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For enhancing the film stiffness of supercritical CO2 (S-CO2) hydrodynamic dry gas seal and reducing the additional power consumption due to the installation of heater in the seal inlet line, a new structure of S-CO2 hydrostatic-dynamic dry gas seal with the heating of the ring body at the back of the static ring is proposed. Based on the conjugate heat transfer model, the pressure and temperature distribution of dry gas seal were simulated utilizing commercial software Fluent. The steady-state performance and flow field distribution of S-CO2 hydrodynamic seal, hydrostatic seal and hydrostatic-dynamic seal were compared and analyzed, and the flow and heat transfer characteristics and power consumption of S-CO2 hydrostatic-dynamic dry gas seals under different heating modes and heat temperatures were discussed. The results show that the film stiffness of the hydrostatic-dynamic dry gas seal is improved more than doubled compared with the hydrodynamic dry gas seal, while the leakage rate increased significantly by 35% at the same time. The power consumption under ring heating mode is 44% lower than that under direct gas heating mode, leading to better operating economy. It provides a new idea for the structure design and auxiliary system improvement of compressor dry gas seal in S-CO2 power generation system.
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为提高现有超临界二氧化碳(S-CO2)动压型干气密封的气膜刚度和降低因密封进气管路上设置加热器而增加的额外功耗,提出一种基于静环背部环体加热的S-CO2动静压型干气密封新结构。基于共轭热传递模型,采用商用软件Fluent求解密封压力场和温度场,对比分析了S-CO2动压型、静压型和动静压型干气密封的稳态性能和流场分布,探讨了不同加热模式和热源温度下S-CO2动静压型干气密封的流动传热特性和功率消耗。结果表明:在给定参数下,相较于动压型干气密封,动静压型干气密封的气膜刚度增加到2倍以上,不过泄漏率也增加了35%;相较于直接气体加热模式,环体加热模式下的加热功耗降低44%,密封运行经济性更好。这为S-CO2发电系统压缩机端干气密封的结构设计和辅助系统改进提供了新的思路。
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Schematic diagram of supercritical CO2 hydrostatic-dynamic dry gas seal and the heating mode, figureFileSmall=Vl+D9IAcYQXVx0lst7d9mQ==, figureFileBig=3wEK7d3MkYaef1FbC2G8UQ==, tableContent=null), ArticleFig(id=1241137055909073667, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图1, caption=
S-CO2动静压干气密封及其加热模式示意, figureFileSmall=Vl+D9IAcYQXVx0lst7d9mQ==, figureFileBig=3wEK7d3MkYaef1FbC2G8UQ==, tableContent=null), ArticleFig(id=1241137056034902797, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.2, caption=
Schematic diagram of surface structure and parameter definition of hydrostatic-dynamic dry gas seal, figureFileSmall=uuTWf5Qv5n1b9X88XRIbIw==, figureFileBig=b3dtAQUEto3JJ+THL+HtPQ==, tableContent=null), ArticleFig(id=1241137056139760403, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图2, caption=
动静压干气密封端面结构及其参数定义示意, figureFileSmall=uuTWf5Qv5n1b9X88XRIbIw==, figureFileBig=b3dtAQUEto3JJ+THL+HtPQ==, tableContent=null), ArticleFig(id=1241137056290755357, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.3, caption=
Grid meshing of solid domain and fluid domain of hydrostatic-dynamic dry gas seal, figureFileSmall=xvONoUDf6M4B+JvPtmqAsg==, figureFileBig=AdYz8LGnpCRU3CdaTR2a3w==, tableContent=null), ArticleFig(id=1241137056391418660, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图3, caption=
动静压干气密封固体域与流体域网格划分, figureFileSmall=xvONoUDf6M4B+JvPtmqAsg==, figureFileBig=AdYz8LGnpCRU3CdaTR2a3w==, tableContent=null), ArticleFig(id=1241137056534025008, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.4, caption=
Thermal boundary condition for dry gas seals with different heating modes, figureFileSmall=m7d5fKxnKScLJpaeX4/gpw==, figureFileBig=WvxGS6JnIwQa365RaycKQw==, tableContent=null), ArticleFig(id=1241137056664048442, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图4, caption=
2种不同加热模式下动静环传热边界, figureFileSmall=m7d5fKxnKScLJpaeX4/gpw==, figureFileBig=WvxGS6JnIwQa365RaycKQw==, tableContent=null), ArticleFig(id=1241137056789877566, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.5, caption=
Flow chart of flow field parameter calculation of dry gas seal, figureFileSmall=wokmyw8AcOAquA7m3xpLJw==, figureFileBig=0t2+vzd4WH6sr1J0p7MG0g==, tableContent=null), ArticleFig(id=1241137056882152263, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图5, caption=
干气密封间隙流场参数计算流程, figureFileSmall=wokmyw8AcOAquA7m3xpLJw==, figureFileBig=0t2+vzd4WH6sr1J0p7MG0g==, tableContent=null), ArticleFig(id=1241137056991204174, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.6, caption=
Gas pressure distribution of the three different types of dry gas seals, figureFileSmall=/cQFQn0Sq6ezDHLrSz7/LA==, figureFileBig=5pMc9PFGmxBsnrY8kEFQaA==, tableContent=null), ArticleFig(id=1241137057083478869, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图6, caption=
3种结构干气密封气膜压力分布, figureFileSmall=/cQFQn0Sq6ezDHLrSz7/LA==, figureFileBig=5pMc9PFGmxBsnrY8kEFQaA==, tableContent=null), ArticleFig(id=1241137057196725086, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.7, caption=
Flow velocity distribution in sealing gap of the three different types of dry gas seals, figureFileSmall=2KsVMGza6iOjfKXOi+Kidg==, figureFileBig=3k8PlHa+/jY7fKwStxbizw==, tableContent=null), ArticleFig(id=1241137057301582694, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图7, caption=
3种结构干气密封密封间隙流速分布, figureFileSmall=2KsVMGza6iOjfKXOi+Kidg==, figureFileBig=3k8PlHa+/jY7fKwStxbizw==, tableContent=null), ArticleFig(id=1241137057444189037, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.8, caption=
Gas temperature distribution of the three different types of dry gas seals, figureFileSmall=sqyUmZC//Xgj8hdSYFJshw==, figureFileBig=D3lhMbBu8aU6nk4diQSgog==, tableContent=null), ArticleFig(id=1241137057603572596, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图8, caption=
3种结构干气密封气膜温度分布, figureFileSmall=sqyUmZC//Xgj8hdSYFJshw==, figureFileBig=D3lhMbBu8aU6nk4diQSgog==, tableContent=null), ArticleFig(id=1241137057792316282, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.9, caption=
Gas pressure and temperature distribution in the radial direction of the three types of dry gas seals, figureFileSmall=BtV0AdIUxGB98qRMYbpLQw==, figureFileBig=hWAfg3r2dHR+zN4oT9wHwQ==, tableContent=null), ArticleFig(id=1241137059235156864, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图9, caption=
3种结构干气密封气膜压力和温度径向分布, figureFileSmall=BtV0AdIUxGB98qRMYbpLQw==, figureFileBig=hWAfg3r2dHR+zN4oT9wHwQ==, tableContent=null), ArticleFig(id=1241137059344208775, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.10, caption=
Radial temperature distribution of seals under different heating modes and heating temperature, figureFileSmall=U4iY7dHgYUQeQey4mDjUJQ==, figureFileBig=uwYqFId4mgG7ALEh9luFdA==, tableContent=null), ArticleFig(id=1241137059419706250, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图10, caption=
不同加热模式和热源温度下密封径向温度分布, figureFileSmall=U4iY7dHgYUQeQey4mDjUJQ==, figureFileBig=uwYqFId4mgG7ALEh9luFdA==, tableContent=null), ArticleFig(id=1241137059528758164, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.11, caption=
Opening force and leakage rate of seals under different heating modes and heating temperature, figureFileSmall=gfZuDhqeob6WBwFFLldRHw==, figureFileBig=B4UzmT1gBSap8++kVIzldA==, tableContent=null), ArticleFig(id=1241137059595867032, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图11, caption=
不同加热模式和热源温度下密封开启力和泄漏率, figureFileSmall=gfZuDhqeob6WBwFFLldRHw==, figureFileBig=B4UzmT1gBSap8++kVIzldA==, tableContent=null), ArticleFig(id=1241137059688141726, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.12, caption=
Radial pressure differential distribution of seals under different heating modes and heat temperature, figureFileSmall=NteWJ1+mdAo99PrlEeuubw==, figureFileBig=ppusOQ5GVyEiMvlaeZbHTA==, tableContent=null), ArticleFig(id=1241137059776222115, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图12, caption=
不同加热模式和热源温度下密封压差径向分布, figureFileSmall=NteWJ1+mdAo99PrlEeuubw==, figureFileBig=ppusOQ5GVyEiMvlaeZbHTA==, tableContent=null), ArticleFig(id=1241137059876885416, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.13, caption=
Inlet gas flow rate of seals under different heating modes and heat temperature, figureFileSmall=lWvFIrhvPwWlD5bQwC20ng==, figureFileBig=QhJ3hoymsQn2LAwWJK+7hQ==, tableContent=null), ArticleFig(id=1241137059969160109, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图13, caption=
不同加热模式和热源温度下密封进气流量, figureFileSmall=lWvFIrhvPwWlD5bQwC20ng==, figureFileBig=QhJ3hoymsQn2LAwWJK+7hQ==, tableContent=null), ArticleFig(id=1241137060078212022, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.14, caption=
Density distribution of sealing medium under different heating modes and heating temperature, figureFileSmall=xXo51K1Z0c6MRiMkuu8BmQ==, figureFileBig=zVrqWZ912fJhj7m4BP4DBw==, tableContent=null), ArticleFig(id=1241137060187263934, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图14, caption=
不同加热模式和热源温度下密封介质密度分布, figureFileSmall=xXo51K1Z0c6MRiMkuu8BmQ==, figureFileBig=zVrqWZ912fJhj7m4BP4DBw==, tableContent=null), ArticleFig(id=1241137060296315847, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Fig.15, caption=
Flow velocity distribution of sealing medium under different heating modes and heating temperature, figureFileSmall=+EN228VPsaFvUgWlmsdpGw==, figureFileBig=6mLVQM9vEk1wuQMhH+k94Q==, tableContent=null), ArticleFig(id=1241137060409562061, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=图15, caption=
不同加热模式和热源温度下密封介质流速分布, figureFileSmall=+EN228VPsaFvUgWlmsdpGw==, figureFileBig=6mLVQM9vEk1wuQMhH+k94Q==, tableContent=null), ArticleFig(id=1241137060497642449, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Tab.1, caption=
Convective heat transfer coefficient of seal ring thermal boundary under different heating temperatures
, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度T/K | 表面传热系数/(W·m–2·K–1) |
|---|
| 动环外周 | 静环外周 | 静环背面 |
|---|
| 360 | 8 203.13 | 2 881.26 | 166.27 |
| 370 | 7 737.82 | 2 680.74 | 154.70 |
| 380 | 7 387.74 | 2 528.14 | 145.89 |
| 390 | 7 113.64 | 2 407.14 | 138.91 |
| 400 | 6 893.23 | 2 308.52 | 133.22 |
), ArticleFig(id=1241137060644443098, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=表1, caption=
不同加热温度下密封热边界表面传热系数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 温度T/K | 表面传热系数/(W·m–2·K–1) |
|---|
| 动环外周 | 静环外周 | 静环背面 |
|---|
| 360 | 8 203.13 | 2 881.26 | 166.27 |
| 370 | 7 737.82 | 2 680.74 | 154.70 |
| 380 | 7 387.74 | 2 528.14 | 145.89 |
| 390 | 7 113.64 | 2 407.14 | 138.91 |
| 400 | 6 893.23 | 2 308.52 | 133.22 |
), ArticleFig(id=1241137060749300707, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Tab.2, caption=
Initial parameters adopted in the numerical calculation
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 | 项目 | 数值 |
|---|
| 外腔介质压力pout/MPa | 8 | 槽/孔数Ng | 12 |
| 转速n/(r·min–1) | 10 000 | 螺旋槽深度hg/μm | 5 |
| 热源温度Th/K | 360~400 | 螺旋角α/(°) | 15 |
| 气膜厚度h0/μm | 6 | 周向槽宽比β | 0.5 |
| 弹性模量E/GPa | 386 | 均压槽深度ht/μm | 50 |
| 泊松比ν | 0.14 | 节流孔直径d/mm | 0.20 |
| 导热系数k/(W·m–1·K–1) | 57 | 均压槽外径re2/mm | 66.00 |
| 比热容cp/(J·kg–1·K–1) | 710 | 均压槽中径rt/mm | 65.00 |
| 密封端面外径ro/mm | 77.78 | 均压槽内径re1/mm | 64.00 |
| 密封端面内径ri/mm | 58.42 | 密封腔间隙δ/mm | 20.00 |
| 槽根半径rg/mm | 69.00 | | |
), ArticleFig(id=1241137060870935532, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=表2, caption=
数值计算中所采用的初始计算参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 数值 | 项目 | 数值 |
|---|
| 外腔介质压力pout/MPa | 8 | 槽/孔数Ng | 12 |
| 转速n/(r·min–1) | 10 000 | 螺旋槽深度hg/μm | 5 |
| 热源温度Th/K | 360~400 | 螺旋角α/(°) | 15 |
| 气膜厚度h0/μm | 6 | 周向槽宽比β | 0.5 |
| 弹性模量E/GPa | 386 | 均压槽深度ht/μm | 50 |
| 泊松比ν | 0.14 | 节流孔直径d/mm | 0.20 |
| 导热系数k/(W·m–1·K–1) | 57 | 均压槽外径re2/mm | 66.00 |
| 比热容cp/(J·kg–1·K–1) | 710 | 均压槽中径rt/mm | 65.00 |
| 密封端面外径ro/mm | 77.78 | 均压槽内径re1/mm | 64.00 |
| 密封端面内径ri/mm | 58.42 | 密封腔间隙δ/mm | 20.00 |
| 槽根半径rg/mm | 69.00 | | |
), ArticleFig(id=1241137060950627315, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Tab.3, caption=
Steady performance of supercritical CO2 dry gas seals with three different structures
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 动压型 | 静压型 | 动静压型 |
|---|
| 开启力Fo/kN | 49.79 | 51.45 | 54.12 |
| 气膜刚度kz/(kN·μm–1) | 0.65 | 0.84 | 1.67 |
| 泄漏率q/(g·s–1) | 7.72 | 10.00 | 10.39 |
| 出口温度Tout/K | 323.03 | 318.84 | 320.93 |
), ArticleFig(id=1241137061055484918, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=表3, caption=
3种结构S-CO2干气密封稳态性能
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | 动压型 | 静压型 | 动静压型 |
|---|
| 开启力Fo/kN | 49.79 | 51.45 | 54.12 |
| 气膜刚度kz/(kN·μm–1) | 0.65 | 0.84 | 1.67 |
| 泄漏率q/(g·s–1) | 7.72 | 10.00 | 10.39 |
| 出口温度Tout/K | 323.03 | 318.84 | 320.93 |
), ArticleFig(id=1241137061206479867, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=EN, label=Tab.4, caption=
Sealing performance and power consumption at different heating temperature and heating modes
, figureFileSmall=null, figureFileBig=null, tableContent=
| 加热模式 | 项目 | 热源温度Th/K |
|---|
| 360 | 380 | 400 |
|---|
| 气体加热 | 开启力Fo/kN | 54.12 | 54.06 | 54.04 |
| 泄漏率q/(g·s–1) | 10.50 | 9.93 | 9.34 |
| 出口温度Tout/K | 323 | 343 | 360 |
| 加热功耗Qgas/W | 0 | 216.0 | 395.8 |
| 环体加热 | 开启力Fo/kN | 54.12 | 54.23 | 54.34 |
| 泄漏率q/(g·s–1) | 10.39 | 9.95 | 9.46 |
| 出口温度Tout/K | 321 | 344 | 362 |
| 加热功耗Qring/W | 2.3 | 112.3 | 221.1 |
), ArticleFig(id=1241137061386833923, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222513213376287463, language=CN, label=表4, caption=
不同热源温度和加热模式下密封性能和功耗
, figureFileSmall=null, figureFileBig=null, tableContent=
| 加热模式 | 项目 | 热源温度Th/K |
|---|
| 360 | 380 | 400 |
|---|
| 气体加热 | 开启力Fo/kN | 54.12 | 54.06 | 54.04 |
| 泄漏率q/(g·s–1) | 10.50 | 9.93 | 9.34 |
| 出口温度Tout/K | 323 | 343 | 360 |
| 加热功耗Qgas/W | 0 | 216.0 | 395.8 |
| 环体加热 | 开启力Fo/kN | 54.12 | 54.23 | 54.34 |
| 泄漏率q/(g·s–1) | 10.39 | 9.95 | 9.46 |
| 出口温度Tout/K | 321 | 344 | 362 |
| 加热功耗Qring/W | 2.3 | 112.3 | 221.1 |
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