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SCR flue gas denitration technology

Selective Catalytic Reduction (SCR) refers to the "selective" Catalytic Reduction (SCR) that reacts selectively with NOx in the flue gas and produces non-toxic and pollution-free N2 and H2O under certain temperatures and catalysts. . The reducing agent may be a hydrocarbon (such as methane, propylene), NH3, urea, and the like.
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Selective Catalytic Reduction (SCR) refers to the "selective" Catalytic Reduction (SCR) that reacts selectively with NOx in the flue gas and produces non-toxic and pollution-free N2 and H2O under certain temperatures and catalysts. . The reducing agent may be a hydrocarbon (such as methane, propylene), NH3, urea, and the like.
CR flue gas denitrification technology has become the most widely used, most mature and most effective flue gas denitrification technology in the world. The SCR technology has remarkable effects on the NOx control of boiler flue gas. It has a small footprint, mature technology, and easy operation. It can be used as one of the main means for controlling NOx pollution in coal-fired power plants in China. However, SCR technology consumes NH3 and catalysts. At present, most of the catalysts we use are dependent on foreign products. Therefore, the cost of catalysts usually accounts for about half of the initial investment in SCR systems. The operating costs are greatly affected by the catalyst life, so there are operating costs. The disadvantage of high equipment investment is big. The main method used for flue gas denitrification is dry process. The reason is that NOx is less chemically active than SO3 and it is difficult to be dissolved and absorbed by aqueous solutions. NOx is reduced to non-toxic N2 and H2O, and the by-products of denitration are easily handled.
SCR and SNCR have achieved good commercial applications in large-scale coal-fired power plants, of which SCR has hundreds of successful applications and more than 10 years of operating experience worldwide, and 95% of Japan's and Germany's flue gas denitration devices use SCR. Technology, this method is mature technology, high denitrification rate, almost no secondary pollution.
Activated carbon has a well-developed microporous structure and a large specific surface area, and has a relatively strong adsorption capacity for NOX and SO2 in flue gas. The activated carbon adsorption method can not only denitrate but also desulfurize simultaneously. The removal of SO2 in this process is better than the removal of NOX. In the flue gas containing high concentrations of SO2, the activated carbon performs the SO2 removal reaction. In the smoke with low SO2 concentration, the NOx removal reaction dominates and the removal rate is high. Activated carbon technology can achieve more than 98% of SO2 removal rate and 80% of NOX removal rate under long-term continuous and stable operation.