Method of producing methanol synthesis gas
AssigneeKrupp-Koppers GmbH
InventorsRolf Wetzel, Bernhard Firnhaber
Life of this patent
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Abstract
In accordance with a method of producing of methanol synthesis gas from a partial oxidation crude gas, the gas is cooled after a waste heat boiler of a gasifier by adding a converted circulating gas in a quenching zone. The resulting gas mixture is dedusted and then separated into a product gas partial stream and a circulating gas partial stream. The product gas partial stream is supplied after corresponding gas treatment to the synthesis reactor while the circulating gas partial stream is subjected to a CO-conversion and supplied back to the quenching zone.
Claims11
A method of producing a methanol synthesis gas with a ratio of carbon monoxide to hydrogen defined for a desired synthesis reaction, by gasifying of fine-grained to dust-like fuels at temperatures above a slag melting point, comprising the steps of producing a partial oxidation crude gas in a gasifier;
- indirectly cooling the produced partial oxidation crude gas in a waste heat boiler after the gasifier with steam generation;
- further cooling the partial oxidation gas after the waste boiler by adding a converted circulating gas;
- subjecting the thusly produced gas mixture of the partial oxidation gas with the converted circulating gas to a dry dedusting;
- separating the dedusted gas mixture into a product gas partial stream and a circulating gas partial stream;
- subjecting the product gas partial stream to a further cooling, a subsequent gas washing for removing residual dust and impurities, a final cooling for water condensation, and a desulfurization and CO.sub.2 removal, and then recovering the desulfurized product methanol synthesis gas;
- saturating the circulating gas partial stream with use of a condensate from the final cooling of the product gas partial stream and washing at a dew point of the gas;
- subjecting the thusly purified circulating gas partial stream, for adjusting a molar ratio of carbon monoxide to hydrogen to a CO-conversion in the presence of a sulfur resistant catalyst;
- and cooling the converted circulating gas close to its water steam dew point for further cooling of the partial oxidation crude gas after the waste heat boiler by recycling the converted circulation gas for adding to the partial oxidation crude gas.
A method of producing a synthesis gas with a ratio of carbon monoxide to hydrogen defined for a desired synthesis reaction, by gasifying of fine-grained to dust-like fuels at temperatures above a slag melting point, comprising the steps of producing a partial oxidation crude gas in a gasifier;
- indirectly cooling the produced partial oxidation crude gas in a waste heat boiler after the gasifier with steam generation;
- further cooling the partial oxidation gas after the waste boiler by adding a converted circulating gas;
- subjecting the thusly produced gas mixture of the partial oxidation gas with the converted circulating gas to a dry dedusting;
- separating the dedusted gas mixture into a product gas partial stream and a circulating gas partial stream;
- subjecting the product gas partial stream to a further cooling, a subsequent gas washing for removing residual dust and impurities, a final cooling for water condensation, and a desulfurization and CO.sub.2 removal, and then recovering the desulfurized product gas, saturating the circulating gas partial stream with use of a condensate from the final cooling of the product gas partial stream and washing at a dew point of the gas;
- subjecting the thusly purified circulating gas partial stream, for adjusting a molar ratio of carbon monoxide to hydrogen to a CO-conversion in the presence of a sulfur resistant catalyst;
- and cooling the converted circulating gas close to its water steam dew point for further cooling of the partial oxidation crude gas after the waste heat boiler by recycling the converted circulation gas for adding to the partial oxidation crude gas.
Dependencies are inferred from the claim text.