关键词: 数模计算, 水下油罐, 传热分析, 混凝土, 大庆原油, 高凝原油, 散热量, 油水界面, 表观导热系数, 轴向温度分布

Abstract: In this paper heat transfer analysis of water flooding technology in cement underwater tank for storage of high pour point crude oil is described.Heat transfer process in this system is relatively complex.Based on the analysis of the temperature distribution and its variation in the oil tank,a"model of heat transfer in separate regions"is established.The temperature distribution and heat flux of the unsteady state heat transfer are simulated by a finite difference mathematical model.The apparent coefficient of conductivity k_o'of high pour point crude oil in the tank is 0.325T_i^1/2 The"critical temperature of conductivity" of the oil T_x is 41℃.The temperature distribution and its variation with time in the tank are calculated,and the deviation of calcculated and measured temperatures at the junction points is±1℃.Thus the model can reasonably describe the heat transfer characteristics of the temperatures of the oil,sea water,oil water interface,wall of the tank and its surroundings.Mathematical simulation also gives the variation of heat fluxs of hot oil across the tank cover,tank wall and oil water interface with time.The heat flux of hot oil across the oil water interface accounts for 2.1～3.1% of the total heat flux of oil.Thus the water flooding technology in the underwater tank for storage of high pour point crude oil is practical from the view point of heat transfer.