How to obtain hydrogen-blended natural gas(HBNG)with high mixing uniformity and accuracy is one of the core issues in HBNG pipeline transportation.The servo-flow hydrogen blending process is commonly used now;however,there is no publicly reported experimental data on servo-flow hydrogen blending in natural gas pipelines.The mixing uniformity and accuracy of hydrogen and natural gas cannot be experimentally verified,which restricts to some extent the development of HBNG pipeline transportation technology.This paper discusses the servo-flow hydrogen blending in natural gas pipelines.Based on an efficient static mixer,three-dimensional online detection of hydrogen component concentration,and bi-feedback servo-flow hydrogen blending with constant hydrogen blending ratio(HBR),an experimental system for servo-flow hydrogen blending in natural gas pipelines is built,and then used at the hydrogen blending flow rate below 100 Nm3/h and the HBR of 5.0%-20.0%.The results show that the mixing uniformity of HBNG obtained by the experimental system for servo-flow hydrogen blending in natural gas pipelines is greater than 95%.If the measurement error is ignored,the absolute blending accuracy is≤1.67%;if the measurement error is considered,the absolute blending accuracy is≤3.30%when the HBR is≥10.0%,and≤1.70%when the HBR is 20.0%.The servo-flow hydrogen blending performance overrides the technical indicators in applicable standards and specifications.Under the same experimental conditions,affected by the accuracy level and measurement range of the hydrogen gas analyzer,the smaller the HBR,the lower the blending accuracy.To reasonably characterize the hydrogen blending accuracy,it is recommended to define the servo-flow hydrogen blending accuracy based on the range of HBR when formulating relevant standards and specifications.The research findings provide important theoretical and technical references for the development of HBNG pipeline transportation technology and the formulation of relevant standards and specifications.
关键词
掺氢天然气/管道输送/掺氢工艺/掺混均匀度/掺氢精度/随动流量/静态混合器/实验研究
Key words
Hydrogen-blended natural gas/Pipeline transportation/Hydrogen blending process/Mixing uniformity/Blending accuracy/Servo-flow/Static mixer/Experimental study
维普
万方数据