Hot-gas cleanup for molten carbonate fuel cells-dechlorination and soot formation. Final report, May 19, 1981-July 19, 1983
Two separate aspects of hot-gas conditioning for molten carbonate fuel cells (MCFC) were investigated under this contract: potential high temperature chloride sorbent materials were sreened and tested and carbon deposition on MCFC components was studied experimentally to determine guidelines for maximizing MCFC efficiency while avoiding carbon fouling. Natural minerals containing sodium carbonate were identified as the most promising candidates for economical removal of chlorides from coal gasifier effluents at temperatures of about 800 K (980/sup 0/F). The mineral Shortite was tested in a fixed bed and found to perform remarkably well with no calcination. Using Shortite we were able to achieve the program goal of less than 1 ppmV chlorides at 800 K. Shortite is an abundant mineral with no competing commercial demand, so it should provide an economical chloride cleanup sorbent. Measurements showed that carbon deposition can occur in the equilibrium carbon freee region because of the relative rates of the relevant reactions. On all surfaces tested, the Boudouard carbon formation reaction is much faster than the water-gas shift reaction which is much faster than the methanation reaction. This means that the normal practice of adding steam to prevent carbon formation will only succeed if flows are slow enough for the water shift reaction to go substantially to completion. More direct suppression of carbon formation can be achieved by CO/sub 2/ addition through anode recycle to force the Boudouard reaction backward. Addition of steam or CO/sub 2/ must be minimized to attain the highest possible MCFC efficiency. 28 references, 31 figures, 22 tables.
- Research Organization:
- Physical Sciences, Inc., Andover, MA (USA)
- DOE Contract Number:
- AC21-81MC16242
- OSTI ID:
- 6710630
- Report Number(s):
- DOE/MC/16242-1554; ON: DE84003072
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Hot-gas cleanup for molten carbonate fuel cells: dechlorination and soot formation. Quarterly report, September 16-December 15, 1982
Hot-gas cleanup for molten-carbonate fuel cells. First quarterly report, 19 May 1981-31 July 1981
Related Subjects
01 COAL, LIGNITE, AND PEAT
CARBON
DEPOSITION
CHLORIDES
ADSORPTION
FUEL GAS
DECHLORINATION
HOT GAS CLEANUP
ADSORBENTS
MOLTEN CARBONATE FUEL CELLS
FOULING
FUELS
SHORTITE
SORPTIVE PROPERTIES
CARBON DIOXIDE
EXPERIMENTAL DATA
HIGH TEMPERATURE
RESEARCH PROGRAMS
SODIUM CARBONATES
SOOT
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
DATA
DEHALOGENATION
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
FLUIDS
FUEL CELLS
GAS FUELS
GASES
HALIDES
HALOGEN COMPOUNDS
HIGH-TEMPERATURE FUEL CELLS
INFORMATION
MINERALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
SODIUM COMPOUNDS
SORPTION
SURFACE PROPERTIES
300503* - Fuel Cells- Materials
Components
& Auxiliaries
010402 - Coal
Lignite
& Peat- Purification & Upgrading