微波辐照下炭材料升温特性试验研究

为研究微波功率、活性炭粒径、载气流速对活性炭升温规律的影响,利用微波加热综合试验平台进行活性炭微波加热升温试验,研究了不同因素下活性炭的升温特性。结果表明:相同前提下,随着微波功率的增大,2种活性炭(木质活性炭、煤质活性炭)的升温速率不断加快,最高温度随之提高,微波功率从240~400 W时,木质活性炭在10~16 min平均温度增幅达93℃,明显大于煤质活性炭;增加粒径导致木质活性炭达到的最终温度有所降低,且升温速率减小;提高载气流速可减缓木质活性炭的升温速率并降低其最高温度。获取最高活性炭温度的最佳试验工况为微波功率P为400 W、活性炭粒径d≤1 mm、载气流速Q为60 L/h。

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 obtaiued 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.