Cement kiln flue gas denitration process

A cement kiln and denitrification technology, which is applied in the direction of gas treatment, dispersed particle separation, membrane technology, etc., can solve the problems of flue gas backflow, secondary pollution, and low denitration efficiency, so as to increase the processing capacity, increase time, and improve The effect of denitrification effect

Active Publication Date: 2019-12-20
冀东水泥重庆合川有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A large amount of nitrogen oxides will be produced in the cement production process, and the direct discharge of nitrogen oxides in the flue gas will cause environmental pollution
At present, ammonia gas is injected into the denitrification tower, and ammonia gas is used as a reducing agent to reduce nitrogen oxides into nitrogen gas; however, the denitrification efficiency is low, and ammonia escape will occur, causing secondary pollution
[0003] Nowadays, carbonaceous material filter layers are usually installed in the denitrification tower. After nitrogen oxides pass through the carbonaceous material filter layer, the nitrogen oxides are reduced. The denitrification effect is not very good. Usually, it is necessary to install multiple carbonaceous material filter layers. The cost Higher; and when replacing the filter layer of carbonaceous material, it is necessary to stop the kiln or block the flue gas pipe. On the one hand, stopping the kiln will affect the production progress; have an impact

Method used

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  • Cement kiln flue gas denitration process
  • Cement kiln flue gas denitration process
  • Cement kiln flue gas denitration process

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] A cement kiln flue gas denitrification process, comprising the following steps:

[0027] Step 1: Mix vanadium-titanium slag, biomass carbon powder, cement raw meal, foaming agent, and water with masses of 2kg, 8kg, 30kg, 1kg, and 20kg respectively, and pour to form a denitrification cylinder 1, which is round Cylindrical, wherein the particle size of the biomass carbon powder is 0.02mm, and pores are formed on the wall of the denitrification cylinder 1;

[0028] Step 2: If figure 1 , 2 As shown, the lower part of the denitrification tower 2 is fixedly installed on the frame by bolts, and the bottom of the denitrification tower 2 is provided with a leakage port, and the bottom of the denitrification tower 2 is slidably provided with a baffle 3 for sealing the leakage port; The upper part of the tower 2 is in the shape of a cuboid, and the rotating tube 4 is installed horizontally in the denitrification tower 2, such as figure 2 As shown, after the rotating pipe 4 pen...

Embodiment 2

[0034] In order to solve the problem that there is no need to stop the kiln when replacing the denitrification cylinder 1, on the basis of embodiment 1, the denitrification tower 2 of embodiment 2 is also provided with a broken cylinder pouring mechanism. The broken cylinder pouring mechanism includes a broken cylinder unit and a pouring unit. In step 2 of Example 1, after the denitration cylinder 1 has been used for a period of time, the cylinder breaking unit can break the denitration cylinder 1 in the denitration tower 2, and the pouring unit can pour in the denitration tower 2 to form a new denitration cylinder 1.

[0035] Specifically, such as figure 2 As shown, the pouring unit includes a pouring port 6 and a casing 7, the left end of the casing 7 is sealed, the casing 7 runs through the left side wall of the denitrification tower 2 and is rotatably connected with the left side wall of the denitrification tower 2, and the left end of the casing 7 passes through the The ...

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Abstract

Belonging to the field of flue gas treatment, the invention particularly relates to a cement kiln flue gas denitration process. The process includes the steps of: S1. conducting pouring to form a denitration barrel, and forming pores on the barrel wall of the denitration barrel; S2. horizontally and rotatably arranging the denitration barrel in a denitration tower; S3. in the rotating process of the denitration barrel, letting flue gas contact the denitration barrel and then enter the pores, adopting vanadium-titanium in the slag as a catalyst for nitrogen oxide reduction, and reducing the nitrogen oxide in the flue gas into nitrogen by biomass charcoal powder; and S4. letting the flue gas entering the pores flows in the step 3 flow reversely under the blocking of a rotating pipe, reducingpart of the unreduced nitrogen oxide in the flue gas into nitrogen by biomass charcoal powder, and further enabling the denitration barrel to rotate along with the rotating pipe in the reverse flow process, and discharging the nitrogen out of the denitration tower after escape from the pores. The technical scheme adopted by the invention can improve the flue gas denitration effect.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to a cement kiln flue gas denitrification process. Background technique [0002] A large amount of nitrogen oxides will be produced in the cement production process, and the direct discharge of nitrogen oxides in the flue gas will cause environmental pollution. At present, ammonia gas is injected into the denitrification tower, and ammonia gas is used as a reducing agent to reduce nitrogen oxides into nitrogen gas; however, the denitrification efficiency is low, and ammonia escape will occur, causing secondary pollution. [0003] Nowadays, carbonaceous material filter layers are usually installed in the denitrification tower. After nitrogen oxides pass through the carbonaceous material filter layer, the nitrogen oxides are reduced. The denitrification effect is not very good. Usually, it is necessary to install multiple carbonaceous material filter layers. The cost Hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8631B01D2258/0233
Inventor 房浩李彬谷茂韩伟李明凯
Owner 冀东水泥重庆合川有限责任公司
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