XCES AIR GAS BURNER - 1422
EXCESS AIR GAS BURNER 1422
1422 Excess Air Gas Burners are commonly used on heat treat and nonferrous melting furnaces, kilns, ovens, air heaters, dryers, chemical process equipment, and other applications where superior temperature uniformity is required.
PERFORMANCE FROM FUEL RICH TO XCES AIR WITH LOW NOX EMISSIONS
These sealed-in, nozzle-mix burners are stable over a wide range of air/gas ratios from large amounts of Xces air, to stoichiometric (chemically correct air/gas ratio), up to 50% Xces fuel (provided additional air for combustion is supplied to the furnace near the burners). Burners can be ignited at rich, lean, or correct air/gas ratio, then immediately turned to high fire. NOx emissions are low for all air/gas ratios. The most common ratio control system for 1422 Burners uses a cross-connected regulator. When appropriate for the application, fully metered flow systems and fuel only control are very satisfactory. Required gas pressures are low: 2”wg at burner for coke oven gas, less for natural gas.
ADVANTAGES OF 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 1000o C with burners firing on stoichiometric air/gas ratio can also be used for low temperature jobs (such as drawing or drying at 300o C) with burners firing on lean (XcesAir) air/gas ratio. There is a potential increase in fuel consumption because of heating extra air. The benefits, such as better products from improved heating, far outweigh the small increase in fuel costs.
The 1422 burners can be used with chamber temperatures up to 1100o C. If furnace temperature could rise above 850o C after shutdown, some air should be maintained through the burner to prevent overheating.
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
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. Burner is complete with cast iron mounting plate and 9″ long 1500o C castable burner tile which must be supported and sealed in a hard refractory furnace wall. (See page 2 for optional construction suitablefor 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.
|XCES AIR GAS BURNER - 1422|
|Burner Designation||Combustion Air Capacities, scfh (Standard Cubic Feet PerHour) Air pressure Drop Across the Burner in inches of WGP||Approx. Flame length in mm with 27” wg main air (in open furnace)||Maximum percent Xces air* (at inches of WGP & directs park)|
|Xces air rates are improved with constant pilotair.|