摘要:
测定了不同结构特性活性炭对烟气羰基化合物的过滤效率,讨论了活性炭结构特性及烟气化合物性质对烟气过滤效率的影响.结果表明:1)活性炭的过滤效率主要与活性炭的比表面积和微孔容积有关,在用量一定的情况下,微孔含量越多、比表面积越大,则过滤效率越高;2)过滤效率受孔径分布的影响,不同的孔在吸附中所起的作用不同,微孔滞留小分子的能力强,在气相吸附中起主要的吸附作用,同时微孔传质阻力大,在微孔含量接近的情况下,适当增加大中孔等过渡孔有利于化合物的吸附;3)在不显著增加滤嘴吸阻的前提下,活性炭的粒度越小越好;4)过滤效率与化合物的分子量和沸点密切相关,在不受传质阻力限制的情况下,化合物的沸点越高,则过滤效率越高.
Abstract:
The adsorption efficiency of carbonyls of different structure properties activated carbons were tested,the influence of carbon structure and compounds properties on the adsorption efficiency was discussed.The results showed that: 1)Surface area and micropore volume were the main factors influencing the adsorption efficiency.With the fixed carbon weights,adsorption efficiency increased with the increasing surface area and micropore volume.2)Adsorption efficiency was affected by carbon pore distributions.In the gas adsorption,micropores are contributed to the adsorption straightly,while mesopores and macropores acted as transport pores,providing routes into the adsorbing material;adsorption efficiency could be maximized by a combination of micropores and meso/macropores.3)As long as the filter pressure drop wasn't too high and considering the processing feasibility,carbon particle size could be small enough.4)Adsorption efficiency had something to do with compounds characteristics,especially with compounds' molecular weight and boiling point.When transportation wasn't limited,compounds with higher boiling points had the higher adsorption efficiency.
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