入口压力对天然气超声速液化特性的影响

边江; 曹学文; 杨文; 于洪喜; 尹鹏博

doi:10.11858/gywlxb.20170639

入口压力对天然气超声速液化特性的影响

doi: 10.11858/gywlxb.20170639

边江^1,,
曹学文^1,*, ,,
杨文²,
于洪喜³,
尹鹏博¹

1.
中国石油大学(华东)储运与建筑工程学院, 山东青岛 266580
2.
中国石化销售有限公司华南分公司, 广东广州 510620
3.
中国石化新疆煤制气外输管道有限责任公司湖广分公司, 湖南长沙 410016

基金项目:

国家重点研发计划专项 2016YFC0802301

国家自然科学基金 51274232

国家自然科学基金 51406240

山东省自然科学基金 ZR2014EEQ003

详细信息

作者简介:
边江(1992-), 男, 博士研究生, 主要从事天然气处理与加工技术研究.E-mail:bianjiang868@163.com

通讯作者:
曹学文(1966-), 男, 教授, 博士生导师, 主要从事天然气处理与加工、油气水多相流理论及应用、海底管道完整性管理等研究.E-mail:caoxw@upc.edu.cn

中图分类号: TE642
计量
- 文章访问数: 8045
- HTML全文浏览量: 3313
- PDF下载量: 506
出版历程
- 收稿日期: 2017-09-09
- 修回日期: 2017-10-25

Influence of Inlet Pressure on Supersonic Liquefaction of Natural Gas Mixtures

BIAN Jiang^1
,,
CAO Xuewen^{1,*
, ,},
YANG Wen²,
YU Hongxi³,
YIN Pengbo¹

1.
College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China
2.
South China Branch, Sinopec Sales Co., Ltd., Guangzhou 510620, China
3.
Huguang Branch, Sinopec Xinjiang Coal Gas Pipeline Co., Ltd., Changsha 410016, China

摘要

摘要: 为研究入口压力对天然气混合物超声速液化特性的影响规律，建立了三维双组分天然气混合物超声速凝结流动数学模型，对Laval喷管内双组分混合物凝结流动进行了数值模拟，得出了沿Laval喷管轴向的参数分布，通过开展双可凝组分气体凝结相变实验，对比发现数值模拟与实验结果基本一致，说明了所建立的数学模型及计算方法的正确性。还研究了入口压力对甲烷-乙烷混合物超声速液化特性的影响，结果表明，保持Laval喷管入口温度及组成不变，增大入口压力，混合气体成核位置前移，成核率、平均液滴半径、液相质量分数均随之增大，即入口压力越大，混合气体在Laval喷管内越易发生凝结，在实际生产中可以通过调节入口压力来促进天然气的凝结，提高Laval喷管的液化效率。
- Laval喷管 /
- 甲烷-乙烷 /
- 入口压力 /
- 液化 /
- 成核
Abstract: In this paper, to find out about how the inlet pressure influences the supersonic liquefaction of natural gas mixtures, we established a three-dimensional mathematical model for the supersonic condensation flow of the methane-ethane mixture gas, obtained the axial parameters along the Laval nozzle, and conducted experiments to verify the gas condensate phase transition of double condensable components.It was found that the numerical simulation is in good agreement with the experimental results, thereby proving the mathematical model and the calculation method as correct.We also investigated the influences of the inlet pressure on the supersonic liquefaction of methane-ethane mixtures.The results indicate that, when the temperature and composition of the Laval nozzle inlet remain the same, the nucleation position of the mixed gas moves forward, the nucleation rate, the mean droplet radius and the liquid mass fraction all increase with the increase of the inlet pressure.The greater the inlet pressure, the more apt for the condensation of the gas mixture in the Laval nozzle to occur.In the actual production, the condensation of natural gas mixtures can be promoted by adjusting the inlet pressure, and the liquefaction efficiency of the Laval nozzle will be improved.
- Laval nozzle /
- methane-ethane /
- inlet pressure /
- liquefaction /
- nucleation

HTML全文

图 1 Laval喷管三维结构

Figure 1. Structure of Laval nozzle

下载: 全尺寸图片幻灯片

图 2 Laval喷管沿程压力分布数据对比

Figure 2. Comparison of pressure distribution data in Laval nozzle

下载: 全尺寸图片幻灯片

图 3 Laval喷管内气体压力分布

Figure 3. Gas pressure distribution in Laval nozzle

下载: 全尺寸图片幻灯片

图 4 Laval喷管内气体温度分布

Figure 4. Gas temperature distribution in Laval nozzle

下载: 全尺寸图片幻灯片

图 5 Laval喷管内成核率分布

Figure 5. Nucleation rate distribution in Laval nozzle

下载: 全尺寸图片幻灯片

图 6 Laval喷管内液滴半径分布

Figure 6. Droplet radius distribution in Laval nozzle

下载: 全尺寸图片幻灯片

图 7 Laval喷管内液滴生长率分布

Figure 7. Droplet growth rate distribution in Laval nozzle

下载: 全尺寸图片幻灯片

图 8 Laval喷管内液相质量分数分布

Figure 8. Liquid mass fraction distribution in Laval nozzle

下载: 全尺寸图片幻灯片

表 1 Laval喷管各部分参数

Table 1. Parameters of Laval nozzle

L₀/mm r₁/mm L₁/mm r_cr/mm L₂/mm r₂/mm

50.00 20.00 56.01 2.50 71.28 6.15

下载: 导出CSV

参考文献(18)

[1]	SHI G H, JING Y Y, WANG S L, et al.Development status of liquefied natural gas industry in China[J].Energy Policy, 2010, 38(11):7457-7465. doi: 10.1016/j.enpol.2010.08.032
[2]	LIN W, ZHANG N, GU A.LNG (liquefied natural gas):a necessary part in China's future energy infrastructure[J].Energy, 2010, 35(11):4383-4391. doi: 10.1016/j.energy.2009.04.036
[3]	杨文, 曹学文, 孙丽, 等.天然气液化技术研究现状及进展[J].天然气化工(C₁化学与化工), 2015, 40(3):88-93. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=trqhg201503021 YANG W, CAO X W, SUN L, et al.Natural gas liquefaction technology research status and progress[J].Natural Gas Chemical Industry, 2015, 40(3):88-93. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=trqhg201503021
[4]	YANG Y, WALTHER J H, YAN Y, et al.CFD modelling of condensation process of water vapor in supersonic flows[J].Applied Thermal Engineering, 2017, 115:1357-1362. doi: 10.1016/j.applthermaleng.2017.01.047
[5]	SUN W J, CAO X, YANG W, et al.Numerical simulation of CO₂ condensation process from CH₄-CO₂ binary gas mixture in supersonic nozzles[J].Separation and Purification Technology, 2017, 118(29):458-470.
[6]	WEN C, CAO X, YANG Y, et al.Numerical simulation of natural gas flows in diffusers for supersonic separators[J].Energy, 2012, 37(1):195-200. https://www.sciencedirect.com/science/article/pii/S036054421100778X
[7]	杨文, 曹学文.Laval喷管设计及在天然气液化中的应用研究[J].西安石油大学学报(自然科学版), 2015, 30(2):75-79. http://www.cnki.com.cn/Article/CJFDTotal-XASY201502014.htm YANG W, CAO X W.Design of Laval nozzle and its application in liquefaction of natural gas[J].Journal of Xi'an Shiyou University (Natural Science Edition), 2015, 30(2):75-79. http://www.cnki.com.cn/Article/CJFDTotal-XASY201502014.htm
[8]	CAO X, YANG W.Numerical simulation of binary-gas condensation characteristics in supersonic nozzles[J].Journal of Natural Gas Science and Engineering, 2015, 25(4):197-206. https://www.sciencedirect.com/science/article/pii/S1875510015001912
[9]	BIAN J, JIANG W M, TENG L, et al.Structure improvements and numerical simulation of supersonic separators[J].Chemical Engineering & Processing, 2016, 110:214-219. https://www.sciencedirect.com/science/article/pii/S0255270116301738
[10]	LI Z C, SUN H, GUO B L, et al.A design method of supersonic separator used in natural gas liquefaction process[J].Advanced Materials Research, 2013, 609:1309-1313. https://www.scientific.net/AMR.608-609.1309
[11]	刘杨, 边江, 郭晓明, 等.Laval喷管结构对流动特性和制冷性能的影响[J].低温与超导, 2016, 44(12):67-71, 76. http://mall.cnki.net/magazine/Article/DWYC201612014.htm LIU Y, BIAN J, GUO X M, et al.Effect of Laval nozzle structure on the flow characteristic and refrigeration performance[J].Cryogenics & Superconductivity, 2016, 44(12):67-71, 76. http://mall.cnki.net/magazine/Article/DWYC201612014.htm
[12]	杨文, 曹学文, 徐晓婷, 等.高速膨胀天然气凝结流动特性[J].石油学报(石油加工), 2016, 32(1):73-81. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syxb-syjg201601011 YANG W, CAO X W, XU X T, et al.Flow and condensation characteristics of natural gas with high speed expansion[J].Acta Petrolei Sinica (Petroleum Processing Section), 2016, 32(1):73-81. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=syxb-syjg201601011
[13]	JASSIM E, ABDI M A, MUZYCHKA Y.Computational fluid dynamics study for flow of natural gas through high-pressure supersonic nozzles (Part 1):real gas effects and shockwave[J].Petroleum Science and Technology, 2008, 26(15):1757-1772. doi: 10.1080/10916460701287847
[14]	JASSIM E, ABDI M A, MUZYCHKA Y.Computational fluid dynamics study for flow of natural gas through high-pressure supersonic nozzles (Part 2):nozzle geometry and vorticity[J].Petroleum Science and Technology, 2008, 26(15):1773-1785. doi: 10.1080/10916460701304410
[15]	杨文, 侯志强, 陈鹏, 等.双组分气体自发凝结成核模型修正[J].石油学报(石油加工), 2017, 33(2):273-280. http://d.old.wanfangdata.com.cn/Periodical/syxb-syjg201702012 YANG W, HOU Z Q, CHEN P, et al.Modification of models for binary component vapor spontaneous nucleation[J].Acta Petrolei Sinica (Petroleum Processing Section), 2017, 33(2):273-280. http://d.old.wanfangdata.com.cn/Periodical/syxb-syjg201702012
[16]	JIANG W M, BIAN J, LIU Y, et al.Investigation of flow characteristics and the condensation mechanism of ternary mixture in a supersonic nozzle[J].Journal of Natural Gas Science & Engineering, 2016, 34:1054-1061. https://www.sciencedirect.com/science/article/pii/S1875510016305479
[17]	JIANG W M, LIU Z L, LIU H W, et al.Influences of friction drag on spontaneous condensation in water vapor supersonic flows[J].Science in China Series E:Technological Sciences, 2009, 52(9):2653-2659. doi: 10.1007/s11431-009-0121-5
[18]	SHOOSHTARI S H R, SHAHSAVAND A.Reliable prediction of condensation rates for purification of natural gas via supersonic separators[J].Separation and Purification Technology, 2013, 116(37):458-470. https://www.sciencedirect.com/science/article/pii/S1383586613003663