Light-heat-force integrated coupling calculation method for tower type photo-thermal power station heat absorber
A technology of photothermal power station and calculation method, applied in calculation, computer-aided design, instrument, etc., can solve the problem of unrealized coupling of photothermal calculation, inability to reflect the influence of thermal stress distribution characteristics of heat absorber, and inability to obtain real and reliable heat absorption Stress distribution inside the device, etc.
Active Publication Date: 2021-01-15
XI AN JIAOTONG UNIV
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Problems solved by technology
The following deficiencies still exist in the existing heat absorber stress calculation methods: First, the photothermal calculation has not yet achieved true coupling, such as the assumed cosine distribution of energy flow on the surface of the heat absorber, which cannot reflect the real energy flow density distribution The impact on the thermal stress distribution characteristics of the heat absorber; secondly, the calculation of thermal stress usually uses empirical formulas or analytical solutions, which cannot obtain a true and reliable internal stress distribution of the heat absorber
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[0029] In the following, the present invention will be described in detail by taking the concentrating heat collection system of the Solar Two tower-type molten salt photothermal power station as an example in conjunction with the accompanying drawings:
[0030] Such as figure 1 As shown, the light-heat-mechanical integrated coupling calculation method of the absorber of the tower-type photothermal power station of the present invention is as follows:
[0031] First, according to the studied Solar Two thermal power station, the optical parameters and geometric parameters of the heliostat field and the heat sink are determined.
[0032] Next, mesh the heat sink and give a date, time, and photon count. In this implementation case, the number of grid cells in the axial direction of the heat sink is 60, and the number of grid cells in the circumferential direction is 16. The optical performance of the heat sink is calculated at noon on the vernal equinox.
[0033] Thirdly, Monte...
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A light-heat-force integrated coupling calculation method for a tower type photo-thermal power station heat absorber comprises the following steps that firstly, a Monte Carlo ray tracing method is adopted for building a whole-process optical propagation model of light energy from a tower type photo-thermal power station heliostat field to the heat absorber, and surface energy flow density distribution of the heat absorber is obtained; secondly, a finite volume method is adopted, the convection, radiation and heat conduction processes of the heat absorber are comprehensively considered, a flowing heat transfer model of the heat absorber is established, and temperature distribution of the heat absorber is obtained through calculation with heat absorber surface energy flow distribution obtained in an optical model as a heat boundary condition; and finally, a thermal stress calculation model of the heat absorber is constructed by adopting a finite element method, and thermal stress distribution in the heat absorber are calculated and obtained by taking the heat absorber temperature distribution obtained in the heat absorber flow heat transfer model as a temperature boundary condition.According to the method, the temperature and stress distribution rule of the heat absorber under the real energy flow density can be accurately predicted so as to guide the design and safe and efficient operation of the tower type Light-heat-force station heat absorber.
Description
technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a light-heat-mechanical integrated coupling calculation method for a heat absorber of a tower-type photothermal power station. Background technique [0002] As an important utilization method of renewable energy, concentrating solar thermal power generation has developed rapidly in recent years. According to different concentrating forms, concentrating solar thermal power generation systems currently mainly include four forms: tower type, dish type, trough type and linear Fresnel type. Among them, due to the advantages of large scale, high parameters, and low heat consumption, the tower system is suitable for large-scale grid-connected power generation and has been developed rapidly. The heat absorber is the key equipment for the conversion of light energy to heat energy in tower-type photothermal power plants. There is a very high non-uniform ...
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IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08G06F119/08G06F119/14
CPCG06F30/23G06F30/28G06F2119/08G06F2119/14G06F2111/10G06F2113/08
Inventor 李明佳王文奇何雅玲邱羽李冬刘占斌
Owner XI AN JIAOTONG UNIV