摘要
以煤气化废水为原料,研究了煤制甲醇工艺气化、变换、合成工段产生的废水及其内含主要组分对成浆性能的影响,通过接触角、Zeta电位和添加剂吸附量探讨了各组分对水煤浆成浆特性的作用机理。结果表明:气化灰水、甲醇废水和变换凝液均对成浆性产生不利影响;有机分子醇类和大量阳离子的存在不利于成浆,阴离子能改善煤浆性能;接触角、Zeta电位和吸附量分析表明,废水中的有机分子醇类优先吸附于煤粒表面,降低添加剂吸附量,对煤粒表面润湿性、电负性产生不利影响;阳离子通过中和煤粒表面电负性及离子间的“桥键”作用使得添加剂吸附过量,导致煤粒吸附水膜变厚,浆体性能下降;阴离子吸附于煤粒表面,替代部分无效添加剂,有利于成浆。
Coal gasification wastewater is used as raw material to study the influence of the wastewater and its main components on the slurry performance in the gasification,transformation and synthesis section of coal to methanol process.The action mechanism of each component on the slurry forming characteristics of coal water slurry was discussed by contact angle,zeta potential and additive adsorption capacity.The results show that gasification ash water,methanol wastewater and shift condensate all have adverse effects on pulpability,organic molecular alcohols and cations are not conducive to slurry formation,but anions can improve the performance of coal slurry.The results of analysis of contact angle,Zeta potential and adsorption capacity show that organic molecules and alcohols in coal gasification wastewater are prefered to be adsorbed on the surface of coal particles,which reduces the adsorption capacity of additives and,which has adverse effects on the wettability and electronegativity of coal particles.By neutralizing the surface electronegativity of coal particles and the“bridge bond”effect between ions,the cation causes the excessive adsorption of additives,resulting in the thickening of water film adsorbed by coal particles and the degradation of slurry performance.Anions adsorbed on the surface of coal particles can replace some invalid additives,which is beneficial to slurry formation.
作者
李磊
何国锋
吕向阳
张孝雨
徐彤
LI Lei;HE Guofeng;LYU Xiangyang;ZHANG Xiaoyu;XU Tong(China Coal Research Institute, 100013 Beijing;China Coal Technology and Engineering Group Clean Energy Company Limited Department, 100013 Beijing)
出处
《煤炭转化》
CAS
CSCD
北大核心
2021年第1期65-71,共7页
Coal Conversion
基金
国家重点研发计划项目(SQ2019YFC190292).
关键词
水煤浆
煤气化废水
模拟组分
成浆性能
coal water slurry
coal gasification wastewater
analog components
slurring property
