大型球团链篦机-回转窑高硫烟气脱硫增效改造设计优化#br#

某200万t/a球团链篦机 回转窑烟气脱硫装置基于单塔单循环石灰石 石膏湿法烟气脱硫技术。随着钢铁行业超低排放的推进和实施，现有的脱硫装置处理能力不能满足新的环保排放要求，需要对原脱硫系统进行增效改造。此次改造采用单塔双循环石灰石—石膏湿法脱硫工艺，在原脱硫吸收塔基础上增高抬升后进行分区喷淋，并增加喷淋层，吸收塔外新增塔外循环浆液箱及配套的循环浆液泵，同时对工艺水系统、石灰石浆液制备供浆系统、氧化压缩空气系统和石膏脱水系统进行相关的配套改造设计。按优化设计进行的脱硫系统增效改造后，脱硫塔出口SO2浓度不大于35 mg/Nm3，雾滴排放浓度不大于50 mg/Nm3。项目实施改造后，污染物二氧化硫排放浓度得到大大消减，达到了超低排放标准，环境效益十分明显。

Design Optimization of Efficiency Improvement of High Sulfur Flue Gas Desulfurization #br# System for Large Pellet Grate Kiln

A 2 million t/a grate rotary kiln flue gas desulfurization unit is based on a single tower single cycle limestone gypsum wet flue gas desulfurization technology.With the promotion and implementation of ultra low emission in the steel industry,the existing desulfurization devices cannot meet the new environmental emission requirements,so the original desulfurization system needs to be improved.The reconstruction using single pylon dual cycle limestone gypsum wet desulphurization process,on the basis of the original desulfurization absorption tower increased partition spray after lifting,and increase the spray layer,the outside of absorber tower increase new external loop slurry box,and the cycle of form a complete set of slurry pump,as well as the process water system for pulp,the limestone slurry preparation system,compressed air system and gypsum dewatering system renovation design of related.After the efficiency enhancement transformation of the desulfurization system according to the optimized design,the SO2 concentration at the desulfurization tower outlet is no more than 35 mg/Nm3,and the droplet emission concentration is no more than 50 mg/Nm3.After the implementation of the project,the emission concentration of sulfur dioxide has been greatly reduced,reaching the ultra low emission standard,and the environmental benefits are very obvious.