner walls of the conical tube are respectively fixedly provided with a first inner plate and a second inner plate at both ends in a horizontal direction, when the limit spring is in a natural state, the conical tube extends out of the lifting box; a push-pull component for driving the piston rod to slide to extract smoke is provided in the box body.

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: A second sealing plate is installed at the axis of the sampling tube, and a second spring is arranged 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.

4. 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.

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 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.

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 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.

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 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.

8. A sampling device for detecting sulfur dioxide content in flue gas from a flue gas tower according to claim 7, 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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