| 摘要: |
| 目的 在液化天然气（liquefied natural gas，LNG）接收站各大系统中，针对蒸发气体（boil-off gas，BOG）处理工艺系统进行安全运行及节省能耗的分析研究。方法 对比分析了接收站现有再冷凝工艺和二阶压缩再冷凝工艺，在二阶压缩再冷凝工艺基础上提出了二次预冷优化，基于国内某接收站实际运行数据并运用ASPEN-HYSYS软件进行模型建立与模拟分析，针对不同工况建立了不同模拟模型。 结果 经改进后的二阶压缩二次预冷BOG再冷凝工艺可以有效地针对不同工况进行优化，将研究结果与某实际接收站数据结合进行模拟验证得到数据结果显示，优化后的工艺对比原工艺总能耗降低了606.2 kW，节能率为14.14%。 结论 BOG温度与BOG压缩机出口压力对再冷凝工艺影响很大，降低压缩机出口压力使压缩机出口比焓降低，通过预冷工艺抵消因降低压缩机出口压力带来的物料比增加的影响，最终达到降低总能耗的目的。 |
| 关键词: LNG接收站 BOG处理系统 再冷凝工艺 BOG压缩机出口压力 天然气 预冷工艺 优化 能耗 |
| DOI：10.3969/j.issn.1007-3426.2025.03.007 |
| 分类号: |
| 基金项目:国家自然科学基金面上项目“南海干湿交替环境中多因素耦合作用下X80管线钢应力腐蚀行为与机理研究”（52274062）；辽宁省博士科研启动基金“天然气掺氢输送X80管线钢焊缝缺陷处脆性开裂行为与机理研究”（2013-BS-198）；辽宁省教育厅基本科研项目“高钢级输氢管线钢焊缝区脆性断裂行为与调控机制”(LJKMZ20220734)；国家自然科学基金青年基金项目“X80管线钢环焊缝缺陷处多轴应力腐蚀开裂的跨尺度演变机制”（52404058） |
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| Simulation and optimization of the BOG recondensation process in the LNG receiving station |
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ZHAO Ting1, SUN Dongxu1, ZHANG Ying2, HU Benyuan3, XIE Fei1, WU Ming1
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1.College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, Liaoning, China;2.Oil Production Engineering Research Institute of Xinjiang Oilfield Company, Karamay, Xinjiang, China;3.PetroChina Jiangsu Liquefied Natural Gas Co., Ltd., Nantong, Jiangsu, China
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| Abstract: |
| Objective In the major systems of liquefied natural gas (LNG) receiving stations, the safe operation and energy saving of boil-off gas (BOG) treatment process systems are analyzed and studied. Method The existing recondensation process and the second-order compression recondensation process of the receiving station were compared and analyzed. Based on the second-order compression recondensation process, the secondary precooling optimization was proposed. With the actual operation data of a domestic receiving station and the use of ASPEN-HYSYS software for model establishment and simulation analysis, different simulation models were established for different working conditions. Result The improved second-order compression secondary precooling recondensation process could be effectively optimized for different working conditions. The research results were combined with the data of an actual receiving station for simulation verification. The data results showed that the total energy consumption of the optimized process was reduced by 606.2 kW compared with the original process, and the energy saving rate was 14.14%. Conclusion The BOG temperature and the outlet pressure of the BOG compressor have the greatest influence on the recondensation process, and then the optimization method is obtained, that is, the specific enthalpy of the compressor outlet is decreased by reducing the outlet pressure of the compressor, and the pre-cooling process is used to offset the effect of the material ratio increase caused by reducing the outlet pressure of the compressor. Finally, the purpose of reducing the total energy consumption is achieved. |
| Key words: LNG receiving station BOG processing system recondensation process outlet pressure of BOG compressor natural gas pre-cooling process optimization energy consumption |
