HYDROGEN CONCENTRATION DISTRIBUTION IN FLOW OF HYDROGEN BLENDED TO NATURAL GAS IN PIPELINE
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摘要:
天然气掺氢是解决氢气产地与使用地不匹配，进而实现氢气大规模、远距离输送的主要方法。由于氢气的存在会导致在役天然气管道出现氢脆引起安全事故。所以，研究天然气掺氢管路中氢气组分、速度、聚集的规律分析十分必要。本文选用天然气和氢气两种工质，构建T型掺混管路模型和变径管路模型；并基于Fluent软件对T型掺混管路和10种变径掺混管路进行数值模拟研究。结果表明，对于T型掺混管路，在管长是管径35倍处内依然有明显分层，宽度占据1/3管径。对于变径掺混管路，发现变径越靠近掺混中心、直径越窄、高度越低越容易发生氢气富集，氢气摩尔分数最高达到50%~60%，易引起管道的氢脆。研究结果可对天然气掺氢在管道中流动的氢浓度分布和管道变径选取提供参考。
Abstract:Blending hydrogen into natural gas is the primary method to solve the mismatch between the origin and use of hydrogen and realize the large-scale and long-distance transportation for hydrogen. Hydrogen can lead to hydrogen embrittlement in natural gas pipelines and cause safety accidents. Therefore, it is necessary to investigate the regularity analysis of hydrogen composition, velocity, and accumulation in in-service natural gas pipelines. A T-type and a variable diameter type blending pipeline model have been constructed and researched for blending hydrogen in natural gas. The T-type results show that the pipe length of obvious layering and width are 35 times and 1/3 of pipe diameter, respectively. The results of variable diameter have been illustrated that the closer the blending center, the narrower of width and the lower of height with variable diameter can lead to hydrogen enrichment easily. Hydrogen embrittlement has been facile with a maximum hydrogen mole fraction of 50%~60% in blending nature gas pipelines. The results can provide a reference for the blending effect of natural gas with hydrogen and the selection of pipeline diameter.
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图 6 气体掺混后天然气组分摩尔分数云图
Figure 6. Mole fraction distribution of natural gas component after gas blending
图 7 气体掺混后氢气组分摩尔分数云图
Figure 7. Mole fraction distribution of hydrogen component after gas blending
图 8 T型管路掺混后天然气摩尔分数
Figure 8. Percentage distribution of natural gas component with T-type pipeline after gas blending
图 9 T型管路掺混后氢气摩尔分数
Figure 9. Percentage distribution of hydrogen component with T-type pipeline after gas blending
图 11 气体掺混后天然气组分摩尔分数云图
Figure 11. Mole fraction distribution of natural gas component after gas blending
图 12 气体掺混后氢气组分摩尔分数云图
Figure 12. Mole fraction distribution of hydrogen component after gas blending
图 13 掺混后天然气摩尔分数
Figure 13. Percentage distribution of natural gas component after gas blending
图 14 掺混后氢气摩尔分数
Figure 14. Percentage distribution of hydrogen component after gas blending
表 1 网格无关性说明
Table 1. Grid independence specification
Type Grid feature Number of nodes Number of elements Number of iterations Hydrogen mole fraction at outlet/% T-type model sparse 51679 255311 300 4.56 moderate 99004 510457 268 4.68 dense 186225 991794 537 4.91 variable diameter model sparse 52755 260047 318 4.79 moderate 101075 519109 260 4.76 dense 189815 1007159 532 4.79 
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表 2 变径掺混管路几何参数及结果
Table 2. Geometric parameters and results of variable diameter type blending pipeline
NO. s/mm D/mm l/mm x(H2)/% 1 900 160 100 40~50 2 1000 160 100 25~30 3 2000 160 100 25~30 4 3000 160 100 15~20 5 3500 160 100 10~15 6 900 160 200 25~40 7 900 160 50 45~55 8 900 240 100 20~40 9 900 120 100 50~55 10 900 120 50 50~60
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