Simulation and analysis for pipeline transportation characteristics of hydrogen-enriched compressed natural gas
Hydrogen-enriched compressed natural gas(HCNG)is a potential carrier for transporting hydrogen over long distances with existing natural gas pipelines.Mixing hydrogen with natural gas brings apparent changes of its physical properties,which affects the transporting characteristics in pipeline.In this calculation,the BWRS equation is replaced by a fast method formula to improve the calculation efficiency.The flow and heat transfer process of HCNG is modeled,and the operating characteristics of the HCNG pipeline are analyzed.According to the calculated results,the values of viscosity,density,calorific value and Joule-Thomson effect coefficient of HCNG decrease with hydrogen adding,but the specific heat capacity and the compression factor increase;the transporting volume flow rate increases with hydrogen adding,and the transporting pressure drop and the pipeline storage decrease;the energy flow rate decreases with low hydrogen mixing rate and then slightly increases with the large hydrogen mixing ratio.When the energy flow rate is constant,the outlet pressure of the pipeline first decreases and then slightly increases with the hydrogen ratio increasing;the addition of hydrogen weakens the temperature decrease caused by the pressure drop of long-distance pipeline.
万方数据
维普
