水泥厂热风管道的优化设计(一)

Optimize design of hot air duct of cement plant

以2500t/d新型干法窑生产线为例,进行了热风管道的优化设计的三方面研究:(1)介绍了窑尾风管的四种优化方案,每种方案均可有效缩短管道高度5m左右,从而可降低建设钢材用量约10t左右,且能减小运行阻力、节约电耗。(2)进行了用钢板焊成的风管弯头的柔性研究,计算了弯头的柔性系数和应力增大系数。结果表明,完成与直管相同的变形,钢板焊成的风管弯头所产生的力远远小于直管;但弯头处应力则远大于直管。(3)对一级筒至增湿塔风管及窑尾烟囱在预热器塔架上的导向支座方案进行了研究探讨。研究表明,悬挑梁支承方案用钢量较高;而用简单的拉压杆支承体系,在保证热风管道和烟囱在风载荷或地震作用下水平方向稳定时,可实现纵向自由伸缩,并可有效节约建设投资。

Take the 2500 t/d NSP production line for example, the authors have researched on optimizing design of hot air duct fromthree different ways. （1） Introduced four optimizing schemes of air duct at kiln back end, and for each scheme, it can decrease the hight ofthe duct by 5 meters and the steel quantity by 10 tons and can reduce running resistance, save power consumption. （2） studied on flexibility of duct elbow welded by steel plate, calculated the flexibility coefficient and added-stress coefficient. The results show that for thesame distortion, the strength needed by air duct elbow welded by steel plate is less than that of the direct duct, but the stress in the elbowis far more than that in the direct duct. （3） discussed on setting scheme of air duct from C1 cyclone to humidifier and deflector seat ofback-end chimney on preheater tower. And the results show that with supporting system of simple tensile compressive pole, horizontalstability of hot air duct and chimney under air load and earthquake guaranteed, can realize free flex, and can save effectively construction cost.