蓄热体余热回收换热器强化传热实验研究

Heat Transfer Enhancement of Heat Exchanger for Regenerator Waste Heat Recovery

利用蓄热式热热交换理论和高温空气燃烧技术的原理,在热态实验基础上建立了蜂窝陶瓷蓄热体的性能研究实验.结果表明,热效率及温度效率随换向时间的增加均呈现先上升后下降的趋势,存在一个最佳换向时间,即热效率和温度效率随着长度的增加而增大,但阻力损失也随之增大;同时存在一个最佳气体流速使蓄热体效率与经济效益达到最佳值;蓄热体的平均温度与气体出口温度均随着换向周期数的增加而升高;对于给定几何外形尺寸的蓄热体,四边形孔格结构的蓄热体具有较大的比表面积,流动性更好,具有更高的温度效率和热效率.

Using the regenerative heat exchange theory and the principle of HTAC technology, the experiment on the performance of honeycomb ceramic regenerator is conducted on the basis of thermal experiments. The results show that with the increase of reversing time, both thermal efficiency and temperature efficiency rise first and then fall, and there exists an optimal reversing time, which increases with the increase of length , but resistance loss also increases;there exists an optimal gas flow rate at the same time, which leads to the best regenerator efficiency and economic benefits;the average temperature of regenerator and gas outlet temperature increase with the increase of reversing cycle number;for the regenerator with a given geometric shape and size, the one with the quadrilateral cell structure has a larger surface area, with better liquidity and higher temperature efficiency and thermal efficiency.