基于CFD模拟的带压火焰射流辐射热阻断效果评估

Evaluation on heat blocking effect of jet radiation by pressurized flame based on CFD simulation

为评估防火墙作为安全屏障对带压火焰射流辐射热的阻断效果,结合CFD模拟和个人风险计算建立热阻断效果定量评估方法。以某化工企业乙烯反应塔泄漏产生的带压火焰为研究对象,利用FLACS软件模拟得到对于储罐表面受到热辐射影响相对最大的位置处(观测点1)原始场景和增加防火墙后,带压火焰作用于邻近储罐的热辐射强度,并计算多米诺效应概率和个人风险值。研究结果表明:原始场景下该位置热辐射强度为310.69 kW/m^(2),事故会扩展到邻近储罐,并产生多米诺效应,多米诺效应概率为7.14×10^(-6);增加防火墙后该位置热辐射强度降低为24.69 kW/m^(2),约为原始场景热辐射的1/13,此时无多米诺效应产生;原始场景下个人风险值为2.11×10^(-9),增加防火墙后为6.33×10^(-13),减小4个数量级,表明防火墙对带压火焰射流辐射的热阻断效果显著。研究结果可为化工企业安全策略构建提供一定理论参考。

In order to evaluate the heat blocking effect of firewall as a safety barrier on the jet radiant of pressurized flame,a quantitative evaluation method of heat blocking effect was established by combining CFD simulation and individual risk calculation.Taking the pressurized flame generated by the leakage of ethylene reaction tower in a chemical enterprise as the research object,the thermal radiation intensity of pressurized flame acting on the adjacent storage tank in the original scene and adding the firewall were simulated by FLACS software,and the probability of domino effect and individual risk were calculated.The results show that for the location where the surface of storage tank is relatively most affected by thermal radiation(observation point 1),the thermal radiation intensity in the original scene is 310.69 kW/m^(2),and the accident will spread to the neighboring tank and produce a domino effect,with the probability of domino effect as 7.14×10^(-6).After the firewall is added,the thermal radiation intensity decreases to 24.69 kW/m^(2),which is about 1/13 of that in original scene,and no domino effect occurs at this time.In the original scenario,the personal risk is 2.11×10^(-9),and 6.33×10^(-13) after adding the firewall,which is reduced by 4 orders of magnitude,indicating that the thermal blocking effect of firewall on the jet radiation of pressurized flame is significant.The research results can provide some theoretical reference for the construction of safety strategies in chemical enterprises.