Abstract: Abstract: According to the ventilation safety theory and the CFD method based on the component transport model, the ventilation safety characteristics and appropriate performance evaluation indices of the circular coal dome are discussed. Taking the circular coal dome with a diameter of 100 m as an example, the effects of the opening mode, position and geometric size of the circular vent on the distribution, transport characteristics and removal efficiency of coal dust and gas are studied, and the optimal vent design parameters are obtained. The research results show that in the case of single annular opening, the vent is changed from horizontal to lateral, which can improve the internal environment and improve the removal efficiency of pulverized coal dust and harmful gas. The recommended height of the lateral annular vent is 2 m. Adding an annular opening in the middle of the dome can effectively reduce the concentration of suspended pollutants at the height of 30-35 m above the coal dome. The optimal positions of the double ring openings are 15 and 31 m respectively, which can make the dust mass concentration in most areas of the coal dome lower than 10 mg/m3; The mass concentration of CO2 gas is lower than 30 mg/m3; The highest sewage discharge efficiency is nearly 80%. The research results can provide reference for ventilation safety design of super large space circular coal dome.

Key words: Key words: large space circular coal storage dome, ventilation safety, CFD method, opening, optimal design