基于CSCR+SNCR烟气净化技术的链-回-环氧化球团热工优化

Optimization of Thermal Regime of Traveling Grate-Rotary Kiln-Circular Cooler Oxidized Pellet Production Based on CSCR and SNCR Flue Gas Purification Technology

通过对CSCR、SNCR烟气净化设施的运行特点及存在问题分析,提出了适应目前CSCR+SNCR联合烟气治理流程在链-回-环氧化球团产线的控制模式,解决了活性炭板结、氮氧化物控制困难、还原剂消耗高、粉尘排放指标高的运行瓶颈;对链箅机、环冷机等关键温度的长周期跟踪分析证明,链箅机西1#烟罩温度介于940~955℃,回转窑料温介于1120~1150℃能够将氮氧化物排放指标控制在25 mg/Nm^(3)以下。最终稳定实现日产量提升316 t、氨水单耗降至1.6 kg/t、高硫低价矿配吃比例提升的目标,高炉炼铁焦比下降1.32 kg/t。

Through the analysis of the operational characteristics and existing problems of CSCR and SNCR flue gas purification facilities,a control mode suitable for the current CSCR and SNCR combined flue gas treatment process in the traveling grate-rotary kiln-circular cooler pellet production line is proposed,which solves the operating bottlenecks of activated carbon agglomeration,difficulties in nitrogen oxide control,high consumption of reducing agents,and high dust emission indicator.The long-term tracking analysis of key temperatures such as those of the grate machine and circular cooler prove that when the temperature of the west No.1 hood of the grate machine is between 940 to 955℃,and the temperature of the material in rotary kiln is between 1120 to 1150℃,the nitrogen oxide emission index can be controlled below 25 mg/Nm^(3).Eventually,the goals of increasing daily output by 316 t,decreasing ammonia consumption to 1.6 kg/t,increasing the ratio of high-sulfur low-priced ores are achieved.The coke ratio in blast furnace iron-making decreases by 1.32 kg/t.