Department of Environmental Engineering, National Chung Hsing University, Taichung City 402, Taiwan.
Environ Monit Assess. 2013 Aug;185(8):6819-30. doi: 10.1007/s10661-013-3067-9. Epub 2013 Jan 12.
This study evaluates emission characteristics of volatile organic compounds (VOCs) caused by standing loss (L S) and working loss (L W) of three vertical fixed-roof p-xylene (p-X) liquid tanks during 1-year storage and filling operation. The annual net throughput of the tanks reached 70,446 t, resulting in 9,425 kg of p-X vapor emission including 5,046 kg of L S (53.54 %) and 4,379 kg of L W (46.46 %). The estimated L W of AP-42 displayed better agreement with the measured values of a VOC detector than the estimated L S of AP-42. The L S was best correlated with the liquid height of the tanks, while the L W was best correlated with the net throughput of the tanks. As a result, decreasing vapor space volume of the tanks and avoiding high net throughput of the tanks in a high ambient temperature period were considered as effective means to lessen VOC emission from the fixed-roof organic liquid storage tank.
本研究评估了 3 座立式固定顶对二甲苯（p-X）液体储罐在 1 年储存和充装作业过程中由于静止损失（L S）和工作损失（L W）引起的挥发性有机化合物（VOCs）排放特性。储罐的年净吞吐量达到 70446 吨，导致 9425 公斤的 p-X 蒸气排放，其中包括 5046 公斤的 L S（53.54%）和 4379 公斤的 L W（46.46%）。AP-42 的估计 L W 与 VOC 探测器的测量值更吻合，而 AP-42 的估计 L S 则不然。L S 与储罐的液位高度相关性最好，而 L W 与储罐的净吞吐量相关性最好。因此，减少储罐的蒸气空间体积和避免在环境温度较高的时期高净吞吐量被认为是减少固定顶有机液体储罐 VOC 排放的有效手段。
