中国水泥工业烧成系统技术升级路线图之预分解窑内循环烟气脱硫技术

Sintering System Technology Upgrading Roadmap of China Cement Industry: the Pre-decomposition Kiln Cycle Flue Gas Desulfurization Technology

水泥窑系统中的硫是由原料和燃料带入的。预热器出口的SO_2是原料中的硫在生料预热过程中产生的,而燃料中的硫基本在分解炉或C_5预热器已被吸收完全,生成硫酸盐,最终随熟料排出。干法脱硫技术所需熟石灰价格较高,采用在分解炉取料但生料量不稳定,脱硫效果波动较大;FGB湿法脱硫成本高。而预分解窑内循环烟气脱硫技术是直接采用C_5旋风筒物料,经二级或三级冷却系统冷却,直接喂入C_1旋风筒脱硫。不需购买脱硫剂,封闭运行,无废气排放,不增加窑系统能耗。

The sulfur in cement kiln is brought by raw materials and fuel. The SO_2 from the preheater outlet is generated by the sulfur in the feedstock during the preheating of the raw materials. And the sulfur in the fuel has almost been absorbed completely in the decomposition furnace or C_5 preheater, changed into sulfate, and ultimately discharged with the clinker. Dry desulfurization technology requires slaked lime with higher price, and this technology uses the materials taken from decomposition furnace but the raw material is unstable, so the desulfurization effect fluctuates greatly.The cost of FGB wet desulfurization is high. The predecomposition kiln cycle flue gas desulfurization technology is directly use the materials from C_5 whirlwind, through grade two or three cooling system cooling, then put into C, cyclone desulfurization. By using this technology No desulfurization agent is needed,closed operation, no emission, no extra energy consumption to kiln system is achieved.