| 摘要 |
<p>PROBLEM TO BE SOLVED: To stabilize the purity of a product gas in stepless control or stepwise control by keeping the pressure after pressure equalization and pressure elevation constant. SOLUTION: In the method for stepless or stepwise operation control of pressure-swing adsorption equipment, the pressure in at least one adsorption column among plural adsorption columns 1A to 1C is detected by a pressure detector 31, the pressure when a pressure equalization process is finished is sampled, the average value of the pressures obtained by sampling plural numbers of times when the pressure equalization is finished is compared with a set pressure, the opening degree of a pressure equalization flow rate control valve 24 is added by a set amt. when the average value is high and the opening degree of the control valve 24 is subtracted by a set amt. when the average value is low. Moreover, the pressure when a pressure elevation process is finished is sampled, the average value of the pressures obtained by sampling plural numbers of times when the pressure elevation is finished is compared with a set value, the set value of the pressure elevation flow rate and/or the opening degree of a pressure elevation bypass valve 23 are subtracted by the set amt. when the average value is high and the set value of the pressure elevation flow rate and/or the opening degree of the pressure elevation bypass valve 23 are added by the set amt. when the average value is low.</p> |
