CN201945061U - Fresnel intermediate-high temperature solar heat-collecting device - Google Patents

Abstract

The utility model discloses a Fresnel intermediate-high temperature solar heat-collecting device, which mainly comprises an installation seat (1) and a receiver (2) arranged at the upper end of the installation seat (1), wherein a Fresnel line-focus reflector which is formed into a primary reflector (4) is positioned below the receiver (2), the insection surface of the primary reflector (4) is a film-coated layer, and the other surface of the primary reflector (4) is a sun-facing surface. The Fresnel intermediate-high temperature solar heat-collecting device can realize the intermediate-high temperature solar heat collection, improves the heat-collecting efficiency of a system, enables the structure of the system to be light, and the fabrication cost and the maintenance cost are lowered.

Description

Fresnel medium and high temperature solar heat collector

technical field

The utility model relates to a solar heat collecting device, in particular to a Fresnel medium-high temperature solar heat collecting device.

Background technique

Energy shortage and environmental problems have gradually become a major bottleneck restricting the long-term development of my country and the world economy and society. In order to solve this problem, in addition to vigorously carrying out energy conservation and scientific energy use and striving to develop fossil fuels, the development and utilization of renewable energy must be accelerated. The development and utilization of renewable energy plays a very important role in optimizing the energy structure, protecting the environment, reducing greenhouse gas emissions, and coping with climate change. In this regard, solar energy plays a particularly important role. Solar energy is a clean, abundant and renewable resource. Solar energy is the most abundant and widely available form of renewable energy in my country and in the world. Its extensive use will change my country's unreasonable energy structure and diversify energy supply. Solar energy is undoubtedly the largest renewable energy source that can be developed on the earth at present. According to the different forms of conversion of solar radiation energy reaching the earth, the utilization of solar energy can be divided into two categories: photothermal and photovoltaic.

Solar thermal utilization is mainly divided into low temperature thermal utilization, medium temperature thermal utilization and high temperature thermal utilization. Solar water heaters are only low-temperature solar energy utilization, which is a very small part of solar heat utilization. In fact, there are still many fields where solar energy can be used, especially in the field of medium and high temperature. In China, industrial energy accounts for about 70% of energy consumption, so high-temperature heat in industry has become the main source of high energy consumption. In terms of medium and high temperature application fields of solar energy, such as solar thermal power generation, heating, refrigeration, seawater desalination, beer fermentation, etc., my country is still basically blank at present.

Most of the existing solar medium and high temperature heat collection technologies use trough (composite curved surface) reflective heat collection devices. The disadvantage of the traditional trough heat collector is that the system is bulky and bulky, and the windward surface is large, so the wind resistance design must be added when the system is installed, and the power required for the sun tracking is also large, and the manufacturing cost is high.

The Fresnel line focusing heat collection technology greatly reduces the weight of the heat collection device, so the manufacturing cost is lower than that of the trough heat collection method in the application of solar energy medium and high temperature heat collection. The Fresnel line focusing heat collection technology is further divided into two structures: lens heat collection and reflection heat collection. Among them, the installation method of the lens heat collection is the high position of the lens and the low position of the receiver; the disadvantage is that the lens area is large, and the high position installation leads to a large windward surface, which reduces the stability of the system and increases the cost. The reflective heat collecting mirror is installed at a low position, reducing wind resistance, increasing system stability and reducing costs. The usual Fresnel reflector uses the serrated surface as the light-facing surface. The disadvantage is that it is easy to deposit dust in the outdoor environment for a long time and affect the reflection effect. The existing solution is to add a set of light-transmitting flat protective cover on the reflector; the disadvantage of this is to increase the cost and reduce the reflective performance.

Utility model content

The purpose of the utility model is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a Fresnel medium-high temperature solar heat collection device, which can realize medium-high temperature heat collection of solar energy, and improve the efficiency of the system. High heat collection efficiency, light system structure, reduced manufacturing cost and maintenance cost.

The purpose of the utility model is achieved through the following technical solutions: the Fresnel medium-high temperature solar heat collection device is mainly composed of a mounting base and a receiver arranged on the upper end of the mounting base, and a Fresnel line is arranged below the receiver. The focusing reflector constitutes a main reflector, and the serrated surface of the main reflector is a coating layer, and the other surface of the main reflector is a sun-facing surface.

The main reflector is mainly composed of at least two Fresnel line focusing reflectors, and all the Fresnel line focus reflectors are located in the same plane.

The upper end of the mounting seat is provided with a rotating shaft, and a rotating sleeve is set on the rotating shaft, and the receiver is arranged on the rotating shaft along the axis of the rotating shaft; the main reflector is connected to the rotating sleeve through the main bracket.

The main support is mainly composed of a ring-shaped support with an upward opening, and the two ends of the ring-shaped support are connected to the rotating sleeve through a transverse support; the main reflector is arranged on the inner surface of the ring-shaped support.

The utility model also includes a tracking system, the tracking system is mainly composed of a stepping motor, a gear connected with the stepping motor, and a ring gear meshed with the gear, and the ring gear is installed on the inner surface of the circular bracket superior.

A Fresnel line focusing reflector is arranged above the receiver to form a sub-reflector, and the serrated surface of the sub-reflector is a coating layer, and the serrated surface is a reflective surface.

The upper end of the mounting seat is provided with a rotating shaft, and a rotating sleeve is set on the rotating shaft, and the receiver is arranged on the rotating shaft along the axis of the rotating shaft; the secondary reflector is connected to the rotating sleeve through the secondary bracket.

The secondary support is mainly composed of a V-shaped support, and the lower end of the V-shaped support is connected to the rotating sleeve; the secondary reflector is installed on the upper end of the V-shaped support.

The material of the primary reflector and the secondary reflector is transparent polymethyl methacrylate or glass, but it is not limited thereto, and can also be selected according to actual needs.

The receiver is a CSP vacuum metal straight-through tube, and the CSP vacuum metal straight-through tube is used as the receiver. On the one hand, it can achieve effective heat collection and heat preservation, and on the other hand, it is convenient for series connection between heat collectors to form an effective array, providing industrial and commercial application.

In summary, the beneficial effects of the utility model are:

(1) Adopt Fresnel reflector line focusing heat collection method, which can realize medium and high temperature heat collection of solar energy, the system structure is light and compact, and the cost is lower than that of curved surface line focusing;

(2) The smooth surface of the main reflector faces the sunlight, which effectively overcomes the problem of dust accumulation caused by facing the sunlight with the toothed surface, improves the heat collection efficiency of the system, and reduces maintenance costs;

(3) The Fresnel secondary reflection structure is adopted to effectively improve the collection efficiency of sunlight, while maintaining the lightness of the system structure and high cost performance;

(4) Using CSP vacuum metal straight-through tube as the receiver, on the one hand, it can achieve effective heat collection and heat preservation, on the other hand, it is convenient for series connection between heat collectors to form an effective array, providing industrial and commercial applications;

(5) The organic combination of the ring-shaped support structure and the stepping motor tracking structure is used, which is beneficial to the principle of leverage and reduces the driving power consumption of the tracking system. At the same time, it is convenient to use one tracking device to drive the array composed of multiple heat collecting devices Not only energy saving but also cost saving.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model.

The marks in the drawings and the names of corresponding parts: 1—mounting base; 2—receiver; 3—tracking system; 4—main reflector; 5—rotation shaft; 6—rotation sleeve; 7—circular bracket; 8—horizontal bracket; 9—secondary reflector; 10—V-shaped bracket.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example:

As shown in Figure 1, the utility model is mainly composed of a mounting base 1 and a receiver 2 arranged on the top of the mounting base 1, the receiver 2 is provided with a Fresnel line focusing reflector to form a main reflector 4, The serrated surface of the main reflector 4 is a coating layer, and the other side is a sunny surface. The material of the main reflector 4 can be transparent polymethyl methacrylate (PMMA) or glass, etc., and the concentration ratio is between 50 and 100. Between; the utility model adopts this structure, because the light surface of the main reflector 4 faces sunlight, effectively overcomes the problem of dust accumulation caused by facing the sunlight with the toothed surface, improves the heat collection efficiency of the system, and reduces maintenance costs.

The main reflector 4 is mainly assembled by at least two Fresnel line focusing reflectors, and all Fresnel line focus reflectors are located in the same plane. With this assembled structure, the traditional one-piece reflector can be achieved. The heat collection effect of the plate is convenient for the transportation, installation and maintenance of the whole heat collection device, which reduces the transportation cost, installation cost and maintenance cost; and because the mold cost of the whole plate is very high, the production cost is also high, and the assembled The way can greatly reduce the manufacturing cost.

The upper end of the mounting seat 1 is provided with a rotating shaft 5, and a rotating sleeve 6 is set on the rotating shaft 5, and the receiver 2 is arranged on the rotating shaft 5 along the axis of the rotating shaft 5; the main reflector 4 passes through the main bracket Connected to the rotating sleeve 6, due to the adoption of this structure, the main bracket can fix and support the main reflector 4 on the mounting seat 1, and can rotate around the installation center line of the receiver 2 as the axis.

Further, the above-mentioned main support adopts an annular support 7 with an upward opening, and the two ends of the annular support 7 are connected to the rotating sleeve 6 through a transverse support 8; the main reflector 4 is arranged on the annular support 7 on the inner circle; the ring-shaped support 7 is connected to the tracking system 3 that drives it to rotate, and the tracking system 3 is mainly composed of a stepping motor, a gear connected to the stepping motor, and a ring gear meshed with the gear. The ring gear is installed on the inner surface of the annular support 7; due to the adoption of this structure, the main support and the tracking system 3 are organically combined, which is beneficial to the principle of leverage, and the driving power consumption of the tracking system 3 is reduced. It is convenient to use one set of tracking device to drive the array composed of multiple sets of heat collecting devices, which not only saves energy but also saves cost.

A Fresnel line focusing reflector is arranged above the receiver 2 to form a sub-reflector 9. The toothed surface of the sub-reflector 9 is a coating layer, and the toothed surface is a reflecting surface. The mirror 4 is parallel, and the material of the secondary reflector 9 can also be transparent polymethyl methacrylate (PMMA) or glass, etc., and the concentration ratio is between 5 and 10; the secondary reflector 9 plays the role of secondary reflection, effectively Improve the collection efficiency of sunlight while maintaining the lightness of the system structure, which is cost-effective.

The above-mentioned secondary reflector 9 is fixed on the mounting seat 1 through a secondary bracket, the secondary bracket is formed of a V-shaped bracket 10, and the lower end of the V-shaped bracket 10 is connected to the rotating sleeve 6, and the secondary reflector 9 is installed on the V-shaped bracket 10. The upper end of the shaped support 10; due to the adoption of this structure, the secondary support can fix the secondary reflector 6 on the mounting seat 1, and can rotate with the main support with the center line of the receiver 2 as the axis, so that not only can the The consumption of driving power is further reduced, and the synchronization of the rotation of the primary reflector 4 and the secondary reflector 9 can be enhanced.

The receiver 2 is a CSP vacuum metal straight-through tube, and the CSP vacuum metal straight-through tube is used as the receiver 2. On the one hand, it can achieve effective heat collection and heat preservation, and on the other hand, it is convenient for series connection between heat collectors to form an effective array, providing industrial and commercial applications.

The above-mentioned tracking system 3 adopts a single-axis automatic tracking system, and the control method is preset program control, that is, the position and angle of the reflector are calculated according to the sun's operation law, and the movement of the mirror axis is controlled through the movement of the gear rotation mechanism linked with the stepping motor. Reach the tracking effect; the tracking system 3 drives the main support and the secondary support to rotate through the stepping motor, and then drives the main reflector 4 and the secondary reflector 9 to rotate, thereby realizing the tracking of the sun. The tracking angle of the tracking system 3 is 60° from east to west. ℃.

The utility model extends along the north-south direction. The receiver 2 is located between the main reflector 4 and the secondary reflector 6. The mounting base 1 supports the main support, the secondary support and the receiver 2 and is installed on the ground. Tracking adjustment; the main reflector 4 gathers solar energy to the receiver 2 through high-magnification line focusing, and the secondary reflector 6 refocuses part of the scattered light of the main reflector 4 on the receiver 2; several receivers 2 are connected in series to form a user terminal For the thermal fluid circuit, the heat collecting medium can be water or high temperature resistant mineral oil, etc.

As mentioned above, the utility model can be better realized.

Claims (10)

1. The Fresnel medium-high temperature solar heat collection device is mainly composed of a mounting base (1) and a receiver (2) arranged on the upper end of the mounting base (1). It is characterized in that the lower part of the receiver (2) A Fresnel line focusing reflector is provided to form a main reflector (4), and the serrated surface of the main reflector (4) is a coating layer, and the other side is a sun-facing surface. 2. The Fresnel medium-high temperature solar heat collection device according to claim 1, characterized in that, the main reflector (4) is mainly composed of at least two Fresnel line focusing reflectors, and all the Fresnel The Niell line focusing mirrors are all located in the same plane. 3. The Fresnel medium-high temperature solar heat collection device according to claim 1, characterized in that, the upper end of the mounting seat (1) is provided with a rotating shaft (5), and a rotating sleeve is placed on the rotating shaft (5) The barrel (6), the receiver (2) is arranged on the rotating shaft (5) through the axis of the rotating shaft (5); the main reflector (4) is connected to the rotating sleeve (6) through the main bracket. 4. The Fresnel medium-high temperature solar heat collection device according to claim 3, characterized in that, the main support is mainly composed of an annular support (7) with an upward opening, and the annular support (7) Both ends are connected to the rotating sleeve (6) through a transverse bracket (8); the main reflector (4) is arranged on the inner surface of the ring-shaped bracket (7). 5. The Fresnel medium-high temperature solar heat collection device according to claim 4, characterized in that it also includes a tracking system (3), the tracking system (3) is mainly composed of a stepping motor, and a stepping motor The gear and the ring gear meshed with the gear are formed, and the ring gear is installed on the inner surface of the ring-shaped bracket (7). 6. The Fresnel medium-high temperature solar heat collection device according to any one of claims 1-5, characterized in that a Fresnel line focusing reflector is arranged above the receiver (2) to form a secondary reflector (9), and the serrated surface of the secondary reflector (9) is a coating layer, and the serrated surface is a reflective surface. 7. The Fresnel medium-high temperature solar heat collection device according to claim 6, characterized in that, the upper end of the mounting seat (1) is provided with a rotating shaft (5), and a rotating sleeve is placed on the rotating shaft (5) The barrel (6), the receiver (2) is arranged on the rotating shaft (5) through the axis of the rotating shaft (5); the secondary reflector (9) is connected to the rotating sleeve (6) through the secondary bracket. 8. The Fresnel medium-high temperature solar heat collection device according to claim 7, characterized in that, the secondary support is mainly composed of a V-shaped support (10), and the lower end of the V-shaped support (10) is connected to a rotating on the sleeve (6); the secondary reflector (9) is installed on the upper end of the V-shaped bracket (10). 9. The Fresnel medium-high temperature solar heat collection device according to claim 8, characterized in that, the material of the primary reflector (4) and the secondary reflector (6) is transparent polymethyl methacrylate or glass . 10. The Fresnel medium-high temperature solar heat collection device according to claim 1, characterized in that the receiver (2) is a CSP vacuum metal straight-through pipe.

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