Selas/Pyronics radiant tube burners are recuperative style and available as single-end model (SER), direct-fired model (UHF), or highest-efficiency model, Energy SabreTM 600.
In a furnace operating with a conventional radiant tube combustion system, 65 to 70% of the heat created by combustion is wasted in the flue gas. A single-ended recuperative radiant tube combustion system reduces that wasted heat dramatically since it uses up to 70% of the available exhaust gas heat to preheat incoming combustion air, so the furnace’s fuel consumption is reduced significantly.
The result is average fuel savings of up to 50%. The patented SER is a complete system, combining a burner, radiant tube and recuperator in a single, compact unit. It comes with all the accessories needed, from adjustable gas cocks to valves and ignition system.
Using Spin-Works HeatCor™ technology in conjunction with a second heat exchanger (the Dual-Finned Combustor Tube), the Energy Sabre 600 is a recuperative gas burner transfering a larger portion of combustion exhaust heat back to the burner air supply, and providing high preheat temperatures. The radiant tube burner design has been optimized to offset the high preheat temperatures using high velocity, staged combustion.
The Selas DNS Nozzle Mix burner features a unique cup-like design that allows combustion air and fuel gas to quickly and thoroughly mix at the nozzle. An igniter is then used to start combustion of the air/gas mixture, subjecting it to turbulence so that it burns rapidly and completely within a small area as it sweeps across the cup. This distributes fully reacted combustion products into the furnace where the hot gas heats the work directly. The products of combustion are broadly distributed so they transfer heat to the work evenly, minimizing the localized overheating often caused by concentrated impingement from flame-type burners. The combustion is complete within the cup, so the heat exiting from the cup is uniform, stable and highly controllable. By contrast, the combustion of conventional flame-type burners takes place over a longer period of time with temperature and heat transfer characteristics varying over the length of the flame.
Selas Single Tunnel/Multiple Tunnel Nozzle Mix Burners are designed for extremely wide turndown ranges. Gas and air are mixed only at the point of discharge, flashback is prevented.
Exclusive stepped tunnel design creates very high turbulence and internal recirculation in the flame. The combustion tunnel shape produces pressures in the flame that are lower than the furnace pressure aiding flame retention.
Ignition of main flame is smooth and stable in all sizes. Hot refractory surfaces on the blocks are not required for ignition. All sizes may be lighted and raised immediately to high fire with excellent flame stablility.
The Selas XNM Series Excess Air Burners for single tunnel cool flame application are nozzle mixing types designed for 800% excess air. A unique design and stepped tunnel burner blocks produce excellent flame stability at all firing rates. New air-gas mixing principles produce very high excess air combustion without appreciable fumes at lower equipment costs. All sizes develop maximum ratings with 6 oz. air pressure and 2.5 oz. gas pressure at the burners. All XNM burners have inconel flame distributors and high temperature refractory blocks. Gas adjustor and flanged connections are standard. Pipe unions are not normally required. The integral mounting flange is designed for sealed firing in positive, neutral, or negative combustion chambers.
The Selas High Velocity Single Tunnel Hot Shot (HS) series is used primarily where a high recirculation rate of the products of combustion is required. They produce a high-velocity stream of hot gases at the exit of the burner tunnel which will give a high degree of heat penetration into the work in a furnace. The result being greater efficiency with reduced fuel costs. Burners can also operate with excess air or fuel providing additional versatility in process applications. (For Dual-Fuel Hi-Velocity Burners, see Bulletin 3640).
The Hot Shot Dual Fuel (HSDF) series is a nozzle-mixing high velocity burner which will burn most gaseous fuels as well as light distillate oils. With either fuel being used the products of combustion are high velocity gases which provide fast penetration and improved temperature uniformity to the work in a furnace. As a result, greater efficiency is obtained and greater fuel savings realized. Being able to switch from one fuel to another without interruption gives the user great versatility in areas where gaseous fuels may be curtailed. The HSDF series will operate on ratio and with excess air or gas for additional versatility.
The burner’s outer tube is made of advanced silicon carbide and the inner firing tube is made of stainless steel alloy. The high velocity burner incorporates two-stage combustion for low NOx. Specifically designed nozzles provide cool NOx-inhibiting first stage combustion. Final combustion occurs in the second stage area where combustion products exit at velocities of over 275fps (83mps) for medium velocity and 400fps (122mps) for high velocity.
Cool Flame series XDF dual fuel excess air burners are nozzle mixing oil or gas units designed for up to 350% excess air or on ratio firing. A unique stepped tunnel design produces excellent flame stability at all firing rates.
All sizes are designed for turndown of ten to one on ratio with 16 oz. combustion air pressure. Pressure balancing of gas zero governor and oil-air ratio regulators provides constant fuel to air mixes for on ratio firing over the turndown range. The burner is designed for sealed firing in positive, neutral or negative pressure combustion chambers.
The swirling air stream of the Selas Sidewinder II Gas Flat Flame Excess Air Burner produces a negative vortex at the refractory block mouth. Gas enters the vortex, mixing rapidly, producing intense combustion. The inverted parabolic shape of the burner block port works with the vortex to pull flames flat to the furnace wall at firing rates and mixtures.
Description
Sidewinder Gas Burners are
nozzle-mixing units with a high
velocity, spinning, air flow. The swirling air stream
produces a negative vortex at the refractory block mouth.
Gas enters the vortex, mixing rapidly, producing intense
combustion. The inverted parabolic shape of the burner block
port works with the vortex to pull flames flat to the
furnace wall at firing rates and mixtures.
