Effect of non-condensable gas on the performance of steam-water ejector in a trigeneration system for hydrogen production: An experimental and numerical study |
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| Affiliation: | 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, PR China;2. Department of Energy and Power Engineering, Shandong University of Technology, Zibo 255000, Shandong, PR China;1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, PR China;2. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, PR China;1. School of Nuclear Science and Engineering, North China Electric Power University, No.2, Beinong Road, Beijing 102206, China;2. Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy, Beijing 102206, China;3. State Power Investment Corporation Research Institute, Beijing 102209, China;4. National Energy Key Laboratory of Nuclear Power Software, Beijing 102209, China;1. Faculty of Mechanical & Energy Engineering, Department of Energy Conversion, Shahid Beheshti University, Tehran, Iran;2. Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam |
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| Abstract: | An ejector containing phase changing gas-liquid flow process acts as a popular and decisive device in multiple industrial applications, including the hydrogen production, electricity production, fuel cells, refrigeration, petroleum industry and desalination systems. However, non-condensable gas is inevitable for the usual operation of phase-changing gas-liquid ejector in the trigeneration or electrolyzer system for hydrogen production, and rarely research is concerned with this issue. In the present study, the effect of non-condensable gas contained in the condensable gas on the characteristics of gas-centered water ejector is presented, with steam, water and air acting as the gas, liquid and non-condensable gas, respectively. Experimentally, the flow rate of steam is controlled to be 1.45 g/s with an absolute pressure of 120 kPa, the air flow rate varies from 0 to 0.14 g/s, resulting in a non-condensable gas concentration ranging from 0 to 9%, and the resulted water flow rate at 100 kPa and 282.15 K changes from 34.7 to 37.3 g/s. Combined with the numerical methods, the performance of ejector expressed in ejected water flow rate was found to increase firstly with a small amount of non-condensable gas, and decrease when the non-condensable gas reaches a certain amount. In addition, the distributions of multiple local flow parameters including pressure, condensation rate and gas volume fraction, velocity and temperature inside the ejector were shown for different non-condensable concentration, by which the mechanism for the change of ejector performance under varying non-condensable concentration was demonstrated. These findings are initiative and insightful for the ejector design optimization in the trigeneration system for hydrogen production and the proposed numerical models can be utilized in analysis and design of steam ejector with non-condensable gas involved. |
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| Keywords: | Steam-water ejector Hydrogen production Gas-liquid flow Non-condensable gas Direct contact condensation (DCC) |
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