A waste incineration flue gas denitration and dust removal integrated device

Abstract

The present application relates to the field of flue gas treatment equipment, and particularly relates to a garbage incineration flue gas denitration and dust removal integrated equipment, which comprises a dust remover and a denitration tower connected in series, two spraying mechanisms arranged in an upper and lower manner are arranged in the denitration tower, and the spraying mechanisms are regularly self-cleaned, in the present application, during the denitration operation, the spraying pipe is horizontally arranged outside the lower part of the central cylinder to continuously spray the reagent, during the self-cleaning, the spraying pipe is vertically arranged in the central cylinder, the cleaning liquid is introduced into the central cylinder through the sealing hopper, then the spraying pipe is continuously positively and reversely rotated, so that the spraying pipe is soaked in the cleaning liquid and stirred, the washing principle of the washing machine is simulated to realize the automatic and efficient cleaning, the design enables the spraying pipe to complete the online self-cleaning without disassembling the equipment and without manually entering the tower, the maintenance frequency of the spraying pipe is greatly reduced, so that the shutdown cleaning time is significantly shortened, and the continuous operation rate of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment equipment, specifically an integrated denitrification and dust removal device for waste incineration flue gas. Background Technology

[0002] Waste incineration flue gas is a high-temperature dust-laden gas with an extremely complex composition. It contains a large amount of incompletely burned organic viscous substances, such as tar, asphaltene, molten polymers, and unburned oily substances. Within the denitrification reaction temperature range, these viscous substances will precipitate in large quantities, forming a gel-like substance with extremely strong adhesive force. This substance can firmly bind fly ash particles in the flue gas and gradually accumulate into a hard and dense composite scale layer. This unique high viscosity characteristic is the root cause of unstable operation, high failure rate, and high maintenance costs of waste incineration flue gas treatment equipment.

[0003] Existing flue gas treatment equipment generally uses a series of dust collectors and denitrification towers to treat flue gas. Among them, the denitrification towers mostly adopt a counter-current reaction structure: flue gas enters the tower body from the inlet flue at the bottom of the denitrification tower, flows from bottom to top under the action of the induced draft fan, and is evenly distributed in the tower by the gas distribution structure; the denitrification reagents are sprayed from top to bottom through fixed spray pipes installed in the upper or middle part of the denitrification tower. The reagent droplets after being atomized by the nozzles come into counter-current contact with the rising flue gas in the tower and mix, reacting the nitrogen oxides in the flue gas into harmless nitrogen and water.

[0004] However, the existing denitrification towers have significant technical defects when treating highly viscous waste incineration flue gas. The nozzles of the fixed spray pipes are directly exposed to the highly viscous flue gas environment for a long time. When the flue gas flows around the pipes, viscous fly ash and complex scale layers will continuously accumulate on the outer wall of the pipes and near the nozzles. Actual operation shows that 30% to 50% of the nozzles will become clogged after 3 to 6 months of operation. In severe cases, it can even lead to the failure of the entire reagent distribution pipe. Among the various components of the denitrification tower, the spray pipes require 5 to 10 times more maintenance than the gas distribution structure. It is the core component with the highest failure rate and the largest maintenance workload.

[0005] When the spray pipes become clogged, the machine must be shut down for cleaning. The existing cleaning method requires operators to enter the sealed tower for manual cleaning, which is not only labor-intensive and has high safety risks, but also causes a production interruption of 3 to 7 days each time the machine is shut down for cleaning, which seriously affects the continuous operation rate and production efficiency of the equipment. Since the maintenance frequency of the traditional spray structure is much higher than that of the air distribution structure, the large amount of manual maintenance work caused by the frequent clogging of the spray structure is still a key bottleneck restricting the long-term stable operation of the denitrification and dust removal system.

[0006] Therefore, there is an urgent need for a denitrification and dust removal device that can effectively solve the problem of spray pipe blockage and significantly reduce the frequency and time of operation and maintenance, so as to improve the overall efficiency of waste incineration flue gas treatment. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an integrated denitrification and dust removal device for waste incineration flue gas, including a dust collector and a denitrification tower connected in series, and two spraying mechanisms arranged vertically inside the denitrification tower, which perform self-cleaning at regular intervals.

[0008] The spraying mechanism includes a central cylinder fixedly connected to the axis of the denitrification tower. Several spray pipes are installed inside the central cylinder through a connecting assembly. During denitrification operation, the spray pipes are horizontally arranged on the lower outer side of the central cylinder and continuously spray the agent. During self-cleaning, the spray pipes are vertically retracted into the central cylinder.

[0009] The spraying mechanism also includes a support cylinder fixedly connected to the axis of the denitrification tower and located at the bottom of the central cylinder. A sealing hopper is connected to the support cylinder through a drive assembly. During self-cleaning, the sealing hopper seals against the bottom of the central cylinder and introduces the cleaning liquid into the central cylinder. Then, the spraying pipe is continuously rotated in both directions, so that the spraying pipe is immersed in the cleaning liquid and continuously agitated.

[0010] With the help of the spray pipes for timed automatic cleaning, the denitrification and dust removal operations of the waste incineration flue gas are carried out continuously.

[0011] Preferably, the connecting assembly includes a movable ring mounted on the inner wall of the central cylinder via a linear bearing. A plurality of hinge seats are fixedly installed at equal intervals along the circumference of the movable ring. A connecting rod is hinged to the hinge seat, and the connecting rod is fixedly connected to the spray pipe at the corresponding position.

[0012] Preferably, when the spray pipe is in a horizontal arrangement, the connection point between the connecting rod and the spray pipe is located at one end of the spray pipe near the axis of the central cylinder.

[0013] Preferably, the hinge seat limits the connecting rod through its own structure, so that the connecting rod's rotation angle range is °.

[0014] Preferably, the connecting assembly further includes a liquid distribution pipe that is sealed and movably inserted at the position of the central cylinder axis, and the lower end outlet of the liquid distribution pipe is connected to the corresponding spray pipe through a flexible hose.

[0015] Preferably, an L-shaped block corresponding to the hinge seat is fixedly installed on the lower outer side of the liquid separator. The L-shaped block is used to abut against the corresponding connecting rod and limit its vertical arrangement.

[0016] Preferably, a geared motor for driving the distribution pipe to rotate and a hydraulic cylinder for driving the distribution pipe to move up and down are fixedly installed inside the central cylinder.

[0017] Preferably, the upper part of the central cylinder is sealed and connected to the inside of the dispensing pipe. The medicine in the upper part of the central cylinder flows into the corresponding spray pipe through the dispensing pipe and the hose, and is atomized and sprayed out through the spray pipe.

[0018] Preferably, the driving assembly includes a sliding cylinder rotatably connected and sealed to the lower side of the sealing hopper, the sliding cylinder being vertically slidably connected to the support cylinder, a second hydraulic cylinder for driving the sliding cylinder being fixedly installed inside the support cylinder, and the lower end of the sliding cylinder being connected to a hydraulic pump through a second hose.

[0019] Preferably, the upper side of the sealing hopper is provided with a U-shaped groove that corresponds one-to-one with the spray pipe. When spraying the agent, the U-shaped groove is limited to the outside of the spray pipe.

[0020] The beneficial effects of this invention are as follows: First, during denitrification operations, the spray pipe is horizontally arranged on the lower outer side of the central cylinder to continuously spray the agent. During self-cleaning, the spray pipe is vertically retracted into the central cylinder, and the cleaning liquid is introduced into the central cylinder through a sealed hopper. Then, the spray pipe is continuously rotated in both directions to immerse it in the cleaning liquid and agitate it, simulating the washing principle of a washing machine to achieve automatic and efficient cleaning. This design allows the spray pipe to complete online self-cleaning without disassembling the equipment or requiring manual entry into the tower. This effectively solves the problem of rapid clogging of the spray pipe nozzles caused by high-viscosity flue gas, significantly reduces the maintenance frequency of the spray pipe, effectively eliminates the main factor causing frequent equipment shutdowns, thereby significantly shortening the downtime for cleaning and improving the continuous operation rate of the equipment.

[0021] Second, in the denitrification operation, the present invention uses a geared motor to drive each spray pipe to rotate through the liquid distribution pipe, so that the atomized agent is sprayed evenly in the circumference of the denitrification tower. At the same time, the rotating spray pipe continuously stirs the flue gas and the atomized agent, promoting full contact and mixing between the two, which effectively improves the denitrification reaction efficiency and agent utilization rate, and enhances the flue gas treatment effect.

[0022] Third, this invention employs a method where, during denitrification operations, the U-shaped groove of the sealing hopper is moved and snapped onto the outside of the spray pipe, thereby shielding and protecting the lower end of the central cylinder and effectively preventing a large amount of highly viscous dust from entering the interior of the central cylinder. During self-cleaning, the sealing hopper is sealed against the lower end of the central cylinder, and cleaning fluid is introduced into the central cylinder through hose two to soak and clean the spray pipe. After cleaning, the old cleaning fluid is discharged through hose two, achieving closed-loop inflow and outflow and centralized management of the cleaning fluid, simplifying the cleaning operation process, and further reducing maintenance workload. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a partial cross-sectional view of the denitrification tower, central cylinder, drive assembly, and support cylinder in this invention; Figure 3 This is a partial cross-sectional view of the central cylinder, spray pipe, sealing hopper, and hose II in this invention; Figure 4 This is a partial sectional view of the geared motor, hydraulic cylinder 1, connecting assembly and spray pipe in this invention; Figure 5 This is a partial cross-sectional view of the liquid distribution pipe, the movable ring, the spray pipe, and the hydraulic cylinder in this invention; Figure 6 This is a partial cross-sectional view of the movable ring, L-shaped block, hinge seat and hose in this invention.

[0025] In the diagram: 1. Dust collector; 2. Denitrification tower; 3. Spraying mechanism; 31. Central cylinder; 32. Connecting assembly; 33. Spraying pipe; 34. Support cylinder; 35. Drive assembly; 36. Sealing hopper; 37. Gear motor; 38. Hydraulic cylinder one; 321. Moving ring; 322. Hinge seat; 323. Connecting rod; 324. Liquid distribution pipe; 325. Hose one; 326. L-shaped block; 351. Sliding insert; 352. Hydraulic cylinder two; 353. Hose two. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0027] See Figure 1 and Figure 2 An integrated denitrification and dust removal device for waste incineration flue gas includes a dust collector 1 and a denitrification tower 2 connected in series. The denitrification tower 2 is equipped with two spraying mechanisms 3 arranged vertically, which perform self-cleaning at regular intervals.

[0028] When denitrifying and dust removal is performed on the flue gas generated during waste incineration, the flue gas flows into the dust collector 1 driven by the fan. The dust collector 1 filters and removes solid impurities from the flue gas. The filtered flue gas then flows into the denitrification tower 2 through the dust collector 1. The flue gas flows from bottom to top in the denitrification tower 2 and passes through two spraying mechanisms 3 in sequence. The spraying mechanisms 3 spray the agent in the denitrification tower 2, so that the agent combines with the flue gas in a countercurrent flow, and reacts the nitrogen oxides in the flue gas into harmless nitrogen and water.

[0029] In this embodiment, two gas distribution structures are provided inside the denitrification tower 2. Each gas distribution structure is located at the lower part of the corresponding spraying mechanism 3. The gas distribution structure adopts a traditional structure setting, which will not be described in detail here. During the denitrification process, the flue gas first passes through the gas distribution structure, so that the flue gas is evenly distributed in the denitrification tower 2, thereby improving the mixing efficiency of flue gas and reagent.

[0030] When treating flue gas, the spraying mechanism 3 evenly sprays the agent inside the denitrification tower 2. After treating the flue gas for a period of time, the specific continuous operating time of this equipment is flexibly adjusted according to the on-site flue gas concentration. When the agent spraying pressure of the spraying mechanism 3 is increased by 20%, the spraying mechanism 3 performs self-cleaning, thereby significantly reducing the frequency of maintenance of the denitrification tower 2. Since the spraying mechanism 3 is self-cleaning, each time the machine is shut down for cleaning, only the gas distribution structure and the inner wall of the denitrification tower 2 need to be cleaned, thereby significantly shortening the downtime for cleaning and improving the continuous operation rate of the equipment.

[0031] See Figure 2 , Figure 3 , Figure 4 and Figure 5 The spraying mechanism 3 includes a central cylinder 31 fixedly connected to the axis of the denitrification tower 2. Several spray pipes 33 are arranged inside the central cylinder 31 through a connecting assembly 32. During the denitrification operation, the spray pipes 33 are horizontally arranged on the lower outer side of the central cylinder 31 and continuously spray the agent. At the same time, each spray pipe 33 continuously rotates, so that the atomized agent is evenly sprayed in the circumference of the denitrification tower 2. Meanwhile, the rotating spray pipes 33 continuously stir the flue gas and the atomized agent, promote the full contact and mixing of the two, effectively improve the denitrification reaction efficiency and agent utilization rate, and enhance the flue gas treatment effect.

[0032] Continue reading Figure 2 , Figure 3 , Figure 4 and Figure 5 The spraying mechanism 3 also includes a support cylinder 34 fixedly connected to the axis of the denitrification tower 2 and located at the lower part of the central cylinder 31. A sealing hopper 36 is connected to the support cylinder 34 through a drive assembly 35. During self-cleaning, the spraying pipe 33 is first vertically retracted into the central cylinder 31, and then sealed against the lower end of the central cylinder 31 through the sealing hopper 36 to seal the interior of the central cylinder 31 and introduce the cleaning liquid into the central cylinder 31 through the sealing hopper 36.

[0033] The spray pipe 33 in the central cylinder 31 is completely immersed in the cleaning liquid. Then, the spray pipe 33 is continuously rotated in both directions to simulate the washing principle of a washing machine and achieve automatic and efficient cleaning of the spray pipe 33. This allows the spray pipe 33 to complete online self-cleaning without disassembling the equipment or requiring manual entry into the tower. This effectively solves the problem of rapid clogging of the spray pipe 33 nozzles caused by high-viscosity flue gas. After cleaning, the dirty cleaning liquid is discharged through the sealed hopper 36.

[0034] To facilitate the vertical movement of the spray pipe 33 within the central cylinder 31, the present invention incorporates the following structure: (See attached diagram) Figure 4 , Figure 5 and Figure 6 The connecting component 32 includes a liquid distribution pipe 324 that is sealed and movably inserted at the axial position of the central cylinder 31. The lower outlet of the liquid distribution pipe 324 is connected to the corresponding spray pipe 33 through a hose 325. A hydraulic cylinder 38 that drives the liquid distribution pipe 324 to move up and down is fixedly installed inside the central cylinder 31.

[0035] Specifically, a connecting plate is fixedly installed at the lower part of the telescopic section of hydraulic cylinder 38. The connecting plate is rotatably connected to the liquid distribution pipe 324. The hose 325 in this invention is a flexible pipe with an appropriate wall thickness. Its outer layer is covered with a flexible, corrosion-resistant, and high-temperature resistant material, so that it can generate axial thrust through the stacking of pipe walls when axially compressed. The movement of the telescopic section of hydraulic cylinder 38 drives the liquid distribution pipe 324 to move synchronously through the connecting plate, so that the liquid distribution pipe 324 pushes down or pulls up the spray pipe 33 through the hose 325.

[0036] It should be noted that when the distributor tube 324 moves downward, the spray tube 33 moves downward mainly under its own gravity. After the downward movement of the spray tube 33 is limited, the hose 325 continues to be axially compressed, and the tube walls stack. The stacked hose 325 forms a certain rigidity in the axial direction, which can apply a downward thrust to the upper end of the spray tube 33, causing the spray tube 33 to gradually swing outward from the vertical state to the horizontal state. When the distributor tube 324 moves upward, the distributor tube 324 pulls the spray tube 33 upward through the hose 325, avoiding the situation where the hose 325 is folded by force and cannot drive the spray tube 33.

[0037] In this invention, two partitions are fixedly installed in the middle of the central cylinder 31, thereby dividing the central cylinder 31 into three regions: lower, middle, and upper. A fan-shaped partition is installed in the upper region of the central cylinder 31, which further divides the upper region into two regions: inner and outer. The outer region is connected to the drug supply equipment. The hydraulic cylinder 38 in this invention is bolted to the lower partition, and its cylinder body is located in both the middle and inner regions.

[0038] It is worth noting that when cleaning the spray pipe 33, the spray pipe 33 is completely located inside the central cylinder 31, and there is still a certain distance between the upper end of the spray pipe 33 and the lower partition. The cleaning fluid is injected into the central cylinder 31 in a metered manner, so that the cleaning fluid only needs to completely submerge the spray pipe 33. On the one hand, the cleaning fluid can be fully agitated when the spray pipe 33 is rotated, thereby increasing the cleaning effect; on the other hand, it can prevent the cleaning fluid from contacting the cylinder body of the hydraulic cylinder 38.

[0039] To facilitate the automatic rotation of the spray pipe 33 from vertical to horizontal after it has fully extended from the lower part of the central cylinder 31, the present invention designs the following structure: (Continue reading...) Figure 4 , Figure 5 and Figure 6 The connecting assembly 32 also includes a movable ring 321 mounted on the inner wall of the central cylinder 31 via a linear bearing. Several hinge seats 322 are fixedly installed at equal intervals along the circumference of the inner side of the movable ring 321. A connecting rod 323 is hinged to the hinge seat 322, and the connecting rod 323 is fixedly connected to the spray pipe 33 at the corresponding position.

[0040] When the spray pipe 33 is in a horizontal arrangement, the connection point between the connecting rod 323 and the spray pipe 33 is located at one end of the spray pipe 33 near the axis of the central cylinder 31. The hinge seat 322 limits the connecting rod 323 through its own structure, so that the rotation angle range of the connecting rod 323 is 90°.

[0041] When the spray pipe 33 moves downward, the spray pipe 33 drives the hinge seat 322 to move downward synchronously through the connecting rod 323. The hinge seat 322 drives the movable ring 321 to move downward. In this embodiment, a groove is provided on the inner wall of the lower region of the central cylinder 31 for the movable ring 321 to move and limit its displacement. When the spray pipe 33 is fully extended from the lower part of the central cylinder 31, the lower side of the movable ring 321 abuts against the lower limit of the groove, so that the hinge seat 322 cannot continue to move downward at this time.

[0042] Then, the distributor pipe 324 continues to move downward, so that the distributor pipe 324 pushes the spray pipe 33 through the hose 325, so that the spray pipe 33 deflects away from the central cylinder 31 with the hinge of the connecting rod 323 as the axis, until the connecting rod 323 rotates from horizontal to vertical, so that the spray pipe 33 rotates to a horizontal position, which facilitates the spraying of the agent into the denitrification tower 2 by the spray pipe 33.

[0043] To ensure that the spray pipe 33, after fully extending from the central cylinder 31, maintains a stable horizontal posture, the present invention designs the following structure: (See attached diagram) Figure 6 An L-shaped block 326 corresponding to the hinge seat 322 is fixedly installed on the lower outer side of the liquid separator 324. The L-shaped block 326 is used to abut against the corresponding connecting rod 323 and limit its vertical arrangement.

[0044] When the distributor pipe 324 moves downward, the distributor pipe 324 drives the L-shaped block 326 on it to move downward synchronously. After the hinge seat 322 is limited, the L-shaped block 326 gradually moves downward and approaches the hinge seat 322 until the L-shaped block 326 passes through the hinge seat 322 and abuts against the corresponding connecting rod 323, and pushes the connecting rod 323 to deflect. Through the pushing force of the L-shaped block 326, the connecting rod 323 is forced to deflect to the maximum angle, so that the spray pipe 33 is arranged horizontally. Then the L-shaped block 326 presses against the connecting rod 323, thereby stabilizing and maintaining the horizontal posture of the spray pipe 33.

[0045] To facilitate continuous rotation of the spray pipe 33 during pesticide application and alternating forward and reverse rotation of the spray pipe 33 during cleaning, the present invention designs the following structure: (See attached diagram) Figure 4 and Figure 5 Inside the central cylinder 31, a reduction motor 37 is fixedly installed to drive the liquid distribution pipe 324 to rotate. In this embodiment, a drive pulley is fixedly installed on the output shaft of the reduction motor 37, and a driven pulley is rotatably connected to the lower side of the lower partition of the central cylinder 31. A belt is wound between the drive pulley and the driven pulley, and the driven pulley is sleeved on the outside of the liquid distribution pipe 324. The driven pulley and the liquid distribution pipe 324 are slidably connected vertically.

[0046] When the spray pipe 33 needs to be rotated, the reduction motor 37 is started, which drives the distribution pipe 324 to rotate in sequence through the driving pulley, belt and driven pulley. The distribution pipe 324 drives the movable ring 321 to rotate together through the L-shaped block 326 and the hose 325, thereby making the spray pipe 33 rotate.

[0047] To facilitate the introduction of the agent into the rotating spray pipe 33, the present invention is designed with the following structure: (See reference) Figure 4 , Figure 5 and Figure 6 The upper part of the dispensing pipe 324 has a single-tube structure, and the lower part has a multi-tube structure with the same inner diameter, so that the agent in the single-tube structure is evenly distributed into the multi-tube structure. The outer side of the single-tube structure of the dispensing pipe 324 is sealed and movablely connected to the upper partition of the central cylinder 31, so that the upper outer area of ​​the central cylinder 31 is sealed and connected to the inside of the dispensing pipe 324. When spraying the agent, the agent supply equipment introduces the agent into the upper outer area of ​​the central cylinder 31, so that the agent flows into the corresponding spray pipe 33 through the dispensing pipe 324 and the hose 325, and is atomized and sprayed out through the spray pipe 33.

[0048] To facilitate the sealing of the lower end of the central cylinder 31 during cleaning of the spray pipe 33, the present invention designs the following structure: (See attached diagram) Figure 2 and Figure 3 The drive assembly 35 includes a sliding cylinder 351 that is rotatably connected and sealed to the lower side of the sealing hopper 36. The sliding cylinder 351 is vertically slidably connected to the support cylinder 34. A second hydraulic cylinder 352 for driving the sliding cylinder 351 is fixedly installed inside the support cylinder 34. The lower end of the sliding cylinder 351 is connected to the hydraulic pump through a second hose 353.

[0049] In this embodiment, the liquid pump is a commercially available liquid supply device. When the liquid is being drawn in, the liquid pump can pump the clean cleaning liquid in the material tank into the second hose 353. When the liquid is being discharged, the dirty cleaning liquid in the second hose 353 can be pumped into the recycling tank.

[0050] When the spray pipe 33 needs to be cleaned, the telescopic section of the second hydraulic cylinder 352 is first retracted, so that the second hydraulic cylinder 352 drives the sealing bucket 36 to move down away from the central cylinder 31 through the sliding tube 351, thereby leaving space for the spray pipe 33 to rotate from horizontal to vertical. When the spray pipe 33 is completely retracted inside the central cylinder 31, the telescopic section of the second hydraulic cylinder 352 is extended, so that the sealing bucket 36 presses against the lower end of the central cylinder 31, thereby sealing the central cylinder 31.

[0051] Then, the liquid pump pumps the clean cleaning solution into the second hose 353, so that the clean cleaning solution is injected into the central cylinder 31 through the sliding tube 351 and the sealing hopper 36, thereby achieving contact cleaning between the spray pipe 33 and the clean cleaning solution; after cleaning, the liquid pump extracts the cleaning solution from the second hose 353, so that the dirty cleaning solution in the central cylinder 31 flows back to the second hose 353 under the action of gravity through the sealing hopper 36, thereby completely recovering the dirty cleaning solution.

[0052] To shield the lower end of the central cylinder 31 during pesticide spraying and effectively prevent a large amount of highly viscous fumes from entering the interior of the central cylinder 31, the present invention designs the following structure: (See attached diagram) Figure 2 and Figure 3 The upper side of the sealing hopper 36 is provided with a U-shaped groove that corresponds one-to-one with the spray pipe 33. When spraying the agent, the sealing hopper 36 is moved upward, so that the U-shaped groove on the sealing hopper 36 is limited to the outside of the spray pipe 33, thereby making the sealing hopper 36 as close as possible to the central cylinder 31, and thus blocking the lower end of the central cylinder 31.

[0053] It should be noted that the sealing hopper 36 consists of a funnel structure at the bottom and an annular structure with a U-shaped groove at the top. When spraying the agent, the upper part of the annular structure of the sealing hopper 36 is located outside the lower end of the central cylinder 31. When cleaning the spray pipe 33, the annular structure of the sealing hopper 36 is completely located outside the lower end of the central cylinder 31, and the funnel structure of the sealing hopper 36 is sealed and pressed against the lower end of the central cylinder 31.

[0054] Although this invention adds structures such as a central cylinder 31, a spray pipe 33, a support cylinder 34, and a sealing hopper 36 to the traditional denitrification and dust removal equipment, it is precisely through the cooperation of these structures that this invention achieves the timed online self-cleaning function of the spray pipe 33. This effectively solves the technical problem of frequent clogging of the spray pipe 33 caused by high-viscosity flue gas, and transforms the cleaning work of the spray pipe 33, which has the highest maintenance frequency, from manual operation into tower entry to automatic completion by the equipment. This significantly reduces the frequency of operation and maintenance and the downtime per operation, and significantly improves the continuous operation rate and overall processing efficiency of the equipment. Therefore, it has high practical value.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] 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. An integrated denitrification and dust removal device for waste incineration flue gas, comprising a dust collector and a denitrification tower connected in series, characterized in that, The denitrification tower is equipped with two spraying mechanisms arranged vertically. The spraying mechanism includes a central cylinder fixedly connected to the axis of the denitrification tower, and several spray pipes are installed inside the central cylinder through a connecting assembly. During denitrification operation, the spray pipes are horizontally arranged on the lower outer side of the central cylinder and continuously spray the agent. During self-cleaning, the spray pipes are vertically retracted into the central cylinder. The spraying mechanism also includes a support cylinder fixedly connected to the axis of the denitrification tower and located at the bottom of the central cylinder. A sealing hopper is connected to the support cylinder through a drive assembly. During self-cleaning, the sealing hopper seals against the bottom of the central cylinder and introduces the cleaning liquid into the central cylinder. Then, the spraying pipe is continuously rotated in both directions, so that the spraying pipe is immersed in the cleaning liquid and continuously agitated.

2. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 1, characterized in that, The connecting assembly includes a movable ring mounted on the inner wall of the central cylinder via a linear bearing. Several hinge seats are fixedly installed at equal intervals along the circumference of the movable ring. A connecting rod is hinged to the hinge seat, and the connecting rod is fixedly connected to the spray pipe at the corresponding position.

3. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 2, characterized in that, When the spray pipe is in a horizontal arrangement, the connection point between the connecting rod and the spray pipe is located at one end of the spray pipe near the axis of the central cylinder.

4. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 2, characterized in that, The hinge seat limits the connecting rod through its own structure, so that the connecting rod can rotate within a range of 90°.

5. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 2, characterized in that, The connecting assembly also includes a liquid distribution pipe that is sealed and movably inserted at the axis of the central cylinder, and the lower outlet of the liquid distribution pipe is connected to the corresponding spray pipe through a flexible hose.

6. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 5, characterized in that, An L-shaped block corresponding to the hinge seat is fixedly installed on the lower outer side of the liquid separator. The L-shaped block is used to abut against the corresponding connecting rod and limit its vertical arrangement.

7. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 5, characterized in that, The central cylinder is fixedly installed with a geared motor that drives the distribution pipe to rotate and a hydraulic cylinder that drives the distribution pipe to move up and down.

8. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 5, characterized in that, The upper part of the central cylinder is sealed and connected to the inside of the dispensing pipe. The medicine in the upper part of the central cylinder flows into the corresponding spray pipe through the dispensing pipe and the hose, and is atomized and sprayed out through the spray pipe.

9. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 1, characterized in that, The drive assembly includes a sliding cylinder that is rotatably connected and sealed to the lower side of the sealing hopper. The sliding cylinder is vertically slidably connected to the support cylinder. A second hydraulic cylinder for driving the sliding cylinder is fixedly installed inside the support cylinder. The lower end of the sliding cylinder is connected to a hydraulic pump through a second hose.

10. The integrated denitrification and dust removal equipment for waste incineration flue gas according to claim 5, characterized in that, The upper side of the sealing hopper is provided with a U-shaped groove that corresponds to the spray pipe. When spraying the agent, the U-shaped groove is limited to the outside of the spray pipe.

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