Open AccessDEVELOPMENT OF A CALCIUM-BASED SORBENT FOR HOT GAS CLEANUP
Author(s) -
T.D. Wheelock,
L. K. Doraiswamy
Publication year - 1999
Language(s) - English
Resource type - Reports
DOI - 10.2172/780844
Subject(s) - pellets , calcination , calcium looping , pelletizing , sorbent , materials science , cement , calcium carbonate , calcium oxide , aluminate , mixing (physics) , chemical engineering , adsorption , curing (chemistry) , pellet , composite material , mineralogy , metallurgy , chemistry , catalysis , biochemistry , physics , organic chemistry , quantum mechanics , engineering
The development and testing of potential calcium-based sorbents for hot gas cleanup continued. One of the most promising materials combines powdered limestone and a calcium aluminate cement by two step pelletization followed by steam curing. Reasonably strong pellets are produced with good adsorption characteristics by incorporating 20 wt.% cement in the core and 40 wt.% cement in the shell. The resulting 4.76 mm diameter pellets are capable of withstanding a crushing force approaching 11.5 N/mm before breaking and are also capable of removing H{sub 2}S from dilute, hot gas streams. The pellets are also regenerable and reusable. Another promising material combines calcium carbonate powder and finely ground calcined alumina in tablet form. The small tablets are prepared by mixing the materials with water to form a thick paste which is then molded and dried. The tablets are hardened by calcining at either 1000 to 1100 C. The resulting tablets are strong and capable of removing H{sub 2}S from a dilute, hot gas stream