Furnace Blackening Technology (FBT)
is aimed at improving the efficiency of the fire chambers in furnace industrial devices.
Modern refining and petrochemical processes Furnaces are designed in such a way that the main heat load is transmitted through radiant heat exchange in the Radiation Chamber of the Furnaces. The ratio of thermal load between the Radition and Convection Sections is 80% to 20%, respectively. Therefor, in terms of energy consumption and energy efficiency of the entire Furnace apparatus, the Radiation Chamber is given increased attention.
FB Technology is implemented by combination of three factors of radiant heat exchange in furnace, namely:
- so-called "luminosity" or "blackness" of the torch;
- emission coefficient of the secondary reflector - refractory surface in the combustion chamber of furnace;
- blackness coefficient of heated surfaces - screens or pipes for heating of raw materials.
High-Emissivity Ceramic (HEC) Coatings are designed to increase the blackness of the refractory surfaces and heated surfaces in the Radiation Chambers of heating and reaction Furnaces.
At the same time, it is known that the main structural materials used for refractory the radiation chambers of furnaces reduce their Blackness Coefficient (BC) with increasing temparture. For example, the Blackness Coefficient of ceramic fibre material decreases dramatically from 0.75 to 0.45 (by 40%) when the temperature increases from 20 to 1000 degrees Celsius.
Dependence graph of the Blackness Coefficient on Temperature for refractory materials
At the same time, the Coefficient of High-Emissivity Ceramic (HEC) coatings does not significantly change its value of 0.92 or higher.
Thus, by applying HEC coatings to the internal surfaces of the Radiation Chamber, it is possible to achievean increase in the efficiency of transmitting radiant energy due to the consistently High Blackness of the furnace combustion chamber.
