W-firing boiler NOx ultra-clean emission method and SCO ammonia removal catalyst thereof

A kind of ammonia catalyst and catalyst technology, applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, separation method, etc., can solve the problem of high NOx emission value, achieve high activity, reduce cost, improve The effect of conversion efficiency

Inactive Publication Date: 2017-06-09
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of boiler is characterized by high NOx emission value, and the NOx emission value is generally 850-1300mg / m under rated output conditions 3 However, existing ultra-clean emission technologies cannot reduce this value to 50 mg / m without increasing ammonia slip 3 , therefore, it is particularly necessary and important to develop NOx ultra-clean emission technology suitable for W-flame boilers

Method used

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  • W-firing boiler NOx ultra-clean emission method and SCO ammonia removal catalyst thereof
  • W-firing boiler NOx ultra-clean emission method and SCO ammonia removal catalyst thereof
  • W-firing boiler NOx ultra-clean emission method and SCO ammonia removal catalyst thereof

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Embodiment 1

[0031] SCO Ammonia Removal Catalyst Carrier Selects Nano α-Al 2 o 3 , wherein the mass fraction of the cerium element in the catalyst is 9%, the mass fraction of the copper element in the catalyst is 5%, the mass fraction of the cobalt element in the catalyst is 2%, and the mass fraction of the vanadium element in the catalyst is 0.5%. The simulated flue gas condition is: NH 3 The content is 500ppm, SO 2 The content is 200ppm, O 2 The content is (v / v) 6%, the NOx content is 500ppm, the water vapor is 5%, the smoke temperature is 300°C, and the space velocity is 4000h -1 .

Embodiment 2

[0033] The carrier of SCO ammonia removal catalyst is nano-titanium oxide, wherein the mass fraction of cerium element in the catalyst is 12%, the mass fraction of copper element in the catalyst is 3%, the mass fraction of cobalt element in the catalyst is 2%, and the mass fraction of vanadium element in the catalyst The score is 1%. The simulated flue gas condition is: NH 3 The content is 500ppm, SO 2 The content is 1000ppm, O 2 The content is (v / v) 7%, the NOx content is 500ppm, the water vapor is 5%, the smoke temperature is 350°C, and the space velocity is 2000h -1 .

Embodiment 3

[0035] The carrier of SCO ammonia removal catalyst is nano titanium oxide, wherein the mass fraction of cerium element in the catalyst is 10%, the mass fraction of copper element in the catalyst is 2%, the mass fraction of cobalt element in the catalyst is 2%, and the mass fraction of vanadium element in the catalyst The score is 0.5%. The simulated flue gas condition is: NH 3 The content is 600ppm, SO 2 The content is 2000ppm, O 2 The content is (v / v) 6%, the NOx content is 500ppm, the water vapor is 5%, the smoke temperature is 380°C, and the space velocity is 5000h -1 .

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Abstract

The invention discloses a W-firing boiler NOx ultra-clean emission method and an SCO ammonia removal catalyst thereof. The process is simple, high in denitration efficiency and low in ammonia escape. Meanwhile, the SCO catalyst is simple in preparation, high in activity and low in cost. The SCO ammonia removal catalyst comprises active ingredients and a carrier, wherein the active ingredients are prepared by calcining active ingredient precursors; the active ingredient precursors refer to cerium salts, copper salts, cobalt salts and vanadium salts; the cerium salts, copper salts or cobalt salts refer to nitrate, acetate or sulfate; the vanadium salt refers to ammonium metavanadate or vanadiumoxy acetylacetonate; the carrier is anatase type nano TiO2 or nano alpha-Al2O3; a mass fraction of cerium accounting for the catalyst is 1-20%; a mass fraction of copper accounting for the catalyst is 0-15%; a mass fraction of cobalt accounting for the catalyst is 0-15%; a mass fraction of vanadium accounting for the catalyst is 0.5-5%.

Description

technical field [0001] The invention relates to a method for ultra-clean emission of NOx from a W-shaped flame boiler, in particular to a method for ultra-clean emission of NOx from a W-shaped flame boiler and an SCO ammonia removal catalyst thereof. Background technique [0002] With the country's emphasis on environmental protection, ultra-clean emissions are becoming a hot spot in the field of power environmental protection. The so-called ultra-clean emission refers to the emission standard of major atmospheric pollutants of coal-fired units meeting the emission standards of natural gas units (smoke and dust 5mg / m3) through appropriate technology. 3 , SO 2 35mg / m 3 , NOx 50mg / m 3 ). Among them, NOx ultra-clean emission is one of the core technologies of the entire ultra-clean emission. At present, the methods to achieve ultra-clean NOx emissions of coal-fired units mainly include: low-nitrogen transformation of the burner and optimization of the SCR denitrification ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01D53/90B01D53/56B01D53/58
CPCB01J23/8472B01D53/8625B01D53/8634B01D53/869B01D53/90B01D2251/2062B01D2258/0283B01J35/02B01J35/04
Inventor 杨嵩程广文姚明宇赵婷雯杨成龙赵瀚辰付康丽李阳蔡铭
Owner XIAN THERMAL POWER RES INST CO LTD
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