Hydrogen Recovery From A Mixture Of Hydrogen and Hydrocarbons At Low Pressure And Of Low Hydrogen Content
First Claim
1. A method for recovering hydrogen from a gas stream comprising:
- a. 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;
b. introducing said first hydrogen enriched stream to a first feed compressor, thereby producing a compressed first hydrogen enriched stream;
c. introducing a said compressed first hydrogen enriched stream to a second cold box, thereby producing a second hydrogen enriched stream, and a second methane enriched stream;
d. introducing said second hydrogen enriched stream to a second feed compressor, thereby producing a compressed second hydrogen enriched stream;
e. introducing a said compressed second hydrogen enriched stream to a third cold box, thereby producing a third hydrogen enriched stream, and a third methane enriched stream;
f. introducing said third hydrogen enriched stream to a third feed compressor, thereby producing a compressed third hydrogen enriched stream;
g. introducing said compressed third hydrogen enriched stream to a PSA, thereby producing a high pressure, high purity hydrogen stream, and a tail gas stream;
h. introducing a first part of said tail gas stream to a tail gas compressor, and recycling said compressed tail gas back to said feed gas stream;
i. combining said first methane enriched stream, said second methane enriched stream, said third methane enriched stream, and a second part of said tail gas stream into a fuel stream; and
j. introducing said fuel stream to a methane compressor.
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Accused Products
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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Citations
24 Claims
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1. A method for recovering hydrogen from a gas stream comprising:
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a. 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; b. introducing said first hydrogen enriched stream to a first feed compressor, thereby producing a compressed first hydrogen enriched stream; c. introducing a said compressed first hydrogen enriched stream to a second cold box, thereby producing a second hydrogen enriched stream, and a second methane enriched stream; d. introducing said second hydrogen enriched stream to a second feed compressor, thereby producing a compressed second hydrogen enriched stream; e. introducing a said compressed second hydrogen enriched stream to a third cold box, thereby producing a third hydrogen enriched stream, and a third methane enriched stream; f. introducing said third hydrogen enriched stream to a third feed compressor, thereby producing a compressed third hydrogen enriched stream; g. introducing said compressed third hydrogen enriched stream to a PSA, thereby producing a high pressure, high purity hydrogen stream, and a tail gas stream; h. introducing a first part of said tail gas stream to a tail gas compressor, and recycling said compressed tail gas back to said feed gas stream; i. combining said first methane enriched stream, said second methane enriched stream, said third methane enriched stream, and a second part of said tail gas stream into a fuel stream; and j. introducing said fuel stream to a methane compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification