湿法脱硫系统中应用水汽相变促进SO3酸雾脱除研究  

Removal of Sulfuric Acid Mist in Limestone Gypsum Desulfurization Processes via Supersaturation Vapor Phase Transition

作　　者：廖永进 余岳溪 张瑞[2] 杨林军[2] 张亚平[2] LIAO Yong-jin;YU Yue-xi;ZHANG Rui;YANG Lin-jun;ZHANG Ya-ping(Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China;Key Laboratory for Energy Thermal Conversion and Control of Ministry of Education, Southeast University,Nanjing 210096, China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广东广州510080 [2]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《高校化学工程学报》2017年第4期970-976,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：南方电网公司科技项目(K-GD2014-173);国家自然科学基金(51576039);国家重点基础研究发展计划(2013CB228505);江苏省科技计划项目(BE2014856)

摘　　要：基于石灰石-石膏湿法烟气脱硫(WFGD)工艺,通过数值计算获得脱硫塔进口烟气温湿度对塔内过饱和水汽环境的影响规律,并试验考察了塔入口烟气参数及脱硫操作条件对SO_3酸雾脱除特性的影响。结果表明,通过调节脱硫塔入口烟气温湿度可使塔内形成SO_3酸雾凝结长大所需的过饱和水汽环境,适当降低塔入口烟温或提高塔入口烟气湿度可有效提高WFGD系统对SO_3酸雾的脱除效果,脱除效率可从40%增至60%左右;同时,适当提高脱硫液气比及降低浆液温度有利于促进SO_3酸雾的脱除,脱除效率可提高10%左右。A novel process was proposed to improve removal efficiency of sulfuric acid droplets byheterogeneous condensation in limestone-gypsum wet flue gas desulfurization system(WFGD).Numericalcalculation results indicate that supersaturation vapor environment is established in the SO2absorption zone byadjusting temperature and humidity of WFGD inlet flue gas.Effects of inlet flue gas parameters and operationconditions of WFGD on the removal efficiency of sulfuric acid droplets were investigated.The results show thatinlet flue gas with high humidity and relatively low temperature is beneficial for the establishment ofsupersaturation vapor environment in the SO2absorption zone,and the removal efficiency can be improvedfrom40%to60%.Furthermore,the removal efficiency of sulfuric acid droplets can also be enhanced byincreasing liquid-to-gas ratio or decreasing desulfurization slurry temperature,where the removal efficiency canbe improved by about10%.

关 键 词：石灰石-石膏法脱硫 SO3酸雾 水汽相变 脱除 

分 类 号：X51[环境科学与工程—环境工程]