Patent ID: 9022747
Filing Date: 2015-05-05
Classification: F04B,F04D,Y02B

Abstract:
1. A method of compressing a gas for a gas sequestration process, said method using a compressor train having a plurality of discrete compressor portions and comprising at least an upstream compressor portion, a mid-stream compressor portion and a downstream compressor portion arranged successively in flow series, the method comprising: (i) performing a first compression step by directing a flow of said gas into the upstream compressor portion and driving the upstream compressor portion to compress the gas; (ii) performing a second compression step by directing the compressed flow from the upstream compressor portion into the mid-stream compressor portion and driving the mid-stream compressor portion to further compress the gas; and (iii) performing a third compression step by directing the compressed flow from the mid-stream compressor portion into the downstream compressor portion and driving the downstream compressor portion to further compress the gas, wherein said third compression step is performed selectively in dependence on a flow rate of gas directed into the upstream compressor portion and only when the flow rate of gas directed into the upstream compressor portion is below a predetermined threshold value, and wherein driving each of the discrete compressor portions is performed independently of one another.