Compression factor calculation method of hydrogen-doped natural gas based on regression model
The compression factor regression model is simple in structure,fast in calculation,and easier to program than conventional natural gas compression factor calculation.Hydrogen-doped natural gas was studied compared with other models.Regression models include various forms in cubic and power exponents,such as HY(Hall-Yarborough),RK(Redlich-Kwong)model etc.Each model is applicable to different pressure and temperature ranges.Based on the experimental data of 391 hydrogen-doped natural gas compression factors in literature,the calculation accuracy of 7 regression models under different hydrogen-doped ratios,pressures and temperatures was compared and compared with GERG-2008 equation of state.The pressure range was 0.1-10 MPa,the temperature was 210-350 K,and the hydrogen mole fraction was 0-100％.The comparison results show that the average relative error of RK is 1.36％and HY is 1.46％,both of which are smaller than that of GERG-2008(1.47％).When T＞298.15 K,the error of HY model is the smallest.When T＜298.15 K,the calculation error of RK model is the smallest.The maximum mean relative errors of HY and RK are 2.73％and 1.58％respectively,which is smaller than that of GERG-2008(3.54％).Compared with other regression models,the HY-RK combined regression model is more suitable for the compression factor calculation of hydrogen-doped natural gas.
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