双系列高固气比预热系统热力学理论计算与分析

利用悬浮预热系统中质量和热量平衡的关系,从理论上推算出双系列高固气比五级悬浮预热系统热效率表达式,并利用Matlab编程计算,分析了固气比、各级预热器单体分离效率和预热器级数对悬浮预热系统热效率的影响,得到了优化的设计参数。结果表明:随固气比的增大,系统热效率出现峰值;热效率随各级旋风筒分离效率的增大而增大,C1分离效率对热效率的影响最明显;系统级数越多,越有利于提高热效率,但随级数的增多,提高幅度越来越小。

Thermodynamic calculation and analysis of double-series high solid-gas ratio preheater

The thermal efficiency expression of double-series high solid-gas ratio five stages suspension preheating system on the basis of mass and heat balance was calculated. The optimal design data could be obtained by using the Matlab program to analyze the effect of solid-gas ratio, separation efficiency of each stage and numbers of preheater stages etc on thermal efficiency of the suspension preheating system. The results showed that the thermal efficiency appeared a peak value with the increasing of the solid-gas ratio, The thermal efficiency increased with the rising of separation efficiency of each stage cyclone, and the separation efficiency of the first stage cyclone was the most important factor. It might be benefit for the thermal efficiency by adding the number of stages, but the amplitude would be reduced with the number of stages increased.