On March 14, the 14th China Cement Industry Summit and TOP100 Award Ceremony hosted by China Cement Network was held in Hangzhou. Qi Yanyong, an associate professor of Southwest University of Science and Technology, shared the theme report "Judgment and Optimization of Decomposing Furnace Conditions" with the participants.
Qi Yanyong said that at present, the decomposition rate of raw materials entering the kiln in the pre-decomposition kiln system can mostly reach 93%. The outlet temperature of the decomposition furnace is actually controlled in the range of 860-880 ℃, and there are O O and CO at the outlet. This phenomenon leads to the high temperature of the exhaust gas from the primary cylinder. From the theoretical calculation and practical production optimization and transformation practice, in the existing cement precalciner kiln process, if the outlet temperature of the precalciner is controlled at 850 ℃, it is enough to ensure the complete decomposition of calcium carbonate. Moreover, for the high efficiency calciner, the exhaust gas temperature of the first stage cylinder corresponding to the five-stage preheater should be lower than 300 ℃, and that of the six-stage preheater should be lower than 240 ℃.
Qi Yanyong pointed out that the heat transfer capacity of the rotary kiln is proportional to the flame temperature and the fourth wind. Concentrated and rapid combustion of pulverized coal is the best way to increase the temperature of the firing zone and the most effective way to reduce coal consumption. Stable thermal system is an inevitable requirement to reduce energy consumption. It is a feasible way to realize the efficient operation of rotary kiln by intelligent identification of kiln and grate cooler working conditions, real-time monitoring and adjustment of relevant parameters.
浙公网安备33010802003254号