Combustion of gasification residues in a pressurized fluidized-bed
- Helsinki Univ. of Technology, Espoo (Finland). Dept. of Energy Engineering
Second generation PFBC processes have been presented as possibilities for future power production. However, few results have been presented about fluidized-bed combustion of gasification residues so far. Helsinki University of Technology has studied PFB combustion of gasification residues. This paper deals with the control of the combustion of the gasification residues in a PFB combustor, the combustion properties of the residues and the emissions of nitrogen oxides (NO{sub x} and N{sub 2}O). In the first tests, bed material from a gasifier was used as fuel, while cyclone fines was used as fuel in the second tests. The tests were carried out at the Otaniemi PFBC test rig, which has a maximum thermal input of 130kW{sub th} and maximum pressure of 1.0 MPa. The combustion efficiency for cyclone fines was high, i.e. from 99.5 to 100%. The NO{sub x} emissions during cyclone fines combustion were higher than during bituminous coal combustion tests done earlier at the same test rig. The NO{sub x} emissions increased with increasing air-fuel ratio with both residues and higher NO{sub x} emissions were measured at 6 bar than at 10 bar during the combustion of cyclone fines. The N{sub 2}O emissions were up to 50 ppm and increased with decreasing temperature. The fuel-N conversions to N{sub 2}O were from 0.3 to 3.5 %.
- OSTI ID:
- 245002
- Report Number(s):
- CONF-950522--; ISBN 0-7918-1305-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR POLLUTION CONTROL
BITUMINOUS COAL
CHEMICAL REACTION YIELD
COAL GASIFICATION
CYCLONE SEPARATORS
EFFICIENCY
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
GAS GENERATORS
NITROGEN OXIDES
NITROUS OXIDE
PRESSURIZATION
RESIDUES
SULFUR DIOXIDE
TEST FACILITIES