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Semi-dry SCR denitration system and method for cement kiln

A semi-dry, cement kiln technology, applied in the field of air pollution control, can solve the problems of large denitrification investment, high operation cost, easy blockage and poisoning, etc., and achieves the effects of high reaction efficiency, reduced management difficulty, and reduced pharmaceutical costs.

Pending Publication Date: 2021-06-11
安徽萃智环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-investment, high-performance Cement kiln semi-dry SCR denitrification system and method with low cost, no clogging, no poisoning, and no cleaning

Method used

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  • Semi-dry SCR denitration system and method for cement kiln
  • Semi-dry SCR denitration system and method for cement kiln
  • Semi-dry SCR denitration system and method for cement kiln

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Experimental program
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Effect test

Embodiment 1

[0039] refer to figure 1 , a 4000t / d cement plant, the kiln tail flue gas is discharged from the C1 preheater, flows through the waste heat boiler (or humidification tower), high temperature fan, (raw meal mill), bag filter, kiln tail fan, The chimney is discharged into the atmosphere, among which, the discharge temperature at the C1 preheater is 300-350°C, and the SNCR denitrification system is installed at the calciner, and the kiln tail flue gas is normally NO X The emission is stable at 200-320mg / m 3 , to meet the national special area emission standards. As the local cement industry implements ultra-low emission requirements, after the company introduces this embodiment, its NO X The emission is stable at 10-30mg / Nm 3 , which can reduce 395 tons of NO emissions per year X . The specific process of this embodiment scheme is as follows: Utilize equipment such as preheater system 20, flue gas pipeline 21, high-temperature fan 22, kiln tail dust collector 23 of existing ...

Embodiment 2

[0041] refer to figure 2 , a 5000t / d cement plant, the kiln tail flue gas is discharged from the C1 preheater, flows through the waste heat boiler, high temperature fan, (raw meal mill), bag filter, kiln tail fan, and chimney, and then is discharged into the atmosphere , among which, the discharge temperature at the C1 preheater is 280-330°C, and the SNCR denitrification system is installed at the calciner. Under normal conditions, the kiln tail flue gas is NO X The emission is stable at 200-250mg / m 3 , to meet the national special area emission standards. As the local cement industry implements ultra-low emission requirements, it is required to achieve a nitrate emission of 50 mg / m in 2022 3 , after the company introduces the scheme of this embodiment, its NO X The emission is stable at 5-35mg / Nm 3 . The specific process of this embodiment scheme is as follows: Utilize equipment such as the preheater system 20 of existing dry-process cement kiln, flue gas pipeline 21, h...

Embodiment 3

[0043] refer to image 3 , a 5000t / d cement plant, the kiln tail flue gas is discharged from the C1 preheater, flows through the waste heat boiler, high temperature fan, (raw meal mill), bag filter, kiln tail fan, and chimney, and then is discharged into the atmosphere , among which, the discharge temperature at the C1 preheater is 250-300°C, and the SNCR denitrification system is installed at the calciner. Normally, the kiln tail flue gas is NO X The emission is stable at 250-350mg / m 3 , after the company introduces the scheme of this embodiment, its NO X The emission is stable at 5-35mg / Nm 3 . The specific process of this embodiment scheme is as follows: use the preheater system 20, exhaust pipe 21, high-temperature fan 22, kiln tail dust collector 23 and other equipment of the existing dry process cement kiln; set the liquid distribution device 11, the electric control device 12. Distributor 13, according to manganese sulfate: iron sulfate: tungsten sulfate: vanadyl sul...

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Abstract

The invention discloses a semi-dry method SCR denitration system and method for a cement kiln. The existing cement kiln equipment is utilized; two liquid tanks containing a salt solution of transition metal and an alkaline solution are arranged, and the solutions are conveyed to a reactor to quickly react to become liquid containing metal compound particles in a hydroxide or carbonate form; the liquid containing the metal compound particles is conveyed to a spray gun arranged on a smoke exhaust pipeline, and atomized liquid is sprayed into the smoke exhaust pipeline through the spray gun at high pressure; the liquid is vaporized at a high temperature and decomposed to obtain catalytic particles containing transition metal oxides and composite transition metal oxides; the catalytic particles are fully mixed with the flue gas, flow along with the flue gas and catalyze the flue gas containing a reducing agent and NOX to be subjected to an SCR denitration reaction, and nitrogen and water are generated; the catalytic particles are collected at the dust collector and then enter the preheater system, and the flue gas is catalyzed again to be subjected to the SCR denitration reaction. The invention has the characteristics of low investment, low operation cost, no blockage, no poisoning, high reliability and the like.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a cement kiln semi-dry SCR denitrification system and method. Background technique [0002] According to statistics, the total amount of nitrogen oxides emitted by cement kilns accounted for 20% of the total industrial nitrogen oxides emissions in 2017, and has become the main source of air pollution emissions. The nitrogen oxide control technologies of cement kilns mainly include staged combustion technology, SCR denitrification technology, SNCR denitrification technology, LCO flue gas purification technology, etc. Staged combustion technology can reduce a certain amount of nitrogen oxides produced, but it cannot achieve ultra-low emissions (nitrate emissions are below 50mg / Nm 3 ). The LCO method mainly uses the catalytic oxidation method to desulfurize and denitrify, so as to realize the transformation of sulfur and nitric acid into chemical fertilizers, but it needs to u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283
Inventor 韩建英李灿华丁奇生李春萍李红王昭然张永柱
Owner 安徽萃智环保科技有限公司
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