CN218328709U

CN218328709U - Solar heat collection device and power generation system with same

Info

Publication number: CN218328709U
Application number: CN202222417054.0U
Authority: CN
Inventors: 郑时红; 赵云鹏; 茅新波
Original assignee: Zhejiang Yifei Technology Co ltd
Current assignee: Zhejiang Yifei Technology Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-01-17
Anticipated expiration: 2032-09-13

Abstract

The application relates to a solar heat collection device and a power generation system with the same, wherein the solar heat collection device comprises a heat absorption layer, a heat exchange tube and a heat insulation layer, the heat absorption layer is positioned above the heat exchange tube, the heat insulation layer is positioned below the heat exchange tube, and the solar heat collection device is also provided with a collecting tube and a collecting tube; the heat exchange tubes are microchannel heat exchange tubes, a plurality of microchannel heat exchange tubes are arranged between the collecting tube and the collecting tube at intervals in parallel, and the diameter of each microchannel heat exchange tube is 0.1-4 mm. The solar heat collection device can improve the utilization and conversion efficiency of solar heat.

Description

Solar heat collection device and power generation system with same

Technical Field

The application relates to a solar heat collecting device and a power generation system with the same.

Background

Solar energy is an ideal energy source because of its huge energy, clean use, inexhaustible energy. Solar energy has a wide range of roles in everyday life, one of which is the conversion of solar energy into electrical energy. For example, solar cells operate using solar energy, and solar thermal power stations use concentrated sunlight to boil water to form steam, which is then used to generate electricity. Solar thermal power generation firstly converts solar energy into heat energy and then converts the heat energy into electric energy, and the solar thermal power generation has two conversion modes: one is to directly convert solar heat energy into electric energy, such as thermoelectric generation of semiconductor or metal materials, thermal electron and thermal ion generation in vacuum devices, alkali metal thermoelectric conversion, magnetohydrodynamic generation and the like; the other is that the solar heat energy drives a generator to generate electricity through a heat engine such as a steam turbine. At present, the conversion rate of solar energy to electric energy is below 10%, and the conversion efficiency is mainly due to the influence of factors such as the heat absorption efficiency of a solar heat collection plate, the conversion efficiency between steam and absorbed heat of a heat engine, the efficiency of the heat engine for converting heat energy to electric energy, and the like. In the solar heat collecting plate in the prior art, the diameter of a heat exchange tube is usually more than 5mm, the flow velocity of the medium in the heat exchange tube is low, the heat exchange efficiency is reduced, the wall thickness is large, and the energy loss is increased. On the other hand, the heat circulation medium in the prior art generally adopts water, and the collected solar energy is unlikely to change water into steam due to low heat exchange efficiency, i.e. the phase change of the circulation medium is not caused, so that it is very difficult to convert heat energy into electric energy by a heat engine.

Therefore, how to design a solar heat collection device with higher heat absorption and heat conversion efficiency is a technical problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

The application aims to design a solar heat collecting device and a power generation system with the same, solar energy absorbed by a heat collecting plate is rapidly transferred through high-efficiency heat exchange of a micro-channel heat exchanger, and heat radiation loss caused by self temperature rise after the solar heat collecting plate absorbs the solar energy is prevented; meanwhile, according to the temperature which can be reached by solar heat absorption, a proper circulating medium is adopted to form higher steam pressure so as to improve the efficiency of converting heat energy into electric energy by the heat engine.

The solar heat collection device comprises a heat absorption layer, a heat exchange tube and a heat insulation layer, wherein the heat absorption layer is positioned above the heat exchange tube, the heat insulation layer is positioned below the heat exchange tube, and the solar heat collection device is also provided with a collecting tube and a collecting tube; the heat exchange tubes are microchannel heat exchange tubes, a plurality of the microchannel heat exchange tubes are arranged between the collecting tube and the collecting tube at intervals in parallel, the diameter of each microchannel heat exchange tube is 0.1-4 mm, preferably 0.1-1 mm, and the microchannel heat exchange tubes can be metal heat exchange tubes.

The heat absorption layer is formed by splicing an upper heat absorption plate and a lower heat absorption plate, and a groove for accommodating the heat exchange tube is formed between the two heat absorption plates; or the heat absorption layer is a heat absorption coating or a heat absorption film on the heat exchange tube. The heat exchange medium in the microchannel heat exchange tube can be pentane or heptane, and a liquid separation grid can be arranged in the microchannel heat exchange tube.

The application also relates to a power generation system, which comprises a solar heat collection device and a heat engine which are connected with each other, wherein the collection pipe of the solar heat collection device is connected to the inlet of the heat engine so as to utilize the heat exchange medium in the collection pipe to push the heat engine to rotate to generate electric energy, and the solar heat collection device is the solar heat collection device.

The solar heat collecting device comprises a solar heat collecting module, a heat collecting pipe and a heat collecting pipe, wherein the heat collecting pipe and the heat collecting pipe of adjacent solar heat collecting devices are connected through connecting pipes to form the solar heat collecting module; the power generation system further comprises a gas-liquid separator connected and arranged at the downstream of the heat engine, the gas-liquid separator is used for performing gas-liquid separation on a heat exchange medium passing through the heat engine, and the gas-liquid separator is connected with a collecting pipe of the solar heat collection device.

According to the solar heat collecting device and the power generation system with the same, the following technical effects are achieved:

(1) According to the solar heat exchange tube, the upper side and the lower side of the heat exchange tube are respectively provided with the heat absorbing layer and the heat insulating layer, and the plurality of microchannel heat exchange tubes are arranged between the collecting tube and the collecting tube at intervals in parallel, so that the heat storage efficiency of the heat exchange tube is increased, the absorption efficiency of solar energy is improved, and the heat loss is reduced;

(2) Because the pipe diameter of the microchannel heat exchange pipe is smaller, a circulating medium can form a larger flow velocity in the microchannel to generate a microchannel heat exchange effect, and the heat accumulated by the heat exchange pipe can be quickly taken away, so that the heat exchange efficiency is improved; meanwhile, the micro-channel heat exchange tube with small diameter has great bearing capacity, when the temperature of the circulating medium rises and phase change is generated to generate steam with certain pressure, the heat exchange tube is not exploded, the thickness of the heat exchange tube can be reduced, the processing cost of the heat exchange tube is reduced, and the energy loss is reduced;

(3) The circulating heat exchange medium can adopt organic matters with small boiling points, such as pentane, heptane and the like, the heat collecting device absorbs solar energy and enables the circulating medium to be converted into steam, and the heat engine is further pushed to generate electric energy, so that the utilization efficiency of heat is improved.

Drawings

Fig. 1 is a cross-sectional view of a solar thermal collector according to the present application.

Fig. 2 is a plan view of the heat exchange tubes of the solar thermal collector of the present application.

Fig. 3 is a plan layout view of the solar heat collection devices assembled into modules according to the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The solar heat collection device comprises a heat absorption layer 11, a heat exchange tube 12 and a heat insulation layer 13, wherein the heat absorption layer 11 is located above the heat exchange tube 12, and the heat insulation layer 13 is located below the heat exchange tube 12. Preferably, the heat absorbing layer 11 can be formed by splicing an upper heat absorbing plate and a lower heat absorbing plate as shown in fig. 1, and grooves for accommodating the heat exchange tubes 12 are formed at opposite positions of the two heat absorbing plates. After splicing, the heat exchange tube 12 is clamped between the two heat absorbing plates. The surface of the heat absorbing layer can be further pasted with a heat absorbing coating or sprayed with a heat absorbing coating, or the heat absorbing layer is a heat absorbing film or a heat absorbing coating which is positioned on the surface of the heat absorbing pipe and is used for absorbing solar heat energy and transmitting the solar heat energy to the heat exchanging pipe 12. The insulation layer 13 is a thermal insulation material for preventing the heat exchange tubes 12 from dissipating the accumulated heat to the surrounding environment, such as a bottom support structure.

As shown in fig. 2, the heat exchange tubes 12 are provided with header pipes 15 and header pipes 16 at both ends thereof, and a plurality of heat exchange tubes 12 are arranged between the header pipes 15 and the header pipes 16 at intervals in parallel. The heat exchange tube 12 of the present application is a microchannel heat exchange tube with a diameter of 0.1mm to 4mm, preferably a microchannel heat exchange tube with a diameter of 0.1mm to 1mm. The heat exchange tubes 12 are preferably metal heat exchange tubes. The heat exchange tubes 12 are connected to a header 15 and header 16 to form a closed piping system, which is disposed on a bottom support structure. The application discloses circulation heat transfer medium can adopt the less organic matter of boiling point, preferably is less than 80 degrees centigrade pentane, heptane etc. of boiling point to can realize heat transfer medium's phase transition, make it possible to generate electricity to promote the heat engine rotation through steam.

Liquid separation grids 14 can be arranged in the collecting pipe 15 and/or the collecting pipe 16, and the heat exchange pipes 12 can be grouped according to needs by the liquid separation grids 14, so that a circulating medium forms a flow channel with a proper length, and a proper heat exchange area is obtained. Because the pipe diameter of the microchannel heat exchange pipe is smaller, even if the flow of the circulating medium is very small, a larger flow velocity can be formed in the microchannel, and a microchannel heat exchange effect is generated, so that the heat absorbed by the heat exchange pipe 12 is quickly taken away, and the heat exchange efficiency is improved. Meanwhile, because the pipe diameter of the microchannel is very small, the microchannel has very large pressure bearing capacity, and when the temperature of the circulating medium rises to generate phase change steam, the heat exchange pipe 12 cannot be exploded. The micro-channel heat exchange tube has small tube diameter and high bearing capacity, so that the thickness of the heat exchange tube can be reduced, and the processing cost of the heat exchange tube is reduced.

The present application also relates to an electric power generation system having a solar thermal collection device as described above. As shown in fig. 3, the inlet manifold 15 and the outlet manifold 16 of adjacent heat collectors are further connected by a connecting pipe 17 to form a large-area solar heat collecting module. The power generation system further comprises a heat engine and a gas-liquid separator, the collecting pipe of the solar heat collection device is connected to an inlet of the heat engine, the gas heat exchange medium in the collecting pipe pushes the heat engine to rotate to generate electric energy, and the gas-liquid separator is connected and arranged at the downstream of the heat engine. Specifically, the heat collection device absorbs solar energy and converts the circulating medium into steam, and the steam further pushes the heat engine to generate electric energy. The steam-liquid separation is carried out on the circulating medium steam after losing heat energy through the gas-liquid separator, the separated circulating medium steam enters the heat collecting device to be heated, and the separated circulating medium liquid enters the heat collecting device to be subjected to heat exchange to form steam, so that the heat engine is continuously pushed to generate electric energy in a circulating mode.

Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims

1. A solar heat collection device is characterized by comprising a heat absorption layer, a heat exchange tube and a heat insulation layer, wherein the heat absorption layer is positioned above the heat exchange tube, the heat insulation layer is positioned below the heat exchange tube, and the solar heat collection device is also provided with a collecting tube and a collecting tube; the heat exchange tubes are microchannel heat exchange tubes, a plurality of the microchannel heat exchange tubes are arranged between the collecting tube and the collecting tube at intervals in parallel, and the diameter of each microchannel heat exchange tube is 0.1-4 mm.

2. The solar heat collection device according to claim 1, wherein the diameter of the microchannel heat exchange tube is 0.1mm to 1mm.

3. The solar thermal collection device according to claim 1, wherein the microchannel heat exchange tubes are metallic heat exchange tubes.

4. A solar collector according to any one of claims 1 to 3, wherein the heat absorbing layer is formed by splicing an upper heat absorbing plate and a lower heat absorbing plate, and a groove for accommodating the heat exchange tube is arranged between the two heat absorbing plates.

5. Solar collector according to any of claims 1-3, wherein the heat absorbing layer is a heat absorbing coating or film on the heat exchange tubes.

6. The solar collector apparatus of any one of claims 1-3 wherein the heat exchange medium in the microchannel heat exchange tubes is pentane or heptane.

7. The solar collector device as claimed in any one of claims 1 to 3, wherein the microchannel heat exchange tubes are provided with liquid separation compartments therein.

8. An electric power generation system, comprising a solar heat collection device and a heat engine which are connected with each other, wherein the collecting pipe of the solar heat collection device is connected to an inlet of the heat engine so as to utilize a heat exchange medium in the collecting pipe to drive the heat engine to rotate to generate electric energy, and the solar heat collection device is the solar heat collection device according to any one of claims 1 to 7.

9. The power generation system of claim 8, wherein the inlet and outlet pipes of adjacent solar thermal collection devices are connected by connecting pipes to form a solar thermal collection module.

10. The power generation system of claim 9, further comprising a gas-liquid separator disposed downstream of the heat engine for gas-liquid separation of a heat exchange medium passing through the heat engine, the gas-liquid separator being connected to the collector of the solar thermal collector.