Fire And Explosion Risk Analysis In High Density Polyethylene Production Process And Oxidation Kinetics Of High Density Polyethylene

Polyethylene is widely used in various fields of production and life because of its good physical and chemical properties.With the increasing demand of the market,the scale is expanding,but at the same time,it also brings many safety problems.The frequent fire and explosion accidents of polyethylene at home and abroad have resulted in tragic casualties,huge economic losses and great negative impact on society.Therefore,the risk analysis of polyethylene production process,the timely elimination of safety hazards,and the study of the mechanism of fire and explosion of polyethylene from the macro and micro perspectives can provide scientific basis for the production of polyethylene in the process conditions and preventive measures.In this paper,the risk of fire and explosion accident in HDPE production process was analyzed by using fault tree based on triangle fuzzy number,the influence of different heating rate and particle size on the oxidation of HDPE powder was studied by using synchronous thermal analyzer,and the kinetic parameters of oxidation and the characteristics of heat absorption and heat release in the oxidation process were analyzed by using TG-DSC curve,The average activation energy of HDPE was calculated by the equal conversion method FWO and Starink method in thermal analysis and verified by each other.The mechanism function of oxidation process was determined by the two-step double equal method and Coats Redfern method.Finally,the infrared spectrum of HDPE in the original state and oxidation to different characteristic temperature points was measured by Fourier infrared spectrometer,and the change rule of functional groups of HDPE in the oxidation process was analyzed.The results show that: in the production of HDPE,the probability of open fire and electrostatic spark have a great influence on the system,so corresponding measures should be taken to prevent accidents;in the thermal analysis experiment,with the increase of heating rate,the TG and DTG curves of HDPE move to the high temperature side,and the particle size has a certain influence on the activation energy value.The activation energy value calculated by integral method is higher than the activation energy value calculated by differential method,and the mechanism function of HDPE oxidation process conforms to the model of n=3;the heat absorption and heat release behavior of HDPE in the oxidation process is related to the micro functional groups,and the fatty hydrocarbon functional groups tend to decline in the oxidation process,which has a great impact on HDPE in the oxidationprocess,because it is easy for fatty hydrocarbon functional groups to react with the oxygen in the air and thus be consumed,resulting in the oxidation and combustion of HDPE.