Two-stage coal gasification process
This patent describes a non-catalytic two-stage upflow process for gasification of a carbonaceous material. The process comprises the steps of combusting in a fired horizontal slagging reactor a stream comprising an oxygen-containing gas and a first increment of a slurry of particulate carbonaceous material thereby evolving heat and forming a liquid, molten slag and a gaseous products stream and entrained byproduct sticky, molten slag particles; separating the liquid, molten slag; contacting, in an unfired vertical second stage, the gaseous products stream and the entrained byproduct sticky, molten slag particles from the fired horizontal reactor with a second increment of a slurry of particulate carbonaceous material whereby a substantial portion of the heat evolved is recovered by converting the second increment of carbonaceous material and carrier liquid into steam, vapor from the carrier liquid, synthesis gas and char, whereby at least a portion of the entrained byproduct sticky, molten slag particles are cooled below the temperature of adherence to heat transfer surfaces and at least a portion of the entrained, sticky, molten slag particles are absorbed onto the char preventing the fouling of the downstream heat recovery equipment; and recovering another portion of the heat values from the gaseous combustion products in a high temperature heat recovery system.
- Assignee:
- Dow Chemical Co., Midland, MI
- Patent Number(s):
- US 4872886
- Application Number:
- PPN: US 7178035A
- OSTI ID:
- 7271329
- Resource Relation:
- Patent File Date: 5 Apr 1988
- Country of Publication:
- United States
- Language:
- English
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