关键词: 外浮顶储罐, VOCs, 排放量, 边缘密封损失, 挂壁损耗, 浮盘附件损耗, 污染控制要求

Abstract:

In this paper, it is introduced volatile organic compounds(VOCs) calculation method about the crude oil external floating roof storage tanks. Taking the petroleum depot composed of 12 sets of 100 dam³ of crude oil external floating roof storage tanks with an annual turnover of 10 million tons as the research object, the influence of the VOCs emissions of the parameters such as different seal forms, shell clingage and deck fittings are compared and discussed, and the main influence factors are summarized and analyzed. The results show that the VOCs emission can be reduced by 70% after adding the secondary seal; The VOCs emission under the heavy rust condition is nearly 100 times that under the light rust condition; The VOCs emission of the deck fittings with seals can also be reduced by 36.5% compared with the deck fittings without seals; The withdrawal loss is the largest source of VOCs emission, through the comparative analysis of the two combined conditions. In combination with the current national management requirements and technical and economic conditions, the selection and management suggestions for reducing VOCs emissions of external floating roof storage tanks are put forward, such as primary high-efficiency sealing and secondary sealing, sealing of deck fittings, and increasing tank cleaning frequency.

Key words: external floating roof storage tanks, VOCs, emission, rim seal loss, withdrawal loss, deck fittings loss, pollution control requirements