Cement SCR (Selective Catalytic Reduction) denitration device

Abstract

The utility model provides a cement SCR (Selective Catalytic Reduction) denitration device, which relates to the field of cement SCR denitration equipment and comprises an SCR denitration component, a denitration tower, a mixer communicated with the denitration tower, a connecting pipe communicated with the mixer, a catalyst reaction layer for catalytic reaction, an ammonia spraying grid for spraying ammonia water and a guide plate for guiding flue gas, the particle intercepting assembly comprises a filtering assembly used for filtering the smoke, a cleaning assembly used for cleaning smoke particles and a collecting assembly used for collecting the smoke particles, and the filtering assembly comprises a filtering box and a smoke inlet pipe which is communicated with an inner cavity of the filtering box and located at the lower end of the surface of the filtering box; particles in smoke can be effectively intercepted and cleaned through the particle intercepting assembly, the filtering assembly filters the smoke through a filtering net, the cleaning assembly drives a brush plate to rotate through a first motor and a first speed reducer, the filtering net is cleaned, the filtering net is prevented from being blocked, and the filtering effect and stable operation of the device are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of cement SCR denitrification equipment, specifically a cement SCR denitrification device. Background Technology

[0002] The cement SCR denitrification unit is a flue gas treatment device used in the cement industry. It mainly consists of an SCR reactor, an ammonia injection device, a catalyst, and other auxiliary devices. Its core function is to reduce the emission of nitrogen oxides generated during cement production in order to meet environmental protection requirements.

[0003] According to patent number CN212283555U, a SCR denitrification device for cement kiln flue gas is disclosed. The outlet of the kiln flue is connected to a dust removal flue and a straight flue. The dust removal flue is connected to the inlet of a high-temperature filter dust collector through a dust removal fan. The outlet of the high-temperature filter dust collector and the straight flue are connected to the inlet of the denitrification main flue. The denitrification main flue is connected to each parallel SCR denitrification reactor through a flue gas inlet branch. Each denitrification reactor is provided with multiple denitrification catalyst layers from top to bottom. Each flue gas inlet branch is provided with an ammonia injection grid. The upper end of each flue gas inlet branch is connected to the upper inlet of the corresponding denitrification reactor through a turning elbow. A filter screen is provided above the top denitrification catalyst layer. Ash collection hoppers for receiving ash discharged from the filter screen are provided on the outer side of the two side walls of the filter screen. An acoustic soot blower is provided on the two side walls above the filter screen. The device can treat nitrogen oxides in high-dust cement kiln flue gas to below the emission limit.

[0004] Existing technologies have effectively solved the problem of catalyst blockage caused by dust in reaction towers, and have the advantages of reducing catalyst blockage and improving flue gas treatment efficiency. However, the dust in cement kiln flue gas still contains large particles. When these large dust particles flow through the SCR denitrification device, they will cause wear on the denitrification catalyst layer, affecting the service life of the catalyst and the denitrification efficiency. In addition, large dust particles may also block the ammonia injection grid and flue gas inlet branch pipe, resulting in uneven ammonia distribution and further affecting the denitrification effect.

[0005] In summary, this utility model provides a cement SCR denitrification device to solve the above problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A cement SCR denitrification device includes an SCR denitrification assembly comprising a denitrification tower, a mixer connected to the denitrification tower, a connecting pipe connected to the mixer, a catalyst reaction layer for catalytic reaction, an ammonia injection grid for ammonia injection, a guide plate for flue gas flow, and an exhaust pipe for flue gas emission. A particulate interception assembly includes a filter assembly for flue gas filtration, a cleaning assembly for cleaning flue gas particles, and a collection assembly for collecting flue gas particles. The filter assembly includes a filter box, an inlet pipe connected to the inner cavity of the filter box and located at the lower end of the filter box surface, a filter screen fixed to the upper end of the inner cavity of the filter box, and a conical hopper fixed to the bottom of the filter box. The end of the connecting pipe away from the mixer is connected to the outlet of the filter box. The cleaning assembly includes a first motor, a first reducer fixed to the top of the filter box, brush plates located at the top and bottom of the filter screen, a drive shaft for transmission, and a connecting rod for connecting the two brush plates.

[0008] Furthermore, in this utility model, the first motor is fixed to the top of the filter box, the output shaft of the first motor is connected to the first reducer, one end of the drive shaft is fixedly connected to the upper brush plate, and the other end of the drive shaft extends through to the outside of the filter box and is connected to the output shaft of the first reducer.

[0009] Furthermore, in this utility model, one end of the connecting rod is fixedly connected to the lower brush plate, and the other end of the connecting rod passes through the filter screen and is fixedly connected to the upper brush plate.

[0010] Furthermore, in this utility model, the catalyst reaction layer is provided in three sets, and is fixed in the inner cavity of the denitrification tower from top to bottom. The ammonia injection grid is installed in the inner cavity of the mixer and is connected to the external ammonia water delivery pump. The guide plate is fixed at the upper end of the inner cavity of the denitrification tower. The flue pipe is located at the lower end of the surface of the denitrification tower and is connected to the inner cavity of the denitrification tower.

[0011] Furthermore, in this utility model, the collecting assembly includes a conveying pipe, a main shaft mounted in the inner cavity of the conveying pipe via bearings, a spiral blade fixed to the surface of the main shaft, a discharge pipe communicating with the conveying pipe, a discharge valve mounted on the surface of the discharge pipe, and a second motor and a second reducer fixed to the conveying pipe.

[0012] Furthermore, in this utility model, the output shaft of the second motor is connected to the input shaft of the second reducer, the output shaft of the second reducer passes through the inner cavity of the conveying pipe and is connected to the main shaft, the discharge pipe is located at the bottom of the conveying pipe, the conveying pipe is fixed to the bottom of the conical hopper and communicates with the inner cavity of the conical hopper.

[0013] Beneficial effects: This utility model has the following beneficial effects:

[0014] This invention effectively intercepts and cleans particles in flue gas through a particle interception component, a filtration component filters flue gas through a filter screen, and a cleaning component uses a first motor and a first reducer to drive a brush plate to rotate and clean the filter screen, preventing clogging and ensuring filtration effect and stable operation of the device. The collection component can collect and process the intercepted particles, and the spiral blades, driven by the main shaft, transport the particles to the discharge pipe. The discharge valve can control the discharge, facilitating centralized processing of the collected particles. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection state structure of the particle interception component of this utility model;

[0017] Figure 3 This is a schematic diagram of the connection structure between the filter component and the collection component of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection state structure of the cleaning component of this utility model;

[0019] Figure 5 This is a front view cross-sectional structural diagram of the SCR denitrification component of this utility model.

[0020] In the picture:

[0021] 100. SCR denitrification assembly; 110. Denitrification tower; 120. Mixer; 130. Connecting pipe; 140. Catalyst reaction layer; 150. Ammonia injection grid; 160. Baffle plate; 170. Exhaust pipe; 200. Particle interception assembly; 210. Filter assembly; 211. Filter box; 212. Inlet pipe; 213. Filter screen; 214. Conical hopper; 220. Cleaning assembly; 221. First motor; 222. First reducer; 223. Brush plate; 224. Drive shaft; 225. Connecting rod; 230. Collection assembly; 231. Conveying pipe; 232. Main shaft; 233. Spiral blade; 234. Discharge pipe; 235. Discharge valve; 236. Second motor; 237. Second reducer. Detailed Implementation

[0022] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0023] Example 1

[0024] like Figure 1-5 The image shows the first embodiment of this utility model, which provides a cement SCR denitrification device, including an SCR denitrification assembly 100, comprising a denitrification tower 110, a mixer 120 connected to the denitrification tower 110, a connecting pipe 130 connected to the mixer 120, a catalyst reaction layer 140 for catalytic reaction, an ammonia injection grid 150 for ammonia injection, a guide plate 160 for flue gas guidance, and an exhaust pipe 170 for flue gas emission; and a particulate interception assembly 200, including a filter assembly 210 for flue gas filtration, a cleaning assembly 220 for cleaning flue gas particles, and a collection assembly 230 for collecting flue gas particles. The filter assembly 210 includes a filter box 211, a smoke inlet pipe 212 communicating with the inner cavity of the filter box 211 and located at the lower end of the surface of the filter box 211, a filter screen 213 fixed to the upper end of the inner cavity of the filter box 211, and a conical hopper 214 fixed to the bottom of the filter box 211. The end of the connecting pipe 130 away from the mixer 120 is connected to the outlet of the filter box 211. The cleaning assembly 220 includes a first motor 221, a first reducer 222 fixed to the top of the filter box 211, brush plates 223 located at the top and bottom of the filter screen 213, a drive shaft 224 for transmission, and a connecting rod 225 for connecting the two brush plates 223.

[0025] like Figure 1-5As shown, the filter assembly 210 consists of a filter box 211, a flue gas inlet pipe 212, a filter screen 213, and a conical hopper 214 that work together. Cement kiln flue gas enters the filter box 211 through the flue gas inlet pipe 212. The filter screen 213 effectively intercepts large dust particles, preventing them from continuing to enter the subsequent SCR denitrification assembly 100 with the flue gas. Most of the large dust particles are blocked on the filter screen 213 and fall into the conical hopper 214 under gravity, initially reducing the amount of large dust particles entering the denitrification device, lowering the risk of wear on the catalyst reaction layer 140, and reducing the possibility of clogging the ammonia injection grille 150 and the flue gas inlet branch pipe. The cleaning assembly 220 includes the first motor 221, the first reducer 222, the brush plate 223, the drive shaft 224, and the connecting rod 224. Working in tandem, the first motor 221 drives the transmission shaft 224 to rotate via the first reducer 222, thereby causing the brush plate 223 to clean the top and bottom of the filter screen 213. This promptly removes dust adhering to the filter screen 213, preventing clogging and ensuring that the filter assembly 210 continuously and stably intercepts large dust particles, ensuring normal flue gas flow and maintaining the normal operation of the entire denitrification device. The cleaned particulate dust can be discharged through the collection assembly 230. After being treated by the particulate interception assembly 200, the flue gas has a significantly reduced content of large dust particles. After entering the SCR denitrification assembly 100, the wear of the catalyst reaction layer 140 is significantly improved, its service life is extended, and the denitrification efficiency remains at a high level. At the same time, the ammonia injection grille 150 and the flue gas inlet branch pipe are not easily blocked, and the ammonia gas can be evenly distributed, thus ensuring a good denitrification effect.

[0026] Example 2

[0027] Reference Figure 2 , 4 5, is the second embodiment of this utility model, which is based on the previous embodiment.

[0028] In this embodiment, the first motor 221 is fixed to the top of the filter box 211, the output shaft of the first motor 221 is connected to the first reducer 222, one end of the transmission shaft 224 is fixedly connected to the upper brush plate 223, and the other end of the transmission shaft 224 extends through to the outside of the filter box 211 and is connected to the output shaft of the first reducer 222.

[0029] One end of the connecting rod 225 is fixedly connected to the lower brush plate 223, and the other end of the connecting rod 225 passes through the filter screen 213 and is fixedly connected to the upper brush plate 223.

[0030] The catalyst reaction layer 140 is provided in three sets and is fixed to the inner cavity of the denitrification tower 110 from top to bottom. The ammonia injection grid 150 is installed in the inner cavity of the mixer 120 and is connected to the external ammonia water delivery pump. The guide plate 160 is fixed at the upper end of the inner cavity of the denitrification tower 110. The flue pipe 170 is located at the lower end of the surface of the denitrification tower 110 and is connected to the inner cavity of the denitrification tower 110.

[0031] like Figure 2 , 4 As shown in Figure 5, the first motor 221, first reducer 222, brush plate 223, drive shaft 224, and connecting rod 225 in the cleaning assembly 220 work together. The first motor 221 drives the drive shaft 224 to rotate through the first reducer 222, thereby causing the brush plate 223 to clean the top and bottom of the filter screen 213. This can promptly remove dust adhering to the filter screen 213, prevent the filter screen 213 from clogging, ensure that the filter assembly 210 continuously and stably intercepts large dust particles, ensures the normal flow of flue gas, and maintains the normal operation of the entire denitrification device. After being filtered by the particulate interception component 200, the flue gas enters the mixer 120 through the connecting pipe 130. The ammonia injection grid 150 injects ammonia water into the mixer 120, so that the ammonia water and the flue gas are fully mixed. The mixed flue gas enters the denitrification tower 110 and passes through three sets of catalyst reaction layers 140 in sequence. Under the action of the catalyst, ammonia reacts with nitrogen oxides in the flue gas to convert nitrogen oxides into nitrogen and water. A soot blowing device can be installed above the catalyst reaction layer 140 to clean the catalyst reaction layer 140 regularly and prevent the catalyst reaction layer 140 from becoming blocked.

[0032] Example 3

[0033] Reference Figure 1-3 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0034] In this embodiment, the collecting component 230 includes a conveying pipe 231, a main shaft 232 mounted on the inner cavity of the conveying pipe 231 via bearings, a spiral blade 233 fixed on the surface of the main shaft 232, a discharge pipe 234 communicating with the conveying pipe 231, a discharge valve 235 mounted on the surface of the discharge pipe 234, and a second motor 236 and a second reducer 237 fixed to the conveying pipe 231.

[0035] The output shaft of the second motor 236 is connected to the input shaft of the second reducer 237. The output shaft of the second reducer 237 passes through the inner cavity of the conveying pipe 231 and is connected to the main shaft 232. The discharge pipe 234 is located at the bottom of the conveying pipe 231. The conveying pipe 231 is fixed to the bottom of the conical hopper 214 and communicates with the inner cavity of the conical hopper 214.

[0036] like Figure 1-3As shown, the conveying pipe 231, main shaft 232, spiral blade 233, discharge pipe 234, discharge valve 235, second motor 236, and second reducer 237 in the collection assembly 230 work together. Large dust particles falling into the conical hopper 214 enter the conveying pipe 231. The second motor 236 drives the main shaft 232 and spiral blade 233 to rotate through the second reducer 237, conveying the dust to the discharge pipe 234. By controlling the opening and closing of the discharge valve 235, the collected dust can be discharged periodically, preventing dust from accumulating in the device and further reducing the risk of large dust particles damaging the denitrification device.

[0037] In operation, flue gas enters the filter box 211 through the inlet pipe 212. The filter screen 213 filters the particles in the flue gas. The filtered particles fall into the conical hopper 214 under gravity. The filtered flue gas then enters the mixer 120 of the SCR denitrification assembly 100 through the connecting pipe 130. The first motor 221 starts, and its output shaft drives the first reducer 222 to rotate. The output shaft of the first reducer 222 drives the transmission shaft 224 to rotate. Since the transmission shaft 224 is fixedly connected to the upper brush plate 223, and the upper and lower parts are connected... The two brush plates 223 are connected by the connecting rod 225, so the two brush plates 223 will clean the top and bottom of the filter screen 213 at the same time to prevent the filter screen 213 from clogging. The particles falling into the conical hopper 214 enter the conveying pipe 231. The second motor 236 starts, and its output shaft drives the second reducer 237 to run. The output shaft of the second reducer 237 drives the main shaft 232 to rotate. The spiral blades 233 on the surface of the main shaft 232 convey the particles to the discharge pipe 234. Open the discharge valve 235 to discharge the particles.

[0038] After being filtered by the particulate interception component 200, the flue gas enters the mixer 120. The ammonia injection grille 150 injects ammonia water supplied by the external ammonia water delivery pump into the mixer 120, so that the ammonia water and the flue gas are fully mixed. The mixed flue gas enters the denitrification tower 110. Three sets of catalyst reaction layers 140 are set in the denitrification tower 110. The ammonia water and the flue gas undergo a denitrification reaction under the catalytic action of the catalyst reaction layers 140, removing nitrogen oxides from the flue gas. The guide plate 160 is fixed at the upper end of the inner cavity of the denitrification tower 110, which plays the role of guiding the flue gas, so that the flue gas passes through the catalyst reaction layers 140 more evenly. Finally, the denitrified flue gas is discharged through the exhaust pipe 170.

[0039] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A cement SCR denitrification device, characterized in that: include, SCR denitrification assembly (100) includes a denitrification tower (110), a mixer (120) connected to the denitrification tower (110), a connecting pipe (130) connected to the mixer (120), a catalyst reaction layer (140) for catalytic reaction, an ammonia injection grid (150) for ammonia injection, a guide plate (160) for flue gas flow, and a flue gas exhaust pipe (170) for flue gas emission. The particulate interception assembly (200) includes a filter assembly (210) for filtering flue gas, a cleaning assembly (220) for cleaning flue gas particles, and a collection assembly (230) for collecting flue gas particles. The filter assembly (210) includes a filter box (211), a smoke inlet pipe (212) communicating with the inner cavity of the filter box (211) and located at the lower end of the surface of the filter box (211), a filter screen (213) fixed to the upper end of the inner cavity of the filter box (211), and a conical hopper (214) fixed to the bottom of the filter box (211). The end of the connecting pipe (130) away from the mixer (120) is connected to the outlet of the filter box (211). The cleaning assembly (220) includes a first motor (221), a first reducer (222) fixed to the top of the filter box (211), brush plates (223) located at the top and bottom of the filter screen (213), a drive shaft (224) for transmission, and a connecting rod (225) for connecting the two brush plates (223).

2. The cement SCR denitrification device as described in claim 1, characterized in that: The first motor (221) is fixed to the top of the filter box (211). The output shaft of the first motor (221) is connected to the first reducer (222). One end of the drive shaft (224) is fixedly connected to the brush plate (223) at the upper end. The other end of the drive shaft (224) extends through to the outside of the filter box (211) and is connected to the output shaft of the first reducer (222).

3. The cement SCR denitrification device as described in claim 1, characterized in that: One end of the connecting rod (225) is fixedly connected to the lower brush plate (223), and the other end of the connecting rod (225) passes through the filter screen (213) and is fixedly connected to the upper brush plate (223).

4. The cement SCR denitrification device as described in claim 1, characterized in that: The catalyst reaction layer (140) is provided in three sets and is fixed in the inner cavity of the denitrification tower (110) from top to bottom. The ammonia injection grid (150) is installed in the inner cavity of the mixer (120) and connected to the external ammonia water delivery pump. The guide plate (160) is fixed at the upper end of the inner cavity of the denitrification tower (110). The exhaust pipe (170) is located at the lower end of the surface of the denitrification tower (110) and communicates with the inner cavity of the denitrification tower (110).

5. The cement SCR denitrification device as described in claim 1, characterized in that: The collecting assembly (230) includes a conveying pipe (231), a main shaft (232) mounted on the inner cavity of the conveying pipe (231) via bearings, a spiral blade (233) fixed on the surface of the main shaft (232), a discharge pipe (234) communicating with the conveying pipe (231), a discharge valve (235) mounted on the surface of the discharge pipe (234), and a second motor (236) and a second reducer (237) fixed to the conveying pipe (231).

6. The cement SCR denitrification device as described in claim 5, characterized in that: The output shaft of the second motor (236) is connected to the input shaft of the second reducer (237). The output shaft of the second reducer (237) passes through the inner cavity of the conveying pipe (231) and is connected to the main shaft (232). The discharge pipe (234) is located at the bottom of the conveying pipe (231). The conveying pipe (231) is fixed to the bottom of the conical bucket (214) and communicates with the inner cavity of the conical bucket (214).

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