添加微波脱硫助剂对新峪焦煤介电特性的影响

Effects of adding microwave desulfurization aid on the dielectric properties of Xinyu coking coal

通过对新峪焦煤中添加助剂进行微波脱硫实验,探究了微波频率在2.45GHz下,酸性助剂(HCl)、碱性助剂(NaOH)、还原性助剂(HI)和氧化性助剂(HCOOH-H2O2)分别与新峪焦煤结合所得脱硫率,利用传输反射法测定煤样在0.1～6.5GHz频率范围微波脱硫前后的介电常数,表征介电特性发生的变化。研究结果表明:在0.1～6.5GHz频段范围内,伴随着盐酸溶液的浓度增加,煤样相对介电常数、相对介质损失因子和介质耗散因子相对应增加;煤样经氢氧化钠溶液处理后相对介电常数随着微波频率的增加而降低;氢碘酸溶液处理后的煤样相对介电常数曲线随频率的增加缓慢下降;甲酸-过氧化氢溶液处理后的煤样相对介电常数曲线趋于稳定,不再随频率的增加缓慢下降,在6.0GHz后曲线开始上扬。

The microwave desulfurization experiment is carried out by adding additives to Xinyu coking coal.In the microwave frequency at 2.45 GHz,acidic auxiliary(HCI),alkaline auxiliary(NaOH),reducing auxiliary(HI)and oxidizing auxiliary(HCOOH-H 2O 2)are obtained desulfurization rate combined with the Xinyu coking coal,and the transmission and reflection method is used to measure the dielectric constants of coal samples before and after microwave desulfurization in the frequency range of 0.1-6.5 GHz to characterize the changes in the dielectric properties.The results show that the relative permittivity,relative medium loss factor and medium dissipation factor of the coal sample increase with the increase of the concentration of hydrochloric acid solution in the range of 0.1-6.5 GHz;the relative permittivity of the coal sample after sodium hydroxide solution treatment decreases with the increase of microwave frequency;the relative permittivity curve of the coal sample treated with the hydroiodic acid solution slowly decreases with the frequency increase;after the formic acid-hydrogen peroxide solution treatment,the relative permittivity curve of the coal sample tends to be stable and does not gradually decrease with the increase of the frequency,and the curve starts to rise after 6.0 GHz.