| 摘要 |
<p>PURPOSE:To conserve washing gas, by comparing the concn. of the specific component in washing gas introduced into a tower with that of the specific component in the washing waste gas passed through the tower and stopping washing when the ratio of both of them or the difference therebetween reached a tolerance value. CONSTITUTION:Stock gas is made to flow to adsorbing towers 3a, 3b to adsorb CO. Product CO-gas is introduced into the adsorbing towers 3a, 3b to perform the washing of both towers but, at this time, the concn. of CO in washing gas before introduced into the adsorbing towers is measured by an analyser 10a an the concn. of CO in washing waster gas passed through the adsorbing towers is measured by the analyser 21 provided between adsorbing tower connection pipes 8a, 8b. At the point of time when the concn. of CO obtained by the analysers 21, 10a became equal, a valve 11 or a valve 12 is closed through a control apparatus 31 to stop the supply of the washing gas. By this method, the washing gas is conserved and the recovery ratio of the product gas is en hanced.</p> |
