Simulation of Coal Dust Deposits Self-Ignition in Oxy-Fuel Atmospheres
Self-ignition of coal dust deposits poses a higher risk of fires in oxygen-enriched oxy-fuel combustion systems.In this work, we develop a numerical method, using the commercial software COMSOL Multiphysics, to investigate self-ignition behaviour of coal dust accumulations with a main emphasis on the roles of oxygen, diluent gas and dust volume.A modified one-step global kinetic model considering both the mole fraction of oxygen and gas products is used to estimate reaction rate using the kinetic parameters from previously conducted hot-oven tests.This model is validated to predict the transient temperature and concentration profiles of South African coal dusts until ignition.The computed self-ignition temperatures of dust volumes show a good agreement with experimental results.In addition, it is found that the inhibiting effect of carbon dioxide is comparatively small and oxygen consumption increases dramatically after ignition.Parameter analysis shows that the heating value has a comparatively pronounced effect on self-ignition temperature.The model provides a satisfactory explanation for the dependence of self-ignition behaviour on gas atmospheres, thus helping to further understand the fire risk of self-ignition in oxy fuel combustion systems.
ignition temperature coal dust O2/CO2 ambient hot oven hot plate numerical simulation
Dejian WU Maarten VANIERSCHOT Filip VERPLAETSEN Jan BERGHMANS
Department of Mechanical Engineering, KU Leuven, Celestijnenlaan 300A, B3001 Leuven, Belgium Adinex NV, Brouwerijstraat 5/3, B 2200 Noorderwijk, Belgium
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
503-517
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）