Process for gasification and production of by-product superheated steam
Coal or other high ash containing carbonaceous solid fuel is reacted with a free-oxygen containing gas, with or without a temperature moderator, in a down-flow partial oxidation gas generator to produce a stream of raw synthesis gas, fuel gas, or reducing gas. A large portion of the combustion residue, I.E. Molten slag and/or particulate solids that is entrained in the down-flowing generated gas stream is removed by gravity when the gas stream is passed through a diversion chamber. The main gas stream leaving the diversion chamber through the side outlet passes upward through a solids separation zone, optionally including gas-gas quench cooling, cyclones, filters, impingement separators, or combinations thereof. Next, most of the sensible heat in the gas stream is recovered by indirect heat exchange with boiler feed water and steam. Saturated and superheated steam are produced. In the main gas cooling zone, the hot gas stream with a substantially reduced solids content is passed serially through the tubes of two or more communicating shell-and-straight fire tube gas coolers. Saturated steam, which is produced in one, or more of said gas coolers, is superheated in another of said gas coolers.
- Assignee:
- Texaco Inc
- Patent Number(s):
- US 4247302
- OSTI ID:
- 6327908
- Resource Relation:
- Patent File Date: Filed date 13 Jul 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COAL GASIFICATION
WASTE HEAT UTILIZATION
HEAT RECOVERY
STEAM GENERATION
SUPERHEATING
ENERGY RECOVERY
GASIFICATION
HEATING
RECOVERY
THERMOCHEMICAL PROCESSES
WASTE PRODUCT UTILIZATION
010404* - Coal
Lignite
& Peat- Gasification
320304 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization