原油浮顶罐盘管加热过程数值模拟与有效利用率研究

发布时间：2018-07-05 07:11

本文选题：原油储罐 + 蒸汽盘管　；参考：《东北石油大学》2015年硕士论文

【摘要】：储油罐需要根据其储存介质、结构形式与生产需求等制定运行方案,油品的储存温度通常根据油品物性及其储存、输转等操作需求确定。对于常温下粘度较大或者凝点较高的油品,较长时间储存时一般都有最低储存温度要求,当油品外输时由于温度不能达到其温度的最低要求,需要对储罐内油品进行加热,以降低其粘度,改善流动性。同时需要对油罐采取各种保温措施,以保证储罐的安全运行。在制定加热方案时,需要确定加热温度和加热负荷等,为此需要准确掌握油罐内油品的温度分布。完善的油罐内油品温度场规律研究能够为制定包括加热方案在内的油罐运行方案提供可靠的依据,从而保障油罐的安全高效运行。本文根据原油储罐传热的途径以及主要特点,运用分步试算法计算罐顶、罐壁以及罐底的传热系数,建立大型原油储罐传热的理论模型;将分步试算法得到的原油储罐传热系数,运用插值的方法代入到推导的储罐节点以及内部热源点的非稳态离散方程中,分析罐内原油温度以及边界温度在不同影响因素下的变化规律;通过计算原油储罐加热过程中蒸汽盘管放出的热量以及被加热油品所吸收的热量,确定储罐的有效利用率,并研究分析采用不同压力蒸汽进行加热时不同储罐液位、外界环境温度、加热终了温度等工况下有效利用率的变化规律。
[Abstract]:Oil storage tanks need to make operation plans according to their storage medium, structure form and production demand, and the storage temperature of oil products is usually determined according to the operational requirements such as the physical properties of oil products and their storage, transportation and transfer. For oil products with high viscosity or high freezing point at room temperature, there is generally a minimum storage temperature requirement when stored for a longer period of time. When the oil is transported out of the oil, it is necessary to heat the oil in the tank because the temperature cannot reach the minimum requirement of its temperature. To reduce its viscosity, improve liquidity. At the same time, it is necessary to take various insulation measures to ensure the safe operation of the tank. It is necessary to determine the heating temperature and heating load when making the heating scheme, so it is necessary to accurately grasp the temperature distribution of the oil products in the oil tank. The perfect research on temperature field of oil products in oil tank can provide reliable basis for making operation plan of oil tank including heating scheme, thus ensuring the safe and efficient operation of oil tank. According to the ways and main characteristics of heat transfer in crude oil storage tank, the heat transfer coefficient of tank top, tank wall and tank bottom is calculated by using step by step algorithm, and the theoretical model of heat transfer of large crude oil tank is established in this paper. The heat transfer coefficient of crude oil tank obtained by stepwise test algorithm is replaced by interpolation method into the unsteady discrete equation of the node of the tank and the internal heat source point. The variation law of crude oil temperature and boundary temperature under different influence factors is analyzed, and the effective utilization ratio of storage tank is determined by calculating the heat released by steam coil unit and the heat absorbed by heated oil product during the heating process of crude oil storage tank. The changes of effective utilization ratio under different conditions such as liquid level, ambient temperature and end temperature of storage tank under different pressure steam heating are studied and analyzed.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE972

【共引文献】