A device for denitration of high dust flue gas of a cement kiln by SCR
By combining the electrostatic precipitator and the spraying mechanism, the problems of poor dust removal and insufficient denitrification in the SCR denitrification device for high-dust flue gas are solved, achieving efficient dust removal and flue gas purification.
Patent Information
- Application Number
- CN202522104371.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-29
AI Technical Summary
In existing high-dust flue gas SCR denitrification devices, electrostatic dust removal is ineffective, easily causing dust to be stirred up, and denitrification is insufficient, reducing denitrification efficiency.
The system employs a combination of electrostatic dust removal mechanism, ash discharge port, casing, dust removal mechanism, and dust collection components. By controlling the dust removal mechanism, dust is scraped off and absorbed. Combined with the spray mechanism, a reducing agent is sprayed in to carry out the denitrification reaction, and a catalyst is used to reduce NOx to N2 and H2O.
It improves dust removal efficiency, prevents dust from being stirred up, enhances denitrification efficiency, and achieves efficient dust removal and flue gas purification.
Smart Images
Figure CN224672474U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high-dust flue gas denitrification technology, and in particular to an SCR denitrification device for high-dust flue gas in cement kilns. Background Technology
[0002] Cement kilns are a type of lime kiln in the building materials equipment category, mainly used for calcining cement clinker. They are core equipment in both dry and wet process production lines, and are used in cement manufacturing, metallurgy, chemical engineering, and environmental protection. Flue gas denitrification refers to the technology of reducing nitrogen oxides in flue gas to nitrogen to reduce pollution. It is mainly used in industrial fields such as thermal power plants and steel enterprises. High-dust flue gas SCR denitrification technology is a denitrification solution designed for high-dust flue gas environments in industrial kilns (such as cement kilns and coal-fired boilers). The existing technologies have the following problems: Existing high-dust flue gas SCR denitrification devices typically use electrostatic dust removal to remove dust from the flue gas. The principle of vibration is used to remove the attached dust, which easily causes the dust to be stirred up, resulting in poor dust removal effect. Secondly, it is not sufficient for high-dust flue gas SCR denitrification, reducing the denitrification efficiency. Utility Model Content
[0003] The main purpose of this invention is to provide an SCR denitrification device for high-dust flue gas in cement kilns, which can effectively solve the problems of poor dust removal and insufficient denitrification.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A SCR denitrification device for high-dust flue gas in cement kilns includes a flue. At the front and rear ends of the flue, inlet channels are fixedly connected. An electrostatic precipitator is installed inside the front inlet channel. A housing is fixedly connected to the top of the front inlet channel. A vertically extending ash discharge port is opened at the bottom of the front inlet channel near the front of the electrostatic precipitator. A dust removal mechanism is installed inside the front inlet channel near the front of the electrostatic precipitator, with the top of its outer wall extending into the housing. A dust collection assembly is installed at the bottom of the front inlet channel. A reducing agent tank is fixedly connected to the top of the rear inlet channel. A spray mechanism is installed at the top of the flue, with the bottom of its outer wall extending to the left and right sides of the flue. A liquid collection box is fixedly connected to the bottom of the flue, and a drain valve pipe is fixedly connected to the bottom of the left end of the liquid collection box.
[0005] Preferably, the electrostatic dust removal mechanism includes an insulating ceramic frame, a metal filter plate, an electrostatic generator, and two electrode wires. The outer wall of the metal filter plate is fixedly connected to the inside of the metal filter plate, and the surface of the metal filter plate is honeycomb-shaped. The ends of the two electrode wires are electrically connected to the connection ends at the bottom of the electrostatic generator, and the tails of the two electrode wires extend to the top of the metal filter plate and are electrically connected to each other. The outer wall of the insulating ceramic frame is fixedly connected to the inner wall of the smoke inlet channel, and the outer side of the electrostatic generator is fixedly connected to the inner wall of the casing.
[0006] Preferably, the dust removal mechanism includes a stepper motor, a lead screw, a slide rod, two sleeves, a connecting plate, a cleaning assembly, and a U-shaped protective shell. The output shaft of the stepper motor is fixedly connected to the upper end of the lead screw. The opposing surfaces of the two sleeves are fixedly connected to the left and right ends of the connecting plate. The outer wall of the lead screw is threadedly connected to the inner wall of the right sleeve. The outer wall of the slide rod is slidably connected to the inside of the left sleeve. The cleaning assembly is located at the rear end of the connecting plate, and the inside of the U-shaped protective shell is located on the outer wall of the lead screw.
[0007] Preferably, the top of the stepper motor is fixedly connected to the inside of the housing, the lower end of the lead screw is rotatably connected to the bottom of the inner wall of the smoke inlet channel, the upper and lower ends of the slide rod are fixedly connected to the inner wall of the smoke inlet channel respectively, and the bottom of the U-shaped protective shell is fixedly connected to the inner wall of the smoke inlet channel.
[0008] Preferably, the cleaning assembly includes a cleaning plate, a scraper, several sets of bristles, and two connecting blocks. One end of the scraper is fixedly connected to the top of the rear end of the cleaning plate. One end of each set of bristles is fixedly connected in an equidistant array to the bottom of the rear end of the cleaning plate. The rear ends of the two connecting blocks are fixedly connected to the left and right sides of the front end of the cleaning plate. The front ends of the two connecting blocks are fixedly connected to the rear end of the connecting plate. The outer walls of the scraper and bristles overlap with the surface of the metal filter plate.
[0009] Preferably, the dust collection assembly includes a dust collection box, a cover plate, a sealing gasket, a vacuum cleaner, two mounting plates, and two bolts. The bottom of the dust collection box is fixedly connected to the bottom of the smoke inlet channel. One end of the cover plate is fixedly connected to the outer surface of the sealing gasket. The outer wall of the sealing gasket engages with the interior of the dust collection box. The exterior of the vacuum cleaner is fixedly connected to the back of the dust collection box. The output pipe of the vacuum cleaner passes through the inner wall of the dust collection box and is fixedly connected to it. One end of each of the two mounting plates is fixedly connected to the left and right sides of the rear end of the cover plate near the sealing gasket. A through-hole is provided in the middle of each of the two mounting plates. Threaded holes are provided on the front sides of the left and right ends of the dust collection box. The outer wall of the bolt passes through the through-hole and is threaded to the inner wall of the threaded hole. An exhaust port is provided on the top of the left and right ends of the dust collection box. A filter screen is fixedly connected to the inner wall of each of the two exhaust ports. A dust inlet communicating with the ash discharge port is provided on the top of the dust collection box.
[0010] Preferably, the spraying mechanism includes a water pump, a pumping pipe, a collecting pipe, two branch pipes, several spray pipes, and several nozzles. The output port of the water pump is fixedly connected to one end of the pumping pipe, and the input pipe of the water pump is fixedly connected to the middle of the collecting pipe. The upper ends of the two branch pipes are fixedly connected to the left and right ends of the collecting pipe, respectively. One end of the several spray pipes is fixedly connected to the inner wall of the two branch pipes in an equidistant array. The other end of the outer wall of the several spray pipes extends into the interior of the flue and is fixedly connected to each other. The connecting end of the nozzle is fixedly connected to the other end of the spray pipe.
[0011] Preferably, the other end of the water pumping pipe is fixedly connected to one end of the reducing agent tank, and the left and right spray pipes are staggered. The bottom of the flue has a communication port that communicates with the liquid collection box.
[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model provides an SCR denitrification device for high-dust flue gas in cement kilns. It adopts the cooperation between an electrostatic dust removal mechanism, an ash discharge port, a casing, a dust removal mechanism, and a dust collection component. By controlling the lifting and lowering movement of the dust removal mechanism, the dust electrostatically adsorbed on the casing is scraped off. Combined with the control of a vacuum cleaner, the scraped dust is sucked into the dust collection box along the ash discharge port for collection. This solves the problem that existing high-dust flue gas SCR denitrification devices usually use electrostatic dust removal to remove dust from the flue gas and use the principle of vibration to remove the attached dust, which easily causes dust to be stirred up and the dust removal effect is poor. It achieves the beneficial effect of avoiding dust stirring up by using a dust suction method and improving the dust removal effect.
[0013] 2. This utility model provides an SCR denitrification device for high-dust flue gas in cement kilns. It utilizes the coordination between a flue, a reducing agent tank, a spraying mechanism, and a collection box. By controlling the spraying mechanism, the reducing agent is evenly sprayed into the flue and mixed with the high-temperature, high-dust flue gas. Under the action of a catalyst, NOx is reduced to N2 and H2O, achieving a denitrification reaction. This solves the problem of insufficient SCR denitrification of high-dust flue gas and reduced denitrification efficiency, thus achieving the beneficial effect of improving denitrification efficiency. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the SCR denitrification device for high-dust flue gas in cement kilns according to this utility model. Figure 2 This is a three-dimensional structural diagram of the electrostatic dust removal mechanism and the dust removal mechanism of this utility model; Figure 3 This is a three-dimensional structural diagram of the cleaning component of this utility model; Figure 4 This is a three-dimensional structural diagram of the dust collection component of this utility model; Figure 5 This is a three-dimensional structural diagram of the spraying mechanism of this utility model.
[0015] In the diagram: 1. Flue; 101. Connecting port; 2. Smoke inlet channel; 3. Electrostatic dust removal mechanism; 31. Insulating ceramic frame; 32. Metal filter plate; 33. Electrostatic generator; 34. Electrode wire; 4. Ash discharge port; 5. Housing; 6. Dust removal mechanism; 61. Stepper motor; 62. Lead screw; 63. Slide rod; 64. Sleeve; 65. Connecting plate; 66. Cleaning assembly; 661. Cleaning plate; 662. Scraper; 663. Brush bristles; 664. Connecting block; 67. U-shaped protective shell; 7. Dust collection assembly; 71. Dust collection box; 710. Threaded hole; 711. Exhaust port; 712. Dust inlet; 72. Cover plate; 73. Sealing gasket; 74. Vacuum cleaner; 75. Mounting plate; 750. Insertion hole; 76. Bolt; 8. Reducing agent tank; 9. Spraying mechanism; 91. Water pump; 92. Water suction pipe; 93. Water collection pipe; 94. Diverter pipe; 95. Spray pipe; 96. Spray head; 10. Liquid collection box; 11. Drain valve pipe. Detailed Implementation
[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0017] like Figure 1 As shown, an SCR denitrification device for high-dust flue gas in cement kilns includes a flue 1, with flue 2 fixedly connected to both the front and rear ends of the flue 1. An electrostatic dust removal mechanism 3 is installed inside the front flue 2, and a housing 5 is fixedly connected to the top of the front flue 2. A vertically penetrating ash discharge port 4 is opened at the bottom of the front flue 2 near the front side of the electrostatic dust removal mechanism 3. A dust removal mechanism 6 is installed inside the front flue 2 near the front side of the electrostatic dust removal mechanism 3, and the top of the outer wall of the dust removal mechanism 6 extends into the housing 5. A dust collection assembly 7 is installed at the bottom of the front flue 2. A reducing agent tank 8 is fixedly connected to the top of the rear flue 2. A spraying mechanism 9 is installed at the top of the flue 1, and the bottom of the outer wall of the spraying mechanism 9 extends to the left and right sides of the flue 1. A liquid collection box 10 is fixedly connected to the bottom of the flue 1, and a drain valve pipe 11 is fixedly connected to the bottom of the left end of the liquid collection box 10. The system includes an electrostatic dust removal mechanism 3, an ash discharge port 4, a casing 5, a dust removal mechanism 6, a dust collection component 7, a reducing agent tank 8, and a spraying mechanism 9. The electrostatic dust removal mechanism 3 filters dust from the flue gas using the principle of electrostatic dust collection. The dust removal mechanism 6 and the dust collection component 7 work together to efficiently remove dust adsorbed on the electrostatic dust removal mechanism 3. Combined with the spraying mechanism 9 and the liquid collection box 10, NOx can be reduced to N2 and H2O under the action of a catalyst, thus achieving denitrification.
[0018] like Figure 2 As shown, this utility model provides a technical solution for an SCR denitrification device for high-dust flue gas in cement kilns: the electrostatic dust removal mechanism 3 includes an insulating ceramic frame 31, a metal filter plate 32, an electrostatic generator 33, and two electrode wires 34. The outer wall of the metal filter plate 32 is fixedly connected to the inside of the metal filter plate 32, and the surface of the metal filter plate 32 is set in a honeycomb pattern. The ends of the two electrode wires 34 are electrically connected to the connection ends at the bottom of the electrostatic generator 33, and the tails of the two electrode wires 34 penetrate to the top of the metal filter plate 32 and are electrically connected to each other. The outer wall of the insulating ceramic frame 31 is fixedly connected to the inner wall of the flue gas inlet channel 2, and the outer side of the electrostatic generator 33 is fixedly connected to the inner wall of the housing 5. Through the principle of electrostatic dust removal, the gas is ionized by a high-voltage electric field, thereby charging the dust particles and adsorbing them by the electrodes. The dust removal mechanism 6 includes a stepper motor 61, a lead screw 62, a slide bar 63, two sleeves 64, a connecting plate 65, and a cleaning assembly. The output shaft of the stepper motor 61 is fixedly connected to the upper end of the lead screw 62. The opposite faces of the two sleeves 64 are fixedly connected to the left and right ends of the connecting plate 65. The outer wall of the lead screw 62 is threadedly connected to the inner wall of the right sleeve 64. The outer wall of the slide rod 63 is slidably connected to the inside of the left sleeve 64. The external part of the cleaning component 66 is set at the rear end of the connecting plate 65. The stepper motor 61 uses a threaded lifting method to remove dust adsorbed by the electrostatic dust removal mechanism 3. The inside of the U-shaped protective shell 67 is set on the outer wall of the lead screw 62. The U-shaped protective shell 67 is set to protect the outside of the lead screw 62 and prevent dust from adhering to the surface of the lead screw 62. The top of the stepper motor 61 is fixedly connected to the inside of the housing 5. The lower end of the lead screw 62 is rotatably connected to the bottom of the inner wall of the smoke inlet channel 2. The upper and lower ends of the slide rod 63 are fixedly connected to the inner wall of the smoke inlet channel 2 respectively. The bottom of the U-shaped protective shell 67 is fixedly connected to the inner wall of the smoke inlet channel 2.
[0019] like Figure 3 As shown, this utility model provides a technical solution for a high-dust flue gas SCR denitrification device in cement kilns: the cleaning component 66 includes a cleaning plate 661, a scraper 662, several sets of brush bristles 663, and two connecting blocks 664. One end of the scraper 662 is fixedly connected to the top of the rear end of the cleaning plate 661. One end of the several sets of brush bristles 663 is equidistantly arrayed and fixedly connected to the bottom of the rear end of the cleaning plate 661. The rear ends of the two connecting blocks 664 are fixedly connected to the left and right sides of the front end of the cleaning plate 661. The front ends of the two connecting blocks 664 are fixedly connected to the rear end of the connecting plate 65. The outer walls of the scraper 662 and the brush bristles 663 overlap with the surface of the metal filter plate 32. Through the cooperative operation of the scraper 662 and the brush bristles 663, the dust on the surface of the metal filter plate 32 is scraped and cleaned.
[0020] like Figure 4As shown, this utility model provides a technical solution for an SCR denitrification device for high-dust flue gas in cement kilns: the dust collection assembly 7 includes a dust collection box 71, a cover plate 72, a sealing gasket 73, a vacuum cleaner 74, two mounting plates 75, and two bolts 76. The bottom of the dust collection box 71 is fixedly connected to the bottom of the flue gas inlet channel 2. One end of the cover plate 72 is fixedly connected to the outer surface of the sealing gasket 73. The outer wall of the sealing gasket 73 engages with the inside of the dust collection box 71. The outside of the vacuum cleaner 74 is fixedly connected to the back of the dust collection box 71. The output pipe of the vacuum cleaner 74 passes through the inner wall of the dust collection box 71 and is fixedly connected to it. One end of each of the two mounting plates 75 is fixedly connected to the left and right sides of the rear end of the cover plate 72 near the sealing gasket 73. The middle of the two mounting plates 75... Each part of the dust collection box 71 has a through-hole 750 on both sides. The front side of each of the left and right ends of the dust collection box 71 has a threaded hole 710. The outer wall of the bolt 76 passes through the through-hole 750 and is threaded to the inner wall of the threaded hole 710. The cover plate 72 is installed on the dust collection box 71 by means of thread fixing. The sealing gasket 73 fits against the inner wall of the dust collection box 71, which can collect dust in the dust collection box 71 for easy disassembly and cleaning. The top of each of the left and right ends of the dust collection box 71 has an exhaust port 711. The inner wall of each exhaust port 711 is fixedly connected to a filter screen. The top of the dust collection box 71 has a dust inlet 712 that communicates with the ash discharge port 4. The dust is sucked into the dust collection box 71 by suction along the ash discharge port 4, which effectively prevents the dust from being stirred up.
[0021] like Figure 5 As shown, this utility model provides a technical solution for an SCR denitrification device for high-dust flue gas in cement kilns: the spraying mechanism 9 includes a water pump 91, a pumping pipe 92, a collecting pipe 93, two branch pipes 94, several spray pipes 95, and several nozzles 96. The output port of the water pump 91 is fixedly connected to one end of the pumping pipe 92, and the input pipe of the water pump 91 is fixedly connected to the middle of the collecting pipe 93. The upper ends of the two branch pipes 94 are respectively fixedly connected to the left and right ends of the collecting pipe 93. One end of each of the several spray pipes 95 is equidistantly arrayed and fixedly connected to the two branch pipes. The inner wall of the flue 94 has several spray pipes 95 on the left and right sides. The other end of each pipe extends into the interior of the flue 1 and is fixedly connected to the other end of the spray pipe 95. The other end of the water pump 92 is fixedly connected to one end of the reducing agent tank 8. The several spray pipes 95 on the left and right sides are staggered. The bottom of the flue 1 has a connecting port 101 that communicates with the liquid collection box 10. The reducing agent is sprayed evenly into the flue by spraying and mixed with the high temperature and high dust flue gas. Under the action of the catalyst, NOx is reduced to N2 and H2O, realizing the denitrification reaction.
[0022] The working principle of this SCR denitrification device applied to high-dust flue gas in cement kilns will be explained in detail below.
[0023] like Figure 1-5As shown, during the cement kiln production process, this device is installed on the exhaust channel of the cement kiln, and reducing agent is injected into the reducing agent tank 8. When the generated high-dust flue gas enters the flue channel 2, the electrostatic generator 33 is started. High-voltage DC is applied between the electrode wire 34 and the metal filter plate 32, forming a strong electric field. When the electric field strength is high enough, the air is ionized, generating a large number of free electrons and ions, forming a corona region. Under the action of the electric field force, the charged dust moves towards the positively charged dust collecting electrode and is finally adsorbed on the surface of the metal filter plate 32. By starting the stepper motor 61 at a timer, the output shaft of the stepper motor 61 drives the lead screw 62 to rotate, causing the sleeve 64 to slide up and down along the slide bar 63, driving the cleaning component 66 to move along the surface of the metal filter plate 32. The bristles 663 brush against the surface of the metal filter plate 32. The adsorbed dust is swept away, and the scraper 662 scrapes off the dust on the surface of the metal filter plate 32. Combined with the start of the vacuum cleaner 74, the suction force generated draws the fallen dust into the dust collection box 71 along the ash discharge port 4. The filtered flue gas enters the flue 1. Combined with the start of the water pump 91, the water pump 91 delivers the reducing agent in the reducing agent tank 8 through the water collection pipe 92 to the two diversion pipes 94 through the water collection pipe 93. Then, it is sprayed out in an atomized form through multiple nozzles 96, which fully mixes with the high temperature and high dust flue gas. Under the action of the catalyst, NOx is reduced to N2 and H2O, realizing the denitrification reaction. After the denitrification technology, the bolts 76 on both sides can be removed, the cover plate 72 can be taken out, the dust in the dust collection box 71 can be cleaned, and the waste liquid in the liquid collection box 10 can be discharged by opening the drain valve pipe 11.
[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A device for denitration of high-dust flue gas of a cement kiln by SCR, comprising a flue (1), characterized in that: The front and rear ends of the flue (1) are respectively fixedly connected to the smoke inlet channel (2). The front smoke inlet channel (2) is equipped with an electrostatic dust removal mechanism (3). The top of the front smoke inlet channel (2) is fixedly connected to the casing (5). The bottom of the front smoke inlet channel (2) near the front side of the electrostatic dust removal mechanism (3) is provided with a vertically penetrating ash discharge port (4). The front smoke inlet channel (2) is equipped with a dust removal mechanism (6) near the front side of the electrostatic dust removal mechanism (3). The top of the outer wall extends into the casing (5). A dust collection assembly (7) is provided at the bottom of the front smoke inlet channel (2). A reducing agent tank (8) is fixedly connected to the top of the rear smoke inlet channel (2). A spraying mechanism (9) is provided at the top of the flue (1). The bottom of the outer wall of the spraying mechanism (9) extends to the left and right sides of the flue (1). A liquid collection box (10) is fixedly connected to the bottom of the flue (1). A drain valve pipe (11) is fixedly connected to the bottom of the left end of the liquid collection box (10).
2. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 1, characterized in that: The electrostatic dust removal mechanism (3) includes an insulating ceramic frame (31), a metal filter plate (32), an electrostatic generator (33), and two electrode wires (34). The outer wall of the metal filter plate (32) is fixedly connected to the inside of the metal filter plate (32). The surface of the metal filter plate (32) is honeycomb-shaped. The ends of the two electrode wires (34) are electrically connected to the connection end at the bottom of the electrostatic generator (33). The tails of the two electrode wires (34) penetrate to the top of the metal filter plate (32) and are electrically connected to each other. The outer wall of the insulating ceramic frame (31) is fixedly connected to the inner wall of the smoke inlet channel (2). The outer side of the electrostatic generator (33) is fixedly connected to the inner wall of the housing (5).
3. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 1, characterized in that: The dust removal mechanism (6) includes a stepper motor (61), a lead screw (62), a slide rod (63), two sleeves (64), a connecting plate (65), a cleaning assembly (66), and a U-shaped protective shell (67). The output shaft of the stepper motor (61) is fixedly connected to the upper end of the lead screw (62). The opposite surfaces of the two sleeves (64) are fixedly connected to the left and right ends of the connecting plate (65). The outer wall of the lead screw (62) is threadedly connected to the inner wall of the right sleeve (64). The outer wall of the slide rod (63) is slidably connected to the inside of the left sleeve (64). The outside of the cleaning assembly (66) is located at the rear end of the connecting plate (65). The inside of the U-shaped protective shell (67) is located on the outer wall of the lead screw (62).
4. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 3, characterized in that: The top of the stepper motor (61) is fixedly connected to the inside of the housing (5), the lower end of the lead screw (62) is rotatably connected to the bottom of the inner wall of the smoke inlet channel (2), the upper and lower ends of the slide rod (63) are fixedly connected to the inner wall of the smoke inlet channel (2) respectively, and the bottom of the U-shaped protective shell (67) is fixedly connected to the inner wall of the smoke inlet channel (2).
5. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 3, characterized in that: The cleaning assembly (66) includes a cleaning plate (661), a scraper (662), several sets of bristles (663), and two connecting blocks (664). One end of the scraper (662) is fixedly connected to the top of the rear end of the cleaning plate (661). One end of the several sets of bristles (663) is fixedly connected to the bottom of the rear end of the cleaning plate (661) at equal intervals. The rear ends of the two connecting blocks (664) are fixedly connected to the left and right sides of the front end of the cleaning plate (661). The front ends of the two connecting blocks (664) are fixedly connected to the rear end of the connecting plate (65). The outer walls of the scraper (662) and the bristles (663) overlap with the surface of the metal filter plate (32).
6. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 1, characterized in that: The dust collection assembly (7) includes a dust collection box (71), a cover plate (72), a sealing gasket (73), a vacuum cleaner (74), two mounting plates (75), and two bolts (76). The bottom of the dust collection box (71) is fixedly connected to the bottom of the smoke inlet channel (2). One end of the cover plate (72) is fixedly connected to the outer surface of the sealing gasket (73). The outer wall of the sealing gasket (73) engages with the inside of the dust collection box (71). The outside of the vacuum cleaner (74) is fixedly connected to the back of the dust collection box (71). The output pipe of the vacuum cleaner (74) passes through the inner wall of the dust collection box (71) and is fixedly connected to it. The two mounting plates (75) are... One end is fixedly connected to the left and right sides of the rear end of the cover plate (72) near the sealing gasket (73). The middle of the two mounting plates (75) is provided with a through hole (750). The front side of the left and right ends of the dust collection box (71) is provided with a threaded hole (710). The outer wall of the bolt (76) passes through the through hole (750) and is threaded to the inner wall of the threaded hole (710). The top of the left and right ends of the dust collection box (71) is provided with an exhaust port (711). The inner wall of the two exhaust ports (711) is fixedly connected with a filter screen. The top of the dust collection box (71) is provided with a dust inlet (712) that communicates with the ash discharge port (4).
7. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 1, characterized in that: The spraying mechanism (9) includes a water pump (91), a water pumping pipe (92), a water collecting pipe (93), two branch pipes (94), several spray pipes (95), and several nozzles (96). The output port of the water pump (91) is fixedly connected to one end of the water pumping pipe (92). The input pipe of the water pump (91) is fixedly connected to the middle of the water collecting pipe (93). The upper ends of the two branch pipes (94) are fixedly connected to the left and right ends of the water collecting pipe (93), respectively. One end of the several spray pipes (95) is fixedly connected to the inner wall of the two branch pipes (94) in an equidistant array. The other end of the outer wall of the several spray pipes (95) on the left and right sides penetrates into the interior of the flue (1) and is fixedly connected to each other. The connecting end of the nozzle (96) is fixedly connected to the other end of the spray pipe (95).
8. The device for denitration of high-dust flue gas of a cement kiln by SCR according to claim 7, characterized in that: The other end of the water pumping pipe (92) is fixedly connected with one end of the reducing agent tank (8), and the left and right several spray pipes (95) are staggered, and the bottom of the flue (1) is provided with a communication port (101) penetrating through the liquid collecting box (10).