不同电场飞灰对汞的吸附特性及富集规律研究
Study on mercury adsorption features and enrichment law of fly ash with different electric fields
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摘要: 为了实现廉价飞灰基汞吸附剂的开发,分析了某燃煤电厂静电除尘器不同电场飞灰汞含量,并在固定床上开展了汞吸附性能评价试验。结果表明:不同电场飞灰对汞富集能力先增加再减小,富集过程更可能是以氧化态汞的形式富集在飞灰表面。电场1的飞灰中未燃尽碳含量高,与汞的接触机会多,表现出较强的汞吸附能力;其他电场飞灰汞吸附性能和物化特性未呈线性关系,吸附过程受多个因素影响。Lagergren准一级动力学模型更适合预测电场飞灰汞吸附过程,颗粒外气膜扩散影响较大。另外,通过平衡吸附量占有率考察飞灰在烟道中对汞的富集及其进一步脱汞的潜力,得到电场1的飞灰最适合作为吸附剂脱除烟气中的汞。Abstract: in order to realize the development of a low cost fiy ash based mecury adsorbent.the paper analyzed the mercury conients of the fy ash with aifferent eectric fields in an electrostatic precipitator of a coa-fred power plant and an evaluation experiment ofthe mercury adsorptio peromances was conducted on the ficedbed. The results showed that the mercury enichment capacity of the fiy ash with oifferent lectricfeds would be frit y increased and then reduced and during the enichment pocess.,the mercury woauldpossibly be enriched on the surtace ofthe fy ash with an oxidation state mercury mode.The conten of the not combusted caon inthefly ash of No.1 electric field was high and the fy ash would have many contact chanceswith mercury and would show a igh adsoption capactyof mercur y.The mercury adsorption performances and physichenical features of the fy ash in other elecric fiels wouid not be in a liear relationship and the adsoption po.s oud be affcted by several factors.Lagergren pseudofrt orderdynamics model would be more suitable to predicthe mecury adsorption prcess of the fy ash in the electric feld and the extem al gas fi o fise infuence of the fiy ash paric es were igh. /n a tion.an occupied rate of the balanced adsorption volume was applild to investigate the mercury enrichment and the further mercury removal potential of the fly ash in the flue.And the fy ash obtained in No.1elcric field would be the most sutable to be adsorbent to remove mercury from flue gas.
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Keywords:
- coal-fired fly ash /
- electric field /
- mercury enrichment /
- adsorption capacity
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