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闪蒸气(Boil-off Gas,BOG)的处理关系着LNG接收站的能耗及安全、平稳运行。对比了目前常用的BOG直接压缩工艺和再冷凝液化工艺在工艺流程及能耗方面的差异,并分析了外输量、外输压力对BOG处理工艺能耗的影响。由此提出了BOG处理工艺工艺的优化措施:基于现有BOG处理工艺流程中加热再冷却过程中存在冷热交换而造成能量损耗,利用LNG冷能通过换热器冷却压缩后的BOG,以LNG自身冷能取代现有BOG处理流程中的耗能元件再冷凝器,同时降低压缩机出口BOG的温度,减少加热再冷却过程能量损耗。利用HYSYS软件分别对优化前后BOG处理工艺进行能耗分析,结果表明:BOG处理工艺优化前后能耗分别为2 677.82 k W、1 990.77 k W,优化后BOG处理工艺节约能耗约25.66%。
The treatment of Boil-off Gas (BOG) is related to the energy consumption, safety and smooth operation of the LNG receiving station. The differences between the current BOG direct compression process and the re-condensation liquefaction process in the aspects of process flow and energy consumption are compared. The influence of the output and the external pressure on the energy consumption of the BOG treatment process is also analyzed. Therefore, the optimization measures of BOG treatment process are proposed: energy loss is caused by the existence of cold and heat exchange during heating and re-cooling in the existing BOG treatment process, LNG cold energy can be used to cool the compressed BOG through a heat exchanger, LNG Self-cooling can replace the energy-consuming component re-condenser in the existing BOG treatment process, meanwhile reducing the temperature of the BOG at the exit of the compressor and reducing the energy loss during the heating and then cooling process. HYSYS software was used to analyze the energy consumption of the BOG treatment before and after optimization. The results showed that the energy consumption of the BOG treatment was 2 677.82 k W and 1 990.77 k W before and after optimization, respectively. The energy saving of the BOG treatment was about 25.66%.