Production of sulphur emissions by coagglomerating coal with limestone

A novel technique is described whereby sulphur dioxide adsorbents can be incorporated directly into coal or coke agglomerates during liquid phase agglomeration using biutmen or heavy oil as the binder. This technique allows the advantageous use of very small and more active sulphur adsorbent particles in fluid bed combustion by binding them tightly within larger coal agglomerates, thereby reducing the possibility of their elutriattion from the bed. As a result, higher adsorbent utilization efficiencies can be obtained for the coagglomerated fuel, compared to those systems in which a coarser adsorbent is added separately to the fluid bed. In this investigation we have attempted the coagglomeration of a Nova Scotia coal with limestone to reduce sulphur emissions during combustion. Static combustion tests at 850 degrees Celsius were carreid out in a muffle furnace and compared to results found for a bench scale fluidized bed unit at the same temperature. In both cases sulphur capture of over 60 percent was obtained at a calcium to sulphur molar ration of 1:1.[Peer reviewed: YesNRC publication: Ye