this year, the Ministry of Ecology and Environment, the National Development and Reform Commission, the Ministry of Industry and Information Technology, the Ministry of Finance and the Ministry of Transport have jointly issued the Opinions on Promoting the Implementation of Ultra-low Emissions in the Cement Industry.
The Opinions require that by the end of 2025, significant progress will be made in key regions, 50% of cement clinker production capacity will be transformed, and large state-owned enterprise groups in the region will basically complete the transformation of organized and unorganized ultra-low emissions; By the end of 2028, cement clinker production enterprises in key regions will have basically completed the transformation, and the whole country will strive to complete the transformation of 80% of cement clinker production capacity.
The organized emission control index requires that under the condition of 10% of the benchmark oxygen content, The hourly average emission concentration of particulate matter, sulfur dioxide and nitrogen oxides in the waste gas from the cement kiln and the waste heat utilization system at the kiln tail shall not be higher than 10 mg/m3 , 35 mg/ m3, 50mg/m3。 The release of
this policy has undoubtedly accelerated the pace of ultra-low emission transformation of cement enterprises! In the emission reduction of the three major pollutants in the cement industry, denitrification is undoubtedly costly and difficult. Therefore, it is urgent for cement enterprises to choose a denitrification technology with high denitrification efficiency and low operation cost.
For the denitrification technology of cement industry, in the past few years, a hundred flowers have blossomed, but in recent years, SCR denitrification technology has gradually come to the fore. "At present, SCR technology has become the absolute mainstream technology." An industry insider said frankly that SCR catalytic denitrification technology is an inevitable choice to achieve ultra-low emissions of nitrogen oxides. However, SCR denitrification technology can be divided into high temperature and high dust SCR, high temperature and low dust SCR, medium temperature and medium dust SCR, etc. Each process has a different impact. Summary of
SCR denitrification technology path in
cement industry According to industry insiders, denitrification technology is not the best, only the most appropriate, and the applicable technology should be selected according to the operation of the kiln. Because of the characteristics of high dust, high humidity and complex composition of cement exhaust gas. Comprehensive reflection of two major problems:
① Most systems are the follow-up environmental protection transformation, and the coordination and unity with the original production process system are not considered, resulting in unreasonable increase of system operation cost, and even low operation stability and reliability; The comprehensive denitrification efficiency of ② is low, and many of them adopt excessive ammonia injection in pursuit of low NOx emission, which results in large amount of ammonia escape, serious waste and secondary pollution, and can not achieve more economical and reasonable ultra-low NOx emission. How to choose more suitable denitrification technology for nitrogen oxide treatment in
cement enterprises? On June 13-14, China Cement Network held the "11th China Cement Energy Conservation and Environmental Protection Technology Exchange Conference-Equipment Renewal Forum" in Nanjing, Jiangsu Province, which will compare and analyze the technical routes of ultra-low emission transformation of cement enterprises. After the meeting, we will also organize a visit to Jurong Taini Cement Co., Ltd., a national green factory and a national green mine.
