Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials
Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials
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DOI：
10.1002/2475-8876.12297
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发表时间：
2022-09
影响因子：
0.9
通讯作者：
H. Harashima;Eisaku Sumiyoshi;Kazuhide Ito
中科院分区：
文献类型：
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作者：
H. Harashima;Eisaku Sumiyoshi;Kazuhide Ito
假设工厂和化工厂因自然灾害或人为失误造成危险液体化学品泄漏，准确估计暴露风险并设计适当的疏散计划和降低风险措施非常重要。室内居民接触泄漏化学品的风险可以通过气相浓度的直接测量或理论/数值估计来估计。尽管工作场所气相浓度的数学模型对于在设计阶段预测暴露浓度至关重要，但实用模型尚未完全建立。我们之前提出了实用的数值模型，以液体甲苯作为代表性危险化学品来评估液体化学品意外泄漏后的室内气相浓度分布。在这项研究中，在小型测试室中再现了液体乙酸乙酯（一种常用的有机溶剂）泄漏到砂浆地板中的情况，并进行了数值分析。结果表明，室排气浓度的时间历程有一个尖锐的峰值，与甲苯的浓度有显着差异。三维计算流体动力学 (CFD) 分析结合实用的乙酸乙酯排放模型，再现了砂浆材料上泄漏的乙酸乙酯的外部和内部排放特征。模型与实验数据表现出合理的一致性。
Assuming the leakage of hazardous liquid chemicals in factories and chemical plants caused by natural disasters or human error, it is important to precisely estimate exposure risk and design appropriate evacuation plans and risk‐reduction measures. The exposure risk of indoor residents to leaked chemicals may be estimated using direct measurements or theoretical/numerical estimations of gas‐phase concentrations. Although mathematical models of gas‐phase concentration in the workplace are essential for predicting exposure concentrations at the design stage, practical models have not yet been fully established. We previously proposed practical numerical models to assess indoor gas‐phase concentration distributions after the accidental leakage of liquid chemicals using liquid toluene as a representative hazardous chemical. In this study, the leakage of liquid ethyl acetate, a commonly used organic solvent, into mortar flooring was reproduced in a small test chamber, and numerical analysis was performed. The results showed that the time history of the chamber exhaust concentration had a sharp peak and differed significantly from that of toluene. Three‐dimensional computational fluid dynamics (CFD) analysis incorporating practical ethyl acetate emission models reproduced the external and internal emission characteristics of leaked ethyl acetate on the mortar material. The models showed reasonable agreement with the experimental data.