| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of an air separator capable of performing the operation with large and frequent increase and decrease amount without using additional equipment such as a gas holder and a back-up device. SOLUTION: This control method of the air separator performs the operation of the air separator on the basis of basic control loop such as the control of flow rates of a raw material air AIR, a crude argon gas RAr, a product oxygen gas GO2, a low-pressure product nitrogen gas GN2, an medium-pressure product nitrogen gas MGN2, a circulated liquid nitrogen RLN2 to an upper tower 9, the liquid air LAIR1, the liquid air LAIR2 for argon condenser and the liquid oxygen LO2, the control of pressures of the lower tower 4 and an upper tower 9, and the control of a liquid level of the lower tower 4 and that of the upper tower 9, and further controls the model prediction control type product concentration. In particular, the concentration of argon in field argon FAr, the concentration of oxygen in crude argon RAr and the concentration in product oxygen, are directly fed back, and the operation is performed under the optimum control on the basis of the predicted values to quickly follow the variation of load and to control the product concentration within an allowable range. COPYRIGHT: (C)2004,JPO
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