Process conditions for operation of ignition catalyst for natural gas combustion
A process for starting a combustion system to catalytically combust carbonaceous fuels with air in a combustor in the presence of a palladium oxide containing catalyst is described, which comprises: (a) predetermining a decomposition onset temperature at which the palladium oxide containing catalyst decomposes at an oxygen partial pressure equal to that found in the combustor; (b) predetermining a reformation onset temperature at which the palladium oxide containing catalyst will at the said same oxygen partial pressure found in the combustor, reform into palladium oxide after being subjected to the decomposition temperature; (c) utilizing a flow of hot gases from a pre-burner to heat said catalyst to a first temperature in excess of the decomposition onset temperature of the catalyst; (d) thereafter reducing the flow of hot gases from the pre-burner while supplying air and fuel for combustion to the combustor downstream of said preheater; (e) thereafter restoring catalytic activity by lowering the temperature of the catalyst to the reformation onset temperature and maintaining the temperature at or below the reformation onset temperature until desired catalytic activity is achieved and thereafter maintaining the catalyst below the aforesaid decomposition onset temperature.
- Assignee:
- Engelhard Corp., Iselin, NJ (United States)
- Patent Number(s):
- US 5214912; A
- Application Number:
- PPN: US 7-776907
- OSTI ID:
- 6421769
- Resource Relation:
- Patent File Date: 16 Oct 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYTIC COMBUSTORS
TEMPERATURE CONTROL
NATURAL GAS
COMBUSTION
PALLADIUM OXIDES
CATALYTIC EFFECTS
CATALYSTS
DECOMPOSITION
HEATING
START-UP
SYNTHESIS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTORS
CONTROL
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
034000* - Natural Gas- Combustion