FIELD: chemistry.
SUBSTANCE: provided is an adsorption column packed with adsorbent, a supply/release means which supplies source gas containing combustible gas and air is provided, a collection means which desorbs and collects the combustible gas adsorbed by the adsorbent is provided, a control means which sequentially executes a combustible gas adsorption step and a combustible gas desorption step is provided, a detection means which detects the combustible gas concentration in the source gas is provided, and an operation condition setting unit which changes the adsorption completion time point at which the adsorption step is completed on the basis of the combustible gas concentration detected by the detection means.
EFFECT: possible to enrich combustible gas to higher concentrations and to minimize material losses in an efficient manner.
5 cl, 7 dwg, 2 tbl
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