液化天然气接收站内BOG再液化装置研究

Study of BOG Re-Liquefied Installation in LNG Terminal

摘要: 液化天然气(LNG)作为天然气的一种存在形式，具有储存和运输的优势便利。目前我国已在沿海城市建设了多个液化天然气接收站和卫星站来接收国外进口LNG。接收站运营过程中将产生大量的蒸发气体(BOG)，当没有或者仅有少量出口运输需求时，当天然气终端和外输管网建设不同步的时候，过量的BOG将进入火炬燃烧掉，造成极大的浪费。在接收站内建设一个撬装式的BOG再液化装置，将站内产生的部分BOG再液化后返回LNG储罐，这对接收站的安全和经济运营具有重要的意义。本文以国内某接受站为例，对站内撬装式的BOG再液化装置进行了描述，介绍了混合制冷剂再液化流程、压缩机和换热器等主要设备选型、装置能耗、占地面积和开停车方案。

Abstract: Liquefied natural gas (LNG) is an existing form of natural gas, which has the advantages of storage and transportation. Nowadays, many LNG terminals and satellite stations have been built along coastal city in our country to receive foreign LNG. Lots of BOG (boil of gas) will be produced during the operation process. Excess BOG burns through the torch when there is no or a small amount export demand, or when the construction of LNG terminal and export network cannot be completed at the same time. This leads to great waste. Part of BOG is re-liquefied and returns to LNG tank through a skid mounted BOG re-liquefied installation in the terminal, which is meaning for the safety and economic operation of LNG terminal. A skid mounted BOG re-liquefied installation in a LNG terminal is described in this article. Also, the mixed refrigerant re-liquefaction process, the main equipment such as compressor and heat exchanger, the consumption, the floor space and open parking scheme are introduced.