Excess Air Fuel / Gas Burner - 3422

Lighting / Flame Supervision

A Pilot Set normally is used to light 3422 Burners. On gas, direct spark ignition of the burner is available. A manual torch can be used in some applications. Burners accept ultraviolet (UV) scanners for monitoring pilot or main flame. A flame rod can be used to monitor pilot or main gas fire. When using flame supervision, an interrupted pilot is required — do not use constant or intermittent pilots. If using direct spark ignition, turn off spark after burner lights. An observation port is furnished with all burners. Positions of pilot, flame detector, and observation port are interchangeable as long as pilot and flame detector are mounted in adjacent holes.

Xces Air

Xces air can improve temperature uniformity by avoiding hot spots in front of burners, by churning furnace atmosphere to reduce stratification, and by creating positive furnace pressure to eliminate cold air infiltration. Xces air can give very high effective burner turndown. Thus a furnace used for high temperature work, such as heat treating at 1000°C, with burners firing on air/fuel ratio can also be used for low temperature jobs, such as drawing or drying at 300°C, with burners firing on lean ratio.

Application Temperature

The 3422 burners can be used with chamber temperatures up to 1100°C. If furnace temperature could rise above 850°C after shutdown, some air should be maintained through the burner to prevent overheating.

Construction Features

Air and gas inlets can be rotated in 90° both CW and ACW direction, but air and gas pipes should be brought in from the top or side to prevent oil dripping into them. Mounting plates are cast iron. Burner blocks are 9" long for thicker furnace walls; lining beyond end of tile should be flared at least 30° included angle, starting at tile OD. Extension tiles are not recommended. For installation convenience, burner body can be separated from the mounting plate and tile assembly, but burner block must be set in the wall with pilot and flame detector notches in proper location relative to intended burner body position.

Jacketed Burner Blocks: 3422 Burners have a carbon steel jacket around the burner block for applications where there is no furnace refractory to support tiles and where temperatures require extra support.