磁场增强DBD等离子体改善煤炭燃烧的特性

Improving Coal Combustion Characteristics by Magnetic Field Enhanced DBD Plasma

我国能源结构决定了煤炭是我国能源安全的“压舱石”,为研究煤炭资源高效利用,论文搭建了板–板电极结构的等离子体辅助煤炭燃烧装置,利用永磁体产生平行于电场方向的磁场,研究了平行磁场对等离子体辅助煤炭燃烧过程中放电功率、质量衰减、温度变化的影响。研究结果表明:磁场介入能有效增强放电脉冲电流的数量和幅值,提高燃烧装置介质阻挡放电的放电功率。磁场通过增强放电电流和放电功率提高了煤炭燃烧过程中温度与质量衰减速度,加快了煤炭燃烧进程。当峰–峰值电压从16 kV增加到20 kV时,磁场对等离子体辅助煤炭燃烧温度提升与质量衰减速度促进效果逐渐增大;当峰–峰值电压达到22 kV时,等离子体辅助煤炭燃烧达到最佳匹配,磁场增强作用存在饱和现象。煤炭燃烧形貌表明磁场介入能在一定程度上促进等离子体辅助煤炭燃烧。

China’s energy structure determines that coal is the“ballast”of China’s energy security.To research the efficient utilization of coal resources,this paper constructed a plate-to-plate electrode structure for plasma assisted coal combustion,where a magnetic field parallel to the direction of the electric field with a permanent magnet is generated,and studied the effect of the parallel magnetic field on the discharge power,mass attenuation and temperature change during the plasma assisted coal combustion process.The research results show that the intervention of the magnetic field can effectively enhance the number and amplitude of discharge pulse current and improve the DBD discharge power of combustion device.The magnetic field enhances the temperature and mass attenuation rate during coal combustion and accelerates the coal combustion process by increasing the discharge current and discharge power.When the peak-peak voltage increases from 16 kV to 20 kV,the promotion effect of the magnetic field on the temperature rising and mass attenuation rate of plasma assisted coal combustion gradually increases.When the peak-peak voltage reaches 22 kV,the plasma assisted coal combustion reaches the best match and the magnetic field enhancement effect reaches a saturation phenomenon.The morphology of coal combustion demonstrates that the intervention of the magnetic field can promote the plasma assisted coal combustion to a certain extent.