METHOD OF STRIPPED GAS COMPRESSION Russian patent published in 2017 - IPC F25J3/00 

FIELD: oil and gas industry.

SUBSTANCE: stripped gas compression method involves heating the stripped gas obtained by separating hydrocarbons C_2+above from the dried gas with its low-temperature condensation and rectification, compression of the stripped gas in the compressor part of the turbo expander and cooling of the stripped gas. At the same time, prior to the stripped gas compression in the compressor part of the turbo expander, a portion of the heated stripped gas flow is taken and its parallel compression is performed in the compressor. The amount of the taken portion of the flow is determined by calculation, depending on the power of the turbo expander, which is determined by the required degree of recovery of hydrocarbons C_2+above, and the compression ratio of the compressor, determined by the required pressure of the commercial stripped gas. In addition, after parallel compression in the compressor, the flow of the stripped gas is combined with the flow of the stripped gas, exiting the compressor part of the turbo expander, ensuring that the pressure of the combined flows is equal, and then directed to cooling.

EFFECT: reduction of operating and capital costs.

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