WO2014075411A1

WO2014075411A1 - Solar energy concentrator

Info

Publication number: WO2014075411A1
Application number: PCT/CN2013/072748
Authority: WO
Inventors: 陈宇奇
Original assignee: 新疆尚孚新能源科技有限公司
Priority date: 2012-11-17
Filing date: 2013-03-15
Publication date: 2014-05-22
Also published as: CN103822368A

Abstract

Provided is a solar energy concentrator, comprising a concentrator reflector plate (2), a heat-collecting pipe (1), a reflector plate bracket (3) and a concentrator upright column (4). The concentrator reflector plate (2) has two parabolic reflector plates with the same focal point. The solar energy concentrator can increase the length of a single-drive parabolic trough, thereby reducing connecting parts and tracking control components, and being particularly suitable for collecting surfaces with high collecting centre requirements. The solar energy concentrator has a light weight per unit length, low wind resistance, and also has a rainwater self-cleaning function.

Description

Solar concentrator

TECHNICAL FIELD The present invention relates to a solar concentrator. Say

Background technique

In US 2011/0108091 A1, a solar collector suitable for use in a book solar energy collection system is constructed which comprises a collector, a support supporting the collector and a tracking system enabling the collector to track the movement of the sun along at least one axis. The collector includes one or more reflectors, one or more solar receivers, and a support structure that provides mechanical support for the reflector and the solar receiver. Some designs include a reflector that has a spatial curvature. That is, the reflector plate has a convex shape in one direction and a concave shape in the other direction. In another aspect of the invention, the collector includes a solid frame support structure. In US 8,039,777 B2, a solar collector suitable for use in a solar energy collection system, although three separate reflector plates are shown, it should be noted that any number of reflectors can form a concave reflecting surface. . These reflectors can be attached in any suitable manner. For example, in the particular device illustrated, the edges of the reflector plates 310a/310b/310c are superimposed on each other and are secured together using any suitable means, such as fasteners, bolts, adhesives, pins, welds, and the like. Various specific devices include a plurality of reflectors, each of which is curved so that they together form a reflective surface having a concave and/or parabolic shape. In other embodiments, each of the reflectors 310a/310b/310c is substantially flat in the xy plane, but angled such that they collectively spliced into a concave or parabolic shape. They can be slightly curved along the longitudinal axis. The shortcomings of the above two patents are that the arc length of the mirror surface under the same opening is too large, there is no air gap, and the wind resistance is large, and the overall lifting brings inconvenience to the construction. The above structure is mostly applicable to a focal plane where the focus center requires low (appropriate divergence).

SUMMARY OF THE INVENTION To overcome the deficiencies of the prior art described above, it is said that the parabolic trough width is increased for the current popularity, that is, the solar incident area is increased to increase the concentrating ratio to cope with direct thermal steam (DSS) or molten salt heat transfer medium (Molten-Salt).

Book

HTF)'s heat collecting trend, the shortcoming of the existing single parabolic profile technology is that the parabolic trough structure and space volume, weight and materials are also correspondingly increased. Wind loads, large mirror fabrication and operational deformation, and resonant characteristics are all challenging. This double throwing coke solar parabolic trough technology will solve the above problems. In addition, it also has the advantages of self-cleaning of rainwater and mirror cleaning in normal operation. The invention provides a solar concentrator with a short mirror surface length, small wind resistance and convenient installation. The solar concentrator of the present invention comprises a concentrator reflector, a heat collecting tube, a reflector bracket and a concentrator column, wherein the concentrator reflector has two parabolic reflectors, wherein:

1. The parabolic parabola of the first parabolic reflector, that is, the basic parabola, conforms to the formula:

4x f

2. The parabolic parabola of the second parabolic reflector, that is, the parabolic cluster with a distance of α, conforms to the formula:

X

ι^. = one _ + a

" 4 X (/士a where, "-" is the farthing focus line cluster; "+" is the progressive focus line cluster. Instruction manual

In the above formula, yl is parabola 1; y2 is parabola 2; x is the parabolic horizontal coordinate value; f is the focal length of the parabola; a is the distance between the two parabolas. The value of f ranges from 1500 to 2000 匪, and the preferred value ranges from 1650 to 1800 mm. The value of a ranges from 100 to 1000 mm, and the preferred value ranges from 300 to 500 匪.

The advantages of the invention are:

1. Reduce weight per unit length at the same concentration ratio, saving material and cost;

2. Wind pressure release function;

3. Rainwater self-cleaning function;

4. Separate the joint deformation to improve the optical concentration accuracy;

5. Improve the resonance frequency;

6, increase the length of the single-drive parabolic trough, thereby reducing the connector and control tracking components;

7. It is especially suitable for the focal plane where the focus center requires high (not divergent). DRAWINGS

The drawing is a schematic view of the structure of the present invention, which is composed of a concentrator reflector (2), a heat collecting tube (1), a concentrator column (4) and a reflector bracket (3). detailed description

The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

Referring to the drawings, the present invention includes a concentrator reflector (2), a heat collecting tube (1), a concentrator column (4), and a reflector bracket (3), and the concentrator reflector (2) has two parabolic reflections. Board, where:

1. The parabolic parabola of the first parabolic reflector, that is, the basic parabola, conforms to the formula: 2. The parabolic parabola of the second parabolic reflector, that is, the parabolic cluster with a distance of α, conforms to the formula:

X ² : _

ν _Ί = - a

" 4 x ( /士) where "-" is the farthing focus of the line cluster; "+" is the progressive focus line cluster. In the above formula, yl is parabola 1; y2 is parabola 2; x is the parabolic horizontal coordinate Value; f is the book

The focal length of the parabola; a is the distance between the two parabolas. The range of f is 1500-2000mm, and the preferred value is 1650-1800诵; the value of a ranges from 100 to 1000匪, and the preferred value is 300-500匪. When a is less than or equal to 100mm, there is no "winding" unloading function, which is not desirable; a is greater than or equal to lOOOmni, because the sun angle will greatly affect the optical precision, and it is not desirable.

Claims

claims

1. A solar concentrator, including a concentrator reflecting plate, a heat collecting tube, a concentrator column and a reflecting plate bracket, characterized in that the concentrator reflecting plate has two parabolic reflecting plates, wherein:

(1) The basic parabola of the first parabolic reflector conforms to the formula:

V -

4x/

(2) The cross-section parabola of the second parabolic reflector conforms to the formula:

2

_

v ₂二■ ha

" " 4 x (±) In the above formula, the value range of f is 1500-2000 legs, and the value range of a is 100-1000 legs.

2. The solar concentrator according to claim 1, characterized in that in the formula, the preferred value range of f is 1650-1800 mm; the preferred value range of a is 300-500 mm.