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Pellet flue gas denitrification method

A flue gas and pellet technology, applied in the field of flue gas denitration treatment, can solve the problems of large investment and increased pollutant discharge, and achieve the effects of less basic investment, saving treatment costs, and saving land occupation

Active Publication Date: 2019-12-03
LIUZHOU IRON & STEEL
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Problems solved by technology

[0006] The invention provides a pelletizing flue gas denitrification method to solve the problems of large investment and increased pollutant discharge in the existing denitrification method

Method used

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Embodiment Construction

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.

[0033] Such as figure 1 and figure 2 As shown, the present invention proposes a method for pelletizing flue gas denitrification, and the method for pelletizing flue gas denitrification includes:

[0034] Step A: Inject liquid reductant in the flue 3 between the pellet grate 1 and the pellet rotary kiln 4;

[0035] Step B: using the high temperature of the flue gas in the flue 3 to vaporize the droplets formed by the injected reducing agent into ammonia;

[0036] Step C: In the flue 3, the ammonia and the nitrogen oxides in the flue gas undergo a redox reaction, and the nitrogen oxides are reduced to nitrogen and water;

[0037] Step D: Make the remaining unreacted ammonia and flue gas enter the ammonia desulfurization tower 5 for recovery.

[0038] Further: Drill...

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Abstract

The invention provides a pellet flue gas denitration method. The pellet flue gas denitration method comprises the steps: step A: injecting a liquid reducing agent into a gas duct between a pellet chain grate and a pellet rotary kiln; step B : using high temperature of the flue gas in the gas duct to vaporize droplets formed by the injected reducing agent into ammonia gas; step C: in the gas duct,conducting oxidation-reduction reaction on nitrogen oxides in the ammonia gas and the flue gas to reduce the nitrogen oxides to nitrogen and water, enabling the remaining unreacted flue gas to enter into an ammonia desulfurization tower together, recovering the ammonia gas and enabling the ammonia gas to enter the ammonia desulfurization tower together with the flue gas for recovery. The pellet flue gas denitration method has the advantages of less investment, less land occupation, low operating cost, and no other harmful gases.

Description

technical field [0001] The invention relates to the field of flue gas denitrification treatment, in particular to a technical method for pelletizing flue gas denitrification treatment in the iron and steel industry, that is, a method for pelletizing flue gas denitrification. Background technique [0002] The pollutants in the iron and steel industry pellet flue gas mainly come from the SO produced by the combustion of coal powder and coke powder. 2 , CO and NO X , these pollutants enter the ambient air to cause pollution. Iron and steel enterprise pellets use catalytic reduction method or activated carbon adsorption catalytic method for denitrification. [0003] Judging from the actual operation of sintered pellets, the catalytic reduction method requires the use of a special catalyst, which has high investment costs, takes up a large area, is easy to block, troublesome to maintain, has a short catalyst life, needs to be replaced regularly, and has solid waste to be dispos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D2251/2062B01D2258/0283
Inventor 黎柳升吴文升韦晋科张艾红甘牧原陈阳梁杰群马承胜卢福德
Owner LIUZHOU IRON & STEEL
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