煤质技术2021，Vol.36Issue(3)：48-53,6.DOI:10.3969/j.issn.1007-7677.2021.03.007
高温煤焦油电脱盐影响因素研究
Study on the influence of desalination factors for high-temperature coal tar
摘要
Abstract
All inorganic salts usually present in water droplets in coal tar,which play a key role during equipment cor-rosion. It is very important to remove these salts to prevent corrosion. It has already mature for the desalination technol-ogy of crude oil. Therefore,the crude oil desalination technology is generally used to carry coal tar desalination. But be-cause of the great differences in structure and properties between coal tar and crude oil,the application of crude oil de-salination technology in coal tar has many questions. A high temperature coal tar was used in this research to explore the impact of operational desalting parameters. In order to obtain optimum static desalting results,seven kinds of de-mulsifiers were used,in of which,five were organic amine demulsifier,and the others were block polyether demulsifier. Different operating parameters were explored to find the optimal desalting conditions,such as the temperature,the pH of water and the demulsifier injection rate. The results indicate that,to get a higher desalting efficiency for this high temperature coal tar,the block polyether demulsifier has a better demulsification efficiency than those of organic a-mine. The temperature range of 125℃ to 135℃ is required. The maximum dehydration rate occurs both in acidic and alkaline environments. The suitable pH value is 2 and 11 respectively. Using the optimal conditions obtained above,a field tests on a tar enterprise was conducted at different demulsifier injection rates. An optimum separation rate of 79. 2％ was obtained when the demulsifier injection volume was 90 mg NaCl/kg,and the salt content decreased from 25 mg NaCl/kg to 5. 2 mg NaCl/kg. Thus,the technical requirements of coal enterprises could be met.关键词
高温煤焦油/反乳化作用/电脱盐影响/乳化稳定性/无机盐/脱水速率Key words
high temperature coal tar/demulsification/effect of electric desalination/emulsification stability/inorganic salt/dehydration rate分类
化学化工引用本文复制引用
常秋连..高温煤焦油电脱盐影响因素研究[J].煤质技术,2021,36(3):48-53,6.基金项目
The project was supported by the National Key Research and Development Program of China(2017YFB0602803) （2017YFB0602803）
