CN105423573B - A kind of solar focusing heat collector being reflected down - Google Patents

Abstract

The present invention proposes a downwardly reflecting solar energy focusing heat collection device, comprising: a rotating parabolic mirror (1), a rotating parabolic heliostat with a transmission hole (2), a cylindrical mirror (3), and a compound parabolic mirror (4) , sunlight receiver (5) and support frame (6); the rotating parabolic mirror (1) is inverted and placed on the rotating parabolic heliostat (2) with a transmission hole, the cylindrical mirror (3), the compound paraboloid The mirror (4) and the sunlight receiver (5) are placed directly below the transmission hole (201) of the rotating parabolic heliostat (2) with the transmission hole; The heliostat (2) is reflected on the inverted rotating parabolic mirror (1), and then reflected downwards by it into a parallel beam passing through the transmission hole (201) to the compound parabolic mirror (4) directly below it, and finally reflected On the solar heat collector (5), realize the downward focusing reflection of sunlight.

Description

A Downward Reflecting Solar Concentrating Heat Collector

technical field

The invention belongs to the technical field of solar energy utilization, and in particular relates to a downward-reflecting solar energy focusing heat-collecting device.

Background technique

Solar energy has the advantages of being clean, non-polluting, available anywhere, and inexhaustible, so the development, utilization and conversion of solar energy has become a hot spot of concern; in the utilization technology of solar energy, photothermal conversion technology is widely used , it converts solar radiation energy into thermal energy and utilizes it; at present, the low-temperature thermal utilization of solar energy is developing rapidly, such as solar water heaters; and the high-temperature thermal utilization technology of solar energy has very broad application prospects, such as solar thermal power generation and high-temperature heating, so It is of great significance to study new solar high-temperature heat collectors to improve the utilization level of solar energy.

The existing dish-type solar heat-collecting device uses a rotating parabolic mirror to focus the sunlight on its focus, and the solar receiver is placed on the focus of the rotating parabolic mirror to absorb heat; however, the dish-type solar heat-collecting device exists The following disadvantages: Since the solar receiver in the dish solar collector is placed on the focus of the rotating parabolic mirror, the solar receiver needs to rotate with the rotating parabolic mirror to track the sun, so it is difficult to store heat.

The existing literature (patent number: ZL201210016607.X) proposes a solar focusing high-temperature heat collection device at the bottom of the reflecting tower. The device uses multiple heliostats to focus and reflect sunlight to the top of the reflecting tower, and then uses Mirrors, conical mirrors, inverted compound parabolic mirrors, cylindrical mirrors and compound parabolic mirrors reflect the sunlight from the top of the tower to the solar receiver at the bottom of the tower to realize heat collection, heat storage and heat exchange at the bottom of the tower; However, the device has a complex structure and a large footprint, and is suitable for large-scale heat collection.

Contents of the invention

In order to solve the above problems, the present invention proposes a downwardly reflecting solar energy focusing and heat collecting device, which consists of a rotating parabolic mirror (1), a rotating parabolic heliostat with a transmission hole (2), a cylindrical mirror (3) , a composite parabolic mirror (4), a sunlight receiver (5) and a support frame (6); the sunlight is focused and reflected by the rotating parabolic heliostat (2) with transmission holes to the inverted rotating parabolic mirror (1) , and then the sunlight is reflected by the rotating parabolic mirror (1) into a vertically downward parallel beam, and the parallel beam passes through the transmission hole (201) with a diameter of D on the rotating parabolic heliostat (2) with a transmission hole to reach its On the compound parabolic mirror (4) directly below, the compound parabolic mirror (4) focuses and reflects the parallel light beams to the sunlight receiver (5), so as to realize the focused heat collection of sunlight on the ground, and at the same time heat storage and heat transfer are also possible. It can be carried out on the ground, which can simplify the structure, reduce power consumption, reduce heat loss, simplify the process, and facilitate high-temperature heat storage, and is suitable for applications such as solar thermal power generation and high-temperature heating.

The feature of the above-mentioned downward reflecting solar energy concentrating heat collecting device is: the sunlight reflected by the rotating parabolic heliostat (2) with the transmission hole on the rotating parabolic mirror (1) is captured by the rotating parabolic mirror (1) ) is reflected downward through the transmission hole (201) with a diameter of D on the rotating parabolic heliostat (2) with the transmission hole, and reaches the compound parabolic mirror (4) below it, and is then compounded by the compound parabolic mirror (4) Reflected to the sunlight receiver (5), heat collection, heat storage and heat exchange can all be carried out on the ground, which has the advantages of simple structure, easy implementation, safety and reliability, and heat collection on the ground can save power consumption.

In order to achieve the above object, the present invention adopts the following technical solutions:

The rotating parabolic mirror (1) is placed upside down on the rotating parabolic heliostat (2) with a transmission hole, and the central rotation axis of the rotating parabolic mirror (1) is vertically downward, and the rotating parabolic mirror (1) and the belt The focus of the rotating parabolic heliostat (2) with the transmission hole coincides; the cylindrical mirror (3), the compound parabolic mirror (4) and the sunlight receiver (5) are placed in the rotating parabolic heliostat (2) with the transmission hole ) directly below the transmission hole (201); a rotating parabolic mirror (1), a rotating parabolic heliostat with a transmission hole (2), a cylindrical mirror (3), a compound parabolic mirror (4) and a solar receiver ( 5) It is fixed on the support frame (6) and can rotate together with the support frame (6); the rotating parabolic heliostat (2) with a transmission hole in operation focuses and reflects the sunlight to the rotating parabolic mirror above it (1 ), the reflected sunlight points to a fixed point above the rotating parabolic heliostat (2) with a transmission hole, the fixed point is the rotating parabolic heliostat (2) and the rotating parabolic mirror ( The common focal point A of 1); the rotating parabolic mirror (1) reflects sunlight into a vertically downward parallel beam, and the parallel beam passes through the transmission hole with a diameter of D on the rotating parabolic heliostat (2) with a transmission hole (201), reaching the compound parabolic mirror (4) below it, and the compound parabolic mirror (4) focuses and reflects the parallel light beams onto the sunlight receiver (5), so as to realize the focused heat collection of sunlight.

The propagation process of the entire optical path is: sunlight is reflected by the rotating parabolic heliostat with transmission holes (2), passes through the common focus A of the rotating parabolic mirror (1) and the rotating parabolic heliostat with transmission holes (2), and reaches the inverted on the rotating parabolic mirror (1), and then reflected downward by the rotating parabolic mirror (1) into a parallel beam passing through the transmission hole (201) of the rotating parabolic heliostat (2) with a transmission hole, and reaching the compound directly below it On the parabolic mirror (4), the parallel light beam is finally focused and reflected by the compound parabolic mirror (4) onto the solar heat collector (5), so as to realize the downward focused reflection of sunlight.

The beneficial effects of the present invention are:

The solar receiver (5) is placed on the ground below the rotating parabolic heliostat (2) with a transmission hole, and the heated medium does not need to be pumped to the top of the rotating parabolic heliostat (2) with a transmission hole for heating. Heat absorption, so it can reduce power consumption, reduce heat collection loss, simplify heat transfer process, reduce cost, and improve reliability; at the same time, heat collection, heat storage and heat exchange can all be carried out on the ground, which is conducive to high-temperature heat storage and heat reduction. loss.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Figure 1 is the light path diagram of the proposed downward reflecting solar concentrating heat collector.

Fig. 2 is a position diagram of the transmission hole (201) of the rotating parabolic heliostat (2) with the transmission hole.

Fig. 3 is a composition diagram of the proposed downward reflecting solar energy concentrating heat collector.

In the figure: (1)—rotating parabolic mirror; (2)—rotating parabolic heliostat with transmission hole (201); (3)—cylindrical mirror; (4)—composite parabolic mirror; (5)—sunlight Receiver; (6)—support frame; (201)—transmission hole (201); A—common focus of rotating parabolic heliostat (2) and rotating parabolic mirror (1) with transmission hole; D—transmission hole ( 201) diameter.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, it is a diagram of a downwardly reflecting solar energy concentrating heat collector, including a rotating parabolic mirror (1), a rotating parabolic heliostat with a transmission hole (2), and a cylindrical mirror (3) , a composite parabolic mirror (4), a solar receiver (5) and a support frame (6); the rotating parabolic mirror (1) is placed upside down on the rotating parabolic heliostat (2) with a transmission hole, so that the rotating parabolic The central rotation axis of the mirror (1) is vertically downward, so that the focal points of the rotating parabolic mirror (1) and the rotating parabolic heliostat with a transmission hole (2) coincide; the cylindrical mirror (3), the compound parabolic mirror (4) and the sunlight receiver (5) are placed directly below the transmission hole (201) of the rotating parabolic heliostat (2) with the transmission hole; the rotating parabolic mirror (1), the rotating parabolic heliostat ( 2), cylindrical mirror (3), compound parabolic mirror (4) and sunlight receiver (5) are fixed on the support frame (6), and can rotate together with support frame (6); It is reflected by the rotating parabolic heliostat with transmission hole (2), passes through the common focus A of the rotating parabolic mirror (1) and the rotating parabolic heliostat with transmission hole (2), and reaches the inverted rotating parabolic mirror (1) , and then reflected downward by the rotating parabolic mirror (1) into a parallel beam, passing through the transmission hole (201) on the rotating parabolic heliostat mirror (2) with a transmission hole, and reaching the compound parabolic mirror (4) directly below it , and finally the compound parabolic mirror (4) focuses and reflects the parallel light beams onto the solar collector (5), so as to realize the downward focusing and reflection of sunlight.

As shown in Figure 2, it is the position diagram of the transmission hole (201) of the rotating parabolic heliostat (2) with the transmission hole, the transmission hole on the rotating parabolic heliostat (2) with the transmission hole in Figure (a) The position of (201) and the size of the diameter D are determined by the position between the rotating parabolic mirror (1) and the rotating parabolic heliostat with a transmission hole (2), which can be determined by the drawing method shown in figure (b) ; Its design method is: the sun's rays are made at the edge of the mirror surface of the rotating parabolic heliostat (2) with the transmission hole, and the sun's rays are reflected to the rotating parabolic heliostat (2) with the transmission hole through the rotating parabolic mirror (1) again. 2), the position of the solar rays reflected on the rotating parabolic heliostat (2) with the transmission hole is all included in the scope of the transmission hole (201), and can pass through the transmission hole (201), by This determines the position of the transmission hole (201) and the size of the diameter D; thus all the light rays reflected by the rotating parabolic heliostat (2) with the transmission hole can pass through after being reflected downward by the rotating parabolic mirror (1). Continue to reflect downward through the transmission hole (201).

As shown in Figure 3, with the apex of the revolving parabolic mirror (1) as the origin, a Cartesian coordinate system is established. The surface equation is as follows:

The surface equation of the rotating parabolic mirror (1) is: focus

The surface equation of the rotating parabolic heliostat (2) with a transmission hole is:

The surface equation of the compound parabolic mirror (4) is:

Above: A ₁ and A ₂ are both constants greater than 0; B ₂ and B ₃ — are lengths, m.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (1)

1. A downwardly reflecting solar energy focusing heat collector, comprising a rotating parabolic mirror (1), a rotating parabolic heliostat (2) with a transmission hole, a cylindrical mirror (3), a compound parabolic mirror (4), a sun A light receiver (5) and a support frame (6); it is characterized in that: the rotating parabolic mirror (1) is placed upside down on the rotating parabolic heliostat (2) with a transmission hole, so that the rotating parabolic mirror (1) The central rotation axis is vertically downward, so that the focal points of the rotating parabolic mirror (1) and the rotating parabolic heliostat with transmission holes (2) coincide; the cylindrical mirror (3), the compound parabolic mirror (4) and the solar receiver (5) Placed directly below the transmission hole (201) of the rotating parabolic heliostat (2) with a transmission hole; the rotating parabolic mirror (1), the rotating parabolic heliostat (2) with a transmission hole, the cylindrical The mirror (3), compound parabolic mirror (4) and sunlight receiver (5) are fixed on the support frame (6), and can rotate together with the support frame (6); In operation, sunlight is reflected by the rotating parabolic heliostat with transmission holes (2), passes through the common focus A of the rotating parabolic mirror (1) and the rotating parabolic heliostat with transmission holes (2), and reaches the inverted rotating on the parabolic mirror (1), and then reflected downward by the rotating parabolic mirror (1) into a parallel beam, passing through the transmission hole (201) on the rotating parabolic heliostat (2) with a transmission hole to reach the compound parabola directly below it On the mirror (4), the parallel light beam is focused and reflected to the sunlight receiver (5) by the compound parabolic mirror (4) at last, so as to realize the downward focused reflection of sunlight; The position and the size of the diameter D of the transmission hole (201) on the rotating parabolic heliostat (2) with the transmission hole are determined by the distance between the rotating parabolic mirror (1) and the rotating parabolic heliostat (2) with the transmission hole The position is determined; the design method is: make the sun's rays at the edge of the mirror surface of the rotating parabolic heliostat (2) with a transmission hole, and reflect the sun's rays again to the rotating parabolic heliostat with a transmission hole through the rotating parabolic mirror (1) On the mirror (2), the position of the sunlight reflected on the rotating parabolic heliostat (2) with the transmission hole is included in the scope of the transmission hole (201), and can pass through the transmission hole (201). , thereby determining the size of the position of the transmission hole (201) and the diameter D; The equations of the rotating parabolic mirror (1), the rotating parabolic heliostat with transmission holes (2) and the compound parabolic mirror (4) are as follows: The surface equation of the rotating parabolic mirror (1) is: focus The surface equation of the rotating parabolic heliostat (2) with a transmission hole is: The surface equation of the compound parabolic mirror (4) is: Above: A ₁ and A ₂ are both constants greater than 0; B ₂ and B ₃ — are lengths, m.