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为开发生物质焦炭电磁屏蔽材料,研究了各种因素对稻壳焦炭导电特性的影响规律.利用自制的高温炭化试验装置,考察了炭化终温、升温速率、终温下的保留时间、粒径大小、催化剂种类及配比等因素对焦炭电阻率的影响规律.研究结果表明:炭化终温对稻壳焦炭电阻率影响较大,特别是在1000℃以下,提高炭化终温可将焦炭电阻率从106Ω.cm以上降低到2Ω.cm左右;而当炭化终温从1000℃提高到1400℃时,电阻率仅从2Ω.cm左右降低到1.5Ω.cm左右.提高升温速率会降低焦炭产率,但对电阻率的影响不大.延长炭化终温时间对降低电阻率有一定作用,但当物料粒径较小时其作用几乎可以忽略.Fe2O3和NiO可作为炭化催化剂降低焦炭电阻率,两者催化效果相当,稻壳与催化剂的最佳质量配比在50∶1左右.当炭化终温>1000℃、升温速率为20℃.min-1、保留时间为30min、稻壳粒径为0.1～0.3mm、稻壳∶催化剂=50∶1时,所获焦炭电阻率为0.2～1.0Ω.cm.
In order to develop biomass coke electromagnetic shielding materials, the influence of various factors on the conductive properties of rice husk coke was studied.The self-made high-temperature charring test equipment was used to study the carbonization temperature, the heating rate, the retention time at final temperature, Size, type of catalyst and the ratio of coke on the resistivity of the coke.The results show that: the carbonization of the final temperature of rice husk coke resistivity greater impact, especially below 1000 ℃, carbonization can increase the final temperature of the coke resistivity From 106Ω.cm above to about 2Ω.cm; and when the carbonization temperature increased from 1000 ℃ to 1400 ℃, the resistivity decreased from only about 2Ω.cm to about 1.5Ω.cm Increase the heating rate will reduce the coke yield , But little effect on the resistivity.Extended carbonization of the final temperature time to reduce the resistivity has a certain effect, but when the material size is small, its role is almost negligible.Fe2O3 and NiO can be used as a carbonization catalyst to reduce the coke resistivity, both The results showed that the best mass ratio of rice hull and catalyst was about 50:1, when the final carbonization temperature was> 1000 ℃, the heating rate was 20 ℃. Min-1, the retention time was 30min, 0.3mm, rice husk : Catalyst = 50: 1, the obtained coke resistivity is 0.2 to 1.0 Ω · cm.