Method for adjusting an oxygen production unit with different set points for each adsorber

A method for adjusting a gas stream separation unit comprising N adsorbers, where N≥2, each following a PSA, VSA or VPSA adsorption cycle, with a time lag of a phase time, said adjustment method comprising the following steps:

• continuously measuring a physical parameter associated with the gas a) stream entering and/or leaving the adsorber;
• for at least one phase of the adsorption cycle, wherein the physical parameter comprises at least one value,
• b) determining at least one characteristic value of the physical parameter measured in step a) or a function of the physical parameter;
• c) comparing this characteristic value with a target value;
• thereby determining a value variation, wherein the target value is a pressure or a pressure difference, and
• d) modifying the flow of the gas stream whereby the characteristic value is equal the target value,
• where steps a) to d) are performed for each adsorber, and
• where at least one adsorber has a unique target value that differs from the target value of the other adsorbers,
• the target value is in the form:
• X+delta Xi, where X is a value common to all the adsorbers and delta Xi is a correction to be made to said common value for the adsorber (i),
• the target values being pressures or pressure differences, and said target values being the desired values at the adsorption cycle completion.