Research Advances in Natural Gas and Hydrogen Blending Processes
Mixing hydrogen with natural gas in certain proportions and using existing natural gas pipeline infrastructure for transportation is an effective method for achieving low-cost and large-scale hydrogen energy transport.The mixing process of natural gas and hydrogen determines the uniformity and accuracy of the blended hydrogen-natural gas mixture and is a core technology for hydrogen-blended natural gas pipeline transportation.This paper reviews and analyzes recent international and domestic research advancements in natural gas and hydrogen blending processes through literature surveys and summarizes the blending principles,advantages & disadvantages,and operational adaptability of hydrogen blending technologies without or with auxiliary mixing device in order to promote its development.The results indicate that in the hydrogen blending processes such factors as blending conditions,blending pipeline structure,and hydrogen injection points significantly affect the length of the non-uniform mixture pipeline without auxiliary mixing device and it is recommended to optimize the design of blending process parameters to reduce this length.Precise control of the hydrogen blending ratio under varying flow and pressure conditions is a key challenge in the hydrogen blending processes with auxiliary mixing device.It suggests further research on high-precision automated control technology for hydrogen blending ratios.Significant differences exist among different blending processes regarding blending uniformity,ratio control accuracy,operational adaptability,and automation levels,which should be comprehensively considered in practical engineering applications.
Natural gasPipelineHydrogen-blended transportationHydrogen blending process
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