Challenge
The customer needed a flame-free, clean drying method with precise temperature control, and combustion heat sources were impractical on site.
Solution
A Φ1m×12m electromagnetic-heating rotary dryer was selected: eddy currents in the drum metal generate heat from the inside out, with no combustion and no exhaust. Inlet and outlet temperatures are shown in real time with over-temperature alarm and interlock. Parameters were set to the material and conditions on site.
Result
The machine was delivered and put into service, running with internal heating and stable ramp-up and temperature control, meeting the flame-free and clean process requirement.
Equipment in this case
Electric/Electromagnetic Heating Dryer
Capacity varies with operating conditions and is confirmed by a trial run; parameters fixed by machine size, such as air volume, can be stated precisely.
Related questions
Electric heating or steam heating?
The choice mainly follows the site energy supply:
Steam heating
Suits plants that already have a boiler or steam piping. Running cost is relatively lower and it fits long continuous production.
Electric / electromagnetic heating
Suits sites with no steam supply, requiring no piping, with flexible deployment and fast start-up. The electromagnetic series handles roughly 200–5000 kg/h, provided the electrical capacity matches.
How to decide
Check whether a boiler exists, whether electrical capacity is sufficient, and which running cost is lower over time. With adequate power and no steam, electric heating is the simpler choice.
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