Limestone-based sorbent agglomerates for removal of sulfur compo

Details Limestone-based sorbent agglomerates for removal of sulfur compo Limestone-based sorbent agglomerates for removal of sulfur compo

1980-08-04

1982-02-23

Padgett, Benjamin R.

Compositions

Co, s, negative element, or acid, bindant containing

252443, 55 73, 423220, 423242, 423244, B01D 5312, B01J 824

Patent

active

043168132

ABSTRACT:
Sulfur-containing compounds such as hydrogen sulfide and sulfur oxides arising from gasification or combustion of organic fuels such as coal may be removed from the hot gases by attrition resistant, highly reactive limestone-based sorbent agglomerates. The agglomerates are formed by crushing and powdering naturally occurring limestone into grains of fine particle size and binding the powdered limestone grains with a binder that is stable at high temperature, for example a colloidal grade of attapulgite clay. Volatile liquid is added to the mix of binder and powdered limestone to form a paste-like mixture, which is then agglomerated in compression-type agglomerating equipment to form spheroidal agglomerates having good green strength. In fluidized bed combustion applications, these agglomerates have attrition resistance equivalent to conventional natural limestone granules and are far more reactive in terms of sulfur pickup.

REFERENCES:
patent: 3976747 (1976-08-01), Shale et al.
patent: 4108969 (1978-08-01), Merkl
patent: 4115518 (1978-09-01), Delmon
patent: 4177158 (1979-04-01), Blue
Gasner et al., "Limestone Utilization Optimization in Fluidized Bed Boilers", Pro. of the Fifth Int. Conf., vol. II, Mitre Corp., 1978, (pp. 762-772).

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