Title: Method for removal of sulfur from coal in stoker furnaces

Abstract: A low-cost method of taking sulfur out of coal in stoker furnaces comprising mixing the coal with natural-occurring flue dust from steel-making, pulverized red mud from aluminum-making, of pulverized retort residues from zinc-making, or a pulverized prepared material comprising principally the ferrites and oxides of certain minerals and at least a trace of ferric oxide as a catalyst for accelerating the conversion of sulfur dioxide to sulfur trioxide and heating the mixture in the combustion zone of the furnace in the presence of water vapor from the fuel to form sulfuric acid for oxidizing said natural-occurring or prepared sulfur dioxide absorbent materials into sulfates and precipitating the same along with ash in the fuel to the bottom of the furnace.

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Inventors: Heins, Sidney M. (Chicago, IL, US)

Application Number: 964619
Filing Date: 1978-11-29
Publication_date: 1979-11-06
Assignee:
Primary Class(es): 44/622 44/500, 44/591, 44/604, 44/623, 44/905, 110/342, 110/345
Other Classes:
US Patent Ref:

2473987	Jun, 1949	Brandon	75/42.
2800172	Jul, 1957	Romer et al.	75/42.
2956868	Oct, 1960	Burgess	44/26.
3823676	Jul, 1974	Cook et al.	110/342.
3949684	Apr, 1976	Copeland	110/345.
3983218	Sep, 1976	Heins	423/244.

Other Refs:
Primary Examiner: Dees, Carl F.
Assistant Examiner:
Attorney: Diver; John R.