| Nitrogen oxides is one of the main pollutants in the atmosphere and the main reason for acid rain and Chemical fumes. So far, various countries around the world have developped many types of government technology about flue gas nitrogen oxides. Selective Catalytic Reduction is widely used in the large coal-fired power plant. High in efficiency,mature in technology and almost no secondary pollution, this method becomes the domestic flue gas denitrification project focal poin in introduction, digestion and using. First, comprehensive comparative analysis is made in denitration technology. Based on the actual situation of G power plant, combined with the SCR technology, four denitration technologies are selected as alternative solutions. Establishing corresponding index system,this paper makes a comprehensive evaluation of four options by fuzzy triangular number FEAHP methods, SCRtechnology is selected for G power plant transform. Second, denitration reconstruction for the thermal power plant G, containing flue gas system and the reactor system 13 main systems, is introduced in this paper. After the installation and a comprehensive acceptance inspection, the key points in the process of installation design is put forward. The testing results show that the various indexes of the system meet the first design requirements and local emission standards for nitrogen oxides, and that the project reconstruction makes the remarkable effect. Through the analysis of reconstruction situation and commissioning results, this paper proposes particular concern items of the equipment selection, system optimization,commissioning,operation in the process of old factory denitration and environmental protection comprehensive reform. These items for the equipment selection and optimization and the reducing risk of denitrification reconstruction have the certain reference significance.
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