GAS COMPRESSION DEVICE AND METHOD OF CONTROLLING GAS COMPRESSION DEVICE

摘要

A gas compression device for compressing gas by multiple compression means arranged in series relative to the direction of flow of the gas. The flow rate of the gas sucked into a gas compression section is controlled according to the amount of demand of the gas from a user. When the flow rate of each compression means is less than a set value set based on a surge limit, at least a part of gas discharged from the gas compression section is circulated and supplied to a diffuser of the compression means. In the construction above, a load on drive means is sufficiently reduced while occurrence of surge in the compression means is suppressed and, as a result, the amount of energy consumption is reduced.