Method of combusting a sulfur-containing carbonaceous material with ash treatment
AssigneeChang Gung University
InventorsHsiu-Po Kuo, An-Ni Huang
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Abstract
A method of combusting a sulfur-containing carbonaceous material with ash treatment includes: feeding a feed containing the sulfur-containing carbonaceous material and limestone into a furnace; combusting the feed in the furnace so as to generate preliminary fly and bottom ashes; hydrating the preliminary fly and bottom ashes to form a hydrated material; recycling the hydrated materials into the furnace so as to generate secondary fly and bottom ashes; and reacting the secondary fly and bottom ashes with a sulfuric acid solution.
Claims4
A method of combusting a sulfur-containing carbonaceous material with ash treatment, comprising:
- feeding a feed containing the sulfur-containing carbonaceous material and limestone into a furnace;
- combusting the feed in the furnace so as to generate a gaseous product and preliminary fly and bottom ashes;
- hydrating at least a portion of the preliminary fly and bottom ashes to form a hydrated material;
- recycling the hydrated materials into the furnace so as to generate the gaseous product and secondary fly and bottom ashes;
- reacting the secondary fly and bottom ashes with a sulfuric acid solution at a reaction temperature ranging from 50° C. to 80° C. to form a reaction intermediate;
- and
- cooling the reaction intermediate having a pH value ranging from 2.0 to 3.0 to a crystallization temperature ranging from 15° C. to 35° C. for a crystallization reaction to proceed, so as to form a reaction product including gypsum.
Dependencies are inferred from the claim text.