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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Micron-sized water spray-cooled quasi-isothermal compression for compressed air energy storage
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Micron-sized water spray-cooled quasi-isothermal compression for compressed air energy storage

机译：微米尺寸水喷雾冷却准等温压缩，用于压缩空气储存

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摘要

Compressed air energy storage (CAES) has emerged as an effective large-scale energy storage technology. This storage system can have many urban applications based on the time-dependent price of electricity. In China, the electric power companies employ batteries to store electricity when the price drops and generate electricity when the price increases. When compared with storage batteries, CAES systems have larger storage capacity (100 MWh, battery 10 MWh), are more environmentally friendly (no heavy metals pollution), and have longer service life. However, the major limitation that restricts the application of such systems is its poor ( 60%) turnaround efficiency (electricity to electricity). Most CAES systems are based on adiabatic compression. Approximately half of the electricity is transformed into heat and exhausted due to the poor heat transfer from the air to environment. Most of the previous research focused on enhancing the heat transfer to achieve quasi-isothermal compression. In this study, a contact heat transfer method is used to cool the compressed air by injecting micron-sized (10-100 mu m) water spray into the compressed air. A transient temperature measurement method is developed to investigate the heat transfer behaviour between air and water. The measurements showed the spray-air heat transfer rate to lie in the range of 10-120 W.m(-2).K-1 . When the compression ratio is two in a compression chamber of 0.94 L, the compression power is reduced from 73.8 J/cycle (adiabatic) to 69.0 J/cycle, using water injection of 0.416 g/cycle. The achieved compression efficiency is improved from 86.7% (adiabatic) to 92.4%.
机译：压缩空气储能（CAES）已成为一种有效的大型储能技术。该存储系统可以基于电力的时间依赖性价格具有许多城市应用。在中国，电力公司使用电池储存电力，当价格下降时，当价格下降时，发电。与蓄电池相比，CAES系统具有较大的存储容量（100兆瓦，电池槽10米），更环保（无重金属污染），使用寿命更长。然而，限制这种系统的应用的主要限制是其差的（＆ 60％）周转效率（电力到电力）。大多数CAES系统基于绝热压缩。大约一半的电力被转化为热量，由于从空气到环境的热传递不良而疲惫不堪。以前的大多数研究都集中在增强热传递以实现准等温压缩。在该研究中，通过将微微尺寸（10-100μm）水喷射到压缩空气中来冷却传热方法来冷却压缩空气。开发了瞬态温度测量方法以研究空气和水之间的传热行为。测量显示喷雾空气传热速率，位于10-120wmm（-2）.k-1的范围内。当压缩比在0.94L的压缩室中的两个时，使用0.416g /循环的注水从73.8J /循环（绝热）降低到69.0J /循环。实现的压缩效率从86.7％（绝热）提高至92.4％。

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