Two stage combustion

Patent · Tue Aug 08 04:00:00 EDT 1989

OSTI ID:5344581

Khinis, M J; Patel, J G; Sandstrom, W A

This patent describes a process for combusting sulfur and nitrogen containing carbonaceous materials in a two stage combustion process. It includes: introducing sulfur and nitrogen containing carbonaceous materials and sulfur fixation agent particulates into a first combustion stage single fluidized bed with upflowing withdrawal gas; combusting the carbonaceous materials in the fluidized bed under substoichiometric oxygen conditions; reacting the gaseous sulfur compounds with oxides; converting the nitrogen into molecular nitrogen; reacting the intermediate solid metallic sulfur compound in an oxidizing region to form a stable, solid, environmentally acceptable sulfur-containing compound; agglomerating the ash in the oxidizing region to form easy transportable, non-leachable, environmentally acceptable ash; burning the reducing gases and the uncombusted carbonaceous materials; separating solid lines in the second combustion stage cyclonic combustor and recycling the fines to the first combustion stage fluidized bed; and removing from the second stage combustor flue gases comprising environmentally acceptable amount of CO, NO/sub chi/, SO/sub chi/, and THC content.

• Assignee: Institute of Gas Technology, Chicago, IL
• Patent Number(s): US 4854249
• Application Number: PPN: US 7196363A
• OSTI ID: 5344581
• Country of Publication: United States
• Language: English

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