本设计中BOG控制系统是整个LNG自控系统的一部分，由于写作需要，本文只针对BOG压缩机及BOG再冷凝器等核心设备控制功能的设计与实现进行论述。
This system is the part of the LNG DCS control system. According to the project requirements, this paper focuses on the core equipment controlling such as BOG compressor and BOG recondenser, .
立式筒体及其内部的塔内件、冷凝器和再沸器共同构成精馏塔。
The vertical shell houses the column internals and together with the condenser and reboiler, constitute a distillation column.
包括低压精馏塔、加压精 馏塔、塔釜再沸器、塔顶冷凝器和辅助冷凝器；
The system comprises a low pressure rectifying tower, a pressurizing rectifying tower, a tower kettle reboiler, an overhead condenser and an auxiliary condenser;
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