Optimization of Fuel In-Situ Reduction(FISR)Denitrification Technology for Cement Kiln using CFD Method  

作　　者：SHI Chaoting CAI Jun REN Qiangqiang WU Huixing 

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing,100190,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]Dalian National Laboratory for Clean Energy,Dalian,116023,China

出　　处：《Journal of Thermal Science》2023年第6期2256-2272,共17页热科学学报（英文版）

基　　金：This work is financially supported by“Transformational Technologies for Clean Energy and Demonstration”,Strategic Priority Research Program of the Chinese Academy of Sciences(Grant number XDA21040300);Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant number Y201642).

摘　　要：Nitrogen oxides(NO_(x))from cement industry have drawn more and more attention and the existing denitrification technologies can hardly meet the increasingly stringent emission requirements in China.In our previous work,fuel in-situ reduction(FISR)method was proposed to cut cement NO_(x)emission.With the pilot-scale precalciner in the previous experiment as objection,optimization of FISR method was conducted using CFD method.The results demonstrated that NO_(x)emission decreased by 69.86%after adopting FISR method.The effects of initial concentrations of NO and O_(2)in kiln gas,feeding location of the first-stage tertiary(tertiary air-I)and cement raw meal(CRM)were further investigated.With increasing initial NO concentration,NO_(x)emission increased linearly,while the reduction rate of NO in kiln gas maintained above 80%.When O_(2)content in kiln gas is more than 4%,oxygen would more significantly promote the formation of NO_(x)and inhibit the reduction of NO.The dimensionless locations of tertiary air-I and CRM were introduced.The simulation results showed that the optimal dimensionless locations are 0.6 and 1.6 for tertiary air-I and CRM,respectively.The outputs achieved in this study will provide a strong support for the practical application of FISR method in cement industry.

关 键 词：cement industry PRECALCINER pretreated fuel NO_(x)emission DENITRIFICATION 

分 类 号：X781.5[环境科学与工程—环境工程] TQ172.62[化学工程—水泥工业]