SCR (Selective Catalytic Reduction) is currently the most widely used flue gas denitrification technology internationally; This technology is widely used in most power plants in countries and regions such as the United States, Europe, and Japan. The basic principle of selective catalytic reduction (SCR) is to utilize ammonia (NH)₃Regarding NO_xThe reduction function of, using ammonia gas (NH)₃）As a reducing agent, ammonia with a volume concentration of less than 5% is sprayed into the flue gas at a temperature of 320-420 ° C through an ammonia injection grid (AIG), and mixed with N in the flue gas_xAfter mixing, it diffuses to the surface of the catalyst, and under the action of the catalyst, ammonia gas (NH)₃）Remove NO and NO from the flue gas₂Reduced to pollution-free nitrogen gas (N₂）And water (H₂Here, "selectivity" refers to the selective interaction between ammonia and NO in the flue gas_xPerform reduction reaction without reacting with a large amount of O in the flue gas₂effect. The control link of the entire reaction is the diffusion of flue gas in the laminar flow zone on the catalyst surface and within the catalyst micropores.

Denitrification of flue gas from coal-fired power plants Chemical enterprises Denitrification of flue gas from steelmaking blast furnaces, etc.

4NO+4NH₃+O→4N₂+6H₂O

6NO₂+8NH₃+O→7N₂+12H₂O

NO+NO₂+2NH₃→2N₂+3H₂O

★ High denitrification efficiency; The general NOX removal rate can reach over 90%;

★SO₃Low oxidation rate, minimal ammonia escape, and decreased pressure;

The structure of the process equipment is simple, compact, mature, stable, and easy to maintain;

★ It will not have any impact on the boiler and has low risk;

★ It is not affected by the type of power plant furnace and the type of coal used, and has a wide adaptability.

Selective Non Catalytic Reduction (SNCR) for NO Removal_xTechnology is to incorporate NO_xThe basic reducing agent (such as liquid ammonia, ammonia water, or urea) is sprayed into the furnace at a temperature of 850~1200. In the region of C, the reducing agent rapidly decomposes into NH through thermal decomposition₃And other by-products, followed by NH₃NO in smoke_xPerform SNCR reaction to generate N2 and H₂0

Use coal-fired power plant boiler flue gas denitrification, cement kilns, steelmaking blast furnaces, chemical enterprise flue gas denitrification, etc.

The denitrification efficiency is between 40% and 70%;

★ Small required space, fast and convenient implementation;

★ Low initial investment and operating costs;

★ Choose liquid ammonia, ammonia water, or urea as reducing agents.