U-GAS coal gasification process with in-situ desulfurization

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6022717

Rehmat, A; Abbasian, J; Lau, F

Calcium based sorbents such as limestone and dolomite have been used in conjunction with the U-GAS coal gasification process for in-situ capture of sulfur present in the coal. Under the reducing conditions of the gasifier, these sorbents react with sulfur compounds to form calcium sulfide. As a unique feature of the U-GAS process, the calcium sulfide could be further reacted with air in the ash discharge zone to form calcium sulfate, which is environmentally acceptable for disposal directly from the gasifier along with the agglomerated ash. The Institute of Gas Technology (IGT) has conducted considerable testing in this area under different programs. The suitability of dolomite as in-situ sulfur capturing agent has been verified in U-GAS process using high-sulfur Pittsburgh coal. The gasification tests were conducted at 1850{degree}F in pressure ranges of 100 to 450 psig. The kinetics of the reaction between calcium based sorbents and hydrogen sulfide at these gasification conditions have been derived separately using a thermogravimetric technique. Effect of temperature, pressure, and particle size on the reaction rate were also included in these latter tests. Furthermore, the operating conditions and the type of sorbents suitable for achieving maximum calcium conversion to calcium sulfate during the oxidation step of the process have also been identified. 9 refs., 8 figs., 10 tabs.

• Research Organization: Institute of Gas Technology, Chicago, IL (USA)
• Sponsoring Organization: DOE/FE; IGT
• DOE Contract Number: AC21-87MC24266
• OSTI ID: 6022717
• Report Number(s): CONF-900859-1; ON: DE91008387
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
010404* -- Coal
Lignite
& Peat-- Gasification
ALKALINE EARTH METAL COMPOUNDS
BITUMINOUS COAL
BLACK COAL
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CALCIUM SULFIDES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
DESIGN
DESULFURIZATION
DOLOMITE
ENERGY SOURCES
FLUIDIZATION
FLUIDIZED BEDS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MINERALS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
REACTION KINETICS
REDUCTION
ROCKS
SEDIMENTARY ROCKS
SORPTIVE PROPERTIES
SULFATES
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
TESTING
THERMOCHEMICAL PROCESSES