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A Calculation Method of Heliostat Surface Micro-arc Angle

A calculation method and technology of heliostats, applied in complex mathematical operations, solar ray concentration, lighting and heating equipment, etc., can solve the problems of large overflow loss, difficult processing, high cost, etc., and achieve the reduction of reflection spot size and energy flow The concentration of density distribution and the effect of reducing the cost of mirror field

Active Publication Date: 2020-05-08
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the micro-arc glass mirror is that the spot size is lower than that of the flat mirror under the same conditions, but its processing is difficult, the cost is high, and the localization is not yet mature, which will increase the difficulty and cost of procurement of engineering projects
The production process of flat glass mirrors is mature and simple, the cost is low, and there are many domestic brands. However, the use of pure flat sub-mirrors in large-capacity power station heliostats will lead to large light spots, large overflow losses, low mirror field efficiency, and increased mirror field. scheduling difficulty

Method used

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  • A Calculation Method of Heliostat Surface Micro-arc Angle
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  • A Calculation Method of Heliostat Surface Micro-arc Angle

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Experimental program
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Embodiment Construction

[0027] Heliostat micro-arc angle structure scheme m×n (indicating m mirrors in the x direction and n mirrors in the y direction)

[0028] The specifications of the heliostat are L×W (length×width)

[0029] Mirror size:

[0030] In the x direction there is an inclination angle θ, expressed as

[0031] in the y direction tilt angle

[0032] A total of m×n sub-mirror coordinate systems need to be established. The coordinate system of each sub-mirror is defined as CS subj , subj=1, 2...m×n.

[0033] Mirror sorting rules:

[0034] Sort in the positive direction of X Sort in negative X direction

[0035] Y positive direction sorting Sort in the negative direction of Y

[0036] The sub-mirrors of the first quadrant are:

[0037]

[0038] The sub-mirrors of the second quadrant are:

[0039]

[0040] The sub-mirrors of the third quadrant are:

[0041]

[0042] The sub-mirrors of the fourth quadrant are:

[0043]

[0044] According to the researc...

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Abstract

The invention discloses a heliostat surface type micro arc angle calculating method, and the method comprises the steps of establishing m*n sub-mirror coordinate systems; determining the rule for ordering the sub-mirrors; and solving a group of optimal angle of inclination xk of the heliostat in each ring in order. Compared with prior art, the method has the advantages that the calculating method is convenient; the micro arc angles of the heliostats in different positions of the whole mirror field can be accurately calculated in high efficiency; construction convenience is considered in an integrated way; according to the angle distribution rule, the whole mirror field is divided into several rings; and each ring employs the same group of micro arc angle. In this way, the optical performance of the mirror field can be guaranteed, and unfavorable influence to engineering construction is avoided. According to the method, the size of reflection light spot is minimized; energy flow density distribution is more concentrated; overflow loss is reduced; mirror field efficiency is raised; and the mirror field cost can be reduced eventually.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, and in particular relates to a method for calculating the micro-arc angle of a heliostat surface. Background technique [0002] Heliostats are usually spliced ​​from multiple sub-mirrors. The sun’s incident light on the heliostat is not a parallel light but a 32’ light cone. In order to reduce the size of the reflected light from the heliostat, it is necessary to process the reflecting surface into a certain arc. The distance between the heaters ranges from 100 to 2000 meters, resulting in a huge difference in focal length. It is necessary to process the sub-mirrors of the heliostat into focal lengths of various sizes to meet the spot performance requirements. [0003] At present, the reflective surface design of the sub-mirror of the tower photothermal project mainly has two forms: a micro-arc reflector and a flat reflector. The advantage of the micro-arc glass mirror is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/16F24S23/70
CPCG06F17/16Y02E10/40
Inventor 王娟娟华文瀚奚正稳孙登科蒋超猛何杰
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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