CN102122176B

CN102122176B - Method for tracking sun by using special single axis according to time variable control and high-temperature heat-collecting device

Info

Publication number: CN102122176B
Application number: CN2010105902070A
Authority: CN
Inventors: 王新庚
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-12-16
Filing date: 2010-12-16
Publication date: 2013-10-23
Anticipated expiration: 2030-12-16
Also published as: CN102122176A

Abstract

The invention provides a method for tracking the sun by a special single axis according to time variable control and a high-temperature heat-collecting device, aiming at the defects of sealing and heat preservation difficulty of a heated medium, and the like when a biaxial omnibearing sun-tracking device is used for mid-high-temperature heat collection. In the method, projection heights on a plane being perpendicular to the ground plane or on a plane being perpendicular to the ground plane and penetrating through a meridian are calculated, and the projection height angle theta=F(phi, beta) isthe function of a solar azimuth phi and an elevating angle beta. In the high-temperature heat-collecting device implementing the method, the single axis is superposed with a heat-collecting vacuum glass tube (1) arranged on a focusing line of a trough-type parabolic cylindrical heat collector (3) and is stationary through a bracket (2); the arrangement direction of the single axis varies with a projection surface perpendicular to or penetrating through the meridian; and the trough-type heat collector is driven by a driver (5) through a segment gear (4) to rotate around the single axis and track the theta angle so as to realize linear-focusing and high-temperature heat collection. The tracking device is particularly suitable for the heat-collecting equipment of a trough-type large-scale solar thermal power system.

Description

Control by time variable with specific single shaft and to follow the tracks of method and the high-temperature heat-gathering device of the sun

Affiliated field

The present invention relates to a kind of controlling by time variable with specific single shaft and follow the tracks of method and the high-temperature heat-gathering device of the sun, can be widely used in the medium and high temperature solar energy industry.

Background technology

For utilizing sun power to obtain high temperature, need to follow the tracks of and be focused on the sun.And at present, follow the tracks of the device of the sun, mostly be greatly the twin shaft omnidirectional tracking, when this device being used for high temperature (seven, 800 degree) thermal-arrest, because the conveyance conduit of heated medium often needs to be provided with the activity link, therefore bring very big difficulty for sealing anti-leak and insulation, be used widely thereby make this tracking means be difficult in sun power the high temperature industrial field.

Summary of the invention

Drawback when being used for high-temperature heat-gathering in order to solve twin shaft omnidirectional tracking device the invention provides a kind of method and high-temperature heat-gathering device of controlling by time variable the sun is followed the tracks of with specific single shaft.

It ' single shaft ' of the present invention is followed the tracks of, and is not present existing the so-called uniaxiality tracking of following the tracks of solar azimuth.This uniaxiality tracking, neither only follow the tracks of the orientation of the sun, neither only follow the tracks of the height of the sun, but follow the tracks of the sun perpendicular to or by the standoff height on meridian and the plane vertical with ground level, this standoff height angle θ=F (Φ, β), be the function of solar azimuth Φ and elevation angle β, or deduce into the function of sun altitude β and declination angle δ, hour angle H.Be perpendicular to or by meridianal difference according to this projecting plane, the direction that described it ' single shaft ' is placed is also not identical.The former north and south horizontal positioned is applicable to the zone of geographic latitude lower (less than 40 °); Latter's thing horizontal positioned is specially adapted to high latitude (greater than 45 °) zone.The present invention namely passes through in this way ' single shaft ', this θ angle is followed the tracks of, and utilize slot type parabolic cylinder line focus, realizes high-temperature heat-gathering.

Description of drawings

Accompanying drawing 1.a, Fig. 1 .b are respectively that projecting plane of the present invention is perpendicular to or during by meridian, the deduction diagram of standoff height angle θ, Fig. 1 .a be " perpendicular to ", Fig. 1 .b be " by ".

Among the figure: HC----sunshine ray, β---sun altitude, the angle between α---sunshine ray and the solar receiver light plane (face of tinting shows); DC is parallel with ground level among the figure, and when I overlapped with the D point, α obtained maximal value, and HD (I) is the projection on (Fig. 1 .a perpendicular to, Fig. 1 .b passes through meridian) on the HGEAD plane of sunshine ray.This standoff height angle θ:

In Fig. 1 .a, sin (θ)=sin (β)/sqrt (1-cos ²(β) Cos ² (φ))

Or sin (θ)=sin (β)/sqrt ( Sin ² (β)+ cos ²δ sin ²H)

In Fig. 1 .b, sin (θ)=sin (β)/sqrt (1-cos ²(β) Sin ² (φ))

Or sin (θ)=sin (β)/sqrt ( 1-cos ²δ sin ²H)

At this moment, the angle ψ of receiver light plane CDEF and ground level is the complementary angle of θ.

Accompanying drawing 2 is specific uniaxiality tracking slot type parabolic cylinder heat collector embodiment (intending being used for miniature boiler) figure.

Among the figure: 1. thermal-arrest glass tube with vacuum (overlap with specific ' single shaft ', north and south or thing are placed and maintained static), 2. support, 3. slot type parabolic cylinder heat collector, 4. sector gear, 5. driver.

Embodiment

The embodiment of the high-temperature heat-gathering device of the tracking sun of controlling by time variable of the above-mentioned tracking of the invention process shows that such as accompanying drawing 2 described high-temperature heat-gathering device adopts slot type parabolic cylinder heat collector; Described ' single shaft ', overlap with the thermal-arrest glass tube with vacuum on being positioned at slot type parabolic cylinder heat collector focal line, difference according to local geographic latitude, north and south or thing are placed, maintain static by support, slot type parabolic cylinder heat collector, the sector gear below it is by driver drives, rotate around ' single shaft ', to realize the tracking to above-mentioned standoff height angle θ; Its driver is paid by minitype speed reducing motor or stepper motor and a reduction gearing and is consisted of.

Computer control part, hardware mainly are comprised of single-chip microcomputer and clock chip; The technical scheme that software adopts intermitten service to follow the tracks of is write with the C Language And Assembly Language.

Beneficial effect of the present invention:

Because the conveyance conduit of thermal-arrest glass tube with vacuum and medium thereof all is fixed, thereby when having solved twin shaft omnidirectional tracking device for high-temperature heat-gathering, anti-leak and insulation hard problem; Again, 1. owing to stable and reliable operation, simple in structure, with low cost, its heat collector can be done very longly (can grow to one, 200 meter); Although 2. it is more lower slightly to the utilization factor of solar energy acceptor than the twin shaft omnidirectional tracking, substantially unobstructed when installing owing to front and back, so its floor area is wanted much less than the twin shaft omnidirectional tracking.Therefore, this single shaft tracking apparatus, but the cost that decrease sun power is used at middle high-temperature field, be specially adapted to middle high-temperature heat collection system (for example Industrial Boiler), can be used as the collecting apparatus of slot type large-sized solar heat generating system fully, in sun-drenched desert, range build-up large-sized solar power house, contribute for reducing greenhouse gas emission.

Claims

1. control by time variable with specific single shaft and follow the tracks of the method for the sun, for follow the tracks of the sun perpendicular to or by the standoff height on meridian and the plane vertical with ground level, this standoff height angle θ is the function of solar azimuth Φ and elevation angle β; Be perpendicular to or by meridianal difference according to the projecting plane, the direction that this function and described ' single shaft ' are placed is also not identical; The former is sin (θ)=sin (β)/sqrt (1-cos ²(β) Cos ² (Φ)), ' single shaft ' north and south horizontal positioned; Latter sin (θ)=sin (β)/sqrt (1-cos ²(β) Sin ² (Φ)), ' single shaft ' thing horizontal positioned; It is characterized in that: by in this way ' single shaft ' this θ angle is followed the tracks of.