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Product Details
Features

Selective Catalytic Reduction

SCR (Selective Catalytic Reduction) is a selective catalytic reduction technology. At present, ammonia catalytic reduction method is the most widely used technology. It has no by-products, no secondary pollution, simple device structure, high removal efficiency (up to 90%), reliable operation, and easy maintenance. Selectivity means that in the presence of oxygen and in the presence of oxygen, NH3 preferentially undergoes a reduction and removal reaction with NOx to form nitrogen and water, without oxidizing with the oxygen in the flue gas.

Its main reaction formula is:

(1) 4NO + 4NH3 + O2 → 4N2 + 6H2O

(2) 2NO2 + 4NH3 + O2 → 3N2 + 6H2O

In the absence of a catalyst, the above-mentioned chemical reaction is only carried out in a very narrow temperature range (about 980 ° C). When the catalyst is used, the reaction temperature can be controlled at 300-400 ° C, which is equivalent to the boiler economizer and air pre-conditioning. The temperature of the flue gas between the heaters is exothermic. Due to the low concentration of NOx in the flue gas, the increase in catalyst temperature caused by the reaction can be ignored.

Technical characteristics

Advantage:

• High denitrification efficiency: It is the most mature denitrification technology at present, with an efficiency of more than 90%.

• Mature technology and wide application: There are a large number of successful application cases around the world.

• High reliability: The system runs stably.

summary

SCR technology uses ammonia as a reducing agent to efficiently convert harmful nitrogen oxides into harmless nitrogen and water on specific catalysts through the core chemistry of "selective catalytic reduction". It is a complex system engineering involving catalytic chemistry, fluid mechanics, automatic control and other disciplines. Its efficiency and reliability have made it the mainstream and preferred technology for deep denitrification in coal-fired power plants and industrial furnaces worldwide, making great contributions to improving atmospheric environmental quality and preventing photochemical smog and acid rain.

SCR

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