关键词: 关键词：放空立管、冷放空、热放空、防火间距、风速

Abstract: Abstract: in view of the GB50183 gave no vent quantity more than 4×104 m3 / h when fire separation, adopting det norske veritas DNV PHAST software for different vent quantity under the condition of different wind speed and gas diffusion and to simulate the thermal radiation scope, determined the cold blow-down operation, between the riser and the oil and gas station fire prevention spacing should be not less than 0.5 LFL limit boundary space; In heat venting operation, the fire prevention interval shall not be less than 4.75kW/m2, the boundary space limited under the condition of permissible heat radiation. The results show that when the discharge volume is 20×104m3/h and the wind speed is 20m/s, the fire spacing of cold discharge and hot discharge is 29.4m and 67.2m respectively, which are all less than the fire spacing between riser and station specified in GB50183. The research results can provide technical reference for the compilation and update of GB50183 and theoretical basis for the layout and general drawing design of oil and gas station.