CN104456980A - Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector - Google Patents

Secondary concentrated reflection-transmission type parabolic-trough type solar heat collector Download PDF

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CN104456980A
CN104456980A CN201410747865.4A CN201410747865A CN104456980A CN 104456980 A CN104456980 A CN 104456980A CN 201410747865 A CN201410747865 A CN 201410747865A CN 104456980 A CN104456980 A CN 104456980A
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fresnel lens
parabolic trough
vacuum heat
solar
reflector
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CN104456980B (en
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金红光
赵雅文
洪慧
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Institute of Engineering Thermophysics of CAS
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Abstract

本发明公开了一种二次聚光反射-透射型抛物槽式太阳能集热器,该集热器包括线聚焦菲涅尔透镜、准直菲涅尔透镜、真空集热管和抛物槽面反射镜,具有单轴光线追踪能力。其中,线聚焦菲涅尔透镜的实焦点与准直菲涅尔透镜的虚焦点重合;真空集热管位于抛物槽面反射镜的焦线位置;平行太阳光经过线聚焦菲涅尔透镜完成一次聚光,再经过准直菲涅尔透镜重新扩散为平行光;抛物槽面反射镜将一次聚光后的平行太阳光反射到真空集热管壁面,完成二次聚光;真空集热管内传热介质吸收聚焦太阳能,完成升温过程。该太阳能集热器可应用于太阳能光热领域,很好解决了在冬季等太阳辐照下降、入射角增大的时段里,传统槽式集热器集热效率大幅降低的难题,且成本低廉。

The invention discloses a secondary concentrating reflection-transmission type parabolic trough solar heat collector, which comprises a line-focusing Fresnel lens, a collimating Fresnel lens, a vacuum heat collecting tube and a parabolic trough reflector , with single-axis ray tracing capability. Among them, the real focus of the line-focusing Fresnel lens coincides with the virtual focus of the collimating Fresnel lens; the vacuum heat collector is located at the focal line of the parabolic trough reflector; the parallel sunlight passes through the line-focusing Fresnel lens to complete a concentration The light is re-diffused into parallel light through the collimated Fresnel lens; the parabolic trough reflector reflects the parallel sunlight after the primary concentration to the wall of the vacuum heat collection tube to complete the secondary concentration; the heat transfer medium in the vacuum heat collection tube Absorb concentrated solar energy to complete the heating process. The solar collector can be used in the field of solar thermal energy, and it solves the problem that the heat collection efficiency of traditional trough collectors is greatly reduced in winter and other periods when the solar radiation decreases and the incident angle increases, and the cost is low.

Description

一种二次聚光反射-透射型抛物槽式太阳能集热器A secondary concentrating reflective-transmissive parabolic trough solar collector

技术领域technical field

本发明涉及太阳能热发电技术领域,尤其涉及一种二次聚光反射-透射型抛物槽式太阳能集热器。The invention relates to the technical field of solar thermal power generation, in particular to a secondary concentrating reflection-transmission parabolic trough solar heat collector.

背景技术Background technique

太阳能作为取之不尽,用之不竭,且清洁无污染的新能源,受到人们越来越广泛的关注。太阳能光热发电按集热形式主要有槽式、塔式和碟式三种,其中槽式太阳能热发电技术最为成熟,国外已实现商业化应用,是近期在世界范围内推进太阳能热发电技术发展的重点方向。As an inexhaustible, inexhaustible, clean and pollution-free new energy source, solar energy has attracted more and more attention from people. There are mainly three types of solar thermal power generation: trough type, tower type and dish type according to the heat collection form. Among them, the trough type solar thermal power generation technology is the most mature and has been commercialized in foreign countries. It is the recent development of solar thermal power generation technology in the world. focus direction.

辐照条件良好的夏季,对于南北轴布置,东西轴跟踪的槽式集热器,峰值集热效率可达65%以上,且全天集热效率波动不大,槽式热发电系统表现出良好的热力性能。然而,随着冬季太阳辐照强度下降,太阳入射角增加,槽式集热器的集热效率明显下降,冬季典型日里的太阳能集热效率仅为30%左右,集热效率下降将带来太阳能热发电系统汽轮机的降负荷运行,导致槽式热发电系统年均发电效率难以提高,或者为了汽机维持稳定运行而增设储能设备,带来投资成本和发电成本进一步提高。In summer with good irradiation conditions, for the trough collectors arranged on the north-south axis and tracked by the east-west axis, the peak heat collection efficiency can reach more than 65%, and the heat collection efficiency does not fluctuate much throughout the day. The trough thermal power generation system shows good thermal performance. performance. However, as the intensity of solar radiation decreases in winter and the angle of incidence of the sun increases, the heat collection efficiency of the trough collector decreases significantly. The solar heat collection efficiency in a typical day in winter is only about 30%. The decline in heat collection efficiency will bring solar thermal power generation. The reduced load operation of the steam turbine in the system makes it difficult to increase the average annual power generation efficiency of the trough thermal power generation system, or the addition of energy storage equipment to maintain stable operation of the steam turbine will further increase the investment cost and power generation cost.

上述集热性能下降导致技术经济性难以提高的问题,是目前槽式热发电技术遇到的关键问题,直接制约了其大规模商业化推广应用。因此,改善槽式集热器在太阳辐照下降且入射角增大时的集热性能,是该领域亟待解决的重要技术问题。The above-mentioned problem that the decline in heat collection performance makes it difficult to improve the technical economy is the key problem encountered by the current trough thermal power generation technology, which directly restricts its large-scale commercial promotion and application. Therefore, improving the heat collection performance of the trough collector when the solar radiation decreases and the incident angle increases is an important technical problem to be solved in this field.

发明内容Contents of the invention

(一)要解决的技术问题(1) Technical problems to be solved

有鉴于此,本发明的主要目的在于提供一种二次聚光透射-反射型抛物槽式太阳能集热器,通过布置线性菲涅尔透镜,准直菲涅尔透镜,实现对太阳能的一次聚光,再通过抛物槽面反射镜实现对太阳能的二次聚光,从而解决目前太阳辐照下降的工作条件下,槽式集热器集热性能下降的技术难题。In view of this, the main purpose of the present invention is to provide a secondary concentrating transmission-reflection parabolic trough solar collector, by arranging linear Fresnel lenses and collimating Fresnel lenses to realize primary concentration of solar energy Light, and then through the parabolic trough reflector to realize the secondary concentration of solar energy, so as to solve the technical problem of the decline of the heat collection performance of the trough collector under the current working conditions of the declining solar radiation.

(二)技术方案(2) Technical solutions

为达到上述目的,本发明提供了一种二次聚光反射-透射型抛物槽式太阳能集热器,该抛物槽式太阳能集热器包括线聚焦菲涅尔透镜1、准直菲涅尔透镜2、真空集热管3和抛物槽面反射镜4,太阳光依次透过线聚焦菲涅尔透镜1和准直菲涅尔透镜2照射至抛物槽面反射镜4,被抛物槽面反射镜4反射汇聚至真空集热管3的壁面,进而提高槽式集热器的集热效率。To achieve the above object, the present invention provides a secondary concentrating reflective-transmissive parabolic trough solar collector, which includes a line-focusing Fresnel lens 1, a collimating Fresnel lens 2. The vacuum heat collecting tube 3 and the parabolic trough reflector 4, the sunlight sequentially passes through the line-focusing Fresnel lens 1 and the collimating Fresnel lens 2 to irradiate the parabolic trough reflector 4, and is irradiated by the parabolic trough reflector 4 The reflection converges to the wall surface of the vacuum heat collection tube 3, thereby improving the heat collection efficiency of the trough heat collector.

上述方案中,所述线聚焦菲涅尔透镜1的实焦点与准直菲涅尔透镜2的虚焦点重合。In the above solution, the real focus of the line-focus Fresnel lens 1 coincides with the virtual focus of the collimating Fresnel lens 2 .

上述方案中,所述太阳光透过线聚焦菲涅尔透镜1完成一次聚光,并照射至准直菲涅尔透镜2。In the above solution, the sunlight passes through the line-focusing Fresnel lens 1 to complete one-time concentration, and irradiates to the collimating Fresnel lens 2 .

上述方案中,所述完成一次聚光的太阳光经过准直菲涅尔透镜2被重新扩散为平行光。In the above solution, the sunlight that has completed primary concentration is re-diffused into parallel light through the collimating Fresnel lens 2 .

上述方案中,所述抛物槽面反射镜4将一次聚光并被重新扩散为平行光的太阳光反射汇聚至真空集热管3的壁面,完成二次聚光。In the above solution, the parabolic trough reflector 4 reflects and converges the sunlight that is once concentrated and re-diffused into parallel light to the wall surface of the vacuum heat collecting tube 3 to complete the secondary concentration.

上述方案中,所述真空集热管3位于抛物槽面反射镜4的焦线位置,以保证太阳光被抛物槽面反射镜4聚焦后,聚焦光斑准确落在真空集热管3上,真空集热管3内部传热介质吸收聚焦太阳能,完成升温过程。In the above scheme, the vacuum heat collecting tube 3 is located at the focal line position of the parabolic trough reflector 4, so as to ensure that after the sunlight is focused by the parabolic trough reflector 4, the focused light spot falls on the vacuum heat collecting tube 3 accurately, and the vacuum heat collecting tube 3. The internal heat transfer medium absorbs concentrated solar energy to complete the heating process.

上述方案中,该抛物槽式太阳能集热器具有单轴光线追踪能力。In the above solution, the parabolic trough solar collector has a single-axis ray tracing capability.

(三)有益效果(3) Beneficial effects

从上述技术方案可以看出,本发明具有以下有益效果:As can be seen from the foregoing technical solutions, the present invention has the following beneficial effects:

1、利用本发明,通过菲涅尔透镜和抛物槽面反射镜,可实现对太阳辐照的二次聚光,从而增大真空集热管接受的太阳能能流密度,大幅提高槽式集热器的集热效率。1. Using the present invention, through the Fresnel lens and the parabolic trough reflector, the secondary concentration of solar radiation can be realized, thereby increasing the solar energy flux density received by the vacuum heat collecting tube, and greatly improving the trough collector. heat collection efficiency.

2、利用本发明,菲涅尔透镜是多由聚烯烃材料注压而成的薄片,镜身轻薄。用菲涅尔透镜作为二次聚光装置,相对增大传统槽式集热器开口面积以收集更多太阳辐照的方式,可降低太阳能集热器对支撑结构的强度要求,节省支架的钢用量,从而节约成本,提高槽式太阳能热发电的经济性。2. Utilizing the present invention, the Fresnel lens is mostly a thin sheet made of polyolefin material, and the lens body is light and thin. Using a Fresnel lens as a secondary light concentrating device can relatively increase the opening area of the traditional trough collector to collect more solar radiation, which can reduce the strength requirements of the solar collector for the supporting structure and save steel for the support The amount used, thereby saving costs and improving the economy of trough solar thermal power generation.

3、利用本发明,菲涅尔透镜具有加工便捷,可批量生产,价格便宜等优点,在现代工业中早已被广泛应用。用菲涅尔透镜作为二次聚光装置,可降低高聚光比太阳能集热器的自身造价,提高槽式太阳能热发电的经济性。3. Utilizing the present invention, the Fresnel lens has the advantages of convenient processing, mass production, and low price, and has been widely used in modern industry. Using a Fresnel lens as a secondary light concentrating device can reduce the cost of the high concentration ratio solar collector and improve the economical efficiency of trough solar thermal power generation.

4、利用本发明,可根据实际集热需求变化,重新对线性菲涅尔透镜和准直菲涅尔透镜进行结构设计,从而通过只更换菲涅尔透镜的方式调整集热器的聚光比,易于对集热器进行改造。4. With the present invention, according to the change of actual heat collection requirements, the structural design of the linear Fresnel lens and the collimation Fresnel lens can be redesigned, so that the light concentration ratio of the heat collector can be adjusted by only replacing the Fresnel lens , easy to transform the collector.

附图说明Description of drawings

图1为传统抛物槽式太阳能集热器的示意图;Fig. 1 is the schematic diagram of traditional parabolic trough solar collector;

其中附图标记为:1-真空集热管;2-抛物槽面反射镜。Wherein the reference signs are: 1 - vacuum heat collecting tube; 2 - parabolic groove reflector.

图2为依照本发明实施例的二次聚光透射-反射型抛物槽式太阳能集热器的示意图;2 is a schematic diagram of a secondary concentrating transmission-reflection parabolic trough solar collector according to an embodiment of the present invention;

其中附图标记为:1-线聚焦菲涅尔透镜;2-准直菲涅尔透镜;3-真空集热管;4-抛物槽面反射镜。The reference signs are: 1-line focusing Fresnel lens; 2-collimating Fresnel lens; 3-vacuum heat collecting tube; 4-parabolic groove mirror.

具体实施方式Detailed ways

为使本发明的目的、技术方案和优点更加清楚明白,以下结合具体实施例,并参照附图,对本发明进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

如图2所示,本发明提供的透射-反射型抛物槽式太阳能集热器,包括线聚焦菲涅尔透镜1、准直菲涅尔透镜2、真空集热管3和抛物槽面反射镜4,太阳光依次透过线聚焦菲涅尔透镜1和准直菲涅尔透镜2照射至抛物槽面反射镜4,被抛物槽面反射镜4反射汇聚至真空集热管3的壁面,进而提高槽式集热器的集热效率。As shown in Figure 2, the transmissive-reflective parabolic trough solar collector provided by the present invention includes a line-focusing Fresnel lens 1, a collimating Fresnel lens 2, a vacuum heat collecting tube 3 and a parabolic trough reflector 4 , the sunlight passes through the line-focusing Fresnel lens 1 and the collimating Fresnel lens 2 to irradiate to the parabolic trough reflector 4, and is reflected by the parabolic trough reflector 4 to the wall of the vacuum heat collecting tube 3, thereby improving the trough heat collection efficiency of the collector.

线聚焦菲涅尔透镜1的实焦点与准直菲涅尔透镜2的虚焦点重合。线聚焦菲涅尔透镜1将平行太阳光进行一次聚光,并照射至准直菲涅尔透镜2;准直菲涅尔透镜2将一次聚光后的太阳光重新扩散为平行太阳光,并照射至抛物槽面反射镜4;抛物槽面反射镜4将经历一次聚光后的该平行太阳光反射汇聚至真空集热管3的壁面,实现二次聚光。真空集热管3位于抛物槽面反射镜4的焦线位置,以保证近似平行的太阳光线被聚焦后,聚焦光斑可准确落在真空集热管3上,真空集热管3内部的传热介质吸收聚焦太阳能,完成升温过程。The real focal point of the line focusing Fresnel lens 1 coincides with the virtual focal point of the collimating Fresnel lens 2. The line-focusing Fresnel lens 1 condenses the parallel sunlight once and irradiates it to the collimating Fresnel lens 2; the collimating Fresnel lens 2 re-diffuses the once-condensed sunlight into parallel sunlight, and The parabolic trough reflector 4 is irradiated; the parabolic trough reflector 4 reflects and converges the parallel sunlight after the primary concentration to the wall surface of the vacuum heat collecting tube 3 to realize secondary concentration. The vacuum heat collecting tube 3 is located at the focal line position of the parabolic trough reflector 4 to ensure that after the approximately parallel solar rays are focused, the focused spot can accurately fall on the vacuum heat collecting tube 3, and the heat transfer medium inside the vacuum heat collecting tube 3 absorbs and focuses Solar energy completes the heating process.

在传统槽式集热器中,如图1所示,抛物槽式反射镜只能在开口面内接收太阳光,在冬季等辐照强度下降的时段内,开口面积内接收的太阳光能量密度下降,镜场集热性能下降明显,导致年均效率降低。In the traditional trough collector, as shown in Figure 1, the parabolic trough reflector can only receive sunlight in the opening surface. Decrease, the heat collection performance of the mirror field decreases significantly, resulting in a decrease in the average annual efficiency.

在本发明中,如图2所示,通过在抛物槽面反射镜开口面方向布置线性菲涅尔透镜和准直菲涅尔透镜,可将更多太阳光汇聚到抛物槽面反射镜上,从而解决冬季等太阳辐照下降以及太阳入射角增加后,由于集热器接收的有效入射太阳辐照下降,而导致集热效率下降的问题,有效提高了低辐照下镜场的集热性能。In the present invention, as shown in Figure 2, by arranging a linear Fresnel lens and a collimating Fresnel lens in the direction of the opening of the parabolic trough reflector, more sunlight can be concentrated on the parabolic trough reflector, This solves the problem that the heat collection efficiency decreases due to the decline in the effective incident solar radiation received by the collector after the solar radiation decreases in winter and the solar incident angle increases, and effectively improves the heat collection performance of the mirror field under low radiation.

本发明提供的二次聚光反射-透射型抛物槽式太阳能集热器,具有单轴光线追踪能力,可根据实际需要加热量或者实际需要达到温度,确定太阳能集热器的聚光比,从而确定线聚焦菲涅尔透镜和准直菲涅尔透镜的齿角、齿距,抛物面反射镜的开口形状、开口宽度等结构参数。The secondary concentrating reflective-transmissive parabolic trough solar collector provided by the present invention has uniaxial ray tracing capability, and can determine the concentrating ratio of the solar collector according to the actual required heating amount or the actual required temperature, thereby Determine the tooth angle and pitch of the line-focusing Fresnel lens and collimating Fresnel lens, the opening shape and opening width of the parabolic reflector and other structural parameters.

以南北水平轴布置东西跟踪的槽式集热器LS3为例,对其进行二次聚光的设计改造,假设集热器设置在我国太阳能资源丰富的石嘴山地区,其年有效累计辐照(大于300W/m2)可达1988kWh/m2。其中,夏至日正午的有效入射辐照为:DNI×cosθ=1022W/m2×0.96=981W/m2;然而,在冬至日,正午有效入射辐照下降至:DNI×cosθ=900W/m2×0.46=414W/m2。其中,cosθ为太阳入射角的余弦。由此可见,即使在太阳能资源如此丰富的一类地区,正午冬季有效辐照相比夏季也至少下降了一半,即在跟踪方式不变,集热器面积一定情况下,冬季镜面接收到的能量密度下降了约一半。Taking the trough collector LS3 with the north-south horizontal axis arranged east-west tracking as an example, the design and transformation of the second concentration is carried out. Assuming that the collector is installed in the Shizuishan area with abundant solar energy resources in China, its annual effective cumulative radiation (greater than 300W/m 2 ) up to 1988kWh/m 2 . Among them, the effective incident radiation at noon on the summer solstice is: DNI×cosθ=1022W/m 2 ×0.96=981W/m 2 ; however, on the winter solstice, the effective incident radiation at noon drops to: DNI×cosθ=900W/m 2 ×0.46=414W/m 2 . Among them, cosθ is the cosine of the sun's incident angle. It can be seen that even in a type of area with such abundant solar energy resources, the effective irradiance at noon in winter has dropped by at least half compared with summer, that is, the energy received by the mirror in winter is the same as the tracking method and the collector area is constant. Density dropped by about half.

为了提高冬季能量密度,可以考虑在冬季为槽式集热器加装线性菲涅尔透镜和准直菲涅尔透镜,进行二次聚光。冬至日抛物槽开口面接收太阳光的能量密度减少约一半,如使其再次提升至夏至日水平,透镜组的收束比(即线聚焦菲涅尔透镜焦距与准直菲涅尔透镜焦距之比)设定为f2/f1=2。对于开口为5.77m,抛物槽面反射镜焦距为1.71m的LS3槽式集热器,计算可得,线聚焦菲涅尔透镜焦距f2约为6m,两个透镜间距约为3m。据估计,二次聚光改造后,太阳能集热场的年均集热效率将由现有年均45%~50%提升至60%~65%。In order to improve the energy density in winter, it can be considered to add linear Fresnel lens and collimating Fresnel lens to the trough collector in winter for secondary concentration. On the winter solstice, the energy density received by the opening surface of the parabolic trough is reduced by about half. ratio) is set to f 2 /f 1 =2. For the LS3 trough collector with an opening of 5.77m and a focal length of the parabolic trough mirror of 1.71m, it can be calculated that the focal length f2 of the line focusing Fresnel lens is about 6m, and the distance between the two lenses is about 3m. It is estimated that after the second concentrating transformation, the annual average heat collection efficiency of the solar heat collection field will increase from the current annual average of 45% to 50% to 60% to 65%.

以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1.一种二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,该抛物槽式太阳能集热器包括线聚焦菲涅尔透镜(1)、准直菲涅尔透镜(2)、真空集热管(3)和抛物槽面反射镜(4),太阳光依次透过线聚焦菲涅尔透镜(1)和准直菲涅尔透镜(2)照射至抛物槽面反射镜(4),被抛物槽面反射镜(4)反射汇聚至真空集热管(3)的壁面,进而提高槽式集热器的集热效率。1. a secondary concentrating reflection-transmission type parabolic trough solar collector, is characterized in that, this parabolic trough solar collector comprises line focusing Fresnel lens (1), collimating Fresnel lens ( 2), the vacuum heat collector (3) and the parabolic trough reflector (4), the sunlight sequentially passes through the line focusing Fresnel lens (1) and the collimating Fresnel lens (2) to irradiate the parabolic trough reflector (4), reflected by the parabolic trough reflector (4) and converged to the wall surface of the vacuum heat collection tube (3), thereby improving the heat collection efficiency of the trough heat collector. 2.根据权利要求1所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,所述线聚焦菲涅尔透镜(1)的实焦点与准直菲涅尔透镜(2)的虚焦点重合。2. secondary concentrating reflection-transmission type parabolic trough solar collector according to claim 1, is characterized in that, the real focal point of described line focusing Fresnel lens (1) and collimating Fresnel lens The virtual focus of (2) coincides. 3.根据权利要求1所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,所述太阳光透过线聚焦菲涅尔透镜(1)完成一次聚光,并照射至准直菲涅尔透镜(2)。3. secondary concentrating reflection-transmission type parabolic trough solar heat collector according to claim 1, is characterized in that, described sunlight passes through line focusing Fresnel lens (1) to complete primary concentrating, and Irradiation hits the collimating Fresnel lens (2). 4.根据权利要求3所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,所述完成一次聚光的太阳光经过准直菲涅尔透镜(2)被重新扩散为平行光。4. The secondary concentrating reflective-transmissive parabolic trough solar collector according to claim 3, characterized in that the sunlight that completes the primary concentrating is re-transmitted through the collimating Fresnel lens (2). Diffusion into parallel light. 5.根据权利要求4所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,所述抛物槽面反射镜(4)将一次聚光并被重新扩散为平行光的太阳光反射汇聚至真空集热管(3)的壁面,完成二次聚光。5. The secondary concentrating reflection-transmission type parabolic trough solar heat collector according to claim 4, characterized in that, the parabolic trough reflector (4) will once concentrate and be re-diffused into parallel light The reflected sunlight converges to the wall surface of the vacuum heat collecting tube (3) to complete secondary light concentration. 6.根据权利要求1所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,所述真空集热管(3)位于抛物槽面反射镜(4)的焦线位置,以保证太阳光被抛物槽面反射镜(4)聚焦后,聚焦光斑准确落在真空集热管(3)上,真空集热管(3)内部传热介质吸收聚焦太阳能,完成升温过程。6. The secondary concentrating reflection-transmission type parabolic trough solar collector according to claim 1, characterized in that, the vacuum heat collecting tube (3) is located at the focal line position of the parabolic trough reflector (4) , to ensure that after sunlight is focused by the parabolic trough reflector (4), the focused light spot falls on the vacuum heat collecting tube (3) accurately, and the heat transfer medium inside the vacuum heat collecting tube (3) absorbs the focused solar energy to complete the heating process. 7.根据权利要求1所述的二次聚光反射-透射型抛物槽式太阳能集热器,其特征在于,该抛物槽式太阳能集热器具有单轴光线追踪能力。7. The secondary concentrating reflective-transmissive parabolic trough solar collector according to claim 1, characterized in that the parabolic trough solar collector has a single-axis ray tracing capability.
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