摘要
本工作基于燃煤电厂烟气(CO_(2))溶于水形成的碳酸可促进高碱煤中碱金属碱土金属(AAEM)水洗脱除的理论基础,研究了关键工艺参数对脱碱效果的影响规律,考察了洗液循环利用的可行性和烟气强化水洗对重金属的脱除作用。结果表明,烟气强化水洗对红沙泉煤中Na、K最高脱除率分别可达86.8%和62.7%;宜化煤脱Ca率达到44.7%;准东煤脱Mg率达35.4%;脱碱率随水洗时间的增加和原料粒径的减小而增大;洗液盐浓度与循环次数呈正相关,Ca和Mg的脱除率受循环液浓度影响强于Na和K;煤中As、Ni等重金属脱除率甚至超过90%。
Based on the theoretical basis that carbonic acid formed by coal-fired power plant flue gas(CO2)dissolved in water can promote the water washing removal of alkali metals and alkaline earth metals(AAEM)in high alkali coal.In this work,the influence of the critical process parameters on the AAEM removal was studied,and the feasibility of recycling of washing liquid and the removal of heavy metals by flue gas enhanced washing were investigated.The results show that the maximum removal rates of Na and K from Hongshaquan coal by flue gas enhanced water washing can reach 86.8% and 62.7% respectively;The Ca removal rate of Yihua coal reached 44.7%;The Mg removal rate of Zhundong coal is 35.4%.The dealkalization rate increases with the increase of washing time and the decrease of raw material particle diameter;The results show that the salt concentration of the washing solution increases with the increase of the number of cycles,and the removal rates of Ca and Mg are more affected by the concentration of the circulating solution than those of Na and K;The removal rate of As,Ni and other heavy metals in coal is even more than 90%.
作者
王祥曦
马金荣
李建
孙铭跃
马剑飞
王峰
武爱玲
郭丽
魏博
李显
罗光前
姚洪
WANG Xiangxi;MA Jinrong;LI Jing;SUN Mingyue;MA Jianfei;WANG Feng;WU Ailing;GUO Li;WEI Bo;LI Xian;LUO Guangqian;YAO Hong(Key Laboratory of Coal Clean Conversion and Chemical Process Autonomous Region,College of Chemical Engineering,Xinjiang University,Urumqi 830000,China;Xinjiang Xinye Energy Chemical Engineering Co.Ltd,Urumqi 831300,China;State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2023年第3期831-839,共9页
Journal of Engineering Thermophysics
基金
国家自然科学基金地区基金(No.51966017)。
关键词
烟气强化水洗
高碱煤
碱金属和碱土金属
重金属脱除
循环水
flue gas enhanced water washing
high-alkali coal
AAEM
heavy metal removal
circulating water
