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ANALYSIS OF DISSOLVED GAS IN THE APPLICATION OF LIQUID PISTON GAS COMPRESSION

Longzhong Huang
Mechanical Engineering Department, University of Minnesota, 111 Church St. S.E., Minneapolis MN, 55455

Terrence W. Simon
Department of Mechanical Engineering, University of Minnesota, 111 Church St. S.E., Minneapolis, Minnesota 55455, USA

Perry Y. Li
Department of Mechanical Engineering, University of Minnesota, 111 Church St. S.E., Minneapolis, Minnesota 55455, USA

Edward J. Hummelt
Eaton Corporation, W126 N7250 Flint Drive, Menomonee Falls, WI, 53051

DOI: 10.1615/TFESC1.prm.012869
pages 2217-2228


キーワード: liquid piston, dissolved gas, porous media, dispersion, mass transfer

要約

Liquid piston compression technology is being explored as a way to achieve high-pressure compression in Compressed Air Energy Storage (CAES) systems. When combined with a porous medium, a liquid piston compressor is able to provide near-isothermal compression, and high efficiency. However, the being compressed can dissolve into the liquid resulting in loss of compressed output. Also, the dissolved gas in the liquid lines can cause aeration that causes damage to pumps and valves. To understand this gas transport phenomenon in the liquid and to evaluate the total amount of gas dissolved, a numerical model was developed. Dispersion due to the porous medium is found to be the dominant mode of mass transfer. The dispersion coefficient is calculated based on an experimental correlation that is given in terms of flow velocity, porous medium geometry and molecular diffusion coefficient. The numerical model is used to investigate a case study in which a water liquid piston is used for air compression. The amount of dissolved gas under various conditions is calculated, such as gas concentration of the inlet flow to the compressor and discharge pressure to the storage tank at the end of compression. The effects of different types of liquids are also quantified by applying in the model the different solubility values of gases in liquids.

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