16对设计方法的快速检查..docVIP

16 Quick Check Design Methods对设计方法快速检查1 INTRODUCTION 前言 The design of pneumatic conveying systems is usually carried out on the basis of scaling data obtained from the pneumatic conveying of the material to be transported. If previous experience of conveying a given material is not available, data is generally derived for the purpose by conveying the material through a test facility, as discussed in detail in the previous chapter. Most manufacturers of pneumatic conveying systems have such test facilities for this purpose.气力输送系统的设计通常是在从这种物料的气力输送过程中获取的缩放数据的基础上进行的。如果输送某种物料时没有以往经验可以利用，通常要在试验装置中输送这种物料以得到所需的数据，在前面的章节中对此做了详细讨论。大多数气力输送系统的制造商都有此等试验设施。 If it is required to make a quick check on the potential of an existing system, or to provide a check on design proposals, there is little information readily available for the engineer to use. Pneumatic conveying does not lend itself to simple mathematical analysis, and it is likely that many engineers would not be able to undertake such a task easily, particularly if it were a low velocity dense phase system. 如果需要对现有系统的潜力做快速检查，或提供有关设计方案的检查，没有什么现成的资料可供工程师使用。气力输送并不是容易的数学分析，很可能许多工程师将无法胜任这样的工作，尤其对一个低速密相系统。 Since pneumatic conveying systems tend to have high power ratings, particularly for conveying in dilute phase suspension flow, it is useful to be able to obtain a rough estimate of air requirements at the feasibility stage of a project. Most of the operating cost of a pneumatic conveying system is in the drive for the air mover. If an estimate can be made of the system air requirements, it is a simple matter to evaluate the operating cost in Cents per ton conveyed to see if it is at an acceptable level before proceeding further. 由于气力输送系统通常能耗高，特别是稀相悬浮流输送，在一个项目的可行性研究阶段能够获得空气需求的大略值是非常有用的。一个气力输送系统的大多数运行费用都是花费在空气动力机械的驱动上。如果能估计出系统的空气要求，那么算每吨输送的运行费用就简单了，这样可以在进行下一步前看看它是否可以接受。 1.1 Methods Presented目前的方法 A number of straightforward methods are presented that will allow a check to be made on the design of a pneumatic conveying system in