摘要
利用搭建的原子力显微镜(AFM)黏附力测试平台,选取典型湿法脱硫净烟气中的细颗粒制备颗粒探针,研究分析了膜吸收CO_2过程中,飞灰颗粒和脱硫石膏颗粒对聚丙烯(PP)膜的污染机理;在相对湿度为0～85%的气氛下,测量了单个SiO_2颗粒和石膏颗粒与PP膜及颗粒间的黏附力,考察了表面粗糙度、相对湿度(RH)、颗粒物性等对黏附力的影响。结果表明:干燥条件下,膜表面粗糙度对颗粒在其上的黏附力影响不大;然而潮湿环境下黏附力受环境湿度影响较大,随着RH不断增加,SiO_2和石膏颗粒对膜的临界黏附力随RH的升高逐渐增加;潮湿条件下颗粒间的黏附力远大于颗粒与膜表面的黏附力,表明颗粒-颗粒的黏附作用可加速颗粒在膜表面的粘附沉积,导致严重的膜污染。
Membrane fouling mechanism was investigated using atomic force microscopy.The adhesion force of a single SiO2 particle and gypsum particle on polypropylene membrane was measured under relative humidity(RH)of 0~85%.Effects of surface roughness,RH and particle properties on adhesion were investigated.The results indicate that surface roughness has few effects on adhesion force under dry conditions.However,surrounding humidity has obvious effects on adhesion force under humid environment.The adhesion forces of fly-ash and gypsum particles increase gradually with the increase of RH.The adhesion forces between particles are much higher than that of SiO2 to membrane,which contributes the most to the fouling of particles on membrane.
作者
张琳
孙莹
杨林军
ZHANG Lin;SUN Ying;YANG Lin-jun(Key Laboratory of Coal-Based CO2 Capture and Geological Storage,China University of Mining and Technology,Xuzhou 221008,China;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第1期91-95,共5页
Journal of Chemical Engineering of Chinese Universities
基金
江苏省煤基CO2捕集与地质储存重点实验室开放基金(2016A05)
