An Evaluation Method for Combustion Characteristics of Coal in Cement Industry.pdf

Vol.25 No.1 TAO Congxi et al: An Evaluation Method for Combustion… 174 DOI 10.1007/s11595-010-1174-9 An Evaluation Method for Combustion Characteristics of Coal in Cement Industry TAO Congxi1,2, ZHAO Lin1, YU Weimin2, LIU Ruizhi2, HU Zhijuan2, QIAN Qiulan2 (1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; 2. Tianjin Cement Industry Design and Research Institute Co, Ltd., Tianjin 300400, China) Abstarct: As the coal combustion behaviors are rather complex in the cement industry, the traditional assessment method cannot be directly applied to evaluate the quality of coal. Based on the thermal analysis tests of more than 80 kinds of anthracite and bituminous coal, three evaluation pa- rameters, namely, burning intensity (I), average capacity of heat release (Q), and general burning index (S) are presented, combining with the consideration of application and calciner types in the cement industry. Taking these three parameters into consideration together is necessary. Experimental results show that the coal with higher S, lower I and higher Q can be rated as the best for the calciner in the cement industry. The quantitative indexes are given to evaluate the bituminous coal and anthracite in this paper. This new assessment method has implications for the design of calciner in the cement in- dustry. Key words: coal; burning intensity; average capacity of heat release; general burning index; calciner 1 Introduction In the process of new dry cement manufacturing, coal combustion and decomposition of carbonate occur in the calciner of the new suspension preheater (NSP). The heat of coal combustion supplies the energy to the de- composition of the carbonate. The condition of coal burning affects the calciner’s heat release capacity and kiln’s clinker production. As the situation of energy is getting worse and worse, anthracite coal has been in- creasingly used in the cement industry. Ho