TRANSJET® LOW NOx BURNER

The Transjet is an internal recirculating, low excess air, low emissions, radiant flame burner.

Principles of Operation

• SELECTIVE RECIRCULATION - In the Transjet burner, furnace gas, rather than flue gas, is internally recirculated. The recirculated gas encapsulates the flame in a sheath, with little or no recirculation occuring at the center of the flame front. This distribution of recirculated gas is assured by the use of a patented configuration using a recirculation sleeve and is referred to as "selective recirculation." This staging technique avoids the complexity of external ductwork and blowers to move the recirculated gas.
• RADIAL STAGING - The Transjet uses "radial staging" in place of the more cumbersome "tangential staging." With "tangential staging," the final 10% to 20% of combustion air is introduced downstream in the furnace to complete the combustin process. In the "radial staging" concept, the center core of the burner is designed to operate at an equivalence ratio of 0.7 to 0.9. The NOx generated in the combustion process due to fuel-bound nitrogen, or due to the fixation of atmospheric nitrogen (thermal NOx) earlier in the combustion process is reduced in the core. A sheath of combustion air and recirculated gas surrounds and mixes with the core to complete the combustin process as the flame travels down the furnace.
• LOW EXCESS AIR - The recirculated furnace gas contains carbon dioxide at elevated temperatures. At elevated furnace temperatures, carbon dioxide is as effective an oxidizer as atmospheric oxygen. The recirculated gas (CO₂) in the sheath surrounds the flame front and serves to oxidize the carbon particulate generated by the rich core. The particulate, i.e. smoke, generated by the core is thereby substantially reduced. For example, Transjet burners operating at an overall stoichiometric ratio of less than 1, have operated without generating appreciable smoke. Mixtures of 50% coal and 50% residual oil have been burned in the Transjet with 2.5% excess air and stack Bacharach readings of 4.

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