NiO/Al体系绝热温度的数值计算与试验验证

Adiabatic temperature calculation and verification of NiO/Al aluminothermic system by computer simulation

根据热力学基本原理,通过计算机编程,对NiO/Al体系的绝热温度进行了数值计算。结果表明,预热温度低于2790 K时,体系绝热温度即为产物Ni的沸点温度(3156 K),对体系进行预热仅仅是提高产物Ni的蒸发量;同时,研究表明,稀释剂Al2O3粉末的添加量在一定的范围内对体系的绝热温度没有影响,这些温度与生成物的相变温度相对应。

Based on the thermodynamic theory,the adiabatic temperature of NiO/Al aluminothermic system was calculated by computer numeral simulations.The results show that the adiabatic temperature is equal to the boiling point of Ni element（3156 K） when the preheat temperature is below 2790 K.That is to say,to preheat reactants only increases the gasification rate of Ni element.The results also indicate that the just concentration of Al2O3 diluting agent has little effect on the adiabatic temperature of NiO/Al aluminothermic system,which corresponds to phase transformation temperatures of productions.