The importance of removing nitrogen oxides from combustion flue gas and preventing environmental pollution has been pointed out as a worldwide problem among the more mainstream workers in the world, SCR and SNCR
The woking
1. Selective non-catalytic jade raw material technology The most commonly used agents are hydrogen and urea.Generally speaking, SNCR denitrification efficiency can reach 25% ~ 40% for large coal-fired units and 80% for small units.Because the method is greatly affected by the boiler structure size, it is often used as a supplementary treatment for low-nitrogen combustion technology.Its construction cost is low,Simple layout, small area, suitable for old plant diversion, new plant can be used according to the boiler design.
2. Selective catalytic reduction technology (SCR)SCR is the most mature flue gas denitrification technology at present. It is a kind of post-furnace denitrification method, which USES reducing agent (NH3, urea) to selectively react with NOx to produce N2 and H2O, instead of being oxidized by O2, so it is called "selective".The popular SCR processes in the world are mainly divided into ammonia SCR and urea SCR.In both methods, the reduction function of ammonia on NOx is utilized to reduce N0x(mainly NO) to N2 and water with little impact on atmosphere under the action of catalyst, and the reducing agent is NH3.
Most of the catalysts used in SCR take TiO2 as the carrier and V2O5 or V2O5--WO3 or v2o5-moo3 as the active components, which are made into honeycomb type, plate type or corrugated type.SCR catalysts applied in denitrification of flue gas can be divided into high-temperature catalysts (345c-590 'C), medium-temperature catalysts (260C ~ 380C) and low-temperature catalysts (80C ~ 300C). Different catalysts have different reaction temperatures.
Advantages: this method has high efficiency and low price. It is widely used in domestic and foreign projects and has become the mainstream technology of power station flue gas denitrification.
The process flow
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