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Abstract

A method for recovering hydrogen from a gas stream is presented. This method includes introducing a feed gas stream comprising hydrogen and methane to a first cold box, thereby producing a first hydrogen-enriched stream, and a first methane-enriched stream; then introducing the first hydrogen-enriched stream to a first feed compressor, thereby producing a compressed first hydrogen-enriched stream. The method includes introducing the compressed first hydrogen-enriched stream to a second cold box, thereby producing a second hydrogen-enriched stream, and a second methane-enriched stream; then introducing the second hydrogen-enriched stream to a second feed compressor, thereby producing a compressed second hydrogen-enriched stream. The method includes introducing the compressed second hydrogen-enriched stream to a third cold box, thereby producing a third hydrogen-enriched stream, and a third methane-enriched stream. This method includes introducing the third hydrogen-enriched stream to a third feed compressor, thereby producing a compressed third hydrogen-enriched stream; then introducing the compressed third hydrogen-enriched stream to a PSA, thereby producing a high pressure, high purity hydrogen stream, and a tail gas stream. This method includes introducing a first part of the tail gas stream to a tail gas compressor, and recycling the compressed tail gas back to the feed gas stream; then combining the first methane-enriched stream, the second methane-enriched stream, the third methane-enriched stream, and a second part of the tail gas stream into a fuel stream. And this method includes introducing the fuel stream to a methane compressor.

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First Claim