Furnaces – Process – Burning pulverized fuel
Patent
1983-05-17
1985-10-01
Favors, Edward G.
Furnaces
Process
Burning pulverized fuel
110215, 110245, 110263, 110345, 122 4D, 201 31, 208 8R, 208 11R, 208127, F23D 100
Patent
active
045438943
ABSTRACT:
A two-stage process for staged combustion of crushed retorted particles, especially sulfur and nitrogen-bearing shale, provides maximum heat from combustible materials in shale while emissions of carbon monoxide and oxides of sulfur and nitrogen are minimized. In the first stage, combustion is maintained under fluidizing conditions with a substoichiometric amount of oxygen. Off-gases from the first stage are burned in a second-stage combustion zone utilizing an oxygen-containing gas stream controlled to limit emission of carbon monoxide in the flue gas. To minimize production of sulfur oxides, combustion temperature is concurrently maintained below a peak value of 1700.degree. F. by introducing inert gas or recycled decarbonized fines to the first-stage combustion zone to reduce temperature therein.
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"Calcined Lime and in Situ Formed Char as Catalysts for `NO` Reducing Gases," by Takehiko Furusawa, et al., Proceedings of the International Conference on Fluid Bed Combustion, 7th, vol. 1, 1982, pp. 525-533.
Christolini, Jr. Ben A.
Griswold Charles F.
Bostich June M.
Favors Edward G.
Sandford Dean
Union Oil Company of California
Warner Steven E.
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