摘要
【目的】天然气管道掺氢输送易导致终端用气设备在燃烧用火时发生脱火、回火现象,影响设备的火焰稳定性。为明确不同空气系数与掺氢比对典型终端用气设备的燃烧火焰稳定性的影响,通过仿真模拟与实验验证相结合的方法开展研究。【方法】以终端用气设备中的10mm圆形单火孔为研究对象,通过仿真计算了一次空气系数为0.40、0.60、0.65、0.70、0.80条件下,掺氢比为0、3%、5%、10%的脱火工况,以及一次空气系数为0.60、0.65、0.70、0.80条件下,掺氢比为0、3%、5%、10%的回火工况;结合GB/T16411-2023《家用燃气燃烧器具的通用试验方法》,设计了天然气(纯甲烷)掺氢火焰稳定性测试方案进行实验验证。【结果】脱火工况的临界火孔气流速度模拟值与实测值平均相对误差为5.73%,验证了脱火仿真模型的可靠性;回火工况的临界火孔气流速度模拟值与实测值平均相对误差为11.22%,受实验测试条件影响,误差偏大;掺氢比越大,脱火极限越高,越不容易发生脱火现象,掺氢有利于防止脱火;掺氢比越大,回火极限越高,回火倾向越大。【结论】研究成果可为掺氢天然气的工业应用提供借鉴,在实验条件受限的前提下,对终端天然气用户进行掺氢适应性分析时,可借助仿真手段开展针对性分析。对于掺氢比较高的应用场景,建议开展针对性测试,确保终端用气设备的稳定运行。
[Objective]Hydrogen-enriched natural gas(HENG)delivered via pipeline transmission potentially induces blame lifting and flashback during combustion,adversely impacting flame stability at terminal gas equipment.This study aims to investigate the influence of various air coefficients and hydrogen blending ratios on the burning flame stability of typical terminal gas equipment through simulation and experimental verification.[Methods]Focusing on a 10 mm circular single burner port within terminal gas equipment,the simulation calculations were performed respectively under the blame lifting conditions with primary air coefficients of 0.40,0.60,0.65,0.70,and 0.80,alongside hydrogen blending ratios of 0,3%,5%,and 10%,and the flashback conditions with primary air coefficients of 0.60,0.65,0.70,and 0.80,combined with hydrogen blending ratios of 0,3%,5%,and 10%.Subsequent experimental verification was conducted adhering to an experiment plan designed for testing the flame stability of natural gas(pure methane)doped with hydrogen,in alignment with GB/T 16411-2023,titled"Universal test methods of gas burning appliances for domestic use".[Results]The average relative error between the simulated and measured values of the critical gas flow rate at the port stood at 5.73%under the blame lifting scenario,which verified the reliability of the blame lifting simulation model.Conversely,this relative error rose to 11.22%under the flashback scenario,attributed to the influence of the experimental conditions.As the hydrogen blending ratio increased,a corresponding elevation in the blame lifting limit was noted,leading to a reduced probability of blame lifting.Consequently,hydrogen blending was recognized as advantageous for deterring blame lifting occurrences.Furthermore,with an increase in the hydrogen blending ratio,a similar rise was observed in the flashback limit,signifying an elevated tendency of flashback.[Conclusion]The study findings offer a reference for the industrial applications of hydrogen-enriched natural gas.Simulation
作者
刘方
杨宏伟
邓付洁
LIU Fang;YANG Hongwei;DENG Fujie(Technology R&D Center,CNOOC Gas&Power Group Co.Ltd.)
出处
《油气储运》
CAS
北大核心
2024年第7期740-748,共9页
Oil & Gas Storage and Transportation
基金
广东电网科技项目“交流输电线路对油气管道的影响及其规律、标准化防护方案及效果评价研究”,GDKJXM20220860。
关键词
圆形火孔
掺氢比
仿真模拟
脱火
回火
circular burner port
hydrogen blending ratio
simulation
blame lifting
flashback
