格拉管线顺序输送的冻土温度场模拟

Simulation of the Permafrost Temperature Field along the Golmud-Lhasa Pipeline in Sequential Transportation

基于含相变的瞬态温度场控制方程和水分场扩散方程，考虑温度梯度水分扩散率的影响，建立了水热耦合形式下的等效温度场控制方程。根据风火山地区的冻土资料和气象资料，模拟聚氨酯保温层厚度为60 mm的顺序输送成品油管道6—9月对该地区冻土温度场造成的影响。结果表明，当输送90号汽油和-20号柴油且输送时间在50 h以内，经过该地区管段周围冻土的温升为0~0.5℃，运行1个月后最大温升可达0.8℃，运行2个月后最大温升可达1.1℃。根据模拟的管道中心处地温的变化趋势，7月23日—9月7日可输送冷滤点为-1℃的0号柴油。

Based on the temperature field equation and the moisture field equation, the hydro-thermal coupling model of permafrost temperature is established by taking into consideration the phase change and the water dispersing rate from temperature gradient. On the basis of the permafrost and the meteorological data of the Fenghuoshan area, simulation is conducted to analyze the influence of the batching product pipeline with 60 mm polyurethane thermal insulation layer on the temperature field of permafrost in the area from July to September. Results show that the temperature will rise by 0 to 0.50℃if the pipeline transfers 90# gasoline or-20# diesel for less than 50 hours. The maximum temperature rise will be about 0.8℃if the transportation is kept on for one month. In two months, the maximum temperature rise will be 1.1℃. According to the simulated soil temperature variation trend at the center of the pipeline, the 0# diesel with the cold filtration point of-1℃can be transported between July 23th and September 7th.