High-temperature and high-dust SCR (Selective Catalytic Reduction) denitration system for cement 10000-ton line

Abstract

The invention relates to a cement ten-thousand-ton line high-temperature and high-dust SCR denitration system, and relates to the field of industrial flue gas treatment equipment.The system comprises two reactor bodies used for containing catalysts, one end of each reactor body is provided with a gas inlet pipe, the other end of each reactor body is provided with a gas outlet pipe, and each gas inlet pipe is internally provided with a wind uniformizing mechanism; an air pressure adjusting mechanism is mounted on each air outlet pipe, a communicating pipe is fixedly connected between the two reactor bodies, and a pressure equalizing mechanism for controlling the communicating pipe to open and close is mounted on the communicating pipe. The device has the effect that airflow entering the reactors can be conveniently and uniformly distributed in the two reactors.

Description

TECHNICAL FIELD

[0001] The application relates to the field of industrial flue gas treatment equipment, in particular to a cement 10,000-ton line high-temperature high-dust SCR denitration system. BACKGROUND

[0002] With the publication of the national and local pollutant emission standards such as the "Cement Industry Air Pollutant Emission Standard", considering the long-term development needs, each cement enterprise must carry out the upgrading and reconstruction of the kiln tail NOx emission to meet the current and future environmental protection requirements of ultra-low emission.

[0003] At present, the selective catalytic reduction (SCR) denitration technology is often used in the NOx treatment of the cement kiln, the selective catalytic reduction (SCR) denitration technology is the denitration technology with the highest denitration efficiency and the most market prospects at present, and has become the primary choice for controlling NOx emission in various industries at home and abroad. Due to the different flue gas characteristics from other industries, the technical requirements and difficulties in flue gas denitration are also different.

[0004] At present, the selective catalytic reduction (SCR) denitration technology in China is limited to the treatment capacity of 5000t / d and below, and has not been applied to the production line with a capacity of 10,000 tons and above. The main problem is that the increase of production capacity greatly increases the amount of reaction flue gas. Under the premise of ensuring the contact area of flue gas and catalyst, the reactor volume must continue to increase. The continuous increase of the reactor volume brings great challenges to the gas flow distribution into the reactor, especially in the peripheral area of the reactor. It is difficult for the flue gas to reach, and it is difficult for the gas flow in the reactor to be evenly distributed. SUMMARY

[0005] In order to facilitate the gas flow entering the reactor to be evenly distributed in the two reactors, the application provides a cement 10,000-ton line high-temperature high-dust SCR denitration system.

[0006] The cement 10,000-ton line high-temperature high-dust SCR denitration system provided by the application adopts the following technical scheme: A cement 10,000-ton line high-temperature high-dust SCR denitration system, comprising two reactor bodies for placing catalysts, one end of each of the reactor bodies is provided with a gas inlet pipe, and the other end is provided with a gas outlet pipe, a uniform air distribution mechanism is installed in each gas inlet pipe, a gas pressure adjusting mechanism is installed on each gas outlet pipe, a communication pipe is fixedly connected between the two reactor bodies, and a pressure equalizing mechanism for controlling the opening and closing of the communication pipe is installed on the communication pipe.

[0007] By adopting the technical scheme, flue gas enters two gas inlet pipes and then enters the reactor through the air equalizing mechanism to react with the catalyst. In this process, the air pressure adjusting mechanism on each reactor body is controlled to balance the air volume in the two reactor bodies as much as possible, reducing the occurrence of overload consumption in a single reactor body. When the air pressure difference between the two reactor bodies is too large, the pressure equalizing mechanism can be opened to connect the two reactor bodies through the communication pipe, realizing self-regulation of the system and facilitating uniform distribution of the air flow entering the reactor. This can be stably and efficiently applied to the cement 10,000-ton line high-temperature and high-dust SCR denitrification, meet the ultra-low emission of NOx at the kiln tail of the 10,000-ton line, and solve the problem of uneven air distribution in the reaction body caused by increased production capacity.

[0008] Preferably, the air equalizing mechanism comprises two air distribution baffles and a guide plate arranged from top to bottom, each air distribution baffle is hung in the gas inlet pipe, a plurality of inclined air distribution holes are formed in each air distribution baffle, the air distribution holes on the two air distribution baffles are opposite in inclination direction, the guide plate is fixedly connected in the gas inlet pipe, and a plurality of vertical guide holes are formed in the guide plate.

[0009] By adopting the technical scheme, the flue gas entering the gas inlet pipe can be inclined and distributed in two different directions, and the flue gas can be preliminarily dispersed and guided. The guide plate is fixed in the gas inlet pipe and has vertical guide holes formed thereon, so that the flue gas distributed by the air distribution baffle can flow vertically downward, and the flue gas can enter the reactor body uniformly, ensuring good contact area and contact effect between the flue gas and the catalyst and improving the efficiency and stability of the denitrification reaction.

[0010] Preferably, the air distribution baffle comprises a frame and a plurality of air distribution rods rotatably connected in the frame, the air distribution holes are between adjacent two air distribution rods, and a fastener for locking the air distribution rod and the frame is connected to each air distribution rod.

[0011] By adopting the technical scheme, the locking of each air distribution rod is released by adjusting the fastener, so that each air distribution rod can be rotated to adjust the inclination angle of the air distribution rod and then adjust the inclination angle of the air distribution hole.

[0012] Preferably, pressure sensors are installed in the gas inlet pipe and the gas outlet pipe.

[0013] By adopting the technical scheme, the pressure sensors installed in the gas inlet pipe and the gas outlet pipe can monitor the pressure in the gas inlet pipe and the gas outlet pipe in real time, provide data support for the adjustment of the air pressure adjusting mechanism and the pressure equalizing mechanism, and adjust the air pressure in the reactor body in time to ensure stable system pressure and meet the demand for efficient and stable operation of the cement 10,000-ton line high-temperature and high-dust SCR denitrification system.

[0014] Preferably, the gas pressure adjusting mechanism comprises a butterfly valve installed on the gas outlet pipe.

[0015] By adopting the above technical scheme, the butterfly valve installed on the gas outlet pipe as the gas pressure adjusting mechanism can flexibly adjust the pressure in the gas outlet pipe by controlling the opening size of the butterfly valve, thereby effectively adjusting the pressure of each reactor body chamber, making the air volume processed by the two chambers as balanced as possible, and ensuring the stability and high efficiency of the operation of the entire 10,000-ton cement line high-temperature and high-dust SCR denitration system.

[0016] Preferably, the gas pressure adjusting mechanism comprises a plurality of air adjusting plates hinged to the inner wall of the gas outlet pipe, the plurality of air adjusting plates are vertically arranged, a driving member for driving each air adjusting plate to rotate up and down is installed on the gas outlet pipe, and each air adjusting plate is hinged to the inner side wall of the gas outlet pipe opposite to the inner side wall where the adjacent air adjusting plate is hinged.

[0017] By adopting the above technical scheme, the plurality of air adjusting plates vertically arranged and hinged to the inner wall of the gas outlet pipe rotate up and down under the driving of the driving member, which can form air ducts of different shapes and sizes, thereby changing the ventilation cross-sectional area and air flow path in the air duct, effectively adjusting the air pressure, and making the system better adapt to and process flue gas under different working conditions, thereby ensuring the stable operation of the 10,000-ton cement line high-temperature and high-dust SCR denitration system. In addition, the ash generated by the denitration inside the reactor body will also fall along the airflow along the gas outlet pipe, and the air adjusting plate forms an inclined plate body in the process of rotating, which is convenient for the falling of the ash.

[0018] Preferably, the upper surface of each air adjusting plate is slidably connected with an ash scraping rod, and an adjusting mechanism for driving the ash scraping rod to move towards or away from the hinged end of the air adjusting plate is installed on the gas outlet pipe.

[0019] By adopting the above technical scheme, the ash scraping rod on the air adjusting plate can clean the accumulated ash on the air adjusting plate, reducing the situation that the accumulated ash affects the normal work of the air adjusting plate.

[0020] Preferably, the adjusting mechanism comprises a wire reel one and a wire reel two rotationally connected to the corresponding inner side wall of the air outlet pipe, the wire reel one is wound with a wire rope one, one end of the wire rope one is fixedly connected with the ash scraping rod, the wire reel two is wound with a wire rope two, the wire reel one is coaxially fixed with a gear one, the wire reel two is coaxially fixed with a gear two, the gear one and the gear two are engaged, the inner side wall of the air outlet pipe is provided with a guide groove, the guide groove is slidably connected with an adjusting block and a counterweight block arranged in a vertical mode, one end of the wire rope two is fixedly connected with the adjusting block, the adjusting block and the counterweight block are fixedly connected with mutually adsorbed magnet layers on the surfaces close to each other, the mass of the adjusting block is less than the mass of the ash scraping rod, the mass of the ash scraping rod is less than the sum of the masses of the adjusting block and the counterweight block, the lower end of the side wall of the air register away from the ash scraping rod is fixedly connected with a magnetic shielding block, and the end of the magnetic shielding block away from the air register is gradually tapered into a pointed end for being inserted between the adjusting block and the counterweight block.

[0021] By adopting the technical scheme, when the air register is rotated to gradually contact the inner side wall of the air outlet pipe, the magnetic shielding block is inserted between the adjusting block and the counterweight block to separate the two, at this time, the counterweight block is separated from the adjusting block. Since the mass of the ash scraping rod is greater than the mass of the adjusting block, under the action of gravity, the ash scraping rod slides along the air register and scrapes off the ash on the air register. During the movement of the ash scraping rod, the ash scraping rod pulls the wire reel one to rotate through the wire rope one, and the wire reel one rotates to drive the wire reel two to rotate through the gear one and the gear two. The wire reel two rotates to wind the wire rope two, so as to pull the adjusting block to slide upward.

[0022] When the air register is rotated to the direction away from the counterweight block and gradually becomes an inclined state, the magnetic shielding block is separated from the adjusting block and the counterweight block, the counterweight block moves upward under the action of the magnet layer and is adsorbed to the adjusting block. Since the mass of the ash scraping rod is less than the sum of the masses of the adjusting block and the counterweight block, the adjusting block and the counterweight block are lowered together under the action of gravity, so as to pull the wire rope two to be unwound, and then the wire reel two is driven to rotate through the gear two and the gear one and the wire rope one is wound, the ash scraping rod moves upward to the upper end of the air register, so that the reset of the ash scraping rod is completed. It is convenient to automatically clean the accumulated ash on the air register.

[0023] Preferably, the inner side wall of the air outlet pipe is fixedly connected with a plurality of protective covers for covering the corresponding wire reel one and wire reel two inside.

[0024] By adopting the technical scheme, the wire reel one and the wire reel two are covered inside the protective cover arranged on the inner side wall of the air outlet pipe, so that the situation that the wire reel one and the wire reel two are affected by external factors is reduced, the inclined surface of the protective cover can make the dust and impurities slide off and reduce accumulation, and the installation opening arranged on the bottom surface can ensure that the wire rope one and the wire rope two are normally used.

[0025] In summary, the present application has at least one of the following beneficial technical effects: 1. The gas flow entering the reactor is evenly distributed in the reactor, which can be stably and efficiently applied to the cement 10000-ton line high-temperature high-dust SCR denitration, meet the 10000-ton line kiln tail NOx ultra-low emission, and solve the problem of uneven gas flow distribution in the reaction body caused by increased production capacity; 2. The air adjusting plates arranged vertically and hinged to the inner wall of the air outlet pipe can form air ducts of different shapes and sizes to effectively adjust the air pressure, and the air adjusting plates form inclined plates during rotation, which facilitates the falling of ash and slag; 3. The accumulated ash on the air adjusting plate can be easily cleaned automatically. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure diagram of the double-channel self-balancing denitration system according to the embodiment one of the present application.

[0027] Figure 2 is a structure diagram of the air uniformizing mechanism according to the embodiment one of the present application.

[0028] Figure 3 is a structure diagram of the air pressure adjusting mechanism according to the embodiment two of the present application.

[0029] Figure 4 is a structure diagram of the adjusting mechanism according to the embodiment two of the present application.

[0030] Explanation of reference signs: 1, reactor body; 11, air inlet pipe; 12, air outlet pipe; 121, guide groove; 13, communication pipe; 2, pressure equalizing mechanism; 3, air pressure adjusting mechanism; 31, air adjusting plate; 4, air uniformizing mechanism; 41, air dividing baffle; 411, air dividing rod; 42, guide plate; 421, guide rod; 43, hoisting rod; 5, ash scraping rod; 6, adjusting mechanism; 61, fixed block one; 62, fixed block two; 63, line wheel one; 631, line rope one; 64, line wheel two; 641, line rope two; 65, gear one; 66, gear two; 67, adjusting block; 68, counterweight block; 69, magnetic isolation block; 7, protective cover. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0032] Embodiment one The embodiment of the present application discloses a cement 10000-ton line high-temperature high-dust SCR denitration system. Referring to Figure 1 and Figure 2, the denitration system is double-bin design, including two reactor bodies 1, the upper end of each reactor body 1 is fixedly connected with the air inlet pipe 11, and the lower end is fixedly connected with the air outlet pipe 12. The lower ends of the two reactor bodies 1 are fixedly connected with the communication pipe 13, and the equalizing mechanism 2 is installed on the communication pipe 13. The equalizing mechanism 2 is used for adjusting whether the communication pipe 13 is unobstructed.

[0033] The air pressure adjusting mechanism 3 is installed on each air outlet pipe 12, which is used for adjusting the pressure in each reactor body 1. The pressure sensor is installed in the air inlet pipe 11 and the air outlet pipe 12 of each reactor body 1.

[0034] The pressure in each reactor body 1 is adjusted by the air pressure adjusting mechanism 3, so that the amount of wind treated in the two reactor bodies 1 is as balanced as possible. When the difference between the two reactor bodies 1 is large, the equalizing mechanism 2 is adjusted to open the communication pipe 13, so that the two reactor bodies 1 are connected with each other, thereby realizing self-adjustment of the system.

[0035] The equalizing mechanism 2 is a switch valve, which can be a manual valve or an electric valve.

[0036] The reactor body 1 usually places multiple layers of catalysts for denitration of flue gas. After the single flue gas is transported to the vicinity of the system, it is divided into two pipes and enters the reactor body 1 from the corresponding air inlet pipe 11, achieving the effect of single flue gas treated by double reactor bodies 1.

[0037] The air inlet pipe 11 also has an air equalizing mechanism 4. The air equalizing mechanism 4 includes two air distribution baffles 41 and a flow guide plate 42 arranged from top to bottom. The air distribution baffle 41 includes a frame and a plurality of air distribution rods 411 rotatably connected inside the frame. The air distribution rods 411 are distributed along the length direction of the frame, and an inclined air distribution hole is formed between every two adjacent air distribution rods 411. The inclined directions of the air distribution holes on the two air distribution baffles 41 are opposite. The air distribution rod 411 is connected with a fastener that fixes the air distribution rod 411 and the frame.

[0038] Both ends of each air distribution rod 411 are fixedly connected with a rotating shaft, the rotating shaft penetrates the frame and is threadedly connected with a nut tightly abutting the frame. By loosening the nut, the air distribution baffle 41 can be rotated to adjust the inclination of the air distribution baffle 41, and then adjust the inclination of the air distribution hole.

[0039] The flow guide plate 42 also includes a frame and a plurality of flow guide holes 421 formed in the frame.

[0040] Each of the air distribution baffles 41 is hung in the air inlet pipe 11. Specifically, each of the air distribution baffles 41 is hinged with a hanging rod 43 at four corners, and the upper end of the hanging rod 43 is hinged with the inner side wall of the air inlet pipe. The inclination of the air distribution hole can change the flow direction of the flue gas when passing through the air distribution baffle 41, so as to realize the preliminary uniform distribution. Under the pushing of the flue gas, the air distribution baffle 41 can sway, further uniformly distributing the airflow. The flow guide plate 42 is welded or bolted and fixed in the air inlet pipe 11. The vertical arrangement of the flow guide hole 421 can make the flue gas flow vertically downward, facilitating the direct contact and full reaction of the flue gas with the catalyst.

[0041] The gas pressure adjusting mechanism 3 includes a butterfly valve installed on the air outlet pipe 12, which adjusts the gas pressure in the reactor body 1 by rotating the valve plate. The butterfly valve can be selected from a manual butterfly valve and an electric butterfly valve.

[0042] The implementation principle of the cement 10,000-ton line high-temperature and high-dust SCR denitration system of the embodiment is as follows: the denitration system introduces the flue gas into the reactor body 1 through the air inlet pipe 11, and the air distribution mechanism 4 makes the flue gas uniformly enter the reactor to contact and react with the catalyst. The gas pressure adjusting mechanism 3 can adjust the gas pressure in the reactor according to the actual situation, so as to ensure the stable operation of the system. When the gas pressure adjusting mechanism 3 is difficult to adjust the pressure in the two reactor bodies 1 to be relatively balanced, the pressure equalizing mechanism 2 is opened to realize the pressure balance between the two reactor bodies 1.

[0043] Embodiment two The embodiment of the application discloses a cement 10,000-ton line high-temperature and high-dust SCR denitration system, which is different from the embodiment one in that Figure 3 and Figure 4 The gas pressure adjusting mechanism 3 includes a plurality of air adjusting plates 31 hinged on the inner wall of the air outlet pipe 12, the plurality of air adjusting plates 31 are vertically arranged, each of the air adjusting plates 31 is hinged with the inner side wall of the air outlet pipe 12 opposite to the inner side wall of the air outlet pipe 12 hinged with the adjacent air adjusting plate 31, and the air outlet pipe 12 is installed with a driving member for driving each of the air adjusting plates 31 to rotate up and down. According to the requirement, the rotation of different numbers of the air adjusting plates 31 to the inclined state is adjusted, and the inclination angle of the air adjusting plate 31 is adjusted according to the requirement, so as to form the air outlet pipe 12 with different shapes and ventilation volumes, thereby facilitating the adjustment of the pressure in the reactor body 1.

[0044] The driving member includes a plurality of speed reduction motors fixed on the outer side wall of the air outlet pipe 12, and the output shaft of each of the speed reduction motors is fixedly connected with the hinged position of the upper end of the air adjusting plate 31, for driving the air adjusting plate 31 to rotate.

[0045] Ash will be produced in the denitration reaction, and the ash will be discharged from the air outlet pipe 12 together with the airflow. The air adjusting plate 31 arranged obliquely is difficult to affect the normal falling of the ash. That is, the ash falls on each air adjusting plate 31 and then slides along the air adjusting plate 31. However, part of the ash will be retained on the air adjusting plate 31. In order to clean the ash retained on the air adjusting plate 31, a scraping rod 5 is slidably connected to each air adjusting plate 31, and an adjusting mechanism 6 is installed on the air outlet pipe 12 to drive the scraping rod 5 to move towards or away from the hinge end of the air adjusting plate 31.

[0046] With reference to Figure 3 and Figure 4 , one adjusting mechanism 6 corresponds to one scraping rod 5, a plurality of grooves are formed in the inner side wall of the air outlet pipe 12, the adjusting mechanism 6 comprises a pair of fixed block one 61 and a pair of fixed block two 62 fixedly connected in each groove, a wire wheel one 63 is rotatably connected between the pair of fixed block one 61, a wire wheel two 64 is rotatably connected between the pair of fixed block two 62, and the wire wheel one 63 and the wire wheel two 64 are located above the air adjusting plate 31. A gear one 65 is coaxially fixed on the wire wheel one 63, a gear two 66 is coaxially fixed on the wire wheel two 64, the gear one 65 and the gear two 66 are engaged, and the diameter of the gear one 65 is smaller than the diameter of the gear two 66. A guide groove 121 is formed in the inner side wall of the air outlet pipe 12, and an adjusting block 67 and a counterweight block 68 arranged in a vertical manner are slidably connected in the guide groove 121.

[0047] The wire rope one 631 is wound on the wire wheel one 63, one end of the wire rope one 631 extends downward and is fixedly connected with the scraping rod 5, the wire rope two 641 is wound on the wire wheel two 64, one end of the wire rope two 641 penetrates through the bottom wall of the groove and extends into the guide groove 121 and is fixedly connected with the adjusting block 67. The mutually approaching surfaces of the adjusting block 67 and the counterweight block 68 are fixedly connected with mutually adsorbed magnet layers, the mass of the adjusting block 67 is less than the mass of the scraping rod 5, and the mass of the scraping rod 5 is less than the sum of the masses of the adjusting block 67 and the counterweight block 68. The wire rope one 631 and the wire rope two 641 are high-temperature-resistant ropes.

[0048] The lower end of the side wall of the air adjusting plate 31 away from the scraping rod 5 is fixedly connected with a magnetic shielding block 69, and the end away from the air adjusting plate 31 of the magnetic shielding block 69 gradually shrinks into a sharp end for inserting between the adjusting block 67 and the counterweight block 68. A plurality of protective covers 7 are fixedly connected to the inner side wall of the air outlet pipe 12, each protective cover 7 corresponds to one adjusting mechanism 6, the protective cover 7 covers the corresponding wire wheel one 63 and wire wheel two 64 inside, and the upper surface of the protective cover 7 is inclined.

[0049] When the air register 31 rotates towards the inner wall of the air outlet pipe 12, the magnetic isolation block 69 moves with the air register 31. Until the magnetic isolation block 69 is inserted between the adjusting block 67 and the counterweight block 68, the magnetic isolation block 69 will break the magnetic force between them and separate the adjusting block 67 and the counterweight block 68. At this time, the dust scraping rod 5 is lowered along the air register 31 because the mass of the dust scraping rod 5 is greater than the mass of the adjusting block 67. The dust scraping rod 5 drives the wire rope I 631 to rotate the wire wheel I 63, and the wire wheel I 63 drives the wire wheel II 64 through the gear I 65 and the gear II 66, so that the wire rope II 641 pulls the adjusting block 67 to move upwards. In this way, the dust scraping plate can scrape off the dust accumulated on the air register 31 during the descending process, and at this time, the air register 31 is vertically downward, and the dust is more likely to fall off.

[0050] When the air register 31 rotates reversely, that is, the air register 31 gradually rotates upwards, the magnetic isolation block 69 moves away from between the adjusting block 67 and the counterweight block 68, and the counterweight block 68 slides upwards under the action of the magnetic force and is adsorbed with the adjusting block 67. Because the sum of the mass of the adjusting block 67 and the counterweight block 68 is greater than the mass of the dust scraping rod 5, the adjusting block 67 and the counterweight block 68 together descending will pull the wire rope II 641 to reversely rotate the wire wheel II 64, and then reversely rotate the wire wheel I 63 through the gear transmission, pull the dust scraping rod 5 to rise and return to the initial position. In this way, when the air register 31 rotates to be vertically arranged, the dust scraping rod 5 can automatically slide downwards and scrape off the dust on the air register 31, and when the air register 31 rotates to be in an inclined state, the dust scraping rod 5 can automatically reset.

[0051] The implementation principle of the cement ten-thousand-ton SCR denitration system of the embodiment of the application is that the dust scraping rod 5 and the adjusting mechanism 6 are added, which can effectively remove the dust accumulated on the air register 31, further improve the reliability and stability of the air pressure adjusting mechanism 3, facilitate the adjustment of the pressure in the reactor body 1, and thus ensure the long-term stable operation of the entire denitration system and reduce the system downtime maintenance time caused by the failure of the air register 31.

[0052] The above are preferred embodiments of the application, which do not limit the protection scope of the application. Therefore, any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A cement 10,000-ton SCR denitration system at high temperature and high dust, characterized in that: The application relates to a catalyst reaction device, which comprises two reactor bodies (1) for placing catalysts, one end of each of the reactor bodies (1) is provided with an air inlet pipe (11), the other end is provided with an air outlet pipe (12), an air uniform mechanism (4) is arranged in each air inlet pipe (11), an air pressure adjusting mechanism (3) is arranged on each air outlet pipe (12), and a communication pipe (13) is fixedly connected between the two reactor bodies (1), wherein a pressure equalizing mechanism (2) for controlling the opening and closing of the communication pipe (13) is arranged on the communication pipe (13).

2. The cement plant high-temperature high-dust SCR denitration system according to claim 1, characterized in that: The air uniform mechanism (4) comprises two air distribution baffles (41) and a guide plate (42) arranged from top to bottom, each air distribution baffle (41) is hung in the air inlet pipe (11), a plurality of air distribution holes are formed in each air distribution baffle (41) and arranged in an inclined mode, the air distribution holes in the two air distribution baffles (41) are oppositely inclined, and the guide plate (42) is fixedly connected in the air inlet pipe (11) and is provided with a plurality of vertical guide holes (421).

3. The cement production line high-temperature and high-dust SCR denitration system according to claim 2, characterized in that: The air distribution baffle (41) comprises a frame and a plurality of air distribution rods (411) rotatably connected in the frame, the air distribution holes are formed between two adjacent air distribution rods (411), and a fastener for locking the air distribution rod (411) and the frame is connected to each air distribution rod (411).

4. The high-temperature and high-dust SCR denitration system for a 10,000-ton cement production line according to claim 1, characterized in that: Pressure sensors are arranged in the air inlet pipe (11) and the air outlet pipe (12).

5. The high-temperature and high-dust SCR denitration system for a 10,000-ton cement production line according to claim 1, characterized in that: The air pressure adjusting mechanism (3) comprises a butterfly valve arranged on the air outlet pipe (12).

6. The high-temperature and high-dust SCR denitration system for a 1000-ton cement production line according to claim 1, characterized in that: The air pressure adjusting mechanism (3) comprises a plurality of air adjusting plates (31) hinged to the inner wall of the air outlet pipe (12), the air adjusting plates (31) are vertically arranged, a driving element for driving each air adjusting plate (31) to rotate up and down is arranged on the air outlet pipe (12), and each air adjusting plate (31) is hinged to the inner side wall of the air outlet pipe (12) opposite to the inner side wall of the air outlet pipe (12) hinged to the adjacent air adjusting plate (31).

7. The cement production line high-temperature and high-dust SCR denitration system according to claim 6, characterized in that: The upper surface of each air adjusting plate (31) is slidably connected with a dust scraping rod (5), and an adjusting mechanism (6) for driving the dust scraping rod (5) to move towards or away from the hinged end of the air adjusting plate (31) is arranged on the air outlet pipe (12).

8. The cement production line high-temperature and high-dust SCR denitration system according to claim 7, characterized in that: The adjusting mechanism (6) comprises a wire wheel one (63) and a wire wheel two (64) which are rotationally connected to the corresponding inner side wall of the air outlet pipe (12), the wire wheel one (63) is wound with a wire rope one (631), one end of the wire rope one (631) is fixedly connected with the ash scraping rod (5), the wire wheel two (64) is wound with a wire rope two (641), the wire wheel one (63) is coaxially fixed with a gear one (65), the wire wheel two (64) is coaxially fixed with a gear two (66), the gear one (65) and the gear two (66) are engaged, the inner side wall of the air outlet pipe (12) is provided with a guide groove (121), the guide groove (121) is slidably connected with an adjusting block (67) and a counterweight block (68) which are arranged in an up-down mode, one end of the wire rope two (641) is fixedly connected with the adjusting block (67), the mutually approaching surfaces of the adjusting block (67) and the counterweight block (68) are fixedly connected with magnet layers which are mutually adsorbed, the mass of the adjusting block (67) is less than the mass of the ash scraping rod (5), the mass of the ash scraping rod (5) is less than the sum of the masses of the adjusting block (67) and the counterweight block (68), the lower end of the side wall of the air register (31) which is away from the ash scraping rod (5) is fixedly connected with a magnetic shielding block (69), the end of the magnetic shielding block (69) which is away from the air register (31) is gradually tapered into a pointed end which is used for being inserted between the adjusting block (67) and the counterweight block (68).

9. The cement production line high-temperature and high-dust SCR denitration system according to claim 8, characterized in that: The inner side wall of the air outlet pipe (12) is fixedly connected with a plurality of protective covers (7) which cover the corresponding wire wheel one (63) and wire wheel two (64) inside, and the upper surface of the protective cover (7) is a slope.

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