Molten carbonate fuel cell powerplant desulfurization systems. Final report, November 1978-November 1979
With an objective to contribute to the integration of coal gasifier with advanced power generation systems, such as molten carbonate fuel cells, this study has investigated high-temperature, regenerable, desulfurization processes in which the H/sub 2/s content of coal gases is reduced from 200 ppM to 1 ppM. Commercially available processes involve very low temperature scrubbing prior to use in the fuel cells and, consequently, introduce penalties in capital cost and system efficiency. As a result of a systematic thermodynamic screening, four candidates (ZnO, V/sub 2/O/sub 3/, Cu and WO/sub 2/) show feasibility for intermediate to high temperature (350 to 700/sup 0/C) desulfurization of fuel gases derived from coal. Of these, ZnO was experimentally studied using a bench scale, isothermal packed bed reactor. It was demonstrated that ZnO can reduce the sulfur levels to less than 1 ppM from coal gases at 650/sup 0/C, and it can be completely regenerated to ZnO. However, severe decrease in sulfur capacity at high temperatures and further degradation upon regeneration were observed. Electron microscopy, microanalysis, and surface area measurements were obtained and examined in conjunction with a pore plugging model for this type of gas-solid reaction. Evidence is presented to conclude that the combination of pore plugging during sulfurization and sintering during regeneration reaction are two major causes for the observed decrease in its activity of the sorbent.
- Research Organization:
- Giner, Inc., Waltham, MA (USA)
- DOE Contract Number:
- AC03-78ET15370
- OSTI ID:
- 5133848
- Report Number(s):
- DOE/ET/15370-T1; ON: DE83006791
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
30 DIRECT ENERGY CONVERSION
COPPER OXIDES
COMPARATIVE EVALUATIONS
DESULFURIZATION
FUEL GAS
HOT GAS CLEANUP
FUELS
SPECIFICATIONS
MOLTEN CARBONATE FUEL CELLS
TUNGSTEN OXIDES
VANADIUM OXIDES
ZINC OXIDES
BENCH-SCALE EXPERIMENTS
BENFIELD PROCESS
COAL GASIFICATION
CONSOL FGD PROCESS
EXPERIMENTAL DATA
FEASIBILITY STUDIES
GIAMMARCO VETROCOKE SULFUR PROCESS
RECTISOL PROCESS
SELEXOL PROCESS
STRETFORD PROCESS
TEMPERATURE DEPENDENCE
THERMODYNAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
DATA
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
FLUIDS
FUEL CELLS
GAS FUELS
GASES
GASIFICATION
HIGH-TEMPERATURE FUEL CELLS
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
VANADIUM COMPOUNDS
ZINC COMPOUNDS
010404* - Coal
Lignite
& Peat- Gasification
300503 - Fuel Cells- Materials
Components
& Auxiliaries