安全、健康和环境

为了解决夏季高温环境下，油气回收工艺无法达到国家或行业油气排放标准的问题，基于传统活性炭吸附耦合汽油喷淋的油气回收工艺，提出在关键节点添加预冷器的改进工艺流程。利用Aspen Plus软件，搭建不同的油气回收工艺流程模型，研究不同方法的回收工艺与换热效率的关系，提出优化方案。案例结果表明：两个关键节点的预冷器并联时，预冷器1、预冷器2的最大换热面积分别为10.77 m²、0.21 m²,总最大冷却水用量为24.58 t/h。两个关键节点的预冷器串联时，预冷器1、预冷器2的最大换热面积分别为10.79 m²、0.22 m²,总最大冷却水用量为23.36 t/h。预冷器1可将进入吸附罐前的油气温度由45℃降至30℃,预冷器2可将进入吸收塔前的油气温度由100℃降至35℃。本文提供的两种冷却方案说明，串联布置所需能耗较低，并联布置运行较稳定。

To address the issue that the oil vapor recovery process fails to meet the national or industry emission standards under high-temperature summer conditions, an improved process flow of adding a pre-cooler at key nodes is proposed based on the traditional vapor recovery process of activated carbon adsorption coupled with gasoline spray. Using the Aspen Plus software, different vapor recovery process flow models were built to study the relationship between the recovery processes of different methods and the heat exchange efficiency, and optimization schemes were proposed. The case results indicated that when the precoolers at the two key nodes were connected in parallel, the maximum heat exchange areas of Precooler 1 and Precooler 2 were 10.77 m² and 0.21 m², respectively, and the total maximum cooling water consumption was 24.58 t/h. When the precoolers at two key nodes were connected in series, the maximum heat exchange areas of Precooler 1 and Precooler 2 were 10.79 m² and 0.22 m², respectively, and the total maximum cooling water consumption was 23.36 t/h. Pre-cooler 1 can reduce the temperature of oil vapor before entering the adsorption tank from 45 ℃ to 30 ℃, and Pre-cooler 2 can reduce the temperature of oil vapor before entering the absorption tower from 100 ℃ to 35 ℃. The two cooling schemes provided in this article illustrate that the series arrangement requires less energy consumption, while the parallel arrangement operates more stably.