matlab数值积分算，假设储罐的密度和液氨的压力不变。模拟液氨储罐高架连续点源，在不同泄露速率、稳定度和风速下连续泄漏扩散的情况。当液氨储罐泄漏达到稳定状态时，扩散模型见下式：(During the leakage process, the pressure of the tank and the liquid ammonia density will change with the increase of the leakage amount. This change will be gradual and will affect each other.In order to simplify the calculation, it is assumed that the density of the tank and the pressure of liquid ammonia are unchanged.Simulation liquid ammonia storage tank high - frame continuous point source, in different leakage rate, stability and wind speed continuous leakage of the situation.When the leakage of liquid ammonia storage tank reaches a steady state, the diffusion model is shown in the following formula:)