Engineering a new material for hot gas cleanup

Wheelock, T.D. ; Doraiswamy, L.K. ; Constant, K.

Federal Energy Technology Center (U.S.)

关键词: Limestone;    Heating;    Sintering;    01 Coal, Lignite, And Peat;    Pelletizing;   

DOI  :  10.2172/774915
RP-ID  :  DE--FG26-99FT40587-01
RP-ID  :  FG26-99FT40587
RP-ID  :  774915

美国|英语

来源: UNT Digital Library

【 摘 要 】

The engineering development of a promising sorbent for desulfurizing hot coal gas was initiated and preliminary results are presented. The sorbent is calcium-based and is designed to be regenerated and reused repeatedly. It is prepared by pelletizing powdered limestone in a rotating drum pelletizer followed by the application of a coating which becomes a strong, porous shell upon further treatment. The resulting spherical pellets combine the high reactivity of lime with the strength of an inert protective shell. Preliminary work indicates that a satisfactory shell material is comprised of a mixture of ultrafine alumina powder, somewhat coarser alumina particles, and pulverized limestone which upon heating to 1,373 K (1,100 C) becomes a coherent solid through the mechanism of particle sintering. Several batches of core-in-shell pellets were prepared and tested with encouraging results.