点击次数：

论文类型：期刊论文

发表时间：2013-07-01

发表刊物：JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES

收录刊物：SCIE、EI、Scopus

卷号：26

期号：4

页面范围：676-682

ISSN号：0950-4230

关键字：Dust explosion; Ducted venting; Relief pipe; Overpressure; Burn-up

摘要：A parametric experimental study of an aluminium dust explosion, initiated in a vessel and vented through a relief pipe, was performed. The aim is to clarify the overpressure characteristics in a vessel and relief pipe, during aluminium dust explosion venting, especially when a burn-up phenomenon occurs. For a vessel of fixed size, the influence of pipe diameter and pipe length on burn-up was discussed. Results demonstrate that burn-up occurs shortly after flame only enters the initial part of the relief pipe when the original dust concentration in the vessel is at relatively high level, which is usually higher than the optimum concentration obtained from the confined vessel. When burn-up occurs, the maximal overpressure continues to increase rather than to decay along the initial part of the relief pipe. If burn-up is vigorous, a second peak on overpressure-time curve in the vessel could appear. By adding 0.1 g aluminium powders on the membrane, the second overpressure peak may even surpass the first peak. Extending pipe lengths can strengthen the overpressures around the position where burn-up occurs in the relief pipe. Reducing the pipe diameter can increase the burn-up severity in the relief pipe owing to the increased dust concentration and the pressure accumulation. (C) 2013 Elsevier Ltd. All rights reserved.