| 摘要 |
<p>In a method for removing solvent vapours from air, by activated carbon adsorption and regeneration of the carbon by steam desorption, >=2 activated carbon chambers are used, the sequence of adsorption and regeneration being automatically regulated as a function of the concn. of solvent vapours, pref. by switching from adsorption to regeneration when the concn. of the vapours in the air on the discharge side of the adsorber exceeds a predetermined value. Pref., regeneration is commenced with a very high steam flow, using superheated steam, followed by more moderate flow, then drying. The redn. from high to moderate flow can be continuous or by steps, as the solvent concn. decreases. The number of activated carbon chambers in operation is given by n = (tA - tR)/tA (where tA is adsorption period; tR is regeneration period; and n is > rounded off to the next highest whole number).</p> |
