Flue gas denitration device suitable for power plant

Abstract

The invention discloses a flue gas denitration device suitable for a power plant, belongs to the field of flue gas denitration, and aims to solve the problem that an existing flue gas denitration device is difficult to better remove impurities in flue gas, through a filter bag, a cushion block, a swing assembly and a vibration assembly, in the working process, when flue gas with certain power is blown to the outer surface of the filter bag, the impurities in the flue gas are removed through the filter bag, the cushion block, the swing assembly and the vibration assembly; when the flue gas flows into the filter bag, external force is applied to the filter bag, so that the filter bag moves, the filter bag drives the butt-joint block to move along the swinging groove, and the power of the introduced flue gas is not stable all the time, so that repulsive force is indirectly generated between the magnetic block B and the magnetic block A, and the butt-joint block and the filter bag swing back and forth along the swinging groove in a small range and generate vibration; therefore, impurities on the surface of the filter bag are shaken off, and reduction of the quality of smoke filtered by the filter bag due to blockage of the surface of the filter bag is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas denitration, and in particular to a flue gas denitration device suitable for power plants. Background Art

[0002] The flue gas of power plants contains a large amount of nitrogen oxides. When nitrogen dioxide reacts with water vapor in the atmosphere, nitric acid is formed. Nitric acid falls to the ground with precipitation, causing acid rain. Acid rain can cause serious damage to the ecosystem. For example, it can acidify the soil and destroy the soil structure. Many plants grow well in neutral or slightly acidic soils. When the soil becomes acidic, metal ions such as aluminum are released in large quantities, which are toxic to plant roots, affecting the plant's absorption of nutrients, leading to forest decline and crop yield reduction.

[0003] In a Chinese patent with application number CN202310902315.4, a flue gas denitrification mixing device is proposed, including a denitrification chamber, the outer wall of which is provided with an air intake assembly, the bottom inner wall of which is provided with a conveying assembly, and the top inner wall of which is provided with a guide assembly; under the action of guide plates one to four, the flue gas mixture will undergo two decelerations and two accelerations. During acceleration and deceleration, the flue gas and ammonia have different moving speeds under the action of inertia for more complete contact. During each deceleration, the ammonia sprayed from nozzle one on the annular tube through the action of the pump body will also fully contact with it to produce a reduction reaction. The flue gas will react more evenly with it during deceleration, and each acceleration and deceleration will flow in opposite directions under the action of guide plates one and two. The mixing effect of the flue gas and ammonia is further improved, thereby improving the mixing efficiency of the flue gas denitrification.

[0004] However, it is difficult to remove impurities in the flue gas during operation of the above device. The prior art uses a filter for pretreatment, which has low treatment quality and cannot clean the filter surface in time, which will cause the filter to be blocked. The quality of flue gas filtered by the blocked filter will decrease.

[0005] Therefore, a flue gas denitrification device suitable for power plants is proposed. Summary of the invention

[0006] The object of the present invention is to provide a flue gas denitration device suitable for a power plant, which solves the problem in the background technology that the current flue gas denitration device is difficult to better remove impurities in the flue gas.

[0007] To achieve the above object, the present invention provides the following technical solution: a flue gas denitration device suitable for a power plant, comprising an air intake box, a reaction box arranged at one end of the air intake box, an injection component for spraying ammonia gas is arranged on the outer surface of the air intake box, and a pretreatment component is arranged inside the air intake box; The pretreatment component includes a filter bag arranged inside the air intake box, pads arranged on both sides of the inner wall of the air intake box, and a swing assembly arranged on the upper end of the filter bag. Displacement blocks are arranged on both sides of the filter bag, and the filter bag is slidably connected with the pads through the displacement blocks. A swing groove is provided at the top of the inner wall of the air intake box. The swing assembly includes a docking block slidably arranged inside the swing groove, and a connecting rod penetrating the docking block. The lower end of the docking block is connected to the filter bag. A magnetic block A is provided at one end of the connecting rod, and a mounting block is provided at the other end of the connecting rod. A reset spring is provided on one side of the mounting block, and one end of the reset spring is connected to the inner wall of the swing groove. A magnetic block B is provided inside the swing groove, and the magnetic block B is opposite to the magnetic block A and magnetically repels each other.

[0008] Furthermore, both sides of the docking block are provided with a card slot, and a roller is rotatably arranged inside the card slot, and the outer surface of the roller contacts the inner wall of the swing groove.

[0009] Furthermore, a pneumatic telescopic rod is provided at the lower end of the docking block, and the pneumatic telescopic rod is located inside the filter bag, and a diagonal support rod is provided at the lower end of the pneumatic telescopic rod, and two groups of diagonal support rods are provided, and one end of the two groups of diagonal support rods is provided with rubber blocks, and the outer surfaces of the two groups of rubber blocks are in contact with both sides of the filter bag, and the contact surface between the rubber block and the filter bag is the smoke blowing surface, and one end of the pneumatic telescopic rod is connected to an extension hose, and one end of the extension hose is connected to the air pump A arranged at the upper end of the air inlet box.

[0010] Furthermore, a discharge assembly is also provided inside the air intake box, and a docking groove is provided at the bottom of the air intake box. The discharge assembly includes a blanking plate and an inclined plate arranged inside the docking groove, one side of the blanking plate is in contact with the inclined plate, and an electric push rod is provided on the other side of the blanking plate, one end of the electric push rod is connected to the lower bottom surface of the air intake box, and a collecting box is provided at the lower end of the air intake box, which is communicated with the docking groove.

[0011] Furthermore, the filter bags are provided in two groups, and the lower ends of the two groups of filter bags are respectively provided with air cushion blocks A and air cushion blocks B. The outer surfaces of the air cushion blocks A and air cushion blocks B are provided with one-way air outlet holes and one-way air inlet holes. In the initial state, the lower bottom surfaces of the air cushion blocks A and air cushion blocks B are in contact with the upper surface of the blanking plate.

[0012] Furthermore, a vibration assembly is also provided inside the air intake box, and the vibration assembly includes a toothed plate arranged at one end of the displacement block, a transmission rod rotatably arranged at the bottom of the air intake box, and a gear arranged on the outer surface of the transmission rod, the gear is meshed with the toothed plate, a groove is opened on one side of the inclined plate, a spring sheet is arranged inside the groove, and a paddle is also arranged on the outer surface of the transmission rod, and the paddle corresponds to the spring sheet.

[0013] Furthermore, the jet component includes an air storage box arranged on the upper surface of the air intake box, air ducts embedded in both sides of the air storage box, and an air pump B arranged on the outer surface of the air duct, one end of the air pump B is connected to the air duct, and the other end of the air pump B is provided with a switching tube, one end of the switching tube is connected to the air storage box, one side of the air duct is connected to a short tube, one end of the short tube is connected to a nozzle, and the short tube and the nozzle are both located inside the air intake box.

[0014] Furthermore, partitions are arranged inside the reaction box, and there are multiple groups of partitions, and the multiple groups of partitions are staggered.

[0015] Furthermore, a honeycomb catalyst is also arranged inside the end of the reaction box near the outlet, a connection port is opened on the lower bottom surface of the reaction box, an electric control door is arranged in the connection port, the connection port and the honeycomb catalyst are arranged in the same vertical plane, a processing part is arranged at the lower end of the reaction box, the processing part includes a processing box arranged at the lower end of the connection port, and a cleaning component arranged on the outer surface of the processing box, the cleaning component includes an air pump C arranged on one side of the processing box, docking hoses arranged at both ends of the air pump C, and an absorption cover arranged at one end of one group of the docking hoses, the absorption cover is located inside the processing box, an airbag cushion is arranged at the bottom of the processing box, and another group of the docking hoses is connected to the airbag cushion, a plastic ball is placed in the airbag cushion, an ash discharge pipe is arranged at the lower end of the airbag cushion, and one end of the ash discharge pipe passes through the inner wall of the processing box to connect with the outside world.

[0016] Furthermore, a controller is provided on the outer surface of the reaction box, and a main control module is provided inside the controller. The main control module is signal-connected to a nitrogen oxide analysis module, the nitrogen oxide analysis module is signal-connected to a flue gas pretreatment module, the flue gas pretreatment module is signal-connected to a reducing agent control module, the reducing agent control module is signal-connected to a temperature control module, and the temperature control module is signal-connected to an emission monitoring module. Denitration operation is performed through the main control module in the controller, the nitrogen oxide analysis module is signal-connected to a nitrogen oxide concentration detection unit arranged at the air inlet of the air inlet box, the nitrogen oxide content and type in the initial flue gas are analyzed, the concentration and proportion of each nitrogen oxide are calculated, the amount of reducing agent ammonia released is controlled according to the calculated data, the overall operation of the pretreatment component is controlled by the flue gas pretreatment module, the overall operation of the jet component is controlled by the reducing agent control module, the reaction temperature inside the reaction box is controlled within a suitable range by the temperature control module, the emission monitoring module is signal-connected to a nitrogen oxide concentration detection unit arranged at the air outlet of the reaction box, and finally the nitrogen oxide content in the treated flue gas at the air outlet of the reaction box is calculated by the emission monitoring module to determine whether it meets the standard.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a flue gas denitration device suitable for power plants. In the prior art, it is difficult for the flue gas denitration device to better remove impurities in the flue gas. However, the present invention uses filter bags, cushion blocks, swing components and vibration components. During operation, when flue gas with a certain power blows toward the outer surface of the filter bag, an external force is applied to the filter bag, thereby causing the filter bag to move, and then the filter bag drives the docking block to move along the swinging groove. Since the power of the introduced flue gas is not always stable, a repulsive force is indirectly generated between the magnetic block B and the magnetic block A, thereby causing the docking block and the filter bag to swing back and forth along the swinging groove with a small amplitude and generate vibration, thereby shaking off impurities on the surface of the filter bag, and preventing the filter bag surface from being blocked, resulting in a decrease in the quality of flue gas filtered by the filter bag. Secondly, when the filter bag starts to move, the displacement block will move with it. The movement of the displacement block will drive the tooth plate to move, thereby causing the gear to rotate, and then driving the paddle to rotate. The rotating paddle will hit the shrapnel, causing the shrapnel to vibrate, indirectly causing the inclined plate to vibrate, further achieving the removal of impurities on the surface of the inclined plate, making it easier for impurities on the inclined plate to move down to the discharge plate, and also easier for impurities on the discharge plate to fall into the collection box, thereby improving overall work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structural diagram of the flue gas denitration device applicable to power plants of the present invention is shown; Figure 2 The present invention is a schematic diagram of the air inlet box structure of the flue gas denitrification device applicable to power plants Figure 1 ; Figure 3 The present invention is a schematic diagram of the air inlet box structure of the flue gas denitrification device applicable to power plants Figure 2 ; Figure 4 The present invention is a schematic diagram of the structure of the jetting components of the flue gas denitration device applicable to power plants; Figure 5 The present invention is a schematic diagram of the structure of the pretreatment component of the flue gas denitrification device applicable to power plants Figure 1 ; Figure 6 The present invention is a schematic diagram of the structure of the pretreatment component of the flue gas denitrification device applicable to power plants Figure 2 ; Figure 7 This is a schematic diagram of the structure of a discharge assembly of a flue gas denitration device applicable to a power plant according to the present invention; Figure 8 This is a schematic diagram of the structure of a reaction box of a flue gas denitration device applicable to a power plant according to the present invention; Fig. 9 This is a schematic diagram of the structure of a treatment component of a flue gas denitration device applicable to a power plant according to the present invention; Fig.10 This is a schematic diagram of the structure of a cleaning component of a flue gas denitration device applicable to a power plant according to the present invention; Fig.11 The present invention is a flowchart of a controller for a flue gas denitration device applicable to a power plant; Fig.12 The present invention is a schematic diagram of the gas flow inside the reaction box of the flue gas denitration device applicable to power plants.

[0019] In the figure: 1. air inlet box; 11. docking slot; 12. air pump A; 2. reaction box; 21. partition; 22. honeycomb catalyst; 23. connection port; 3. support frame; 4. jet component; 41. air storage box; 42. external pipe; 43. transfer pipe; 44. air guide pipe; 45. air pump B; 46. short pipe; 47. nozzle; 5. pretreatment component; 51. filter bag; 52. cushion block; 53. displacement block; 54. swing assembly; 541. docking block; 5411. slot; 5412. roller; 542. connecting rod; 543. magnet A; 544. mounting block; 545. reset spring; 546. magnet B; 547. pneumatic telescopic rod; 548. diagonal support rod; 549. rubber Block; 55, vibration assembly; 551, tooth plate; 552, gear; 553, transmission rod; 554, paddle; 56, discharging assembly; 561, air cushion block A; 562, air cushion block B; 563, unloading plate; 564, tilting plate; 5641, shrapnel; 565, electric push rod; 566, collecting box; 6, processing part; 61, processing box; 62, cleaning assembly; 621, air pump C; 622, absorption cover; 623, airbag cushion; 624, ash discharge pipe; 625, docking hose; 7, controller; 71, main control module; 72, nitrogen oxide analysis module; 73, flue gas pretreatment module; 74, reductant control module; 75, temperature control module; 76, emission monitoring module. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1 In order to solve the technical problems of how to improve the quality of flue gas pretreatment, such as Figure 1-Figure 7 As shown, the following preferred technical solutions are provided: A flue gas denitration device suitable for a power plant comprises an air intake box 1, a reaction box 2 arranged at one end of the air intake box 1, an injection component 4 for spraying ammonia is arranged on the outer surface of the air intake box 1, a pretreatment component 5 is arranged inside the air intake box 1, the pretreatment component 5 comprises a filter bag 51 arranged inside the air intake box 1, cushion blocks 52 arranged on both sides of the inner wall of the air intake box 1, and a swing assembly 54 arranged at the upper end of the filter bag 51, displacement blocks 53 are arranged on both sides of the filter bag 51, the filter bag 51 is slidably connected to the cushion blocks 52 through the displacement blocks 53, a swing groove is provided at the top end of the inner wall of the air intake box 1, the swing assembly 54 comprises a docking block 541 slidably arranged inside the swing groove, and a connecting rod 542 penetrating inside the docking block 541, the lower end of the docking block 541 is connected to the filter bag 51, and a magnetic block A543 is arranged at one end of the connecting rod 542. A mounting block 544 is provided at the other end of the connecting rod 542, and a return spring 545 is provided on one side of the mounting block 544. One end of the return spring 545 is connected to the inner wall of the swing groove, and a magnetic block B546 is provided inside the swing groove. The magnetic block B546 and the magnetic block A543 are opposite and magnetically repel each other, and the smoke is transported to the air intake box 1. Since the smoke carries a certain power, when the smoke blows to the outer surface of the filter bag 51, an external force will be given to the filter bag 51, so that the filter bag 51 moves, and then the filter bag 51 will drive the docking block 541 to move along the swing groove. Since the power of the introduced smoke will not be always stable, a repulsive force will be indirectly generated between the magnetic block B546 and the magnetic block A543, so that the docking block 541 and the filter bag 51 swing back and forth along the swing groove and generate vibration. The lower ends of the air intake box 1 and the reaction box 2 are both installed with a support frame 3.

[0022] A slot 5411 is provided on both sides of the docking block 541, and a roller 5412 is rotatably arranged inside the slot 5411. The outer surface of the roller 5412 contacts the inner wall of the swing groove. When the docking block 541 moves in the swing groove, the roller 5412 rolls with the swing groove to reduce the friction between the docking block 541 and the swing groove.

[0023] A pneumatic telescopic rod 547 is provided at the lower end of the docking block 541, and the pneumatic telescopic rod 547 is located inside the filter bag 51, and a diagonal support rod 548 is provided at the lower end of the pneumatic telescopic rod 547, and two groups of diagonal support rods 548 are provided, and one end of the two groups of diagonal support rods 548 is provided with a rubber block 549, the outer surfaces of the two groups of rubber blocks 549 are in contact with the two sides of the filter bag 51, and the contact surface between the rubber block 549 and the filter bag 51 is the smoke blowing surface, one end of the pneumatic telescopic rod 547 is connected to an extension hose, and one end of the extension hose is connected to the air pump A12 arranged at the upper end of the air inlet box 1, when there are more impurities in the smoke remaining on the surface of the filter bag 51, the air pump A12 is started, so that the pneumatic telescopic rod 547 is extended, and then the diagonal support rod 548 is moved downward along the inner wall of the filter bag 51, so that the filter bag 51 is stretched, thereby removing the impurities attached to the surface of the filter bag 51.

[0024] A discharge assembly 56 is also provided inside the air intake box 1. A docking groove 11 is provided at the bottom of the air intake box 1. The discharge assembly 56 includes a discharge plate 563 and an inclined plate 564 arranged inside the docking groove 11. One side of the discharge plate 563 is in contact with the inclined plate 564. An electric push rod 565 is provided on the other side of the discharge plate 563. One end of the electric push rod 565 is connected to the lower bottom surface of the air intake box 1. A collecting box 566 is provided at the lower end of the air intake box 1. The collecting box 566 is connected to the docking groove 11. Impurities removed from the surface of the filter bag 51 will fall onto the discharge plate 563. The electric push rod 565 is started to open the discharge plate 563, and the collecting box 566 is connected to the air intake box 1, so that the impurities will fall into the collecting box 566.

[0025] There are two groups of filter bags 51, and the lower ends of the two groups of filter bags 51 are respectively provided with air cushion blocks A561 and air cushion blocks B562. The outer surfaces of the air cushion blocks A561 and B562 are provided with one-way air outlets and one-way air inlet holes. In the initial state, the lower bottom surfaces of the air cushion blocks A561 and B562 are in contact with the upper surface of the unloading plate 563. When the filter bag 51 starts to move, the air cushion blocks A561 and B562 will move obliquely upward along the inclined plate 564, so that the air cushion blocks A561 and B562 squeeze the inclined plate 564, and the gas in the air cushion blocks A561 and B562 will be ejected from the one-way air outlet, thereby realizing the air blowing and removal of impurities remaining on the upper surfaces of the unloading plate 563 and the inclined plate 564.

[0026] A vibration assembly 55 is also provided inside the air intake box 1. The vibration assembly 55 includes a tooth plate 551 arranged at one end of the displacement block 53, a transmission rod 553 rotatably arranged at the bottom of the air intake box 1, and a gear 552 arranged on the outer surface of the transmission rod 553. The gear 552 is meshed with the tooth plate 551. A groove is provided on one side of the inclined plate 564. A spring piece 5641 is provided inside the groove. A paddle 554 is also provided on the outer surface of the transmission rod 553. The paddle 554 corresponds to the spring piece 5641. When the filter bag 51 starts to move, the displacement block 53 will also move accordingly. The movement of the displacement block 53 will drive the tooth plate 551 to move, thereby causing the gear 552 to rotate, and then driving the paddle 554 to rotate. The rotating paddle 554 will knock on the spring piece 5641, thereby causing the spring piece 5641 to vibrate, indirectly causing the inclined plate 564 to vibrate, and further completing the removal of impurities on the surface of the inclined plate 564.

[0027] The jet component 4 includes an air storage box 41 arranged on the upper surface of the air intake box 1, air guide pipes 44 embedded on both sides of the air storage box 41, and an air pump B45 arranged on the outer surface of the air guide pipe 44, one end of the air pump B45 is connected to the air guide pipe 44, and the other end of the air pump B45 is provided with a switching pipe 43, one end of the switching pipe 43 is connected to the air storage box 41, one side of the air guide pipe 44 is connected to a short pipe 46, one end of the short pipe 46 is connected to a nozzle 47, and the short pipe 46 and the nozzle 47 are both located inside the air intake box 1. The flue gas pretreated by the filter bag 51 continues to move along the air intake box 1, and the external pipe 42 arranged on the outer surface of the air storage box 41 is connected to the external ammonia, and the ammonia enters the air storage box 41 through the external pipe 42. When the air pump B45 is turned on, the ammonia will be sprayed out from the nozzle 47, and the sprayed ammonia will react with the nitrogen oxides in the flue gas to generate nitrogen and water.

[0028] Specifically, during the working process, when the flue gas with a certain power blows toward the outer surface of the filter bag 51, an external force will be applied to the filter bag 51, so that the filter bag 51 moves, and then the filter bag 51 drives the docking block 541 to move along the swing groove. Since the power of the incoming flue gas is not always stable, the magnetic block B546 and the magnetic block A543 will indirectly generate a repulsive force, so that the docking block 541 and the filter bag 51 will swing back and forth along the swing groove with a small amplitude and generate vibration, so as to shake off the impurities on the surface of the filter bag 51, and prevent the surface of the filter bag 51 from being blocked, which will cause the quality of the flue gas filtered by the filter bag 51 to decrease. Secondly, when the filter bag 51 starts to move, the displacement block 53 will also move accordingly. The movement of the displacement block 53 will drive the tooth plate 551 to move, thereby causing the gear 552 to rotate, and then driving the paddle 554 to rotate. The rotating paddle 554 will hit the spring piece 5641, thereby causing the spring piece 5641 to vibrate, indirectly causing the inclined plate 564 to vibrate, further achieving the removal of impurities on the surface of the inclined plate 564, making it easier for the impurities on the inclined plate 564 to move downward to the discharge plate 563, and also easier for the impurities on the discharge plate 563 to fall into the collection box 566, thereby improving the overall work efficiency.

[0029] In order to solve the technical problem of how to further improve the quality of denitrification, such as Figure 8-Figure 12 As shown, the following preferred technical solutions are provided: The reaction box 2 is provided with partitions 21 in multiple groups. The multiple groups of partitions 21 are staggered. The flue gas and ammonia gas are mixed and enter the reaction box 2 together, and flow along the gaps between the staggered partitions 21 to fully mix and react.

[0030] A honeycomb catalyst 22 is also arranged inside the end of the reaction box 2 near the outlet, a connection port 23 is opened on the lower bottom surface of the reaction box 2, an electric control door is arranged in the connection port 23, the connection port 23 and the honeycomb catalyst 22 are arranged in the same vertical plane, a processing part 6 is arranged at the lower end of the reaction box 2, the processing part 6 includes a processing box 61 arranged at the lower end of the connection port 23, and a cleaning component 62 arranged on the outer surface of the processing box 61, the cleaning component 62 includes an air pump C621 arranged on one side of the processing box 61, a docking hose 625 arranged at both ends of the air pump C621, and an absorption cover 622 arranged at one end of one group of the docking hoses 625, the absorption cover 622 is located inside the processing box 61, an airbag cushion 623 is arranged at the bottom of the processing box 61, and another group of the docking hoses 625 are connected to the airbag cushion 623, and the air Plastic balls are placed in the airbag cushion 623, and an ash discharge pipe 624 is provided at the lower end of the airbag cushion 623. One end of the ash discharge pipe 624 passes through the inner wall of the processing box 61 and is connected to the outside. When there are many impurities on the surface of the honeycomb catalyst 22, the electric control door is opened to allow the honeycomb catalyst 22 to enter the processing box 61, and then the air pump C621 is started. The suction force generated by it can suck the impurities on the surface of the honeycomb catalyst 22 into the airbag cushion 623 through the absorption cover 622 and the air pump C621. The gas can make the plastic balls in the airbag cushion 623 continuously hit the inner wall of the airbag cushion 623, so that the airbag cushion 623 vibrates, which promotes the discharge of impurities from the honeycomb catalyst 22 on the airbag cushion 623. Secondly, a pressure relief valve is also installed on the outer surface of the airbag cushion 623. When there is more gas in the airbag cushion 623, the pressure relief valve is opened to release the pressure.

[0031] A controller 7 is provided on the outer surface of the reaction box 2, and a main control module 71 is provided inside the controller 7. The main control module 71 is connected to the nitrogen oxide analysis module 72 by signal, the nitrogen oxide analysis module 72 is connected to the flue gas pretreatment module 73 by signal, the flue gas pretreatment module 73 is connected to the reducing agent control module 74 by signal, the reducing agent control module 74 is connected to the temperature control module 75 by signal, and the temperature control module 75 is connected to the emission monitoring module 76 by signal. The denitration operation is performed through the main control module 71 in the controller 7, and the nitrogen oxide analysis module 72 is connected to the nitrogen oxide concentration detection unit provided at the air inlet of the air inlet box 1 by signal, so as to classify the nitrogen oxide content and type in the initial flue gas. The nitrogen oxide concentration and proportion are analyzed and calculated. The amount of ammonia released by the reducing agent is controlled according to the calculated data. The overall operation of the pretreatment component 5 is controlled by the flue gas pretreatment module 73. The overall operation of the jet component 4 is controlled by the reducing agent control module 74. The internal reaction temperature of the reaction box 2 is controlled within a suitable range by the temperature control module 75. The emission monitoring module 76 is connected to the signal of the nitrogen oxide concentration detection unit arranged at the air outlet of the reaction box 2. Finally, the emission monitoring module 76 is used to calculate the nitrogen oxide content in the flue gas after treatment at the air outlet of the reaction box 2 to determine whether it meets the standard. The denitrification of the flue gas is achieved through automatic control, which greatly improves the overall work efficiency and reduces the work cost.

[0032] Specifically, during the working process, there will still be a small amount of dust in the flue gas after denitrification. When it passes through the honeycomb catalyst 22, the dust will remain in the honeycomb catalyst 22. If it is not cleaned for a long time, it will cause the honeycombs inside the honeycomb catalyst 22 to be blocked, affecting the reaction quality. By opening the electric control door, the honeycomb catalyst 22 enters the processing box 61, and then the air pump C621 is started. The suction force generated can suck the impurities on the surface of the honeycomb catalyst 22 into the airbag cushion 623 through the absorption cover 622 and the air pump C621, thereby achieving the cleaning of the honeycomb catalyst 22, ensuring the working quality of the honeycomb catalyst 22, and indirectly improving the overall denitrification working quality.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flue gas denitration device suitable for a power plant, comprising an air intake box (1), a reaction box (2) arranged at one end of the air intake box (1), characterized in that: An injection component (4) for injecting ammonia gas is arranged on the outer surface of the air intake box (1), and a pretreatment component (5) is arranged inside the air intake box (1); The pretreatment component (5) comprises a filter bag (51) arranged inside the air intake box (1), cushion blocks (52) arranged on both sides of the inner wall of the air intake box (1), and a swing assembly (54) arranged on the upper end of the filter bag (51), and displacement blocks (53) are arranged on both sides of the filter bag (51), and the filter bag (51) is slidably connected to the cushion blocks (52) via the displacement blocks (53); A swing groove is provided at the top of the inner wall of the air intake box (1). The swing assembly (54) comprises a docking block (541) slidably arranged inside the swing groove, and a connecting rod (542) penetrating inside the docking block (541). The lower end of the docking block (541) is connected to the filter bag (51). A magnetic block A (543) is provided at one end of the connecting rod (542). A mounting block (544) is provided at the other end of the connecting rod (542). A return spring (545) is provided on one side of the mounting block (544). One end of the return spring (545) is connected to the inner wall of the swing groove. A magnetic block B (546) is provided inside the swing groove. The magnetic block B (546) and the magnetic block A (543) are opposite to each other and magnetically repel each other.

2. A flue gas denitrification device suitable for a power plant as claimed in claim 1, characterized in that: A clamping groove (5411) is provided on both sides of the docking block (541), and a roller (5412) is rotatably arranged inside the clamping groove (5411), and the outer surface of the roller (5412) contacts the inner wall of the swing groove.

3. A flue gas denitration device suitable for a power plant as claimed in claim 2, characterized in that: A pneumatic telescopic rod (547) is provided at the lower end of the docking block (541), and the pneumatic telescopic rod (547) is located inside the filter bag (51). An oblique support rod (548) is provided at the lower end of the pneumatic telescopic rod (547). Two groups of oblique support rods (548) are provided, and one end of each of the two groups of oblique support rods (548) is provided with a rubber block (549). The outer surfaces of the two groups of rubber blocks (549) are in contact with both sides of the filter bag (51), and the contact surface between the rubber block (549) and the filter bag (51) is a smoke blowing surface. One end of the pneumatic telescopic rod (547) is connected to an extension hose, and one end of the extension hose is connected to an air pump A (12) provided at the upper end of the air inlet box (1).

4. A flue gas denitration device suitable for a power plant as claimed in claim 3, characterized in that: A discharge assembly (56) is further provided inside the air intake box (1). A docking groove (11) is provided at the bottom of the air intake box (1). The discharge assembly (56) comprises a discharge plate (563) and an inclined plate (564) which are arranged inside the docking groove (11). One side of the discharge plate (563) is in contact with the inclined plate (564). An electric push rod (565) is provided on the other side of the discharge plate (563). One end of the electric push rod (565) is connected to the bottom surface of the air intake box (1). A collection box (566) is provided at the lower end of the air intake box (1). The collection box (566) is in communication with the docking groove (11).

5. A flue gas denitration device suitable for a power plant as claimed in claim 4, characterized in that: Two groups of filter bags (51) are provided. An air cushion block A (561) and an air cushion block B (562) are provided at the lower ends of the two groups of filter bags (51), respectively. One-way air outlet holes and one-way air inlet holes are provided on the outer surfaces of the air cushion block A (561) and the air cushion block B (562). In an initial state, the lower bottom surfaces of the air cushion block A (561) and the air cushion block B (562) are in contact with the upper surface of the blanking plate (563).

6. A flue gas denitration device suitable for a power plant as claimed in claim 5, characterized in that: A vibration assembly (55) is also provided inside the air intake box (1). The vibration assembly (55) comprises a toothed plate (551) provided at one end of the displacement block (53), a transmission rod (553) rotatably provided at the bottom of the air intake box (1), and a gear (552) provided on the outer surface of the transmission rod (553). The gear (552) is meshed with the toothed plate (551). A groove is provided on one side of the inclined plate (564). A spring sheet (5641) is provided inside the groove. A paddle (554) is also provided on the outer surface of the transmission rod (553). The paddle (554) corresponds to the spring sheet (5641).

7. A flue gas denitration device suitable for a power plant as claimed in claim 6, characterized in that: The jetting component (4) comprises an air storage box (41) arranged on the upper surface of the air intake box (1), air guide pipes (44) embedded in both sides of the air storage box (41), and an air pump B (45) arranged on the outer surface of the air guide pipe (44), one end of the air pump B (45) is connected to the air guide pipe (44), the other end of the air pump B (45) is provided with a transfer pipe (43), one end of the transfer pipe (43) is connected to the air storage box (41), one side of the air guide pipe (44) is connected to a short pipe (46), one end of the short pipe (46) is connected to a nozzle (47), and the short pipe (46) and the nozzle (47) are both located inside the air intake box (1).

8. A flue gas denitrification device suitable for a power plant as claimed in claim 1, characterized in that: A partition plate (21) is arranged inside the reaction box (2), and the partition plates (21) are arranged in multiple groups, and the multiple groups of partition plates (21) are arranged in a staggered manner.

9. A flue gas denitrification device suitable for a power plant as claimed in claim 8, characterized in that: A honeycomb catalyst (22) is also arranged inside one end of the reaction box (2) near the outlet, a connection port (23) is provided on the bottom surface of the reaction box (2), an electric control door is arranged inside the connection port (23), the connection port (23) and the honeycomb catalyst (22) are arranged in the same vertical plane, a processing component (6) is arranged at the lower end of the reaction box (2), the processing component (6) comprises a processing box (61) arranged at the lower end of the connection port (23), and a cleaning component (62) arranged on the outer surface of the processing box (61), the cleaning component (62) comprises a gas filter arranged on one side of the processing box (61), A pump C (621), docking hoses (625) arranged at both ends of the air pump C (621), and an absorption cover (622) arranged at one end of one set of the docking hoses (625), the absorption cover (622) being located inside the processing box (61), an airbag cushion (623) being arranged at the bottom of the processing box (61), another set of docking hoses (625) being connected to the airbag cushion (623), a plastic ball being placed inside the airbag cushion (623), an ash discharge pipe (624) being arranged at the lower end of the airbag cushion (623), one end of the ash discharge pipe (624) passing through the inner wall of the processing box (61) and being connected to the outside.

10. A flue gas denitration device suitable for a power plant as claimed in claim 9, characterized in that: A controller (7) is arranged on the outer surface of the reaction box (2), and a main control module (71) is arranged inside the controller (7). The main control module (71) is connected to a nitrogen oxide analysis module (72) by signal, the nitrogen oxide analysis module (72) is connected to a flue gas pretreatment module (73) by signal, the flue gas pretreatment module (73) is connected to a reducing agent control module (74) by signal, the reducing agent control module (74) is connected to a temperature control module (75) by signal, and the temperature control module (75) is connected to an emission monitoring module (76) by signal. Denitration operation is performed through the main control module (71) in the controller (7), and the nitrogen oxide analysis module (72) is connected to a nitrogen oxide analysis module (76) arranged at the air inlet of the air inlet box (1). The signal of the nitrogen oxide concentration detection unit is connected to the reaction box (2), the nitrogen oxide content and type in the initial flue gas are analyzed, the concentration and proportion of each nitrogen oxide are calculated, the amount of reducing agent ammonia released is controlled according to the calculated data, the overall operation of the pretreatment component (5) is controlled by the flue gas pretreatment module (73), the overall operation of the injection component (4) is controlled by the reducing agent control module (74), the internal reaction temperature of the reaction box (2) is controlled to be within a suitable range by the temperature control module (75), the emission monitoring module (76) is connected to the signal of the nitrogen oxide concentration detection unit arranged at the outlet of the reaction box (2), and finally the content of nitrogen oxide in the treated flue gas at the outlet of the reaction box (2) is calculated by the emission monitoring module (76).

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