采用热重红外联用仪研究了印染污泥与烟煤的掺混燃烧过程.结果表明：污泥燃烧存在3个主要阶段,分别对应于150-350℃区间纤维类挥发分的析出和燃烧、350-500℃区间细菌蛋白质等高分子有机质的燃烧以及500℃后无机染料矿物质的煅烧;烟煤...采用热重红外联用仪研究了印染污泥与烟煤的掺混燃烧过程.结果表明：污泥燃烧存在3个主要阶段,分别对应于150-350℃区间纤维类挥发分的析出和燃烧、350-500℃区间细菌蛋白质等高分子有机质的燃烧以及500℃后无机染料矿物质的煅烧;烟煤中掺入印染污泥可提高着火特性,30%掺混时可降低着火点约20℃,同时综合燃烧特性指数下降;印染污泥燃烧初期活化能仅为70 k J/mol,燃烧后期活化能升至130-160 k J/mol;随烟煤中污泥添加量的增加,混合物初始阶段的活化能减小而后续燃烧阶段的活化能增大.综合分析发现,当污泥量低于20%时,对整体燃烧特性的影响较小.热重红外曲线表明：污泥与烟煤混合后,矿物质之间通过反应对污染物的行程产生影响;污泥灰分中的碱性氧化物以及起固硫催化作用的Fe2O3有利于将混合物中的硫固定在灰渣中;NOx主要来源于燃料型NOx的释放;由于污泥易于脱挥,析出小分子的可燃气体形成还原性气氛,有利于降低混合物燃烧前期NOx的生成.展开更多
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
文摘采用热重红外联用仪研究了印染污泥与烟煤的掺混燃烧过程.结果表明：污泥燃烧存在3个主要阶段,分别对应于150-350℃区间纤维类挥发分的析出和燃烧、350-500℃区间细菌蛋白质等高分子有机质的燃烧以及500℃后无机染料矿物质的煅烧;烟煤中掺入印染污泥可提高着火特性,30%掺混时可降低着火点约20℃,同时综合燃烧特性指数下降;印染污泥燃烧初期活化能仅为70 k J/mol,燃烧后期活化能升至130-160 k J/mol;随烟煤中污泥添加量的增加,混合物初始阶段的活化能减小而后续燃烧阶段的活化能增大.综合分析发现,当污泥量低于20%时,对整体燃烧特性的影响较小.热重红外曲线表明：污泥与烟煤混合后,矿物质之间通过反应对污染物的行程产生影响;污泥灰分中的碱性氧化物以及起固硫催化作用的Fe2O3有利于将混合物中的硫固定在灰渣中;NOx主要来源于燃料型NOx的释放;由于污泥易于脱挥,析出小分子的可燃气体形成还原性气氛,有利于降低混合物燃烧前期NOx的生成.
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.
