High-purity oxygen rectification control method and device

The invention relates to the technical field of air separation, in particular to a high-purity oxygen rectification control method and a device thereof, and the method comprises the following steps: setting a high-purity oxygen output demand FPO, collecting oxygen content data in feed and pressure data of the top of a rectification tower, automatically calculating flow control function set points at different positions by a logic controller FUN01, and calculating the flow control function set points according to the flow control function set points. And the logic controller FUN01 is used for controlling the opening degrees of the rectifying tower feeding control valve V01, the rectifying tower top feeding control valve V02 and the rectifying tower top discharging control valve V05, so that the operation pressure and temperature distribution of the rectifying tower and the impurity content of the rectifying tower top are within the control range, and finally, qualified high-purity oxygen products are stably ou