OCR Text |
Show There are parameters in combustion and flame promulgation which cannot be altered to any large degree if flame stability and furnace combustion safety are to be adhered to. However, this does not exclude all changes to achieve new criteria. For example, because of the inherently high fuel cost experienced in Europe, it has become an economic necessity to improve combustion efficiency without compromise to environmental requirements. For another example, although N0X emissions are not a consideration in Europe, we, however, consider the technology previously developed by European combustion engineering companies to be a logical starting point for a further technological breakthrough and adaptation to other combustion applications. It is our feeling that reductions in N0X emissions through burner design can be practically achieved without compromise to particulate, SO3, CO, and O2 emissions. The low excess air burner designs offered by European burner manufacturers, mainly British, have a long history of continued operation at very low oxygen levels with acceptable particulate, SO3, CO, and 02 emission levels. It has been identified and widely accepted by the scientific community that combustion of fuels at low oxygen levels has a favorable effect on the development of N0X; therefore, there is at least one common denominator between existing and new technologies. Another major influence on N0X development is "off-stoichiometric", or "two-stage" combustion, which has an infinity with 12-12 |