准东煤焦的微波放电特性

通过微波辐照准东煤焦，研究了炭化温度、粒径、微波功率和负压对煤焦放电的影响，利用FT-IR技术测定了微波放电对煤焦表面官能团的影响。结果表明:常压下，600 ℃以下炭化的煤焦经微波加热到200~300 ℃才会放电;800 ℃以上炭化的煤焦，炭化温度越高，整体放电越弱，终温越低;大粒径煤焦为间歇性弧光放电，小粒径煤焦为间歇性星点放电;煤焦粒径越小，放电时热点越多，煤焦终温越高;煤焦粒径小于98 μm时不放电;功率越高，煤焦整体放电越强;负压可促进煤焦放电，导致煤焦终温升高，达到临界负压，煤焦颗粒难以出现放电火花而温度急剧下降;放电可以促进煤焦芳环的开链和加速脂肪结构、含氧类官能团的转化脱除。

Characteristics of microwave discharge of Zhundong coke

By heating Zhundong coke with microwave,this paper studies the effects of particle size,power,coking temperature and negative pressure of coke on discharge.The influences of microwave discharge on the surface functional groups of coke are investigated by using FT-IR.The results show that the coke below 600 ℃ coking by heating to 200-300 ℃ can discharge.The coke above 800 ℃ coking,the higher the carbonization temperature,the less the overall discharge,and the lower the final temperature of coke.The large diameter coke makes intermittent arc discharge,and the small size coke makes intermittent spot discharge under normal pressure.The smaller the particle size,the more the heated hot spots in the discharge,and the higher the temperature of coke.No discharge appears when the coke diameter is less than 98 μm.The higher the power,the greater the overall discharge.The negative pressure can promote the discharge of coke,resulting in a higher final temperature.Achieving the critical negative pressure,the coke basically does not appear discharge so as to the temperature of coke drops sharply.The discharge can promote the chains of aromatic ring of coke opening and accelerate the transformation and removal of the fatty structure and the oxygen-containing functional groups of coke.