| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high adsorptive function of an adsorbent even immediately after consumed and prevent overheating of the adsorbent in an adsorption tower at the time of stoppage of the adsorption tower by installing a circulation route to transport an adsorbent which is reproduced by desorption again to an upper part of the adsorption tower. SOLUTION: In the case supply of a raw gas is stopped and the operation of an adsorption tower 1 is stopped, at first, a blower 3 in a purified gas discharging path 6 of the adsorption tower 1 is stopped to stop the suction from a raw gas introducing path 5. Then, a closing valve 18 is closed and, at the same time, a closing valve 15 installed in a circulation path 9 is opened. Consequently, the transportation of an adsorbent 12 to a desorption tower from the adsorption tower 1 is stopped since the closing valve 18 in a transportation path 7 is closed and, on the other hand, due to the opening of the circulation path 9, operation of the desorption tower 2 is continued and all of the adsorbent 12 in the desorption tower 2 is reproduced by desorption. That is, an adsorbent 12 stored in an adsorbent storing part 12 is transported again to the upper part of the adsorption tower 2 and circulated and the adsorbent 12 which is not reproduced is completely reproduced by desorption.</p> |
