초록 ▼

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 pow

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.

대표청구항 ▼

In a process for fluidized bed combustion of sulfur containing fuel such as coal or heavy oil, wherein said fuel generates sulfur oxides in the flue gas stream upon combustion, and limestone is added to said bed to react with said sulfur oxides to remove them from the flue gas stream, the improvemen

In a process for fluidized bed combustion of sulfur containing fuel such as coal or heavy oil, wherein said fuel generates sulfur oxides in the flue gas stream upon combustion, and limestone is added to said bed to react with said sulfur oxides to remove them from the flue gas stream, the improvement which comprises enhancing the removal of sulfur oxides by utilizing said limestone in the form of agglomerates comprising fine grains of naturally occurring, uncalcined limestone and a cementitious clay selected from the group consisting of attapulgite, sepiolite, smectite and mixtures thereof in binder-effective amount.