Shukla Pragati, Manivannan S, Mandal D
Alkali Materials & Metal Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Heliyon. 2020 Dec 2;6(12):e05549. doi: 10.1016/j.heliyon.2020.e05549. eCollection 2020 Dec.
Due to high vapour pressure at ambient conditions, exposed mercury contributes significant vapour concentration in working atmosphere. Ventilation is a conventional, cheap and very effective method to bring down the concentration of hazardous materials like mercury vapour below permissible limit. In this work a numerical model was developed to obtain intuitive understandings of the spatial distribution of mercury vapors from an exposed surface. The model was validated with experimental data generated using a precinct ventilation system with 8.14% absolute average error. a Validated model was used to study the effect of air flow rate (100-1200 LPM) and impact of architectural design of the containment for fixed exposed mercury surfaceon the final (diluted) mercury concentration. Comparative analysis shows that modification in structural design offers a reduced volume averaged exit mercury concentration and also the reduced peak mercury concentration(C) in the computational domain. Computational approach outlined in this work can be used to estimate spatial variation of mercury vapor concentration and to locate and quantify regions of high local concentration of mercury in various geometries.
由于在环境条件下蒸气压较高，暴露的汞会在工作环境中产生显著的蒸气浓度。通风是一种传统、廉价且非常有效的方法，可将汞蒸气等有害物质的浓度降低至允许限值以下。在这项工作中，开发了一个数值模型，以直观了解暴露表面汞蒸气的空间分布。该模型通过使用区域通风系统生成的实验数据进行了验证，绝对平均误差为8.14%。使用经过验证的模型研究了空气流速（100 - 1200升/分钟）以及固定暴露汞表面的 containment 建筑设计对最终（稀释后）汞浓度的影响。对比分析表明，结构设计的修改可降低计算域内体积平均出口汞浓度以及汞的峰值浓度（C）。这项工作中概述的计算方法可用于估计汞蒸气浓度的空间变化，并定位和量化各种几何形状中汞局部高浓度区域。
