Enhancement and performance evaluation for heat transfer of air cooling zone for reduction system of sponge titanium
Enhancement and performance evaluation for heat transfer of air cooling zone for reduction system of sponge titanium
复制标题
海绵钛还原系统空冷区传热强化及性能评价
DOI：
10.1007/s00231-016-1836-z
复制
发表时间：
2017
影响因子：
2.2
通讯作者：
Jin Huixin
中科院分区：
文献类型：
--
作者：
Wang Wenhao;Wu Fuzhong;Jin Huixin
由于目前的镁热还原法是一种放热性很强的还原反应，为了保持还原反应器的温度，TiCl4的加料速度很慢，生产效率和能量利用率都很低。为了缩短生产周期，提高能源利用率，提出了一种强化还原系统空冷区传热的强化方案。首先介绍了空冷区及强化方案。在此基础上，通过理论分析和实验数据得到了无强化方案时冷却区的换热特性。最后对增强效果进行了分析和评价。结果表明，换热系数的拟合结果可以用来评价冷却区的强化换热效果。热源温度下降有限，强化冷却后传热速率明显提高，TiCl4进料速率可显著提高9.61%。实测和计算结果均满足设计要求。
Since the magnesiothermic reduction employed in current sponge titanium is a highly exothermic reaction, the TiCl4feed rate is carried out slowly to keep a suitable temperature in reduction reactor, which accounts for an extremely low level of productivity and energy efficiency. In order to shorten the production cycle and improve the energy efficiency, an enhancing scheme is proposed to enhance the heat transfer of air cooling zone for reduction system. The air cooling zone and enhancing scheme are firstly introduced. And then, the heat transfer characteristics of cooling zone are obtained by theoretical analysis and experimental date without enhancing scheme. Finally, the enhancement is analyzed and evaluated. The results show that the fitting results of heat transfer coefficients can be used to evaluate the heat transfer enhancement of cooling zone. Heat sources temperatures have a limited decreasing, heat transfer rate increases obviously with the enhanced cooling, and the TiCl4feed rate can be increased significantly by 9.61 %. And the measured and calculated results are good enough to meet the design requirements.