Furnace wall issues
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What is the allowable heat flux density for a typical furnace wall? What is the allowable temperature for the outer wall of the furnace? Where can I find the above parameters? Thank you!
The surface temperature of the furnace wall is generally 50 degrees Celsius, as specified in the boiler design manuals.
The allowable heat flux density is related to the temperature inside your furnace and the properties of the refractory materials! It is generally required that the temperature of the outer surface of the furnace wall should not exceed 50 degrees, when the ambient temperature is 25 degrees! The thickness of the furnace wall is related to the refractory and insulating materials you choose!
When designing the furnace wall, one first determines the temperature of the inner wall of the furnace; the temperature of the outer wall is generally ≤50°C. The thermal resistance of each layer of the furnace wall can be calculated, but there should be a limit for the heat flux density obtained as a result. Otherwise, how can the thickness of each layer of the furnace wall be determined? I calculated one case in which the heat flux density reached 700 W/m2, which seems unreasonable; however, no problems arose after actual production. I’m not sure whether it’s a calculation issue or something else.
The temperature on the inner wall of the furnace should not exceed 850 degrees, I believe; I’m referring to the furnaces used in crude oil vacuum distillation