Simulation of Soil Temperature and Pipeline Temperature-Pressure after Shutdown of J-Y Product Pipeline

doi:10.12422/j.issn.1006-396X.2025.05.007

Abstract

Abstract:

During the shutdown period of the J-Y refined oil product pipeline, there is a significant difference between the temperature of the transported oil and the outside soil temperature, which leads to a pressure drop in the pipeline after the shutdown. When the pressure at the high point of the pipeline drops below the saturated vapor pressure, air resistance occurs inside the pipeline, making it impossible to maintain pressure. This further poses a potential threat to the safe operation of the pipeline system. The SPS software was used to establish a pipeline model to simulate the equivalent soil temperature distribution along the pipeline. Through simulation and analysis, the inlet temperature error at the terminal station was effectively corrected, thereby obtaining the average soil temperature along the pipeline and the temperature drop range after shutdown. A fitting equation was utilized to reveal the relationship of equivalent soil temperature change over time. Combined with the pre-pump temperature measurement value and the equivalent soil temperature value obtained from the simulation, a shutdown operation was carried out after the system had been running for a period of time, and the trend of temperature and pressure changes after shutdown was simulated by the SPS model. The analysis shows that the temperature difference between oil and soil shows an exponential relationship with the pressure preservation time after shutdown. If the temperature difference between oil and soil before shutdown is small enough, vaporization is less likely to occur in the whole line after shutdown. If the temperature difference between oil and soil before shutdown is negative, the pressure in the pipe will increase after shutdown.

Key words: Numerical simulation, Soil temperature, Pressure change, Pipeline shut down, Temperature drop

摘要：

在J-Y成品油管道停输期间，输送油品温度与外界土壤温度存在显著差异，导致停输后管内压力下降。当管道高点的压力降至低于饱和蒸汽压时，管内因出现气阻现象无法保压，进而对管道系统的安全运行构成潜在威胁。利用SPS软件建立管道模型，模拟了沿线当量土壤温度分布，通过模拟分析有效修正末站进站温度误差，从而得出管道沿线土壤温度平均值及停输后的温降范围；利用拟合方程揭示了当量土壤温度随时间的变化关系；结合泵前温度测量值与模拟获得的当量土壤温度值，在系统运行一段时间后进行停输操作，并通过SPS软件模拟了停输后温度与压力的变化趋势。结果表明，停输后发生汽化的时间与油品和土壤之间的温差有关；如果停输前油品与土壤的温差足够小，则停输后全线不易发生汽化；如果停输前油品与土壤的温差为负值，则停输后管内压力升高。

关键词: 数值模拟, 土壤温度, 压力变化, 管道停输, 温降

CLC Number:

TE821

Yanchao WEI, Yuerong WU, Dongjun LI, Yuefeng WU, Na KOU, Xiaoping LI, Bingyuan HONG. Simulation of Soil Temperature and Pipeline Temperature-Pressure after Shutdown of J-Y Product Pipeline[J]. Journal of Petrochemical Universities, 2025, 38(5): 54-60.

卫彦超, 吴玥蓉, 李东军, 吴岳峰, 寇娜, 李晓平, 洪炳沅. J-Y成品油管道停输后土壤温度及管道温压模拟[J]. 石油化工高等学校学报, 2025, 38(5): 54-60.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2025.05.007

https://journal.lnpu.edu.cn/syhg/EN/Y2025/V38/I5/54

Figures/Tables 7

Fig.1 The J-Y pipeline simulation model was established in SPS

Fig.2 Relative error in equivalent soil temperature simulation

Fig.3 Equivalent soil temperature changes in the area where the J-Y pipeline is located in 2021

Fig.4 The variation trend of oil temperature at different positions in the pipeline

Fig.5 Pipeline shutdown temperature and pressure simulation results (special)

Fig.6 The relationship between equivalent soil temperature, pipeline high-point oil temperature during shutdown, and the temperature difference between pipeline high-point temperature during vaporization and pipeline high-point oil temperature during shutdown

Fig.7 The relationship between the vaporization time and stabilization time of the pipeline high-point after shutdown and the temperature difference of the pipeline high-point during shutdown

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