Sulfur species formation in a high-pressure entrained-coal gasifier

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5216116

Nichols, K M; Hedman, P O; Smoot, L D; Blackham, A U

This work summarizes several observations concerning the effects of pressure and oxygen-to-coal mass ratio on the fate of coal-sulfur during entrained gasification. A high-volatile bituminous coal was pulverized to a mass mean of near 50 ..mu..m. The coal was gasified with oxygen in a laboratory-scale entrained-flow gasifier. Test pressures were atmospheric (1.0 atm, 101 kPa), 4.9 atm (500 kPa), and 10.4 atm (1050 kPa). Oxygen-to-coal mass ratios between 0.6 and 1.1 were investigated. Gas-particulate samples were collected with a water-quenched probe from the gasifier chamber effluent stream. Measurements were made of the sulfur retained in the char particles and of the concentrations of H/sub 2/S, SO/sub 2/, COS, and CS/sub 2/ in the product gas. Conversion of sulfur to the gas phase was observed to decrease with increasing pressure, possibly through sulfur capture by char. Changing pressure caused a change in the distribution of gas phase sulfur species. At higher pressure, the proportions of SO/sub 2/ and CS/sub 2/ decreased, and the proportion of H/sub 2/S increased. This redistribution with increasing pressure is not predicted by equilibrium calculations, nor was it observed in leaner (less particle laden) combustion environments. This suggests the importance of char in determining the fate of the coal-sulfur during gasification. Increasing oxygen-to-coal mass ratio increased sulfur conversion, SO/sub 2/ concentration, and COS concentration, while it decreased H/sub 2/S and CS/sub 2/ concentrations.

• OSTI ID: 5216116
• Report Number(s): CONF-870484-
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
014000* -- Coal
Lignite
& Peat-- Combustion
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
COAL
COAL FINES
COAL GASIFICATION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
EMISSION
ENERGY SOURCES
ENRICHMENT
FOSSIL FUELS
FUELS
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN ENRICHMENT
PRESSURE EFFECTS
REACTION KINETICS
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
YIELDS