Ammonia spraying device for SCR (Selective Catalytic Reduction) denitration

Abstract

The invention relates to the technical field of flue gas denitration, in particular to an ammonia spraying device for SCR denitration, which comprises a reactor shell, an air pipe, an ammonia spraying component, a catalyst module, an overturning component and an air valve cleaning component, the air pipe is connected with the reactor shell, the catalyst module is arranged in the reactor shell, the ammonia spraying component is arranged in the air pipe, and the overturning component is connected with the air valve cleaning component. The catalyst module is used for increasing the reaction rate of materials, the overturning component is used for adjusting the angle of the catalyst module, and the gas valve cleaning component is used for cleaning the catalyst module. Airflow is disturbed through the ammonia spraying component, the mixing effect of flue gas and ammonia water is improved, the denitration efficiency can be improved, and the ammonia escape rate can be reduced; multi-station dust removal of the catalyst module can be achieved through the overturning component and the air valve cleaning component, front and back dust removal of the catalyst module can also be achieved, the dust removal efficiency is high, the structure is simple, operation is convenient, and economy and applicability are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas denitration, and particularly relates to a device for spraying ammonia in SCR (Selective Catalytic Reduction) denitration. BACKGROUND

[0002] The selective catalytic reduction (SCR) denitration technology has the advantages of high efficiency, good selectivity, stable and reliable operation, and the like, and has been widely applied in China. The principle of the SCR flue gas denitration is that ammonia-containing air is sprayed into flue gas under the action of a catalyst, so that NOx in the flue gas is reduced to nitrogen and water, thereby effectively avoiding secondary pollution to the environment.

[0003] At present, the Chinese application with the application number 201510406995.6 discloses a device for preventing blocking of an ammonia spraying grid in an SCR denitration system. Although the outlet air of an ammonia dilution fan is mixed with ammonia gas in a mixer after being heated by a heater, and since the temperature of the ammonia-containing air is higher than the dew point of ammonium bisulfate, the deposition and adhesion of liquid ammonium bisulfate to fly ash are effectively prevented, thereby preventing the blocking of the spray nozzles on the ammonia spraying grid and solving the problem of blocking of the spray nozzles, the uniform mixing effect of ammonia water and flue gas is still not good, the catalyst surface is prone to be clogged with dust, and timely cleaning is required. SUMMARY

[0004] The technical problem to be solved by the present application is that the uniform mixing degree of ammonia gas and flue gas will directly affect the operation efficiency and operation effect of the denitration system. When the mixing effect is not good, the denitration efficiency is low, the ammonia escape rate is high, the operation resistance of the air preheater is increased, and the like, and the safe and stable operation of the boiler main machine is seriously affected.

[0005] The catalyst surface is prone to be clogged with dust and needs to be cleaned in time.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a device for spraying ammonia in SCR denitration, comprising a reactor shell, an air pipe, an ammonia spraying member, a catalyst module, a turnover member and a gas valve cleaning member.

[0007] The air pipe is connected to the reactor shell, the catalyst module is arranged in the reactor shell, and the ammonia spraying member is arranged in the air pipe.

[0008] The catalyst module is used to accelerate the reaction rate of the material.

[0009] The turnover member is used to adjust the angle of the catalyst module.

[0010] The gas valve cleaning member is used to clean the catalyst module.

[0011] As a preferred scheme of the SCR denitration ammonia injection device, the ammonia injection member comprises an ammonia injection main pipe, an arc-shaped branch pipe, a four-way pipe, a power generation assembly and a grid support, the ammonia injection main pipe is connected with the arc-shaped branch pipe, the four-way pipe is connected with the ammonia injection main pipe and the arc-shaped branch pipe, the ammonia injection main pipe is fixedly connected with the power generation assembly, the power generation assembly is fixedly connected with the grid support, and the grid support is fixedly connected with the inner wall of the air pipe.

[0012] As a preferred scheme of the SCR denitration ammonia injection device, the turning member comprises a motor, a rocker, a second sliding block, a pull ring, a straight rack, a turning assembly and a sliding rail, the power generation assembly is electrically connected with the motor, the output shaft of the motor is rotationally connected with the rocker, the rocker is fixedly connected with the sliding block, the second sliding block is slidingly connected with the pull ring, the pull ring is fixedly connected with the straight rack, and the straight rack is slidingly connected with the sliding rail.

[0013] As a preferred scheme of the SCR denitration ammonia injection device, the turning assembly comprises three groups, and each turning assembly comprises a gear, a rotating shaft and a support frame, the gear is meshingly connected with the straight rack, the gear is fixedly connected with the rotating shaft, the rotating shaft is fixedly connected with the support frame, and the support frame is fixedly connected with the catalyst module.

[0014] As a preferred scheme of the SCR denitration ammonia injection device, the air valve cleaning member comprises a moving module, a fixed disc, a pulse blowing assembly, a blowing pipe, a third sliding block and a sealing plate, the moving module is fixedly connected with the blowing pipe, the blowing pipe is fixedly connected with the third sliding block, the third sliding block is slidingly connected with the sealing plate, and the sealing plate is fixedly connected with the inner wall of the reactor shell.

[0015] As a preferred scheme of the SCR denitration ammonia injection device, the moving module comprises a first push rod, an L-shaped limiting cavity, a connecting rod, an articulated rod, a second push rod and a range increasing assembly, one end of the first push rod is fixedly connected with the straight rack, the other end of the first push rod is articulated with one end of the connecting rod, the other end of the connecting rod is articulated with one end of the second push rod, one end of the articulated rod is articulated on the L-shaped limiting cavity, the articulated rod is located at the right angle position of the L-shaped limiting cavity, the other end of the articulated rod is articulated in the middle of the connecting rod, and the other end of the second push rod is fixedly connected with the range increasing assembly.

[0016] As a preferred scheme of the SCR denitration ammonia injection device, the range increasing assembly comprises a hinge, a first connecting rod, a second connecting rod, a first sliding block, a sliding groove and a base plate, the second push rod is fixedly connected with the hinge, a sliding groove is formed in one end of the first connecting rod, the hinge is slidably connected in the sliding groove of the first connecting rod, the other end of the first connecting rod is hingedly connected with one end of the second connecting rod, the other end of the second connecting rod is rotatably connected with the first sliding block, the first sliding block is slidably connected with the sliding groove, the sliding groove is fixedly connected with the base plate, and the base plate is fixedly connected with the inner wall of the reactor shell.

[0017] As a preferred scheme of the SCR denitration ammonia injection device, the pull ring is provided with a second sliding groove matched with the second sliding block, and the sliding rail is provided with a first sliding groove matched with the straight rack.

[0018] As a preferred scheme of the SCR denitration ammonia injection device, the arc-shaped branch pipes are centrally symmetrically arranged at two ends of the four-way pipe, and the inclined surface of the arc-shaped branch pipe is provided with a first gas hole.

[0019] As a preferred scheme of the SCR denitration ammonia injection device, the L-shaped limiting cavity is provided with a through hole at a right angle, and the injection pipe is provided with a plurality of second gas holes.

[0020] The present application has the advantages that the ammonia injection member is used to disturb the airflow, improve the mixing effect of the flue gas and ammonia water, improve the denitration efficiency, and reduce the ammonia escape rate, the turnover member and the air valve cleaning member can realize multi-station dust removal of the catalyst module and dust removal of the front and back surfaces of the catalyst module, the dust removal efficiency is high, the structure is simple, the operation is convenient, and the device is economical and applicable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an overall structure schematic diagram of the SCR denitration ammonia injection device.

[0022] Figure 2 It is a structure schematic diagram of the ammonia injection member of the SCR denitration ammonia injection device.

[0023] Figure 3 It is a structure schematic diagram of the range increasing assembly of the SCR denitration ammonia injection device.

[0024] Figure 4 It is a structure schematic diagram of the injection pipe of the SCR denitration ammonia injection device.

[0025] Figure 5 It is a structure schematic diagram of the turnover assembly of the SCR denitration ammonia injection device.

[0026] Figure 6 FIG. 1 is a schematic diagram of a mobile module structure for an SCR denitration ammonia injection device according to an embodiment of the present disclosure.

[0027] Figure 7 FIG. 2 is a schematic diagram of a first chute structure for an SCR denitration ammonia injection device according to an embodiment of the present disclosure.

[0028] Figure 8 FIG. 3 is a schematic diagram of a pull ring structure for an SCR denitration ammonia injection device according to an embodiment of the present disclosure.

[0029] The figure marks: reactor shell 1; air pipe 2; ammonia injection member 3; ammonia injection main pipe 31; arc-shaped branch pipe 32; four-way pipe 33; first air hole 34; power generation assembly 35; grid support 36; catalyst module 4; turnover member 5; motor 51; rocker 52; second sliding block 53; second chute 531; pull ring 54; straight rack 55; first chute 551; turnover assembly 56; gear 561; rotating shaft 562; support frame 563; slide rail 57; air valve cleaning member 6; mobile module 61; first push rod 611; L-shaped limiting cavity 612; connecting rod 613; hinged rod 614; second push rod 615; range increasing assembly 7; hinge 71; first connecting rod 72; sliding groove 721; second connecting rod 73; first sliding block 74; chute 75; base plate 76; fixed disc 62; pulse blowing assembly 63; blowing pipe 64; second air hole 641; third sliding block 65; sealing plate 66. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] Embodiment, refer to Figures 1-8 The embodiment provides an SCR denitration ammonia injection device, which comprises a reactor shell 1, an air pipe 2, an ammonia injection member 3, a catalyst module 4, a turnover member 5 and an air valve cleaning member 6.

[0032] The air pipe 2 is connected to the reactor shell 1, the reactor shell 1 is provided with the catalyst module 4, and the air pipe 2 is provided with the ammonia injection member 3.

[0033] The catalyst module 4 is used for accelerating the reaction rate of the material.

[0034] The turnover member 5 is used for adjusting the angle of the catalyst module 4.

[0035] The air valve cleaning member 6 is used for cleaning the catalyst module 4.

[0036] The device takes the reactor shell 1 as the main bearing structure, and is matched with the five core components of the air pipe 2, the ammonia spraying component 3, the catalyst module 4, the turnover component 5 and the air valve cleaning component 6 to form the complete denitration process of "flue gas transportation-ammonia water mixing-catalytic reaction-cleaning and maintenance".

[0037] The reactor shell 1 is made of metal material with high temperature resistance and corrosion resistance and forms a closed denitration reaction space inside, which is the "frame base" of the whole device. Its core functions include: first, providing fixed mounting points for the catalyst module 4, the turnover component 5 and other key components to ensure the stability of the structure during operation; second, building a closed reaction environment to avoid leakage of flue gas during treatment, and guiding the flue gas to flow along the preset path to ensure sufficient contact with ammonia water and catalyst.

[0038] The air pipe 2 is connected with the industrial flue gas discharge source at one end and is sealingly connected with the flue gas inlet of the reactor shell 1 at the other end, which is the "exclusive channel" for the flue gas to enter the denitration system. Its function is not only limited to flue gas transportation, but also undertakes the preliminary mixing and pretreatment task of flue gas and ammonia water. The ammonia spraying component 3 is specially arranged inside the air pipe 2, so that the flue gas can contact and preliminarily mix with the atomized ammonia water sprayed by the ammonia spraying component 3 when flowing through the air pipe 2, laying a foundation for uniform mixing for the catalytic reaction in the reactor shell 1, and avoiding the problem of incomplete local denitration caused by uneven mixing of flue gas and ammonia water.

[0039] The ammonia spraying component 3 is installed at the key flow channel position inside the air pipe 2, which is the core executive component for realizing the atomization of ammonia water and the preliminary mixing of flue gas. Through the external ammonia supply system, ammonia water is transported to the inside of the component, and after being divided and pressurized by the internal flow channel, it is sprayed uniformly in the form of atomized water mist into the flue gas in the air pipe 2. The atomized ammonia water fully contacts with the high-speed flowing flue gas in the air pipe 2, which can preliminarily adsorb part of the pollutants in the flue gas, and can form a gas-liquid mixed state of ammonia water and flue gas, reducing the reaction blind area of ammonia water and catalyst module 4 after entering the reactor shell 1, and improving the overall denitration efficiency.

[0040] The catalyst module 4 is fixedly installed inside the reactor shell 1 and is located downstream of the flue gas outlet of the air pipe 2. Its core function is to reduce the reaction activation energy of ammonia water and nitrogen oxides in flue gas through the catalytic active sites. When the gas-liquid mixture preliminarily mixed by the air pipe 2 flows through the catalyst module 4, the reaction rate of ammonia water and nitrogen oxides can be increased by tens of times under the action of the catalyst, so that the high-efficiency denitration reaction can be completed in a lower temperature and a shorter time, and the final discharged flue gas can meet the standard.

[0041] The turnover member 5 is installed inside the reactor shell 1 and is in transmission connection with the fixed support of the catalyst module 4. During the denitration reaction process, by adjusting the inclination angle of the catalyst module 4, the flow path and contact time of the gas-liquid mixture on the catalyst surface can be changed, and the reaction efficiency can be optimized; in the subsequent cleaning and maintenance stage, by turning over the catalyst module 4, the dust accumulation areas on the front and back surfaces and edges thereof can be exposed, thereby providing conditions for the dead angle-free cleaning of the air valve cleaning member 6.

[0042] The air valve cleaning member 6 is installed inside the reactor shell 1 near the catalyst module 4 and is usually connected with a compressed air source. Due to the attachment of dust, reaction by-products and other impurities in the flue gas on the surface and internal pores of the catalyst module 4 after long-term use, the catalytic activity is reduced and the flow channel is blocked, and the air valve cleaning member 6 cleans the catalyst module 4 by blowing high-pressure gas flow: it can control the jetting time and intensity of the high-pressure gas flow through the air valve, cooperate with the angle adjustment of the catalyst module 4 driven by the turnover member 5, and blow the front, back, pores and edge areas of the catalyst in all directions, effectively remove dust and impurities, restore the activity of the catalyst and the smoothness of the flow channel, and prolong the service life of the catalyst.

[0043] In the preferred use process of the embodiment, the flue gas enters through the air pipe 2, the ammonia spraying member 3 sprays ammonia water, and the flue gas and water mist-shaped ammonia water preliminarily react, then enters the catalyst module 4. According to Newton's third law: when the gas flows out from one end, it will exert a force on the circumference, pushing the circumference to rotate in the opposite direction of the gas, and the combined force of the two forces will make the circumference rotate around the central axis. The ammonia spraying member 3 can produce rotation, thereby disturbing the airflow and improving the mixing effect of the flue gas and ammonia water. The catalyst module 4 accelerates the reduction of ammonia water on the flue gas. Due to long-term use, the catalyst module 4 is prone to dust accumulation and blockage. The turnover member 5 adjusts the catalyst module 4, thereby facilitating the air valve cleaning member 6 to uniformly and quickly perform air pressure dust removal on the catalyst module 4, realizing multi-station dust removal of the catalyst module 4, which is simple to operate, saves cost, and has high working efficiency.

[0044] Referring to Figure 1 and Figure 2 , the ammonia spraying member 3 includes an ammonia spraying main pipe 31, an arc-shaped branch pipe 32, a four-way pipe 33, a power generation assembly 35 and a grid support 36. The ammonia spraying main pipe 31 is connected with the arc-shaped branch pipe 32, the four-way pipe 33 is connected with the ammonia spraying main pipe 31 and the arc-shaped branch pipe 32, the ammonia spraying main pipe 31 is fixedly connected with the power generation assembly 35, the power generation assembly 35 is fixedly connected with the grid support 36, and the grid support 36 is fixedly connected with the inner wall of the air pipe 2.

[0045] The preferred embodiment of the present application, ammonia into the ammonia injection main pipe 31, through the arc branch pipe 32, and then sprayed water mist gas, because the arc branch pipe 32 both ends of the gas at the same time out of the circle, the force exerted on the arc branch pipe 32, the arc branch pipe 32 rotation disturbance airflow, grid support 36 in the ammonia and flue gas mixed above the formation of temporary barriers, forming a negative pressure zone, improve the mixing effect of the flue gas and ammonia, the arc branch pipe 32 rotation potential energy is stored in the power generation assembly 35, the power generation assembly 35 energy drive turnover component 5 operation.

[0046] Referring to Figure 3 And Figure 5 , the turnover component 5 includes a motor 51, a rocker 52, a second slider 53, a pull ring 54, a straight rack 55, a turnover assembly 56 and a slide rail 57, the motor 51 is electrically connected to the power generation assembly 35, the output shaft of the motor 51 is rotationally connected to the rocker 52, the rocker 52 is fixedly connected to the second slider 53, the second slider 53 is slidably connected to the pull ring 54, the pull ring 54 is fixedly connected to the straight rack 55, and the straight rack 55 is slidably connected to the slide rail 57.

[0047] The motor 51 is the "power core" of the turnover component 5, which is a high-precision servo motor or a stepping motor. The rocker 52 serves as a "power bridge" between the motor 51 and the second slider 53 and has a rod-shaped structure. One end of the rocker 52 is fixedly connected to the output shaft of the motor 51 through a coupling, and the other end is connected to the second slider 53 in a hinged manner. When the output shaft of the motor 51 rotates, the rocker 52 will directly rotate around the output shaft, converting the rotary power of the motor into linear power to drive the second slider 53 to move. The second slider 53 has a block-shaped structure and is provided with a protrusion on the outer side that matches the inner track of the pull ring 54, so as to be able to flexibly slide in the annular track of the pull ring 54. One end of the second slider 53 is hinged to the rocker 52, and the other end is embedded in the track of the pull ring 54. Under the drive of the rocker 52, the second slider 53 can slide back and forth along the track of the pull ring 54, and at the same time, the circular motion of the rocker 52 is converted into the linear motion of the pull ring 54, realizing the conversion of the direction of power transmission.

[0048] The pull ring 54 has a ring-shaped structure and is provided with a groove track on the inner side for the second slider 53 to slide. The pull ring 54 is connected to the straight rack 55 as a whole through bolt fixation. When the second slider 53 slides in the track, the pull ring 54 will synchronously move up and down, and then the sliding power is transmitted to the straight rack 55.

[0049] The straight rack 55 has a long strip-shaped structure and is provided with uniform teeth on the outer side. The two sides of the straight rack 55 match the slide grooves of the slide rail 57 and can slide up and down along the slide rail 57. Under the drive of the pull ring 54, the straight rack 55 can stably move up and down along the slide rail 57, and through the meshing of the teeth and the gear 561 of the turnover assembly 56, the linear motion is converted into the rotary motion of the gear 561, providing power for the turnover assembly 56.

[0050] The turnover assembly 56 is the core component for directly driving the catalyst module 4 to turn over. When the straight rack 55 moves up and down, the gear 561 is driven to rotate reversely, and then the rotating shaft 562 is synchronously rotated, and finally the catalyst module 4 is driven to rotate around the rotating shaft to realize angle turning over, and the multi-station adjustment is completed.

[0051] The slide rail 57 is a long strip structure, which is fixedly installed on the inner wall of the reactor shell 1, and the inner side is provided with a sliding groove matched with the straight rack 55. The main function of the slide rail 57 is to provide guidance and limiting for the up and down movement of the straight rack 55, so as to prevent the straight rack 55 from deviating or shaking during the movement, and to ensure that the straight rack 55 can stably mesh with the gear 561 of the turnover assembly 56, thereby ensuring the operation accuracy of the whole turnover transmission system.

[0052] In the preferred embodiment, when the catalyst module 4 is accumulated with dust and blocked, the motor 51 is started, the motor 51 drives the rocker 52 to rotate, the rocker 52 drives the second sliding block 53 to slide on the pull ring 54, the pull ring 54 drives the straight rack 55 to repeatedly move up and down on the slide rail 57, and the straight rack 55 drives the turnover assembly 56 to rotate during the up and down movement.

[0053] Referring to Figures 4-5 , the turnover assembly 56 has three groups in total, and the turnover assembly 56 comprises the gear 561, the rotating shaft 562 and the support frame 563. The gear 561 is meshingly connected with the straight rack 55, the gear 561 is fixedly connected with the rotating shaft 562, the rotating shaft 562 is fixedly connected with the support frame 563, and the support frame 563 is fixedly connected with the catalyst module 4.

[0054] In the preferred embodiment, the straight rack 55 drives the gear 561 to rotate, the gear 561 drives the rotating shaft 562 to rotate, and the rotating shaft 562 drives the catalyst module 4 to rotate. When the catalyst module 4 rotates to the vertical direction, the gas valve cleaning member 6 can conveniently and efficiently clean the catalyst module 4.

[0055] Referring to Figure 1 and Figure 3 , the gas valve cleaning member 6 comprises the moving module 61, the fixed disc 62, the pulse blowing assembly 63, the blowing pipe 64, the third sliding block 65 and the sealing plate 66. The moving module 61 is fixedly connected with the blowing pipe 64, the blowing pipe 64 is fixedly connected with the third sliding block 65, the third sliding block 65 is slidingly connected with the sealing plate 66, and the sealing plate 66 is fixedly connected with the inner wall of the reactor shell 1.

[0056] In the preferred embodiment, the moving module 61 drives the blowing pipe 64 to move left and right, so as to sufficiently clean the catalyst module 4, thereby preventing the catalyst module 4 from being accumulated with dust and blocked, and affecting the catalytic rate. The sealing plate 66 prevents the gas from directly escaping through the catalyst module 4, thereby reducing the reduction efficiency of the flue gas.

[0057] Referring to Figure 3 andFigure 6 The moving module 61 comprises a first push rod 611, an L-shaped limiting cavity 612, a connecting rod 613, a hinged rod 614, a second push rod 615 and a range-extending assembly 7. One end of the first push rod 611 is fixedly connected with the straight rack 56. The other end of the first push rod 611 is hingedly connected with one end of the connecting rod 613. The other end of the connecting rod 613 is hingedly connected with one end of the second push rod 615. One end of the hinged rod 614 is hingedly connected with the L-shaped limiting cavity 612, and the hinged rod 614 is located at the right angle position of the L-shaped limiting cavity 612. The other end of the hinged rod 614 is hingedly connected with the middle part of the connecting rod 613. The other end of the second push rod 615 is fixedly connected with the range-extending assembly 7.

[0058] In this embodiment, preferably, according to the Figure 5 When the straight rack 56 moves downward, the first push rod 611 is driven to move downward, and the first push rod 611 drives the one end of the connecting rod 613 to move downward. Since the other end of the connecting rod 613 is hingedly connected with the second push rod 615, and the middle part of the connecting rod 613 is hingedly connected with the hinged rod 614, during the movement of the one end of the connecting rod 613, the other end of the connecting rod 613 will move horizontally to the left in the L-shaped limiting cavity 612 due to the limitation of the hinged rod 614 and the L-shaped limiting cavity 612, thereby driving the second push rod 615 to move to the left. The second push rod 615 drives the range-extending assembly 7 to move to the left. According to the principle of the lever, the blowing pipe 64 is driven to move to the right. Since the straight rack 56 moves up and down, when the straight rack 56 moves upward, the first push rod 611 is driven to move upward, and the first push rod 611 drives the one end of the connecting rod 613 to move upward, thereby driving the other end of the connecting rod 613 to move to the right and the second push rod 615 to move to the right. According to the principle of the lever, the blowing pipe 64 is driven to move to the left. The blowing pipe 64 moves back and forth and sprays high-pressure airflow, thereby fully cleaning the gaps and surfaces of the catalyst module 4.

[0059] Referring to Figure 3 The range-extending assembly 7 comprises a hinged piece 71, a first connecting rod 72, a second connecting rod 73, a first sliding block 74, a sliding groove 75 and a base plate 76. The second push rod 615 is fixedly connected with the hinged piece 71. The first connecting rod 72 is provided with a sliding groove 721 at one end. The hinged piece 71 is slidably hingedly connected in the sliding groove 721 of the first connecting rod 72. The other end of the first connecting rod 72 is hingedly connected with one end of the second connecting rod 73. The other end of the second connecting rod 73 is rotatably connected with the first sliding block 74. The first sliding block 74 is slidably connected with the sliding groove 75. The sliding groove 75 is fixedly connected with the base plate 76. The base plate 76 is fixedly connected with the inner wall of the reactor shell 1.

[0060] The second push rod 615 pushes the articulated piece 71 to the left, and the articulated piece 71 moves to the left, and the articulated end thereof slides in the sliding groove 721 during the movement to the left, and drives the first connecting rod 72 to rotate on the base plate 76, and pushes the second connecting rod 73 to move to the right according to the principle of lever, and the second connecting rod 73 pushes the first sliding block 74 to move to the right, and drives the blowing pipe 64 to move to the right.

[0061] With reference to Figure 3 and Figure 8 The pull ring 54 is provided with a second sliding groove 531 matched with the second sliding block 53, and the sliding rail 57 is provided with a first sliding groove 551 matched with the straight rack 55.

[0062] The second sliding block 53 reciprocates in the pull ring 54 to drive the straight rack 55 to reciprocate up and down.

[0063] With reference to Figures 1-8 The arc-shaped branch pipes 32 are centrally symmetrically distributed at two ends of the four-way pipe 33, and the inclined surface of the arc-shaped branch pipe 32 is provided with the first gas hole 34.

[0064] The first gas hole 34 generates airflow to push the arc-shaped branch pipe 32 to do circular motion, thereby enhancing the disturbance to the gas and the mixing effect of the gas.

[0065] With reference to Figure 2 and Figure 6 The L-shaped limiting cavity 612 is provided with a through hole at the right angle, and the blowing pipe 64 is provided with a plurality of second gas holes 641. The L-shaped limiting cavity 612 is provided with a through hole at the right angle because a part of the connecting rod 613 and the articulated rod 614 is located outside the L-shaped limiting cavity 612, so that when the first push rod 611 pushes one end of the connecting rod 613 to move, the other end of the connecting rod 613 can drive the second push rod 615 to move horizontally.

[0066] According to the principle of liquid pressure, the movement of the connecting rod 613 can drive the articulated rod 614 to move, and the second gas hole 641 generates high-pressure airflow to wash the dust.

[0067] Working principle: in use, flue gas enters through the duct 2, ammonia water enters the main ammonia spraying pipe 31, flows through the arc-shaped branch pipe 32, and then sprays water mist outward. According to Newton's third law, when the gas flows out from one end, it will exert a force on the circumference, pushing the circumference to rotate in the opposite direction of the gas. The combined force of the two forces will make the circumference rotate around the central axis. Since the gas flows out from both ends of the arc-shaped branch pipe 32, the gas exerts a force on the circumference, causing the arc-shaped branch pipe 32 to rotate. The rotation of the arc-shaped branch pipe 32 disturbs the airflow, and the grid support 36 forms a temporary barrier above the mixing area of ammonia gas and flue gas, forming a negative pressure area and improving the mixing effect of flue gas and ammonia water. The potential energy generated by the rotation of the arc-shaped branch pipe 32 is stored in the power generation assembly 35, and the accumulated energy of the power generation assembly 35 can drive the turnover member 5 to operate;

[0068] After the flue gas and water mist ammonia water are preliminarily reacted, they enter the catalyst module 4, which accelerates the reduction of flue gas by ammonia water. Due to long-term use, the catalyst module 4 is prone to dust accumulation and blockage. Start the motor 51, the motor 51 drives the rocker 52 to rotate, the rocker 52 drives the second sliding block 53 to slide on the pull ring 54, the pull ring 54 drives the straight rack 55 to move up and down repeatedly on the sliding rail 57, the straight rack 55 drives the gear 561 to rotate, the gear 561 drives the rotating shaft 562 to rotate, and the rotating shaft 562 drives the catalyst module 4 to rotate;

[0069] When the straight rack 56 moves downward, the first push rod 611 moves downward, the first push rod 611 drives the one end of the connecting rod 613 to move downward, and since the other end of the connecting rod 613 is hinged with the second push rod 615 and the middle part of the connecting rod 613 is hinged with the hinge rod 614, during the movement of the one end of the connecting rod 613, the other end of the connecting rod 613 will move horizontally to the left in the L-shaped limiting cavity 612 due to the limitation of the hinge rod 614 and the L-shaped limiting cavity 612, thereby driving the second push rod 615 to move to the left. According to the principle of leverage, the second push rod 615 drives the range increasing assembly 7 to move to the left, thereby driving the blowing pipe 64 to move to the right.

[0070] Since the straight rack 56 moves up and down repeatedly, when the straight rack 56 moves upward, the first push rod 611 moves upward, the first push rod 611 drives the one end of the connecting rod 613 to move upward, thereby driving the other end of the connecting rod 613 to move to the right and the second push rod 615 to move to the right. According to the principle of leverage, the second push rod 615 drives the second push rod 615 to move to the right, thereby driving the blowing pipe 64 to move to the left. The blowing pipe 64 moves back and forth and left and right, and sprays high-pressure airflow. At this time, the catalyst module 4 is in multi-station turnover motion, which can fully clean the gaps and surfaces of the front and back of the catalyst module 4, which is convenient, fast and efficient.

[0071] Finally, it should be noted that the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the embodiments are described in detail with reference to the present application, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, but any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An ammonia injection device for SCR denitration, characterized in that: The application relates to a reactor, which comprises a reactor shell (1), a wind pipe (2), an ammonia spraying member (3), a catalyst module (4), a turnover member (5) and a gas valve cleaning member (6). The wind pipe (2) is connected with the reactor shell (1), the reactor shell (1) is internally provided with the catalyst module (4), and the wind pipe (2) is internally provided with the ammonia spraying member (3). The catalyst module (4) is used for accelerating the reaction rate of materials. The turnover member (5) is used for adjusting the angle of the catalyst module (4). The gas valve cleaning member (6) is used for cleaning the catalyst module (4).

2. The ammonia injection device for SCR denitration according to claim 1, characterized in that: The ammonia spraying member (3) comprises an ammonia spraying main pipe (31), an arc-shaped branch pipe (32), a four-way pipe (33), a power generation assembly (35) and a grid support (36), the ammonia spraying main pipe (31) is connected with the arc-shaped branch pipe (32), the four-way pipe (33) is connected with the ammonia spraying main pipe (31) and the arc-shaped branch pipe (32), the ammonia spraying main pipe (31) is fixedly connected with the power generation assembly (35), the power generation assembly (35) is fixedly connected with the grid support (36), and the grid support (36) is fixedly connected with the inner wall of the wind pipe (2).

3. The ammonia injection device for SCR denitration according to claim 2, characterized in that: The turnover member (5) comprises a motor (51), a rocker (52), a second sliding block (53), a pull ring (54), a straight rack (55), a turnover assembly (56) and a sliding rail (57), the power generation assembly (35) is electrically connected with the motor (51), the output shaft of the motor (51) is rotationally connected with the rocker (52), the rocker (52) is fixedly connected with the second sliding block (53), the second sliding block (53) is slidably connected with the pull ring (54), the pull ring (54) is fixedly connected with the straight rack (55), and the straight rack (55) is slidably connected with the sliding rail (57).

4. The ammonia injection device for SCR denitration according to claim 3, characterized in that: The turnover assembly (56) comprises three groups, the turnover assembly (56) comprises a gear (561), a rotating shaft (562) and a support frame (563), the gear (561) is meshingly connected with the straight rack (55), the gear (561) is fixedly connected with the rotating shaft (562), the rotating shaft (562) is fixedly connected with the support frame (563), and the support frame (563) is fixedly connected with the catalyst module (4).

5. The ammonia injection device for SCR denitration according to claim 1, characterized in that: The gas valve cleaning member (6) comprises a moving module (61), a fixed disc (62), a pulse blowing assembly (63), a blowing pipe (64), a third sliding block (65) and a sealing plate (66), the moving module (61) is fixedly connected with the blowing pipe (64), the blowing pipe (64) is fixedly connected with the third sliding block (65), the third sliding block (65) is slidably connected with the sealing plate (66), and the sealing plate (66) is fixedly connected with the inner wall of the reactor shell (1).

6. The ammonia injection device for SCR denitration according to claim 5, characterized in that: The mobile module (61) comprises a first push rod (611), an L-shaped limiting cavity (612), a connecting rod (613), a hinged rod (614), a second push rod (615) and a range increasing assembly (7), one end of the first push rod (611) is fixedly connected with a straight rack (56), the other end of the first push rod (611) is hinged with one end of the connecting rod (613), the other end of the connecting rod (613) is hinged with one end of the second push rod (615), one end of the hinged rod (614) is hinged on the L-shaped limiting cavity (612), and the hinged rod (614) is located at the right angle position of the L-shaped limiting cavity (612), the other end of the hinged rod (614) is hinged in the middle of the connecting rod (613), and the other end of the second push rod (615) is fixedly connected with the range increasing assembly (7).

7. The ammonia injection device for SCR denitration according to claim 6, characterized in that: The range increasing assembly (7) comprises a hinge (71), a first connecting rod (72), a second connecting rod (73), a first sliding block (74), a sliding groove (75) and a base plate (76), the second push rod (615) is fixedly connected with the hinge (71), one end of the first connecting rod (72) is provided with a sliding groove (721), the hinge (71) is slidingly hinged in the sliding groove (721) on the first connecting rod (72), the other end of the first connecting rod (72) is hinged with one end of the second connecting rod (73), the other end of the second connecting rod (73) is rotatably connected with the first sliding block (74), the first sliding block (74) is slidingly connected with the sliding groove (75), the sliding groove (75) is fixedly connected with the base plate (76), and the base plate (76) is fixedly connected with the inner wall of the reactor shell (1).

8. The ammonia injection device for SCR denitration according to claim 3, characterized in that: The pull ring (54) is provided with a second sliding groove (531) matched with the second sliding block (53), and the sliding rail (57) is provided with a first sliding groove (551) matched with the straight rack (55).

9. The ammonia injection device for SCR denitration according to claim 2, characterized in that: The arc-shaped branch pipes (32) are centrally symmetrically distributed at two ends of the four-way pipe (33), and the inclined surfaces of the arc-shaped branch pipes (32) are provided with first air holes (34).

10. The ammonia injection device for SCR denitration according to claim 6, characterized in that: The L-shaped limiting cavity (612) is provided with a through hole at the right angle, and the blowing pipe (64) is provided with a plurality of second air holes (641).

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