Experimental Study On Sucrose Dust Explosion Experiment And Distribution Numerical Simulation

Dust explosion accident is one of the key issues in the field of safety production.Through the analysis of a large number of dust explosion accident cases,the number of dust explosion accidents caused by grain dust is the largest.Sucrose is a very common substance in industrial production and life.Among them,sugar production in Guangxi accounts for the largest proportion of sugar production in the country.Studying the characteristics of sucrose dust explosion is of great significance to help Guangxi sugar enterprises the being more safety.The main research contents of this paper are:firstly,observe the surface morphological characteristics of sucrose dust collected at the production site of sugar production enterprises by scanning electron microscope,calculate the mass dispersion of sucrose dust;then use the 20L spherical explosion container to test the lower explosion limit of 200?300 mesh sucrose dust.Finally,using the ANSYS FLUENT software to simulate the velocity distribution of sucrose dust in a 20L spherical explosion vessel.The results of the whole process are as follows:(1)The sucrose particles are irregular crystal structures,but the structural shape is not changed abruptly.The surface of the sucrose dust granules has a certain adsorption effect,and can adsorb sucrose with smaller granules,but the large granules of sucrose dust are substantially independent of each other,which makes the syrup powder more easily diffused in the air.The largest proportion of sucrose dust accumulated in the production site of sugar production enterprises is of more than 200 mesh,and there are also a very small number of powders of 400 to 500 mesh.This part of the dust of very small particle size is more sensitive to ignition energy.(2)Experimental study on the effect of pressure and ignition delay time on the lower explosion limit of sucrose dust,it can be seen that the lower explosion limit of sucrose dust increases with the increase of ignition delay time,and decreased as the pressure increases.When the ignition delay time is 60ms,the lower explosion limit of the sucrose dust decreases with the increase of the powder pressure most significantly.(3)The test also found that the lower explosion limit of the dust changes under the combined action of the pressure and the ignition delay time.The lower explosion limit of the sucrose dust cannot be defined separately,and the test conditions should be clarified.The lower explosion limit of sucrose dust obtained by the test is 85?90 g/m3.At this time,the pressure is 2 MPa,the ignition delay time is 30 ms,and the maximum explosion pressure occurring in the test is 0.320 MPa.The effect of the particle size of the sucrose dust on the lower explosion limit was studied.The lower explosion limit of sucrose dust decreased under the test conditions as the particle size of the dust decreased.(4)The sucrose dust explosion process can be summarized into five stages,and the kinematics description is based on the aerodynamic mechanics using equations.The combustion and explosion of aerosol system composed of sucrose dust particles-air is a complex process in which gas-solid two-phase interaction affects the velocity distribution of sucrose dust after spraying from a nozzle in a 20L spherical explosion vessel based on the conservation law using ANSYS FLUENT software.The results obtained by the simulation are basically consistent with the results obtained in the actual test.