【Ten Years of Rapid Development in Chemical Processing Equipment】Testing of Performance Parameters for High-Flow, High-Pressure Natural Gas-Based Precise Hydrogen Blending Technology from 2024 to 2025

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Give praise and encouragement to the achievements made in China’s chemical engineering technology and equipment; your participation in discussions is the greatest encouragement**********************【Ten Years of Great Progress in Chemical Engineering Equipment】Regularly updated summary posts – feel free to join the discussions: https://bbs.hcbbs.com/thread-3576046-1-1.html ***************** New breakthroughs! Successful performance testing of high-flow, precision-driven natural gas hydrogen blending equipment On February 17, significant progress was made on the **key research and development project titled “Key Technologies for the Transportation and Application of Pure Hydrogen and Natural Gas Hydrogen Blends in Long-Distance Pipelines”**. A witness meeting was held on-site, with the participation of experts and third-party organizations, to oversee the successful completion of the performance test for the research project on \"high-flow, high-pressure natural gas-based precise hydrogen blending technology\", which is carried out by **China Power Investment Group Science and Technology Research Institute Co., Ltd. (hereinafter referred to as the ‘Research Institute’)**. For this testing effort, the Academia Sinica took the lead in developing a comprehensive testing platform, and strictly followed the **testing standards. With the full-on-site supervision of relevant experts and qualified third-party institutions, the data from on-site sampling tests show that under operating conditions of 6.3 MPa and 2000 Nm3/h, and with volume hydrogen addition ratios of 5%, 10%, 15%, and 20%, the control accuracy of the hydrogen composition is ≤±1%. This test represents the first time in China that performance tests have been conducted on hydrogen blending equipment with a flow rate of over 2000 Nm3/h; it holds significant practical value for research on controlling the hydrogen content in high-pressure long-distance gas pipelines. To address the issues associated with traditional natural gas hydrogen blending equipment, such as a narrow flow control range, poor mixing uniformity, and insufficient pressure resistance, our institute’s project team has overcome numerous technical challenges: ■ Efficient mixing technology: Nozzles and ring-shaped multi-channel mixing structures are employed in these blending devices, and coaxial shear mixers have been developed. The multi-channel ring structure enhances the shear mixing between hydrogen and natural gas, resulting in a 5% improvement in mixing uniformity and a significant reduction in local concentration fluctuations. ■Wide-range precise control: A dual-valve control strategy is employed to achieve flow regulation over a wide range of 10%–100%. Within the hydrogen blending ratio range of 5%–20%, the control accuracy is improved to within ±0.7%, thereby meeting the stringent requirements for dynamic stability control of the hydrogen blending ratio in operational pipelines. ■High-pressure tolerance design: The main body of the equipment can withstand a pressure of 7.25 MPa (1.15 times the design pressure). It has passed airtightness tests (no leaks after 24 hours of pressure retention) as well as tests under extreme operating conditions, ensuring long-term stable operation at 6.3 MPa. In the future, the hydrogen storage and transportation team at the Institute of Advanced Low-Carbon Technologies of the Academia Sinica will continue to conduct in-depth research, continuously improve the performance of related equipment, and promote the large-scale demonstration and application of natural gas hydrogenation technology.