煤焦油瓷漆加热搅拌釜的热力计算

煤焦油瓷漆加热搅拌釜是一种煤焦油瓷漆生产及现场涂层作业的加热装置，以往的煤焦油瓷漆加热方式以直接加热为主，其缺点是热效率低、污染严重，不能很好地适应生产要求。以热煤为载体的间接加热釜，也存在缺点，如搅拌效率低、物料混合不充分、耗能大、热媒与煤焦油瓷漆的总换热系数低、加热时间长等。为此，从煤焦油瓷漆和热媒的物理化学性质出发，利用热力学知识，计算了釜内热交换过程中的雷诺数Ｒｅ、普朗特数Ｐｒ和努谢尔特数

Thermodynamic Calculations for the Heating and Mixing Pot of Coal Tar Enamel

The heating and mixing pot of coal tar enamel is the heating device used for coal tar enamel production and field application. The conventional heating method.mostly of direct heating,is hard to fit in with application requirements due to its low heat efficiency and heavy pollution. Indirect heating pot,with heat medium as carrier,also suffers from some disadvantages, such as defficient and insufficient mixing,high energy consumption,low overall coefficient of heat exchange between heat medium and coal tar enamel,long heating time,etc. In this connection,thermodynamically calculated are the Reynolds number, Re.Prandtl number,Pr,and Nusselt number,Nu for the heat exchange in the pot,and the overall coefficient of heat exchange between heat medium and coal tar enamel is obtained. The newly calculated results can be used as design basis for mixing pot, so as to improve heating efficiency,reduce heating time and promote economic performance.