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针对储罐温度分布影响计量精度而导致计量误差的问题,基于对罐内油品与外界环境传热过程的分析,建立了考虑环境温度、油品物性、罐内油品自然对流及太阳辐射等因素影响的储罐温降模型。以某储备库1#浮顶罐为例,采用Fluent软件对储罐温降模型进行模拟,并将计算温度与实测温度进行对比。进而总结得出油孔纵向平均油温与罐内总体平均油温温差变化的规律:在相同外界条件下,液位越低,温降速率越大;液位越高,存储时间越长,量油孔处的平均油温偏离总体平均油温越大。通过不同工况下的实例计算,量化分析了上述误差的大概范围和变化趋势,对油库的计量盘点具有一定的参考价值。
Aiming at the measurement error caused by the measurement accuracy of the tank temperature distribution, based on the analysis of the heat transfer process between the oil in the tank and the external environment, this paper established a method that considers the ambient temperature, the physical properties of the oil, the natural convection of the tank oil and the solar radiation Factors Affecting Tank Temperature Drop Model. Taking a # 1 floating roof tank of a reserve bank as an example, the Fluent software is used to simulate the temperature drop model of the tank, and the calculated temperature is compared with the measured temperature. And then concluded that the vertical average temperature of oil in the tank and the overall average temperature change of oil temperature law: under the same external conditions, the lower the liquid temperature, the greater the rate of temperature drop; the higher the liquid level, the longer the storage time, the amount of The average oil temperature at the hole deviates from the overall average oil temperature greater. Through the calculation of cases under different working conditions, the approximate range and trend of the above errors are quantified and analyzed, which is of certain reference value for the stocktaking of oil depots.