TEXT Wang Yonggang¹, Senior Engineer, Zhao Liqing², Senior Engineer, Fan Daorong², Professor of Engineering, Cheng Zhaohuan², Senior Engineer, Lei Yunlu², Engineer, Tang Xinyu², Professor of Engineering ¹Tianjin Sinoma Engineering Research Center Co. Ltd., Tianjin/China ²Tianjin Cement Industry Design & Research Institute Co. Ltd., Tianjin/China