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Device and method for reducing nitrogen oxide generated by coke oven

A nitrogen oxide and coke oven technology, applied in the heating of coke oven, coke oven, coke oven parts, etc., can solve the problems of unchangeable coke oven structure, nitrogen oxide emission, etc. Emission reduction, effect of changing combustion flame length

Active Publication Date: 2016-06-15
JINNENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the coke ovens that have been put into production, the structure of the coke oven cannot be changed, and air staged combustion cannot be used to solve the problem of nitrogen oxide emissions

Method used

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  • Device and method for reducing nitrogen oxide generated by coke oven
  • Device and method for reducing nitrogen oxide generated by coke oven
  • Device and method for reducing nitrogen oxide generated by coke oven

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: A tuyere 18 of the bidirectional axial flow fan 1 is connected to the oven hole at the end of the coke oven basement machine side or the coke side flue through the pipe 2 to take exhaust gas. The other tuyere 18 of the two-way axial flow fan 1 communicates with the side cover of the exchange switch 4 of the coke oven through the pipe 2, and the exhaust gas is sent into the updraft of the exchange switch 4 to mix with the air. The oven bakes the cold coke oven, and the masonry is dried, dehydrated and heated up to prepare for the transition of the coke oven to the production state. In this embodiment, it is relatively convenient to take exhaust gas from the existing oven hole.

Embodiment 2

[0042] Embodiment 2: A tuyere 18 of the two-way axial flow fan 1 is connected to the oven hole at the end of the sub-flue of the coke oven basement or the side of the coke oven and the flap of the sub-flue through the pipe 2, and the waste gas is taken from two places at the same time. exhaust gas. The other tuyere 18 of the two-way axial flow fan 1 communicates with the side cover of the exchange switch 4 of the coke oven through the pipe 2, and the exhaust gas is sent into the updraft of the exchange switch 4 to mix with the air. When the coke oven production load is adjusted, both gas and air consumption need to be adjusted. At this time, it is necessary to adjust the suction of the branch flue, that is, to adjust the opening of the branch flue flap. This embodiment is to get exhaust gas supply exchange switch 4 updraft from branch flue two ends (oven hole and branch flue flap place).

Embodiment 3

[0043] Embodiment 3: A tuyere 18 of the two-way axial flow fan 1 is connected to a branch flue at the lower end of an exchange switch 4 on the coke oven machine side or the coke side through the pipe 2 to take exhaust gas. The other tuyere 18 of the two-way axial flow fan 1 communicates with the side covers of the other exchange switches 4 on both sides of the exchange switch 4 through the pipe 2 . This exchanging switch 4 is a descending airflow, and the other exchanging switches 4 on both sides are an ascending airflow, and waste gas is sent to the ascending airflow of other exchanging switches 4 on both sides. During the implementation of this embodiment, because the gas is taken from the sub-flue below a certain exchange switch 4, the amount of gas taken is relatively large, and it can be used by a plurality of exchange switches 4 that are in the updraft, and can be supplied according to the amount of waste gas taken. 3 to 5 replacement switches 4 are used.

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Abstract

The invention discloses a device for reducing nitrogen oxide generated by a coke oven.The device comprises a bidirectional axial-flow fan, an electric control system and a measuring device.The bidirectional axial-flow fan is arranged at a smoke distribution flue corridor of the coke oven, a wind opening is communicated with a waste gas channel of the coke oven via a pipeline, and another wind opening is communicated with an air channel of the coke oven via a pipeline.The rotational speeds and the rotational directions of the bidirectional axial-flow fan are controlled by the electric control system; the concentration of the nitrogen oxide in waste gas in the pipelines is detected by the measuring device.A method for reducing the nitrogen oxide generated by the coke oven includes exhausting the waste gas in the waste gas channel of the coke oven, forcedly feeding the waste gas into the air channel of the coke oven and mixing the waste gas with air; reducing the content of oxygen in the air by the aid of the waste gas.The device and the method have the advantages that the internal structure of the coke oven does not need to be changed, the concentration of the nitrogen oxide in the waste gas and the absolute emission load of the nitrogen oxide can be obviously lowered, and surrounding atmospheric environments of enterprises can be improved.

Description

technical field [0001] The invention relates to a technical measure for reducing air pollution by coke ovens, in particular to a device and method for reducing nitrogen oxides produced by coke ovens. Background technique [0002] Pollutants emitted from coke oven chimneys are mainly SO 2 , NO x And smoke and dust, etc., the pollutants are continuously discharged in the form of organized elevated point sources, which is one of the main pollution sources of polluting the atmosphere. When the gas burns in the vertical flue of the coke oven, it will generate nitrogen oxides NO x According to the mechanism of its generation, it can be divided into three types: temperature thermal type, hydrocarbon fuel fast type and oxygen-containing component fuel type. When the air excess coefficient α=1.1 and the air is preheated to 1100°C, the theoretical combustion temperature of coke oven gas is 2350°C, and the theoretical combustion temperature of blast furnace gas is 2150°C. It is gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B21/10C10B29/00
CPCC10B21/10C10B29/00
Inventor 范安林黄冲宇张建社王瑞李金伟罗伟
Owner JINNENG SCI & TECH
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