Denitration device for cement production

Abstract

The utility model discloses a denitration device for cement production, which comprises a denitration tank, a filtering pretreatment structure is fixedly mounted below the outer surface of the denitration tank, and an efficient denitration device is mounted in the denitration tank. According to the efficient denitration device disclosed by the utility model, the flue gas is in full contact with the denitration agent through the arranged stirring and mixing assembly, the flue gas is uniformly dispersed in the denitration agent, in addition, the denitration agent is sprayed out from the nozzle through the arranged circulating pipe and the arranged liquid pump, the rising flue gas can be further denitrated, and the denitration efficiency is improved. A denitration agent is recycled and fully utilized, a filtering pretreatment structure is installed, flue gas entering a denitration tank can be pre-filtered, when the flue gas is introduced from a gas inlet pipe, the flue gas can be filtered through a filtering plate, abrasion of particle impurities to a follow-up catalyst is reduced, and due to the fact that the flue gas inflows, a rotating shaft and the filtering plate are stirred, and the flue gas is prevented from entering the denitration tank. Furthermore, the filtered particle impurities can be collected in the collecting frame.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a denitration device for cement production. Background Art

[0002] Nitrogen oxides are one of the main pollutants emitted by cement plants, among which the NOx content is relatively high. This pollutant has a serious impact on the atmospheric environment. In order to meet environmental protection requirements, cement plants need to take measures to reduce nitrogen oxide emissions, and denitrification technology is a mainstream way to solve the problem of nitrogen oxide emissions from cement plants. Currently, the main denitrification technologies used in cement plants are selective catalytic reduction (SCR) technology.

[0003] The prior art has a publication number of CN220071151U, and the technical solution disclosed in the patent document is as follows: a cement denitration device. The cement denitration device comprises: a denitration tank; a first baffle, the first baffle is fixedly connected to the bottom of the inner wall of the denitration tank, one side of the first baffle is fixedly connected to a collecting plate, one side of the first baffle is fixedly connected to a filter screen, one side of the first baffle is fixedly connected to a support rod, and the bottom of the support rod is fixedly connected to a gas nozzle near the other end.

[0004] The above technical solution denitrates the flue gas by spraying ammonia water by setting a nozzle in the flue gas flow channel, which requires a large amount of ammonia water to meet the emission standards, resulting in low efficiency in the denitrification process. In addition, the flue gas directly enters the denitrification tank through the air intake pipe, and the mixed particulate impurities wear the catalyst, thereby reducing the denitrification effect. Utility Model Content

[0005] The purpose of the utility model is to provide a denitration device for cement production to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: a denitration device for cement production, comprising a denitration tank, a filtering pretreatment structure is fixedly installed below the outer surface of the denitration tank, and a high-efficiency denitration device is installed inside the denitration tank.

[0007] The filtering pretreatment structure includes a folded tube, which passes through the outer wall of the denitrification tank, with one side located inside the denitrification tank, and the other side of the folded tube is fixedly connected to a filter box, the air inlet end of the filter box is fixedly connected to an air inlet pipe, and a filter assembly is rotatably installed inside the filter box.

[0008] The high-efficiency denitration device comprises a stirring and mixing component, which is installed inside a denitration tank, and a spray component is fixedly installed on the inner wall above the denitration tank.

[0009] As a further optimization of this technical solution, a liquid inlet pipe is provided on the outer wall above the denitration tank, a liquid discharge pipe is provided on the outer wall below the denitration tank, an inclined circular plate is provided on the bottom side inside the denitration tank, an air outlet pipe is provided on the top side of the denitration tank, and a suction fan is installed in the air outlet pipe.

[0010] As a further optimization of this technical solution, the filtering assembly includes a rotating shaft, and the rotating shaft is arranged above the inside of the filtering box through a bearing, and filtering plates are arranged on the outer wall of the rotating shaft in a circumferential arrangement.

[0011] In the above technical solution, when the flue gas is introduced through the air inlet pipe, the flue gas can be filtered by the filtering plates, reducing the abrasion of the subsequent catalyst by particulate impurities.

[0012] As a further optimization of this technical solution, a collection box is slidably arranged inside the lower part of the filtering box and is located below the filtering plates.

[0013] In the above technical solution, due to the influx of the flue gas, the rotating shaft and the filtering plates are stirred, and thus the filtered particulate impurities can be collected in the collection box, which is convenient for cleaning.

[0014] As a further optimization of this technical solution, the stirring and mixing assembly includes a supporting circular plate, the supporting circular plate is arranged on the inner wall above the denitration tank, a motor is installed in the middle of the supporting circular plate, the output end of the motor passes through the supporting circular plate and is fixedly connected to a rotating rod, the rotating rod extends to the lower part inside the denitration tank, and stirring paddles are arranged on the outer wall of the lower part of the rotating rod in a circumferential arrangement.

[0015] In the above technical solution, through the arranged stirring and mixing assembly, the flue gas is in full contact with the denitration medicine, and the flue gas is evenly dispersed in the denitration medicine, improving the denitration efficiency.

[0016] As a further optimization of this technical solution, the spraying assembly includes an annular liquid storage box, the annular liquid storage box is arranged on the inner wall of the denitration tank and is located below the supporting circular plate, nozzles are evenly arranged at equal intervals at the liquid outlet on the inner side of the annular liquid storage box, a circulating pipe is fixedly connected to the liquid inlet of the annular liquid storage box, and the circulating pipe passes through the denitration tank and turns back to be connected to the lower part of the denitration tank, and a liquid pump is installed on the circulating pipe.

[0017] In the above technical solution, through the arranged circulating pipe and liquid pump, the denitration medicine is sprayed out from the nozzles, which can further denitrate the rising flue gas, and the denitration medicine can be recycled and fully utilized, thus saving the denitration medicine.

[0018] As a further optimization of this technical solution, stirring plates are arranged on the outer wall of the upper part of the rotating rod in a circumferential arrangement, and the stirring plates are located inside the annular liquid storage box.

[0019] In the above technical solution, the rotating stirring plate enables the atomized water mist to better contact the flue gas.

[0020] The utility model provides a denitration device for cement production, which has the following beneficial effects:

[0021] (1) By installing an efficient denitration device in the utility model, when the filtered flue gas enters the denitration agent in the denitration tank, the stirring and mixing assembly is set to enable the flue gas to fully contact the denitration agent, and the flue gas is evenly distributed in the denitration agent, improving the denitration efficiency. In addition, by setting the circulation pipe and the liquid pump, the denitration agent is pumped into the annular liquid storage box and sprayed out from the nozzle, which can further denitrate the rising flue gas and can recycle the denitration agent to make full use of it, thereby saving the denitration agent.

[0022] (2) By installing a filtration and pretreatment structure in the utility model, the flue gas entering the denitration tank can be pre-filtered. When the flue gas is introduced through the air inlet pipe, the filter plate can filter the flue gas, reducing the wear of the subsequent catalyst by particulate impurities. And due to the influx of the flue gas, the rotating shaft and the filter plate are stirred, and then the filtered particulate impurities can be collected in the collection box for easy cleaning. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the whole utility model;

[0024] Figure 2 is a sectional view of the utility model;

[0025] Figure 3 is a schematic structural diagram of the filtration and pretreatment structure of the utility model;

[0026] Figure 4 is an enlarged view of Figure A of the utility model;

[0027] In the figure: 1, denitration tank; 11, liquid inlet pipe; 12, drain pipe; 13, inclined circular plate; 14, air outlet pipe; 15, induced draft fan; 2, filtration and pretreatment structure; 21, filter box; 22, air inlet pipe; 23, folded pipe; 24, collection box; 25, filtration component; 251, rotating shaft; 252, filter plate; 3, efficient denitration device; 31, stirring and mixing component; 32, spraying component; 311, supporting circular plate; 312, motor; 313, rotating rod; 314, stirring paddle; 315, stirring plate; 321, annular liquid storage box; 322, nozzle; 323, circulation pipe; 324, liquid pump. Detailed Description of the Preferred Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model.

[0029] The utility model provides a technical solution: Figure 1 and Figure 2 As shown, in this embodiment, a denitration device for cement production includes a denitration tank 1, a filtering pretreatment structure 2 is fixedly installed below the outer surface of the denitration tank 1, a high-efficiency denitration device 3 is installed inside the denitration tank 1, a liquid inlet pipe 11 is arranged on the upper outer wall of the denitration tank 1, a liquid discharge pipe 12 is arranged on the lower outer wall of the denitration tank 1, an inclined circular plate 13 is arranged on the bottom side of the denitration tank 1, an air outlet pipe 14 is arranged on the top side of the denitration tank 1, and a suction fan 15 is installed in the air outlet pipe 14.

[0030] like Figure 2 and Figure 3 As shown, the filtering pretreatment structure 2 includes a folded tube 23, the folded tube 23 passes through the outer wall of the denitration tank 1, one side of which is located inside the denitration tank 1, and the other side of the folded tube 23 is fixedly connected to a filter box 21, and the air inlet end of the filter box 21 is fixedly connected to an air inlet pipe 22. A filter assembly 25 is rotatably installed inside the filter box 21, and the filter assembly 25 includes a rotating shaft 251, and the rotating shaft 251 is arranged above the inside of the filter box 21 through a bearing. The outer wall of the rotating shaft 251 is provided with filter plates 252 arranged in a circumferential direction. A collecting frame 24 is slidably provided under the filter box 21 and is located under the filter plate 252. By installing the filter pretreatment structure 2, the flue gas entering the denitrification tank 1 can be pre-filtered. When the flue gas enters from the air inlet pipe 22, the flue gas can be filtered through the filter plate 252 to reduce the wear of the subsequent catalyst by particulate impurities. Due to the influx of flue gas, the rotating shaft 251 and the filter plate 252 are moved, so that the filtered particulate impurities can be collected in the collecting frame 24 for easy cleaning.

[0031] like Figure 2 and Figure 4As shown in the figure, the high-efficiency denitration device 3 includes a stirring and mixing assembly 31, which is installed inside the denitration tank 1. A spraying assembly 32 is fixedly installed on the inner wall above the denitration tank 1. The stirring and mixing assembly 31 includes a supporting circular plate 311, which is arranged on the inner wall above the denitration tank 1. A motor 312 is installed in the middle of the supporting circular plate 311. The output end of the motor 312 passes through the supporting circular plate 311 and is fixedly connected to a rotating rod 313. The rotating rod 313 extends to the lower part inside the denitration tank 1. Stirring paddles 314 are arranged on the outer wall of the lower part of the rotating rod 313 in the circumferential direction. The spraying assembly 32 includes an annular liquid storage box 321, which is arranged on the inner wall of the denitration tank 1 and is located below the supporting circular plate 311. Nozzles 322 are evenly arranged at the liquid outlet on the inner side of the annular liquid storage box 321. A circulating pipe 323 is fixedly connected to the liquid inlet of the annular liquid storage box 321. The circulating pipe 323 passes through the denitration tank 1 and turns back to be connected to the lower part of the denitration tank 1. A liquid pump 324 is installed on the circulating pipe 323. Stirring plates 315 are arranged on the outer wall of the upper part of the rotating rod 313 in the circumferential direction. The stirring plates 315 are located inside the annular liquid storage box 321. By installing the high-efficiency denitration device 3, when the filtered flue gas enters the denitration agent in the denitration tank 1, the stirring and mixing assembly 31 provided makes the flue gas fully contact with the denitration agent, and makes the flue gas evenly disperse in the denitration agent, improving the denitration efficiency. In addition, through the circulating pipe 323 and the liquid pump 324 provided, the denitration agent is pumped into the annular liquid storage box 321 and sprayed out from the nozzles 322, which can further denitrate the rising flue gas and can recycle the denitration agent, making it fully utilized, thereby saving the denitration agent. Commonly used denitration agents include urea, ammonia water, ammonia soda, etc.

[0032] The present utility model provides a denitration device for cement production, and the specific working principle is as follows: It is connected to the flue gas pipe through 22, and the suction fan 15 is started. The flue gas can be filtered through the filter plate 252. Due to the influx of the flue gas, the rotating shaft 251 and the filter plate 252 are driven to move, and the filtered particulate impurities are collected in the collection box 24. The flue gas enters the denitration agent in the denitration tank 1 through the folded pipe 23. At the same time, the motor 312 is started to drive the rotating rod 313 and the stirring paddles 314 to rotate, so that the flue gas is fully mixed with the denitration agent. At the same time, the liquid pump 324 is started, and the denitration agent in the denitration tank 1 can be pumped into the annular liquid storage box 321 through the circulating pipe 323 and sprayed out from the nozzles 322 to further denitrate the rising flue gas. The rotating stirring plates 315 make the atomized water mist better contact with the flue gas until the flue gas rises and is discharged from the air outlet pipe 14.

[0033] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A denitration device for cement production, comprising a denitration tank (1), characterized in that: A filtering pretreatment structure (2) is fixedly installed below the outer surface of the denitration tank (1), and a high-efficiency denitration device (3) is installed inside the denitration tank (1); The filtering pretreatment structure (2) comprises a folded tube (23), the folded tube (23) passes through the outer wall of the denitration tank (1), one side of the folded tube (23) is located inside the denitration tank (1), the other side of the folded tube (23) is fixedly connected to a filter box (21), the air inlet end of the filter box (21) is fixedly connected to an air inlet pipe (22), and a filter assembly (25) is rotatably installed inside the filter box (21); The high-efficiency denitration device (3) comprises a stirring and mixing component (31), wherein the stirring and mixing component (31) is installed inside the denitration tank (1), and a spray component (32) is fixedly installed on the inner wall above the denitration tank (1).

2. A denitration device for cement production according to claim 1, characterized in that: The denitration tank (1) is provided with a liquid inlet pipe (11) on the upper outer wall, the denitration tank (1) is provided with a liquid discharge pipe (12) on the lower outer wall, the denitration tank (1) is provided with an inclined circular plate (13) on the bottom side, the denitration tank (1) is provided with an air outlet pipe (14) on the top side, and a suction fan (15) is installed in the air outlet pipe (14).

3. A denitration device for cement production according to claim 1, characterized in that: The filter assembly (25) comprises a rotating shaft (251), the rotating shaft (251) being arranged above the inside of the filter box (21) via a bearing, and filter plates (252) being arranged on the outer wall of the rotating shaft (251) in a circumferential direction.

4. A denitration device for cement production according to claim 1, characterized in that: A collecting frame (24) is slidably disposed below the filter box (21) and is located below the filter plate (252).

5. A denitration device for cement production according to claim 1, characterized in that: The stirring and mixing assembly (31) comprises a supporting circular plate (311), the supporting circular plate (311) being arranged on the upper inner wall of the denitration tank (1), a motor (312) being installed in the middle of the supporting circular plate (311), an output end of the motor (312) passing through the supporting circular plate (311) and being fixedly connected to a rotating rod (313), the rotating rod (313) extending to the lower part of the denitration tank (1), and stirring paddles (314) being arranged in a circumferential direction on the outer wall below the rotating rod (313).

6. A denitration device for cement production according to claim 1, characterized in that: The spray assembly (32) comprises an annular liquid storage box (321), the annular liquid storage box (321) being arranged on the inner wall of the denitration tank (1) and below the supporting circular plate (311), nozzles (322) being arranged at equal intervals at the liquid outlet inside the annular liquid storage box (321), a circulation pipe (323) being fixedly connected to the liquid inlet of the annular liquid storage box (321), the circulation pipe (323) passing through the denitration tank (1) and folding back to be connected to the bottom of the denitration tank (1), and a liquid pump (324) being installed on the circulation pipe (323).

7. A denitration device for cement production according to claim 5, characterized in that: The outer wall above the rotating rod (313) is provided with stirring plates (315) arranged in a circumferential direction, and the stirring plates (315) are located inside the annular liquid storage box (321).

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