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Radiant energy density simulation method for focusing heliostats in tower solar thermal power plants

A technology of tower solar energy and simulation method, which is applied in the field of radiant energy density simulation of focusing heliostats, and can solve the problems of low ray tracing calculation efficiency, peak instability, and low accuracy of analytical model simulation

Active Publication Date: 2020-12-11
ZHEJIANG UNIV
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Problems solved by technology

[0008] The shortcomings of the current simulation method mainly lie in: low ray tracing calculation efficiency, unstable peak value; low simulation accuracy due to simplification of the analytical model

Method used

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  • Radiant energy density simulation method for focusing heliostats in tower solar thermal power plants
  • Radiant energy density simulation method for focusing heliostats in tower solar thermal power plants
  • Radiant energy density simulation method for focusing heliostats in tower solar thermal power plants

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Embodiment

[0041] see Figure 1 to Figure 6 , this embodiment takes an experimental heliostat field as an example, the position of the mirror field is as follows image 3 As shown, the following table 1 is the specific parameters of the site.

[0042] Table 1. Parameters related to the experimental mirror field

[0043]

[0044] In this embodiment, the radiant energy density simulation method of the focusing type heliostat in the tower solar thermal power station includes the following steps:

[0045] (1) First determine the relative position between the sub-plane mirrors in local coordinates, and adjust the position and orientation of the sub-plane mirrors as a whole according to the incident direction of sunlight;

[0046] In the tower solar system, considering factors such as system power generation efficiency and control system cost, the heliostat is generally a focusing type heliostat. Focusing heliostats are composed of multiple plane mirrors distributed in spherical, parabo...

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Abstract

The invention discloses a radiation energy density simulation method of a focusing type heliostat in a tower type solar thermal power station, which belongs to the technical field of tower type solarthermal power station simulation, and comprises the following steps: (1) determining the relative positions of sub-plane mirrors in local coordinates, and integrally adjusting the positions and orientations of the sub-plane mirrors according to the incident direction of sunlight; (2) defining an approximate imaging plane according to the reflected light direction of the focusing type heliostat; (3) uniformly dividing the three-dimensional space, and calculating heliostats having shadow and shielding relationships with the heliostats; (4) performing rasterization representation on the approximate imaging plane; (5) calculating radiation energy density distribution on the virtual imaging plane; and (6) projecting the radiation energy density distribution on the virtual imaging plane to a receiving plane through oblique parallel projection. The convolution assignment law and the approximate imaging plane are utilized to obtain the accumulation of the projection areas of the sub-plane mirrors, i.e., the weighted effective reflection areas, so that the solving efficiency of the focusing type heliostat model is improved.

Description

technical field [0001] The invention relates to the technical field of tower-type solar thermal power station simulation technology, in particular to a method for simulating the radiation energy density of a focusing heliostat in a tower-type solar thermal power station. Background technique [0002] Tower solar system is an important way of photothermal power generation, which has the advantages of high conversion efficiency, less heat loss, and stable power output (Vanthull L.L.Solar thermal power systems based on optical transmission[J].Solar Energy, 1976, 18(1 ): 31-39). The development of tower solar energy is affected by factors such as complex system design and high power generation costs. The radiant energy density simulation of tower solar thermal power plants can not only be used to verify design schemes and estimate power generation efficiency, but also for the layout and focusing of heliostats. Strategy and mirror parameters of the heliostat are optimized to imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 赵豫红冯结青牛召星何才透
Owner ZHEJIANG UNIV
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