Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:化工学报

Affiliation of Author(s):化工学院

Volume:70

Issue:3

Page Number:1227-1235

ISSN No.:0438-1157

Abstract:An experimental apparatus which could withstand high pressure and with good visibility was modified.PIV technology was applied to measure the distribution of cold pulverized flow field. Flame propagation characteristics of polyethylene dust explosion were investigated in closed vessel. In experiments, flame structure, flame brightness, flame front location, flame propagation speed and other parameters variation were analyzed. The results show that in the concentration range of 200-1000 g/m3, the low-concentration polyethylene dust explosion flame has a discontinuous fin-like structure, and the flame front is discrete star-shaped. On further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 400 g/m3. The velocity fluctuated obviously during the flame propagation process of polyethylene dust explosion at different concentrations, which increased at first and then decreased. The velocity-fluctuation of the flame was more obvious when it was close to the optimum explosion concentration range. The RMS turbulent velocity equation was adopted to quantify overall pulsation amplitude. Dust concentration was close to the optimal explosion concentration of 400 g/m3 and the RMS turbulent velocity was 3.21 m/s.

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