内容：
LNG接收站的大型储罐在投用前需要逐步冷却至-162℃,冷却前储罐内充满氮气,冷却过程中将产生大量高含氮气的蒸发气体(BOG),LNG接收站工艺系统无法对其回收利用,只能直接排放至火炬;同时LNG储罐冷却中后期产生BOG的流量极大,超出了接收站BOG的回收处理能力,大量BOG被排放至火炬,造成大量浪费。为此,珠海LNG接收站通过调研国内已投用LNG储罐的冷却方式,并对其预冷过程进行研究,创新性地提出了储罐冷却前下排式氮气置换法和"BOG+LNG"储罐冷却工艺,降低了LNG储罐冷却过程中BOG的氮气含量,提高了LNG接收站冷能利用效率,同时也降低了BOG的产生量,使之能更好地匹配于LNG接收站BOG的回收处理能力。现场实验结果表明:(1)下排式氮气置换法能够在LNG储罐冷却前将罐内氮气置换至合格要求;(2)"BOG+LNG"储罐冷却工艺能够有效降低LNG储罐冷却过程中BOG的产生量,使之不超过LNG接收站的回收处理能力,实现了LNG储罐冷却过程中BOG的零排放。该方法可作为LNG储罐投产试车的借鉴和参考。 The large tanks of the LNG receiving station need to be cooled to -162 ° C before being put into use. Before the cooling, the tank is filled with nitrogen. During the cooling process, a large amount of high-nitrogen-containing vaporized gas (BOG) will be generated. The LNG receiving station process system can not Its recycling, can only be directly discharged to the torch; at the same time LNG tank cooling in the late BOG flow great, beyond the receiving station BOG recovery processing capacity, a large number of BOG was discharged to the torch, resulting in a lot of waste. For this reason, the LNG receiving station in Zhuhai has made a study on the cooling method of LNG storage tanks in China and the pre-cooling process, and put forward the pre-cooling method and "BOG + LNG" The tank cooling process reduces the nitrogen content of the BOG during the cooling of the LNG storage tank, improves the cold energy efficiency of the LNG receiving station, and reduces the amount of BOG generated so that it can better match the LNG receiving station BOG Recycling capacity. (2) "BOG + LNG" tank cooling process can effectively reduce the LNG storage tank cooling process. (2) "BOG + LNG" tank cooling process can effectively reduce the LNG tank cooling process The amount of BOG generated in the LNG receiving station does not exceed the recycling capacity, to achieve the LNG tank cooling process BOG zero emissions. This method can be used as reference and reference for LNG storage tank commissioning.

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