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[1]孔莹莹,胡若炜,王赛磊,等.掺氢天然气射流扩散火焰吹熄特性[J].油气储运,2024,43(12):1-11.
　KONG Yingying,HU Ruowei,WANG Sailei,et al.Investigation on blow-out characteristics of turbulent jet diffusion flame[J].Oil & Gas Storage and Transportation,2024,43(12):1-11.

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掺氢天然气射流扩散火焰吹熄特性

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年12期页码: 1-11 栏目: 出版日期: 2024-12-25

Title:: Investigation on blow-out characteristics of turbulent jet diffusion flame

作者:: 孔莹莹; 胡若炜; 王赛磊; 朱建鲁; 韩辉; 段鹏飞; 李玉星; 李璐伶

Author(s):: KONG Yingying; HU Ruowei; WANG Sailei; ZHU Jianlu; GAN Hui; DUAN Pengfei; LI Yuxing; LI Luling

关键词:: 掺氢天然气; 射流火焰; 扩散火焰; 吹熄特性

Keywords:: Hydrogen-blended natural gas; Jet flame; Diffusion flame; Blow-out characteristic

分类号:: TE832；TK91

文献标志码:: A

摘要:: 【目的】将氢气与天然气等气体燃料混合燃烧有助于能源过渡的顺利开展。在接近吹熄极限下向受限空间中注入大量燃料，一旦发生吹熄，燃料与空气混合后在室内积聚，极易达到爆炸极限而引发爆炸。准确预测掺氢天然气吹熄极限对氢能安全应用具有重要意义。【方法】为研究掺氢天然气的吹熄特性，搭建了掺氢天然气吹熄特性实验装置，探索了掺氢天然气射流扩散火焰的吹熄极限，分析了掺氢比及喷嘴直径对掺氢天然气吹熄压力及吹熄速度的影响，实验中天然气掺氢比为0~50%，喷嘴直径为2~10 mm。【结果】与纯天然气相比，掺氢后射流扩散火焰的稳定性更高，扰乱火焰时需要更大的管内压力；同一种燃料在大喷嘴直径工况下吹熄速度更大，这是因为在大喷嘴直径上射流雷诺数及火焰传播速度更大，需要更大的射流速度才能使火焰吹熄。掺氢比越大，通过增大喷嘴直径以获得更大吹熄速度的效果越明显，掺氢比由10%增大至50%时，喷嘴直径由2 mm变化至10 mm时吹熄速度的增大幅度由1.88倍变化至2.81倍。探究了将基于烃类燃料吹熄速度的经验关联式扩展到掺氢火焰的适用性，并基于Damköhler数提出了适用于掺氢天然气的吹熄速度预测模型。【结论】在燃烧器设计中，对于期望获得较大吹熄速度的掺氢燃烧器，可考虑通过适当增加燃烧器的喷嘴直径来扩大安全燃烧范围。研究成果对掺氢天然气火焰稳定性机理理解及其在工业燃烧器设计中的应用具有重要意义。

Abstract:: 【Objective】Hydrogen has attracted attention because of its clean and pollution-free advantages, and it can be burned in natural gas to achieve the purpose of energy transition. A large amount of fuel is injected into the restricted space near the blow-out limit. Once blow-out occurs, the fuel will accumulate in the room after mixing with air, easily reaching the explosion limit and causing an explosion. It is of great significance to accurately predict the blow-out limit of hydrogen-blended natural gas for hydrogen energy safety application.【Methods】In order to study the blow-out characteristics of hydrogen-blended natural gas, an experimental device for blow-off characteristics of hydrogen-blended natural gas was set up, and the blow-off limit of jet flame of hydrogen-blended natural gas was explored through experiments, and the effects of hydrogen content and nozzle diameter on the blow-off pressure and blow-off speed of hydrogen-blended natural gas were analyzed. In the experiment, the hydrogen content of natural gas was considered to be 0%~50%. Nozzle diameter is 2~10mm.【Results】The experimental results show that compared with pure natural gas, the stability of jet diffusion flame after hydrogen mixing is higher, and greater pressure in the tube is required to disturb the flame. The same fuel has a larger blow-out speed in a large nozzle diameter, because it has a larger jet Reynolds number and flame propagation speed on a large nozzle diameter, so a larger jet speed is required to produce flame blow-out. The larger the hydrogen mixing ratio, the more obvious the effect of increasing the nozzle diameter to obtain a larger blow-out speed. When the hydrogen mixing ratio increases from 10% to 50%, the blow-out speed increases from 1.88 times to 2.81 times when the nozzle diameter changes from 2 mm to 10 mm. In addition, the applicability of extending the empirical correlation based on hydrocarbon fuel blow-out rate to hydrogen-blended flame is investigated, and a prediction model for blow-out rate of hydrogen-blended natural gas is proposed based on Damköhler number.【Conclusion】In burner design, for hydrogen-blended burners that expect to obtain a larger blow-out speed, the safe combustion range can be expanded by appropriately increasing the nozzle diameter of the burner. This study is of great significance for understanding the flame stability mechanism of hydrogen-blended natural gas and its application in the design of industrial burners.

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更新日期/Last Update: 2024-09-12