Open AccessDevelopment of a use for Illinois coal concentrates for slurry fed gasifiers; Technical report, September 1--November 30, 1993
Author(s) -
L. Khan,
J.M. Lytle,
S. Khan,
M. At-Taras,
H.P. Ehrlinger
Publication year - 1993
Language(s) - English
Resource type - Reports
DOI - 10.2172/140980
Subject(s) - slurry , waste management , wood gas generator , coal slurry , coal , heat of combustion , environmental science , engineering , combustion , environmental engineering , chemistry , organic chemistry
The primary purpose of this project is to identify and test concentrates made from preparation plant fines as to their amenability as fee for slurry-fed, slagging, entrained-flow gasifiers. The high sulfur content and high BTU value of Illinois coals are particularly advantageous in such a gasifier. Elemental sulfur is recovered as a revenue-producing product in gasifier technologies, and the higher BTU Illinois coal concentrate requires less water to produce a pumpable slurry than western coal (30--35% vs 45%) thereby reducing the amount of heat lost in vaporization of entrained water. This means that 66 tons of Illinois coal concentrate, containing 13,000 BTU per pound, at 70% solids would provide as much net heat as 100 tons of 9500 BTU coal pumped at 54% solids. During the current reporting period twelve 55-gallon drums of preparation plant fines were obtained from a mine in Illinois. Part of the slurry was screened on 60 mesh to remove coarse material (about 9.57%) and the fines were used for preliminary flotation tests in a subaeration cell. Fifteen batch tests were conducted to establish flotation conditions for operation of the continuous flow column flotation unit. Varying the type and quantities of reagents, grades were recorded over 12,000 BTU and the recovery of combustible matter or BTU varied from 41.6% to 88.2%