CN103076154A - Optical efficiency analysis method for light condensation and heat collection system of solar thermal power generation - Google Patents
Optical efficiency analysis method for light condensation and heat collection system of solar thermal power generation Download PDFInfo
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- CN103076154A CN103076154A CN201210579912XA CN201210579912A CN103076154A CN 103076154 A CN103076154 A CN 103076154A CN 201210579912X A CN201210579912X A CN 201210579912XA CN 201210579912 A CN201210579912 A CN 201210579912A CN 103076154 A CN103076154 A CN 103076154A
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Abstract
The invention discloses an optical efficiency analysis method for a light condensation and heat collection system of solar thermal power generation, solving the problem of an analysis method for light absorption efficiency of the light condensation and heat collection system of large-sized slot type solar thermal power generation. The method comprises the following steps of: photographing a parabolic reflector through a calibrating camera to obtain a three-dimensional digital model of the parabolic reflector; importing the three-dimensional digital model of the parabolic reflector into a computer to obtain a graphic parameter of the parabolic reflector; establishing an analysis model of the parabolic reflector and a heat collection pipe through the graphic parameter of the parabolic reflector; and simulating incidence of sunlight into the established analysis model through the computer so as to acquire a simulation analysis result. According to the optical efficiency analysis method, the influence of an environmental factor is also considered under an actual working condition, can be used as a theoretical analysis tool of the heat collection system and a confirmatory analysis tool under an actual working condition, and has extremely high practicability, convenience, creativity and economy.
Description
Technical field
What the present invention relates to is the solar energy thermal-power-generating field, specifically, is a kind of optical efficiency analytical approach of light and heat collection system of solar energy thermal-power-generating.
Background technology
Trough type solar power generation is a kind of hot generation technology based on sun power, and sun power then belongs to low energy consumption that country advocates, low emission, cleaning, pollution-free, cheap emerging energy, and its DEVELOPMENT PROSPECT is very extensive.The trough type solar power generation system is through series-parallel arrangement with a plurality of grooved parabolic concentrator heat collectors, focus on direct sunlight, the working medium of heating, vacuum thermal-collecting tube the inside produces high temperature, produce again the steam of High Temperature High Pressure by the heat transmission equipment heating water, the generating of driving steam turbine genset.In the tank-type thermal power generation system, optically focused, collecting system are extremely important, and it has determined the efficient of system to a great extent, how to guarantee that the high-level efficiency of light and heat collection system becomes the key of whole system.
Based on the light reflection law, for desirable paraboloidal mirror, in the situation of sunshine vertical incidence, light can converge to parabolical focal position.But, in the actual product, optically focused support and paraboloidal mirror can not be desirable parabolas, therefore, we need to have a cover real and effectively analytical approach analyze the light and heat collection system efficiency of light absorption of trough type solar power generation in the reality, and it is assessed.
Summary of the invention
The object of the invention is to overcome in the prior art optically focused of large-scale trough type solar power generation system, the efficiency of light absorption of collecting system are analyzed difficulty, a kind of efficiency of light absorption analytical approach of convenient, effective, science is provided.
To achieve these goals, the present invention is by the following technical solutions:
A kind of optical efficiency analytical approach of light and heat collection system of solar energy thermal-power-generating may further comprise the steps:
(1) based on existing photographic measurement technology, takes parabolic mirror by calibration for cameras, to obtain the three-dimensional digitalization model of parabolic mirror;
(2) three-dimensional digitalization model with parabolic mirror imports computing machine, draws the graphic parameter of parabolic mirror;
(3) utilize the graphic parameter of parabolic mirror to set up the model of the relative position relation of parabolic mirror and thermal-collecting tube, the object of analyzing as optical efficiency;
(4) incide equably the surface of step (3) parabolic mirror in the model of setting up by the computer simulation sunray, through mirror-reflection, pass the glass tube of thermal-collecting tube, project on the plated film steel pipe of thermal-collecting tube; Simultaneously, based on rectilinear propagation principle, reflection law, the refraction law of light, by computing machine simulated solar light is followed the trail of;
(5) by step (4) ray tracing of doing, draw the quantitative relation of the simulated solar light of simulated solar light on the plated film steel pipe that projects thermal-collecting tube and incident, thereby obtain the optical efficiency of light and heat collection system.
Wherein, in the described step (1) calibration for cameras to shoot the concrete steps of three-dimensional digitalization model of parabolic mirror as follows:
(a) binding mark point on parabolic mirror;
(b) calibration for cameras is determined camera parameter;
(c) parabolic mirror is carried out at least twice and take pictures, and processing in the pictures taken importing computing machine, extract the skeleton point;
(d) by three-dimension measuring system scanning, parabolic mirror is carried out looking measurement more;
(E) computing machine carries out automatic Mosaic, obtains the face shape body information of parabolic mirror;
(F) by computing machine the parabolic reflector minute surface shape body information of obtaining is analyzed, thereby obtained three-dimensional digitalization model and the locus control information of parabolic mirror.
The graphic parameter of the parabolic mirror of described step (3) is the image parameter under the static condition, and the relative position of itself and thermal-collecting tube is the relative position under the static condition; Perhaps, the graphic parameter of the parabolic mirror of described step (3) is the image parameter under the various operating modes, and the relative position of itself and thermal-collecting tube is the relative position under the various operating modes.
When in the described step (C) parabolic mirror being taken pictures, the each shooting all needs and the front once content of shooting has the overlapping of a skeleton band point at least.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) the present invention sets up the analytical model that comprises condenser, thermal-collecting tube, simulated solar irradiation incides the optically focused image that forms behind the model, thereby obtain the sunshine distribution situation at thermal-collecting tube coating steel tube-surface, not only method is simple, analysis is clear and definite, and by the data that the method analysis draws, have more science;
(2) three-dimensional digitalization model of the parabolic mirror among the present invention is set up and by calibration for cameras it is taken to realize, its method is to paste special-purpose monumented point on the parabolic mirror surface, by image-based three-dimensional fix method, obtain the three-dimensional coordinate data of discrete monumented point; Then obtain the three dimensional point cloud on parabolic mirror surface according to these three-dimensional coordinate datas and the scanning of faying face type, thereby obtain the spatial positional information of the parabolic mirror in the reality;
(3) for the practical situations of trough type solar power generation, the present invention has also considered in the real work situation of trough type solar power generation condenser system, the impact of surrounding environment factor, such as environmental parameter: temperature, wind-force, intensity of illumination etc., its caused minute surface is changed, the thermal-collecting tube change in location imports in the analytical model as input value, specifically, this environmental parameter can force parabolic mirror and the certain distortion of thermal-collecting tube appearance in the analytical model, thereby draw a different real work model under the perfect condition, take this real work model as the basis, carry out the light efficiency analysis, thereby the impact of environmental factor is also included in analyzing, therefore, this analytical approach is applicable to the light efficiency analysis of trench light condensing system under the working condition, has very high practicality and creativeness.
Description of drawings
Fig. 1 is the synoptic diagram that the simulated solar light that incides analytical model carries out trace.
Fig. 2 accepts distribution of light situation synoptic diagram in the face for the thermal-collecting tube glazed thread that draws by analytical model.
Fig. 3 is the synoptic diagram that is provided with the parabolic mirror of gauge point.
Fig. 4 is the three-dimensional coordinate synoptic diagram of gauge point.
Fig. 5 is the spatial model of parabolic mirror.
Fig. 6 is the piecemeal synoptic diagram of individual mirrors.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
The light and heat collection system comprises optically focused support, parabolic mirror, vacuum heat collection pipe in the trough type solar power generation, according to the reflection of light law, after sunshine incided parabolic mirror, parabolic mirror reflexed to vacuum heat collection pipe with it, and then finished the work of optically focused, thermal-arrest.In the actual product, optically focused support and parabolic mirror can not be desirable parabolas, therefore, in order to make the trough type solar power generation system reach design standards, be necessary the light and heat collection system of product is analyzed, assesses, find out the factor that affects its work, and strictly control.
In the present embodiment, to achieve these goals, the method that adopts be set up comprise condenser, the sun, thermal-collecting tube in interior analytical model, simulated solar irradiation incides the optically focused image that forms behind the model, thereby obtain the sunshine distribution situation at thermal-collecting tube coating steel tube-surface, can draw the efficiency of light absorption of whole light and heat collection system according to this distribution situation, its concrete steps are as follows:
One, based on existing photographic measurement technology, takes parabolic mirror by calibration for cameras, to obtain the three-dimensional digitalization model of parabolic mirror;
Two, the three-dimensional digitalization model with parabolic mirror imports computing machine, draws the graphic parameter of parabolic mirror; Wherein, the graphic parameter of parabolic mirror mainly comprises: parabolic reflector mirror area, length and width, paraboloid surface type error etc.;
Three, utilize the graphic parameter of parabolic mirror to set up the model of the relative position relation of parabolic mirror and thermal-collecting tube, the object of analyzing as optical efficiency;
Four, incide equably the surface that step 3 is set up the parabolic mirror in the model by the computer simulation sunray, through mirror-reflection, pass the glass tube of thermal-collecting tube, project on the plated film steel pipe of thermal-collecting tube; Simultaneously, based on rectilinear propagation principle, reflection law, the refraction law of light, by computing machine simulated solar light is followed the trail of, as shown in Figure 1, can be obtained the light on the thermal-collecting tube in the analytical model and accept distribution of light situation in the face, as shown in Figure 2;
Five, by step (4) ray tracing of doing, draw the quantitative relation of the simulated solar light of simulated solar light on the plated film steel pipe that projects thermal-collecting tube and incident, thereby obtain the optical efficiency of light and heat collection system.
Wherein, the step of three-dimensional digitalization model that calibration for cameras is shot parabolic mirror is as follows: paste special-purpose gauge point on the parabolic mirror surface, usually, for measuring accuracy try one's best precisely, it is many that gauge point should be tried one's best, black side's point as shown in Figure 3, but lower limb binding mark point as much as possible on its parabolic mirror; Then, by image-based three-dimensional fix method, obtain the three-dimensional coordinate data of discrete gauge point, as shown in Figure 4, what deserves to be explained is, taking the parabolic mirror that is pasted with gauge point by camera need to have lap, to guarantee to take precision; Again according to the three-dimensional coordinate data of gauge point, and the scanning of faying face type obtains the three dimensional point cloud on parabolic mirror surface, thereby obtains the spatial model of the parabolic mirror in the reality as shown in Figure 5.
Complete parabolic mirror finished product is made of four individual mirrors, before calibration for cameras is shot the three-dimensional digitalization model of parabolic mirror, can see individual mirrors by N module unit catoptron as and forms, as shown in Figure 6.The A of the diverse location on parabolic mirror and B point, depart from normal in the situation of equal angular, its situation about inciding on the thermal-collecting tube is also different, namely marginal position is just higher to the requirement of parabolic mirror own up and down near minute surface, wherein, itself requires to comprise minute surface face type and the installation of parabolic mirror.According to above-mentioned, it is as the basis take every individual mirrors that present embodiment adopts the method for binding mark point, individual mirrors is divided into N module unit catoptron, then carries out the stickup of gauge point take every module unit catoptron as benchmark, and the bonding method of gauge point is identical on all unit reflecting mirrors; Wherein, N 〉=2.Need to prove that the individual mirrors cutting unit piece of diverse location is different according to the large I that affected by error precision.
Practical situations for trough type solar power generation, the present invention considers the impact of surrounding environment factor, with environmental parameter: temperature, wind-force, intensities of illumination etc. import in the analytical model as input value, specifically, this environmental parameter can force the certain distortion of parabolic mirror appearance in the analytical model, thereby draw a different real work model under the perfect condition, take this real work model as the basis, simulated solar irradiation incides in the real work model again, its light is carried out trace, can obtain the distribution of light situation that the light on the thermal-collecting tube in the real work model is accepted face.This analytical approach is applicable to the light efficiency analysis of trench light condensing system under the working condition, and it still belongs to international pioneering, has very high practicality and creativeness.
According to above-described embodiment, can well realize the present invention.What deserves to be explained is that based on same principle and technology, the present invention can also expand to easily and carry out the system optics efficiency analysis in the disc type solar energy concentrating generating system.
Claims (4)
1. the optical efficiency analytical approach of the light and heat collection system of a solar energy thermal-power-generating is characterized in that, may further comprise the steps:
(1) based on existing photographic measurement technology, takes parabolic mirror by calibration for cameras, to obtain the three-dimensional digitalization model of parabolic mirror;
(2) three-dimensional digitalization model with parabolic mirror imports computing machine, draws the graphic parameter of parabolic mirror;
(3) utilize the graphic parameter of parabolic mirror to set up the model of the relative position relation of parabolic mirror and thermal-collecting tube, the object of analyzing as optical efficiency;
(4) incide equably the surface of step (3) parabolic mirror in the model of setting up by the computer simulation sunray, through mirror-reflection, pass the glass tube of thermal-collecting tube, project on the plated film steel pipe of thermal-collecting tube; Simultaneously, based on rectilinear propagation principle, reflection law, the refraction law of light, by computing machine simulated solar light is followed the trail of;
(5) by step (4) ray tracing of doing, draw the quantitative relation of the simulated solar light of simulated solar light on the plated film steel pipe that projects thermal-collecting tube and incident, thereby obtain the optical efficiency of light and heat collection system.
2. the optical efficiency analytical approach of the light and heat collection system of a kind of solar energy thermal-power-generating according to claim 1 is characterized in that, to shoot the concrete steps of three-dimensional digitalization model of parabolic mirror as follows for calibration for cameras in the described step (1):
(a) binding mark point on parabolic mirror;
(b) calibration for cameras is determined camera parameter;
(c) parabolic mirror is carried out at least twice and take pictures, and processing in the pictures taken importing computing machine, extract the skeleton point;
(d) by three-dimension measuring system scanning, parabolic mirror is carried out looking measurement more;
(E) computing machine carries out automatic Mosaic, obtains the face shape body information of parabolic mirror;
(F) by computing machine the parabolic reflector minute surface shape body information of obtaining is analyzed, thereby obtained three-dimensional digitalization model and the locus control information of parabolic mirror.
3. the optical efficiency analytical approach of the light and heat collection system of a kind of solar energy thermal-power-generating according to claim 1, it is characterized in that: the graphic parameter of the parabolic mirror of described step (3) is the image parameter under the static condition, and the relative position of itself and thermal-collecting tube is the relative position under the static condition;
Perhaps, the graphic parameter of the parabolic mirror of described step (3) is the image parameter under the various operating modes, and the relative position of itself and thermal-collecting tube is the relative position under the various operating modes.
4. the optical efficiency analytical approach of the light and heat collection system of a kind of solar energy thermal-power-generating according to claim 2, it is characterized in that: when in the described step (C) parabolic mirror being taken pictures, the each shooting all needs and the front once content of shooting has the overlapping of a skeleton band point at least.
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| CN106846405A (en) * | 2017-02-27 | 2017-06-13 | 四川大学 | Parabolic trough concentrators based on image procossing intercept the acquisition methods of the factor |
| CN107843207A (en) * | 2017-10-23 | 2018-03-27 | 北京京仪仪器仪表研究总院有限公司 | The one camera real-time measurement system and method for a kind of groove type solar paraboloid surface shape |
| CN108761780A (en) * | 2018-06-20 | 2018-11-06 | 兰州交通大学 | A kind of optical modeling method constructed for condenser in light and heat collection system |
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| CN108761780B (en) * | 2018-06-20 | 2020-11-10 | 兰州交通大学 | Optical modeling method for condenser structure in light-condensing and heat-collecting system |
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Effective date of registration: 20210119 Address after: 195a, 17 houyongkang Hutong, Dongcheng District, Beijing Patentee after: TIANWEI NEW ENERGY SYSTEM ENGINEERING BEIJING Co.,Ltd. Address before: 610200 No.1 Tianwei Road, Industrial Development Zone, Southwest Airport Economic Development Zone, Shuangliu County, Chengdu City, Sichuan Province Patentee before: Tianwei (Chengdu) Solar Thermal Power Development Co.,Ltd. |
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