Method to control syngas composition from an engine-based syngas generator
AssigneeResearch Triangle Institute
InventorsSameer Paravathikar, John R. Carpenter
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Abstract
The present disclosure provides a process for controlling syngas composition from an internal combustion engine-based syngas generator. While air is typically used as an oxidant, with nitrogen (N2) as a diluent, this results in expensive downstream compression, and low feedstock conversion efficiencies. This disclosure provides CO2 as a diluent to reduce N2 concentration in the syngas. In some embodiments, the CO2 diluent may be from either a biogas processing coupled with methanol, DME, and/or hydrocarbon production; or natural gas processing coupled with Fischer-Tropsch (FT) synthesis and/or other hydrocarbon synthesis.
Claims30
A method for producing syngas which comprises reacting a hydrocarbon fuel and enriched-oxygen containing feed gas in internal combustion engine reactor wherein the feed gas comprises a carbon dioxide diluent present at about 5 to about 50 mol. % and the enriched-oxygen is present about 25 to 95% mol. % so as to produce the syngas.
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A system for the conversion of biogas to methanol, DME and/or hydrocarbons which comprises
- (a) a biogas processing unit removing a substantial portion of sulfur compounds from the biogas and, optionally removing at least a portion of carbon dioxide from the biogas, to generate a clean biogas stream with about 1 to about 35 mol. % carbon dioxide content;
- (b) an air separation unit to generate an oxygen-rich gas stream with about 25 to about 95 mol. % oxygen;
- (c) an internal combustion engine reactor fluidly connected to the biogas processing unit and the air separation unit so as to react the clean biogas stream with the oxygen enriched stream so as to produce a syngas stream;
- (d) a gas separation unit and a syngas compression unit fluidly connected to the syngas stream from the internal combustion engine reactor so as to generate a processed syngas stream;
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- (e) a methanol, a DME, and/or a hydrocarbon synthesis unit fluidly connected to the processed syngas stream.
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A system for the conversion of natural gas to synthetic crude oil which comprises
- (a) a natural gas fluid stream;
- (b) an air separation unit to generate an oxygen-rich gas stream with about 25 to about 95 mol. % oxygen;
- (c) an internal combustion engine reactor fluidly connected to the natural gas source and the air separation unit so as to react the clean biogas stream with the oxygen enriched stream so as to produce a syngas stream;
- (d) a water gas shift/gas separation unit and a syngas compression unit fluidly connected to the syngas stream from the internal combustion engine reactor so as to generate a processed syngas stream and a carbon dioxide rich stream;
- (e) wherein the carbon dioxide rich stream is fluidly connected to the internal combustion engine reactor to provide a carbon dioxide containing diluent stream;
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- (f) a Fischer Tropsch (FT) reactor fluidly connected to the processed syngas stream.
Dependencies are inferred from the claim text.