摘要
脱硫废水蒸发析出盐分会影响飞灰黏性,导致烟道积灰严重。为阐明废水蒸发析出的不同盐分对飞灰黏性的影响规律,采用黏性力测试天平分析了不同工况下飞灰的黏性,并采用扫描电镜分析了样品表面形貌。结果表明:脱硫废水使飞灰黏结强度显著增强,添加脱硫废水的飞灰样品黏结强度是加去离子水灰样的5.1倍;废水镁离子对飞灰的黏结强度影响最大,其中氯化镁样品的黏结强度是加去离子水样品的2.36倍;随样品中含盐量增加,飞灰黏结强度显著增强。微观形貌下观察到脱硫废水蒸发析出的无机盐以簇状团聚物的形式黏附在飞灰颗粒表面,形成包衣结构,颗粒之间形成稳定黏结力,团聚结构紧实。脱硫废水蒸发析出的无机盐增强了飞灰黏性,改变了飞灰表面形貌,诱发飞灰团聚,进而加剧了烟道飞灰沉积。
The evaporation of desulfurization wastewater releases salt,which affects the viscosity of fly ash and leads to serious ash deposition in the flue.In order to clarify the influence of different salts evaporated from wastewater on the viscosity of fly ash,the viscosity of fly ash under different working conditions was analyzed by viscous force test balance,and the surface morphology of the sample was analyzed by scanning electron microscope.The results show that the desulfurization wastewater significantly enhances the bonding strength of fly ash,and the bonding strength of fly ash samples added with desulfurization wastewater is 5.1 times that of fly ash samples added with deionized water.Magnesium ion in wastewater has the greatest influence on the bonding strength of fly ash,and the bonding strength of magnesium chloride sample is 2.36 times that of deionized water sample.With the increase of salt content in the sample,the bond strength of fly ash increases significantly.Under the micro morphology,it is observed that the inorganic salts evaporated from the desulfurization wastewater adhere to the surface of fly ash particles in the form of cluster agglomerates,forming a coating structure,forming a stable bonding force between particles,and the agglomerated structure is compact.In conclusion,the inorganic salts evaporated from desulfurization wastewater enhance the viscosity of fly ash,change the surface morphology of fly ash,induce fly ash agglomeration,and then aggravate the deposition of flue fly ash.
作者
伍权
WU Quan(CHN Energy New Energy Technology Research Institute Co.,Ltd.,Beijing 102209,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第S02期478-482,共5页
Clean Coal Technology
基金
国家重点研发计划资助项目(2018YFB0604300)
关键词
脱硫废水
烟道蒸发
硫酸盐
飞灰
黏附力
desulfurization wastewater
flue evaporation
sulfate
fly ash
adhesion
作者简介
伍权(1968—),男,四川资中人,高级工程师。E-mail:wuquan518@163.com
