Heating characteristics of carbon-based materials under microwave irradiation

To study the effect of microwave power,particle size and carrier gas flow rate on temperature-rising behavior of activated carbon,the heating experiments of activated carbon are conducted using microwave heater.The results reveal that the heating rate of wooden activated carbon and coal-based activated carbon increases with the increase of microwave power.The highest temperature is also improved as microwave power rise.When the power increases from 240 W to 400 W,the average temperature obtained by wooden activated carbon has a rise up to 93 ℃ at the period of 10-16 min.Such difference in wooden activated carbon is significantly greater than that in coal-based activated carbon.Increasing particle size of wooden activated carbon results in a decrease in the heating rate and final temperature.Further,heating rate and the maximum temperature are slowed down with increasing the carrier gas flow rate.The favorable conditions for temperature-rising of activated carbon with microwave heating are microwave power of 400 W,activated carbon particle size of ≤1 mm and carrier gas flow rate of 60 L/h.