磁化水对燃煤PM2.5润湿性的影响  

Effect of magnetized water on wettability of coal-fired PM2.5

作　　者：张园园[1] 张军[1] 尹杰[1] 闾荔 Zhang Yuanyuan;Zhang Jun;Yin Jie;Lü Li(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2020年第5期904-911,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51876038).

摘　　要：为了研究磁化水对燃煤PM2.5润湿性的改善效果,测定了不同磁感应强度和磁化时间下4种水溶液的表面张力及其对4种典型燃煤PM2.5的接触角大小,计算了燃煤PM2.5的临界表面张力,并进行了水磁化后细颗粒物的水汽凝结长大实验.结果表明:在实验条件范围内,磁化作用能够降低水的表面张力及其对细颗粒物的接触角,并与磁感应强度成多极值增减变化关系,与磁化时间成负相关;在磁感应强度700 mT、磁化时间60 min时,磁化水对颗粒润湿性改善效果最佳;燃煤PM2.5典型成分Al2O3、CaSO4、SiO2和Fe2O3的临界表面张力范围分别为52.7~56.3、48.6~55.7、42.2~48.9和50.1~54.2 mN/m;磁化水可有效提高燃煤PM2.5在低过饱和水汽环境中的核化长大效果.In order to study the effect of magnetized water on improving the wettability of PM2.5 in coal combustion,the surface tension of four aqueous solutions under different magnetic intensities and magnetization time and the contact angles of the water to typical coal-fired PM2.5 were measured,and the critical surface tension of coal-fired PM2.5 was calculated.The water vapor condensation growth experiment of fine particles after water magnetization was carried out.Experimental and calculation results show that the surface tension of water and its contact angle to fine particles can be reduced by magnetization under the experimental conditions,which varies with the magnetic intensity in multi-extreme values and is negatively correlated with magnetization time;the effect of magnetized water on the fine particle wettability is best when the magnetic intensity is 700 mT and the magnetization time is 60 min;the ranges of critical surface tension of Al2O3,CaSO4,SiO2 and Fe2O3 are 52.7 to 56.3,48.6 to 55.7,42.2 to 48.4,and 50.1 to 54.2 mN/m,respectively.Magnetized water helps to effectively improve the nucleation growth effect of coal-fired PM2.5 in a low supersaturated water vapor environment.

关 键 词：磁化水 细颗粒物 润湿性 表面张力 接触角 临界表面张力 

分 类 号：TK16[动力工程及工程热物理—热能工程]