Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:Huagong Xuebao/CIESC Journal

Volume:72

Issue:5

Page Number:2887-2895

ISSN No.:0438-1157

Abstract:Explosion venting and explosion suppression are two important means to reduce the hazard of dust explosion in industry. Therefore, the coupling of the two methods to reduce the hazard of dust explosion is worth to attention. The influence of CO2/N2 on the pressure release process of lycopodium powder was experimentally studied with different discharge diameters and static activation overpressure by employing standard 20 L spherical dust explosion device with a lateral venting device. The thermogravimetric analysis method was used to analyze the thermogravimetric changes of lycopodium dust in the atmosphere of CO2 and N2 respectively. The results show that at 20 mm discharge caliber, with the increase of CO2/N2 concentration, the reduction amplitude of discharge pressure gradually increases, and the reduction effect of CO2 on the maximum overpressure of dust explosion discharge is better than that of N2. The reduced pressure basic linearly with the increase of CO2 concentration decreased. The reduced pressure began to be consistent when adding 10% concentration of CO2 or N2. For the 40 mm venting diameter, the value of reduced pressure when added CO2 is slightly lower than that of N2, from 6% to 8%. For the 60 mm venting diameter, with the increase of CO2/N2 concentration, the reduction of the reduced pressures are basically the same, and when the added concentration is no more than 8%, it has little influence on the amplitude reduction of the system reduced pressure. According to the TGA curve, in the heat flow conditions of N2 atmosphere and CO2 atmosphere, the pyrolysis process of lycopodium began to show significant differences around 370℃. The pyrolysis rate of lycopodium in CO2 atmosphere was faster than that in the N2 atmosphere, so the presence of CO2 in this process promoted the pyrolysis of lycopodium. With the further increase of pyrolysis temperature, the inhibition effect of CO2 on the pyrolysis of lycopodium powder began to show gradually. © 2021, Editorial Board of CIESC Journal. All right reserved.

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