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What is the material of your rotary carbonization furnace ?
The inner and middle layers are boiler steel, which can withstand high temperatures of about 500℃; the outer layer is made of stainless steel, which can withstand high temperatures above 600℃.
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How long does it take to generate enough gas to heat the furnace after the machine is turned on? (Or, how long does it take to use external fuel after starting up?)
1-2 hours.