Oxygen enriched gas supply arrangement for combustion

An oxygen enriched gas supply arrangement for combustion purpose'which is so arranged that, by supplying air to a selective air permeating membrane cell, flow rate and/or oxygen concentration of the oxygen enriched gas passed through the selective gas permeating membrane cell are controlled to predetermined conditions required for the combustion. The arrangement further includes devices for maintaining humidity in the oxygen enriched gas thus obtained at a constant level and for removing pulsation in it, thus being particularly suitable as an air supply source for various combustion equipment and apparatuses.