以低温甲烷安全排放为目的,采用数值模拟方法对某试验台甲烷高空排放系统进行研究,分别采用AMESim软件及Fluent软件对排放管内的流动和管外的扩散情况进行了分析,安全排放准则为甲烷云团向上飘动或者水平扩散,研究工况包括了长期稳定排放及大流量短期排放。计算结果表明:排放流量越小越安全,长期稳定排放时甲烷的最大排放流量不能超过75g/s;试验台常规排放流量200 g/s最长的排放时间不得超过300 s,最长排放时间随着排放流量的增加而减小。 Aiming at the safety of low-temperature methane emission, a numerical simulation method was used to study the methane emission system of a test-bed. The AMESim software and Fluent software were used to analyze the flow in the discharge pipe and the diffusion outside the pipe respectively. The safety emission criterion was methane Clouds float upwards or spread horizontally. Research work covers long-term stable discharges and short-term discharges of large flows. The calculation results show that the smaller the discharge flow, the safer it is. The maximum discharge of methane can not exceed 75g / s when the long-term steady discharge is reached. The longest discharge time of the test bench with the normal discharge flow of 200 g / s should not exceed 300s. Decreased with increased emissions.