式提升机的泄爆排气.docx

斗式提升机的泄爆排气
摘要
This paper is a report of an experimental programme on the explosion protection of bucket elevators by venting. The project was a collaborative effort with funding by the Health and Safety Executive and manufacturers and users of bucket elevators through the British Materials Handling Board. Two bucket elevators were used in the project—a single leg elevator and a twin-leg elevator. Four dusts were used with KSt values up to 211 bar m s−1 and dust clouds were produced by dust injection and by normal operation. Reduced explosion pressures were measured and guidance has been derived from the results. This guidance is in terms of vent spacing as a function of the KSt value of the dust.
本文介绍附在斗式提升机上的防爆装置的泄爆实验。该项目是由卫生安全部门以及制造商和用户委托英国材料处理部门执行。两斗式提升机中使用了一个单腿电梯和一双腿电梯。测量了爆炸压力和已经衍生出的结果。本指南是根据排气间距为尘埃中的值函数。
Keywords
关键词:粉尘爆炸;发泄;斗式提升机
Bucket elevators are widely used in the handling of large quantities of bulk powders and are normally the preferred means of conveying where long vertical lifts are required for free flowing powders/granular products. As such they are to be found in nearly all animal feed mills, bulk grain stores and many of the larger installations handling powders in the food industry. Powder or granular products inevitably spill from the buckets during operation and fall down the upleg of the elevator. The finer material is likely to remain in suspension while the coarser material falls back to the boot. At the top of the elevator most of the powder will discharge down the off-take chute, but some will normally be carried over into the downleg of the elevator. Thus both legs are likely to contain a dust cloud of unknown concentration, constantly agitated by the moving buckets, all the time the elevator is in operation. Various sources of ignition are foreseeable in such units and explosion incidents have been reported.
斗式提升机广泛应用于处理大批量散装粉末,是自由流动的粉末或颗粒长距离垂直输送优先选择。正是因为这样他们可以在几乎所有的动物饲料以及散装谷物的商店和许多大型设备在食品工业中用于处理粉末。粉末或颗粒状产品在操作中不可避免地溢出。较细的物料可能会保