A water film desulfurization device and implementation method thereof

Abstract

A water film desulfurization device and an implementation method thereof, belonging to the technical field of flue gas desulfurization, is designed to solve the problems of poor internal solution filtering effect of existing wet desulfurization spray equipment, easy blockage during the circulation process, and low filtering efficiency; the present invention drives the scraper to move up and down through a driving mechanism and a screw rod, and the scraper cleans the inside of the filter screen when it moves up and down, and when the scraper moves upward, the scraper pushes the guide rod upward to cause the second rotating shaft to rotate, and the second rotating shaft drives the filter screen to rotate half a circle through the first rotating shaft and the connecting shaft, so as to realize the cleaning of the inside and outside of the filter screen, and at the same time, the driving mechanism generates positive pressure inside the inner cavity through the positive and negative pressure mechanism, when the pressure is positive, the one-way valve plate opens, and the water liquid and mixed blockages in the inner cavity are discharged from the one-way valve plate, and when the pressure is negative, the one-way valve plate closes, and the water liquid enters through the filter screen, which can flush the filter screen, prevent the sprayer from being blocked or the spraying effect from being poor, thereby improving the dust removal and desulfurization effects.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas desulfurization, and in particular to a water film desulfurization device and an implementation method thereof. Background Art

[0002] Wet flue gas desulfurization is a method that uses liquid absorbents to remove sulfur dioxide from flue gas. For example, sodium hydroxide is a common desulfurizer that can effectively reduce the sulfur dioxide content in fuels such as coal or oil, helping companies meet environmental protection requirements. The reaction principle of sodium hydroxide and sulfur dioxide is to convert sulfur dioxide into sodium thiosulfate through an acid-base reaction. The specific reaction is: SO2+2NaOH→Na2SO3+H2O. In this process, sodium hydroxide acts as a catalyst, converting sulfur dioxide into a more stable substance.

[0003] At present, the existing wet flue gas desulfurization equipment is equipped with a circulating water tank under it. The solution involved in the reaction flows back to the water tank and then passes through the circulating pump to be sprayed out from the nozzle again.

[0004] For example, the patent with publication number CN104437070A discloses a water film desulfurization spray tower and a water film desulfurization method, wherein a circulating pump outside the spray tower body is connected to a spray system and a sedimentation tank through a pipeline, and a water film filtration system is provided between the spray system and the sedimentation tank, wherein the water film filtration system is composed of a plurality of water film filtration layers connected in sequence and fixed inside the spray tower body;

[0005] The patent with publication number CN107398166A discloses a water-saving flue gas wet desulfurization spray tower, the circulating spray dehydration system includes a desiccant solution spray layer, an enhanced desiccant device, a liquid collecting device, a moisture separator and a desiccant solution storage tank, and the collected desiccant solution is recycled after passing through the moisture separator;

[0006] Before the circulating pump performs circulating spraying, the dust in the flue gas will enter the circulating water tank. The existing filtering equipment has poor filtering effect, which easily causes nozzle clogging and the filtering speed is slow. Summary of the invention

[0007] The purpose of the present invention is to provide a water film desulfurization device and an implementation method thereof, which solves the problems of poor internal solution filtration effect, easy blockage during circulation and low filtration efficiency in the existing wet desulfurization spray equipment in the background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a water film desulfurization device, comprising a tower body and a filter, a circulation pump, a sprayer and a demister arranged inside the tower body, a circulation layer is arranged at the lower part of the tower body, the filter and the circulation pump are arranged inside the circulation layer, the filter comprises a shell, an inner cavity is arranged inside the shell, one side of the inner cavity is open, the circulation pump is connected with the inner cavity through a pipeline, the filter also comprises a filter screen rotatably arranged inside the inner cavity near the opening, a driving mechanism arranged above the inner shell, a positive and negative pressure mechanism arranged on the other side of the shell, a screw rod rotatably arranged inside the shell, and a scraper threadedly connected to the screw rod, and the scraper fits the inner wall of the filter screen;

[0009] The driving mechanism is used to drive the positive and negative pressure mechanism to move, the positive and negative pressure mechanism is used to cause positive pressure and negative pressure to be generated inside the inner cavity, the driving mechanism and the screw are used to drive the scraper to move up and down on the inner side of the filter screen, the scraper is used to clean the inner side of the filter screen, and a ratchet gear set is arranged inside the housing above the filter screen and the scraper, and the ratchet gear set is used to drive the filter screen to rotate half a circle through the movement of the scraper;

[0010] The top of the filter screen is fixedly connected with a connecting shaft, and the ratchet gear set includes a first rotating shaft and a second rotating shaft rotatably connected to the inside of the shell, the first rotating shaft is fixedly connected to the connecting shaft, and the outer side of the first rotating shaft is evenly provided with sliding grooves, the inside of the sliding groove is connected with a toothed plate through a second spring, the cross-section of the toothed plate is a right-angle trapezoid, and the toothed plate is slidably connected in the sliding groove, and the outer side of the second rotating shaft is evenly distributed with tooth grooves corresponding to the toothed plate, the ratchet gear set also includes a guide rod movably arranged in the second rotating shaft, the guide rod passes through the second rotating shaft up and down, and a spiral groove is arranged on the outside of the guide rod, the second rotating shaft is spirally connected to the guide rod, the bottom of the guide rod corresponds to the top of the scraper, a spring groove is arranged on the upper inner part of the shell, a reset spring is fixedly connected between the inner wall of the limit groove and the guide rod, and a one-way valve plate is also arranged at the bottom of the shell;

[0011] The circulation pump generates negative pressure in the inner cavity. When the water enters the inner cavity, it is filtered through the filter. When the filter is blocked and the spraying effect of the sprinkler becomes poor, the circulation pump is turned off and the driving mechanism is started at the same time. The scraper is driven up and down by the driving mechanism and the screw rod. The inside of the filter is cleaned when the scraper moves up and down, and when the scraper moves upward, the scraper pushes the guide rod upward to cause the second rotating shaft to rotate. The second rotating shaft drives the filter to rotate half a circle through the first rotating shaft and the connecting shaft, so as to clean the inside and outside of the filter. At the same time, the driving mechanism generates positive pressure in the inner cavity through the positive and negative pressure mechanism. When the pressure is positive, the one-way valve plate opens, and the water and mixed blockages in the inner cavity are discharged from the one-way valve plate. When the pressure is negative, the one-way valve plate closes, and the water enters through the filter to flush the filter.

[0012] Furthermore, a spray layer is provided inside the tower body above the circulation layer, and the sprayers are provided inside the spray layer, and three groups of sprayers are provided.

[0013] Furthermore, a circulation pipeline is provided between the circulation pump and the three groups of sprayers for circulating and spraying the filtered water.

[0014] Furthermore, an exhaust pipe is installed on the top of the tower body, an air intake pipe is arranged on the side of the tower body, and one end of the air intake pipe is connected to the lower part of the interior of the spray layer, and the other end of the air intake pipe is connected to the smoke exhaust pipe. A dosing barrel is arranged on the side of the tower body, and the dosing barrel is connected to the interior of the circulation layer.

[0015] Furthermore, the driving mechanism includes a motor fixedly arranged on the upper part of the inner part of the shell, and the output end of the motor is fixedly connected to the first sector gear. The driving mechanism also includes a speed increasing gear set and a small spur gear rotatably connected to the inner part of the shell and located on both sides of the first sector gear, and the first sector gear corresponds to the small spur gear, and the bottom of the small spur gear is fixedly connected to the second sector gear. The inner part of the shell is located on the outer side of the second sector gear and is slidably connected with a movable frame, and grooves corresponding to the second sector gear are arranged on both sides of the inner part of the movable frame. A connecting frame is fixedly connected to the movable frame, and the connecting frame is located outside the shell.

[0016] Furthermore, the positive and negative pressure mechanism includes an outer sleeve embedded in the outer wall of the outer shell, and the outer sleeve is connected to the inner cavity. The positive and negative pressure mechanism also includes a piston plate slidably connected to the inner part of the outer sleeve, and the piston plate is fixedly connected to the connecting frame. When the motor drives the first sector gear to engage with the small spur gear, the first sector gear rotates half a circle, and drives the movable frame to reciprocate through the small spur gear and the second sector gear. When the movable frame reciprocates, the piston plate is driven to move left and right inside the outer sleeve through the connecting frame, thereby generating positive pressure and negative pressure in the inner cavity successively.

[0017] Furthermore, the speed increasing gear set includes a speed increasing structure consisting of two groups of pinion gears and one group of large gears, and one group of pinion gears corresponds to the first sector gear, and the driving mechanism also includes a transmission gear set meshingly connected to the other group of pinion gears, and there are two transmission gear sets.

[0018] Furthermore, there are two groups of screw rods, which are respectively located at the front and back of the shell. The top of the screw rod is meshed with the transmission gear group. When the first sector gear is meshed with the speed increasing gear group, the first sector gear rotates half a circle to drive the scraper to move through the speed increasing gear group, the transmission gear group and the screw rod.

[0019] Furthermore, a limiting groove is provided inside the shell below the filter, and a locking structure is movably provided inside the limiting groove, the locking structure includes a rotating shaft fixedly connected to the bottom of the filter, a fixed disk is fixedly connected to the rotating shaft, a limiting block is slidably connected to the bottom of the rotating shaft, a protrusion is provided below the limiting block, and a positioning groove corresponding to the protrusion is provided at the bottom of the limiting groove, a third spring is provided between the fixed disk and the limiting block, when the filter rotates half a circle, the protrusion below the limiting block corresponds to the positioning groove at the bottom of the limiting groove, and under the action of the third spring, the protrusion below the limiting block is embedded in the positioning groove, and since the limiting block is slidably connected to the bottom of the rotating shaft, the rotation range of the filter can be limited.

[0020] Furthermore, a drain port connected to the inner cavity is provided at the bottom of the shell, the one-way valve plate is rotatably provided in the drain port, a preset groove is provided inside the shell, and a first spring is installed between the inner wall at the top of the preset groove and the one-way valve plate. When the inner cavity is under positive pressure, the one-way valve plate flips over and water is discharged from the drain port.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a water film desulfurization device and an implementation method thereof. A circulating pump is operated to generate negative pressure in an inner cavity. When water enters the inner cavity, it is filtered through a filter screen. When the filter screen is blocked and the spraying effect of the sprinkler is deteriorated, the circulating pump is closed and the driving mechanism is started at the same time. The scraper is driven to move up and down by the driving mechanism and the screw rod. The inner side of the filter screen is cleaned when the scraper moves up and down. When the scraper moves upward, the scraper pushes the guide rod upward to cause the second rotating shaft to rotate. The second rotating shaft drives the filter screen to rotate half a circle through the first rotating shaft and the connecting shaft, so as to realize the cleaning of the inside and outside of the filter screen. At the same time, the driving mechanism generates positive pressure in the inner cavity through the positive and negative pressure mechanism. When the pressure is positive, the one-way valve plate is opened, and the water in the inner cavity and the mixed blockages are discharged from the one-way valve plate. When the pressure is negative, the one-way valve plate is closed, and water enters through the filter screen to flush the filter screen, thereby preventing the sprinkler from being blocked or the spraying effect from being deteriorated, thereby improving the dust removal and desulfurization effects. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a schematic diagram of the structure of the filter and the circulating pump of the present invention;

[0025] Figure 3 It is a cross-sectional view of the filter structure of the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified view of the structure at center;

[0027] Figure 5 It is a schematic diagram of the structure of the filter part of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the driving mechanism and the positive and negative pressure mechanism of the present invention;

[0029] Figure 7 It is a schematic diagram of the screw rod, filter screen and locking structure of the present invention;

[0030] Figure 8 It is an exploded view of the ratchet gear set structure of the present invention.

[0031] In the figure: 1, tower body; 11, circulation layer; 12, spray layer; 2, filter; 3, circulation pump; 4, sprayer; 5, demister; 6, exhaust pipe; 7, dosing barrel; 8, air inlet pipe; 21, shell; 211, inner cavity; 212, limit groove; 213, drain port; 214, preset groove; 215, first spring; 216, spring groove; 22, driving mechanism; 221, motor; 222, first sector gear; 223, small spur gear; 224, second sector gear; 225, movable frame; 226, connecting frame; 227, speed increasing gear Wheel set; 228, transmission gear set; 23, positive and negative pressure mechanism; 231, outer sleeve; 232, piston plate; 24, screw rod; 25, scraper; 26, filter screen; 261, connecting shaft; 27, ratchet gear set; 271, first rotating shaft; 272, slide groove; 273, tooth plate; 274, second spring; 275, second rotating shaft; 276, tooth groove; 277, guide rod; 278, reset spring; 28, locking structure; 281, rotating shaft; 282, fixed disk; 283, limit block; 284, third spring; 29, one-way valve 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 order to solve the technical problems of poor filtration effect of the internal solution of the existing wet desulfurization spray equipment, easy blockage during the circulation process, and low filtration efficiency, such as Figure 1-Figure 8 As shown, the following preferred technical solutions are provided:

[0034] like Figure 1As shown, a water film desulfurization device includes a tower body 1 and a filter 2, a circulation pump 3, a sprayer 4 and a demister 5 arranged inside the tower body 1. A circulation layer 11 is arranged at the lower part of the tower body 1, and the filter 2 and the circulation pump 3 are arranged inside the circulation layer 11. Figure 3 and Figure 5 As shown, the filter 2 includes a shell 21, an inner cavity 211 is arranged inside the shell 21, one side of the inner cavity 211 is open, and the circulation pump 3 is connected with the inner cavity 211 through a pipeline. The filter 2 also includes a filter screen 26 rotatably arranged inside the inner cavity 211 near the opening, a driving mechanism 22 arranged above the inner part of the shell 21, a positive and negative pressure mechanism 23 arranged on the other side of the shell 21, a screw rod 24 rotatably arranged inside the shell 21, and a scraper 25 threadedly connected to the screw rod 24, and the scraper 25 fits the inner wall of the filter screen 26;

[0035] The driving mechanism 22 is used to drive the positive and negative pressure mechanism 23 to move, and the positive and negative pressure mechanism 23 is used to promote the generation of positive and negative pressure inside the inner cavity 211. The driving mechanism 22 and the screw rod 24 are used to drive the scraper 25 to move up and down on the inner side of the filter 26. The scraper 25 is used to clean the inner side of the filter 26. A ratchet gear set 27 is provided inside the housing 21 above the filter 26 and the scraper 25. The ratchet gear set 27 is used to drive the filter 26 to rotate half a circle through the movement of the scraper 25.

[0036] like Figure 7-Figure 8 As shown, the top of the filter screen 26 is fixedly connected with a connecting shaft 261, and the ratchet gear set 27 includes a first rotating shaft 271 and a second rotating shaft 275 which are rotatably connected to the inside of the housing 21. The first rotating shaft 271 is fixedly connected to the connecting shaft 261, and the outer side of the first rotating shaft 271 is evenly distributed with a slide groove 272, and the inside of the slide groove 272 is connected with a tooth plate 273 through a second spring 274. The cross section of the tooth plate 273 is a right-angled trapezoid, and the tooth plate 273 is slidably connected in the slide groove 272, and the outer side of the second rotating shaft 275 is evenly distributed with a tooth plate 273. Corresponding to the tooth groove 276, the ratchet gear set 27 also includes a guide rod 277 movably arranged in the second rotating shaft 275, the guide rod 277 passes through the second rotating shaft 275 from top to bottom, and a spiral groove is arranged on the outside of the guide rod 277, the second rotating shaft 275 is spirally connected with the guide rod 277, the bottom of the guide rod 277 corresponds to the top of the scraper 25, a spring groove 216 is arranged on the upper part of the inner part of the shell 21, a return spring 278 is fixedly connected between the inner wall of the limit groove 212 and the guide rod 277, and a one-way valve plate 29 is also arranged below the shell 21;

[0037] The circulation pump 3 is operated to generate negative pressure in the inner cavity 211. When the water enters the inner cavity 211, it is filtered by the filter 26. When the filter 26 is blocked and the spraying effect of the sprinkler 4 is poor, the circulation pump 3 is turned off and the drive mechanism 22 is started at the same time. The drive mechanism 22 and the screw 24 drive the scraper 25 to move up and down. When the scraper 25 moves up and down, it cleans the inside of the filter 26. When the scraper 25 moves upward, the scraper 25 pushes the guide rod 277 upward, prompting the second rotating shaft 275 rotates, and the second rotating shaft 275 drives the filter screen 26 to rotate half a circle through the first rotating shaft 271 and the connecting shaft 261, so as to realize the cleaning of the inside and outside of the filter screen 26. At the same time, the driving mechanism 22 generates positive pressure inside the inner cavity 211 through the positive and negative pressure mechanism 23. When the pressure is positive, the one-way valve plate 29 opens, and the water and mixed blockages in the inner cavity 211 are discharged from the one-way valve plate 29. When the pressure is negative, the one-way valve plate 29 is closed, and the water enters through the filter screen 26 to flush the filter screen 26.

[0038] like Figure 1 As shown, a spray layer 12 is provided inside the tower body 1 above the circulation layer 11 , and the sprayers 4 are provided inside the spray layer 12 , and three groups of sprayers 4 are provided.

[0039] like Figure 1 As shown, a circulation pipeline is provided between the circulation pump 3 and the three groups of sprayers 4 for circulating and spraying the filtered water.

[0040] like Figure 1 As shown, an exhaust pipe 6 is installed on the top of the tower body 1, an air intake pipe 8 is arranged on the side of the tower body 1, and one end of the air intake pipe 8 is connected to the lower part of the interior of the spray layer 12, and the other end of the air intake pipe 8 is connected to the smoke exhaust pipe, and a dosing barrel 7 is arranged on the side of the tower body 1, and the dosing barrel 7 is connected to the interior of the circulation layer 11, and a delivery pump is arranged inside the dosing barrel 7.

[0041] like Figure 6 As shown, the driving mechanism 22 includes a motor 221 fixedly arranged on the upper part of the inner part of the shell 21, and the output end of the motor 221 is fixedly connected to the first sector gear 222. The driving mechanism 22 also includes a speed increasing gear set 227 and a small spur gear 223 rotatably connected to the inner part of the shell 21 and located on both sides of the first sector gear 222, and the first sector gear 222 corresponds to the small spur gear 223, and the bottom of the small spur gear 223 is fixedly connected to the second sector gear 224. The inner part of the shell 21 is located on the outer side of the second sector gear 224 and is slidably connected to a movable frame 225. Grooves corresponding to the second sector gear 224 are arranged on both sides of the inner part of the movable frame 225. A connecting frame 226 is fixedly connected to the movable frame 225, and the connecting frame 226 is located outside the shell 21.

[0042] The positive and negative pressure mechanism 23 includes an outer sleeve 231 embedded in the outer wall of the outer shell 21, and the outer sleeve 231 is connected to the inner cavity 211. The positive and negative pressure mechanism 23 also includes a piston plate 232 slidably connected to the inner part of the outer sleeve 231, and the piston plate 232 is fixedly connected to the connecting frame 226. When the motor 221 drives the first sector gear 222 to engage with the small spur gear 223, the first sector gear 222 rotates half a circle, and drives the movable frame 225 to reciprocate through the small spur gear 223 and the second sector gear 224. When the movable frame 225 reciprocates, it drives the piston plate 232 to move left and right inside the outer sleeve 231 through the connecting frame 226, thereby generating positive pressure and negative pressure in the inner cavity 211 successively.

[0043] like Figure 6 As shown, the speed increasing gear set 227 includes a speed increasing structure consisting of two groups of pinion gears and one group of large gears, and one group of pinion gears corresponds to the first sector gear 222. The driving mechanism 22 also includes a transmission gear set 228 meshingly connected to the other group of pinion gears, and the transmission gear set 228 is provided in two groups.

[0044] like Figure 5 As shown, two groups of screw rods 24 are provided, and are respectively located at the front and rear of the housing 21. The top of the screw rod 24 is meshed with the transmission gear set 228. When the first sector gear 222 is meshed with the speed increasing gear set 227, the first sector gear 222 rotates half a circle to drive the scraper 25 to move through the speed increasing gear set 227, the transmission gear set 228 and the screw rod 24.

[0045] like Figure 4 As shown, a limiting groove 212 is provided inside the housing 21 below the filter 26, and a locking structure 28 is movably provided inside the limiting groove 212. The locking structure 28 includes a rotating shaft 281 fixedly connected to the bottom of the filter 26, a fixed disk 282 is fixedly connected to the rotating shaft 281, and a limiting block 283 is slidably connected to the bottom of the rotating shaft 281. A protrusion is provided below the limiting block 283, and a positioning groove corresponding to the protrusion is provided at the bottom of the limiting groove 212. A third spring 284 is provided between the fixed disk 282 and the limiting block 283. When the filter 26 rotates half a circle, the protrusion below the limiting block 283 corresponds to the positioning groove at the bottom of the limiting groove 212. Under the action of the third spring 284, the protrusion below the limiting block 283 is embedded in the positioning groove. Since the limiting block 283 is slidably connected to the bottom of the rotating shaft 281, the rotation range of the filter 26 can be limited.

[0046] like Figure 3-Figure 5As shown, a drain port 213 communicating with the inner cavity 211 is provided at the bottom of the outer shell 21, and a one-way valve plate 29 is rotatably provided in the drain port 213. A preset groove 214 is provided inside the outer shell 21, and a first spring 215 is installed between the inner wall at the top of the preset groove 214 and the one-way valve plate 29. When the inner cavity 211 is under positive pressure, the one-way valve plate 29 flips over and water is discharged from the drain port 213.

[0047] In order to better illustrate the above embodiment, the present invention provides another technical solution: an implementation method of a water film desulfurization device, comprising the following steps:

[0048] S1: Put the sodium hydroxide solution into the dosing barrel 7, add an appropriate amount of water, and make it into an absorption slurry by stirring or other means, and transport the prepared absorption slurry to the circulation layer 11 of the tower body 1 through the circulation pump 3;

[0049] S2: Flue gas containing sulfur dioxide is introduced into the tower body 1 through the air inlet pipe 8. At the spray layer 12, the sodium hydroxide solution is atomized into fine droplets by the sprayer 4, and contacts with the incoming flue gas in countercurrent. The sulfur dioxide in the flue gas reacts with the sprayed sodium hydroxide solution to generate sodium sulfite and water.

[0050] S3: During the circulation process, the slurry after contact and reaction with the flue gas will return to the circulation layer 11, and the solid particles or impurities in the slurry will be removed by the filter 2 to keep the absorbent clean and efficient. It will be recycled again by the circulation pump 3 to ensure the full utilization of the absorbent. The flue gas after desulfurization will pass through the demister 5 to remove water droplets or mist droplets therein to prevent them from being discharged with the slurry. The clean flue gas after demisting treatment will be discharged into the atmosphere through the exhaust pipe 6.

[0051] The detailed working principle of the filter 2 is as follows: after the circulation pump 3 is turned off, the first sector gear 222 meshes with the speed-increasing gear set 227, and the driving mechanism 22 drives the screw rod 24 to rotate, so that the scraper 25 moves from bottom to top. When the scraper 25 moves, it scrapes and cleans the inside of the filter screen 26. When the scraper 25 reaches the top of the side of the filter screen 26, the scraper 25 continues to move upward, so that the speed-increasing gear set 227 moves upward and drives the second rotating shaft 275 to rotate half a circle. The second rotating shaft 275 meshes with the first rotating shaft 271 and drives the filter screen 26 to rotate half a circle through the connecting shaft 261. After the filter screen 26 rotates half a circle, it is limited by the locking structure 28, and then the screw rod 24 is driven to rotate in the opposite direction through the driving mechanism 22, and the motor 221 rotates half a circle, so that the scraper 25 is reset. When the scraper 25 is reset, the guide rod 277 is reset under the action of the reset spring 278, but since the filter screen 26 is limited at this time and a one-way meshing structure is formed between the second rotating shaft 275 and the first rotating shaft 271, the filter screen 26 will not rotate. When the scraper 25 is reset, the filter screen 26 is cleaned again. After multiple front and back cleanings, the motor 221 drives the first fan gear 222 to mesh with the small spur gear 223. Under the action of the driving mechanism 22 and the positive and negative pressure mechanism 23, positive pressure and negative pressure are generated inside the inner cavity 211. When positive pressure is generated, water is discharged from the drain port 213. When negative pressure is generated, water passes through the filter holes on the surface of the filter screen 26. Under the scraping and flushing action, the filter screen 26 is cleaned, and its final dust removal and desulfurization effects are good.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] The above description 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 water film desulfurization device, comprising a tower body (1) and a filter (2), a circulation pump (3), a sprayer (4) and a demister (5) arranged inside the tower body (1), characterized in that: A circulation layer (11) is arranged at the lower part of the tower body (1), and a filter (2) and a circulation pump (3) are arranged inside the circulation layer (11); the filter (2) comprises a shell (21), an inner cavity (211) is arranged inside the shell (21), one side of the inner cavity (211) is open, and the circulation pump (3) is connected to the inner cavity (211) through a pipeline; the filter (2) further comprises a filter screen (26) rotatably arranged inside the inner cavity (211) near the opening, a driving mechanism (22) arranged at the upper part of the shell (21), a positive and negative pressure mechanism (23) arranged at the other side of the shell (21), a screw rod (24) rotatably arranged inside the shell (21), and a scraper (25) threadedly connected to the screw rod (24), and the scraper (25) is in contact with the inner wall of the filter screen (26); The driving mechanism (22) is used to drive the positive and negative pressure mechanism (23) to move, the positive and negative pressure mechanism (23) is used to cause positive pressure and negative pressure to be generated inside the inner cavity (211), the driving mechanism (22) and the screw rod (24) are used to drive the scraper (25) to move up and down on the inner side of the filter screen (26), the scraper (25) is used to clean the inner side of the filter screen (26), and a ratchet gear set (27) is provided inside the housing (21) above the filter screen (26) and the scraper (25), the ratchet gear set (27) is used to drive the filter screen (26) to rotate half a circle through the movement of the scraper (25); The top of the filter screen (26) is fixedly connected to a connecting shaft (261), and the ratchet gear set (27) comprises a first rotating shaft (271) and a second rotating shaft (275) which are rotatably connected to the inside of the housing (21), the first rotating shaft (271) being fixedly connected to the connecting shaft (261), and the outer side of the first rotating shaft (271) is evenly distributed with sliding grooves (272), the inside of the sliding groove (272) is connected to a tooth plate (273) via a second spring (274), the cross section of the tooth plate (273) is a right-angle trapezoid, and the tooth plate (273) is slidably connected in the sliding groove (272), and the outer side of the second rotating shaft (275) is evenly distributed with springs corresponding to the tooth plate (273). The ratchet gear set (27) further comprises a guide rod (277) movably arranged in the second rotating shaft (275), the guide rod (277) passes through the second rotating shaft (275) from top to bottom, and a spiral groove is arranged on the outside of the guide rod (277), the second rotating shaft (275) and the guide rod (277) are spirally connected, the bottom of the guide rod (277) corresponds to the top of the scraper (25), a spring groove (216) is arranged on the upper part of the inner part of the housing (21), a return spring (278) is fixedly connected between the inner wall of the limit groove (212) and the guide rod (277), and a one-way valve plate (29) is also arranged below the housing (21); The driving mechanism (22) comprises a motor (221) fixedly arranged at the top of the interior of the housing (21), the output end of the motor (221) being fixedly connected to a first sector gear (222), the driving mechanism (22) further comprising a speed increasing gear set (227) and a small spur gear (223) rotatably connected to the interior of the housing (21) and located on both sides of the first sector gear (222), the first sector gear (222) corresponding to the small spur gear (223), the bottom of the small spur gear (223) being fixedly connected to a second sector gear (224), the interior of the housing (21) being slidably connected to an outer side of the second sector gear (224) with a movable frame (225), the interior of the movable frame (225 being provided with grooves corresponding to the second sector gear (224), the movable frame (225) being fixedly connected to a connecting frame (226), the connecting frame (226) being located outside the housing (21); The positive and negative pressure mechanism (23) comprises an outer sleeve (231) mounted on the outer wall of the outer shell (21), the outer sleeve (231) being in communication with the interior of the inner cavity (211), and the positive and negative pressure mechanism (23) further comprises a piston plate (232) slidably connected to the interior of the outer sleeve (231), and the piston plate (232) is fixedly connected to the connecting frame (226); The speed-increasing gear set (227) comprises a speed-increasing structure consisting of two sets of pinion gears and one set of large gears, wherein one set of pinion gears corresponds to the first sector gear (222), and the driving mechanism (22) further comprises a transmission gear set (228) meshingly connected to the other set of pinion gears, and the transmission gear set (228) is provided with two sets; Two groups of the screw rods (24) are provided and are located at the front and rear of the housing (21), respectively. The tops of the screw rods (24) are meshedly connected with the transmission gear set (228); A limiting groove (212) is arranged inside the housing (21) and is located below the filter (26). A locking structure (28) is movably arranged inside the limiting groove (212). The locking structure (28) comprises a rotating shaft (281) fixedly connected to the bottom of the filter (26). A fixing plate (282) is fixedly connected to the rotating shaft (281). A limiting block (283) is slidably connected to the bottom of the rotating shaft (281). A protrusion is arranged below the limiting block (283). A positioning groove corresponding to the protrusion is arranged at the bottom of the limiting groove (212). A third spring (284) is arranged between the fixing plate (282) and the limiting block (283). When the filter (26) rotates half a circle, the protrusion below the limiting block (283) corresponds to the positioning groove at the bottom of the limiting groove (212). The bottom of the housing (21) is provided with a liquid discharge port (213) which is in communication with the interior of the inner cavity (211); the one-way valve plate (29) is rotatably disposed in the liquid discharge port (213); a preset groove (214) is disposed inside the housing (21); and a first spring (215) is installed between the inner wall at the top of the preset groove (214) and the one-way valve plate (29).

2. A water film desulfurization device according to claim 1, characterized in that: A spray layer (12) is also provided inside the tower body (1) above the circulation layer (11), and the sprayers (4) are provided inside the spray layer (12), and three groups of sprayers (4) are provided.

3. A water film desulfurization device as claimed in claim 2, characterized in that: A circulation pipeline is provided between the circulation pump (3) and the three groups of sprayers (4) for circulating and spraying the filtered water liquid.

4. A water film desulfurization device according to claim 1, characterized in that: An exhaust pipe (6) is installed on the top of the tower body (1), an air intake pipe (8) is arranged on the side of the tower body (1), and one end of the air intake pipe (8) is connected to the lower part of the interior of the spray layer (12), and the other end of the air intake pipe (8) is connected to the smoke exhaust pipe. A medicine adding barrel (7) is arranged on the side of the tower body (1), and the medicine adding barrel (7) is connected to the interior of the circulation layer (11).

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