CN110038430B - Denitration process and denitration system - Google Patents

Denitration process and denitration system Download PDF

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Publication number
CN110038430B
CN110038430B CN201910395798.7A CN201910395798A CN110038430B CN 110038430 B CN110038430 B CN 110038430B CN 201910395798 A CN201910395798 A CN 201910395798A CN 110038430 B CN110038430 B CN 110038430B
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China
Prior art keywords
flue
flue gas
air
inlet pipe
denitration
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CN201910395798.7A
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Chinese (zh)
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CN110038430A (en
Inventor
赵春山
蔡丽萍
王洪军
江远军
马韶慧
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Ningbo Liantong Equipment Group Co ltd
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Ningbo Liantong Equipment Group Co ltd
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Priority to CN201910395798.7A priority Critical patent/CN110038430B/en
Publication of CN110038430A publication Critical patent/CN110038430A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8631Processes characterised by a specific device

Abstract

The invention provides a denitration process and a denitration system, and relates to the technical field of flue gas denitration treatment. It includes the flue, set up in the support of flue one side, one end is rotated and is connected the other end on the support and rotate the air-supply line of connecting in the flue end wall, the rotation drive assembly of drive air-supply line positive and negative rotation, set up the spray set in the air-supply line, and set up the catalytic reaction subassembly in the flue, flue and air-supply line butt joint department are provided with the sealing member, rotation drive assembly includes first motor, the gear of being connected with first motor, and the outer ring gear with gear engagement, the one end of flue and air-supply line butt joint department is provided with the deep bead, the ventilation hole has all been seted up on two deep beads, and be formed with the space bar that can seal another deep bead upper vent hole between two adjacent ventilation holes on arbitrary deep bead, the flue gas gets into in the air-. The method has the beneficial effect of enabling the denitration process to be more thorough.

Description

Denitration process and denitration system
Technical Field
The invention relates to the technical field of flue gas denitration treatment, in particular to a denitration process and a denitration system.
Background
The flue gas can be produced in the chemical plant in the process of production, wherein a part of the flue gas is nitrogen oxide, the nitrogen oxide is combined with water in the air and finally converted into nitric acid and nitrate, and the nitric acid is one of the causes of acid rain, so the flue gas can be subjected to denitration reaction treatment in advance before being discharged, the denitration reaction refers to the process of removing the nitrogen oxide in the flue gas, and the flue gas after the treatment can be discharged after the quality of the flue gas reaches the standard.
Chinese patent with publication number CN106512681A discloses a denitration device, which comprises a tower body, wherein a flue gas inlet and a flue gas outlet are arranged on the tower body, a demister is arranged between the flue gas inlet and the flue gas outlet, the denitration device further comprises a first spraying region and a second spraying region, the first spraying region and the second spraying region are arranged in the tower body, the second spraying region is arranged above the first spraying region, and a gas-liquid separation device is arranged between the first spraying region and the second spraying region. Waste gas passes through the flue gas entry and gets into the tower body, and the denitration is adsorbed for the first time in first spray region, sprays regional gas-liquid separation device through first spray region and second, gets into the second and sprays regional denitration of adsorbing for the second time, and wherein gas-liquid separation device can allow the flue gas to get into the second from first spray region and spray the region, and prevents that the second from spraying regional absorbent solution and getting into first spray region to realize denitration many times.
The above prior art solutions have the following drawbacks: in the denitration process, because the flow velocity of the flue gas is fast, the situation that the flue gas and the sprayed reaction liquid are not mixed timely occurs, and the denitration reaction is incomplete.
Disclosure of Invention
The invention aims to provide a denitration process and a denitration system, which have the effect of enabling a denitration process to be more thorough.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a system for denitration, includes the base, the rigid coupling in flue on the base, still including set up in the support of flue arbitrary end, one end rotate connect in on the support the other end rotate connect in the flue is close the air-supply line of support one side end wall for the drive the rotation drive assembly that the air-supply line just reverses, set up in spray assembly in the air-supply line, and set up in the catalytic reaction subassembly in the flue, the flue with the end wall of air-supply line butt joint department is provided with the sealing member, rotation drive assembly including set up in the first motor on the support, with first motor coaxial coupling's gear, and the rigid coupling in the flue periphery and with gear engagement's outer ring gear, the flue with the one end of air-supply line butt joint department all is provided with the sealing member, two all be equipped with a plurality of ventilation holes along deep bead circumference interval on the deep bead, and a partition board capable of sealing the vent hole on the other wind shield is formed between two adjacent vent holes on any one wind shield.
Through adopting above-mentioned technical scheme, during the flue gas is handled, in letting in the air-supply line with the flue gas that produces in the mill, then rotate drive assembly and drive the air-supply line and carry out the forward and reverse rotation of continuation, at this in-process, spray assembly sprays the aqueous ammonia in the air-supply line, because the temperature of flue gas is higher, the aqueous ammonia evaporates in the air-supply line and forms the ammonia, the ammonia mixes with the nitrogen oxide in the flue gas to take place the reaction and in order to detach it with nitrogen oxide. The air-supply line is at the pivoted in-process, and when the ventilation hole butt joint on two deep beads, the flue gas passes in flowing to the air-supply line from the ventilation hole, and when the ventilation hole on two deep beads rotated to the position department that interlocks each other, the flue gas can't flow to in the flue. Through the intercommunication with ventilation hole intermittent type nature on two deep beads, multiplicable flue gas dwell time in the air-supply line can prolong the mixing time of ammonia and flue gas, can be so that the more even that ammonia and flue gas mix, and the air-supply line drives the synchronous rotation of spray assembly simultaneously and also can make the ammonia mix more evenly with the flue gas, alright make the denitration reaction more thorough.
The invention is further configured to: spray assembly sets up the water pump in the aqueous ammonia storage water tank including the aqueous ammonia storage water tank that is used for holding the aqueous ammonia, along flue gas flow direction in proper order the rigid coupling in air-supply line inner wall and with a plurality of logical water ring of aqueous ammonia storage water tank intercommunication, each lead to water and encircle the upper edge lead to water ring perisporium interval and be provided with a plurality of atomizer, and a plurality of one end with the atomizer intercommunication other end with the inlet tube of water pump intercommunication.
Through adopting above-mentioned technical scheme, when spray assembly sprayed the aqueous ammonia, for the water pump take the aqueous ammonia in the aqueous ammonia storage water tank out to the inlet tube in, flow to atomizer by the inlet tube again in, again by atomizer blowout aqueous ammonia. Make spun aqueous ammonia be water smoke form through setting up atomizer, can make the aqueous ammonia turn into the ammonia after the instantaneous evaporation, can improve reaction efficiency, also can make the ammonia more even with the flue gas mixture simultaneously.
The invention is further configured to: the inner wall of the air inlet pipe is wavy.
Through adopting above-mentioned technical scheme, the flue gas is when the crest and the trough of air-supply line inner wall, and the velocity of flow of flue gas produces the change, and the flue gas can produce lateral motion when crest and trough department flow simultaneously, can make the flue gas in the air-supply line more even with the ammonia mixture.
The invention is further configured to: the catalytic reaction assembly comprises a plurality of fixing plates and a plurality of catalytic reaction blocks, the fixing plates are arranged on the inner wall of the flue in the direction perpendicular to the flowing direction of flue gas, and the catalytic reaction blocks are arranged on each fixing plate.
Through adopting above-mentioned technical scheme, set up the catalytic reaction subassembly and can accomplish the ammonia and the nitrogen oxide accelerated reaction that do not react in the air-intake pipe and accomplish to guarantee that exhaust flue gas is up to standard.
The invention is further configured to: each the fixed plate is close the flue gas and all is provided with the dust removal subassembly to one side that comes, the dust removal subassembly include the rigid coupling in the fixed frame of flue inner wall, along perpendicular to flue gas flow direction slide connect in fly leaf on the fixed frame, set up in multiunit on the fly leaf blows the piece, and set up in on the fixed frame and be located respectively two sets of guides at fly leaf both ends, the fly leaf both ends all set up in on the guide, be provided with on the fixed frame and be used for driving each the sharp drive assembly that the fly leaf slided.
Through adopting above-mentioned technical scheme, during the dust removal subassembly operation, for the motion of linear drive subassembly drive fly leaf, the part motion of blowing is driven during the fly leaf motion, the in-process of the part motion of blowing is with air transport to the flue in, simultaneously, because thoughtlessly there is more dust in the smoke and dust, the dust is when the catalytic reaction piece, can be attached to catalytic reaction piece surface, influence the catalytic efficiency of catalytic reaction piece, the piece blows off the dust on catalytic reaction piece surface of setting up to blow, can strengthen the catalytic efficiency of catalytic reaction piece.
The invention is further configured to: the linear driving assembly including rotate connect in lead screw on the fixed frame, with lead screw coaxial coupling's second motor, threaded connection in screw nut on the lead screw, and one end with the screw nut rigid coupling, the other end with the switching piece of fly leaf rigid coupling, the lead screw is along being on a parallel with fly leaf direction of motion sets up.
By adopting the technical scheme, when the linear driving assembly drives the movable plate to move, namely the second motor drives the screw rod to rotate, the guide piece has a guide effect on the movable plate, the movable plate is fixedly connected with the adapter block, and the adapter block is fixedly connected with the screw rod nut, so that when the screw rod rotates, the screw rod nut and the screw rod rotate in a threaded manner, and the movable plate can be driven to move along the direction perpendicular to the flow direction of flue gas while the screw rod nut and the screw rod rotate in a threaded manner. The driving mode has simple structure and high stability, and can stop the movable plate at any position.
The invention is further configured to: the fly leaf diapire rotates and is connected with the articulated shaft, the axis of articulated shaft sets up along the perpendicular to flue gas flow direction, blow the piece with the articulated shaft rigid coupling, on the fly leaf in the articulated shaft both sides are provided with the stopper, each the stopper is close one side of blowing the piece all is provided with the bolster.
Through adopting above-mentioned technical scheme, sharp drive assembly drives fly leaf intermittent type nature motion, drives the in-process of fly leaf scram and quick start motion at sharp drive assembly, and the piece of blowing can rotate along the articulated shaft because inertial action, and the piece of blowing is at the pivoted in-process, alright follow different angles and blow the catalytic reaction piece, alright with the dust clearance more thoroughly on the catalytic reaction piece.
The invention is further configured to: the flue lateral wall be provided with the access hole of fixed frame one-to-one, just the access hole is in each fixed frame sets up towards one side that the flue gas came to, each access hole department all is provided with the guard gate.
Through adopting above-mentioned technical scheme, set up the access hole and be convenient for the operation personnel to change the catalytic reaction piece and overhaul sharp drive assembly.
The invention is further configured to: a denitration process comprises the following steps: comprises the following steps:
s1: introducing the flue gas into an air inlet pipe, spraying the ammonia water in an ammonia water storage tank into the air inlet pipe, and mixing with the flue gas to obtain mixed flue gas;
s2: and introducing the mixed flue gas into a flue to perform a reduction reaction.
Through adopting above-mentioned technical scheme, when the flue gas got into in the air-intake pipe, spray assembly jetted the aqueous ammonia in the air-intake pipe, and the aqueous ammonia evaporates for the ammonia in the air-intake pipe, and the nitrogen oxide in the flue gas takes place to act on with the ammonia and gets rid of the nitrogen oxide in the flue gas, and when the flue gas flowed to catalytic reaction subassembly department, the catalytic reaction subassembly accelerated the unreacted ammonia in the flue gas and the nitrogen oxide reaction, alright get rid of remaining nitrogen oxide in the flue gas. The purification mode can remove the nitrogen oxides in the flue gas more thoroughly.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the flue and the air inlet pipe are communicated in an intermittent manner, so that the reaction time of the flue gas and the ammonia gas in the air inlet pipe is prolonged, the reaction rate of the flue gas and the ammonia gas is improved, and the nitrogen oxide in the flue gas is removed more thoroughly;
2. the inner wall of the air inlet pipe is wave-shaped, so that the ammonia gas and the nitric oxide in the flue gas can react more thoroughly;
3. the dust removal assembly is arranged to blow away dust adsorbed on the catalytic reaction block, so that the fast catalytic effect of catalytic reaction is guaranteed.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
3 fig. 3 2 3 is 3 a 3 schematic 3 sectional 3 view 3 of 3 the 3 plane 3 a 3- 3 a 3 in 3 fig. 3 1 3. 3
Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic diagram of an exploded structure of a catalytic reaction module according to the present invention.
Fig. 5 is a schematic sectional view of the plane B-B in fig. 1.
Fig. 6 is a first perspective view of the dust removing assembly of the present invention, and is intended to show the structure of the linear driving assembly.
Fig. 7 is a schematic view of a second perspective structure of the dust removing assembly of the present invention, which is intended to show the structure of the blowing part.
In the figure, 1, a base; 2. a flue; 21. a docking ring; 211. a sealing groove; 212. a seal member; 22. an access hole; 23. a protective door; 3. a support; 4. an air inlet pipe; 41. a butt joint groove; 42. a wind deflector; 421. a vent hole; 5. a rotation drive assembly; 51. a first motor; 52. a gear; 53. an outer ring gear; 54. a fixed seat; 6. a spray assembly; 61. an ammonia water storage tank; 62. a water-through ring; 63. an atomizing spray head; 64. a water inlet pipe; 7. a catalytic reaction assembly; 71. a fixing plate; 711. a through hole; 712. a limiting hole; 72. a catalytic reaction block; 8. a dust removal assembly; 81. a fixing frame; 82. a movable plate; 83. a blowing member; 84. a guide member; 841. a guide rail; 842. a guide block; 85. a hinged seat; 86. hinging a shaft; 87. a ventilation box; 871. mounting grooves; 872. a fan; 88. a gas delivery pipe; 89. a limiting block; 891. a buffer member; 9. a linear drive assembly; 91. a rotating seat; 92. a screw rod; 93. a lead screw nut; 94. a second motor; 95. and (6) switching the blocks.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the denitration system disclosed by the invention comprises a base 1, a flue 2 fixedly connected to the base 1, a support 3 arranged at any end of the flue 2, an air inlet pipe 4 with one end rotatably connected to the support 3 and the other end rotatably connected to the end wall of the flue 2 close to one side of the support 3, a rotation driving assembly 5 for driving the air inlet pipe 4 to rotate forward and backward, a spraying assembly 6 arranged in the air inlet pipe 4, and a catalytic reaction assembly 7 arranged in the flue 2, wherein the inner wall of the air inlet pipe 4 is wavy.
Referring to fig. 1 and 3, a sealing member 212 is disposed on an end wall of a butt joint between the flue 2 and the air inlet pipe 4, a butt joint ring 21 is fixedly connected to the end wall of the flue 2 close to the air inlet pipe 4, a butt joint groove 41 for inserting the butt joint ring 21 is disposed on the end wall of the air inlet pipe 4 close to the flue 2, a sealing groove 211 is disposed on the bottom wall of the butt joint ring 21, the sealing member 212 is a sealing ring disposed in the sealing groove 211, the sealing ring is made of rubber, and lubricating grease (not shown in the drawing) is disposed. All welded the deep bead 42 in the one end of flue 2 and air-supply line 4 butt joint department, all be equipped with a plurality of ventilation holes 421 along deep bead 42 circumference interval on two deep beads 42, and be formed with the space bar that can seal ventilation hole 421 on another deep bead 42 between adjacent two ventilation holes 421 on arbitrary deep bead 42, seted up three ventilation hole 421 on each deep bead 42 in this embodiment, and three ventilation hole 421 is along deep bead 42 circumference equipartition.
Referring to fig. 1 and 2, the rotation driving assembly 5 includes a first motor 51 disposed on the support 3, a gear 52 coaxially connected to the first motor 51, and an outer toothed ring 53 fixed to the periphery of the flue 2 and engaged with the gear 52, a fixing seat 54 is welded to the top wall of the support, the first motor 51 is fixed to the fixing seat 54 by screws, and the first motor 51 is a servo motor.
Referring to fig. 1 and 2, spray set 6 is including the aqueous ammonia storage water tank 61 that is used for holding the aqueous ammonia, set up the water pump (not shown in the figure) in aqueous ammonia storage water tank 61, along flue gas flow direction rigid coupling in air-supply line 4 inner wall in proper order and with a plurality of water ring 62 of leading to of aqueous ammonia storage water tank 61 intercommunication, each water ring 62 goes up to have a plurality of atomizer 63 along leading to water ring 62 perisporium interval intercommunication, and a plurality of one end and atomizer 63 intercommunication other end and water pump intercommunication's inlet tube 64, the number of water ring 62 is 3 in this embodiment.
Referring to fig. 2 and 4, the catalytic reaction assembly 7 includes a plurality of fixing plates 71 welded on the inner wall of the flue 2 along the direction perpendicular to the flow of flue gas, and a plurality of catalytic reaction blocks 72 disposed on each fixing plate 71, a plurality of through holes 711 are opened in the vertical direction through the top wall of the fixing plate 71, a limiting hole 712 is opened on the periphery of each through hole 711 on the top wall of the fixing plate 71, the catalytic reaction blocks 72 are clamped in the limiting holes 712, and the catalytic reaction blocks 72 are SCR honeycomb denitration catalysts.
Referring to fig. 5 and 6, a dust removing assembly 8 is disposed on one side of each fixing plate 71, which is close to the flue gas coming from the flue gas coming, and two sets of guide members 84 disposed on the fixed frame 81 and respectively located at both ends of the movable plate 82, each set of guide members 84 including a guide rail 841 fixedly connected to the top wall of the fixed frame 81 in a direction perpendicular to the flow direction of the flue gas, the guide rails 841 and the guide blocks 842 are selected from a series of silver-coated linear slide rails 841, two ends of the movable plate 82 are fixedly connected to the guide blocks 842 through screws, two sets of blowing members 83 are disposed on each movable plate 82, and the fixed frame 81 is provided with a linear driving assembly 9 for driving each movable plate 82 to slide.
Referring to fig. 6 and 7, two hinge seats 85 are fixedly connected to the bottom wall of the movable plate 82, a hinge shaft 86 is rotatably connected between the two hinge seats 85, the axis of the hinge shaft 86 is arranged along the direction perpendicular to the flow direction of flue gas, the blowing piece 83 comprises a ventilation box 87 welded on the hinge shaft 86, a fan 872 arranged on the ventilation box 87, and a gas pipe 88 arranged on one side of the ventilation box 87, the gas pipe 88 is made of a soft material, a mounting groove 871 is formed in the side wall of the ventilation box 87 away from the hinge shaft 86, the gas pipe 88 is communicated with the mounting groove 871, and the fan 872 is arranged at the opening of; the bottom wall of the movable plate 82 is welded with limiting blocks 89 at two sides of the hinge shaft 86, each limiting block 89 is provided with a buffer member 891 at one side close to the blowing piece 83, and the buffer member 891 in the embodiment is an oil buffer.
Referring to fig. 6 and 7, two rotating bases 91 are welded on the top wall of the fixed frame 81, the two fixed bases 54 are arranged in a direction perpendicular to the flow direction of flue gas, the linear driving assembly 9 includes a screw rod 92 with two ends respectively rotatably connected to the two rotating bases 91, a second motor 94 coaxially connected with the screw rod 92, a screw nut 93 screwed on the screw rod 92, and a switching block 95 with one end fixedly connected with the screw nut 93 and the other end fixedly connected with the movable plate 82, and the second motor 94 is a servo motor.
Referring to fig. 1, 2 lateral walls of flue are provided with the access hole 22 with fixed frame 81 one-to-one, and the access hole 22 is in the fixed frame 81 of each and comes to one side setting towards the flue gas, and each access hole 22 department all is provided with guard gate 23, and each guard gate 23 all hinges in access hole 22 department through the hinge.
A denitration process having the steps of: s1: and (3) introducing the flue gas into the air inlet pipe 4, spraying the ammonia water in the ammonia water storage tank 61 into the air inlet pipe 4, and mixing with the flue gas to obtain mixed flue gas. After the flue gas is introduced into the air inlet pipe 4, the rotating driving component 5 drives the air inlet pipe 4 to rotate. When the rotation driving assembly 5 drives the air inlet pipe 4 to rotate, namely the first motor 51 drives the gear 52 to rotate, the gear 52 drives the outer toothed ring 53 meshed with the gear to rotate when rotating, the outer toothed ring 53 drives the two ends of the air inlet pipe 4 to rotate along the end wall of the flue 2 and the bracket 3 respectively when rotating, when the first motor 51 drives the outer toothed ring 53 to rotate, the outer toothed ring 53 is driven to rotate forwards for one circle each time and then rotates backwards for one circle, and then the process is repeated, so that the rotation state of the air inlet pipe 4 is forward and reverse. In the process of rotating the air inlet pipe 4, when the vent holes 421 on the two wind shields 42 are overlapped, the flue gas flows into the flue 2 from the air inlet pipe 4, and when the vent holes 421 on the two wind shields 42 are in a staggered state, the flue gas stays in the air inlet pipe 4.
When the spray assembly 6 sprays ammonia water into the air inlet pipe 4, the water pump pumps the ammonia water in the ammonia water storage tank 61 out to the water inlet pipe 64, the ammonia water in the water inlet pipe 64 flows to the water passing ring 62, and then is sprayed into the air inlet pipe 4 through the atomizing nozzles 63, the atomizing nozzles 63 drive the water passing ring 62 to synchronously rotate in the process of spraying the ammonia water, the water passing ring 62 drives the atomizing nozzles 63 to synchronously rotate when rotating, so that the ammonia water can be uniformly sprayed into the air inlet pipe 4, the ammonia gas sprayed out by the atomizing nozzles 63 is in a water mist shape, and the temperature of the flue gas is higher, so that the water mist ammonia water is instantly evaporated to form ammonia gas and then reacts with nitrogen oxides in the flue gas, and the nitrogen oxides in the flue gas can be removed.
S2: introducing the mixed flue gas into a flue 2 for reduction reaction; when the nitrogen oxides and ammonia gas that have not been reacted flow to the catalytic reaction assembly 7, the catalytic reaction block 72 provides a catalyst for the denitration reaction, and accelerates the denitration reaction rate.
The linear driving assembly 9 drives the blowing piece 83 to move along the direction perpendicular to the flowing direction of the flue gas, the blowing piece 83 provides oxygen into the flue 2, and meanwhile, the blowing piece 83 blows out dust on the catalytic reaction block 72; because the flue gas is mixed with the dust, when the flue gas flows to the catalytic reaction block 72, part of the smoke dust is attached to the surface of the catalytic reaction block 72, and after the surface of the catalytic reaction block 72 is contaminated by the dust, the blowing piece 83 blows air to the catalytic reaction block 72 at the moment, so that the dust attached to the catalytic reaction block 72 is blown off, and meanwhile, air can be conveyed into the flue 2, so that oxygen required in the denitration reaction process is ensured. When the blowing member 83 blows air into the flue 2, that is, the air flows into the ventilation box 87 along the air pipe 88, the blower 872 operates to convey the air in the ventilation box 87 into the flue 2. In the process of conveying air by the blowing part 83, the linear driving assembly 9 drives the blowing part 83 to move along the direction perpendicular to the flow direction of the flue gas, that is, the second motor 94 drives the screw rod 92 to rotate, here, the guide part 84 has a guiding effect on the movable plate 82, the movable plate 82 is fixedly connected with the adapter block 95, and the adapter block 95 is fixedly connected with the screw nut 93, so that when the screw rod 92 rotates, the screw nut 93 and the screw rod 92 can rotate relatively, when the screw nut 93 rotates along the screw rod 92, the movable plate 82 can be driven to slide along the guide rail 841, when the movable plate 82 moves, the blowing part 83 can be driven to synchronously move, and when the blowing part 83 moves, the catalytic reaction blocks 72 at different positions can be cleaned up. When the second motor 94 drives the screw rod 92 to rotate, the screw rod 92 is intermittently driven to rotate, that is, the movable plate 82 is intermittently driven to move, when the movable plate 82 stops suddenly or starts to move again, the blowing piece 83 can drive the hinge shaft 86 to rotate along the hinge seat 85 due to the inertia effect, so that the catalytic reaction block 72 can be blown at different angles, when the blowing piece 83 rotates, two ends of the blowing piece 83 collide with the buffer piece 891 to rotate in the opposite direction, and the catalytic reaction block 72 can be blown from more directions.
Opening the protective door 23 to enter the catalytic reaction block 72 in the flue 2 from the access opening 22 for maintenance; when the catalytic reaction block 72 is invalid, when the catalytic reaction block 72 needs to be replaced, the catalytic reaction block 72 can be replaced by opening the protective door 23, and meanwhile, the linear driving assembly 9 can also be overhauled and maintained.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (4)

1. The utility model provides a system for denitration, includes base (1), the rigid coupling in flue (2) on base (1), its characterized in that: the device is characterized by further comprising a support (3) arranged at any end of the flue (2), one end of the support is rotatably connected to the support (3), the other end of the support is rotatably connected to the air inlet pipe (4) close to the end wall of one side of the support (3), a rotary driving component (5) for driving the forward and reverse rotation of the air inlet pipe (4), a spraying component (6) arranged in the air inlet pipe (4) and a catalytic reaction component (7) arranged in the flue (2), a sealing element (212) is arranged at the end wall of the butt joint of the flue (2) and the air inlet pipe (4), the rotary driving component (5) comprises a first motor (51) arranged on the support (3), a gear (52) coaxially connected with the first motor (51) and an outer toothed ring (53) fixedly connected to the periphery of the flue (2) and meshed with the gear (52), air baffles (42) are arranged at one end of the joint of the flue (2) and the air inlet pipe (4), a plurality of vent holes (421) are formed in the two air baffles (42) at intervals along the circumferential direction of the air baffles (42), and a partition plate capable of closing the vent holes (421) in the other air baffle (42) is formed between every two adjacent vent holes (421) in any air baffle (42); the spraying assembly (6) comprises an ammonia water storage tank (61) for containing ammonia water, a water pump arranged in the ammonia water storage tank (61), a plurality of water through rings (62) which are fixedly connected to the inner wall of the air inlet pipe (4) in sequence along the flow direction of flue gas and communicated with the ammonia water storage tank (61), a plurality of atomizing spray heads (63) are arranged on each water through ring (62) at intervals along the peripheral wall of the water through ring (62), and a plurality of water inlet pipes (64) with one ends communicated with the atomizing spray heads (63) and the other ends communicated with the water pump;
the inner wall of the air inlet pipe (4) is wavy;
the catalytic reaction assembly (7) comprises a plurality of fixing plates (71) which are arranged on the inner wall of the flue (2) along the direction vertical to the flowing direction of the flue gas, and a plurality of catalytic reaction blocks (72) which are arranged on each fixing plate (71);
a dust removal assembly (8) is arranged on one side, close to the coming direction of flue gas, of each fixed plate (71), each dust removal assembly (8) comprises a fixed frame (81) fixedly connected to the inner wall of the flue (2), a movable plate (82) connected to the fixed frame (81) in a sliding manner along the direction perpendicular to the flowing direction of the flue gas, a plurality of groups of blowing pieces (83) arranged on the movable plate (82), and two groups of guide pieces (84) arranged on the fixed frame (81) and respectively positioned at two ends of the movable plate (82), two ends of the movable plate (82) are arranged on the guide pieces (84), and a linear driving assembly (9) used for driving each movable plate (82) to slide is arranged on the fixed frame (81);
the flue gas purification device is characterized in that the bottom wall of the movable plate (82) is rotatably connected with an articulated shaft (86), the axis of the articulated shaft (86) is arranged along the direction perpendicular to the flow direction of flue gas, the blowing piece (83) is fixedly connected with the articulated shaft (86), the movable plate (82) is provided with limiting blocks (89) on two sides of the articulated shaft (86), and each limiting block (89) is close to one side of the blowing piece (83) and is provided with a buffer piece (891).
2. The system for denitration of claim 1, wherein: linear drive assembly (9) including rotate connect in lead screw (92) on fixed frame (81), with lead screw (92) coaxial coupling's second motor (94), threaded connection in lead screw nut (93) on lead screw (92), and one end with lead screw nut (93) rigid coupling, the other end with switching piece (95) of fly leaf (82) rigid coupling, lead screw (92) along being on a parallel with fly leaf (82) direction of motion sets up.
3. The system for denitration of claim 1, wherein: flue (2) lateral wall be provided with access hole (22) of fixed frame (81) one-to-one, just access hole (22) in each fixed frame (81) come to one side setting, each towards the flue gas access hole (22) department all is provided with guard gate (23).
4. A denitration process produced by using the denitration system according to any one of claims 1 to 3, characterized in that: comprises the following steps:
s1: introducing the flue gas into an air inlet pipe (4), spraying ammonia water in an ammonia water storage tank (61) into the air inlet pipe (4) and mixing with the flue gas to obtain mixed flue gas;
s2: the mixed flue gas is introduced into the flue (2) for reduction reaction.
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