Product Overview | "Aadvark" High Velocity Burner
AARDVARK FEATURES
The Aardvark is the all-metal version of the Tempest ® high velocity burner, the largest selling nozzle-mix burner in the world. It can be used as an alternate to the Tempest in most installations except those that exceed 2000°F--the 4442A Burner's metal "tile'' should not be exposed directly to temperatures above 1600°F. But if the snout is protected from direct radiation or if combustion air flows through the burner whenever it is at higher temperatures, appropriate furnaces, kilns, etc. are not a problem. The Aardvark often is easier to install than a conventional burner with tile, e.g., screwing the Aardvark's threaded snout directly into a fitting on the metal shell of a fiber wall furnace. This all-metal burner is very useful as a complete, high velocity air heater for drying or other low temperature applications. It can be screwed onto a hot air distribution system to direct its warm or hot gases in a specific pattern or to specific areas. The 4442A Burner can simplify continuous heating of pieces in high speed production line processes. Appropriate Aardvark-fired chambers along the line eliminate need to rout parts to and from separate heat treat facilities. The versatile Aardvark, complete as shown. It fits almost anywhere, delivers high velocity burner products over a wide range of temperatures. In an air heater, Aardvark discharge air temperatures must be high enough to overcome radiation losses in distribution piping, and piping materials must be compatible with those temperatures. If air temperatures do not exceed 1000°F, the Aardvark tile can be insulated to retard heat loss.
Wide Operating Range. Can deliver up to 25,000 scfh of air at any temperature from 300 to 1600°F (or higher per the above). High Velocity. Restricted tile exit forces hot gases to leave the burner at extremely high velocity, optimizing convective heat transfer. Flame Supervision. Monitor with any standard UV or rod de- tector. With UV, the burner can operate with up to 2000% excess air (about 300°F hot mix). With flame rods, excess air is limited to 500% (200% for 4442A-7), which corresponds to about 900°F hot mix. Use a half-wave igniton transformer to avoid UV sens- ing of spark during trial for ignition. If a pilot is used, it must be interrupted within 10 seconds after main burner ignition . Simplified Piping . All primary and "secondary'' air enters the heater through a single connection. Air temperatures can be controlled by throttling fuel only. Simple, Reliable Operation. Lights readily over a wide range of pressures. It is extremely stable--it dœs not have to be "nursed'' if operating conditions fluctuate. Compact Size. As a self-contained, direct-fired air heater, it uses no cumbersome secondary air chamber; so it can fit into tight spaces. Low Pressure Air. Unlike other compact air heaters, the Aard- vark dœs not require compressed air.
Air Capacities, scfh, with 16 osi at burner inlet
Burner designation 4442A-
scfh air
-2
-3
-4
-4-S
-5
-6
-7
Burning on stoichiometric
2330
3540
5800
8 950
9 480
14 900
24 800
air/gas ratio†
Not burning
3000
4190
6480
11 000
10 600
16 700
29 500
(use to size blower)
† When burning, capacities vary slightly with excess air rate.
Bulletin 4442A page 2
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