影响工业废气的吸附原因有哪些?
For industrial waste gas, there are many factors affecting its adsorption, such as adsorbent, adsorbent concentration, operating conditions and adsorbent properties.
(一)吸附剂对工业废气吸附的影响:我们在衡量吸附剂的吸附能力时有一个概念是有效表面积,有效表面积是指吸附质分子能够进入的表面积,随着吸附剂表面积的增加,被吸附气体的总量也会随着增加。吸附剂的孔径及颗粒度、孔隙率等都影响着比表面积的大小。
(1) Influence of adsorbent on industrial waste gas adsorption: when we measure the adsorption capacity of adsorbent, we have a concept of effective surface area, which refers to the surface area that adsorbate molecules can enter. With the increase of adsorbent surface area, the total amount of adsorbed gas will also increase. The specific surface area is affected by the pore size, particle size and porosity of adsorbent.
(二)吸附质的浓度对工业废气的影响:吸附质在气箱中浓度越大吸附量也就会越大,但同时吸附质的浓度大又会使得吸附剂很快就会发生饱和,从而对于再生也很频繁,所以吸附法不适合用来净化污染物浓度高的气体。
(2) Influence of adsorbent concentration on industrial waste gas: the higher the concentration of adsorbent in the gas box, the greater the adsorption capacity. But at the same time, the higher the concentration of adsorbent will make the adsorbent saturate quickly, so the regeneration is also very frequent. Therefore, the adsorption method is not suitable for purifying the gas with high pollutant concentration.
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(三)操作条件对工业废气吸附的影响:操作条件主要是指压力及气体的流速、温度等,物理吸附在低温条件下会对吸附有利,而在化学吸附的过程中,需要提高温度才能对其有利。从理论上来说,增加压力对于吸附是有力的,但是压力过高会增加能耗且在操作的方面还有更高的要求,所以在实际的工作中通常不提倡这种方法。
(3) Influence of operating conditions on industrial waste gas adsorption: operating conditions mainly refer to pressure, gas flow rate, temperature, etc. physical adsorption will be beneficial to adsorption at low temperature, while in the process of chemical adsorption, it needs to increase the temperature to be beneficial. Theoretically, increasing pressure is powerful for adsorption, but too high pressure will increase energy consumption, and there are higher requirements in operation, so this method is usually not advocated in practical work.
(四)吸附性质对于工业废气的影响:在除了吸附质分子的临界直径之外,吸附质的沸点、饱和性及相对分子质量等也对吸附量有着影响。
(4) The influence of adsorption properties on industrial waste gas: in addition to the critical diameter of adsorbate molecules, the boiling point, saturation and relative molecular weight of adsorbate also affect the adsorption capacity.
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