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Investigation of Mixing Behavior of Hydrogen Blended to Natural Gas in Gas Network

Mingmin Kong (), Shuaiming Feng (), Qi Xia (), Chen Chen (), Zhouxin Pan () and Zengliang Gao ()
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Mingmin Kong: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Shuaiming Feng: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Qi Xia: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Chen Chen: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Zhouxin Pan: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China
Zengliang Gao: Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China

Sustainability, 2021, vol. 13, issue 8, 1-17

Abstract: Hydrogen is of great significance for replacing fossil fuels and reducing carbon dioxide emissions. The application of hydrogen mixing with natural gas in gas network transportation not only improves the utilization rate of hydrogen energy, but also reduces the cost of large-scale updating household or commercial appliance. This paper investigates the necessity of a gas mixing device for adding hydrogen to existing natural gas pipelines in the industrial gas network. A three-dimensional helical static mixer model is developed to simulate the mixing behavior of the gas mixture. In addition, the model is validated with experimental results. Parametric studies are performed to investigate the effect of mixer on the mixing performance including the coefficient of variation ( COV ) and pressure loss. The research results show that, based on the, the optimum number of mixing units is three. The arrangement of the torsion angle of the mixing unit has a greater impact on the COV . When the torsion angle θ = 120°, the COV has a minimum value of 0.66%, and when the torsion angle θ = 60°, the COV has a maximum value of 8.54%. The distance of the mixing unit has little effect on the pressure loss of the mixed gas but has a greater impact on the COV . Consecutive arrangement of the mixing units (Case A) is the best solution. Increasing the distance of the mixing unit is not effective for the gas mixing effect. Last but not least, the gas mixer is optimized to improve the mixing performance.

Keywords: natural gas; hydrogen; helical static mixer; CFD; pressure loss of helical static mixer; coefficient of variation ( COV ) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
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