基于场景频率的石化装置气体探测覆盖率评估

Evaluation on gas detection coverage of petrochemical plant based on scene frequency

为解决现有评估方法未能定量分析泄漏场景发生频率在石化过程模块中的分布不均匀性,提出1种基于场景频率的石化装置气体探测覆盖率评估方法,包括典型泄漏场景库构建、基于计算流体动力学(CFD)的气体泄漏扩散行为仿真以及基于场景频率的探测覆盖率计算3个步骤;提出1种定量筛选方法以选择更具代表性的高频泄漏场景,在表征装置泄漏场景特点的同时节约计算资源。研究结果表明:通过引入泄漏场景频率对覆盖率评估计算公式进行升级,案例分析结果显示该计算方法能够更加真实准确地对气体探测系统有效性进行评估。研究结果可提高石化装置气体探测覆盖率评估工作的效率及准确性。

In order to solve the problem that the existing evaluation methods fail to quantitatively analyze the uneven distribution of leakage scene frequency in petrochemical process modules,an evaluation method for the gas detection coverage of petrochemical plants based on scene frequency was proposed,which included three steps:the construction of typical leakage scene library,the simulation of gas leakage and diffusion behavior based on CFD,and the calculation of detection coverage based on scene frequency.A quantitative screening method was proposed to select more representative high-frequency leak scenes,so as to characterize the leakage scene characteristics of the plant and save the computational resources at the same time.The results show that by introducing into the leakage scene frequency,the coverage evaluation formula is upgraded.The comparison of case study results indicates that the calculation method is able to evaluate the effectiveness of the gas detection system more realistically and accurately.