Gas As A Fuel

5002 Burners provide soft luminous flames when burning natural or coke oven gas in large open furnaces, such as slab or billet heaters. Flame shapes depend on forward velocity of the burning gases. Although rated nominally at 4.5"wc (550°C) air, flames tend to develop full length at combustion air pressures of 2-3" wc at the burner.

Gas flames are stable when starting with ambient temperature combustion air in cold, tight chambers; but well defined flame shapes may not develop until air is over 200°C. For stoichiometric firing, required natural gas pressure at the burner varies from approximately 60% of main air pressure with 10°C air to approximately 25% of air pressure with 550°C air. Retract the oil atomizer during gas operation.

Oil As A Fuel

Standard 5002 Burners use high pressure “tip emulsion” atomizers with 5 to 6 kg/cm2 steam or compressed air. Resultant clean, highly luminous, well-defined flames are slightly shorter than natural gas flames. Heavy oils #4 through #6 must be heated to reduce viscosity to 100 SSU or less at the burner.

This atomizer is highly efficient, consuming less than one pound of 5 kg/cm2 steam, or 20 ft3 of 80 psi air of #6 oil burned. Lower firing rates reduce this efficiency somewhat. A reliable low pressure atomizer, using 40- 0”wg cold air supplied by a turbo blower, is available for most grades of oil when steam or compressed air is unavailable.