固阀塔板对煤气化飞灰洗涤净化性能的实验研究  

Performance Characteristics of Coal Gasification Fly-ash Scrubbing by Fixed Valve Washing Tower

作　　者：王清立[1] 陈雪莉[1] 郭志国[1] 龚欣[1] 

机构地区：[1]煤气化及能源化工教育部重点实验室(华东理工大学),上海市徐汇区200237

出　　处：《中国电机工程学报》2013年第2期31-38,8,共8页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2007AA050301)~~

摘　　要：以煤气化飞灰、空气、水为实验介质,研究了固阀塔板的洗涤特性。通过改变洗涤塔入口和塔内操作条件观察其对洗涤效率的影响规律。实验结果表明气量、液量、颗粒浓度以及塔板数对不同粒径飞灰颗粒的洗涤效率均有较大的影响;固阀塔板对大于10μm的飞灰颗粒洗涤效率可以达到90%以上,随着粒径的降低洗涤效率逐渐降低,颗粒粒径在1～3μm之间洗涤效率最低为52%左右;低于1μm的颗粒,随着粒径的降低洗涤效率逐渐升高。不同粒径飞灰颗粒的洗涤效率随气量增加呈现不同的变化趋势,其中3μm以上颗粒的洗涤效率随气量的增加而增大;而1μm以下颗粒的洗涤效率随着气量的增加,洗涤效率逐渐降低;介于1～3μm间的颗粒洗涤效率受气量变化影响较小。不同粒径颗粒的洗涤效率随液量的增加均增大;随入口颗粒浓度增加,5μm以上颗粒洗涤效率略有增加,但3μm以下颗粒随入口颗粒浓度的增加洗涤效率却显著降低,介于3～5μm之间的颗粒洗涤效率变化不大。各层塔板对飞灰颗粒洗涤效率的贡献不同,且在不同层塔板上洗涤效率随粒径变化的趋势也有较大的差异。利用实验结果拟合出预测板式塔洗涤效率的公式,该公式预测值与实验值相符程度较好。The scrubbing characteristics of coal gasification fly-ash in a fixed valve tray washing tower was investigated experimentally with fly-ash, air and water as experiment medium. The influence of operating parameters on washing efficiency was demonstrated for different operating conditions. The experimental results indicate that gas flow rate, liquid flow rate, fly-ash particle concentration and plate number have considerable effects on washing efficiency. For particles which are larger than 10 p.m, the washing efficiency can achieve above 90%. With decreasing particle size the washing efficiency decreases and the minimum value 52% appears among 1 and 3 p.m. With increasing gas flow rate, the trends of washing efficiency for different particle size vary obviously. For particles which are larger than 3μm, the washing efficiency increases with gas flow rate, while for particles which are smaller than 1 μm, the washing efficiency decreases with increasing gas flow rate, for particle size between them, the washing efficiencies have no obvious change. The washing efficiencies of all particles increase with liquid flow rate. With increasing inlet particle concentrations, for particles which are larger than 5μm the washing efficiencies increases slightly while for particles which are smaller than 3 μm, the washing efficiencies decrease apparently and for particle size between them the washing efficiency have no obvious improving. Each tray has different contribution to washing efficiency for the same size particles. Moreover, with increasing particle size, the change trends of washing efficiency are different on different trays. A correlation has been developed for prediction of fly-ash particle washing efficiency in fixed valve tower. The experimental values agree well with the predicted values.

关 键 词：整体煤气化联合循环发电(IGCC) 水洗塔 固阀塔板 洗涤效率 煤气化飞灰 

分 类 号：TQ515[化学工程]