Liquid Natural Gas Cold Energy Recovery for Integration of Sustainable District Cooling Systems: A Thermal Performance Analysis
Liquid Natural Gas Cold Energy Recovery for Integration of Sustainable District Cooling Systems: A Thermal Performance Analysis
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DOI：
10.3390/inventions8050121
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发表时间：
2023-09
期刊：
影响因子：
3.4
通讯作者：
Yang Luo;Xuesong Lu;Yi Chen;John Andresen;Mercedes Maroto-Valer
中科院分区：
文献类型：
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作者：
Yang Luo;Xuesong Lu;Yi Chen;John Andresen;Mercedes Maroto-Valer
本文研究了液化天然气（LNG）在波纹板式换热器中的传热特性，并探讨了其在冷能回收中的应用，以提高能源效率。该研究旨在将该技术整合到一座 500 MW 燃气发电厂和区域供冷系统中，为可持续城市发展做出贡献。通过计算流体动力学模拟和实验验证，检查了波纹板换热器中液化天然气的传热行为，强调了通道壁上的气膜对于液化天然气和水/乙二醇之间高效传热的重要性。该研究分析了液化天然气临界点以下和之上的热交换特性。在临界点以下，液化天然气表现为不可压缩流体，而在临界点以上，可压缩超临界状态可以实现大量能量回收和出口处的温度升高，凸显了冷能回收的潜力。结果证明了超过临界点的冷能回收的有效性，与传统系统相比，可显着节省能源并提高效率。确定最佳操作参数，例如通道数量和流量比，以实现成功的冷能回收。这项研究为可持续城市规划和向低碳能源系统的过渡提供了宝贵的见解，有助于实现创造环保和有弹性的城市环境的总体目标。
This paper investigates the heat transfer properties of liquefied natural gas (LNG) in a corrugated plate heat exchanger and explores its application in cold energy recovery for enhanced energy efficiency. The study aims to integrate this technology into a 500 MW gas-fired power plant and a district cooling system to contribute to sustainable city development. Using computational fluid dynamics simulations and experimental validation, the heat transfer behaviour of LNG in the corrugated plate heat exchanger is examined, emphasising the significance of the gas film on the channel wall for efficient heat transfer between LNG and water/ethylene glycol. The study analyses heat exchange characteristics below and above the critical point of LNG. Below the critical point, the LNG behaves as an incompressible fluid, whereas above the critical point, the compressible supercritical state enables a substantial energy recovery and temperature rise at the outlet, highlighting the potential for cold energy recovery. The results demonstrate the effectiveness of cold energy recovery above the critical point, leading to significant energy savings and improved efficiency compared to conventional systems. Optimal operational parameters, such as the number of channels and flow rate ratios, are identified for successful cold energy recovery. This research provides valuable insights for sustainable city planning and the transition towards low-carbon energy systems, contributing to the overall goal of creating environmentally friendly and resilient urban environments.