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为分析石化芳烃装置区质检工采样过程中的苯滴漏所造成的职业暴露,采用苯液体挥发模型与计算流体力学(CFD)技术相结合的方法,推导地面滴漏的苯液体挥发出来的蒸气浓度随时间变化函数。利用自定义函数(UDF),将挥发模型编译进CFD软件中进行分析。将此方法应用于天津某石化芳烃装置区内。实例结果表明:后取样点呼吸带高度处的苯浓度会受到先取样点滴漏苯液体挥发蒸气扩散的影响,当后取样点位于先取样点下风向时这种影响更加明显。此外,采样工沿着取样路径的短时间苯职业暴露水平为9.76 mg/m3,低于我国的短时间暴露阈限值(PC-STEL)。
In order to analyze the occupational exposure caused by benzene drip-hour in sampling process of petrochemical aromatics unit, the vapor concentration volatilized from benzene dripped on the surface was derived by a combination of benzene liquid volatilization model and computational fluid dynamics (CFD) Function over time. Using a custom function (UDF), the volatility model is compiled into the CFD software for analysis. This method is applied to Tianjin petrochemical aromatics plant area. The experimental results show that the concentration of benzene at the breathing zone of the latter sampling point will be affected by the vapor diffusion of the first sampling liquid, and this effect is more obvious when the sampling point is located downstream of the sampling point. In addition, the occupational exposure level of benzene to sample workers along the sampling path for a short period of time was 9.76 mg / m3, which is lower than the PC-STEL threshold of China.