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NOx control method and device for coke oven stack gas

A technology of nitrogen oxides and control methods, which is applied to coke ovens, coke oven heating, coke oven parts, etc., can solve the problems of no very effective control methods, high operating costs, and huge investment in treatment equipment to meet environmental protection requirements. Effects of Emissions Requirements

Pending Publication Date: 2015-12-30
JINAN HONGKEXINTAI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Post-combustion control technology generally uses catalytic decomposition technology to decompose NOx in the exhaust gas of the coke oven chimney, and the investment in the treatment device is huge, and the operating cost is high
[0006] Combustion control technologies include exhaust gas circulation, segmental heating, etc., but they all need to be arranged in the design of the coke oven. For the coke ovens that have been put into production, there is no very effective control method. With the continuous improvement of environmental protection requirements, it has become a constraint Important Factors for the Survival and Development of Coking Enterprises

Method used

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  • NOx control method and device for coke oven stack gas
  • NOx control method and device for coke oven stack gas
  • NOx control method and device for coke oven stack gas

Examples

Experimental program
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Embodiment 1

[0026] In this embodiment, a coke oven chimney exhaust gas nitrogen oxide control method includes:

[0027] A. Lay a waste gas main pipe above the coke oven waste gas switch, use the induced draft fan to draw the waste gas in the coke oven main flue, and send it into the waste gas main pipe;

[0028] B. A plurality of exhaust gas blowing mechanisms are arranged below the exhaust gas main pipe. The exhaust gas blowing mechanism includes a three-way housing, and the upper end passage of the three-way housing communicates with the exhaust gas main pipe. The three-way housings are respectively arranged downwards The left fork pipe and the right fork pipe are symmetrical to each other, the connection of the left fork pipe and the right fork pipe is provided with an exchange flap, and the exchange flap is externally connected with a rocker arm, and is linked with the coke oven exchange bar;

[0029] C. When the coke oven exchange bar pulls the damper of the exhaust gas switch, it al...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is that the nitrogen oxide content signal detected by the chimney gas nitrogen oxide online detection device is connected to the control system, which can automatically control the speed of the induced draft fan, thereby realizing automatic adjustment of coke oven chimney gas nitrogen. The purpose of oxide content.

Embodiment 3

[0034] as attached figure 1 As shown, a coke oven chimney waste gas nitrogen oxide control device includes a waste gas main pipe 2 connected to the coke oven main flue 1 and a waste gas blowing mechanism 5 arranged above the damper 4 of the coke oven waste gas switch 3, the waste gas main pipe 2 and the coke oven main flue 1 is provided with an induced draft fan 6, the waste gas blowing mechanism 5 is a three-way structure, one end of the passage is connected to the waste gas main pipe 2, and the passages at the other two ends are respectively located in the adjacent two Above the damper 4 of the coke oven exhaust gas shutter 3.

[0035] as attached figure 2 , 3 As shown, the exhaust gas blowing mechanism 5 in this embodiment includes a three-way housing 51, the upper end passage of the three-way housing 51 communicates with the exhaust gas main pipe 2, and the three-way housings 51 are respectively arranged downwards Symmetrical left fork tube 52 and right fork tube 53, t...

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Abstract

The invention relates to the technical field of coke oven equipment upgrading, in particular to a NOx control method and device for coke oven stack gas. The device comprises a stack gas main pipe communicated with a main chimney flue of a coke oven and stack gas blowing-in mechanisms arranged above dampers of coke oven stack gas shutters, wherein an induced draft fan is arranged between the stack gas main pipe and the main chimney flue of the coke oven; each stack gas blowing-in mechanism adopts a three-way turn plate switching mechanism, one channel of the mechanism is communicated with the stack gas main pipe, the other two channels are formed above the dampers of two adjacent coke oven stack gas shutters, and the stack gas blowing in direction can be changed through switching of turn plates. According to the NOx control method and device for the coke oven stack gas, the conventional coke oven production equipment is improved, so that the content of emitted NOx is controlled effectively with an air depletion method.

Description

technical field [0001] The invention relates to the technical field of coke oven equipment transformation, in particular to a method and device for controlling coke oven chimney exhaust gas nitrogen oxides. Background technique [0002] Nitrogen oxides (NOx) are produced when coke oven gas is burned in the coke oven combustion chamber. Nitrogen oxides usually refer to a mixture of NO and NO2. Nitrogen oxides in the atmosphere destroy the ozone layer, cause acid rain, and pollute the environment. In the mid-1980s, developed countries regarded it as a harmful gas and proposed emission control standards. At present, the control standards in developed countries are basically nitrogen oxides (O in exhaust gas) 2 content converted to 5%), the mass concentration of heating with coke oven gas shall not be greater than 500mg / m3 in terms of NOx 3 , the mass concentration of heating with depleted gas (mixed gas) is not more than 350mg / m 3 (170ppm). [0003] With the rapid developme...

Claims

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Application Information

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IPC IPC(8): C10B21/00C10B29/00
Inventor 朱广栋许文明
Owner JINAN HONGKEXINTAI ENVIRONMENTAL PROTECTION TECH CO LTD
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