摘要
以煤气化细灰为固相颗粒物料,研究了旋液分离器对含一定细灰黑水的液固分离特性,考察了不同操作参数对不同粒径细灰颗粒分离效率的影响规律。研究结果表明,对10μm以下的细灰颗粒,入口流速、分流比和入口颗粒浓度对不同粒径细灰颗粒的分离效率均有较大影响。对5.012μm以下颗粒,随入口流速的增加,分离效率先减小后略有增大,粒径越小、分流比越大,该趋势越显著;当粒径介于5.012-10μm之间,分离效率随入口流速逐渐增大。10μm以下的细灰颗粒,随分流比的增加,分离效率近乎呈线性增加趋势,并无最佳分流比出现;随入口颗粒浓度的增加,分离效率略有增加。对10μm以上的细灰颗粒,随颗粒粒径的增加受入口流速、分流比和入口颗粒浓度影响逐渐显著。在旋液分离器内,存在明显的小颗粒团聚现象,表现为当颗粒粒径〉30.2μm时,分离效率已出现超过100%的情况。利用实验结果拟合出旋液分离器对煤气化细灰分离粒度的预测公式,该公式预测值与实验值吻合良好。
Separation performance of ash-containing wastewater in a hydrocyclone was investigated experimentally with coal gasification fine ash as experimental medium. The influence of operation parameters on classification separation efficiency was demonstrated in different operating conditions. The results show that inlet velocity, split ratio and inlet particle concentration all have significant effect on separation efficiency for particles smaller than 10μm. With increasing inlet velocity, separation efficiency decreases at first and then increases slightly for particles smaller than 5.012μm. Besides, the smaller particle size and larger split ratio is, the more significant separation efficiency changing trend is. For particles among 5.012~10μm, separation efficiency increases with the inlet velocity. Under the experimental condition, separation efficiency increases almost linearly with that split ratio, while the optimum separation efficiency does not appear for particles smaller than 10μm. With increasing inlet particle concentration, separation efficiency increase slightly. For particles larger than 10μm, the effects of inlet velocity, split ratio and inlet particle concentration on separation efficiency are gradually significant with the increase of particle size. Especially, separation efficiency appears to above 100% for particles larger than 30.2μm due to the interaction between the particles causing agglomeration in the process of swirling. A correlation has been developed to predict ash particle cut size in hydrocyclone. The predicted values agree well with the experimental values.
作者
朱诗杰
陈雪莉
钱玙歆
陆海峰
龚欣
ZHU Shijie;CHEN Xueli;Qian Yuxin;LU Haifeng;GONG Xin(Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education（East China University of Science ＆ Technology）,Xuhui District,Shanghai 200237,Chin)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第13期3873-3880,共8页
Proceedings of the CSEE
基金
中国石油化工股份有限公司科技开发项目(416045)~~
关键词
旋液分离器
气化细灰
分离效率
分离粒度
hydrocyclone
coal gasification free ash
separation efficiency
separation size
