改性粉煤灰基吸附剂烟气脱汞  

Flue gas demercuration by modified fly ash based absorbent

作　　者：郑慧敏[1] 刘清才[1] 王铸[1] 孟飞[1] 牛德良[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《环境工程学报》2015年第9期4453-4457,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50774107)

摘　　要：改性粉煤灰基吸附剂作为烟气脱汞吸附剂,具有成本低的特点。为进一步研究改性粉煤灰基吸附剂脱汞的工业运行状况,设计了最大烟气流量为2 000 Nm3/h的中试实验。首先通过数值模拟方法研究燃煤烟气过程中吸附剂脱汞性能,分别研究了吸附剂粒径、烟气流量以及吸附剂料层厚度对脱汞效率的影响。研究发现,随着烟气流量的增加脱汞效率降低,烟气流量为2 000 Nm3/h时脱汞效率为74.26%。在中试实验中采用三段式脱汞工艺,脱汞吸附剂为卤素元素浸渍改性的粉煤灰基吸附剂,根据模拟结果设计了吸附剂粒径为25 mm,料层厚度为400 mm的实验参数。实验结果表明,三段式脱汞工艺在烟气流量为2 000 Nm3/h,其脱汞效率为78.8%,其中吸附剂的脱汞效率为68.90%,证明了改性粉煤灰基吸附剂在工业烟气脱汞工艺中具有良好作用。It has a low-cost superiority that modified fly ash based absorbent（ MFABA） removes mercury from flue gas. Aim to study the demercuration ability of MFABA under industrial operating conditions further,a pilot plant with the maximum flue flow of 2 000 Nm3/ h was established in this investigation. Firstly numerical modeling method was offered to study the function of MFABA,we studied the influences of different particle sizes of MFABA,flue flow and thickness bed on mercury removal efficiency. Modeling results show that with the increasing of flue flow the mercury removal rate decreased,and the demercuration rate was 74. 26% when the flue flow was 2 000 Nm3/ h. In industry experiment,the mercury remove technology was a three-section type process.Based on the modeling results,MFABA with the size of 25 mm was offered as the absorbent for demercuration,and the thickness bed of absorbent was set as 400 mm. The results suggest that the total mercury removal rate of this technology was 78. 8% while the demercuration rate of MFABA absorbing process was 68. 9%. This research and its results further prove that the MFABA is applicable in industrial flue gas demercuration.

关 键 词：粉煤灰基吸附剂 脱汞 中试实验 

分 类 号：X701.2[环境科学与工程—环境工程]