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Optimized layout method for mirror field of linear Fresnel concentration system

A technology of linear Fresnel and concentrating system, which is applied in the field of optimal arrangement of shadowless mirror fields, and can solve the problems of shadow effect of linear Fresnel concentrating system, etc.

Active Publication Date: 2014-12-24
兰州大成科技股份有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the influence of the distance between adjacent reflectors, the linear Fresnel concentrating system generally has shadow effects; the linear Fresnel concentrating solar thermal energy high temperature and high pressure system requires a single-tube receiver composed of a CPC and a vacuum heat collecting tube, which has a large impact on There are special requirements for the arrangement of the mirror field: the incident angle of the reflected light of the farthest mirror must be less than or equal to the maximum acceptance half angle of the CPC

Method used

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  • Optimized layout method for mirror field of linear Fresnel concentration system
  • Optimized layout method for mirror field of linear Fresnel concentration system
  • Optimized layout method for mirror field of linear Fresnel concentration system

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Embodiment 1

[0027] See figure 1 , The layout principle of the mirror field of the linear Fresnel concentrating system. The maximum accepted half angle of CPC is θ max ;The receiver is placed at the height H from the plane where the mirror is located; the width of the mirror is D; the distance between the center of the nth mirror and the center of the mirror field is Q n , the angle between it and the horizontal plane is β n (tilt angle); the distance between adjacent mirrors is S n ; The incident angle of sunlight is α(α ); the incident angle of reflected light is θ n .

[0028] A method for optimizing the arrangement of the mirror field of a linear Fresnel type concentrating system, the main feature of which is to include the following steps:

[0029] (1) Select the CPC and determine the maximum acceptance half-angle θ of the CPC max and the width D of the mirror;

[0030] (2) Set the sunlight incident angle α( ) and mirror row number N;

[0031] (3) given CPC height H;

[0...

Embodiment 2

[0048] Embodiment 2: a method for optimizing the layout of the mirror field of a linear Fresnel type concentrating system, setting the sunlight incident angle α to be 60° and 30° respectively, that is, the shadow-free working time t of the system is 4h and 8h respectively, the steps And other parameters are with embodiment 1. The arrangement spacing of the 21 columns of reflectors for the shadowless working time of the system for 4h and 8h are shown in Table 2 and Table 3 respectively:

[0049] Table 2 The mirror field layout of the system with shadowless working time of 4h

[0050]

[0051] Table 3 The mirror field layout of the system with a shadow-free working time of 8 hours

[0052]

Embodiment 3

[0053] Embodiment 3: A method for optimizing the arrangement of the mirror field of a linear Fresnel type concentrator system. If the solar incident angle α is selected to have different values, it corresponds to different arrangement spacings, and different arrangement spacings correspond to different ground coverage. The relationship between the shadow-free working time of the system and the ground coverage is as follows: figure 2 shown.

[0054] The optimal layout method of the mirror field of the linear Fresnel type concentrating system, the shadowless working time t of the system is selected as 6h by optimizing the ground coverage (the system without shadows corresponding to the sunlight incident angle α=45° working hours), and the ground coverage rate is 73.28%.

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Abstract

The invention relates to an optimized layout method for a mirror field of a linear Fresnel concentration system. The optimized layout method for the mirror field of the linear Fresnel concentration system is mainly characterized in that the method comprises the following steps: 1) selecting a CPC (Compound Parabolic Concentrator) and determining maximum acceptance one-half angle theta <max> and reflector width D of the CPC; 2) determining sunlight incident angle alpha as shown therein and reflector rows N; 3) giving CPC height H; 4) conducting initialization: giving a position and an inclination angle of a central reflector of the mirror field; 5) obtaining distance Qn as shown therein of each row of reflectors to the center of the mirror field; 6) if the reflected light incident angle of the farthest end reflector is smaller than or equal to the CPC maximum acceptance one-half angle theta <max>, turning to step 7, and otherwise assumed H=H+1, turning to step 4; 7) ending calculation and saving a calculation result. The calculation result is the layout spacing of N rows of reflectors of the system when no-shade working time is t (which can be obtained through the sunlight incident angle alpha).

Description

technical field [0001] The present invention relates to a method for optimizing the arrangement of a shadowless mirror field, in particular to the optimization of the mirror field of a compound parabolic concentrator (CPC) and a vacuum heat collecting tube receiver (single tube receiver) linear Fresnel concentrating system Layout method. Background technique [0002] The total amount of solar energy is huge, but the energy flux density is low. The best technical route to improve the efficiency of solar energy utilization is to concentrate light and then use it. According to the concentrating form, the solar concentrating system mainly includes trough type, linear Fresnel type, tower type and dish type, etc. The linear Fresnel concentrating system has the advantages of simple structure, small wind resistance, low cost, and high land utilization rate, and is gradually being applied in large-scale power stations. [0003] However, due to the influence of the distance between ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/10F24J2/46F24S23/70
CPCF24S23/77F24S23/79F24S23/80F24S2023/872Y02E10/40
Inventor 范多旺马军王成龙范多进
Owner 兰州大成科技股份有限公司
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