xces Air Gas Burner - 1422

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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 (suchas heat treating at 1000oC 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.

Application Temperature

The 1422 burners can be used with chamber temperatures up to 1100oC. If furnace temperature could rise above 850oC after shutdown, some air should be maintained through the burner to prevent overheating.

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

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 1500oC 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.

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)
1 2 7 14 21 28
1422-2A 200 420 910 1270 1500 1920 458 300
1422-3A 360 810 1800 2450 3100 3600 608 450
1422-4A 560 1320 2600 3820 4500 5500 760 450
1422-5A 750 2050 4350 6300 7650 9050 912 500
1422-6A 1600 3100 7200 10300 12700 14750 1216 500
1422-7AA 1900 3400 8100 12100 15000 17300 1520 600
1422-8AA 3100 7250 14000 20200 23100 27000 1520 2000
1422-9AA 3650 8150 16600 23550 28000 32500 1824 2000
1422-10AA 4800 11000 22600 31500 37700 43500 2128 2000
Xces air rates are improved with constant pilotair.