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OALib Journal期刊
ISSN: 2333-9721
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燃煤飞灰汞吸附动力学及其模型研究
, PP. 11-18
Keywords: 燃煤飞灰,汞,吸附动力学,动态吸附,速控步骤,表面活性点位,外扩散,粒内扩散
Abstract:
为了更好地了解汞在燃煤飞灰表面上复杂的氧化吸附机制，在固定床反应器上进行了汞吸附实验，采用表观吸附动力学模型对不同工况下的动态吸附过程进行了模拟，并将模拟结果与实验结果进行对比。结果表明：随着吸附环境温度的升高，燃煤飞灰对汞的初始吸附速率先降低后升高，这与准二级吸附速率常数呈现的规律相符；入口气体流量的增加可降低外扩散阻力；入口汞质量浓度的增加可提高传质推动力，促进飞灰对汞的吸附；粒内扩散控制作用较小；bangham动力学模型适用于各种工况下飞灰对汞的吸附，最适合于描述固定床中飞灰对汞的动态吸附过程。
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