Desulfurization of carbonaceous fuels

Details Desulfurization of carbonaceous fuels Desulfurization of carbonaceous fuels

1993-10-20

1995-10-17

Yildirim, Bekir L.

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

44624, 44625, 208404, 208410, 208411, C10L 912

Patent

active

054586593

ABSTRACT:
First, nitrogen oxides are reduced by firing coal in substoichiometric air conditions in a first stage oxidation unit of a combustor to reduce NO.sub.x from fuel bound nitrogen. Hydrated lime, Ca(OH).sub.2, is introduced into the first stage oxidation unit to produce calcium sulfide. The calcium sulfide becomes tied up in a slag eutectic which is removed prior to entry of the fuel gas to a second stage oxidation unit at the entrance of a furnace where additional preheated air is added to the fuel gas.

REFERENCES:
patent: 4395975 (1983-08-01), Ashworth et al.
patent: 4423702 (1984-01-01), Ashworth et al.
patent: 4624409 (1986-11-01), Takeda et al.
patent: 4801438 (1989-01-01), Najjar et al.

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