摘要
随着环境保护的需要和能源的日益紧张,国内液化天然气(LNG)行业发展速度越来越快。LNG气化产生蒸发气(BOG),若不对其进行处理,可能造成接收站超压继而引发事故;若对其直接放空至火炬燃烧,则不仅浪费了能源,同时又污染了环境。因此,BOG回收工艺成为LNG接收站的重要组成部分。BOG回收处理方法主要有2大类,即加压外输方法和再液化方法。由于不同规模的LNG接收站产生的BOG蒸发量不同,致使各LNG接收站的BOG回收工艺各不相同,本文主要针对直接压缩工艺、再冷凝液化工艺、直接压缩+再冷凝工艺、氮膨胀制冷液化工艺、混合冷剂制冷液化工艺、液氮(或丙烷)制冷液化工艺、蓄冷式再液化工艺7种BOG回收技术的适用条件、工艺流程及优缺点进行评述,并提出有针对性的优化建议。
With the need of environmental protection and the increasing shortage of energy,the domestic natural gas liquefied(LNG)industry is developing faster and faster. LNG gasification produces BOG gas. If it is not treated,it may cause overpressure at the terminal and cause accidents. If it is directly vented to the flare for combustion,it will not only waste energy,but also pollute the environment. Therefore,BOG recovery process has become an important part of LNG terminal. There are two main types of BOG recovery and treatment methods,namely pressurized export method and re-liquefaction method. Due to the different BOG evaporation caused by the size of the LNG terminal,the BOG recovery processes of each LNG terminal are different. This paper mainly focused on the BOG direct compression process,BOG re-condensation liquefaction process,BOG direct compression + re-condensation process,nitrogen expansion refrigeration liquefaction process,mixed refrigerant refrigeration liquefaction process,liquid nitrogen(or propane)refrigeration liquefaction process. The cold storage re-liquefaction process of these seven kinds of BOG recovery technologies were reviewed,including applicable conditions,advantages and disadvantages and process flow,and targeted optimization suggestions were put forward.
作者
靳帅帅
庄琦
JIN Shuaishuai;ZHUANG Qi(School of Petroleum Engineering,Xi'an Shiyou University,Xi'an 710065,China)
出处
《精细石油化工进展》
CAS
2021年第5期50-55,共6页
Advances in Fine Petrochemicals
关键词
BOG回收
直接压缩
再冷凝
制冷液化
BOG recovery
direct compression
recondensation
refrigeration liquefaction
