摘要
介绍了单仓泵密相气力输送系统的工艺流程、单仓泵间歇输送的工作原理以及对应的仓泵内压力变化。仓泵工作过程分为进料、流化、输送及吹扫4个阶段,密相气力输送管内流动复杂且不稳定,流型多变,实际运行过程中常出现管道堵塞、部件磨损、下料不畅、出力不足等问题。从系统压力损失计算、固气比选定、仓泵压力上下限值设定、系统选型与布置、压缩气源品质、物料品质、间歇操作、气动阀漏气、料位计故障及压力变送器故障等方面分析了问题产生的原因及影响因素。
The process flow of the dense phase pneumatic conveying system of single bin pump was introduced,combined with its working principle including the four processes of feeding, fluidization, conveying and blowing, and the corresponding pressure change in the bin pump. The flow in dense phase pneumatic conveying pipe is complex and unstable with varying flow pattern. During the actual system running, the problems of pipe clogging,components wearing, unsmooth feeding and insufficient performance occurs frequently. Aiming at these problems, its cause and effect factor were comprehensively analyzed from the aspects of conveying system pressure drop, solid-gas ratio, bin pump maximum and minimum pressure setting, conveying system selection and layout, the quality of compressed air, the product characteristic, batch operation, pneumatic valve leakage and level sensor fault.
引文
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