Figure simulation method for unsteady-state heat transfer process of large-sized crude oil floating-roof tank

Abstract

The present invention relates to a figure simulation method for an unsteady-state heat transfer process of a large-sized crude oil floating-roof tank, which solves the problem that existing figure simulation researches cannot comprehensively reflect an influential rule of related factors on a large-sized floating-roof oil tank temperature field. A mathematical model, which is established by particularly adopting a grid generation technology, of an oil product heat transfer process in a large-sized floating-roof crude oil tank can ensure that a figure simulation process coincides with an actual woking condition to the largest extent; and the model is solved by using an iteration method. The method has the characteristics of simplicity, flexibility and high versatility, and is easy to be implemented on the computer; and not only can computing efficiency be ensured, but also time is saved.

Description

technical field [0001] The invention relates to a numerical simulation method, in particular to a numerical simulation method for the unsteady heat transfer process of a large crude oil floating roof storage tank. Background technique [0002] With the increasing demand for crude oil storage, large floating roof oil tanks have become the preferred storage facilities for large-scale crude oil depots due to their technical and economic advantages. During the production and operation of the oil tank, when the temperature of the crude oil in the tank is lower than the wax precipitation point, the waxy crude oil will form an oil condensation layer with a certain thickness and strength on the inner edge surrounded by the floating roof, tank wall and tank bottom due to wax precipitation, which is seriously Accidents such as condensation may occur. Therefore, in order to ensure the safe production of the storage tank, it is necessary to accurately grasp the change law of the temper...

AI Technical Summary

Problems solved by technology

[0003] Numerical simulation method is used to study the change law of the oil tank temperature field, from the traditional empirical formula calculation to the current software simulation solution, the established physical and mathematical model is getting closer to the actual oil tank, and the numerical solution process is becoming more and more complicated accordingly

When using the empirical formula method to calculate the change law of the temperature field of crude oil in the tank, the method of setting the boundary heat transfer coefficient is often adopted with the empirical value method, and the temperature of the crude oil in the tank is considered as a whole for calculation. Although the calculation process is simple and convenient, it will The actual situation has been oversimplified, resulting in limited accuracy of the calculation results, which can only be used as a reference in actual engineering

Existing commercial software, such as CFD numerical simulation software such as Fluent, can be used for numerical simulation of the unsteady heat transfer process of crude oil storage tanks. It has rich physical models, advanced numerical methods and powerful pre- and post-processing functions, but the calculation is time-consuming Many, it can only reflect the temperature drop characteristics of the object in a short period of time, it is not easy to apply to engineering practice, and this kind of software cannot obtain the change law of the overall temperature field

[0004] In summary, the current numerical simulation research on the unsteady heat transfer process of large crude oil floating roof storage tanks has certain limitations, and cannot fully reflect the influence of relevant factors on the temperature field of large floating roof tanks.

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