Development of a hot gas cleanup system

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

OSTI ID:6818460

Anderson, G L; Berry, F O

Numerous studies have been performed comparing different approaches to integrating coal gasifiers with electric power production technologies such as gas turbines and molten carbonate fuel cells. Each of these studies concluded that, if the fuel from the gasifier could be cleaned at an elevated temperature, the cost of electricity from the plant could be significantly lowered. IGT has been exploring a process for removing sulfur-containing compounds from 1000/degree/ to 1200/degree/F coal-derived fuel gases. The process uses a mixture of metal oxide-containing sorbents that react with the sulfur-containing compounds. The metal oxide-containing sorbents currently being explored for the process are 1) a zinc oxide-on-zinc aluminate sorbent and 2) a cobalt titanate-on-titania sorbent. The two sorbents are segregated into separate beds. The sulfur-containing fuel gas first comes into contact with the cobalt titanate-containing sorbent where more than 67% of the sulfur is removed. The partially desulfurized fuel gas then comes into contact with the zinc oxide-containing sorbent where the sulfur content of the fuel gas is reduced to less than 20 ppM (v). The sulfur is recovered as elemental sulfur rather than SO/sub 2/ or H/sub 2/S and there is no tail gas from the process. Regeneration of the mixture is performed with pure O/sub 2/ and a recirculating stream of SO/sub 2/. The SO/sub 2/ from this reaction is then combined with the recirculating stream of SO/sub 2/ to regenerate the cobalt titanate-containing sorbent. The recirculating stream of SO/sub 2/ is required because this radiation is thermodynamically limited. The product gas contains both elemental sulfur and SO/sub 2/. The elemental sulfur is removed from the SO/sub 2/ by cooling and condensation and the SO/sub 2/ is recycled back to the cobalt titanate bed undergoing regeneration. IGT also began to develop a process for removing HCl and other trace contaminants from 1000/degree/ to 1200/degree/F fuel gases.

• Research Organization: Institute of Gas Technology, Chicago, IL (USA)
• DOE Contract Number: AC21-85MC22144
• OSTI ID: 6818460
• Report Number(s): CONF-870659-8; ON: DE88017162
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ADSORBENTS
CARBON COMPOUNDS
CARBON OXYSULFIDE
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
COBALT COMPOUNDS
DESULFURIZATION
ECONOMICS
ELEMENTS
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HOT GAS CLEANUP
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
RECOVERY
REGENERATION
REMOVAL
SULFIDES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC OXIDES