SNCR (selective non-catalytic reduction) flue gas denitration system for garbage incineration power generation

Abstract

The invention relates to the technical field of flue gas denitration systems, in particular to a garbage incineration power generation SNCR flue gas denitration system which comprises a furnace wall and a shielding seat, a water cooling wall and a spray gun are arranged on the furnace wall, the spray gun penetrates through a passing groove of the water cooling wall to extend into a furnace cavity of the furnace wall, a surrounding part is arranged on the shielding seat, and the shielding seat is provided with a baffle plate. The spray gun is sleeved with the shielding base so that the shielding base can be located in the furnace cavity to shield the passing groove, and the surrounding part abuts against the inner side of the passing groove. According to the SNCR flue gas denitration system for garbage incineration power generation provided by the invention, the shielding seat is positioned in the furnace chamber to shield the passing groove of the water-cooled wall, so that the problem that urea liquid drops sprayed by the spray gun float into the space between the water-cooled wall and the furnace wall along the passing groove, and the furnace wall is eroded and damaged by the urea liquid drops is avoided; and secondly, the enclosure part further abuts against the inner side of the passing groove so as to further prevent urea liquid drops from invading the furnace wall along a gap between the shielding base and the water cooling wall, and the protection performance of the furnace wall is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitrification systems, and more particularly to an SNCR flue gas denitrification system for waste incineration power generation. Background Art

[0002] Currently, a low-cost SNCR flue gas denitrification system is often used to perform denitrification operations on the flue gas generated by waste incineration power generation.

[0003] According to the patent with publication number CN102274687B, publication (announcement) date: May 22, 2013, an SNCR flue gas denitrification device using urea as a reducing agent is disclosed. It includes a solid urea tank truck, a hose, a union, a solid urea regulating valve, a solid urea storage tank, a solid urea feeder, a compressed air main pipe, a compressed air regulating valve, a stirrer, a urea solution preparation tank, a heater, an industrial water main pipe, an industrial water regulating valve, a urea transfer pump, a urea solution storage tank, a urea injection pump, a mixer, a urea reflux regulating valve, a pressurized industrial water regulating valve, an industrial water pump, a dilute urea solution regulating valve, an atomizing steam regulating valve, an atomizing steam main pipe, and a urea injection unit.

[0004] In the prior art including the above-mentioned patent, a urea spray gun is used to extend into the furnace cavity through the through groove of the water wall tube bundle, and the spray gun sprays urea solution to react with NO in the flue gas to achieve denitrification operations. When the spray gun atomizes and sprays the urea solution into the furnace cavity, due to the flow of the flue gas, it is easy for the urea droplets to float into the space between the water wall tube bundle and the furnace wall along the through groove, and as a result, the furnace wall behind the water wall tube bundle is eroded and damaged due to the long-term accumulation of urea droplets. x When the spray gun atomizes and sprays the urea solution into the furnace cavity, due to the flow of the flue gas, it is easy for the urea droplets to float into the space between the water wall tube bundle and the furnace wall along the through groove, and as a result, the furnace wall behind the water wall tube bundle is eroded and damaged due to the long-term accumulation of urea droplets. Summary of the Invention

[0005] The purpose of the present invention is to provide an SNCR flue gas denitrification system for waste incineration power generation to solve the above problems.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An SNCR flue gas denitrification system for waste incineration power generation includes a furnace wall and a shielding seat. The furnace wall is provided with a water wall and a spray gun. The spray gun passes through the through groove of the water wall and extends into the furnace cavity of the furnace wall. The shielding seat is provided with a surrounding portion. The shielding seat is sleeved on the spray gun and located in the furnace cavity to shield the through groove, and the surrounding portion abuts against the inner side of the through groove.

[0007] Preferably, the furnace wall is provided with an elastic bladder and a bearing seat that abuts against the elastic bladder. The bearing seat is provided with a supporting portion. The shielding seat is axially slidably sleeved on the spray gun, and the shielding seat is provided with a movable shaft. The movable shaft is fixedly connected to the elastic bladder so that the elastic bladder drives the supporting portion of the bearing seat and the shielding seat to clamp on both sides of the water wall.

[0008] Preferably, a moving seat is symmetrically arranged on the shielding seat, a scratching tip is arranged on the moving seat, and the shielding seat is driven to slide along the axial direction of the spray gun so that the scratching tip moves first to scratch the side surface of the spray gun.

[0009] Preferably, the movable seat is relatively slidably arranged on the shielding seat, and the shielding seat is driven to slide to be flush with the nozzle of the spray gun so that the movable seat slides away relatively, and the scratching tip moves to scratch the nozzle of the spray gun.

[0010] Preferably, a truncated cone-shaped mask portion is provided on the movable seat, a bucket-shaped mask hole is opened on the mask portion, and the movable seat slides away from each other to make the mask portion coaxial with the spray gun, and the narrow end of the mask hole is aligned with the nozzle end of the spray gun.

[0011] Preferably, the mask portion is provided with an air inlet and an air outlet connected with the mask hole along the tangent direction of the inner wall of the mask hole, the first end of the air inlet is toward the direction of the smoke from the furnace chamber, and the first end of the air outlet is toward the nozzle of the spray gun.

[0012] Preferably, a push portion is provided on the movable shaft, the movable shaft is axially slidably provided on the shielding seat, a guide slope and a resistance portion are provided on the movable seat, the movable shaft is driven to slide axially to push the guide slope to drive the movable seat to slide relatively away, and the resistance portion moves to resist the side of the spray gun.

[0013] Preferably, it also includes a sliding rod axially slidably arranged on the movable shaft, the sliding rod is in a default state so that the secondary push block arranged thereon is flush with the pushing portion, the secondary push block is symmetrically provided with an engaging portion, the movable seat is provided with an engaging groove, the pushing portion pushes the movable seat to slide relatively away to a maximum stroke so that the engaging portion is engaged in the engaging groove.

[0014] Preferably, a deformation portion is provided on the elastic bag, the seat is slidably arranged so that the extrusion portion provided thereon abuts against the elastic bag, and the first end of the movable shaft passes through a through hole provided on the seat to be fixedly connected to the deformation portion.

[0015] Preferably, the movable seat is provided with a sliding portion, the sliding portion is slidably arranged in a second sliding groove provided on the shielding seat, and the sliding portion is provided with an elastic member for driving the movable seat to slide relatively, close together and reset.

[0016] In the above technical solution, an SNCR flue gas denitrification system for incinerating waste to generate electricity provided by the present invention has the following beneficial effects: The shielding seat is located in the furnace chamber to shield the through groove of the water wall, thereby avoiding the problem that the urea droplets sprayed by the spray gun float into the space between the water wall and the furnace wall along the through groove, resulting in erosion and damage of the furnace wall by the urea droplets. Secondly, the enclosure portion also abuts against the inner side of the through groove to further prevent the urea droplets from invading the furnace wall along the gap between the shielding seat and the water wall, further improving the protection of the furnace wall. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic vertical cross-sectional view of the overall structure at the movable shaft provided by the embodiment of the present invention; Figure 2 It is a schematic vertical cross-sectional view of the overall structure at the spray gun provided by the embodiment of the present invention; Figure 3 It is a schematic horizontal cross-sectional view of the overall structure provided by the embodiment of the present invention; Figure 4 It is a partial structure schematic diagram of the furnace wall and the water wall provided by the embodiment of the present invention; Figure 5 It is a structure schematic diagram of the bearing seat, the shielding cover, the movable shaft and the movable seat provided by the embodiment of the present invention; Figure 6 It is an exploded structure schematic diagram of the bearing seat, the shielding cover, the elastic bladder and the movable seat provided by the embodiment of the present invention; Figure 7 It is an exploded structure schematic diagram of the movable shaft, the sliding rod, the shielding seat and the movable seat provided by the embodiment of the present invention; Figure 8 It is an exploded structure schematic diagram of the movable seat and the elastic member provided by the embodiment of the present invention.

[0019] Description of the Reference Numerals: 1. Furnace wall; 11. Furnace cavity; 2. Water-cooled wall; 21. Pass-through groove; 3. Shielding seat; 31. Enclosure part; 32. First sliding groove; 33. Second sliding groove; 4. Bearing seat; 41. Supporting part; 42. Extrusion part; 43. Sliding shaft part; 44. Pass-through hole; 45. Limiting groove; 5. Elastic bladder; 51. Deformation part; 6. Moving shaft; 61. Pushing part; 611. Pushing slope; 62. Accommodating groove; 7. Moving seat; 71. Scratching tip; 72. Masking part; 721. Masking hole; 722. Air inlet hole; 723. Air outlet hole; 73. Contact part; 74. Guiding slope; 75. Sliding part; 76. Fitting groove; 8. Slide bar; 81. Secondary pushing block; 82. Fitting part; 91. Spray gun; 92. Elastic member. Detailed implementation manners

[0020] In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present disclosure.

[0021] As Figure 1-8 shown, an SNCR flue gas denitration system for incinerating garbage to generate electricity includes a furnace wall 1 and a shielding seat 3. A water-cooled wall 2 and a spray gun 91 are arranged on the furnace wall 1. The spray gun 91 passes through the pass-through groove 21 of the water-cooled wall 2 and extends into the furnace cavity 11 of the furnace wall 1. An enclosure part 31 is arranged on the shielding seat 3. The shielding seat 3 is sleeved on the spray gun 91 and located in the furnace cavity 11 to shield the pass-through groove 21, and the enclosure part 31 abuts against the inner side of the pass-through groove 21.

[0022] Specifically, as Figure 1 shown, a water-cooled wall 2 is arranged on the furnace wall 1 so that the water-cooled wall 2 is located in the furnace cavity 11, and the nozzle of the spray gun 91 vertically extends into the furnace cavity 11 from the pass-through groove 21 of the furnace wall 1 and the water-cooled wall 2. During the denitration operation, the flue gas flows vertically upward from the lower part of the furnace cavity 11, and the nozzle of the spray gun 91 vertically sprays urea solution into the furnace cavity 11. The urea solution reacts with the NO x gas in the flue gas, and reduces the NO x in the flue gas to harmless N 2 and H 2 O to achieve the reduction of NO xThe purpose is as follows. The shielding seat 3 is arranged on the spray gun 91 to shield the through slot 21, thereby avoiding the problem that the urea droplets sprayed by the spray gun 91 float into the space between the water-cooled wall 2 and the furnace wall 1 along the through slot 21, which may cause erosion and damage to the furnace wall 1 by the urea droplets. Secondly, the surrounding part 31 also abuts against the inner side of the through slot 21 to further prevent the urea droplets from invading the furnace wall 1 along the gap between the shielding seat 3 and the water-cooled wall 2, further improving the protection of the furnace wall 1.

[0023] Secondly, the SNCR flue gas denitration system further includes a stirrer, a urea solution preparation tank, a heater, an industrial water main pipe, an industrial water regulating valve, a urea transfer pump, a urea solution storage tank, a urea injection pump, and an industrial water pump for the mixer, to be used for preparing urea solution and atomizing and spraying the urea solution into the furnace chamber 11 along the spray gun 91. Among them, the stirrer, the urea solution preparation tank, the heater, the industrial water main pipe, the industrial water regulating valve, the urea transfer pump, the urea solution storage tank, the urea injection pump, the industrial water pump for the mixer and the connections therebetween are common technical knowledge for those skilled in the art and will not be elaborated herein.

[0024] In the above technical solution, the shielding seat 3 is located in the furnace chamber 11 to shield the through slot 21 of the water-cooled wall 2, thereby avoiding the problem that the urea droplets sprayed by the spray gun 91 float into the space between the water-cooled wall 2 and the furnace wall 1 along the through slot 21, which may cause erosion and damage to the furnace wall 1 by the urea droplets. Secondly, the surrounding part 31 also abuts against the inner side of the through slot 21 to further prevent the urea droplets from invading the furnace wall 1 along the gap between the shielding seat 3 and the water-cooled wall 2, further improving the protection of the furnace wall 1.

[0025] As another embodiment provided by the present invention, an elastic bladder 5 is arranged on the furnace wall 1 and a bearing seat 4 abuts against the elastic bladder 5. A supporting part 41 is arranged on the bearing seat 4. The shielding seat 3 is axially slidably sleeved on the spray gun 91, and a movable shaft 6 is arranged on the shielding seat 3. The movable shaft 6 is fixedly connected with the elastic bladder 5 so that the elastic bladder 5 drives the supporting part 41 of the bearing seat 4 and the shielding seat 3 to clamp both sides of the water-cooled wall 2.

[0026] Specifically, as Figure 2As shown, the elastic bladder 5 and the seat 4 are arranged on the furnace wall 1, while the shielding seat 3 is slidably sleeved on the spray gun 91 so that the seat 4 and the shielding seat 3 are respectively located on both sides of the water-cooled wall 2, and the movable shaft 6 on the shielding seat 3 is fixedly connected to the elastic bladder 5 to pull the shielding seat 3 tightly close to the seat 4, so that the seat 4 and the shielding seat 3 clamp and fix the water-cooled wall 2. Since the water-cooled wall 2 is composed of a plurality of tube bundles, and there is fluid for heat exchange in each tube bundle, the seat 4 and the shielding seat 3 are used to clamp and fix the water-cooled wall 2 to reduce the vibration of the water-cooled wall 2 during operation and reduce the damage to the furnace wall 1 caused by the vibration of the water-cooled wall 2. Secondly, the supporting part 41 is used to fit on different tube bundles of the water-cooled wall 2 at the same time, so as to further improve the fixing stability of the water-cooled wall 2 and improve the protection of the water-cooled wall 2 and the furnace wall 1.

[0027] Secondly, as Figure 5 shown, a limiting groove 45 is further arranged on the seat 4, and the enclosing part 31 abuts against and is fitted in the through groove 21 and the limiting groove 45 to further improve the fixing stability of the seat 4 and the shielding seat 3 for the water-cooled wall 2.

[0028] Furthermore, a deformation part 51 is arranged on the elastic bladder 5, the seat 4 is slidably arranged so that the extrusion part 42 arranged thereon abuts against the elastic bladder 5, and the first end of the movable shaft 6 passes through the through hole 44 opened on the seat 4 to be fixedly connected to the deformation part 51.

[0029] As Figure 6As shown in the figure, a sliding shaft portion 43 is provided on the bearing seat 4. The bearing seat 4 is arranged on the furnace wall 1 to slide relative to the water-cooled wall 2 through the sliding shaft portion 43. The elastic capsule 5 is urged by its own elasticity to push the bearing seat 4 to slide and abut against the water-cooled wall 2. Moreover, the elastic capsule 5 also abuts against the water-cooled wall 2 by means of the movable shaft 6 to tension and block the seat 3. When the temperature in the furnace cavity 11 changes greatly, resulting in a large change in the fluid flow rate in the water-cooled wall 2, the water-cooled wall 2 will generate a large radial vibration due to the change in the internal flow velocity. Therefore, the water-cooled wall 2 will push the bearing seat 4 to slide, causing the extrusion portion 42 to squeeze the elastic capsule 5. The two sides of the elastic capsule 5 are deformed under pressure, causing the deformation portion 51 in the middle to protrude outward. The deformation portion 51 pushes the blocking seat 3 to slide away from the water-cooled wall 2 through the movable shaft 6, thereby temporarily releasing the fixation of the water-cooled wall 2. Subsequently, the elastic capsule 5 is reset by its own elasticity to make the bearing seat 4 and the blocking seat 3 slide relatively close again and clamp on the water-cooled wall 2. Thus, by using the bearing seat 4, the elastic capsule 5, the blocking seat 3 and the movable shaft 6, the fixation is released first and then clamped again when the internal flow rate of the water-cooled wall 2 changes greatly, thereby reducing the damage to the water-cooled wall 2 caused by the water hammer effect due to the change in the flow rate in the water-cooled wall 2 and improving the protection of the water-cooled wall 2. Secondly, the bearing seat 4 and the movable shaft 6 can move and will not vibrate synchronously with the vibration of the water-cooled wall 2, so that the bearing seat 4 and the blocking seat 3 will not resonate due to the vibration of the water-cooled wall 2. At the same time, the bearing seat 4 and the blocking seat 3 also realize the delayed clamping and fixation of the vibration of the water-cooled wall 2, thereby further avoiding the damage to the water-cooled wall 2 caused by the resonance between the various tube bundles in the water-cooled wall 2 and providing protection for the water-cooled wall 2.

[0030] As another embodiment provided by the present invention, moving seats 7 are symmetrically arranged on the blocking seat 3, and scraping tips 71 are arranged on the moving seats 7. The blocking seat 3 is driven to slide along the axial direction of the spray gun 91 so that the scraping tips 71 first move to scrape the side surface of the spray gun 91.

[0031] Specifically, as Figure 7 shown, scraping tips 71 facing the spray gun 91 are arranged on the moving seats 7, and the moving seats 7 are arranged on the blocking seat 3 so that the scraping tips 71 abut against the side surface of the spray gun 91. After the water-cooled wall 2 vibrates due to the change in the flow velocity, the water-cooled wall 2 pushes the bearing seat 4 and squeezes the elastic capsule 5 to deform. The elastic capsule 5 pushes the moving seat 7 to slide along the axial direction of the spray gun 91 through the movable shaft 6. At this time, the moving seat 7 moves synchronously with the moving seat 7 so that the scraping tips 71 can move and scrape the side surface of the spray gun 91. First, the scraping tips 71 scrape off the flue gas dust and urea crystals accumulated on the side surface of the spray gun 91, thereby slowing down the corrosion speed of the spray gun 91. Secondly, axial vibration is generated on the spray gun 91, so that the urea crystals and flue gas dust that are likely to be generated on the nozzle of the spray gun 91 are shaken off, avoiding the problem that the nozzle of the spray gun 91 is blocked due to the accumulation of urea crystals and flue gas dust, and improving the stability of the spray gun 91 to atomize and spray urea solution into the furnace cavity 11.

[0032] As another embodiment provided by the present invention, the movable seat 7 is relatively slidably arranged on the shielding seat 3, and the shielding seat 3 is driven to slide to be flush with the nozzle of the spray gun 91 so that the movable seat 7 slides away relatively, and the scratching tip 71 moves to scratch the nozzle of the spray gun 91.

[0033] Specifically, Figure 3 As shown, the movable seat 7 is arranged on the shielding seat 3 in a relatively sliding manner. When the shielding seat 3 is driven by the elastic bag 5 and the movable shaft 6 to slide to be flush with the nozzle of the spray gun 91, the two movable seats 7 are driven to slide relatively away so that the scratching tip 71 moves and scratches the nozzle of the spray gun 91 along the radial direction of the spray gun 91, so that the movable seat 7 is used to scrape and clean the urea crystals and flue gas dust accumulated at the nozzle of the spray gun 91, and further avoid the problem that the nozzle of the spray gun 91 is blocked by urea crystals and flue gas dust. Among them, an elastic plate can be set on the shielding seat 3 to pull the two movable seats 7 to slide away relative to each other, and then a detection sensor is used to cooperate with a pneumatic push rod to drive the two movable seats 7 to move away relative to each other, or other driving methods known to those skilled in the art that can drive the movable seat 7 to slide relative to each other can be replaced. Secondly, a limit ring can be set at the nozzle of the spray gun 91, so that after the shielding seat 3 slides to be flush with the nozzle of the spray gun 91, the shielding seat 3 stops sliding.

[0034] Furthermore, the movable seat 7 is provided with a sliding portion 75, which is slidably arranged in the second sliding groove 33 provided on the shielding seat 3, and the sliding portion 75 is provided with an elastic member 92 for driving the movable seat 7 to slide relatively close to reset. Figure 7 As shown, the sliding portion 75 of the movable seat 7 is simultaneously slidably arranged in the second sliding groove 33 of the shielding seat 3 to improve the relative sliding stability of the movable seat 7. Secondly, an elastic member 92 is arranged on the sliding portion 75 to pull the two movable seats 7 to slide relatively together for reset. Among them, the elastic member 92 can be replaced by elastic objects known to those skilled in the art, such as springs, airbags, elastic plates, etc.

[0035] As another embodiment provided by the present invention, a truncated cone-shaped mask portion 72 is provided on the movable seat 7, and a bucket-shaped mask hole 721 is opened on the mask portion 72. The movable seat 7 slides away relatively to make the mask portion 72 coaxial with the spray gun 91, and the narrow end of the mask hole 721 is aligned with the nozzle end of the spray gun 91.

[0036] Specifically, Figure 8As shown, the masking portion 72 is frustum-shaped so that the masking hole 721 is funnel-shaped. The masking hole 721 has two openings, a narrow hole and a wide hole. When the shielding seat 3 is driven by the elastic bladder 5 and the movable shaft 6 to slide to be flush with the nozzle of the spray gun 91, the two movable seats 7 are driven to slide relatively away from each other so that the scraping tip 71 moves and scrapes along the radial direction of the spray gun 91 at the nozzle of the spray gun 91. Subsequently, the narrow end of the masking hole 721 of the movable seat 7 is aligned with the end of the nozzle of the spray gun 91, so that the masking portion 72 of the movable seat 7 is located on the front side of the spray gun 91 to form an annular spray channel with an increasing radial value, thereby increasing the velocity of the urea solution sprayed from the spray gun 91 and avoiding the problem of urea crystallization caused by the backflow of high-speed flue gas at the nozzle of the spray gun 91. Secondly, the decomposition products (such as ammonium cyanate) of urea crystallization at high temperature will cause chemical corrosion to the metal spray gun 91. The masking portion 72 of the movable seat 7 is used to mask the front side of the spray gun 91 to reduce the stability at the nozzle of the spray gun 91, thereby reducing the generation of urea decomposition products, and further improving the protection of the spray gun 91.

[0037] As another embodiment provided by the present invention, an air inlet hole 722 and an air outlet hole 723 are respectively formed on the masking portion 72 and are connected to the masking hole 721 along the tangential direction of the inner wall of the masking hole 721. The first end of the air inlet hole 722 faces the direction of the flue gas in the furnace chamber 11, and the first end of the air outlet hole 723 faces the nozzle of the spray gun 91.

[0038] Specifically, Figure 6 As shown, the axial direction of the air inlet hole 722 is parallel to the flue gas flow in the furnace chamber 11. The lower vertical end of the air inlet hole 722 is the first end, so that the first end of the air inlet hole 722 faces the direction of the flue gas, and the axial direction of the air outlet hole 723 is perpendicular to the flue gas flow direction. The end of the air outlet hole 723 facing away from the masking hole 721 is the first end, and the first end of the air outlet hole 723 faces the side of the nozzle of the spray gun 91.

[0039] When the spray gun 91 atomizes and sprays urea solution into the furnace chamber 11, the flue gas flows upward vertically through the spray gun 91. Since the urea solution is relatively viscous, part of the atomized urea solution is likely to adhere to the side of the spray gun 91 facing away from the direction of the flue gas, that is, the urea solution is likely to adhere to the upper vertical side of the spray gun 91. When the bearing seat 4 and the shielding seat 3 are clamped on both sides of the water-cooled wall 2, as Figure 7 shown, the first end of the air outlet hole 723 faces the upper vertical side of the nozzle position of the spray gun 91. At this time, the spray gun 91 atomizes and sprays urea solution into the furnace chamber 11, and the flue gas flows into the masking hole 721 through the air inlet hole 722 and flows along the inner wall of the masking hole 721 and changes direction. Subsequently, part of the flue gas horizontally flows through the air outlet hole 723 and impacts on the upper vertical side of the nozzle position of the spray gun 91, thereby avoiding the corrosion of the spray gun 91 caused by the adhesion of the urea solution on the upper vertical side of the spray gun 91 (as Figure 6 shown), and further improving the protection of the spray gun 91.

[0040] When the shielding seat 3 is driven by the elastic bag 5 and the movable shaft 6 to slide to be flush with the nozzle of the spray gun 91, the two movable seats 7 are driven to slide away from each other so that the scratching tip 71 moves and scratches the nozzle of the spray gun 91 along the radial direction of the spray gun 91, and then the narrow end of the shield hole 721 of the movable seat 7 is aligned with the nozzle end of the spray gun 91. At this time, the shield part 72 is located on the front side of the spray gun 91 to form an annular spray channel with increasing diameter, and the flue gas will enter from the air inlet hole 722 along the tangential direction of the shield hole 721, and be located in the shield hole 721 to form an annular accelerated airflow, so that the flue gas can be located in the shield hole 721 to form an air film to wrap the liquid column, which not only prevents the droplets from prematurely agglomerating, but also refines the liquid particles through gas-liquid friction, thereby further improving the atomization degree of the urea solution sprayed into the furnace chamber 11 by the spray gun 91, and secondly, it can also improve the contact efficiency between the urea solution and the flue gas, thereby improving the denitrification rate.

[0041] As another embodiment provided by the present invention, a push portion 61 is provided on the movable shaft 6, and the movable shaft 6 is axially slidably arranged on the shielding seat 3. A guide slope 74 and a resistance portion 73 are provided on the movable seat 7. The movable shaft 6 is driven to slide axially against the guide slope 74 to drive the movable seat 7 to slide relatively away, and the resistance portion 73 moves to resist the side of the spray gun 91.

[0042] Specifically, Figure 3 As shown, the movable shaft 6 is axially slidably arranged on the shielding seat 3 so that the push portion 61 slides in the first sliding groove 32 of the shielding seat 3, thereby further improving the axial sliding stability of the movable shaft 6. The push portion 61 is symmetrically provided with a push slope 611. When the water-cooled wall 2 shakes and pushes the bearing seat 4 to slide, the extrusion portion 42 squeezes the elastic bag 5. The two sides of the elastic bag 5 are compressed and deformed so that the deformation portion 51 in the middle deforms and protrudes toward one side of the shielding seat 3 (as shown in FIG. 1 ). Figure 2 As shown in the figure, the deformation part 51 pushes the movable shaft 6 to slide so that the push part 61 slides to the push slope 611 and contacts the guide slope 74, and then the movable shaft 6 continues to slide to push the shielding seat 3 and the moving seat 7 to slide synchronously along the axial direction of the spray gun 91, until the shielding seat 3 slides to be flush with the nozzle of the spray gun 91, the shielding seat 3 stops sliding, and the movable shaft 6 continues to slide so that the push slope 611 pushes the two moving seats 7 to slide away from each other through the guide slope 74. Thus, the movable shaft 6 is used to drive the sliding of the shielding seat 3 and the moving seat 7 in sections, ensuring that the scratch tip 71 of the moving seat 7 can first move to align with the nozzle of the spray gun 91 and then radially scratch and clean the nozzle of the spray gun 91, thereby improving the safety of cleaning the nozzle of the spray gun 91.

[0043] Secondly, after the two moving seats 7 slide away from each other relatively so that the scraping tip 71 scrapes and cleans the nozzle of the spray gun 91, the sliding of the moving seat 7 also causes the abutting portion 73 to move and abut against the side surface of the spray gun 91, thereby realizing the clamping of the spray gun 91 by the moving seat 7 and the shielding seat 3, reducing the vibration of the spray gun 91 during the spraying solution process, and secondly, it can also avoid the impact problem between the scraping tip 71 and the spray gun 91 caused by the axial vibration of the shielding seat 3 by the spray gun 91, further improving the protection of the spray gun 91.

[0044] As another embodiment provided by the present invention, it further includes a sliding rod 8 axially slidably arranged on the movable shaft 6. The sliding rod 8 is in a default state so that the secondary push block 81 arranged thereon is flush with the pushing portion 61. The secondary push block 81 is symmetrically provided with fitting portions 82, and the moving seat 7 is provided with fitting grooves 76. The pushing portion 61 pushes the moving seat 7 to slide away relatively to the maximum stroke so that the fitting portions 82 are fitted into the fitting grooves 76.

[0045] Specifically, as Figure 7 shown, the sliding rod 8 is axially slidably arranged on the movable shaft 6, and a receiving groove 62 is provided on the pushing portion 61 of the movable shaft 6. The sliding rod 8 is located inside the movable shaft 6 in the default state so that the secondary push block 81 is located in the receiving groove 62, and the secondary push block 81 is flush with the pushing portion 61. When the movable shaft 6 slides so that the pushing slope 611 pushes the two moving seats 7 to slide away relatively through the guiding slope 74, the sliding rod 8 slides synchronously with the movable shaft 6 so that the secondary push block 81 and the pushing slope 611 synchronously push the moving seat 7. When the moving seat 7 is pushed by the movable shaft 6 to move to the maximum stroke of relative sliding away, the pushing portion 61 and the secondary push block 81 enter between the two moving seats 7, and the fitting portion 82 of the secondary push block 81 is fitted into the fitting groove 76 of the moving seat 7. Thereby, the secondary push block 81 is used to improve the stability of the annular channel formed by the shielding hole 721 of the moving seat 7 in front of the nozzle of the spray gun 91.

[0046] When the elastic bladder 5 is elastically reset to pull the movable shaft 6 to first slide on the shielding seat 3, since the secondary push block 81 of the sliding rod 8 still remains clamped through the fitting portion 82 and the fitting groove 76, the sliding rod 8 axially slides out relative to the movable shaft 6, so that the moving seat 7 can still be maintained at the position of sliding away to the maximum stroke, thereby increasing the holding time of the shielding hole 721 and the air inlet hole 722 of the moving seat 7 at the nozzle of the spray gun 91, thereby improving the protection of the spray gun 91 and the atomization efficiency.

[0047] Until the movable shaft 6 is driven by the elastic bladder 5 to continue to axially slide until the engaging portion 82 and the engaging groove 76 are disengaged, the two movable seats 7 are driven by the elastic member 92 to slide relatively close to each other and reset. At this time, the guiding slope 74 moves to push against the secondary push block 81 to drive the sliding rod 8 to slide back towards the movable shaft 6 to the default state. The movable shaft 6 also pulls the shielding seat 3 to slide closer to the water-cooled wall 2. Therefore, when the sliding rod 8 slides back to the default state, it will also impact the movable shaft 6, thereby applying a secondary accelerating force to the movable shaft 6 and the shielding seat 3 to slide towards the water-cooled wall 2, so that the shielding seat 3 can knock and remove the urea crystals adhering to the spray gun 91 during the sleeving and sliding process, further improving the protection of the spray gun 91.

[0048] Working principle: When the flow rate in the water-cooled wall 2 is stable, the elastic bladder 5 is driven by its own elasticity to push against the bearing seat 4 and slide against the water-cooled wall 2. The elastic bladder 5 also pulls the shielding seat 3 to abut against the water-cooled wall 2 through the movable shaft 6. The spray gun 91 atomizes and sprays urea solution into the furnace cavity 11. The flue gas flows into the shielding hole 721 from the air inlet hole 722 and flows along the inner wall of the shielding hole 721 and changes direction. Subsequently, part of the flue gas horizontally impacts the upper side of the vertical direction at the nozzle position of the spray gun 91 through the air outlet hole 723. When the fluid flow rate in the water-cooled wall 2 changes greatly, the two sides of the elastic bladder 5 are compressed and deformed so that the middle deformation part 51 bulges outwards. The deformation part 51 pushes the shielding seat 3 to slide away from the water-cooled wall 2 through the movable shaft 6, thereby temporarily releasing the fixation of the water-cooled wall 2. The two sides of the elastic bladder 5 are compressed and deformed so that the middle deformation part 51 bulges outwards. The deformation part 51 pushes the movable shaft 6 to slide so that the pushing part 61 slides to contact the guiding slope 74. Subsequently, the movable shaft 6 continues to slide to push the shielding seat 3 and the movable seat 7 to slide synchronously along the axial direction of the spray gun 91 until the shielding seat 3 slides to be flush with the nozzle of the spray gun 91. Then, the shielding seat 3 stops sliding, and the movable shaft 6 continues to slide so that the pushing slope 611 pushes the two movable seats 7 to slide relatively away through the guiding slope 74, so that the scraping tip 71 moves and scrapes the nozzle of the spray gun 91 along the radial direction of the spray gun 91. Subsequently, the narrow end of the shielding hole 721 of the movable seat 7 is aligned with the nozzle end of the spray gun 91. At this time, the shielding part 72 is located in front of the spray gun 91 to form an annular spray passage with an increasing radial value, and the flue gas will enter along the tangential direction of the shielding hole 721 from the air inlet hole 722 and form an annular accelerating air flow in the shielding hole 721. When the elastic bladder 5 is reset by its own elasticity to pull the movable shaft 6 to slide on the shielding seat 3 first, the secondary push block 81 still remains clamped through the engaging portion 82 and the engaging groove 76, so that the sliding rod 8 axially slides and extends relative to the movable shaft 6, so that the shielding hole 721 and the air inlet hole 722 of the movable seat 7 are maintained at the nozzle of the spray gun 91 until when the movable shaft 6 is driven by the elastic bladder 5 to continue to axially slide until the engaging portion 82 and the engaging groove 76 are pulled apart, the two movable seats 7 are driven by the elastic member 92 to slide relatively close to each other to reset, and the guiding slope 74 moves to push against the secondary push block 81 to drive the sliding rod 8 to accelerate and slide back to the movable shaft 6 to the default state and hit the movable shaft 6.

[0049] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A SNCR flue gas denitrification system for waste incineration power generation, characterized in that: The invention comprises a furnace wall (1) and a shielding seat (3), wherein a water-cooled wall (2) and a spray gun (91) are arranged on the furnace wall (1), wherein the spray gun (91) passes through a through slot (21) of the water-cooled wall (2) to extend into a furnace cavity (11) of the furnace wall (1), and wherein a blocking portion (31) is arranged on the shielding seat (3), wherein the blocking seat (3) is sleeved on the spray gun (91) to be located in the furnace cavity (11) to block the through slot (21), and the blocking portion (31) contacts the inner side of the through slot (21).

2. The SNCR flue gas denitrification system for waste incineration power generation according to claim 1 is characterized in that: The furnace wall (1) is provided with an elastic bag (5) and a support seat (4) abutting against the elastic bag (5); the support seat (4) is provided with a supporting portion (41); the shielding seat (3) is axially slidably sleeved on the spray gun (91); and the shielding seat (3) is provided with a movable shaft (6); the movable shaft (6) is fixedly connected to the elastic bag (5) so that the elastic bag (5) drives the supporting portion (41) of the support seat (4) and the shielding seat (3) to be clamped on both sides of the water-cooled wall (2).

3. The SNCR flue gas denitrification system for burning garbage for power generation according to claim 2 is characterized in that: A movable seat (7) is symmetrically arranged on the shielding seat (3), and a scratching tip (71) is arranged on the movable seat (7). The shielding seat (3) is driven to slide along the axial direction of the spray gun (91) so that the scratching tip (71) moves first to scratch the side of the spray gun (91).

4. The SNCR flue gas denitrification system for burning garbage for power generation according to claim 3 is characterized in that: The movable seat (7) is relatively slidably arranged on the shielding seat (3), and the shielding seat (3) is driven to slide until it is flush with the nozzle of the spray gun (91) so that the movable seat (7) slides away relatively, and the scratching tip (71) moves to scratch the nozzle of the spray gun (91).

5. The SNCR flue gas denitrification system for waste incineration power generation according to claim 4 is characterized in that: The movable seat (7) is provided with a truncated cone-shaped shielding portion (72), and the shielding portion (72) is provided with a bucket-shaped shielding hole (721). The movable seat (7) slides relatively away from each other so that the shielding portion (72) and the spray gun (91) are coaxial, and a narrow end of the shielding hole (721) is aligned with a nozzle end of the spray gun (91).

6. The SNCR flue gas denitrification system for burning garbage for power generation according to claim 5, characterized in that: The shield portion (72) is provided with an air inlet hole (722) and an air outlet hole (723) which are connected to the shield hole (721) along a tangent direction of the inner wall of the shield hole (721); a first end of the air inlet hole (722) faces toward the direction of smoke from the furnace cavity (11), and a first end of the air outlet hole (723) faces toward the nozzle of the spray gun (91).

7. The SNCR flue gas denitrification system for waste incineration power generation according to claim 4, characterized in that: The movable shaft (6) is provided with a push portion (61), the movable shaft (6) is axially slidably provided on the shielding seat (3), the movable seat (7) is provided with a guide slope (74) and a push portion (73), the movable shaft (6) is driven to axially slide against the guide slope (74) to drive the movable seat (7) to slide relatively away, and the push portion (73) moves to push against the side of the spray gun (91).

8. The SNCR flue gas denitrification system for waste incineration power generation according to claim 7, characterized in that: The invention also comprises a slide bar (8) axially slidably arranged on the movable shaft (6), the slide bar (8) being in a default state so that a secondary push block (81) arranged thereon is flush with the push portion (61), the secondary push block (81) is symmetrically provided with an engaging portion (82), the movable seat (7) is provided with an engaging groove (76), the push portion (61) pushes the movable seat (7) to slide relatively away to a maximum stroke so that the engaging portion (82) is engaged in the engaging groove (76).

9. The SNCR flue gas denitrification system for waste incineration power generation according to claim 2, characterized in that: The elastic bag (5) is provided with a deformable portion (51), the support seat (4) is slidably arranged so that the extrusion portion (42) provided thereon abuts against the elastic bag (5), and the first end of the movable shaft (6) passes through a through hole (44) provided on the support seat (4) to be fixedly connected to the deformable portion (51).

10. The SNCR flue gas denitrification system for waste incineration power generation according to claim 4, characterized in that: The movable seat (7) is provided with a sliding portion (75), the sliding portion (75) being slidably arranged in a second sliding groove (33) provided on the shielding seat (3), and the sliding portion (75) is provided with an elastic member (92) for driving the movable seat (7) to slide relatively, close together and reset.

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