Method and device for flue gas desulfurization by wet process in a rotary kiln

Abstract

This invention relates to a method and apparatus for wet desulfurization of flue gas in a rotary kiln, and relates to the technical field of wet desulfurization of flue gas in rotary kilns. The apparatus includes a shell, flue gas inlet, support frame, collection mechanism, desulfurization shell, spraying mechanism, packing desulfurization mechanism, plate desulfurization mechanism, conveying mechanism, and flue gas outlet. This application addresses the problem that conventional desulfurization structures often employ simple static interception modes, resulting in limited gas-liquid contact areas and short contact times. This makes it difficult to provide a large specific surface area like multi-faceted hollow spherical packing to achieve vigorous mass transfer reactions, leading to insufficient deep absorption capacity of sulfur dioxide in flue gas and difficulty in consistently meeting ultra-low emission standards. Conventional devices lack an effective self-cleaning mechanism for the reaction area. As the reaction continues, a large amount of saturated old slurry gradually adheres to the packing and interception plates. Because it is impossible to achieve high-frequency forced replacement of old and new slurry without shutting down the machine, the effective contact area is blocked and covered.

Description

Technical Field

[0001] This application relates to the technical field of wet desulfurization of rotary kiln flue gas, and in particular to a method and apparatus for wet desulfurization of rotary kiln flue gas. Background Technology

[0002] In current industrial production, rotary kilns are widely used in cement, metallurgy, chemical and other fields, and are core high-temperature calcination equipment. However, during the high-temperature calcination process, rotary kilns produce a large amount of industrial flue gas containing harmful components such as sulfur dioxide and particulate matter. If these flue gases, which have not been deeply treated, are directly discharged into the atmosphere, they will not only form acid rain and damage the ecological environment, but also seriously endanger human health. With the tightening of national environmental protection policies, implementing efficient wet desulfurization deep treatment for industrial kiln flue gas has become an inevitable requirement for enterprises to comply with production regulations.

[0003] Existing wet desulfurization devices, such as Chinese Patent Publication No. CN221131650U, describe a wet desulfurization spray device, belonging to the field of wet desulfurization technology. This device includes a desulfurization box, an air inlet assembly on one side, an exhaust pipe at the top of the other side, a placement rack at the bottom of the other side, a water collection tank at the top of the placement rack, and a water pump at the top of the water collection tank. The water pump's drain pipe is connected to a flexible hose. This wet desulfurization spray device, thanks to its water pump, water collection box, spray pipes, and partition plates, draws lime water from the water collection tank and sprays it downwards through the spray pipes. The three spray pipes provide multiple sprays to the exhaust gas. Simultaneously, the vertically arranged partition plates ensure comprehensive contact between the exhaust gas and the sprayed lime water for desulfurization, preventing sulfur in the exhaust gas from being emitted to the outside and causing environmental pollution.

[0004] The aforementioned technologies employ conventional spray tower structures. However, existing spray tower structures have significant functional limitations in practical applications. On one hand, conventional desulfurization structures often use simple static interception modes, resulting in limited gas-liquid contact areas and short contact times. This makes it difficult to provide a large specific surface area like multi-faceted hollow spherical packing to achieve vigorous mass transfer reactions, leading to insufficient deep absorption capacity of sulfur dioxide in flue gas and difficulty in consistently meeting ultra-low emission standards. On the other hand, conventional devices lack an effective self-cleaning mechanism for the reaction area. As the reaction continues, a large amount of saturated old slurry gradually adheres to the packing and interception plates. Since it is impossible to achieve high-frequency forced replacement of old and new slurry without shutdown, the effective contact area is blocked and covered, causing the desulfurization effect to continuously decline. Therefore, there is still room for improvement beyond the existing technologies. Summary of the Invention

[0005] To improve desulfurization efficiency, this application provides a method and apparatus for wet desulfurization of flue gas in a rotary kiln.

[0006] Firstly, the rotary kiln flue gas wet desulfurization device provided in this application adopts the following technical solution: A rotary kiln flue gas wet desulfurization device includes a shell with a flue gas inlet connected to its left end, the shell being supported by a support frame; a collection mechanism installed at the lower end of the shell to collect falling slurry; a desulfurization shell installed at the upper end of the shell, inside which a spraying mechanism, a packing desulfurization mechanism, and a plate desulfurization mechanism are evenly installed from top to bottom. The rotating spraying mechanism sprays slurry onto the packing and plate desulfurization mechanisms, which then perform secondary wet desulfurization on the incoming flue gas; a conveying mechanism attached to the outside of the desulfurization shell to transport the slurry to the spraying mechanism; and a flue gas outlet installed at the upper end of the desulfurization shell.

[0007] As a preferred embodiment of the present invention, the inside of the smoke inlet is provided with multiple layers of filter screens.

[0008] As a preferred embodiment of the present invention, the collection mechanism includes a collection frame, which is connected to the lower end of the housing. A sealing bottom cover is embedded in the lower end of the collection frame. A filter layer is provided inside the sealing bottom cover. A hydraulic cylinder is connected between the sealing bottom cover and the collection frame. An outlet is provided at the lower end of the sealing bottom cover.

[0009] As a preferred embodiment of the present invention, the spraying mechanism includes a rotating ring, which is horizontally rotatably disposed in an annular groove opened in the desulfurization shell. An annular rack is provided on the outer wall of the rotating ring, and a gear meshing with the annular rack is mounted on the output shaft of a motor. The motor is mounted on the outer wall of the desulfurization shell through a motor mount. A synchronous spraying assembly is slidably disposed up and down inside the rotating ring.

[0010] As a preferred embodiment of the present invention, the synchronous spraying assembly includes a synchronous ring, a sliding groove formed on the inner wall of the synchronous ring, a slider slidably disposed inside the sliding groove, the slider being installed on the inner wall of the rotating ring, a diverter pipe installed in the middle of the synchronous ring, spray heads evenly installed at the lower end of the diverter pipe, a connector connected to the upper end of the diverter pipe, and a snap-fit ​​groove installed at the lower end of the synchronous ring.

[0011] As a preferred embodiment of the present invention, the packing desulfurization mechanism includes a rotating disk, which is horizontally rotated and positioned in the middle of the desulfurization shell. Slide grooves are symmetrically provided at the left and right ends of the rotating disk. Extrusion rods are slidably arranged inside the slide grooves. The ends of scraper ropes that are compressed and tightened with the extrusion rods are connected to the inner wall of the slide grooves. Filter discs that are in contact with the lower end face of the rotating disk are fixedly installed in the desulfurization shell. Top support members that are compressed with the lower end of the extrusion rods are slidably arranged on one side of the bottom of the desulfurization shell.

[0012] As a preferred embodiment of the present invention, a screening screen is built into the upper end of the rotating disk, and the scraping rope is initially in a slack state.

[0013] As a preferred embodiment of the present invention, the extrusion rod is provided with extrusion grooves evenly distributed from top to bottom, the end of the scraper rope passes through the extrusion groove and is connected to the inner wall of the chute, and the upper end of the extrusion rod corresponds to the position of the snap-fit ​​groove.

[0014] As a preferred embodiment of the present invention, the lower end of the top support is equipped with a pressing block, and the lower end slope of the pressing block gradually slopes upward from the outside to the inside.

[0015] As a preferred embodiment of the present invention, the plate desulfurization mechanism includes a movable block, which is horizontally slidably disposed on the outside of the desulfurization shell. A hydraulic cylinder is connected between the movable block and the desulfurization shell. An extrusion component that is extruded and cooperates with the extrusion block is disposed at the upper end of the movable block. The inner side of the movable block is connected to a scraper component via a connecting rod. The scraper component with a U-shaped structure surrounds the retention plate. Through grooves are evenly opened on the retention plate. A retention net is installed in the through grooves. The outer side of the retention plate is connected to a connecting seat via a pin. The connecting seat is installed on the inner wall of the desulfurization shell.

[0016] As a preferred embodiment of the present invention, the conveying mechanism includes a connector, which is fixedly installed inside the desulfurization shell. The right end of the connector is connected to the left end of the diversion component, and the upper and lower positions of the right end of the diversion component are respectively connected to the gas pump and the conveying component.

[0017] As a preferred embodiment of the present invention, the inside of the connector and the plug are connected in an inner and outer sliding sleeve manner, and the upper end of the connector is connected to the diversion assembly through a U-shaped tube.

[0018] As a preferred embodiment of the present invention, the diversion assembly includes a manifold, which is installed inside the desulfurization shell. The upper and lower sides of the right end of the manifold are connected to the connector via connecting pipes. The upper and lower ends of the connector are respectively provided with an air chamber and a slurry chamber. The right end of the air chamber is connected to the air pump. A longitudinal groove connects the upper and lower air chambers and the slurry chamber. A partition plate is slidably arranged inside the longitudinal groove. The upper end of the partition plate is elastically connected to the connector. The lower half of the partition plate is provided with a docking hole. The partition plate at the initial position isolates the slurry chamber. The lower half of the partition plate at the initial height is in an extended state.

[0019] As a preferred embodiment of the present invention, the conveying assembly includes a slurry frame, which is attached to the outer wall of the desulfurization shell and connected to the right end of the slurry chamber via a conveying pump.

[0020] On the other hand, this application provides a desulfurization method for a rotary kiln flue gas wet desulfurization device, the method comprising the following steps: Step 1: Purification and filtration. Connect the flue gas inlet of the rotary kiln to the flue gas inlet, and filter particulate impurities from the incoming flue gas through the flue gas inlet. Step 2: Desulfurization. The purified flue gas enters the interior of the desulfurization shell. The flue gas is initially intercepted and desulfurized by the plate desulfurization mechanism. Then the flue gas enters the packing desulfurization mechanism. The slurry is sent to the spraying mechanism by the conveying mechanism and sprayed onto the packing of the packing desulfurization mechanism. The flue gas and the slurry undergo a mass transfer reaction to absorb sulfur dioxide, thereby completing the deep desulfurization operation. Step 3: Self-cleaning. During desulfurization, the plate desulfurization mechanism completes self-cleaning and simultaneously links with the packing desulfurization mechanism to rotate synchronously with the spraying mechanism, forcibly replacing the surface slurry of the packing in the packing desulfurization mechanism. The old slurry that is replaced falls into the collection mechanism under gravity. Step 4: Output. The desulfurized flue gas enters the next process from the flue gas outlet.

[0021] In summary, this application includes the following beneficial technical effects: 1. This application achieves two-stage wet deep desulfurization of flue gas through the coordinated operation of the spraying mechanism, the packing desulfurization mechanism and the plate desulfurization mechanism. The plate desulfurization mechanism first intercepts and slows down the flue gas and completes the initial desulfurization. The packing desulfurization mechanism uses the packing with a huge specific surface area to extend the residence time of the flue gas and vigorously transfer mass with the slurry. The cooperation of each component effectively ensures the stability of the desulfurization efficiency and the ultra-low emission standard. 2. The packing desulfurization mechanism and the plate desulfurization mechanism set in this application adopt the design concept of linkage extrusion structure. While the plate desulfurization mechanism self-cleans and scrapes away impurities, the linkage top support rises, causing the scraper rope in the packing desulfurization mechanism to become taut and rotate synchronously with the spraying mechanism. Subsequently, without stopping the machine, the circumferentially installed scraper rope can be used to forcibly peel off the saturated old slurry on the surface of the packing, which speeds up the replacement frequency of the new and old slurry and improves the cleaning effect. Attached Figure Description

[0022] Figure 1 This is the process flow diagram of this application.

[0023] Figure 2 This is a schematic diagram of the structure of this application.

[0024] Figure 3 This is a top view of this application.

[0025] Figure 4 This application Figure 3 AA sectional view.

[0026] Figure 5 This application Figure 4A partial schematic diagram.

[0027] Figure 6 This is a schematic diagram of the structure between the rotating disk, the extrusion rod, and the scraper rope of this application.

[0028] Figure 7 This is a structural diagram of the connecting rod, scraping component, retention plate, retention net, and connecting seat in this application.

[0029] Figure 8 This is a cross-sectional view (from left to right) of the branch pipe, spray head, and connector in this application.

[0030] Figure 9 This application Figure 5 A magnified view of the area at point X.

[0031] Figure 10 This application Figure 5 A magnified view of the area at point Y.

[0032] Figure 11 This application Figure 5 A magnified view of the Z-axis.

[0033] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Flue gas inlet; 3. Collection mechanism; 31. Collection frame; 32. Sealing bottom cover; 33. Filter layer; 34. Hydraulic cylinder; 4. Desulfurization shell; 5. Spraying mechanism; 51. Rotating ring; 52. Ring rack; 53. Gear; 54. Motor; 55. Synchronous spraying assembly; 551. Synchronous ring; 552. Diverter pipe; 553. Spray head; 554. Connector; 555. Snap-fit ​​groove; 511. Sliding groove; 6. Packing desulfurization mechanism; 61. Rotating disc; 62. Extrusion rod; 621. Extrusion groove; 63. Scraper rope; 64. Filter disc; 641. Embedded groove; 65. Top support component. ; 651, Extrusion block; 66, Screening mesh; 7, Plate desulfurization mechanism; 71, Movable block; 72, Hydraulic cylinder; 73, Extrusion component; 74, Connecting rod; 75, Scraping component; 76, Retention plate; 77, Retention mesh; 78, Connecting seat; 8, Conveying mechanism; 81, Butt joint; 811, U-tube; 82, Diversion assembly; 821, Manifold; 822, Connecting pipe; 823, Connecting component; 824, Air chamber; 825, Slurry chamber; 826, Partition plate; 827, Butt hole; 83, Air pump; 84, Conveying assembly; 841, Slurry frame; 842, Conveying pump; 9, Flue outlet; 11, Support frame. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.

[0035] This application discloses a rotary kiln flue gas wet desulfurization device. This application performs multiple wet desulfurization processes on the flue gas, which improves the desulfurization efficiency. In addition, the slurry in the desulfurization operation is replaced in a timely manner to maintain the desulfurization effect.

[0036] Reference Figures 1-11 As shown, this embodiment discloses a rotary kiln wet flue gas desulfurization device, including a shell 1, a flue gas inlet 2, a support frame 11, a collection mechanism 3, a desulfurization shell 4, a spraying mechanism 5, a packing desulfurization mechanism 6, a plate desulfurization mechanism 7, a conveying mechanism 8, and a flue gas outlet 9. The left end of the shell 1 is connected to the flue gas inlet 2. The shell 1 is supported by the support frame 11. The collection mechanism 3 is installed at the lower end of the shell 1 to collect the falling slurry. The desulfurization shell 4 is connected to the upper end of the shell 1. The desulfurization shell 4 is equipped with a spraying mechanism 5, a packing desulfurization mechanism 6, and a plate desulfurization mechanism 7, which are evenly installed from top to bottom inside. The spraying mechanism 5 sprays slurry onto the packing desulfurization mechanism 6 and the plate desulfurization mechanism 7 through rotation. The packing desulfurization mechanism 6 and the plate desulfurization mechanism 7 perform secondary wet desulfurization on the incoming flue gas. The conveying mechanism 8 is attached to the outside of the desulfurization shell 4 and conveys the slurry to the spraying mechanism 5 through the conveying mechanism 8. The flue gas outlet 9 is connected to the upper end of the desulfurization shell 4.

[0037] In actual operation, the flue gas inlet of the rotary kiln is connected to the flue gas inlet 2. The flue gas entering through the inlet 2 is filtered for particulate impurities. When the purified flue gas passes through the plate desulfurization mechanism 7, it undergoes interception-type desulfurization. The slurry on the plate desulfurization mechanism 7 reacts with the flue gas. Then, the flue gas passes through the packing desulfurization mechanism 6, where it undergoes a mass transfer reaction with the slurry on the packing material, thereby absorbing sulfur dioxide and completing the deep desulfurization operation. During the desulfurization operation, the plate... The slurry that has been reacted in the surface desulfurization unit 7 and the packing desulfurization unit 6 needs to be replaced in time to maintain the desulfurization effect. Therefore, while the surface desulfurization unit 7 completes self-cleaning, the packing desulfurization unit 6 and the spraying unit 5 are successfully connected by squeezing. Subsequently, the two rotate synchronously, thereby scraping off the surface slurry of the packing in the packing desulfurization unit 6. In conjunction with the new slurry sprayed by the spraying unit 5 above, the gypsum-rich slurry (old slurry) is washed off and falls into the collection unit 3 by gravity.

[0038] Reference Figure 3 As shown, the inside of the smoke inlet 2 is equipped with multiple layers of filter screens, which filter and purify particulate impurities in the smoke.

[0039] Reference Figure 3As shown, the collection mechanism 3 includes a collection frame 31, which is connected to the lower end of the housing 1. A sealing bottom cover 32 is embedded in the lower end of the collection frame 31. A filter layer 33 is provided inside the sealing bottom cover 32. A hydraulic cylinder 34 is connected between the sealing bottom cover 32 and the collection frame 31. An outlet is provided at the lower end of the sealing bottom cover 32.

[0040] During the actual collection process, the old slurry falls into the water pool in the collection frame 31, thus performing a water seal operation. Solid-liquid separation is completed through the filter layer 33. The separated solid gypsum (if the rotary kiln is an ordinary kiln, it is general solid waste; if it is a heavy metal smelting kiln, it is hazardous waste) is transported off-site for comprehensive utilization or handed over to qualified units for treatment. The separated clear liquid can be retained in the water pool.

[0041] Reference Figure 5 , Figure 9 As shown, the spraying mechanism 5 includes a rotating ring 51, which is horizontally rotatably disposed in an annular groove opened in the desulfurization shell 4. An annular rack 52 is provided on the outer wall of the rotating ring 51, and a gear 53 that meshes with the annular rack 51 is mounted on the output shaft of the motor 54. The motor 54 is mounted on the outer wall of the desulfurization shell 4 through a motor base. A synchronous spraying assembly 55 is slidably disposed up and down inside the rotating ring 51.

[0042] Reference Figure 5 , Figure 8 , Figure 9 As shown, the synchronous spraying assembly 55 includes a synchronous ring 551, a sliding groove 511 formed in the inner wall of the synchronous ring 551, a slider that slides up and down inside the sliding groove 511, the slider being installed on the inner wall of the rotating ring 51, a diversion pipe 552 installed in the middle of the synchronous ring 551, spray heads 553 evenly installed at the lower end of the diversion pipe 552, a connector 554 connected to the upper end of the diversion pipe 552, and a snap-fit ​​groove 555 installed at the lower end of the synchronous ring 551.

[0043] During the actual spraying process, the motor 54 drives the gear 53 to rotate. Under the meshing of the gear 53 and the rack 52, the rotating ring 51 rotates horizontally. The synchronous ring 551 rotates synchronously, thereby driving the single-row diversion pipe 552 to rotate. Gas or slurry is sprayed out from the spray head 553, thereby uniformly spraying the packing desulfurization mechanism 6 below.

[0044] Reference Figure 2 , Figure 5 , Figure 6 , Figure 9 , Figure 10As shown, the packing desulfurization mechanism 6 includes a rotating disk 61, which is horizontally rotatably positioned in the middle of the desulfurization shell 4. The rotating disk 61 has symmetrically arranged grooves at its left and right ends. An extrusion rod 62 is slidably mounted inside the groove. The end of a scraper rope 63, which forms a compression tension with the extrusion rod 62, is connected to the inner wall of the groove. A filter disk 64, which is in contact with the lower end of the rotating disk 61, is fixedly installed in the desulfurization shell 4. A top support 65, which forms a compression tension with the lower end of the extrusion rod 62, is slidably mounted on one side of the bottom of the desulfurization shell 4. Embedded grooves 641 are symmetrically arranged at the left and right ends of the filter disk 64. The lower end of the extrusion rod 62 at its initial height extends... The material is inserted into the embedded groove 641, and the horizontal position of the rotating disk 61 is locked by the interlocking of the two. The upper end of the rotating disk 61 has a built-in screening screen 66. The scraper rope 63 is in a relaxed state in the initial state. At this time, the rigid scraper rope 63 does not play a scraping role. The extrusion rod 62 has extrusion grooves 621 evenly opened from top to bottom. The end of the scraper rope 63 passes through the extrusion groove 621 and connects to the inner wall of the chute. The upper end of the extrusion rod 62 corresponds to the position between the interlocking groove 555. The lower end of the top support 65 is equipped with an extrusion block 651. The lower end of the extrusion block 651 has a gradually upward inclined structure from the outside to the inside.

[0045] In actual operation, the rotating disc 61, the screening screen 66, and the filter disc 64 together form a complete cylindrical structure. This cylindrical structure is filled with filler, usually multi-faceted hollow spheres. These fillers have a huge specific surface area (1 cubic meter of filler can provide hundreds of square meters of surface area). The slurry forms an extremely thin "water film" on the surface of the filler (the slurry is limestone / lime slurry). When the flue gas passes through the filler, it is forced to decelerate and flow around along the tortuous gaps. The flue gas and the slurry undergo extremely intense "gas film controlled mass transfer" on the huge surface of the filler. The sulfur dioxide molecules in the flue gas and the slurry only need to pass through the extremely thin gas film to be instantly absorbed by the water film and react chemically with the calcium ions in the water film to generate calcium sulfite (CaSO3·1 / 2H2O). At this time, the air blown in through the spraying mechanism 5 oxidizes it into calcium sulfate (CaSO4·2H2O, i.e., gypsum mud).

[0046] Reference Figure 7 , Figure 10 As shown, the plate desulfurization mechanism 7 includes a movable block 71, which is horizontally slidably disposed on the outside of the desulfurization shell 4. A hydraulic cylinder 72 is connected between the movable block 71 and the desulfurization shell 4. An extrusion member 73 is provided at the upper end of the movable block 71 to extrude and cooperate with the extrusion block 651. The inner side of the movable block 71 is connected to a scraper member 75 through a connecting rod 74. The scraper member 75 with a U-shaped structure surrounds the retention plate 76. Through grooves are evenly opened on the retention plate 76. A retention net 77 is installed in the through grooves. The outer side of the retention plate 76 is connected to a connecting seat 78 through a pin. The connecting seat 78 is installed on the inner wall of the desulfurization shell 4.

[0047] In actual operation, the slurry sprayed by the spraying mechanism 5 passes through the packing desulfurization mechanism 6 and then seeps into the retention plate 76 and the retention net 77. At this time, the retention plate 76 intercepts and slows down the flue gas, prolonging the subsequent desulfurization reaction time. The slurry on the retention net 77 reacts with the flue gas, thereby completing the initial desulfurization operation.

[0048] It is important to note that as the reaction proceeds, the water film on the surface of the packing material becomes filled with the generated gypsum particles. Similarly, the retaining mesh 77 also adheres to gypsum particles and a mixture of slurry (referred to as old slurry). This saturated old slurry has poor desulfurization effect. Therefore, this application requires regular self-cleaning of the packing material and the desulfurization mechanism 7 on the plate surface to ensure that the surface of the packing material is always filled with highly active absorbent slurry, thereby maintaining extremely high desulfurization efficiency. The specific steps are as follows: the hydraulic cylinder 72 drives the movable block 71 and the extrusion piece 73 to move outward synchronously. The connecting rod 74 drives the scraping component 75 to scrape away impurities from the surfaces of the retention plate 76 and retention mesh 77. Simultaneously, the squeezing between the squeezing component 73 and the squeezing block 651 propels the top support component 65 upward. In the initial stage of upward movement, the top support component 65 completely extrudes the lower end of the squeezing rod 62 into the inner groove 641. As it continues to rise, the upper end of the squeezing rod 62 inserts into the snap-fit ​​groove 555 and pushes the synchronous ring 551 to continue rising. (At this time, the synchronous ring 551 and the horizontal position of the rotating disk 61 are locked, and the position of the rotating disk 61 and the filter disk 64 are locked.) (Unlocking) Simultaneously, the rising extrusion rod 62, through the rising extrusion groove 621, arches both ends of the scraper rope 63 upwards, causing the portion of the scraper rope 63 located in the rotating disk 61 to become taut. At this time, the scraper 75 moves onto the connecting seat 78, and the retention plate 76 rotates downwards under gravity to become vertical, facilitating the subsequent fall of the old slurry. Subsequently, the horizontally rotating synchronous ring 551 drives the rotating disk 61 to rotate synchronously, and the taut scraper rope 63 scrapes off the surface of the filler in the cylindrical structure. The scraped-off old slurry falls to the collector. In structure 3, at the same time, new slurry is sprayed downward from the spraying mechanism 5. After the slurry is replaced, the hydraulic cylinder 72 drives the movable block 71, the extrusion part 73, and the scraping part 75 to move inward, thereby scraping the retention plate 76 and the retention net 77 again (due to the previous drop of old slurry, some of it will fall onto the surface of the retention plate 76 and the retention net 77. At this time, the second scraping can remove the old slurry. During the replacement of old and new slurry, the spraying mechanism 5 is in the spraying state, so that the retention plate 76 and the retention net 77 after the two scrapings are re-attached with new slurry).

[0049] Reference Figure 5 , Figure 11As shown, the conveying mechanism 8 includes a connector 81, which is fixedly installed inside the desulfurization shell 4. The right end of the connector 81 is connected to the left end of the diversion component 82. The upper and lower positions of the right end of the diversion component 82 are respectively connected to the gas pump 83 and the conveying component 84. The inside of the connector 81 is connected to the plug connector 554 in an inner and outer sliding sleeve connection. The upper end of the connector 81 is connected to the diversion component 82 through a U-shaped tube 811.

[0050] Reference Figure 5 , Figure 11 As shown, the diversion assembly 82 includes a manifold 821, which is installed inside the desulfurization shell 4. The upper and lower sides of the right end of the manifold 821 are connected to the connector 823 via a connecting pipe 822. The upper and lower ends of the connector 823 are respectively provided with an air chamber 824 and a slurry chamber 825. The right end of the air chamber 824 is connected to the air pump 83. The upper and lower air chambers 824 and the slurry chamber 825 are connected by a longitudinal groove. A partition plate 826 is slidably arranged inside the longitudinal groove. The upper end of the partition plate 826 is elastically connected to the connector 823. The lower half of the partition plate 826 is provided with a docking hole 827. The partition plate 826 in the initial position isolates the slurry chamber 825. The lower half of the partition plate 826 in the initial height is in an extended state.

[0051] Reference Figure 5 , Figure 11 As shown, the conveying assembly 84 includes a slurry frame 841, which is attached to the outer wall of the desulfurization shell 4. The slurry frame 841 is connected to the right end of the slurry chamber 825 through a conveying pump 842.

[0052] In actual transportation, when the old and new slurries are not replaced, this application uses an air pump 83 to deliver gas through the air chamber 824 to the diversion pipe 552, and finally sprays it out from the spray head 553, thereby oxidizing the calcium sulfite obtained from the desulfurization reaction into calcium sulfate. When new slurry needs to be input, the synchronous ring 551 is pushed up by squeezing. At this time, the partition plate 826 rises synchronously, so that the docking hole 827 in the partition plate 826 is aligned with the slurry chamber 825. At this time, the air chamber 824 is blocked by the partition plate 826. The slurry in the slurry frame 841 is delivered through the slurry chamber 825 to the diversion pipe 552 by the delivery pump 842, and finally sprayed out from the spray head 553, thereby spraying the new slurry. In this application, the slurry and gas share a single nozzle structure, and the gas can be used to clean the slurry that may be blocked in the nozzle structure, reducing the possibility of blockage.

[0053] This application also discloses a method for wet desulfurization of flue gas in a rotary kiln, specifically including the following steps: Step 1: Purification and filtration. Connect the flue gas inlet of the rotary kiln to the flue gas inlet 2, and filter particulate impurities from the incoming flue gas through the flue gas inlet 2. Step 2: Desulfurization. The purified flue gas enters the interior of the desulfurization shell 4. The flue gas is initially intercepted and desulfurized by the plate desulfurization mechanism 7. Then the flue gas enters the packing desulfurization mechanism 6. The slurry is sent to the spraying mechanism 5 by the conveying mechanism 8 and sprayed onto the packing of the packing desulfurization mechanism 6. The flue gas and the slurry undergo a mass transfer reaction to absorb sulfur dioxide, thereby completing the deep desulfurization operation. Step 3: Self-cleaning. During desulfurization, the plate desulfurization mechanism 7 completes self-cleaning and simultaneously links the compression packing desulfurization mechanism 6 to rotate synchronously with the spraying mechanism 5, forcibly replacing the surface slurry of the packing in the packing desulfurization mechanism 6. The replaced old slurry falls into the collection mechanism 3 under gravity. Step 4: Output. The desulfurized flue gas enters the next process from the flue gas outlet 9.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A rotary kiln flue gas wet desulfurization device, characterized in that, include: The casing has a smoke inlet connected to its left end, and the casing is supported by a support frame; A collection mechanism, installed at the lower end of the housing, is used to collect the falling slurry. The desulfurization shell is connected and installed at the upper end of the shell. Inside the desulfurization shell, spraying mechanism, packing desulfurization mechanism and plate desulfurization mechanism are evenly installed from top to bottom. The spraying mechanism sprays slurry onto the packing desulfurization mechanism and plate desulfurization mechanism through rotation. The packing desulfurization mechanism and plate desulfurization mechanism perform secondary wet desulfurization operation on the incoming flue gas. The conveying mechanism is attached to the outside of the desulfurization shell and conveys the slurry to the spraying mechanism. The flue gas outlet is connected to the upper part of the desulfurization shell.

2. The rotary kiln flue gas wet desulfurization device according to claim 1, characterized in that: The inside of the smoke inlet is equipped with multiple layers of filter screens; The collection mechanism includes a collection frame, which is connected to the lower end of the housing. A sealing bottom cover is embedded in the lower end of the collection frame. A filter layer is provided inside the sealing bottom cover. A hydraulic cylinder is connected between the sealing bottom cover and the collection frame. A liquid outlet is provided at the lower end of the sealing bottom cover.

3. The rotary kiln flue gas wet desulfurization device according to claim 1, characterized in that: The spraying mechanism includes a rotating ring, which is horizontally rotatably arranged in an annular groove in the desulfurization shell. The outer wall of the rotating ring is provided with an annular rack, and the gear meshing with the annular rack is mounted on the output shaft of the motor. The motor is mounted on the outer wall of the desulfurization shell through a motor mount. A synchronous spraying component is slidably arranged up and down inside the rotating ring.

4. The rotary kiln flue gas wet desulfurization device according to claim 3, characterized in that: The synchronous spraying assembly includes a synchronous ring, a sliding groove on the inner wall of the synchronous ring, a slider that slides up and down inside the sliding groove, the slider being installed on the inner wall of the rotating ring, a diverter pipe installed in the middle of the synchronous ring, spray heads evenly installed at the lower end of the diverter pipe, a connector connected to the upper end of the diverter pipe, and a snap-fit ​​groove installed at the lower end of the synchronous ring.

5. A rotary kiln flue gas wet desulfurization device according to claim 4, characterized in that: The packing desulfurization mechanism includes a rotating disk, which is horizontally rotated and positioned in the middle of the desulfurization shell. Slide grooves are symmetrically opened at the left and right ends of the rotating disk. An extrusion rod is slidably arranged inside the slide groove. The end of the scraper rope that forms a compression tension with the extrusion rod is connected to the inner wall of the slide groove. A filter disk that is in contact with the lower end face of the rotating disk is fixedly installed in the desulfurization shell. A top support that forms a compression with the lower end of the extrusion rod is slidably arranged on one side of the bottom of the desulfurization shell.

6. The rotary kiln flue gas wet desulfurization device according to claim 5, characterized in that: The upper end of the rotating disk has a built-in screening screen, and the scraper rope is initially in a slack state. The extrusion rod has extrusion grooves evenly distributed from top to bottom. The end of the scraper rope passes through the extrusion groove and connects to the inner wall of the chute. The upper end of the extrusion rod corresponds to the position of the snap-fit ​​groove. The lower end of the top support is equipped with a pressing block, and the lower end of the pressing block has a gradually upward sloping structure from the outside to the inside.

7. A rotary kiln flue gas wet desulfurization device according to claim 6, characterized in that: The plate desulfurization mechanism includes a movable block, which is horizontally slidably positioned outside the desulfurization shell. A hydraulic cylinder connects the movable block to the desulfurization shell. An extrusion component that engages with the extrusion block is located at the upper end of the movable block. The inner side of the movable block is connected to a scraper component via a connecting rod. The scraper component with a U-shaped structure surrounds the retention plate. Through slots are evenly distributed on the retention plate, and a retention net is installed in the through slots. The outer side of the retention plate is connected to a connecting seat via a pin. The connecting seat is installed on the inner wall of the desulfurization shell.

8. A rotary kiln flue gas wet desulfurization device according to claim 4, characterized in that: The conveying mechanism includes a connector, which is fixedly installed inside the desulfurization shell. The right end of the connector is connected to the left end of the diversion component. The upper and lower positions of the right end of the diversion component are respectively connected to the gas pump and the conveying component.

9. A rotary kiln flue gas wet desulfurization device according to claim 8, characterized in that: The inside of the connector and the plug are connected in an inner and outer sliding sleeve manner, and the upper end of the connector is connected to the diversion assembly through a U-shaped tube; The diversion assembly includes a manifold, which is installed inside the desulfurization shell. The upper and lower sides of the right end of the manifold are connected to the connector via connecting pipes. The upper and lower ends of the connector are respectively provided with an air chamber and a slurry chamber. The right end of the air chamber is connected to the air pump. The upper and lower air chambers and slurry chambers are connected by a longitudinal groove. A partition plate is slidably installed inside the longitudinal groove. The upper end of the partition plate is elastically connected to the connector. The lower half of the partition plate is provided with a docking hole. The partition plate at the initial position isolates the slurry chamber. The lower half of the partition plate at the initial height is in an extended state. The conveying assembly includes a slurry frame, which is attached to the outer wall of the desulfurization shell. The slurry frame is connected to the right end of the slurry chamber via a conveying pump.

10. A rotary kiln flue gas wet desulfurization device according to any one of claims 1-9, characterized in that: The desulfurization method of the above-mentioned rotary kiln flue gas wet desulfurization device includes the following steps: Step 1: Purification and filtration. Connect the flue gas inlet of the rotary kiln to the flue gas inlet, and filter particulate impurities from the incoming flue gas through the flue gas inlet. Step 2: Desulfurization. The purified flue gas enters the interior of the desulfurization shell. The flue gas is initially intercepted and desulfurized by the plate desulfurization mechanism. Then the flue gas enters the packing desulfurization mechanism. The slurry is sent to the spraying mechanism by the conveying mechanism and sprayed onto the packing of the packing desulfurization mechanism. The flue gas and the slurry undergo a mass transfer reaction to absorb sulfur dioxide, thereby completing the deep desulfurization operation. Step 3: Self-cleaning. During desulfurization, the plate desulfurization mechanism completes self-cleaning and simultaneously links with the packing desulfurization mechanism to rotate synchronously with the spraying mechanism, forcibly replacing the surface slurry of the packing in the packing desulfurization mechanism. The old slurry that is replaced falls into the collection mechanism under gravity. Step 4: Output. The desulfurized flue gas enters the next process from the flue gas outlet.

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