Open AccessEngineering a new material for hot gas cleanup
Author(s) -
T.D. Wheelock,
L. K. Doraiswamy
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/774915
Subject(s) - sorbent , pellets , pelletizing , materials science , calcium looping , inert , porosity , coating , sintering , pellet , lime , inert gas , shell (structure) , chemical engineering , fluidized bed , composite material , particle (ecology) , metallurgy , waste management , chemistry , adsorption , engineering , oceanography , organic chemistry , geology
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