钙基脱硫灰在石灰石-石膏湿法脱硫系统中的应用  

Application of calcium-based desulfurization ash in limestone-gypsum wet desulfurization system

作　　者：李乃霞 韩飞 刘翠甜 LI Naixia;HAN Fei;LIU Cuitian(Baosteel Zhanjiang Iron and Steel Co.,Ltd.,Zhanjiang 524074,Guangdong,China)

机构地区：[1]宝钢湛江钢铁有限公司,广东湛江524074

出　　处：《烧结球团》2024年第1期113-118,共6页Sintering and Pelletizing

摘　　要：钙基脱硫灰的资源化利用一直是行业应用难题。本文为验证钙基脱硫灰替代石灰石-石膏湿法脱硫系统原用脱硫剂(石灰石粉)的脱硫效果,进行在混合脱硫剂中添加不同比例钙基脱硫灰的实验室和工业应用试验,分析脱硫效率、SO_(2)排放质量浓度、吸收塔浆液和石膏的化学成分、脱硫污泥量等主要工艺参数的变化情况,并对钙基脱硫灰添加前、后湿法脱硫系统的生产运行方式变化进行对比分析。结果表明:当钙基脱硫灰替代占比在50%以下时,吸收塔浆液的化学成分基本没有发生变化,系统脱硫效率均在95%以上;SO_(2)排放质量浓度均在10 mg/Nm 3以下,小于35 mg/Nm^(3)的国家排放标准,满足行业超低排放要求;石膏的化学成分基本没有发生变化,满足石膏的社会化应用标准;污泥产生量没有增加,吸收塔内的Cl-浓度有所上升但可通过增大废水排放量来解决;湿法脱硫系统的操作调整变化不大,运行成本没有明显增加。采用钙基脱硫灰替代石灰石粉可为干法、半干法脱硫灰的综合利用提供一种经济、环保的有效途径。The resource utilization of calcium-based desulfurization ash has always been an application problem in the industry.In order to verify the desulfurization effect of calcium-based desulfurization ash instead of the original desulfurizer(limestone flour)of limestone-gypsum wet desulfurization system,laboratory and industrial application tests of adding different proportions of calcium-based desulfurization ash to the mixed desulfurization agent are carried out,and the changes of such main process parameters as desulfurization efficiency,SO_(2) emission mass concentration,chemical composition of absorption tower slurry and gypsum,as well as the amount of desulfurization sludge are analyzed,and the changes in the production and operation mode of the wet desulfurization system before and after the addition of calcium-based desulfurization ash are compared and analyzed.The results show that when the replacement ratio of calcium-based desulfurization ash is below 50%,the chemical composition of the absorption tower slurry basically does not change,and the system desulfurization efficiency is above 95%;the SO_(2) emission mass concentration is below 10 mg/Nm 3,less than the national emission standard of 35 mg/Nm^(3),meeting the ultra-low emission requirements of the industry;the chemical composition of gypsum has basically not changed,meeting the social application standards of gypsum;the amount of sludge produced has not increased,and the Cl-concentration in the absorption tower has increased,however,this can be solved by increasing the amount of wastewater discharged;the operational adjustment of the wet desulfurization system has not changed much,and the operating cost has not increased significantly.The use of calcium-based desulfurization ash instead of limestone flour can provide an economical,friendly and effective way for the comprehensive utilization of dry and semi-dry desulfurization ash.

关 键 词：钙基脱硫灰 石灰石粉 湿法脱硫系统 资源化利用 

分 类 号：TF09[冶金工程—冶金物理化学] TF046.6