CN104567028B - Heat-transferring improved heat-storage solar energy heat collector - Google Patents

Abstract

The invention discloses a thermal storage type solar heat collecting device with improved heat transfer. Including cold fluid inlet pipe, annular shunt chamber, enhanced heat exchange pipe, heat collection chamber, heat storage body, hot fluid outlet pipe, confluence chamber, insulation layer, lens; Cavity, heat storage body, enhanced heat exchange tube, the lower end of the enhanced heat exchange tube is connected to the annular shunt cavity, the annular shunt cavity is connected to the cold fluid inlet pipe, the upper end of the enhanced heat exchange tube is connected to the confluence cavity, and the confluence cavity is connected to the hot fluid outlet pipe , A lens is installed at the mouth of the heat collecting chamber, and an insulation layer is laid outside the cold fluid inlet pipe, the annular shunt chamber, the enhanced heat exchange pipe, the heat storage body, and the confluence chamber. In the present invention, by adding strengthening fins and optimizing the structure of the heat storage body, on the basis of ensuring the integrated design of heat absorption, heat storage and heat exchange of the solar collector, the design of the pipeline is simplified, and the heat storage body is strengthened. Excellent thermal conductivity reduces the radial temperature difference of the heat storage body and improves the reliability of the system.

Description

Improved heat transfer heat storage type solar heat collector

technical field

The invention relates to a thermal storage type solar heat collecting device with improved heat transfer, which belongs to the technical field of solar heat utilization.

Background technique

At present, traditional energy reserves are decreasing day by day, and the problem of environmental pollution is increasing day by day. The development and utilization of renewable energy such as solar energy can not only provide huge energy for human society, but also save conventional fossil fuels and protect the ecological environment. Therefore, the development and utilization of solar energy resources has long been valued by countries all over the world, and has become an important direction of energy development in my country. The stable operation of solar thermal utilization system has brought great challenges. The excess solar heat can be temporarily stored through the solar heat storage system, and released when there is no sunshine or insufficient sunshine, thus ensuring the safety and stability of the entire solar thermal utilization system.

Currently common solar heat storage systems include phase change latent heat storage and sensible heat storage. In many cases, the arrangement of heat exchange pipes on the surface of the heat storage body does not satisfy the design snowball. It is often required to install heat exchange pipes inside the heat storage body, which greatly increases the processing procedures and difficulties of the heat storage body, and the pipes are too long. The heat transfer temperature difference of the heat exchanger itself also increases, and there are many problems in the maintenance of the pipeline.

Therefore, the solar thermal utilization system has room for further improvement and improvement in terms of optimizing the pipeline structure, realizing long-term stable and safe operation of solar heat collectors, and improving the utilization rate of solar energy.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings, and propose a thermal storage type solar heat collector with improved heat transfer.

To achieve the above object, the present invention adopts the following technical solutions:

The improved heat transfer heat storage type solar heat collector includes a cold fluid inlet pipe, an annular shunt chamber, an enhanced heat exchange pipe, a heat collection chamber, a heat storage body, a hot fluid outlet pipe, a confluence chamber, an insulation layer, and a lens;

The body of the heat collecting device is provided with a heat collecting chamber, a heat storage body, and an enhanced heat exchange tube in sequence from the inside to the outside. The upper end is connected with the confluence chamber, the confluence chamber is connected with the hot fluid outlet pipe, the lens is installed at the mouth of the heat collection chamber, the cold fluid inlet pipe, the annular shunt chamber, the enhanced heat exchange tube, the heat storage body, and the confluence chamber are all laid with insulation layer;

The heat accumulator includes a heat accumulator body, a semicircular pipe groove, a first inner rib groove, and a second inner rib groove;

The outer wall of the heat storage body is evenly provided with a semicircular pipe groove, and the center of the semicircular pipe groove and the two semicircular pipe grooves are respectively provided with a first internal rib groove and a second internal rib groove;

The enhanced heat exchange tube includes a bare tube, a connecting fin plate, a first intercalated fin plate, and a second intercalated fin plate;

The light pipe is welded to the inner rib plate, the first inner rib plate is installed in cooperation with the first inner rib groove, and is closely fitted with the semicircular pipe groove, and the rib plate is connected to the second inner rib plate The plates are welded and connected, the second inserted rib plate is installed in cooperation with the second inserted rib groove, and the light pipes are respectively welded and connected to the two ends of the connecting rib plate.

The heat storage body adopts graphite or high-temperature concrete sensible heat storage material.

The thermal conductivity of the material of the connecting fin plate, the first interpolating fin plate, and the second interpolating fin plate is higher than that of the material of the heat storage body.

The slope angle of the top of the heat storage body is 30°-60°.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention realizes the integration of the solar heat collection system and the heat storage system, simplifies the layout of the pipeline and the processing structure of the heat storage body, and reduces the manufacturing cost of the system.

(2) The present invention effectively improves the temperature difference distribution of the heat storage body while increasing the heat exchange surface by adopting the method of inserting ribs and slotting on the surface of the heat storage body.

Description of drawings

Fig. 1 is a structural schematic diagram of a thermal storage type solar heat collector with improved heat transfer;

Fig. 2 is the A-A sectional view of the improved heat transfer type heat storage type solar collector;

Fig. 3 is a schematic diagram of the enhanced heat exchange tube structure of the improved heat transfer type regenerative solar heat collector;

Fig. 4 is a schematic diagram of the structure of the heat storage body of the improved heat transfer type heat storage type solar heat collector;

In the figure: cold fluid inlet pipe 1, annular distribution chamber 2, enhanced heat exchange pipe 3, heat collection chamber 4, heat storage body 5, hot fluid outlet pipe 6, confluence chamber 7, insulation layer 8, lens 9, heat collection pipe 10 , Connecting rib plate 11, first inner rib plate 12, second inner rib plate 13, heat storage body 14, semicircular pipe groove 15, first inner rib groove 16, second inner rib groove Road 17.

detailed description

As shown in Figures 1 and 2, the improved heat transfer heat storage type solar heat collector includes a cold fluid inlet pipe 1, an annular shunt chamber 2, an enhanced heat exchange pipe 3, a heat collection chamber 4, a heat storage body 5, and a hot fluid outlet Tube 6, confluence chamber 7, insulation layer 8, lens 9;

The body of the heat collector is provided with a heat collection chamber 4, a heat storage body 5, and an enhanced heat exchange tube 3 in sequence from the inside to the outside. The lower end of the enhanced heat exchange tube is connected to the annular distribution chamber 2, and the annular distribution chamber is connected to the cold fluid inlet pipe 1 , the upper end of the enhanced heat exchange tube is connected with the confluence cavity 7, the confluence cavity is connected with the hot fluid outlet tube 6, the lens 9 is installed at the mouth of the heat collection cavity 4, the cold fluid inlet tube 1, the annular shunt cavity 2, and the enhanced heat exchange tube 3 , the thermal storage body 5, and the confluence cavity 7 are all laid with an insulating layer 8;

The heat storage body 5 includes a heat storage body 14, a semicircular pipe groove 15, a first inner rib groove 16, and a second inner rib groove 17;

The outer wall of the heat storage body 14 is evenly provided with a semicircular pipe slot 15, and the center of the semicircular pipe slot and between the two semicircular pipe slots are respectively provided with a first internal rib slot 16 and a second internal rib slot 17 ;

The enhanced heat exchange tube 3 includes a light pipe 10, a connecting fin plate 11, a first intercalated fin plate 12, and a second intercalated fin plate 13;

The light pipe 10 is welded to the inner rib plate 12, the first inner rib plate is installed in cooperation with the first inner rib groove 16, and is closely fitted with the semicircular pipe groove 15, and the rib plate 11 is connected to the second inner rib groove. The two inner rib plates 13 are welded and connected, the second inner rib plate 13 is installed in cooperation with the second inner rib groove 17 , and the light pipes 10 are respectively welded to the two ends of the connecting rib plates 11 .

The heat storage body 5 is made of graphite or high temperature concrete sensible heat storage material.

The thermal conductivity of the material of the connecting fin plate 11 , the first interpolating fin plate 12 , and the second interpolating fin plate 13 is higher than that of the material of the heat storage body 5 .

The slope angle of the top of the heat storage body 5 is 30°-60°.

Concrete work process of the present invention is as follows:

The sunlight irradiates on the reflector and focuses on the opening of the heat collecting cavity, and after being distributed by the lens, it irradiates the heat-absorbing surface of the inner wall of the heat storage body, and the temperature of the heat storage body rises after absorbing heat. The connecting fin plate, the first inserted fin plate, and the second inserted fin plate serve as enhanced heat exchange fins, which increases the heat exchange area between the light pipe and the heat storage body, and strengthens the heat exchange between the heat storage body and the light pipe. heat exchange between them. Moreover, since both the first and second inserted fin plates have relatively high thermal conductivity, the radial heat conduction of the regenerator is ensured through the first inserted fin groove and the second internal rib groove. The speed reduces the temperature difference of the heat storage body and ensures the temperature uniformity of the heat storage body. When the temperature of the regenerator rises to the heat exchange threshold temperature, the fluid in the enhanced heat exchange tube begins to be heated, and finally flows into the confluence chamber and flows out through the hot fluid outlet pipe, completing the heating process of the fluid working medium.

During the heating process, when the solar radiation changes, the device relies on the heat storage capacity of the heat storage body through the temperature change of the heat storage body, so as to ensure the relative stability of the flow rate and outlet parameters of the device. When the temperature of the regenerator exceeds the design limit, the flow rate is changed to ensure the safety and reliability of the heat exchanger.

The present invention integrates and integrates the heat absorption, heat storage and heat exchange of the solar heat collecting cavity, so that the device has a compact structure and simple pipelines, which solves the problem of unstable solar heat output. At the same time, the present invention introduces The fin-enhanced heat transfer technology is adopted, which effectively improves the heat exchange effect of the system, shortens the length of the heat exchange pipeline, reduces the cost of the device, and has considerable economic benefits.

Claims (4)

1. A heat-transfer-improved heat-storage solar heat collection device, characterized in that it includes a cold fluid inlet pipe (1), an annular shunt chamber (2), an enhanced heat exchange pipe (3), a heat collection chamber (4), Regenerator (5), thermal fluid outlet pipe (6), confluence cavity (7), insulation layer (8), lens (9); The body of the heat collection device is provided with a heat collection chamber (4), a heat storage body (5), and an enhanced heat exchange tube (3) sequentially from the inside to the outside. The chamber is connected to the cold fluid inlet pipe (1), the upper end of the enhanced heat exchange pipe is connected to the confluence chamber (7), the confluence chamber is connected to the hot fluid outlet pipe (6), and a lens (9) is installed at the mouth of the heat collection chamber (4) ), the cold fluid inlet pipe (1), the annular distribution chamber (2), the enhanced heat exchange pipe (3), the heat storage body (5), and the confluence chamber (7) are all laid with an insulation layer (8); The heat storage body (5) includes a heat storage body (14), a semicircular pipe groove (15), a first inner rib groove (16), and a second inner rib groove (17); The outer wall of the heat storage body (14) is uniformly provided with a semicircular pipe groove (15), and the center of the semicircular pipe groove and between the two semicircular pipe grooves are respectively provided with a first interpolated fin groove (16) and a second rib groove (16). Insert rib groove (17); The enhanced heat exchange tube (3) includes a light tube (10), a connecting fin plate (11), a first intercalated fin plate (12), and a second intercalated fin plate (13); The light pipe (10) is welded to the first inner rib plate (12), the first inner rib plate is fitted with the first inner rib groove (16), and is tightly connected to the semicircular pipe groove (15) Fitting, the connecting rib plate (11) is welded to the second inner rib plate (13), the second inner rib plate (13) is installed in cooperation with the second inner rib groove (17), bare pipe (10) are respectively welded with the two ends of the connecting rib plate (11). 2. A heat-transfer-improved heat-storage solar heat collector according to claim 1, characterized in that the heat-storage body (5) is made of graphite or high-temperature concrete sensible heat-storage material. 3. A heat transfer-improved heat storage type solar heat collector according to claim 1, characterized in that the connecting fin plate (11), the first interpolating fin plate (12), the second The thermal conductivity of the material of the inserted fin plate (13) is higher than that of the material of the heat storage body (5). 4. The heat transfer-improved heat storage type solar heat collector according to claim 1, characterized in that the slope angle of the top of the heat storage body (5) is 30°-60°.