Partial combustion process for coal

Details Partial combustion process for coal Partial combustion process for coal

1982-05-10

1983-10-04

Favors, Edward G.

Furnaces

Process

Burning pulverized fuel

48210, 110229, 110230, 431 10, F23D 100

Patent

active

044072066

ABSTRACT:
Disclosed is a process for combusting coal containing more than 1 wt. % sulfur which process comprises (a) providing a coal containing more than 1 wt. % sulfur and containing an organically bound calcium to sulfur ratio of at least about 0.8 to 1, (b) burning the coal to about 80% to 95% carbon conversion at temperatures greater than about 1,100.degree. C. in a first combustion zone in the presence of an oxidizing agent but under reducing conditions such that the equivalence ratio of coal to oxidizing agent is less than 1.5 but greater than or equal to 1.0, (c) separating the resulting solid effluent from the gaseous effluent from the first combustion zone, and (d) burning the gaseous effluent at a temperature from about 1,000.degree. C. to about 1,500.degree. C. in a second combustion zone under oxidizing conditions. A substantial amount of the sulfur of the coal is captured in the resulting solid effluent.

REFERENCES:
patent: 855548 (1977-11-01), Blair
patent: 2830883 (1958-04-01), Eastman
patent: 3969089 (1976-07-01), Moss
patent: 4021186 (1977-05-01), Tenner
patent: 4026679 (1977-05-01), Collin
patent: 4060397 (1977-11-01), Buiter
patent: 4226601 (1980-10-01), Smith
patent: 4246853 (1981-01-01), Mehta
patent: 4285283 (1981-08-01), Lyon
EPA-600/7-78-153b published 11/78, "Sulfur Retention in Coal Ash".
Reprint from AlChe Symposium Series vol. 67, No. 116, 1971, "The Scale-Up of a Fluidized Bed Combustion System to Utility Boilers".
Battelle Energy Program Report dated 12/15/75, "Experimental Studies on the Feasibility of In-Furnace Control of SO.sub.2 and NO.sub.2 Emissions from Industrial Stokers".
Battelle Energy Program Report dated 11/15/75 "The Super-Slagging Gasifier-Demonstration of Desulfurizing Principle".
Paper by Energy and Environmental Research Corporation, "The Generalization of Low Emission Coal Burner Technology".

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