Development of a hot gas cleanup system for integrated coal gasification/molten carbonate fuel cell power plants

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6910072

Anderson, G L; Berry, F O; Harmon, B D; Laurens, R M; Biljetina, R

During the past year, IGT has been conducting bench-scale studies on a conceptual high temperature fuel gas desulfurization process known as the mixed metal oxide process. The objective of this process is not only to remove the sulfur-containing compounds from hot (>1000/sup 0/F) fuel gases to ppM levels, but also to directly recover this sulfur in its elemental form. The subject of these studies has been the use of a 90% by weight cobalt titanate/10% by weight zinc oxide mixture. Although the mixture performed reasonably well under eleven (11) cycles of testing, the results suggest that additional improvements in the sorbents are needed. To remove more than 99% of the fuel gas sulfur at 1300/sup 0/F requires space velocities of less than 300 h/sup -1/ and space velocities of <100 h/sup -1/ are probably required to achieve good elemental sulfur production during regeneration of the mixture. Both of these findings indicate the need for improved sorbent reactivity. IGT has also recently completed preliminary process economic studies on both the mixed metal oxide process for high temperature fuel gas desulfurization and the use of a composite molten alkali carbonate/ceramic sorbent developed by IGT for high temperature HC1 removal. The process economic studies on the mixed metal oxide process examined six (6) different configurations. These studies indicate a probable cost of between 6 and 20 mills/kWh depending upon the configuration. The least costly configuration was one in which oxygen rather than air was used to regenerate the sulfided sorbent mixture. However, IGT has not yet conducted any tests on this configuration to determine whether it is technically feasible. The process economic studies on the composite molten alkali carbonate/ceramic sorbent for high temperature HC1 removal indicate a probable cost of about 5 mills/kWh when applied to a feed gas containing about 300 ppM HC1. 3 refs., 7 figs., 6 tabs.

• Research Organization: Institute of Gas Technology, Chicago, IL (USA)
• DOE Contract Number: AC21-82MC19403
• OSTI ID: 6910072
• Report Number(s): CONF-850522-3; ON: DE87003951
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
&amp; Peat-- Purification &amp; Upgrading
30 DIRECT ENERGY CONVERSION
300103 -- MHD Generators-- Materials
Components
&amp; Auxiliaries
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
COBALT COMPOUNDS
DESULFURIZATION
DIAGRAMS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
FLOWSHEETS
FLUIDS
FUEL CELL POWER PLANTS
FUEL CELLS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HIGH-TEMPERATURE FUEL CELLS
HOT GAS CLEANUP
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INORGANIC ACIDS
LITHIUM CARBONATES
LITHIUM COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MOLTEN CARBONATE FUEL CELLS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
PURIFICATION
RECOVERY
REMOVAL
SODIUM CARBONATES
SODIUM COMPOUNDS
SORBENT RECOVERY SYSTEMS
SULFIDES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC OXIDES