Flue gas denitration and desulfurization integrated equipment applied to sludge combined heat and power generation

Abstract

The flue gas denitration and desulfurization integrated equipment comprises a denitration tower, a desulfurization tower and a dredging mechanism, the denitration tower and the desulfurization tower are communicated with each other, a liquid storage part and a demister are arranged in the desulfurization tower, the outer wall of the liquid storage part is connected with the inner wall of the desulfurization tower through a connecting part, and the dredging mechanism is composed of a driving motor, a lead screw and a pressing plate. The screw rod drives the pressing plate to move up and down through a first sliding piece on the outer wall, a branch pipe communicated with the interior of the liquid storage piece is arranged on one side of the nozzle, a movable rod sliding in the branch pipe is fixed to the lower end of the pressing plate, the outer wall of the end of the movable rod is attached to the inner wall of the branch pipe, and pulse type dredging is formed in the branch pipe through the movable rod. The pressing plate moves up and down to generate adsorption and pressure acting force to drive slurry at the nozzle to move, so that precipitation of the desulfurizer at the nozzle is reduced, and the desulfurizer stably sprayed by the nozzle is enabled to react with sulfur dioxide.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas denitrification and desulfurization in cogeneration, and in particular to an integrated flue gas denitrification and desulfurization device applied to sludge cogeneration. Background Art

[0002] As an important way to utilize renewable energy, biomass combustion has made significant progress in recent years. As people's attention to environmental protection and sustainable development continues to increase, biomass combustion has provided an effective way to rationally utilize biomass resources such as agricultural waste, sludge, and forestry residues, greatly promoting the recycling of resources.

[0003] During the combustion process of sludge, flue gas containing harmful gases such as nitrogen oxides and sulfur dioxide is produced. Therefore, in the existing technology, in order to reduce the emission of nitrogen oxides and sulfur dioxide to the outside, the spraying method is often used. When desulfurization is required, the limestone-gypsum method is often used, that is, the limestone is crushed and ground into powder and then mixed with water to form an absorption slurry. The absorption slurry is allowed to contact and mix with the flue gas in the absorption tower, so that the sulfur dioxide in the flue gas reacts chemically with the calcium carbonate in the slurry and the oxidizing air blown in, thereby being removed. The desulfurized flue gas will flow through the desulfurization tower, and denitrification is achieved by spraying a denitrifying agent above the desulfurization tower. The denitrified flue gas is finally discharged to the outside through the chimney.

[0004] However, the spraying method in the existing technology has obvious defects. After the flue gas is denitrified, it will flow through the desulfurization tower. However, since limestone slurry needs to be sprayed in the desulfurization tower, and the viscosity of the limestone slurry is relatively high, when the slurry is retained in the nozzle or pipeline, the flow rate is reduced to a laminar state, and the particles are prone to form "cake-shaped precipitation" along the wall. Therefore, after the nozzle has been sprayed for a long time, the limestone slurry will precipitate at the nozzle, which will cause the nozzle to be blocked. Once the nozzle is blocked, the flue gas may be discharged directly from the denitrification tower without being fully sprayed and purified, which seriously affects the desulfurization effect of the flue gas, fails to effectively reduce sulfur dioxide emissions, and cannot meet increasingly stringent environmental protection requirements. Summary of the Invention

[0005] In order to reduce the risk of nozzle blockage, an integrated flue gas denitrification and desulfurization equipment for sludge cogeneration is provided.

[0006] The above-mentioned application objectives of this application are achieved through the following technical solutions: An integrated flue gas denitrification and desulfurization device for sludge cogeneration includes a connected denitrification tower and a desulfurization tower. Flue gas to be treated enters the bottom of the desulfurization tower. A liquid storage unit and a demister are sequentially arranged in the desulfurization tower from bottom to top. A gap is left between the outer wall of the liquid storage unit and the inner wall of the desulfurization tower. A connector is provided between the outer wall of the liquid storage unit and the inner wall of the desulfurization tower. A nozzle is provided at the lower end of the liquid storage unit. The dredging mechanism comprises a driving motor located at the top of the desulfurization tower, a screw rod fixed on the output shaft of the driving motor, a first sliding member threadedly connected to the outer wall of the screw rod in the liquid storage member, a pressing plate fixed on the outer wall of the first sliding member, a clearance slot opened on the outer wall of the pressing plate, a limiting member slidably connected to the clearance slot on the inner wall of the liquid storage member, a branch pipe connected to the liquid storage member on one side of the nozzle, and a movable rod fixed to the lower end of the pressing plate and slidably arranged in the branch pipe.

[0007] By adopting the above technical scheme, the flue gas flows into the desulfurization tower after reacting with the denitration agent in the denitration tower to remove nitrogen oxides, the desulfurizer is sprayed from the nozzle to react with the flue gas to remove sulfur dioxide, the dredging mechanism arranged in the desulfurization tower is driven by the driving motor to rotate the screw rod, so that the first sliding member and the pressing plate move up and down in the liquid storage member, when the pressing plate drives the movable rod to rise, the space below the pressing plate increases, and the movable rod is adsorbed to the nozzle through the branch pipe; when the pressing plate drives the movable rod to descend, the space below the pressing plate decreases, and the movable rod exerts pressure on the nozzle through the branch pipe, so that when the nozzle sprays the slurry, the pressing plate moves up and down to generate adsorption and pressure exertion force, which drives the slurry at the nozzle to move, reduces the precipitation of the desulfurizer at the nozzle, ensures that the desulfurizer is stably sprayed from the nozzle to react with sulfur dioxide, and guarantees the desulfurization effect of the desulfurization tower in long-term use.

[0008] Preferably, the desulfurization tower is provided with a baffle on the inner wall, and the length of the baffle in the direction perpendicular to the axis of the desulfurization tower is greater than the distance between the outer wall of the liquid storage member and the inner wall of the desulfurization tower.

[0009] By adopting the above technical scheme, because of the gap between the outer wall of the liquid storage member and the inner wall of the desulfurization tower, the flue gas after reacting with the desulfurizer sprayed from the nozzle can rise above the liquid storage member through the gap, but the flue gas is easy to swing during transportation, and there is a risk that the flue gas rises through the gap without reacting with the desulfurizer, and the baffle can block the flue gas to make the flue gas enter the spraying area of the desulfurizer sprayed from the nozzle, so as to ensure that the flue gas is uniformly sprayed by the desulfurizer, and the sprayed flue gas rises through the gap again, thereby improving the desulfurization effect.

[0010] Preferably, the nozzle is a Venturi nozzle, a narrow contraction section is provided in the middle of the nozzle, and the nozzle is provided with a guide member and a diverter pad from top to bottom, the upper end of the guide member is fixedly connected to the lower surface of the pressure plate, the lower end of the guide member is connected to a conduit passing through the contraction section, a diverter hole is provided on the diverter pad, the inner wall of the diverter pad slides against the outer wall of the conduit, the outer wall of the diverter pad slides against the inner wall of the contraction section, and a first stop member and a second stop member are respectively fixed on the outer wall of the conduit, when the pressure plate is pressed down to the lowest point, the upper surface of the first stop member is flush with the lower end of the contraction section, and when the pressure plate is raised to the highest point, the upper surface of the second stop member is flush with the lower end of the contraction section.

[0011] By adopting the above technical solution, the desulfurizer in the liquid storage part will be sprayed out through the diversion hole in the diversion pad, and the Venturi nozzle can optimize the slurry spraying effect. When the first sliding part drives the pressure plate to press down, the downward pressure of the pressure plate will simultaneously drive the guide part and the conduit to move downward, and then the first stop part will stop the diversion pad from sliding out of the contraction section, and the desulfurizer and some solid precipitates can flow out from the gap between the outer wall of the conduit and the inner wall of the contraction section; when the first sliding part drives the pressure plate to rise, the rising pressure plate will simultaneously drive the guide part and the conduit to rise, and the second stop part will support the diversion pad to slide back into the contraction section, so that the desulfurizer precipitate can flow out from the nozzle, reducing the precipitation of the desulfurizer at the nozzle to clog the nozzle, and further ensuring the stability of the reaction between the desulfurizer sprayed from the nozzle and the sulfur dioxide in the flue gas.

[0012] Preferably, the cross-sections of the first retaining member and the second retaining member in the axial direction of the catheter are smaller than the cross-section of the shunt pad in the axial direction of the catheter.

[0013] By adopting the above technical solution, a diverter hole is opened on the diverter pad. When the first stopper and the second stopper drive the diverter pad to slide in or out of the contraction section, the first stopper and the second stopper reduce the blocking of the desulfurizer from spraying out of the diverter hole, thereby ensuring the stability of the desulfurizer continuously spraying out from the diverter hole.

[0014] Preferably, the flow guide is in the shape of a spiral cone.

[0015] By adopting the above technical solution, the spiral guide piece can make the liquid flow in a spiral shape, guiding the desulfurizer to form a swirl in the nozzle, and then cooperate with the swirl piece to make the liquid rotate in a narrow space, so as to promote more complete contact between the liquid and the flue gas and improve the desulfurization and denitrification effect.

[0016] Preferably, the outer wall of the lead screw is provided with a threaded second sliding member, the second sliding member is located above the demister, the outer wall of the second sliding member is fixed with a water storage member, the outer circumferential side wall of the water storage member is provided with a fixing member, the inner wall of the desulfurization tower is provided with a fixing groove for sliding and clamping the fixing member up and down, the upper end of the desulfurization tower is provided with a water delivery pipe connected with the water storage member, and the water storage member is provided with a cleaning nozzle towards the demister.

[0017] By adopting the above technical scheme, when the demister in the desulfurization tower needs to be cleaned, the delivery of the desulfurizer is stopped, the slurry at the bottom of the desulfurization tower is emptied, the water delivery pipe is opened, the water delivery pipe delivers water towards the water storage member, when the driving motor drives the lead screw to rotate, the lead screw synchronously drives the second sliding member to move up and down, so that the water storage member and the cleaning nozzle move up and down, when rising, the cleaning range of the cleaning nozzle to the demister is expanded, and when descending, the cleaning impact force of the cleaning nozzle to the surface of the demister is enhanced, so that the demister can be cleaned comprehensively, and the demister is prevented from being blocked to affect the flue gas denitrification and desulfurization effect.

[0018] Preferably, the number of cleaning nozzles is multiple, and the cleaning nozzles and the gaps on the demister are one-to-one corresponding.

[0019] By adopting the above technical scheme, multiple cleaning nozzles corresponding to the gaps of the demister can accurately clean the demister, can more effectively remove dirt and impurities on the demister, ensure normal operation of the demister, and further improve the working efficiency and purification effect of the flue gas denitrification and desulfurization integrated equipment.

[0020] Preferably, the upper surface of the liquid storage member is raised towards the demister.

[0021] By adopting the above technical scheme, when the demister is cleaned, part of the cleaned liquid flows along the tower wall to the tower bottom, and the other part flows to the tower bottom through the flow guiding effect of the upper surface of the liquid storage member, so that the liquid flows to the periphery, and the cleaning liquid is prevented from accumulating above the liquid storage member to affect the subsequent demisting effect.

[0022] In summary, the present application has at least one of the following beneficial technical effects: 1. By arranging the dredging mechanism composed of a driving motor, a lead screw, a pressing plate and a movable rod, a dynamic dredging function of the desulfurization tower nozzle is realized, when the pressing plate moves up and down in the inner cavity of the liquid storage member under the driving of the lead screw, the movable rod forms an alternating action of negative pressure adsorption and positive pressure pushing in the branch pipe, effectively breaks the deposition balance of the desulfurizer at the nozzle, prevents the solid particles in the slurry from crystallizing and precipitating in the narrow channel of the nozzle, thereby ensuring that the nozzle continuously and stably outputs the desulfurizer slurry with uniform atomization effect, significantly reducing the risk of flue gas escape caused by nozzle blockage, and maintaining the sulfur dioxide removal efficiency at a high level. 2. The water storage component moves axially along the desulfurization tower via a screw drive mechanism. Multiple nozzles precisely aligned with the demister gaps sequentially complete the comprehensive cleaning of the demister plates. During the ascending phase, the cleaning range is expanded by extending the contact time of the cleaning liquid. During the descending phase, gravity acceleration is used to enhance the flushing impact force, creating a "push-pull" linkage cleaning effect. Combined with the diversion design of the raised surface of the liquid storage component, the cleaning waste liquid can be quickly discharged along the preset path, preventing secondary contamination caused by liquid residue. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the structure between the denitrification tower and the desulfurization tower; Figure 2 for Figure 1 sectional view of Figure 3 Cross-section of the desulfurization tower Figure 1 ; Figure 4 for Figure 3 A local enlarged view at point A; Figure 5 for Figure 3 A partial enlarged view at point B; Figure 6 Cross-section of the desulfurization tower Figure 2 .

[0023] Reference numerals: 1, base; 2, denitrification tower; 21, flue gas pipe; 22, spray pipe; 221, nozzle; 23, liquid delivery pipe; 3, desulfurization tower; 31, liquid storage member; 311, limit member; 32, exhaust pipe; 33, connector; 34, slurry pipe; 35, nozzle; 351, contraction section; 352, flow guide; 353, diverter pad; 3531, diverter hole; 354, conduit; 3541, first stopper; 3542. Second stopper; 36. Baffle; 37. Fixing groove; 4. Dredging mechanism; 41. Driving motor; 42. Pressing plate; 421. Yielding groove; 43. Screw; 431. First thread; 432. Second thread; 44. First sliding member; 45. Branch pipe; 46. Movable rod; 47. Second sliding member; 5. Defogger; 6. Water storage member; 61. Fixing member; 62. Water pipe; 63. Cleaning nozzle. DETAILED DESCRIPTION The following is a further detailed description with reference to the accompanying drawings: As attached Figure 1 and attached Figure 2 As shown, the integrated flue gas denitrification and desulfurization equipment used for sludge cogeneration includes a base 1, a denitrification tower 2, a desulfurization tower 3 and a dredging mechanism 4.

[0024] The denitrification tower 2 is provided with a flue gas pipe 21, a spray pipe 22 and a demister 5 from bottom to top. The flue gas pipe 21 is located in the lower middle part of the denitrification tower 2. The flue gas pipe 21 is connected to the denitrification tower 2. The function of the flue gas pipe 21 is to introduce the flue gas to be treated into the denitrification tower 2. The spray pipe 22 is fixed on the inner wall of the denitrification tower 2. The inside of the spray pipe 22 is a hollow pipe. There are multiple spray pipes 22, and adjacent spray pipes 22 are staggered in a rectangular array. A nozzle 221 is provided at the connection between adjacent spray pipes 22, and the outer wall of the denitrification tower 2 is also provided with an infusion pipe 23 that runs through the denitrification tower 2 and is connected to the spray pipe 22. The spray pipe 22 obtains the denitrification agent through the infusion pipe 23 and sprays the flue gas for denitrification treatment.

[0025] A base 1 is fixedly provided at the bottom of the desulfurization tower 3 to further increase the height of the desulfurization tower 3. The lower middle part of the desulfurization tower 3 is connected to the top of the denitrification tower 2, so that the flue gas that has been denitrified can enter the desulfurization tower 3, and a dust removal device is provided between the denitrification tower 2 and the desulfurization tower 3. The dust removal device is used to remove dust from the flue gas flowing from the denitrification tower 2 through the desulfurization tower 3. The dust removal device is a commonly known product in this field and will not be described in detail here.

[0026] The desulfurization tower 3 is provided with a liquid storage part 31, a demister 5 and a smoke exhaust pipe 32 in sequence from bottom to top.

[0027] The demister 5 is of corrugated plate type and is made of polymer composite materials. The plate spacing is 3-5 mm. The inclination angle between two adjacent demisters 5 is preferably between 45° and 60°, forming an S-shaped airflow channel. The surface of the corrugated plate is hydrophobic treated to reduce droplet adhesion. The demister 5 has a good demisting effect and can remove moisture from the flue gas in the desulfurization tower 3 and the denitrification tower 2. The demister 5 is a commonly known product in this field and will not be described in detail here.

[0028] The exhaust pipe 32 is generally made of high-temperature resistant and corrosion-resistant metal material. The exhaust pipe 32 is arranged at the upper end of the desulfurization tower 3 and is used to discharge the flue gas after denitrification and desulfurization treatment. The exhaust pipe 32 transports the denitrified and desulfurized flue gas to the filtering and purification device, and discharges it to the outside after filtering and purification.

[0029] As attached Figure 3 and attached Figure 4 As shown, the liquid storage component 31 is in the shape of a circular plate, and the interior of the liquid storage component 31 is hollow. There is a gap between the outer wall of the liquid storage component 31 and the inner wall of the desulfurization tower 3, and a connecting component 33 connecting the outer wall of the liquid storage component 31 and the inner wall of the desulfurization tower 3 is provided between the two. The connecting component 33 can be made of a metal rod or a metal sheet. There are two connecting components 33, and the two connecting components 33 are respectively located on the outer wall of the liquid storage component 31, further enhancing the stability of the liquid storage component 31 on the inner wall of the desulfurization tower 3.

[0030] A slurry pipe 34 is also provided on the outer wall of the desulfurization tower 3. One end of the slurry pipe 34 passes through the desulfurization tower 3 and is connected to the liquid storage part 31, and the end is connected to the bottom end of the liquid storage part 31. The other end of the slurry pipe 34 is located outside the desulfurization tower 3. The slurry pipe 34 is used to transport desulfurizer into the liquid storage part 31.

[0031] The dredging mechanism 4 also includes a drive motor 41 and a pressure plate 42. The drive motor 41 is located at the top of the desulfurization tower 3. A screw rod 43 is fixed on the output shaft of the drive motor 41. The end of the screw rod 43 at the top of the desulfurization tower 3 passes through the desulfurization tower 3 and extends downward into the liquid storage part 31. The screw rod 43 is generally made of metal to ensure its strength and wear resistance.

[0032] The end of the screw rod 43 is located on the outer wall inside the liquid storage part 31, and is provided with a first thread 431 and a first sliding part 44 threadedly connected to the first thread 431. The first sliding part 44 is cylindrical, and the two ends of the first thread 431 are respectively between the upper surface and the lower surface inside the liquid storage part 31. Therefore, when the driving motor 41 drives the screw rod 43 to drive the first sliding part 44 to move up and down, it can limit the distance of the first sliding part 44 sliding up and down.

[0033] The pressure plate 42 is in the shape of a circular plate and is fixedly connected to the outer wall of the first sliding member 44. A clearance groove 421 is provided on the outer peripheral side wall of the pressure plate 42. A limiting member 311 is provided on the inner wall of the liquid storage member 31 and is slidably engaged with the clearance groove 421. The limiting member 311 is in the shape of a long strip. The cooperation between the limiting member 311 and the clearance groove 421 can limit the rotation of the pressure plate 42 in the circumferential direction, so that the first sliding member 44 can only drive the pressure plate 42 to move up and down.

[0034] As attached Figure 3 and attached Figure 5 As shown, the lower surface of the liquid storage member 31 is provided with a nozzle 35, which is used to spray a desulfurizing agent to desulfurize the flue gas. The nozzle 35 is a Venturi nozzle 35. There are multiple nozzles 35, which are distributed in an array on the lower surface of the liquid storage member 31. A narrow contraction section 351 is provided in the middle of the nozzle 35. The nozzle 35 is provided with a guide member 352 and a diversion pad 353 from bottom to top. The guide member 352 is a spiral cone and is made of metal. The spiral guide member 352 is made of metal. The flow member 352 can make the liquid flow in a spiral shape, guiding the desulfurizer to form a vortex in the nozzle 35. The upper end of the guide member 352 is fixedly connected to the lower surface of the pressure plate 42, and the lower end of the guide member 352 is connected to the conduit 354. The end of the conduit 354 extends downward and passes through the contraction section 351. The diameter of the conduit 354 is smaller than the distance between the inner walls of the contraction section 351, ensuring that the pressure plate 42 can synchronously drive the guide member 352 and the conduit 354 to move up and down during the up and down movement.

[0035] The desulfurizer is guided by the spiral guide member 352 and reaches the diverter pad 353. The diverter pad 353 is annular and made of soft material. A plurality of diverter holes 3531 are provided on the diverter pad 353. The desulfurizer in the liquid storage member 31 can be sprayed out from the diverter holes 3531. The outer wall of the diverter pad 353 slides against the inner wall of the contraction section 351, and the inner wall of the diverter pad 353 slides against the outer wall of the conduit 354.

[0036] The outer wall of the conduit 354 is respectively fixed with a first stopper 3541 and a second stopper 3542. The first stopper 3541 and the second stopper 3542 are both annular. When the pressing plate 42 is pressed down to the lowest point, the upper surface of the first stopper 3541 is flush with the lower end of the contraction section 351. When the pressing plate 42 is raised to the highest point, the upper surface of the second stopper 3542 is flush with the lower end of the contraction section 351, and the first stopper 3541 is flush with the lower end of the contraction section 351. The cross-section of the second stopper 3542 in the axial direction of the conduit 354 is smaller than the cross-section of the diverter pad 353 in the axial direction of the conduit 354. When the first stopper 3541 and the second stopper 3542 drive the diverter pad 353 to slide in or out of the contraction section 351, the first stopper 3541 and the second stopper 3542 are reduced to block the desulfurizer from spraying out of the diverter hole 3531, thereby ensuring the stability of the desulfurizer continuously spraying out from the diverter hole 3531.

[0037] When the first sliding member 44 drives the pressure plate 42 downward, the downward movement of the pressure plate 42 will simultaneously drive the guide member 352 and the conduit 354 downward, and then the first stop member 3541 will stop the diverter pad 353 from sliding out of the contraction section 351, and the desulfurizer and some solid precipitates can flow out from the gap between the outer wall of the conduit 354 and the inner wall of the contraction section 351; when the first sliding member 44 drives the pressure plate 42 to rise, the rise of the pressure plate 42 will simultaneously drive the guide member 352 and the conduit 354 to rise, and the second stop member 3542 will support the diverter pad 353 to slide back into the contraction section 351.

[0038] One side of the nozzle 35 is provided with a branch pipe 45 in communication with the liquid storage member 31, and the lower end of the pressing plate 42 is further fixed with a movable rod 46 penetrating the liquid storage member 31 and sliding in the branch pipe 45. One section of the branch pipe 45 is vertically arranged to allow the movable rod 46 to slide up and down, and the other end of the branch pipe 45 is obliquely arranged in communication with the converging section 351. The end of the movable rod 46 is usually provided with a sealing gasket in actual work, and the outer wall of the end of the movable rod 46 is in close contact with the inner wall of the branch pipe 45. When the pressing plate 42 drives the movable rod 46 to descend, the space below the pressing plate 42 decreases, the desulfurizer in the branch pipe 45 is compressed by the movable rod 46, and the desulfurizer is pushed to pass through the nozzle 35 at high speed. When the pressing plate 42 drives the movable rod 46 to ascend, the space below the pressing plate 42 increases, and the negative pressure suction force makes the desulfurizer flow back to wash the inner wall of the nozzle 35, forming a pulse cleaning. The upward and downward movement of the pressing plate 42 generates adsorption and pressure application force, drives the desulfurizer at the nozzle 35 to move, reduces the desulfurizer precipitation in the nozzle 35, ensures that the desulfurizer is stably sprayed out of the nozzle 35 to react with sulfur dioxide, and ensures the long-term desulfurization effect of the desulfurization tower 3.

[0039] A baffle 36 is arranged on the inner wall of the desulfurization tower 3. The baffle 36 is annular in shape. Since the temperature of the reaction in the desulfurization tower 3 is usually between 800° and 1300°, the baffle 36 is made of a high-temperature-resistant material such as metal. The length of the baffle 36 in the direction perpendicular to the axis of the desulfurization tower 3 is greater than the distance between the liquid storage member 31 and the desulfurization tower 3. The included angle between the lower surface of the baffle 36 and the inner wall of the desulfurization tower 3 is between 0° and 180°, and is preferably between 30° and 60°. The baffle 36 is arranged at an acute angle with the flow direction of the flue gas, thereby prolonging the time length of the flue gas staying in the desulfurization tower 3. Since there is a gap between the outer wall of the liquid storage member 31 and the inner wall of the desulfurization tower 3, the flue gas after the desulfurizer reaction sprayed through the nozzle 35 will rise above the liquid storage member 31 through the gap. However, the flue gas is easy to swing with the wind during transportation, and there is a risk that the flue gas will rise through the gap without reacting with the desulfurizer. The baffle 36 changes the flow path of the flue gas, so that the flue gas enters the spraying area of the desulfurizer sprayed through the nozzle 35, increases the contact time and contact area of the flue gas and the desulfurizer, and ensures that the flue gas is uniformly sprayed by the desulfurizer. The sprayed flue gas rises through the gap again, further optimizing the effect of flue gas desulfurization.

[0040] As shown in FIG. 1, the desulfurization tower 3 is provided with a liquid storage member 31, a nozzle 35, a pressing plate 42, and a baffle 36. Figure 6As shown, a second thread 432 and a second sliding member 47 threadedly connected to the second thread 432 are fixed on the outer wall of the screw rod 43, both ends of the second thread 432 are located above the demister 5, and the vertical distance between the lower end of the second thread 432 and the demister 5 is preferably 5-10 mm, the second sliding member 47 is cylindrical, and a water storage member 6 distributed in a matrix cross is fixed on the outer wall of the second sliding member 47, a fixing member 61 is provided on the outer peripheral side wall of the water storage member 6, and a fixing member 61 is provided on the inner wall of the desulfurization tower 3. A fixing groove 37 is provided for the fixing part 61 to slide up and down and engage. The fixing part 61 is strip-shaped. The cooperation between the fixing part 61 and the fixing groove 37 can limit the rotation of the water storage part 6 in the circumferential direction. A water pipe 62 is provided on the top of the desulfurization tower 3. One end of the water pipe 62 passes through and slides on the top of the desulfurization tower 3 and is connected to the water storage part 6. The other end of the water pipe 62 is connected to the water pump outside the desulfurization tower 3. When the water storage part 6 slides up and down, it can synchronously drive the water pipe 62 at the upper end to move up and down synchronously.

[0041] A cleaning nozzle 63 is provided on the side of the water storage part 6 facing the demister 5. There are multiple cleaning nozzles 63, and the cleaning nozzles 63 correspond one to one to the gaps on the demister 5. The axis of the cleaning nozzle 63 and the gap plane between the adjacent demisters 5 are preferably at an angle of 45° to ensure that the cleaning liquid covers the entire plate surface. When the screw 43 rotates, the second sliding part 47 will move up and down along the second thread 432, driving the water storage part 6 and the cleaning nozzle 63 to clean the demister 5 to prevent the demister 5 from being blocked.

[0042] When it is necessary to clean the demister 5 in the desulfurization tower 3, the delivery of the desulfurizer is stopped, and the slurry at the bottom of the desulfurization tower 3 is drained. The water pump outside the water pipe 62 is turned on, and the water pipe 62 delivers water toward the water storage part 6. When the drive motor 41 drives the screw rod 43 to rotate, the screw rod 43 synchronously drives the second sliding part 47 to move up and down, so that the water storage part 6 and the cleaning nozzle 63 move up and down accordingly. When rising, the cleaning range of the cleaning nozzle 63 on the demister 5 is expanded, and when descending, the cleaning impact force of the cleaning nozzle 63 on the surface of the demister 5 is enhanced, so that the demister 5 can be fully cleaned to prevent the demister 5 from being blocked and affecting the flue gas denitrification and desulfurization effect.

[0043] As attached Figure 3 As shown, the upper surface of the liquid storage part 31 is raised toward the demister 5. When the demister 5 is cleaned, part of the cleaned liquid flows to the bottom of the tower along the tower wall, and the other part flows to the bottom of the tower through the diversion effect of the upper surface of the liquid storage part 31, which can make the liquid flow to the periphery and avoid the cleaning liquid accumulating above the liquid storage part 31 and affecting the subsequent demisting effect.

[0044] In this embodiment, the flue gas flow path is: Flue gas from the sludge incinerator enters the bottom of the denitrification tower 2 through the flue gas pipe 21. The spray pipe 22 delivers denitrification agent (urea solution) through the liquid delivery pipe 23. The atomized spray contacts the flue gas in countercurrent. Under the action of the catalyst, nitrogen oxides (NOx) in the flue gas react with NH3 produced by the decomposition of urea to undergo a selective catalytic reduction reaction (SCR). After being sprayed by the spray pipe 22, the flue gas passes through the demister 5 in the denitrification tower 2 to remove the carried droplets. After denitrification, the flue gas enters the lower middle part of the desulfurization tower 3 through the connecting channel between the denitrification tower 2 and the desulfurization tower 3. The Venturi nozzle 35 below the liquid storage part 31 sprays the desulfurizer (limestone slurry) to contact with the flue gas in countercurrent. The baffle 36 guides the flue gas into the spraying area of ​​the nozzle 35, prolonging the reaction time and improving the desulfurization efficiency. After passing through the spraying area of ​​the nozzle 35, the flue gas will rise through the gap between the liquid storage part 31 and the desulfurization tower 3. The flue gas then passes through the demister 5 in the desulfurization tower 3 to remove the droplets generated by the atomized desulfurizer. The purified flue gas enters the subsequent purification device (such as a wet electrostatic precipitator) through the exhaust pipe 32 and finally meets the emission standards.

[0045] The implementation principle of this embodiment is as follows: The driving motor 41 starts to drive the screw rod 43 to rotate. When the screw rod 43 rotates, it will drive the first sliding member 44 to move up and down. The up and down movement of the first sliding member 44 will synchronously drive the pressure plate 42 to move up and down. When the pressure plate 42 descends, the space below the pressure plate 42 is reduced, and the movable rod 46 compresses the desulfurizer in the branch pipe 45, pushing the desulfurizer through the nozzle 35 at high speed. The spiral guide member 352 and the conduit 354 will also descend synchronously, and then the first stop member 3541 will stop the diverter pad 353 from sliding out of the contraction section 351, and the desulfurizer and some solid The sediment can flow out from the gap between the outer wall of the conduit 354 and the inner wall of the contraction section 351; when the pressure plate 42 rises, the space below the pressure plate 42 increases, and the negative pressure suction causes the desulfurizer to flow back, flushing the inner wall of the nozzle 35, forming a pulse cleaning. The second stopper 3542 will support the diverter pad 353 to slide back into the contraction section 351. The up and down movement of the pressure plate 42 generates adsorption and pressure forces, reducing the precipitation of the desulfurizer in the nozzle 35, ensuring that the nozzle 35 stably sprays the desulfurizer to react with sulfur dioxide, and ensuring the long-term desulfurization effect of the desulfurization tower 3; As the screw 43 rotates, it will drive the second sliding part 47 to move up and down, and the water storage part 6 on the outer wall of the second sliding part 47 will move up and down synchronously. When the demister 5 needs to be cleaned of scale, the water pump outside the water pipe 62 can be turned on, and the water storage part 6 will spray out cleaning liquid through the cleaning nozzle 63. The water storage part 6 moves axially along the desulfurization tower 3 through the screw 43 transmission mechanism. Multiple nozzles 221 that precisely correspond to the gaps between the demister 5 complete the comprehensive cleaning of the demister 5 plates in turn. The cleaning range is expanded by extending the contact time of the cleaning liquid in the ascending stage, and the flushing impact force is enhanced by the acceleration of gravity in the descending stage. Combined with the diversion design of the raised surface of the liquid storage part 31, the cleaning waste liquid can be quickly discharged along the preset path to prevent secondary pollution caused by liquid residue.

[0046] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of protection required by this application, they are protected by patent law.

Claims

1. An integrated flue gas denitrification and desulfurization device for sludge cogeneration, comprising a denitrification tower (2) and a desulfurization tower (3) connected to each other, wherein the flue gas to be treated enters the bottom of the desulfurization tower (3), and is characterized in that: The desulfurization tower (3) is provided with a liquid storage member (31) and a demister (5) in order from bottom to top, a gap is left between the outer wall of the liquid storage member (31) and the inner wall of the desulfurization tower (3), and a connecting member (33) is provided between the outer wall of the liquid storage member (31) and the inner wall of the desulfurization tower (3) to connect the two, and a nozzle (35) is provided at the lower end of the liquid storage member (31); The dredging mechanism (4) further comprises a driving motor (41) located at the top of the desulfurization tower (3), a screw rod (43) being fixed on the output shaft of the driving motor (41), an end of the screw rod (43) passing through the desulfurization tower (3) and extending downward into the liquid storage part (31), a first sliding part (44) being threadedly connected is provided on the outer wall of the screw rod (43) located in the liquid storage part (31), and a pressure plate (44) is fixed on the outer wall of the first sliding part (44) 42), a clearance groove (421) is formed on the outer wall of the pressing plate (42), a limiting member (311) is provided on the inner wall of the liquid storage member (31) and is slidably engaged with the clearance groove (421), a branch pipe (45) is provided on one side of the nozzle (35) and is connected to the liquid storage member (31), a movable rod (46) is fixed at the lower end of the pressing plate (42) and slides in the branch pipe (45), and the outer wall of the end of the movable rod (46) is in contact with the inner wall of the branch pipe (45).

2. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 1 is characterized in that: A baffle (36) is provided on the inner wall of the desulfurization tower (3), and the length of the baffle (36) in a direction perpendicular to the axis of the desulfurization tower (3) is greater than the distance between the outer wall of the liquid storage member (31) and the inner wall of the desulfurization tower (3).

3. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 1 is characterized in that: The nozzle (35) is a Venturi nozzle (35), and a narrow contraction section (351) is provided in the middle of the nozzle (35). The nozzle (35) is provided with a flow guide (352) and a diverter pad (353) from top to bottom. The upper end of the flow guide (352) is fixedly connected to the lower surface of the pressure plate (42), and the lower end of the flow guide (352) is connected to a conduit (354) passing through the contraction section (351). The diverter pad (353) is provided with a diverter hole (3531). The inner wall of the diverter pad (353) slides against the guide. The outer wall of the tube (354) and the outer wall of the diverter pad (353) are slidably abutted against the inner wall of the contraction section (351), and a first stopper (3541) and a second stopper (3542) are respectively fixed on the outer wall of the conduit (354). When the pressure plate (42) is pressed down to the lowest position, the upper surface of the first stopper (3541) is flush with the lower end of the contraction section (351). When the pressure plate (42) is raised to the highest position, the upper surface of the second stopper (3542) is flush with the lower end of the contraction section (351).

4. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 3 is characterized in that: The cross-sections of the first retaining member (3541) and the second retaining member (3542) in the axial direction of the conduit (354) are smaller than the cross-section of the diverter pad (353) in the axial direction of the conduit (354).

5. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 3 is characterized in that: The flow guide (352) is in the shape of a spiral cone.

6. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 1 is characterized in that: A second sliding member (47) connected by a thread is provided on the outer wall of the screw rod (43), and the second sliding member (47) is located above the demister (5). A water storage member (6) is fixed on the outer wall of the second sliding member (47), and a fixing member (61) is provided on the outer peripheral side wall of the water storage member (6). A fixing groove (37) for the fixing member (61) to slide up and down is provided on the inner wall of the desulfurization tower (3). A water pipe (62) connected to the water storage member (6) is provided at the upper end of the desulfurization tower (3), and a cleaning nozzle (63) is provided on the side of the water storage member (6) facing the demister (5).

7. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 6 is characterized in that: There are multiple cleaning nozzles (63), and the cleaning nozzles (63) correspond one to one with the gaps on the demister (5).

8. The integrated flue gas denitrification and desulfurization equipment for sludge cogeneration according to claim 6 is characterized in that: The upper surface of the liquid storage member (31) is raised toward the demister (5).

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