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为得到某恒温间歇反应冷却系统临界温度Tc并评估该反应体系的热危险性,基于间歇反应体系热参数的敏感性,探讨数值计算方法和选用4种反应热失控临界判据得到的不同Tc值。结果表明,数值计算方法得到了反应体系的Tc为31.7℃,Semenov判据、Sliding判据、Da/St判据得到的Tc值分别为10℃,17℃和27℃;无量纲绝热温升B给出的结论是,在允许的工艺温度范围内,该反应对任意的冷却系统温度都处于难以控制状态。数值计算方法及各判据得到的Tc的较大差异性说明各方法均有一定的局限性。在运用参数敏感性分析的基础上,结合风险矩阵图方法对系统冷却失效的热危险性进行评估,得到不同Tc下风险可接受、有条件接受及不可接受对应的参数范围的物料累积度Xac与最大反应速率到达时间θ间的关系。
In order to obtain the critical temperature Tc of a batch system of constant temperature reaction and evaluate the thermal risk of the reaction system, the numerical calculation method and the different Tc values . The numerical results show that the Tc of the reaction system is 31.7 ℃. The Semenov criterion, Sliding criterion and Da / St criterion are 10 ℃, 17 ℃ and 27 ℃, respectively. The dimensionless adiabatic temperature rise B It is concluded that the reaction is in an uncontrolled temperature for any given cooling system within the permissible process temperature range. The numerical method and the large difference of Tc obtained from each criterion indicate that each method has some limitations. Based on the analysis of parameter sensitivity and the risk matrix diagram method, the thermal risk of system cooling failure is evaluated, and the cumulative degree of material Xac with acceptable, conditional acceptance and unacceptable corresponding parameters under different Tc is obtained. The relationship between the maximum reaction rate arrival time θ.