What is an appropriate heating rate for a tubular furnace?
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For a heating furnace that has been used normally, after being shut down for a period of time, what is considered an appropriate rate of temperature increase? In my personal opinion, once the permanent light is turned on, a rate of 40 degrees per hour is appropriate, as this helps to prevent an excessive supply of gas and thus avoids safety risks associated with incomplete combustion
If the insulation material in the furnace is replaced, the rate must be 30°/h, and the burners need to be used alternately in order to remove the crystals. In cases other than the above, it is generally 50°/h
Assuming it is an old furnace, not one that has been newly built or repaired, and continues to be used after a period of downtime
The rate of temperature increase varies depending on the type of refractory material used. Of course, the humidity of the refractory material also affects this rate of increase; if the humidity is high, the temperature will rise more slowly than under normal conditions.