LNG冷能发电技术现状分析
Analysis on Current Situation of LNG Cold Energy Power Generation Technology
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- 引用格式:
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陈利琼,许培林,孙磊,董文浩,马凯.LNG冷能发电技术现状分析[J].天然气与石油,2013,31(6):0.doi:
.Analysis on Current Situation of LNG Cold Energy Power Generation Technology[J].Natural Gas and Oil,2013,31(6):0.doi:
- DOI:
- 作者:
- 陈利琼1 许培林1 孙 磊1 董文浩1 马 凯2
- 作者单位:
- 1.西南石油大学研究生院，2.中国石油江苏液化天然气有限公司
- 关键词:
- LNG；冷能；发电；效率
LNG; Cold energy; Power generation; Exergy; Efficiency
- 摘要:
- 目前，LNG冷能发电是石油天然气行业节能降耗的一项重要举措，国内外学者对此进行了较深入的研究，并取得一些应用成果，但该技术还存在不少问题。通过对国内外冷能发电技术现状的文献调研，总结了已应用的六种LNG冷能发电技术，包括直接膨胀法、二次媒体法、联合法、混合媒体发电法、布雷顿循环法、燃气轮机利用法，分析比较了各自的优缺点和适应性。指出：布雷顿循法环发电效率最高，可达到55 %，但有冷却器温度的要求；二次媒体法-单工质最低，只有18 %；直接膨胀法虽然冷能利用效率低，仅为24 %，但原理简单。二次媒体法、联合法、燃气轮机法效率低于布雷顿循环法，但适用性强、限制条件少，值得推广。同时介绍了九种新研发但还未应用于实际的方法，为提高LNG冷能发电效率提出了建议。
At present, power generation by using LNG cold energy is an important measure for energy saving and consumption reducing in oil and gas industry. However, the technology also has many problems to be solved. Reviewed are many domestic and international literatures on cold energy power generation technology, summarized are 6 kinds of current LNG cold energy power generation principles, including direct expansion method, secondary media method, combination method, mixed media power generation method, Brayton cycle method and gas turbine method and comparative analysis is conducted on their advantages and disadvantages and adaptability and results show that Brayton cycle power generation has the highest efficiency, up to 55 %; the secondary media has the lowest single working medium, only 18 %. Direct expansion method has low cold energy utilization efficiency, only 24 %, but its principle is simple and high efficient Brayton cycle method has a requirement for cooler temperature. The secondary media method, combination method and gas turbine method have strong applicability and less restrictive conditions and are worth promoting. Finally, some suggestions are proposed for increasing domestic LNG cold energy efficiency.
