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Ecological aspects of combustion devices (with reference to hydrocarbon flaring)
Author(s) -
Swithenbank J.
Publication year - 1972
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690180315
Subject(s) - combustion , combustor , soot , pollutant , environmental science , air–fuel ratio , hydrocarbon , waste management , environmental engineering , nuclear engineering , chemistry , automotive engineering , engineering , internal combustion engine , organic chemistry
Some fundamental factors controlling the emission of pollutants by an industrial combustion system are illustrated by reference to gaseous hydrocarbon flare stack combustion. The formation of smoke (soot), radiation, and nitric oxide may be controlled by limiting of the premixed fuel air ratio to moderately rich mixtures. The factors which determine the design of a suitable Canada mixer are shown to be area ratio, density ratio, and pressure ratio. An important pollutant for large burners is the combustion roar. Fuel type and mixture ratio only affect the combustion noise output by about 5 db. The dominant factor in the generation of this noise is the burner turbulence, which can be controlled to reduce the combustion roar by up to 20 db. Burner cost considerations lead to the current use of simple flare tips; however, the eventual use of more technically sophisticated low pollution units is inevitable.