Flammable gas concentration device and flammable gas concentration method

摘要

A flammable gas concentration device comprises an adsorption tower filled by an adsorbent for adsorbing a flammable gas. Raw gas containing air and a flammable gas is fed to the adsorption tower via a feeding path and an exhaust gas in the raw gas which has not been adsorbed to the adsorbent is discharged to an outside of the adsorption tower via a discharge path. Pressure in the adsorption tower is reduced lower than an atmospheric pressure, and the flammable gas adsorbed by the adsorbent is desorbed and collected through a collection path. A flammable gas adsorption step of feeding the raw gas to the adsorption tower and discharging the exhaust gas from the adsorption tower, and a flammable gas desorption step of collecting the desorbed flammable gas are sequentially executed.