HF BURNER - 003
HF BURNER - 003
Hot Air Burners are used on steel reheat furnaces, glass melters, non-ferrous melters, rotary calciners, and other applications where low velocity luminous flames are desired. They use combustion air at temperatures up to 600oC. They burn gases of 2000kcal/scf or higher and light or heavy fuel oils.
GAS AS A FUEL
003 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 200oC. For stoichiometric firing, required natural gas pressure at the burner varies from approximately 60% of main air pressure with 10oC air to approximately 25% of air pressure with 550oC air. Retract the oil atomizer during gas operation.
OIL AS A FUEL
Standard 003 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 a 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 some what.) A reliable low pressure atomizer, using 40-70”wg cold air supplied by a turbo blower, is available for most grades of oil when steam or compressed air is unavailable.
003 Burners operate from 0.2″wc main air pressure to10″wc or higher. High fire air rate usually is between 2″wc and 6″wc. Input and air/fuel ratio controls should be selected and engineered for the range ability required. If combustion air temperatures vary considerably during normal operating cycles, metered flow control with air temperature compensation is recommended. When combustion air can be metered on the cold side of the recuperator, it may be acceptable to use differential pressure balanced ratio regulator. However, recuperator leakage can cause significant distortions and variations in air/fuel ratio when “cold lead metering” is used. Axis Thermal field engineers are qualified to recommend the system most suitable for each application.
IGNITION AND FLAME SUPERVISION
A Pilot assembly is normally used to light the burner. Ignition sequence should provide for low fire start between 0.2 and 1.0″wc main air pressure. Pilot mixture pressure should be 3″wc or more. The Honeywell UV detector has been tested on 003 Burners.
003 CAPACITY–WITH ATOMIZER
|Burner Size||Main Air, scfh 550o C air at 4.5"wc AP||Oil,l/hr based 1400ft 3 air for each oil||Steamat 5kg/cm2||(No Oil)||Atom. Sir,scgm at 5kg/cmi(Oil Flow rate)||(No Oil)|
|Atomizer Designation||(Oil Flow rate)|
|-8A||19000 scfh||A56 lt/hr||002-01||50.6