Arc plasma can be applied in hazardous solid waste disposal for higher temperature than common heating methods,but some practical issues exist in practical engineering application.In this study,an air arc plasma torch...Arc plasma can be applied in hazardous solid waste disposal for higher temperature than common heating methods,but some practical issues exist in practical engineering application.In this study,an air arc plasma torch with double chambers and magnetic controlling is designed to realize wide variable power and long electrode life.The detailed characteristics and laws of the air arc are studied.The condition parameters of arc current(I),air flow rate(G)and the structure parameters of inlet area ratios and electrode diameters influence both the arc voltage and arc root positions.The arc rotating driven by magnetic field effectively lengthens the electrode life.The gasification process and product of organic wastes by air plasma are influenced largely by the waste compositions and the air flow rate.A furnace structure with more even atmosphere and longer residence time should be considered for better gasification.Oxygen-deficient environment is important to suppress NOxformation during the application of air plasma.Inorganic solid wastes can be melt by the air plasma and cooled down to form compact vitreous structures in which heavy metals can be locked and the leaching rates significantly decrease down.展开更多
为了准确把握电弧放电电阻的大小,提高等离子体合成射流的能量利用率。进行了三电极尖尖放电的实验,通过改变电极间隙、环境气压、电容、电压,得到电弧电阻的大小以及放电效率、电弧电阻和放电形态随参数的变化。结果显示:大气压条件下...为了准确把握电弧放电电阻的大小,提高等离子体合成射流的能量利用率。进行了三电极尖尖放电的实验,通过改变电极间隙、环境气压、电容、电压,得到电弧电阻的大小以及放电效率、电弧电阻和放电形态随参数的变化。结果显示:大气压条件下,随着放电初始电压的增大,放电效率和电弧电阻逐渐降低;大气压条件下,对于同一电容能量(≥250 m J),电弧电阻不会随着电容值的变化而变化;高气压条件下(>50 k Pa),电容越大,电弧电阻和放电效率越高;增大电极间隙,可以增大电弧放电的电阻和放电效率。随着气压降低、电压增大或电极间隙增小,放电区域面积会增大。展开更多
基金supported by National Key R&D Program of China(No.2019YFC1907000)National Natural Science Foundation of China(No.11475131)。
文摘Arc plasma can be applied in hazardous solid waste disposal for higher temperature than common heating methods,but some practical issues exist in practical engineering application.In this study,an air arc plasma torch with double chambers and magnetic controlling is designed to realize wide variable power and long electrode life.The detailed characteristics and laws of the air arc are studied.The condition parameters of arc current(I),air flow rate(G)and the structure parameters of inlet area ratios and electrode diameters influence both the arc voltage and arc root positions.The arc rotating driven by magnetic field effectively lengthens the electrode life.The gasification process and product of organic wastes by air plasma are influenced largely by the waste compositions and the air flow rate.A furnace structure with more even atmosphere and longer residence time should be considered for better gasification.Oxygen-deficient environment is important to suppress NOxformation during the application of air plasma.Inorganic solid wastes can be melt by the air plasma and cooled down to form compact vitreous structures in which heavy metals can be locked and the leaching rates significantly decrease down.
文摘为了准确把握电弧放电电阻的大小,提高等离子体合成射流的能量利用率。进行了三电极尖尖放电的实验,通过改变电极间隙、环境气压、电容、电压,得到电弧电阻的大小以及放电效率、电弧电阻和放电形态随参数的变化。结果显示:大气压条件下,随着放电初始电压的增大,放电效率和电弧电阻逐渐降低;大气压条件下,对于同一电容能量(≥250 m J),电弧电阻不会随着电容值的变化而变化;高气压条件下(>50 k Pa),电容越大,电弧电阻和放电效率越高;增大电极间隙,可以增大电弧放电的电阻和放电效率。随着气压降低、电压增大或电极间隙增小,放电区域面积会增大。
