Method of operating a coal gasifier

Details Method of operating a coal gasifier Method of operating a coal gasifier

1977-08-18

1979-09-25

Bashore, S. Leon

Gas: heating and illuminating

Processes

Coal

48197R, 48203, 48DIG2, C10J 346

Patent

active

041689569

ABSTRACT:
A method of operating an entrained flow coal gasifier which comprises the steps of firing coal at two levels in a combustion zone with near stoichiometric air, removing molten ash from the combustion zone, conveying combustion products upwardly from the combustion zone through a reduction zone, injecting additional coal into the combustion products in the reduction zone and gasifying at least a portion of the coal to form low BTU gas, conveying the gas to a point of use, including also reducing gasifier output by modifying the ratio of air to coal supplied to the upper level of the combustion zone so that the ratio becomes increasingly substoichiometric thereby extending the gasification of coal from the reduction zone into the upper level of the combustion zone, and maintaining the lower level of coal in the combustion zone at near stoichiometric conditions so as to provide sufficient heat to maintain effective slagging conditions.

REFERENCES:
patent: 901232 (1908-10-01), Eldred
patent: 1039398 (1912-09-01), Hirt
patent: 3782913 (1974-01-01), Donath
patent: 3840353 (1974-10-01), Squires
patent: 3981690 (1976-09-01), Chen et al.
Patterson, "The Combustion Engineering Coal Gasification Program," pp. 28-34 of Combustion Magazine, May/1976.

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