On February 17th, the National Key Research and Development Program project "Key Technologies for Long-Distance Pipeline Transportation and Application of Pure Hydrogen and Hydrogen Blending in Natural Gas" made significant progress. The on-site witness meeting of experts and third-party institutions for the successful completion of the performance index test of the research task "High-Flow and High-Pressure Natural Gas Follow-up Precise Hydrogen Blending Technology" undertaken by the Science and Technology Research Institute of State Power Investment Corporation (hereinafter referred to as "Central Research Institute").
Industry experts, third-party testing institutions and the project team took a group photo
This testing work was led by the Academia Sinica to build a full-process testing platform and was strictly carried out in accordance with national testing standards. The on-site sampling test data, witnessed by relevant experts and qualified third-party institutions throughout the process, shows that under the operating conditions of 6.3MPa and 2000Nm3/h and the set conditions of volume hydrogen blending ratios of 5%, 10%, 15% and 20% respectively, the control accuracy of hydrogen composition of the equipment is ≤±1%. This test is the first of its kind in China to conduct performance index tests on hydrogen blending equipment with a flow rate of over 2000Nm3/h. It holds significant verification significance for the research on the control of hydrogen blending components in high-pressure long-distance gas pipelines.
In response to the problems existing in traditional hydrogen blending equipment for natural gas, such as narrow flow control range, poor uniformity of mixing, and insufficient pressure resistance, our project team has overcome multiple technical difficulties
High-efficiency mixing technology: By applying the nozzle and the annular multi-channel blending structure to hydrogen blending equipment, a coaxial shear blending device was developed. Through the multi-channel annular structure, the shear mixing of hydrogen and natural gas was enhanced, increasing the uniformity of mixing by 5% and significantly reducing local concentration fluctuations.
Wide-range precise control: By adopting a two-stage valve control strategy of large and small, a wide-range flow regulation of 10% to 100% is achieved. Within the hydrogen blending ratio range of 5% to 20%, the control accuracy is improved to within ±0.7%, to meet the strict requirements of in-service pipelines for the dynamic stability control of hydrogen blending ratios.
High-pressure withstand design: The main body of the equipment has a pressure-bearing capacity of 7.25MPa (1.15 times the design pressure), and has passed the air tightness test (zero leakage for 24 hours under pressure maintenance) and extreme working condition verification, ensuring long-term stable operation under 6.3MPa conditions.
Introduction to Equipment Functions
In the future, the hydrogen Storage and Transportation team of the Institute of Advanced Low-Carbon Technology, Academia Sinica, will continue to conduct in-depth research, constantly optimize equipment performance, and promote the large-scale demonstration and application of hydrogen blending technology in natural gas.
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Source: Compiled by Hydrogen Cloud Chain
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