重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条...重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条件进行了数值模拟,考察障碍物对气体扩散的影响并与实验结果进行对比。结果表明,模拟结果与实验数据的吻合性较好,证明CFD软件能够较准确地模拟障碍物地形条件下的重气扩散过程。展开更多
Three solid organic peroxides, benzoyl peroxide (BPO), dicumyl peroxide (DCP) and cyclohexanone peroxide (CCP) were tested by using simultaneous TG-DSC analyzer (SDT Q600) with small sample mass, and the thermal data ...Three solid organic peroxides, benzoyl peroxide (BPO), dicumyl peroxide (DCP) and cyclohexanone peroxide (CCP) were tested by using simultaneous TG-DSC analyzer (SDT Q600) with small sample mass, and the thermal data obtained from different scanning rate were analyzed by the Popescu multiple scanning rate method for the first time.Then, the values of self-accelerating decomposition temperature (SADT) of 25 kg standard package were computed according to the thermal explosion theory.The results showed that the values of activation energy and pre-exponential factor of these three solid organic peroxides by using the Popescu multiple scanning rate method were more precise and more credible than that by using the single scanning rate method.Based on correct calculation of these kinetic parameters, SADT can be accurately safely, easily, quickly evaluated with thermodynamic parameters based on thermal explosion theory.展开更多
文摘重气泄漏扩散是一种危害性较大的多发事故,而一旦在人口密集区域发生泄漏事故,周围居民将处境危险。重气泄漏后一般沿地面扩散,而地形条件是影响其扩散行为的重要因素。本文利用计算流体力学方法(CFD)对Thorney Island Trial026实验条件进行了数值模拟,考察障碍物对气体扩散的影响并与实验结果进行对比。结果表明,模拟结果与实验数据的吻合性较好,证明CFD软件能够较准确地模拟障碍物地形条件下的重气扩散过程。
文摘Three solid organic peroxides, benzoyl peroxide (BPO), dicumyl peroxide (DCP) and cyclohexanone peroxide (CCP) were tested by using simultaneous TG-DSC analyzer (SDT Q600) with small sample mass, and the thermal data obtained from different scanning rate were analyzed by the Popescu multiple scanning rate method for the first time.Then, the values of self-accelerating decomposition temperature (SADT) of 25 kg standard package were computed according to the thermal explosion theory.The results showed that the values of activation energy and pre-exponential factor of these three solid organic peroxides by using the Popescu multiple scanning rate method were more precise and more credible than that by using the single scanning rate method.Based on correct calculation of these kinetic parameters, SADT can be accurately safely, easily, quickly evaluated with thermodynamic parameters based on thermal explosion theory.
