| 摘要 |
<p>PURPOSE:To enhance the recovery ratio of product gas, in a pressure swing adsorbing process, by returning a part of the exhaust gas of an adsorbing tower in a regeneration process to the supply line for gas to be purified in an adsorbing tower in a purifying process. CONSTITUTION:Stock gas is compressed by a compressor 21 to be introduced into an adsorbing tower A and N2 is removed by adsorption while product H2 is taken out. An adsorbing tower B is reduced in pressure to atmospheric pressure from an exhaust valve 3b and N2 desorbed along with residual H2 is returned to a stock gas line 11 through a pressure reducing valve 9 and a valve 14. Subsequently, a part of product H2 is introduced into the adsorbing tower B through a pressure reducing valve 6 and a valve 4b to wash an adsorbent and exhaust gas is returned to the stock gas line 11 through the pipe 14 and, subsequently, the adsorbing tower B is again pressurized by product H2-gas to prepare the next adsorbing process. Because the concns. of N2 in exhaust gases at the time of evacuation and washing rise by repeating the processes, a part of the exhaust gas is purged from a valve 10 to lower the concns. of N2 to a set level or less.</p> |
