Fuel processing for fuel cells: a model for fuel conversion and carbon formation in the adiabatic steam reformer

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5270218

Bett, J A.S.; Cutlip, M C; Foley, P F; Lesieur, R R; Meyer, A P; Sederquist, R A; Setzer, H J

In present fuel cell power plants the fuel processor is a catalytic steam reformer which is limited to the use of fuels such as naphtha and natural gas. The sulfur content of these feeds must be reduced to low levels by hydrotreatment before contacting the nickel catalyst in the reformer. However, future fuel cell power plants may be required to ue coal-derived liquid fuel or heavy petroleum distillates which are more difficult to hydrotreat and reform. To meet this requirement, an adiabatic steam reformer is being developed by United Technologies Corporation with the support of the Electric Power Research Institute. In the adiabatic reformer, air is added to the process stream to provide, by combustion, the heat for endothermic reforming in a catalyst bed. In the inlet section of the reformer, air and fuel combust, and reforming is initiated on special catalysts whose primary functon is to prevent formation and accumulation of carbon. Following the inlet section, catalysts with high activity for steam reforming complete the conversion of the remaining fuel, principally methane. The objective of the present program is to establish a reactor model for the adiabatic reformer which would predict process stream compositions and temperatures and include carbon formation processes. Progress is reported on the four tasks: (1) determine rate expressions for catalytic reactions occurring in the adiabatic reformer; (2) establish a reactor model to predict process stream compositions in the adiabatic reformer using data from Task 1 for cataytic reactions and data from the literature for homogeneous gas-phase reactions; (3) determine critical conditions for carbon formation on selected catalysts using microbalance experiments; and (4) establish a model to predict carbon formation by combination of the model for process stream composition from Task 2 and data for carbon formation from Task 3. (WHK)

• Research Organization: United Technologies Corp., South Windsor, CT (USA). Power Systems Div.
• DOE Contract Number: AC21-80MC14395
• OSTI ID: 5270218
• Report Number(s): DOE/MC/14395-1183; ON: DE82014197
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080103 -- Hydrogen-- Production-- Steam Reformer Processes
30 DIRECT ENERGY CONVERSION
300503* -- Fuel Cells-- Materials
Components
& Auxiliaries
ALKANES
ALKENES
AUTOTHERMAL REFORMER PROCESSES
CARBON
CATALYSIS
CATALYSTS
CHEMICAL REACTIONS
CHEMICAL REACTORS
DESULFURIZATION
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CELLS
ELEMENTS
ETHANE
ETHYLENE
FUEL CELL POWER PLANTS
FUEL CELLS
FUEL SYSTEMS
GAS GENERATORS
HYDROCARBONS
HYDROGEN GENERATORS
HYDROGEN PRODUCTION
MATHEMATICAL MODELS
METALS
METHANE
NICKEL
NONMETALS
ORGANIC COMPOUNDS
POWER PLANTS
REFORMER PROCESSES
SULFUR
TRANSITION ELEMENTS