Method of operation of process to produce syngas from carbonaceous material
First Claim
1. A process for producing syngas, the process comprising:
- gasifying carbonaceous material to provide a first syngas having a CO to CO2 molar ratio of less than about 0.5 until the first syngas reaches a first target temperature, wherein at least a portion of the first syngas is passed to a syngas cooler at a linear velocity of greater than about 24 meters per second and/or at least a portion of the first syngas is passed to a thermal oxidation unit;
upon reaching the first target temperature, gasifying carbonaceous material to provide a second syngas having a CO to CO2 ratio of greater than the first syngas; and
passing at least a portion of the second syngas to a syngas cooler at a linear velocity of greater than about 24 meters per second.
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Accused Products
Abstract
A process is provided for producing syngas that is effective for use in downstream processes. The process for producing syngas includes operating a gasification apparatus in a start-up mode until the gasification apparatus and equipment downstream of the gasification apparatus are adequately warmed up to a first target temperature. Upon reaching a first target temperature, the process is then operated in a production mode to produce a second syngas with a higher CO/CO2 molar ratio. Operation in a start-up mode until reaching a first target temperature, provides a process that is effective for reducing fouling in downstream equipment and for providing a second syngas can be more effectively cooled and cleaned.
40 Citations
41 Claims
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1. A process for producing syngas, the process comprising:
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gasifying carbonaceous material to provide a first syngas having a CO to CO2 molar ratio of less than about 0.5 until the first syngas reaches a first target temperature, wherein at least a portion of the first syngas is passed to a syngas cooler at a linear velocity of greater than about 24 meters per second and/or at least a portion of the first syngas is passed to a thermal oxidation unit; upon reaching the first target temperature, gasifying carbonaceous material to provide a second syngas having a CO to CO2 ratio of greater than the first syngas; and passing at least a portion of the second syngas to a syngas cooler at a linear velocity of greater than about 24 meters per second. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process to produce syngas, said process comprising:
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(a) adding carbonaceous material and molecular oxygen to a gasification apparatus to produce a first syngas with CO/CO2 molar ratio less than 0.5; (b) passing at least a portion of the first syngas to a syngas cooler and/or passing at least a portion of the first syngas to a thermal oxidation unit; (c) measuring temperature of said first syngas downstream of said gasification apparatus; and (d) upon said temperature of said first syngas prior to entry in said syngas cooler attaining a first target temperature, reducing the addition of molecular oxygen per unit mass of carbonaceous material in said gasification apparatus to produce a second syngas with CO/CO2 molar ratio greater than that of said first syngas, wherein a flow of syngas through the syngas cooler is maintained at a linear velocity of greater than about 24 meters per second. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A process comprising gasifying carbonaceous material in a gasification apparatus to produce a syngas, said method comprising:
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(a) adding carbonaceous material and adding molecular oxygen in said gasification apparatus to produce a first syngas with CO/CO2 molar ratio less than 0.5; (b) passing at least a portion of said first syngas through a syngas cooler at a linear velocity of greater than about 24 meters per second to produce a cooled first syngas; (c) passing at least a portion of said cooled first syngas through a dust collection system to produce a cleaned syngas; (d) measuring a temperature of said cleaned syngas at an exit of the dust collection system; and (e) upon said temperature of cleaned syngas attaining a second target temperature, reducing addition of molecular oxygen per unit mass of carbonaceous material in said gasification apparatus to produce a second syngas with CO/ CO2 molar ratio greater than that of said first syngas. - View Dependent Claims (39, 40, 41)
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Specification