煤焦部分气化、燃烧集成热重分析研究

在热天平上进行了煤焦部分气化、燃烧的实验研究。所得到的三种不同煤焦 (神木、彬县、西山 )在不同温度 ,不同气化碳转化率下的部分气化 ,燃烧失重曲线表明 :煤种、气化碳转化率对燃烧失重均有影响。气化碳转化率越高 ,所得到的焦燃烧速率越小。同时从实验中得到 :正确选择气化碳转化率在进行部分气化、燃烧集成优化中是非常重要的。     

原煤和黑液水煤浆燃烧特性的热分析对比研究

在热天平上进行黑液水煤浆和原煤的燃烧、热解实验,得到不同升温速率下的燃烧、热解特性曲线和碳转化率特征曲线。试验结果表明,黑液水煤浆中的钠及其化合物在燃烧过程中催化作用明显,并且黑液中有机物成分对燃烧起到一定促进作用。在20 ℃/min升温速率下黑液水煤浆和原煤的燃烧活化能分别为12.98 kJ/mol和106.59 kJ/mol,反映出黑液水煤浆比原煤有更好的着火特性。     

Temperature calibration of thermo-balances with nickel-iron-nickel-bimetal

The behaviour of Ni?Fe?Ni sandwich material was investigated in air atmosphere up to 850°C with the NETZSCH microbalance TG 209. The aim was to determine if this substance is suitable for calibration. The results show that nickel-iron-nickel-bimetal makes it possible to calibrate thermobalances whilst expending a minimum of time and effort.     

Gasanalyse beim Sintern von Hartmetall durch TA-imulation

The processes taking place during outgassing and sintering of different hard metals are investigated by Simultaneous Thermal Analysis (Thermogravimetry and Differential Thermoanalysis) coupled with Mass Spectrometry. In this paper an overview on the application of these methods is given. The progress of gas reactions, their kinetics and the reaction products themselves are characterized more in detail. Main products of the outgassing during the sintering of hard metals are hydrocarbons, carbon monoxide, carbon dioxide and partly nitrogen. The outgassing during the sintering of conventional WC-Co hard metal is finished at relatively low temperatures (approximately 800C). The outgassing during the sintering of cermets and of hard metals containing mixed carbides takes place up to higher temperatures (partly up to the formation of the liquid phase). Critical temperature ranges of technological processes may be determinated.