注氮参数对输气管道氮气置换的影响及其数值分析
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摘要
如果氮气置换期间注氮参数控制不当,将给管道运行带来安全隐患。为明确影响置换效果的因素,结合实例,详细探讨了影响管道置换的内在因素。为明确注氮参数的数值关系,基于气体对流-扩散理论,建立了混气段数学模型,推导出混气长度的数学表达式。结合模拟数据数值分析,通过非线性拟合曲线对模型进行验证,并明确了安全氮气置换过程中氮气浓度、温度及注氮速度的控制标准。
Inappropriate control of nitrogen injection parameters during nitrogen replacement can bring safety hazards to the operation of pipelines. In order to clarify the factors affecting the displacement effect, combined with examples, the intrinsic factors affecting pipeline replacement were discussed in detail. In order to clarify the numerical relationship of nitrogen injection parameters,based on the gas convection-diffusion theory, a mathematical model of the gas mixing section was established, and the mathematical expression of the gas mixing length was derived. Combined with the numerical analysis of the simulation data, the model was verified by the nonlinear fitting curve, and the control standards of nitrogen concentration, temperature and nitrogen injection rate during the safe nitrogen replacement process were clarified.
Inappropriate control of nitrogen injection parameters during nitrogen replacement can bring safety hazards to the operation of pipelines. In order to clarify the factors affecting the displacement effect, combined with examples, the intrinsic factors affecting pipeline replacement were discussed in detail. In order to clarify the numerical relationship of nitrogen injection parameters,based on the gas convection-diffusion theory, a mathematical model of the gas mixing section was established, and the mathematical expression of the gas mixing length was derived. Combined with the numerical analysis of the simulation data, the model was verified by the nonlinear fitting curve, and the control standards of nitrogen concentration, temperature and nitrogen injection rate during the safe nitrogen replacement process were clarified.
引文
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[2]谭力文,敬加强,戴志向,等.天然气管道氮气置换技术研究[J].管道技术与设备,2007,3(3):25-28.
[3]Kestin J.The corresponding state principle on transport proper ties of noble gas[J].Physical,1972,58:165-171.
[4]Kestin J.The transport properties of pure noble gas,binary mix ture gases,trimixture gases[J].Phys Chem Ref Data,1984,58(13):229-236.
[5]崔茂林,吴长春.输气管道投产中氮气置换的原则及技巧[J].天然气工业,2015,32(2):81-86.
[6]唐善华,张帆.靖边-上海输气管道的投产置换[J].油气储运,2005,24(5):13-15.
[7]刘雪梅,谢英.输气管道气体置换方案的比较及应用[J].油气储运,2008,27(1):47-50.
[8]付春丽.输气管道氮气置换混气长度的影响因素[J].油气储运,2011,30(2):94-96.
[9]白忠涛,王福文,董文章.长输天然气管道氮气置换技术[J].油气田地面工程,2008,27(8):42-43.