Denitrification catalyst refers to the catalyst on the SCR (selective catalytic reduction) denitrification system of power plants, which is the substance that induces the chemical reaction between the reducing agent and the nitrogen oxides in the flue gas selectively at a certain temperature in the SCR reaction. As an important part of the flue gas treatment process, it is now widely used in various fields such as power and non-power industries, and has achieved good results.
The commonly used denitrification catalysts in the market nowadays are V2O5-WO3(MoO3)/TiO2 series. Different combustion raw materials and different flue gas compositions have led to the creation of catalysts with different compositions.
Characteristics of glass kiln flue gas
Larger content of alkali metals and larger amount of dust.
Domestic glass production lines mainly use rock tar, heavy oil, natural gas and furnace gas as fuels, which have small dust particle size and strong adhesion, and high NOx concentration in flue gas, mostly above 2000mg/m3; in addition, during the dynamic fire change of the kiln, SO2, NOx and dust concentration will change drastically, which increases the difficulty of flue gas denitrification.
Characteristics of biomass power generation flue gas
Biomass has high hydrogen content and high water content in the flue gas, with water content up to 15%-30%, and the soot contains high mass fraction of alkali metals, up to 8% or more. Furthermore, the SO2 and NOx concentrations are low and fluctuating, and the SO2 and NOx mass concentrations fluctuate from 100-250 mg/m3 when burning pure biomass.
Glass kiln and biomass power flue gas denitrification processing difficulties
Mainly, the alkali metal content is high and viscous, especially the working condition where the fuel is petroleum tar.
Alkali metal ions Na+, K+, Mg2+, Ga2+, etc. are widely present in the flue gas, which easily bond chemically with the structure of V2O5, opening the V-OH bond, occupying the surface acidic sites and active sites, generating compounds that do not have catalytic ability, weakening the adsorption and activation of the reductant NH3 while inhibiting the ability to oxidize NO to surface NO2, thus leading to catalyst Several SCR reaction paths on the catalyst are inhibited and severe catalyst deactivation occurs.
Alkali metal resistant SCR denitrification catalysts
In response to the above industry flue gas characteristics and emission reduction difficulties, Yuanchen Technology has developed a matching alkali metal resistant SCR denitrification catalyst, which can remove NOx from the above flue gas with high efficiency and good resistance to alkali metal poisoning. Commonly used cellular denitrification catalysts have 20, 22 and 25 pores.
Anhui Yuanchen Environmental Technology Co., Ltd (hereinafter referred to as "
Yuanchen Technology") is a high-tech enterprise integrating R&D, production and sales of dust removal bags and denitrification catalysts. Over the past 15 years, Yuanchen Technology has been focusing on the environmental protection field, and now has 4 international PCT, 33 authorized invention patents and 77 invention patents in process, among which many products such as "dust removal and denitrification integrated technology products" have been awarded the Scientific Progress Award of Anhui Province. The products of dust bag (mainly PPS, PTFE, P84 and composite series filter materials) and SCR denitrification catalyst have been widely used in cement, steel, glass kilns, waste incineration power generation, biomass power generation, non-ferrous metal smelting and other industries!
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