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Surface Combustor

Multi Tunnel Burner Range

An explosive gaseous mixture is supplied into the combustion chamber through a supply pipe from a suitable source, adapted to maintain the pressure in the combustion chamber. This is provided by means of a suitable injector installed in the supply feed.  A pressure in maintained which enables the gaseous mixture to permeate through the diaphragm, ceramic perforated plate, refractory brick or multi tunnel block. 

As the mixture advances through the diaphragm, its velocity will be greatly reduced, and on being ignited, it will burn at the surface, where the velocity equals the area of propagation of inflammation.

The pressure of the gaseous mixture must be regulated sufficiently to maintain the desired pressure in the combustion chamber.  Increase in the mixture supply will cause the flame cap or combustion zone to advance toward the outer face of the diaphragm and decrease in pressure will result in the opposite, but so long as sufficient pressure is maintained in the combustion chamber to cause the mixture to move through the diaphragm with a velocity greater than the rate of propagation of inflammation, and to cause the combustion zone to be located beyond the inner face of the diaphragm, that the inner face does not become heated to a degree sufficient to cause ignition of mixture, black flash and ignition of the mixture, in the combustion chamber will not occur.

Technical Information
Flamaire High Intensity
Premix Gas & Air Multi Tunnel Surface Combustion Burners
Type A - 1000 °C Face Temperature
Type B - 1500 °C Face Temperature

A product of robust construction, having high quality cast iron container, sized to suit the specific application, with non-spalling refractory block, accurately moulded and fitted with mixture jets, made of industrial grade porcelain, extruded to close tolerances. This product is suitable for building into furnace walls etc. and will satisfy a wide variety of process heating applications and conveyorized systems.

The burners operate in conjunction with suitable injectors, premixing medium air pressure and low gas pressure supplies, to a temperature of 1000 degrees C at a minimum air pressure of 5" W.G. for a maximum loading of 500 BTU/Hr per square inch of block face for Type A, and up to 1500 degrees C at a minimum air pressure of 20" W.G. for a maximum loading of 3500 BTU/Hr per square inch of block face area for Type B.  The actual face temperature will depend largely on the method of use and the proximity of the heating load.

The flame burns inside cylindrical tunnels after expanding through the port injector jets built into the combustor block tunnels.  The sides of the tunnels become quickly hot, radiating energy, which heats up the rear wall of the tunnel (including the face of the injector ports).  The face of the block does not radiate in the visible spectrum only radiating infra-red by conducting from the tunnels and infra-red radiation from the gasses emerging from the same.

Heating up time in the open is approximately 20 minutes and cooling time is extended due to the physical and thermal mass o f the blocks.  The burners have a turndown ratio of 3 ½ : 1 for Type A and 7 : 1 for Type B and can therefore be operated at lower ratings than those stated with a corresponding reduction in air pressure.

Care must be taken to prevent overheating of the cast iron container and when built into settings, the container must not be exposed to the interior to the heating chamber 300 degrees C maximum.  When mounted above conveyor systems etc. adequate space must be allowed for exhausting the products of combustion. In all applications a non-return valve must be installed in the gas supply.