A method for evaluating the heating effect of large-scale crude oil floating roof storage tank coils

Abstract

The invention relates to a method for evaluating the heating effect of a large crude oil floating roof storage tank coil, which comprises the following steps of: 1, establishing a heat transfer modelfor dynamically changing atmospheric temperature and solar radiation by taking a large crude oil floating roof storage tank as a research object to obtain an external boundary condition of the storagetank; 2, testing change rules of the density, the heat conductivity coefficient, the viscosity and the specific heat capacity of the crude oil at different temperatures in the storage tank, and obtaining a variable physical property model of the crude oil through a nonlinear regression method; 3, establishing a mathematical model for describing the crude oil heat transfer and flow process in thefloating roof storage tank, and carrying out numerical solution on the model by adopting a finite element method to obtain distribution conditions of crude oil temperature fields in heating coils withdifferent structures in the tank; And 4, establishing a storage tank coil heating effect evaluation index, comparing and analyzing the change rules of the heating rate and the temperature field non-uniformity degree in the heating process of coils with different structures from the perspective of time and space, and preferably selecting a heating coil structure. The method can ensure that the numerical simulation result is consistent with the actual working condition to the maximum extent.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas storage and transportation, in particular to a method for evaluating the heating effect of a large crude oil floating roof storage tank coil. Background technique: [0002] 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, safety accidents such as "tank condensation" will occur. In order to ensure the safe operation of the storage tank, the crude oil in the tank must be heated in a timely manner. Each heating technology has its own advantages and disadvantages, and should be selected and applied according to specific conditions, in combination with oil properties, operation properties, regional and temperature characteristics, and safety factors. Most of the crude oil produced in my country's major oilfields is highly waxy crude oil, with a wax content as high as 15% to 37%. When loading and unload...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating the heating effect of the coil of a large-scale crude oil floating roof storage tank, which is used to solve the problem that the current research on the temperature field of crude oil is not comprehensive, resulting in the evaluation Unreasonable heating effect of large crude oil floating roof storage tank coil

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