Importance

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Abstract

A method and apparatus for implementing a thermodynamic cycle, which includes the use of a composite stream, having a higher content of a high-boiling component than a working stream, to provide heat needed to evaporate the working stream. After being superheated, the working stream is expanded in a turbine. Thereafter, the expanded stream is separated into a spent stream and a withdrawal stream. The withdrawal stream is combined with a lean stream to produce a composite stream. The composite stream evaporates the working stream and preheats the working stream and the lean stream. The composite stream is then expanded to a reduced pressure. A first portion of this composite stream is fed into a gravity separator. The liquid stream flowing from the gravity separator forms a portion of the lean stream that is combined with the withdrawal stream. The vapor stream flowing from the separator combines with a second portion of the composite stream in a scrubber. The vapor stream from the scrubber combines with a third portion of the expanded composite stream to produce a pre-condensed working stream that is condensed forming a liquid working stream. The liquid streams from the scrubber and gravity separator combine to form the lean stream. The liquid working stream is preheated and evaporated transforming it into the gaseous working stream. The cycle is complete when the gaseous working stream is again superheated.

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First Claim