SHI Chaoting;CAI Jun;REN Qiangqiang;WU Huixing;MA Haijun;

• 1:Institute of Engineering Thermophysics
• 2:Chinese Academy of Sciences
• 3:University of Chinese Academy of Sciences
• 4:Dalian National Laboratory for Clean Energy

Abstract：

China is the largest cement producer and consumer in the world,and NO_x emission from cement industry has become the third largest emission source since thermal power generation and transportation,which is one of the main reasons causing the haze weather in China. With the improvement of NO_x emission standards in the cement industry,more and more attention has been focused on the low NO_x emission control technologies for coal-fired cement kilns. In order to clearly understand the optimization direction of the common low NO_x emission control technology and the development status of the new low NO_x emission control technologies in the cement industry,and provide references for cement enterprises to achieve ultra clean and green production,the conventional and emerging low nitrogen denitration technologies used in coal-fired cement kilns were summarized and analyzed in this paper. Firstly,in the view of the conventional low nitrogen denitrification technologies in coal-fired cement kilns,the principles,characteristics and application status of these technologies were stated according to the classification of before,during and after the burning of the fuel,and the problems encountered in practical application were further pointed out. And the combined application of various low NO_x emission control technologies before,during and after combustion were also introduced briefly. Secondly,in the view of the emerging low nitrogen denitrification technologies with two-step NO_x reduction method as representative,in this paper,the nitrogen reduction principles and research status of these methods were focused on. And the denitrification efficiencies,research and application status of various low NO_x emission control technologies in cement industry were compared and summarized. Facing the increasing severe situation of emission reduction,it is imperative to carry out the deep denitration work in the cement industry. To this end,in combination with the principles,characteristics and problems of various common low NO_x emission control technologies,the combined application of low nitrogen control technologies during combustion and after combustion were proposed to achieve the purpose of cost reduction and efficiency increase in the cement industry,and some feasible plans for the reconstruction of existing production lines and the construction of new production lines were put forward. Considering the nitrogen reduction principle and development status of various new low NO_x emission control technologies,the future research and efforts of the low NO_x emission control technologies in the cement industry were pointed out. In the future,the development of low NO_x emission control technology in cement industries should pay attention to improving the carbon reduction capacity in reduction atmosphere,and the optimization of the existing technology and the exploration of new technologies should be carried out with the stimulation of carbon reduction capacity as the core. Besides,it was pointed out that the application of precise measurements and control equipment with automation and intelligence should be considered in order to give full play to the denitrification effect of low NO_x emission control technologies with all-round monitoring and feedback system related indicators.

Key Words： rotary kiln;precalciner;NOx;denitrification;SNCR;SCR;two-step reduction method

Abstract:

Keywords:

Foundation: 中国科学院战略性先导科技专项资助项目(XDA21040300);中国科学院青年创新促进会优秀会员资助项目(2012129)

Authors: SHI Chaoting;CAI Jun;REN Qiangqiang;WU Huixing;MA Haijun;

DOI: 10.13226/j.issn.1006-6772.20020401

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