SCR (Selective Catalytic Reduction) denitration device based on flow field transformation

Abstract

The invention discloses an SCR denitration device based on flow field transformation, and belongs to the field of denitration devices.The SCR denitration device comprises an air inlet port, an air blower, a smoke exhaust pipe fitting, an air supply pipe fitting and an induced draft fan, the air inlet port is formed in one side of a first-stage flow dividing box body, the air blower is arranged on one side of the first-stage flow dividing box body, the air supply pipe fitting is connected to the output end of the air blower, and the induced draft fan is connected to the smoke exhaust pipe fitting; a smoke discharging pipe fitting is arranged on one side of the air feeding pipe fitting, a flow dividing mechanism is arranged over the smoke discharging pipe fitting, and the flow dividing mechanism reasonably distributes the total flow of entering smoke, so that flow balance is achieved; a desulfurization mechanism is also integrated in the shunting mechanism, and the desulfurization mechanism adsorbs part of pollutants in the flue gas in advance through a built-in zeolite filter plate. According to the invention, the total flow of entering flue gas is reasonably distributed and homogenized through the shunting mechanism, so that when the flue gas enters a subsequent reaction area, the flow velocity of the flue gas in each channel or area is kept balanced.

Description

Technical Field

[0001] This invention belongs to the field of denitrification devices, specifically relating to an SCR denitrification device based on flow field modification. Background Technology

[0002] Flow field technology is one of the key technologies in SCR denitrification process. A uniform and robust flow field creates the necessary conditions for NOx and reducing agent to undergo redox reaction on the catalyst surface. The purpose of CFD simulation and model test of denitrification flow field is to obtain the optimal design of flue gas flow distribution devices such as flue, guide plate, ammonia injection system, and rectifier grid, so as to achieve better flue gas flow distribution and keep the resistance of denitrification system to a minimum.

[0003] When pulverized coal is burned in a boiler, a large amount of NOx is easily generated in the center of the flame or in areas with excessively high local oxygen concentration (such as near the burner). Due to the uneven distribution of airflow, fuel injection angle and pulverized coal concentration in the furnace, the location and intensity of these high-temperature / oxygen-rich zones will change dynamically, resulting in spatial heterogeneity of NOx generation. Traditional SCR reactors are usually designed based on the simplified assumption of uniform inlet NOx concentration, and the ammonia injection grid distributes the reducing agent according to the average concentration. However, the actual inlet NOx concentration may vary by several times in different height and width directions. The uneven flow field will lead to excessively high or low local flue gas velocity, further deteriorating the denitrification performance. Based on the above reasons, this invention designs an SCR denitrification device based on flow field modification. Summary of the Invention

[0004] The purpose of this invention is to provide an SCR denitrification device based on flow field modification.

[0005] A flow field modification-based SCR denitrification device is characterized by comprising an air inlet port, a blower, a flue gas exhaust pipe, an air supply pipe, and an induced draft fan. The air inlet port is located on one side of a primary distribution box. A blower is located on one side of the primary distribution box, and the output end of the blower is connected to an air supply pipe. A flue gas exhaust pipe is located on one side of the air supply pipe, and a flow distribution mechanism is located directly above the flue gas exhaust pipe. This flow distribution mechanism rationally distributes the total flow rate of the incoming flue gas to achieve flow balance, thereby reducing localized wear on the catalyst surface caused by uneven flue gas flow velocity. The flow distribution mechanism includes... The unit also integrates a desulfurization mechanism, which first adsorbs some pollutants in the flue gas through a built-in zeolite filter plate, and then further desulfurizes the flue gas by spraying chemical solution. A rectangular air duct is bolted to the top of the primary diversion box, and a one-way valve is installed directly below the diversion mechanism. The one-way valve is installed at the top of the air supply pipe, and the tail end of the exhaust pipe is connected to the output end of the induced draft fan. The interior of the primary diversion box is equipped with a flow-blocking mechanism, which uses multiple sets of plate filter elements to reduce the speed of the injected flue gas to avoid the flue gas velocity being too high and affecting the reaction effect.

[0006] Preferably, the desulfurization mechanism includes a waste liquid tray, a solenoid valve, a storage tank, spray holes, a liquid delivery pipe, and spiral blades. The waste liquid tray is located inside the secondary diversion box. A storage tank is located at the top of the waste liquid tray. A liquid delivery pipe is connected through the top of the storage tank. Multiple spray holes are opened around the outer side of the liquid delivery pipe. Spiral blades are located inside the liquid delivery pipe. The top of the spiral blades is connected to a set of output terminals of a bidirectional servo motor. The output terminal of the solenoid valve is connected to the bottom of the waste liquid tray.

[0007] Preferably, the top end of the gas supply pipe is connected to the bottom end of the corresponding secondary diversion box through multiple one-way valves, and the bottom end of the secondary diversion box is connected to the top end of the exhaust pipe.

[0008] Preferably, the liquid storage tank is connected to the spray nozzle through an internal infusion fitting, wherein the length of the infusion fitting is greater than the height of the liquid storage tank.

[0009] Preferably, the diversion mechanism includes a secondary diversion box, an air inlet duct, exhaust fan blades, a partition plate, a zeolite filter plate, a bidirectional servo motor, and side protrusions. The secondary diversion box is evenly spaced at the bottom of the rectangular air duct. An air inlet duct is welded to the top of the secondary diversion box. An exhaust fan blade is installed inside the secondary diversion box. The bottom of the exhaust fan blade is connected to another set of outputs of the bidirectional servo motor. The partition plate is installed inside the secondary diversion box. The rectangularly distributed side protrusions inside the secondary diversion box are connected to both sides of the partition plate. A zeolite filter plate is connected through the outer side of the partition plate. A bidirectional servo motor is connected to the outer side of the partition plate.

[0010] Preferably, the top of the secondary distribution box is provided with an air intake pipe, which is connected to the bottom of the rectangular air duct; both the upper and lower end faces of the secondary distribution box adopt a truncated quadrangular structure.

[0011] Preferably, the flow obstruction mechanism includes a bearing shaft, a rotary adsorber, a plate filter element, a first clamp, a second clamp, a semi-threaded rod, and a nut. The bearing shaft is located inside the primary flow distribution box. The rotary adsorber is connected to the outer side of the bearing shaft. The first clamp is arranged in a ring around the outer side of the rotary adsorber. The semi-threaded rod is connected to the outer side of the first clamp. The nut is connected to the outer side of the semi-threaded rod. The second clamp is connected through the outer side of the semi-threaded rod. The plate filter element is attached to one side of the second clamp and is installed on one side of the second clamp, forming a ring around the periphery of the rotary adsorber.

[0012] Preferably, clamp one and clamp two can be disassembled and assembled via a semi-threaded rod and a nut. Clamp two cooperates with the semi-threaded rod to press one side of the plate filter element.

[0013] Preferably, the first clamp is connected to the second clamp via a semi-threaded rod symmetrically arranged on its outer side. The semi-threaded rod cooperates with a nut to clamp and fix the second clamp on its upper and lower sides.

[0014] The beneficial effects of this invention are as follows: 1. This invention rationally distributes and homogenizes the total flow rate of incoming flue gas through a diversion mechanism, ensuring that the flue gas flow rate remains balanced in each channel or region as it enters the subsequent reaction zone. This effectively avoids problems such as catalyst surface erosion, wear, local overheating, or incomplete reaction caused by excessively high local flue gas flow rates in traditional devices. It not only effectively solves problems such as local catalyst wear, low reaction efficiency, and ammonia escape caused by uneven flue gas flow rates in traditional SCR systems, but also achieves synergistic treatment of multiple pollutants in flue gas through a built-in desulfurization mechanism.

[0015] 2. The upper and lower ends of the secondary diversion box adopt a truncated quadrangular structure to guide the airflow smoothly, reduce the impact and turbulence when the airflow enters or leaves the box, optimize the airflow field distribution inside the box, and make the flue gas flow more evenly to the internal functional components. The diversion mechanism distributes the concentrated flue gas evenly into multiple independent channels through multiple secondary diversion boxes, and uses induced draft fan blades to actively induce airflow, partition plates and side protrusions to optimize the flow field, and zeolite filter plates for adsorption pretreatment.

[0016] 3. By setting up an annular arrangement of the plate filter elements and physical blocking effect, the flue gas velocity entering the subsequent reaction zone is significantly reduced, the flow is more uniform, and the distribution is more stable. This avoids the scouring and wear of the catalyst surface by high-speed airflow, extending the catalyst's service life. The plate filter elements are arranged in an annular pattern around the rotary adsorber, forming a gradual and directional airflow channel. Clamps one and two, along with the semi-threaded rod and nut, constitute a clamping structure that can be quickly disassembled and assembled, improving equipment maintainability, reducing operation and maintenance costs, and making it suitable for long-term continuous operation scenarios. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the SCR denitrification device based on flow field modification according to the present invention. Figure 2 This is a schematic side view of the overall structure of the SCR denitrification device based on flow field modification according to the present invention. Figure 3 This is a front cross-sectional schematic diagram of the primary flow distribution box in the SCR denitrification device based on flow field modification of the present invention. Figure 4 This is a schematic diagram of the desulfurization mechanism in the SCR denitrification device based on flow field modification of the present invention; Figure 5 This is a top view of the secondary flow distribution box in the SCR denitrification device based on flow field modification of the present invention; Figure 6 This is a top view of the partition substrate structure in the SCR denitrification device based on flow field modification of the present invention; Figure 7 This is a schematic diagram of the flow splitting mechanism in the SCR denitrification device based on flow field modification of the present invention; Figure 8 This is a schematic diagram of the connection structure between clamp two and the semi-threaded rod in the SCR denitrification device based on flow field modification of the present invention.

[0018] The components include: 1. Air inlet port; 2. Primary distribution box; 3. Blower; 4. Exhaust pipe fittings; 5. Desulfurization mechanism; 51. Waste liquid tray; 52. Solenoid valve; 53. Storage tank; 54. Spray nozzle; 55. Liquid delivery pipe fittings; 56. Spiral blades; 6. Rectangular air duct; 7. Flow divider mechanism; 71. Secondary flow divider housing; 72. Intake duct; 73. Exhaust fan blades; 74. Separator plate; 75. Zeolite filter plate; 76. Bidirectional servo motor; 77. Side protrusion strip; 8. Air supply pipe fittings; 9. Check valve; 10. Exhaust fan; 11. Flow obstruction mechanism; 1101. Bearing shaft; 1102. Rotary wheel adsorber; 1103. Plate filter element; 1104. Fixture one; 1105. Fixture two; 1106. Semi-threaded rod; 1107. Nut. Detailed Implementation

[0019] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] like Figures 1 to 8 As shown, the SCR denitrification device based on flow field modification provided in this application includes an air inlet port 1, a blower 3, a flue gas pipe 4, an air supply pipe 8, and an induced draft fan 10. The air inlet port 1 is located on one side of the first-stage diversion box 2. The blower 3 is located on one side of the first-stage diversion box 2. The output end of the blower 3 is connected to the air supply pipe 8. The flue gas pipe 4 is located on one side of the air supply pipe 8. A diversion mechanism 7 is located directly above the flue gas pipe 4. A desulfurization mechanism 5 is also integrated inside the diversion mechanism 7.

[0026] A rectangular air duct 6 is bolted to the top of the primary diversion box 2. A one-way valve 9 is installed directly below the diversion mechanism 7. The one-way valve 9 is installed at the top of the air supply pipe 8. The tail end of the exhaust pipe 4 is connected to the output end of the induced draft fan 10. The interior of the primary diversion box 2 is equipped with a flow-blocking mechanism 11. The flow-blocking mechanism 11 uses multiple sets of plate filter elements 1103 to reduce the speed of the injected flue gas, so as to avoid the flue gas flow rate being too high and affecting the reaction effect.

[0027] The diversion mechanism 7 rationally distributes the total flow of incoming flue gas to achieve flow balance, thereby reducing local wear on the catalyst surface caused by uneven flue gas flow rate; the desulfurization mechanism 5 first adsorbs some pollutants in the flue gas through the built-in zeolite filter plate 75, and then further desulfurizes the flue gas by spraying chemical solution.

[0028] In some embodiments, the desulfurization mechanism 5 includes a waste liquid tray 51, a solenoid valve 52, a storage tank 53, spray holes 54, a liquid delivery pipe 55, and a spiral blade 56. The waste liquid tray 51 is disposed inside the secondary diversion box 71. A storage tank 53 is disposed at the top of the waste liquid tray 51. A liquid delivery pipe 55 is connected through the top of the storage tank 53. Multiple spray holes 54 are opened around the outer side of the liquid delivery pipe 55. A spiral blade 56 is disposed inside the liquid delivery pipe 55. The top of the rotary blade 56 is connected to a set of output terminals of the bidirectional servo motor 76, and the output terminal of the solenoid valve 52 is connected to the bottom of the waste liquid tray 51. The top of the air supply pipe 8 is connected to the bottom of the corresponding secondary diversion box 71 through multiple one-way valves 9, and the bottom of the secondary diversion box 71 is connected to the top of the exhaust pipe 4. The liquid storage tank 53 is connected to the spray hole 54 through the liquid delivery pipe 55 installed inside it, wherein the length of the liquid delivery pipe 55 is greater than the height of the liquid storage tank 53.

[0029] The diversion mechanism 7 rationally distributes and homogenizes the total flow rate of the incoming flue gas, so that the flue gas flow rate in each channel or area remains balanced when the flue gas enters the subsequent reaction area. The plate filter element 1103 is arranged in a ring around the rotary adsorber 1102. It is essentially a group of neatly arranged filter plates. They form tortuous, narrow and orderly airflow channels to avoid high-speed airflow directly impacting the downstream catalyst and protect it from erosion and wear.

[0030] In some embodiments, the diversion mechanism 7 includes a secondary diversion box 71, an air inlet pipe 72, an exhaust fan blade 73, a partition plate 74, a zeolite filter plate 75, a bidirectional servo motor 76, and side protrusions 77. The secondary diversion box 71 is evenly spaced at the bottom end of the rectangular air duct 6. The air inlet pipe 72 is welded to the top end of the secondary diversion box 71. The exhaust fan blade 73 is disposed inside the secondary diversion box 71. The bottom end of the exhaust fan blade 73 is connected to another set of output ends of the bidirectional servo motor 76. The partition plate 74 is installed inside the secondary diversion box 71. The rectangularly distributed side protrusions 77 inside the secondary diversion box 71 are connected to both sides of the partition plate 74. The zeolite filter plate 75 is connected through the outer side of the partition plate 74. The bidirectional servo motor 76 is connected to the outer side of the partition plate 74. The air inlet pipe 72 is disposed at the top end of the secondary diversion box 71 and is connected to the bottom end of the rectangular air duct 6. The upper and lower end faces of the secondary diversion box 71 are both of a truncated pyramid structure.

[0031] Before entering the main denitrification reaction zone, the flue gas undergoes dual treatment of adsorption by zeolite filter plate 75 and desulfurization by chemical spraying. Multiple spray holes 54 are provided on the liquid delivery pipe 55 in the desulfurization mechanism 5. With the rotation of the internal spiral blades 56, the desulfurizing agent can be sprayed evenly, fully atomized, and fully contacted with the flue gas. In some embodiments, the flow-blocking mechanism 11 includes a bearing shaft 1101, a rotary suction device 1102, a plate filter element 1103, a first clamp 1104, a second clamp 1105, a semi-threaded rod 1106, and a nut 1107. The bearing shaft 1101 is disposed inside the primary flow distribution box 2. The rotary suction device 1102 is connected to the outer side of the bearing shaft 1101. The first clamp 1104 is arranged in a ring around the outer side of the rotary suction device 1102. The semi-threaded rod 1106 is connected to the outer side of the first clamp 1104. The nut 1107 is connected to the outer side of the semi-threaded rod 1106. The second clamp 1105 is connected through the outer side of the semi-threaded rod 1106. One side of clamp 1105 is attached to a plate filter element 1103. The plate filter element 1103 is installed on one side of clamp 1105 and surrounds the outer periphery of the rotary adsorber 1102 in a ring. Clamp 1104 and clamp 2105 can be disassembled and assembled through semi-threaded rod 1106 and nut 1107. Clamp 2105 cooperates with semi-threaded rod 1106 to press one side of plate filter element 1103. Clamp 1104 is connected to clamp 2105 through semi-threaded rod 1106 symmetrically arranged on its outer side. Semi-threaded rod 1106 cooperates with nut 1107 to clamp and fix clamp 2105 on its upper and lower sides.

[0032] The plate filter element 1103 is fixed by clamp two 1105. Clamp two 1105 is connected to clamp one 1104 by multiple semi-threaded rods 1106 and then locked by nuts 1107. The rotary adsorber 1102 supported by the bearing shaft 1101 performs preliminary adsorption and contact optimization of the flue gas. Then, the annularly arranged plate filter element 1103 physically slows down and rectifies the flue gas, so that the flue gas velocity entering the subsequent reaction zone is reduced, the flow is uniform, and the distribution is stable, thereby protecting the catalyst, improving the reaction efficiency, and reducing system wear and energy consumption. At the same time, the plate filter element 1103 is firmly positioned and easily disassembled by clamp two 1105 and clamp one 1104, ensuring long-term stable operation and convenient maintenance of the equipment.

[0033] In operation, the operator first connects the air inlet port 1 on the side of the primary diversion box 2 to the flue gas pipe, and then injects the flue gas into the interior of the diversion box 2. The injected flue gas is adsorbed and purified by the rotary adsorber 1102 and plate filter element 1103 installed inside the primary diversion box 2. The flue gas first passes through the rotary adsorber 1102, which is mounted on the outside of the bearing shaft 1101 and may be a fixed or rotatable structure. If it is a rotatable design, the rotary wheel can be passively rotated under the push of the flue gas. The plate filter element 1103 is arranged in a ring around the rotary adsorber 1102. It is essentially a set of neatly arranged guide plates or plate filter elements 1103. They form tortuous, narrow, and orderly airflow channels. The plate filter element 1103 is fixed by clamp two 1105. Clamp two 1105 is connected to clamp one 1104 by multiple semi-threaded rods 1106 and then locked by nuts 1107. Clamp two 1105 and clamp one 1104 are symmetrically arranged by semi-threaded rods 1106 and clamped on the upper and lower sides. Subsequently, multiple secondary diversion boxes 71, evenly spaced at the bottom of the rectangular duct 6, divert the airflow. Each secondary diversion box 71 has an air inlet pipe 72 welded to its top, which connects to the bottom of the rectangular duct 6 to introduce flue gas into the secondary diversion box 71. Each secondary diversion box 71 is equipped with an exhaust fan blade 73, which is driven to rotate by another set of outputs of a bidirectional servo motor 76. The upper and lower end faces of the secondary diversion box 71 are both made of a truncated pyramid structure to guide the airflow to a smooth transition and reduce the impact and turbulence when the airflow enters or leaves the box. The two sides of the partition substrate 74 are connected to the rectangularly distributed side protrusions 77. The outer side of the partition substrate 74 is connected to the zeolite filter plate 75. The diversion mechanism 7 distributes the concentrated flue gas evenly into multiple independent channels through multiple secondary diversion boxes 71. The fan blades 73 actively induce airflow, the partition substrate 74 and the side protrusions 77 optimize the flow field, and the zeolite filter plate 75 performs adsorption pretreatment. After passing through the exhaust pipe 4 set at the bottom, the operator uses the blower 3 to draw ozone into the inside of the gas supply pipe 8. Then, through multiple sets of one-way valves 9, ammonia is injected into the inside of the secondary diversion box 71. The ozone oxidizes the difficult-to-treat NO into NO2 or high-valence nitrogen oxides that are easily absorbed or adsorbed, which is convenient for subsequent wet absorption or adsorption removal. The infusion fitting 55 is internally equipped with a spiral blade 56, which is driven to rotate by a set of outputs of a bidirectional servo motor 76. The spiral blade 56 is integrated inside the infusion fitting 55 and is driven to rotate by a set of outputs of a bidirectional servo motor 76. The blade draws the liquid medicine from the storage tank 53 along the axial direction of the fitting through the axial pumping effect. Subsequently, the liquid medicine is atomized and sprayed out through the outer annular array of spray holes 54. The liquid medicine is directly sprayed into the flue gas through the outer annular array of spray holes 54. These spray holes 54 evenly spray the liquid medicine into the flowing flue gas in the form of mist or droplets. The spray holes 54 are usually located close to the flue gas flow area so that the liquid medicine can fully contact SO2 in the flue gas and undergo a chemical reaction. The waste liquid after spraying contains reaction products such as sulfites, unreacted pharmaceutical solutions, and dust, which drip downwards and enter the waste liquid tray 51 below for collection. The solenoid valve 52 is connected to the bottom of the waste liquid tray 51 to control the discharge of waste liquid. The flue gas treated by the secondary diversion box 71 is secondary-converged to the exhaust pipe 4 through the rectangular opening structure at the bottom. Subsequently, the induced draft fan 10 configured on the side wall of the main exhaust pipe starts negative pressure suction to synchronously extract the purified flue gas from the multi-unit reaction zone from the system.

[0034] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. An SCR denitration device based on flow field modification, characterized in that: Including air inlet port (1), air blower (3), exhaust pipe (4), air pipe (8) and induced draft fan (10), the air inlet port (1) is arranged on one side of the primary flow distribution box (2), the primary flow distribution box (2) is provided with air blower (3) on one side, the output end of the air blower (3) is connected with air pipe (8), one side of the air pipe (8) is provided with exhaust pipe (4), the top of the exhaust pipe (4) is provided with flow distribution mechanism (7), the flow distribution mechanism (7) distributes the total flow of the entering flue gas, realizes flow balance; The inside of the flow distribution mechanism (7) is also integrated with desulfurization mechanism (5), the desulfurization mechanism (5) first absorbs part of the pollutants in the flue gas through the built-in zeolite filter plate (75), and then desulfurizes the flue gas by spraying liquid medicine;The top end of the primary flow distribution box (2) is bolted with rectangular air pipe (6), the bottom of the flow distribution mechanism (7) is provided with one-way valve (9), the one-way valve (9) is installed at the top end of the air pipe (8), the tail end of the exhaust pipe (4) is connected with the output end of the induced draft fan (10), the inside of the primary flow distribution box (2) is provided with resistance mechanism (11), the resistance mechanism (11) reduces the speed of the injected flue gas through multiple groups of plate filter core (1103). 2.The SCR de-NOx device based on flow field modification according to claim 1, characterized in that, The desulfurization mechanism (5) includes waste liquid disc (51), electromagnetic valve (52), liquid storage tank (53), spray hole (54), liquid conveying pipe (55) and spiral blade (56), the waste liquid disc (51) is arranged in the inside of the secondary flow distribution box (71), the top end of the waste liquid disc (51) is provided with liquid storage tank (53), the top end of the liquid storage tank (53) is connected with liquid conveying pipe (55) penetratingly, a plurality of spray holes (54) are formed on the outer side of the liquid conveying pipe (55), the inside of the liquid conveying pipe (55) is provided with spiral blade (56), the top end of the spiral blade (56) is connected with one group of output end of the bidirectional servo motor (76), the bottom end of the waste liquid disc (51) is connected with the output end of the electromagnetic valve (52).

3. The SCR denitration device based on flow field reconstruction according to claim 2, characterized in that, The top end of the air pipe (8) is communicated with the bottom end of the corresponding secondary flow distribution box (71) through a plurality of one-way valves (9), and the bottom end of the secondary flow distribution box (71) is connected with the top end of the exhaust pipe (4).

4. The flow field modified based SCR denitration device according to claim 2, characterized in that, The liquid storage tank (53) is connected with the spray hole (54) through the liquid conveying pipe (55) arranged in the inside thereof, and the length of the liquid conveying pipe (55) is greater than the height of the liquid storage tank (53).

5. The flow field modified based SCR denitration device according to claim 1, characterized in that, The shunt mechanism (7) comprises a secondary shunt box (71), an air inlet pipe (72), a guide fan blade (73), a separation base plate (74), a zeolite filter plate (75), a bidirectional servo motor (76) and a side protrusion (77), the secondary shunt box (71) is arranged at the bottom end of the rectangular air pipe (6) at equal intervals, the top end of the secondary shunt box (71) is welded with the air inlet pipe (72), the inside of the secondary shunt box (71) is provided with the guide fan blade (73), the bottom end of the guide fan blade (73) is connected with the other group of output ends of the bidirectional servo motor (76), the separation base plate (74) is installed in the inside of the secondary shunt box (71), the side protrusions (77) distributed in the rectangular shape in the inside of the secondary shunt box (71) are connected with the two sides of the separation base plate (74), the outside of the separation base plate (74) is penetrated and connected with the zeolite filter plate (75), and the outside of the separation base plate (74) is connected with the bidirectional servo motor (76). 6.The SCR de-NOx device based on flow field modification according to claim 5, characterized in that, The top end of the secondary shunt box (71) is provided with the air inlet pipe (72), and the air inlet pipe (72) is communicated with the bottom end of the rectangular air pipe (6); the upper and lower end faces of the secondary shunt box (71) adopt four-prism table structures.

7. The flow field modified based SCR denitration device according to claim 6, characterized in that, The resistance mechanism (11) comprises a bearing shaft (1101), a runner adsorber (1102), a plate filter element (1103), a clamp one (1104), a clamp two (1105), a half threaded rod (1106) and a nut (1107), the bearing shaft (1101) is arranged in the inside of the primary shunt box (2), the outside of the bearing shaft (1101) is connected with the runner adsorber (1102), the outside of the runner adsorber (1102) is annularly provided with the clamp one (1104), the outside of the clamp one (1104) is connected with the half threaded rod (1106), the outside of the half threaded rod (1106) is connected with the nut (1107), the outside of the half threaded rod (1106) is penetrated and connected with the clamp two (1105), one side of the clamp two (1105) is attached with the plate filter element (1103), the plate filter element (1103) is arranged on one side of the clamp two (1105) and annularly surrounds the periphery of the runner adsorber (1102). 8.The SCR de-NOx device based on flow field modification according to claim 7, characterized in that, The clamp one (1104) and the clamp two (1105) can be disassembled through the half threaded rod (1106) and the nut (1107), the clamp two (1105) cooperates with the half threaded rod (1106) to press the one side of the plate filter element (1103) tightly. 9.The SCR de-NOx device based on flow field modification according to claim 8, characterized in that, The clamp one (1104) is connected with the clamp two (1105) through the half threaded rods (1106) symmetrically arranged on the outside of the clamp one (1104), and the half threaded rod (1106) cooperates with the nut (1107) to clamp and fix the clamp two (1105) on the upper and lower two sides.

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