Cement kiln tail flue gas SCR (selective catalytic reduction) denitration and ash removal device with scraper

Abstract

The utility model discloses a cement kiln tail flue gas SCR denitration deashing device with scrapers, which comprises a gas inlet pipe, a driving mechanism, a blowing mechanism and a plurality of scrapers, the driving mechanism is provided with the blowing mechanism, the blowing mechanism comprises a blowing main pipe and a plurality of blowing assemblies, the blowing main pipe is communicated with the blowing assemblies, and the blowing assemblies are communicated with the blowing main pipe. The air inlet pipe is communicated with the blowing main pipe, each blowing assembly is provided with a scraping plate, each blowing assembly comprises a plurality of communicating mechanisms, two blowing branch pipes and a plurality of spray heads, each blowing branch pipe is provided with a communicating mechanism communicated with the blowing branch pipe, the lower end of each blowing branch pipe is provided with a row of spray heads, and the spray heads are communicated with the communicating mechanisms. Compared with the prior art, the ash removal device has the advantages that the ash removal effect can be improved, meanwhile, the phenomena of hardening and accumulation on the surface of a catalyst can be effectively avoided, and long-term stable operation of SCR denitration at the tail of the cement kiln is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas treatment, and in particular to a SCR denitrification and ash removal device for cement kiln tail flue gas with a scraper. Background Technology

[0002] In the cement industry, high-temperature, high-dust SCR denitrification technology is generally used for kiln tail gas. The SCR denitrification reactor is located between the C1 outlet and the waste heat boiler inlet. The cement kiln tail gas contains a large amount of raw material dust, with a concentration of 80-120 g / m3. The dust has the characteristics of small particle size, low density and strong adhesion, which makes it very easy to adhere to the surface of the SCR denitrification catalyst, thereby causing catalyst blockage, poisoning or even failure.

[0003] To prevent catalyst deactivation, a rake-type soot blower is generally used for cleaning. Since there is not enough steam at the tail of the cement kiln, heated compressed air is generally used for purging. In actual use, due to insufficient compressed air pressure, the effect of light blowing on the catalyst is not good, and the catalyst surface is still prone to ash accumulation, and even serious caking occurs. The main reasons are that some nozzles are blocked, the compressed air pressure is insufficient, and the humidity of the compressed air is high. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a cement kiln tail flue gas SCR denitrification and ash removal device with scraper, which can improve the ash removal effect and effectively avoid the phenomenon of caking and accumulation on the catalyst surface, thus ensuring the long-term stable operation of cement kiln tail SCR denitrification.

[0005] To achieve the above objectives, this utility model proposes a cement kiln tail flue gas SCR denitrification and ash removal device with scrapers, including an air inlet pipe, a drive mechanism, a jetting mechanism, and several scrapers. The drive mechanism is equipped with a jetting mechanism, which includes a jetting main pipe and several jetting components. The jetting main pipe and the jetting components are all connected. The air inlet pipe is connected to the jetting main pipe. Each jetting component is equipped with a scraper. Each jetting component includes several connecting mechanisms, two jetting branch pipes, and several nozzles. Each jetting branch pipe is equipped with a connecting mechanism connected to it. The lower end of each jetting branch pipe is equipped with nozzles arranged in a row, and the nozzles on the two jetting branch pipes are staggered.

[0006] Preferably, the main jet pipe includes a main pipe I and a main pipe II. The connecting mechanism on the front jet branch pipe is connected to the main pipe I through a connecting pipe, and the connecting mechanism on the rear jet branch pipe is connected to the main pipe II through a connecting pipe. The output end of the air inlet pipe is equipped with an electric three-way valve, and the two output ends of the electric three-way valve are connected to the main pipe I and the main pipe II respectively through flexible hoses.

[0007] Preferably, the spray assembly further includes a housing, the upper end of which is provided with a connecting mechanism, the spray branch pipe is located inside the housing, the lower end of which is provided with through holes that correspond one-to-one with and cooperate with the nozzles, the housing is provided with two closing mechanisms for closing the front and rear rows of through holes respectively, and the rear end of the housing is provided with a scraper.

[0008] Preferably, the sealing mechanism includes several seats, several slide rods, several springs III, several connecting rods and an L-shaped sealing plate. Each seat is provided with a slide rod, and the rear end of each slide rod is provided with an L-shaped sealing plate. Each slide rod between the L-shaped sealing plate and the seat is fitted with a spring III. The L-shaped sealing plate is hinged to the corresponding jetting branch pipe through a connecting rod.

[0009] Preferably, the communication mechanism includes a piston sleeve, a piston, a shaft tube, an upper support, a spring I, a sealing head, a limiting head, a lower support, and a spring II. The piston sleeve contains the upper support and the lower support. A sliding shaft passes through the upper support. The lower end of the sliding shaft is provided with a sealing head that closes the upper end of the shaft tube. The upper end of the sliding shaft is provided with a limiting head. Spring I is sleeved on the sliding shaft between the sealing head and the upper support. A shaft tube passes through the lower support. A piston that cooperates with the piston sleeve is sleeved on the upper end of the shaft tube. Spring II is sleeved on the shaft tube between the piston and the lower support.

[0010] Preferably, the drive mechanism includes two linear guides, two L-shaped guide tubes, two flexible shafts, a ball screw, two screw nuts, and a drive motor. Each guide tube has a flexible shaft that mates with it. Both ends of the flexible shaft are connected to the slide of the corresponding linear guide and the screw nut, respectively, via connectors. Both sides of the L-shaped guide tube have clearance grooves for sliding of the corresponding connectors. The ball screw has two threaded sections, each with a screw nut that mates with it. The drive motor drives the ball screw to rotate.

[0011] The beneficial effects of this utility model are as follows: 1. The scraper can scrape a large amount of ash from the catalyst surface into the catalyst pores, which is then carried away by the blowing air and flue gas, effectively improving the ash removal effect; 2. If the accumulated ash is not blown off by the blowing, the scraper can remove the accumulated ash, thereby avoiding the catalyst from accumulating ash on the catalyst surface for a long time, which would lead to accelerated catalyst failure. At the same time, it can effectively prevent the ash from caking due to long-term accumulation, which would affect the normal use of the denitrification system; 3. The traditional row of nozzles on the blowing branch pipe is divided into two rows and the nozzles are staggered. In this way, the two rows of nozzles can work alternately, effectively reducing the number of nozzles working, thereby greatly increasing the blowing force of the nozzles and improving the cleaning effect.

[0012] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a cement kiln tail flue gas SCR denitrification and ash removal device with scraper according to the present invention.

[0014] Figure 2 This is a partial side view of the jetting mechanism.

[0015] In the diagram: 1-Intake pipe, 2-Drive mechanism, 3-Puffing mechanism, 4-Scraper, 21-Linear guide rail, 22-L-shaped guide tube, 23-Flexible shaft, 24-Ball screw, 25-Screw nut, 26-Drive motor, 27-Allowing groove, 28-Connector, 31-Puffing main pipe, 32-Puffing assembly, 311-Main pipe I, 312-Main pipe II, 313-Connecting pipe, 314-Electric three-way valve, 315-Hose, 320-Sealing mechanism, 321-Housing. 322-Connecting mechanism, 323-Puffing branch pipe, 324-Nozzle, 325-Through hole, 3201-Seat body, 3202-Slide rod, 3203-Spring III, 3204-Connecting rod, 3205-L-shaped sealing plate, 3220-Sliding shaft, 3221-Piston sleeve, 3222-Piston, 3223-Shaft tube, 3224-Upper support, 3225-Spring I, 3226-Sealing head, 3227-Limiting head, 3228-Lower support, 3229-Spring II. Detailed Implementation

[0016] See Figure 1 , Figure 2 This utility model discloses a cement kiln tail gas SCR denitrification and ash removal device with scrapers, comprising an air inlet pipe 1, a drive mechanism 2, a jetting mechanism 3, and several scrapers 4. The drive mechanism 2 is equipped with the jetting mechanism 3, which includes a jetting main pipe 31 and several jetting components 32. The jetting main pipe 31 and the jetting components 32 are all connected. The air inlet pipe 1 is connected to the jetting main pipe 31. Each jetting component 32 is equipped with a scraper 4. Each jetting component 32 includes several connecting mechanisms 322, two jetting branch pipes 323, and several nozzles 324. Each jetting branch pipe 323 is equipped with a connecting mechanism 322 connected to it. The lower end of each jetting branch pipe 323 is equipped with a row of nozzles 324, and the nozzles 324 on the two jetting branch pipes 323 are staggered.

[0017] The main jet pipe 31 includes a main pipe I311 and a main pipe II312. The connecting mechanism 322 on the front jet branch pipe 323 is connected to the main pipe I311 through a connecting pipe 313. The connecting mechanism 322 on the rear jet branch pipe 323 is connected to the main pipe II312 through a connecting pipe 313. The output end of the air inlet pipe 1 is equipped with an electric three-way valve 314. The two output ends of the electric three-way valve 314 are connected to the main pipe I311 and the main pipe II312 respectively through a flexible hose 315.

[0018] The spray assembly 32 also includes a housing 321. The upper end of the housing 321 is provided with a connecting mechanism 322. The spray branch pipe 323 is located inside the housing 321. The lower end of the housing 321 is provided with through holes 325 that correspond one-to-one with and cooperate with the nozzles 324. The housing 321 is provided with two closing mechanisms 320 for closing the through holes 325 in the front and rear rows respectively. The rear end of the housing 321 is provided with a scraper 4.

[0019] The sealing mechanism 320 includes several seats 3201, several slide rods 3202, several springs III 3203, several connecting rods 3204, and an L-shaped sealing plate 3205. Each seat 3201 is provided with a slide rod 3202. The rear end of each slide rod 3202 is provided with an L-shaped sealing plate 3205. Each slide rod 3202 between the L-shaped sealing plate 3205 and the seat 3201 is fitted with a spring III 3203. The L-shaped sealing plate 3205 is hinged to the corresponding jetting branch pipe 323 through the connecting rod 3204.

[0020] The communication mechanism 322 includes a piston sleeve 3221, a piston 3222, a shaft tube 3223, an upper support 3224, a spring I 3225, a sealing head 3226, a limiting head 3227, a lower support 3228, and a spring II 3229. The piston sleeve 3221 is provided with an upper support 3224 and a lower support 3228. A sliding shaft 3220 passes through the upper support 3224. The lower end of the sliding shaft 3220 is provided with a seal that closes the upper end of the shaft tube 3223. The upper end of the sliding shaft 3220 is provided with a limiting head 3227. A spring I 3225 is sleeved on the sliding shaft 3220 between the sealing head 3226 and the upper support 3224. A shaft tube 3223 is passed through the lower support 3228. A piston 3222 that cooperates with the piston sleeve 3221 is sleeved on the upper end of the shaft tube 3223. A spring II 3229 is sleeved on the shaft tube 3223 between the piston 3222 and the lower support 3228.

[0021] The drive mechanism 2 includes two linear guides 21, two L-shaped guide tubes 22, two flexible shaft cores 23, a ball screw 24, two screw nuts 25, and a drive motor 26. Each guide tube 22 is provided with a flexible shaft core 23 that mates with it. Both ends of the flexible shaft core 23 are connected to the slide of the corresponding linear guide 21 and the screw nut 25 respectively through connectors 28. Both sides of the L-shaped guide tube 22 are provided with clearance grooves 27 for sliding of the corresponding connectors 28. The ball screw 24 is provided with two threaded sections, and each threaded section is provided with a screw nut 25 that mates with it. The drive motor 26 drives the ball screw 24 to rotate.

[0022] The working process of this utility model:

[0023] This utility model discloses a cement kiln tail flue gas SCR denitrification and ash removal device with scraper. During operation, the drive motor 26 drives the ball screw 24 to rotate clockwise and then counterclockwise. When rotating clockwise, the ball screw 24 drives the two screw nuts 25 to move in opposite directions. Through the cooperation of the flexible shaft core 23 and the connector 28, the corresponding linear guide rail 21 slides to move. The slide of the linear guide rail 21 drives the jet blowing mechanism 3 and the scraper 4 on it to move backward for ash removal. Then, when rotating counterclockwise, the ball screw 24 drives the two screw nuts 25 to move towards each other. Through the cooperation of the flexible shaft core 23 and the connector 28, the corresponding linear guide rail 21 slides to move. The slide of the linear guide rail 21 drives the jet blowing mechanism 3 and the scraper 4 on it to move forward for ash removal. This device can effectively reduce space occupation and has good adaptability to on-site installation.

[0024] Compressed air passes sequentially through the intake pipe 1, the electric three-way valve 314, the main pipe I 311 and the corresponding connecting pipe 313, the connecting mechanism 322, the injection branch pipe 323 and the nozzle 324, and then blows onto the catalyst. After the injection mechanism 3 has made one round trip, the electric three-way valve 314 is adjusted to allow the compressed air to pass sequentially through the intake pipe 1, the electric three-way valve 314, the main pipe II 312 and the corresponding connecting pipe 313, the connecting mechanism 322, the injection branch pipe 323 and the nozzle 324, and then blows onto the catalyst.

[0025] When compressed air passes through the connecting mechanism 322, the piston 3222, under the action of the compressed air, drives the shaft tube 3223 to move downward and compresses the spring II 3229. The shaft tube 3223 drives the corresponding spray branch tube 323 to move downward. The spray branch tube 323 pushes the L-shaped sealing plate 3205 to release the obstruction of the corresponding through hole 325 through the corresponding connecting rod 3204. While the spray branch tube 323 moves downward, it drives the nozzle 324 on it to move downward and extend out of the through hole 325. During the downward movement of the piston 3222, the sealing head 3226 descends together under the action of the spring I 3225. When the limiting head 3227 is blocked by the upper support 3224, the sealing head 3226 cannot continue to move downward. At this time, the downward moving shaft tube 3223 disengages from the sealing head 3226, and the compressed air enters the shaft tube 3223.

[0026] After soot blowing is completed, the air inlet pipe 1 stops supplying air, and the piston 3222 moves upward under the action of the spring II 3229. The piston 3222 drives the corresponding blowing branch pipe 323 to move upward through the shaft tube 3223. The blowing branch pipe 323 drives the nozzle 324 on it to retract into the housing 321. When the shaft tube 3223 moves upward and presses against the sealing head 3226, the shaft tube 3223 pushes the sealing head 3226 upward and compresses the spring I 3225. At the same time, the blowing branch pipe 323 pulls the connecting rod 3204 upward, and the L-shaped sealing plate 3205 moves above the corresponding through hole 325 under the action of the spring III 3203 to block the through hole 325. In this way, the nozzle 324 is in a closed space, avoiding the sealing failure caused by the nozzle 324 always being in the flue gas.

[0027] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A cement kiln tail flue gas SCR denitrification and ash removal device with scraper, characterized in that: It includes an air intake pipe (1), a drive mechanism (2), a spray mechanism (3) and several scrapers (4). The drive mechanism (2) is equipped with a spray mechanism (3). The spray mechanism (3) includes a main spray pipe (31) and several spray components (32). The main spray pipe (31) and the spray components (32) are connected. The air intake pipe (1) is connected to the main spray pipe (31). Each spray component (32) is equipped with a scraper (4). Each spray component (32) includes several connecting mechanisms (322), two spray branch pipes (323) and several nozzles (324). Each spray branch pipe (323) is equipped with a connecting mechanism (322) connected to it. Each spray branch pipe (323) has nozzles (324) arranged in a row at its lower end. The nozzles (324) on the two spray branch pipes (323) are staggered.

2. The SCR denitrification and ash removal device for cement kiln tail flue gas with scraper as described in claim 1, characterized in that: The main jet pipe (31) includes a main pipe I (311) and a main pipe II (312). The connecting mechanism (322) on the front jet branch pipe (323) is connected to the main pipe I (311) through the connecting pipe (313). The connecting mechanism (322) on the rear jet branch pipe (323) is connected to the main pipe II (312) through the connecting pipe (313). The output end of the air inlet pipe (1) is equipped with an electric three-way valve (314). The two output ends of the electric three-way valve (314) are connected to the main pipe I (311) and the main pipe II (312) respectively through the hose (315).

3. The SCR denitrification and ash removal device for cement kiln tail flue gas with scraper as described in claim 1, characterized in that: The spray assembly (32) also includes a housing (321), the upper end of which is provided with a connecting mechanism (322), the spray branch pipe (323) is located inside the housing (321), the lower end of the housing (321) is provided with through holes (325) that correspond one-to-one with the nozzle (324) and cooperate with it, the housing (321) is provided with two closing mechanisms (320) for closing the front and rear rows of through holes (325) respectively, and the rear end of the housing (321) is provided with a scraper (4).

4. The SCR denitrification and ash removal device for cement kiln tail gas with scraper as described in claim 3, characterized in that: The closing mechanism (320) includes several seats (3201), several slide rods (3202), several springs III (3203), several connecting rods (3204), and an L-shaped closing plate (3205). Each seat (3201) is provided with a slide rod (3202). The rear end of each slide rod (3202) is provided with an L-shaped closing plate (3205). Each slide rod (3202) between the L-shaped closing plate (3205) and the seat (3201) is fitted with a spring III (3203). The L-shaped closing plate (3205) is hinged to the corresponding jetting branch pipe (323) through the connecting rod (3204).

5. The SCR denitrification and ash removal device for cement kiln tail flue gas with scraper as described in claim 1, characterized in that: The communication mechanism (322) includes a piston sleeve (3221), a piston (3222), a shaft tube (3223), an upper support (3224), a spring I (3225), a sealing head (3226), a limiting head (3227), a lower support (3228), and a spring II (3229). The piston sleeve (3221) is provided with an upper support (3224) and a lower support (3228). A sliding shaft (3220) passes through the upper support (3224), and the lower end of the sliding shaft (3220) is provided with a sealing seal that closes the upper end of the shaft tube (3223). The sealing head (3226) has a limiting head (3227) at the upper end of the sliding shaft (3220). A spring I (3225) is sleeved on the sliding shaft (3220) between the sealing head (3226) and the upper support (3224). A shaft tube (3223) is passed through the lower support (3228). A piston (3222) that cooperates with the piston sleeve (3221) is sleeved on the upper end of the shaft tube (3223). A spring II (3229) is sleeved on the shaft tube (3223) between the piston (3222) and the lower support (3228).

6. A cement kiln tail flue gas SCR denitrification and ash removal device with scraper as described in any one of claims 1 to 5, characterized in that: The drive mechanism (2) includes two linear guides (21), two L-shaped guide tubes (22), two flexible shaft cores (23), a ball screw (24), two screw nuts (25), and a drive motor (26). Each guide tube (22) is provided with a flexible shaft core (23) that mates with it. Both ends of the flexible shaft core (23) are connected to the slide of the corresponding linear guide (21) and the screw nut (25) respectively through connectors (28). Both sides of the L-shaped guide tube (22) are provided with clearance grooves (27) that allow the corresponding connectors (28) to slide. The ball screw (24) is provided with two threaded sections, and each threaded section is provided with a screw nut (25) that mates with it. The drive motor (26) drives the ball screw (24) to rotate.

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