Product Overview | 6422 Fire•All™
6422 Fire.All Dual-Fuel Burners are widely used on heat treat and non-ferrous melting furnaces, kilns, ovens, air heaters, dryers, chemical process equipment, and other applications where superior temperature uniformity is required. (For higher temperature service, specify 6425 Burners.) These sealed-in, nozzle-mix burners for gas and/or distillate oil are stable on stoichiometric ratio, with large amounts of excess air, or with up to 50% excess fuel (provided additional air for combustion is in the furnace near the burner). OPERATION Burners can be lighted at rich, lean, or correct air/fuel ratio, then immediately turned to high fire. Required gas pressures are low: 1 osi at the burner for coke oven gas, less for natural gas. Required oil pressure at the burner is nearly zero, but a pressure drop of about 10 psi should be taken across the 1813 Sensitrol™ Valve. The most common ratio control system for 6422 Burners uses a cross-connected regulator and Ratiotrol™. When appropriate for the application, flow balancing systems or fuel only control (see "Excess Air" paragraph) are very satisfactory. If furnace temperatures after shutdown rise above 1900°F, pass some air through burner to prevent overheating. During gas operation, use at least 4 osi atomizing air to cool atomizer; or for extended periods of operation on gas, atomizer can be withdrawn and stored: Use a backplate and gasket to seal rear of burner (see Dimensions & Parts List 4422-2). LIGHTING/FLAME SUPERVISION A 4011-12 pilot set is recommended for individual burner ignition. When multiple burners share a single pilot pre-mix header, a 4021-12 pilot tip per burner with an appropriately sized air/ gas mixer is recommended. On gas, direct spark ignition of the burner is available--see Sheet 4055. 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. Adapters are listed in Bulletin 8832. 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. STANDARD CONSTRUCTION Burner bodies are heat resistant cast iron with Inconel air tubes. Mounting plate and tile assembly can be separated from the burner body for installation convenience. Air and gas connection orientation can be rotated in 90° intervals, but air and gas pipes should be brought in from the top or side to prevent oil dripping into them. When reassembling the burner, the pilot and flame detector notches in the tile and mounting must be in proper alignment with the pilot and flame detector connections on the burner body (applies to 6422-2 through 6422-6 sizes). Burner is complete with cast iron mounting plate and 9" long 3200°F castable burner tile which must be supported and sealed in a hard refractory furnace wall. (See page 2 of Dimensions 6422 for optional construction suitable for fiber lined furnaces.) When the furnace wall is thicker than the tile length, the tunnel beyond the end of the burner tile should be flared at a 30° or greater included angle, starting at the OD of the tile. Extension tiles are not recommended. (See Supplement DF-M1 for detailed tile installation recommendations.
Bulletin 6422 Page 2
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