Investigation on the Influence of Natural Gas and Hydrogen Mixing Flow Based on SMX Static Mixer
In order to obtain a uniform mixed fuel of natural gas and hydrogen for the stable and safe transportation of hydrogen mixing gas pipeline,the mixing characteristics and influencing factors of natural gas and hydrogen in SMX static mixer were studied by combining numerical simulation and experiment.The influence factor such as the number of mixing elements,operating conditions,and hydrogen volume ratio on the mixing performance were analyzed in detail.The results indicate that the mixing behavior of hydrogen and natural gas is mainly attributed to the continuous change of flow state by mixing elements,achieving alternating left and right rotation,and ultimately reaching uniform mixing.The flow loss mainly depends on the flow velocity inside the mixer.Four mixing elements with a flow rate of 10 m/s is a preferred scheme taking into account the performance indexes of pressure loss and mixing uniformity of the SMX static mixer.In addition,increasing the hydrogen volume ratio and lengthening the length of the downstream pipeline of the mixer outlet are conducive to improving the mixing uniformity of hydrogen and natural gas.The hydrogen volume ratio should be determined according to the specific situation of the gas pipeline to determine its reasonable range.
static mixernatural gashydrogenmixing elementmixing uniformityflow losshydrogen volume ratio
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