International Scientific Journal

Thermal Science - Online First

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Research on heat transfer characteristics of long-distance pipeline under shutdown and maintenance conditions

When a long-distance pipeline is shut down for maintenance due to corrosion and damage, the process of cooling down and waxing of crude oil in the pipeline is accompanied by complex phase change heat transfer, and it is important to obtain its temperature drop law to reasonably control the shutdown time and formulate restart plan. In this paper, the heat transfer problem of long-distance pipelines under operation and maintenance conditions was studied and refined. Considering the influence of flow and wax precipitation characteristics of crude oil on heat transfer, a multi-field coupled action model was established and analyzed by numerical simulation in combination with the wide-phase interface partitioning method of crude oil. The evolution of the original flow and temperature fields in the pipeline at typical locations of the maintenance pipeline was revealed, and the reasonable maintenance time was proposed based on the change of liquid phase rate. The research in this thesis refined the heat transfer mechanism of the solidified phase change of crude oil for long-distance pipeline shutdown.
PAPER REVISED: 2023-12-19
PAPER ACCEPTED: 2023-12-27
  1. Ying Xu, Xin Nie, et al, Phase-change heat transfer analysis of shutdown overhead pipeline, Case Stud. Therm. Eng. 13 (2019), 3.
  2. Liu Xiaoyan, Xu Ying. The analysis of influential factors on medium temperature distribution during the process of shutdown in overhead pipeline (J). Journal of Engineering Thermophysics, 2012,33(5):847-850.
  3. Dai Zhonghua. Analysis on influencing factors of buried hot oil pipeline(J).Case Studies in Thermal Engineering,2019,16(C).
  4. Ying Xu. Sensitivity analysis of heat dissipation factors in a hot oil pipeline based on orthogonal experiments, Sci. Progr. 10 (2019) 1-19.
  5. Edvik, A.P. Leandro, et al. Effect of the flow shutdown temperature on the gelation of slurry flows in a waxy oil pipeline, Ind. Eng. Chem. Res. 54 (16) (2015) 4455-4459.
  6. Enbin Liu, et al, Simulation on the temperature drop rule of hot oil pipeline, Open Fuels Energy Sci. J. 6 (1) (2013) 55-60.
  7. Wei He,et al. Effects of different water-cooling heat sinks on the cooling system performance in a data center, Energy and Buildings, 2023, 113162.
  8. Bo Yu, Chao Li.Numerical simulation of a buried hot crude oil pipeline under normal operation, J. Eng. Thermophys. 30 (17) (2008) 2670-2679.
  9. Li Hao. Research on safe stopping time and restarting process of hot transmission waxed crude oil pipeline(D). Xi'an Petroleum University, 2020. (MSc. Chinese)
  10. Meng Deli. Numerical simulation study of stopping and restarting of insulated crude oil pipeline (D). Liaoning University of Petrochemical Technology,2019. (MSc. Chinese)
  11. Wang Kai. Calculation of axial temperature drop along hot waxy oil pipeline (J). Pipeline Technique and Equipment,2005(02):8-9.
  12. Wang Haiqin. Calculation of temperature drop along the hot transport pipeline of wax-containing crude oil(J). Oil and Gas Storage and Transportation, 2002(07):9-12+3.
  13. Lixin Wei, QM Lei, et al. Numerical simulation for the heat transfer behavior of oil pipeline during the shutdown and restart process(J). Case Studies in Thermal Engineering, 2018, 12:470-483 .
  14. Weiqiang. Thermal characteristics of waxy crude oil during its static cooling in an overhead pipeline(J). Case Studies in Thermal Engineering,2019,14(C).
  15. Li Chuanxian,Ji Bing. Numerical calculation of the temperature drop of the waxy crude oil pipeline (J). Journal of Petrochemical Higher Education, 2019,32(03):95-102.
  16. Zhang Guozhong. Research on cooling process of buried thermal oil pipeline(J). Oil and Gas Storage and Transportation,2004,23(12): 33-38.
  17. Qinglin Cheng, et al.The study on temperature fifield variation and phase transition law after shutdown of buried waxy crude oil pipelines(J). Case Studies in Thermal Engineering, 2017, 10: 443-454.
  18. XiaoYan Liu, et al. Study on Heat Transfer Performance of Medium in Aerial Hot Oil Pipe for Shutdown(J). Advances in Mechanical Engineering, 2015, 6:571676-571676.
  19. Xu Y, Cheng QL, et al. Effects of crude oil's variable physical properties on temperature distribution in a shutdown pipeline(J). Advances in Mechanical Engineering, 2017, 9(4): 1-9
  20. Chen Xiaoyu. Numerical simulations of temperature field of an oil pipeline when transportation is stopped . (J). Energy Storage Science and Technology, 2014, 3(2): 137-141.
  21. Wang Zicheng, Ma Guiyang. Crude oil property impacts on the rule of shutdown temperature drop for exposed pipeline (J). Journal of Liaoning Shihua University, 2014, 34(5): 28-31.
  22. Guo CS , Nian XB, et al. Analysis of 2D flow and heat transfer modeling in fracture of porous media(J). Journal of Thermal Science, 2017, 26(4): 331-338.
  23. Bhattacharya M, Basak T. A fixed-grid finite element based enthalpy formulation for generalized phase change problems: role of superficial mushy region(J). International Journal of Heat and Mass Transfer, 2002, 45: 4881-4898.
  24. Lu Tao. Heat transfer model and numerical simulation of temperature decreasing and oil solidifying of buried crude pipeline during shutdown (J). Journal of Thermal Science and Technology, 2005, 04: 298-303.
  25. Liu Xiaoyan, et al. Particle melting characteristics of spherical gelled crude oil In pipeline transportation (J). Practice and Understanding of Mathematics, 2019, 15: 123-131.
  26. Wang Min. Numerical calculation research on complex heat transfer law in storage tanks of wax-containing crude oil (D). Beijing: China University of Petroleum, 2017: 13-18.(MSc. Chinese)
  27. Gao DY, Chen ZQ. A thermal lattice Boltzmann model for natural convection in porous media under local thermal non-equilibrium conditions(J). International Journal of Heat and Mass Transfer, 2014, 70: 979-989.
  28. Xu Ying. Study on the heat transfer mechanism of phase change of waxy crude oil based on wide phase interface partitioning(D). Northeast Petroleum University, 2020.(PhD. Chinese)
  29. Wu Guozhong. Research on heat transfer in buried oil pipelines with stop-start (D). Daqing Petroleum Institute, 2007. (PhD. Chinese)