Processes for hydromethanation of a carbonaceous feedstock
First Claim
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1. A process for generating a plurality of gaseous products from a carbonaceous feedstock, and generating a methane product stream, the process comprising the steps of:
- (a) supplying a first particulate carbonaceous feedstock, a first oxygen-rich gas stream and, optionally, an aqueous stream comprising one or both of water and steam, to a syngas generator;
(b) reacting the first particulate carbonaceous feedstock in the presence of oxygen and, optionally, the aqueous stream, in the syngas generator, at a first temperature and a first pressure, to produce a first gas stream comprising hydrogen, carbon monoxide and, optionally, steam;
(c) cooling the first gas stream, optionally with a quench stream comprising one or both of water and steam, to generate a cooled first gas stream comprising hydrogen, carbon monoxide and steam at a second temperature and a second pressure;
(d) introducing a second carbonaceous feedstock, a hydromethanation catalyst, a second oxygen-rich gas stream and the cooled first gas stream to a hydromethanation reactor, the second carbonaceous feedstock comprising a carbon content;
(e) reacting a portion of the carbon content from the second carbonaceous feedstock in the hydromethanation reactor in the presence of oxygen to produce carbon monoxide, hydrogen and heat energy;
(f) reacting the second carbonaceous feedstock in the hydromethanation reactor in the presence of carbon monoxide, hydrogen, steam and hydromethanation catalyst, at a third temperature and a third pressure, to produce a methane-enriched raw product stream comprising methane, carbon monoxide, hydrogen and carbon dioxide;
(g) withdrawing the methane-enriched product stream from the hydromethanation reactor; and
(h) treating the methane-enriched product stream to generate the methane product stream.
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Abstract
The present invention relates to processes for preparing gaseous products, and in particular methane, via the catalytic hydromethanation of a carbonaceous feedstock in the presence of steam, syngas and an oxygen-rich gas stream.
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Citations
21 Claims
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1. A process for generating a plurality of gaseous products from a carbonaceous feedstock, and generating a methane product stream, the process comprising the steps of:
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(a) supplying a first particulate carbonaceous feedstock, a first oxygen-rich gas stream and, optionally, an aqueous stream comprising one or both of water and steam, to a syngas generator; (b) reacting the first particulate carbonaceous feedstock in the presence of oxygen and, optionally, the aqueous stream, in the syngas generator, at a first temperature and a first pressure, to produce a first gas stream comprising hydrogen, carbon monoxide and, optionally, steam; (c) cooling the first gas stream, optionally with a quench stream comprising one or both of water and steam, to generate a cooled first gas stream comprising hydrogen, carbon monoxide and steam at a second temperature and a second pressure; (d) introducing a second carbonaceous feedstock, a hydromethanation catalyst, a second oxygen-rich gas stream and the cooled first gas stream to a hydromethanation reactor, the second carbonaceous feedstock comprising a carbon content; (e) reacting a portion of the carbon content from the second carbonaceous feedstock in the hydromethanation reactor in the presence of oxygen to produce carbon monoxide, hydrogen and heat energy; (f) reacting the second carbonaceous feedstock in the hydromethanation reactor in the presence of carbon monoxide, hydrogen, steam and hydromethanation catalyst, at a third temperature and a third pressure, to produce a methane-enriched raw product stream comprising methane, carbon monoxide, hydrogen and carbon dioxide; (g) withdrawing the methane-enriched product stream from the hydromethanation reactor; and (h) treating the methane-enriched product stream to generate the methane product stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification