CN201166474Y - Calandria solar high temperature receiver - Google Patents

Abstract

The utility model discloses a tube-type solar high-temperature receiver, which belongs to the technical field of solar energy utilization. The receiver includes a heat-absorbing box with an opening at one end to let in light. The heat-absorbing box has a receiving surface and forms a heat-absorbing chamber. The heat-absorbing box is covered with an insulating layer and an outer shell. A receiving pipe. One end of the receiving pipe is the working medium inlet passing through one side of the heat-absorbing box, and the other end is the working medium outlet passing through the other side of the heat-absorbing box. Due to the reasonable arrangement of the receiving tubes, good heat transfer performance, simple manufacture and low cost, the solar receiver is convenient for large-scale engineering application and is conducive to promoting the development of the solar heat utilization industry.

Description

Calandria solar high temperature receiver

technical field

The utility model relates to a solar high-temperature receiver, in particular to a tube-type solar high-temperature receiver that can be used in a solar thermal power generation system, and belongs to the technical field of solar energy utilization.

Background technique

Solar thermal power generation is an effective way to solve current energy problems. The receiver is the core device of the solar thermal power generation system. Existing high-temperature solar receivers can be divided into two types: external light-receiving type and cavity type. In contrast, the former has a greater heat loss and a lower temperature, generally below 600 degrees; while the cavity-type receiver has a higher temperature, which is suitable for high-temperature solar thermal power generation with a high concentration ratio, such as tower-type and dish-type solar thermal power generation system. The development trend of the cavity receiver is: the temperature parameter of the working medium is getting higher and higher, which is more suitable for the modern gas turbine power generation cycle with high temperature parameters.

At present, the cavity type receiver is mostly used in the world, and its light-to-heat conversion rate can reach more than 90%. Among them, the dish solar thermal power generation has a high concentration ratio, generally between 500 and 6000, so the energy per unit area reaching the receiver is very high. Due to the uneven distribution of light receiving and cold fluid in the existing receivers of this type, "hot spots" are easily generated in the receiver, which can damage the receiver in the slightest, or destroy the entire system in severe cases, resulting in safety accidents. Therefore, dish solar thermal power generation is subject to The technical problem of the receiver makes it difficult to popularize and apply.

Utility model content

The purpose of this utility model is: to solve the above existing problems in the prior art, to propose a tube-type solar high-temperature receiver with reasonable and uniform distribution of light and cold fluid, so as to eliminate the "hot spot" phenomenon and make it practical for popularization and application.

In order to achieve the above object, the technical solution of the present invention is: a tube-type solar high-temperature receiver, comprising a heat-absorbing box with an opening at one end to let in light, and the heat-absorbing box has a receiving surface and forms a heat-absorbing chamber, so The heat-absorbing box is covered with an insulating layer and a shell, and a set of receiving pipes passes through the heat-absorbing cavity of the heat-absorbing box, and one end of the receiving pipe is the inlet of the working medium passing through the side of the heat-absorbing box. The other end is the working medium outlet passing through the other side of the heat-absorbing box.

The further improvement of the utility model is that the receiving pipe is provided with fins to increase the receiving area.

In this way, through the rational design of the tube structure, the problem of uniform distribution of light receiving and cold fluid in the solar high temperature receiver is solved, and the "hot spot" phenomenon is eliminated. It not only has the advantages of good heat transfer performance, but also is simple to manufacture and low in cost. , so it is convenient for large-scale engineering application and is conducive to promoting the development of solar thermal utilization industry.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a structural schematic diagram of Embodiment 1 of the utility model.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the utility model.

Fig. 3 is a schematic structural view of Embodiment 3 of the present utility model.

Fig. 4 is a schematic structural diagram of Embodiment 4 of the present utility model.

Fig. 5 is a schematic structural diagram of Embodiment 5 of the present utility model.

Fig. 6 is a schematic structural diagram of Embodiment 6 of the present utility model.

Detailed ways

Embodiment one

As shown in Figure 1, the tube-type solar high-temperature receiver of this embodiment has a heat-absorbing cavity 1 formed in the heat-absorbing box body 3, and a receiving surface 2 is provided in the heat-absorbing cavity, and the heat-absorbing box body 3 is covered with an insulating layer and an outer shell. 4. One end of the heat-absorbing box body 3 is open, and transparent glass 8 is housed.

The receiving surface 2 is essentially composed of seven receiving tubes 7 (the number of receiving tubes 7 can be set according to specific needs), each receiving tube is a straight circular tube, arranged in parallel along the arc surface, running through the heat-absorbing chamber 1, and the internal flow has One end of the working medium is the working medium inlet 5, which passes through one side of the heat-absorbing box body 3, and the other end is the working medium outlet 6, which passes through the other side of the heat-absorbing box body. All there is the fin that increases its receiving area on each receiving pipe 7 . The fins can be arranged in parallel or in a helical structure. They can be formed simultaneously with the receiving tube during processing, or they can be tightly sleeved on the receiving tube 7 by hot pressing. The surface of the receiving tube 7 and its fins is coated with a high temperature solar absorbing coating 10 .

The plane transparent glass cover 8 is sealed and connected with the opening of the heat-absorbing box 3 to form a sealed cavity. During use, the inside of the heat-absorbing chamber is evacuated or filled with inert gas (such as nitrogen, etc.) through the vacuuming pipeline 9 to protect the high-temperature solar absorbing coating 10 and reduce the heat loss of the solar receiver. Plane transparent glass cover 8 also can be replaced by concave glass or convex glass. The outside of the heat-absorbing chamber 1 is covered by the insulation layer and the shell 4, which not only reduces the heat exchange between the heat-absorbing chamber and the outside air, further reduces the heat loss of the solar receiver, but also fixes and strengthens the box structure of the receiver.

In this embodiment, the outside of the transparent glass cover at the opening end of the heat-absorbing cavity is also provided with a CPC composite material curved surface concentrator 11 made up of multiple reflectors, which increases the incident light angle at which the solar receiver receives sunlight, and the receiving tube 7 and its The high-temperature solar absorbing coating 10 on the fin increases the absorption ratio of the solar receiver, and through the CPC concentrator 11 and the high-temperature solar absorbing coating 10, the light-heat loss of the solar high-temperature receiver is reduced, making its light-to-heat conversion rate greatly improved.

In order to enhance the heat exchange effect between the receiving pipe 7 and the working medium flowing inside, a spiral spoiler structure can be added in the receiving pipe 7 to increase the heat exchange area between the working medium and the receiving pipe 7 and enhance the heat exchange performance of the receiver , to further increase the outlet temperature of the working medium.

Due to the rational design of the tube-type solar high-temperature receiver of the utility model, the manufacture is simple and the cost is low, which is beneficial to the large-scale production of the tube-type solar high-temperature receiver and will promote the development of solar thermal power generation technology .

Embodiment two

The basic structure of this embodiment is basically the same as that of Embodiment 1, the main difference is that the receiving tubes forming the receiving surface 2 of the receiver are arranged in a planar arrangement instead of an arc surface.

As shown in FIG. 2 , the seven receiving pipes are in a straight line and run through the heat-absorbing cavity 1 in parallel along the same plane. According to needs, the receiving pipe 7 can also be parallelly inserted into the heat absorption cavity 1 along different planes.

Since the receiving tubes 7 of the tube-type solar high-temperature receiver in this embodiment are arranged in a plane, the processing and manufacturing are simpler, the cost can be further reduced, and engineering popularization and application are facilitated.

Embodiment three

The basic structure of this embodiment is substantially the same as that of Embodiment 1, the main difference being that the receiving tube forming the receiving surface 2 of the receiver is changed from a straight circular tube to a curved circular tube.

As shown in Figure 3, seven receiving tubes 7 are bent in a curved shape and run side by side through the heat-absorbing cavity 1. This structure further increases the receiving area by bending the receiving tubes 7, which further improves the heat transfer performance of the receiver. .

The calandria-type solar high temperature receiver of this embodiment adopts a curved receiving tube, which significantly improves the heat exchange performance and cost performance of the receiver with little increase in cost, and is conducive to the scale-up of the solar high temperature receiver application.

Embodiment Four

The basic structure of this embodiment is basically the same as that of Embodiment 1, the main difference is that the receiving tube forming the receiving surface 2 of the receiver is changed from a circular tube structure to a tube with a special-shaped cross-section.

As shown in FIG. 4 , the receiving tube 7 used in this embodiment is a rectangular tube with a diamond cross section, and seven rectangular tubes are arranged side by side in parallel in the heat-absorbing chamber. In fact, in the process of processing, according to the needs of different types of receivers, different structures such as flat tubes and oval tubes can also be used.

The tube-type solar high-temperature receiver of this embodiment adopts a receiver with a rectangular tubular structure, which is easy to process and manufacture, which is beneficial to reduce the cost of the solar high-temperature receiver and is convenient for engineering promotion.

Embodiment five

The basic structure of this embodiment is basically the same as that of Embodiment 4, the main difference is that the receiving tube forming the receiving surface 2 of the receiver is a special-shaped cross-section tube with a fin structure.

As shown in Figure 5, the receiving tube 7 adopted in this embodiment is a rectangular tubular structure, and seven rectangular tubular structures are arranged side by side in parallel in the heat-absorbing chamber 1, wherein each receiving tube 7 has a receiving tube to increase its receiving capacity. Fins with a large area, the fins are columnar structures inserted into the inside of the receiving tube 7 . When designing, the size and density of the columnar fins can be determined according to the specific design parameters of the receiver.

The rectangular tube-shaped receiving tube used in the tube-type solar high-temperature receiver of this embodiment is not only easy to manufacture, but also because of the columnar fin structure inserted into the receiving tube, the heat transfer performance of the receiver is improved to a certain extent, further improving The cost performance of the receiver.

Embodiment six

The basic structure of this embodiment is substantially the same as that of the fifth embodiment, the main difference being that the receiving tube forming the receiving surface 2 of the receiver changes from a rectangular tube structure to a curved square tube structure.

As shown in Figure 6, the receiving tube 7 used in this embodiment is bent into a curved shape and runs through the heat-absorbing cavity 1. This structure further increases the receiving area by bending the receiving tube 7, so that the heat exchange of the receiver Performance has been further improved.

The calandria-type solar high temperature receiver of this embodiment significantly improves the heat exchange performance and cost performance of the receiver with a small increase in cost due to the use of curved receiver tubes.

The above six embodiments have all adopted the same pipe as the receiving pipe, and of course different types of pipes can be used as the receiving pipe. For example, in the fourth embodiment, two round pipes, two square pipes, and three elliptical pipes can be used. Shaped tubes and other similar transformations, the fin structure on each tube is not necessarily the same size and shape, and different sizes and structures can be used, for example, the height and thickness of the fins decrease from the middle to both sides, while the density of the distribution increases and other similar variations, all of which are within the protection scope of the present utility model.

Claims (9)

1. calandria solar energy high-temperature receiver, comprise that an end opening advances the heat absorption casing of light, have receiving plane and form heat-absorbing chamber in the described heat absorption casing, external heat-insulation layer and the shell of being surrounded by of described endothermic box, it is characterized in that: pass through a group of received pipe in the heat-absorbing chamber of described heat absorption casing, the working media inlet of one end of described receiving tube for passing from heat absorption casing one side, the working media outlet of the other end for passing from heat absorption casing opposite side.

2. calandria solar energy high-temperature receiver as claimed in claim 1 is characterized in that: described receiving tube is provided with the fin that increases receiving area.

3. calandria solar energy high-temperature receiver as claimed in claim 2, it is characterized in that: the opening part of described heat absorption casing is equipped with transparent glass cover, the described transparent glass cover outside is provided with the concentrator that is made of one group of speculum, vacuumizes in the described heat-absorbing chamber or is full of inert gas.

4. calandria solar energy high-temperature receiver as claimed in claim 3 is characterized in that: described receiving tube and fin surface scribble high temperature solar and select absorber coatings.

5. calandria solar energy high-temperature receiver as claimed in claim 4 is characterized in that: described fin is arranged in parallel, and hot pressing tightly is enclosed within on the receiving tube.

6. calandria solar energy high-temperature receiver as claimed in claim 4 is characterized in that: described fin is a helical structure, is connected as a single entity with receiving tube.

7. as claim 5 or 6 described calandria solar energy high-temperature receivers, it is characterized in that: described receiving tube is a pipe, is arranged in parallel along cambered surface or staggered floor.

8. as claim 4 described calandria solar energy high-temperature receivers, it is characterized in that: described fin is a column structure, is connected as a single entity with receiving tube.

9. as claim 8 described calandria solar energy high-temperature receivers, it is characterized in that: straight square tube that described receiving tube is arranged side by side or Qu Fangguan.

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