CN201615466U - A single-layer glass tube coaxial sleeve type trough solar collector tube module - Google Patents

Abstract

The utility model discloses a single-layer glass tube coaxial casing type trough type solar heat collecting tube module. One end of the casing inner tube is connected to the condensate water main pipe through the condensate water inlet pipe. Flanges are provided at both ends of the condensate water main pipe. In communication, the connecting end of the casing outer tube and the casing inner tube is connected to one end of the steam outlet pipe, and the other end of the steam outlet pipe is connected to the steam main pipe. Flanges are provided at both ends of the steam main pipe, and the U-shaped glass tube is set on the The outside of the casing outer tube is sealed and connected with the casing outer tube through a special alloy sealing cover. The two ends of the U-shaped glass tube are fixed on the casing outer tube through two heat-insulating supports. The utility model efficiently transfers the absorbed heat energy to the equipment that needs to utilize the heat energy. The whole heat collecting tube has high efficiency, simple structure, modular design, convenient installation, high positioning accuracy, low production cost, and can be used in a large area. The ubiquity of utilization offers possibilities.

Description

A single-layer glass tube coaxial sleeve type trough solar collector tube module

technical field

The utility model relates to a trough type solar heat collecting tube, in particular to a single-layer glass tube coaxial casing type trough type solar heat collecting tube module.

Background technique

Most of the medium and high temperature steam produced by solar energy in foreign countries use straight-through heat collecting tubes. The working process of the heat collecting tubes is that the liquid flows from one end of the heat collecting tubes to the other end, and the heat collecting tubes absorb sunlight to heat the working medium, and finally generate steam at the outlet. However, the system has the following problems: (1) The welding process of glass and steel is still immature, and the straight-through pipe used for power generation has high requirements for sealing under high temperature conditions, the process is complicated, and the yield is low, resulting in high prices; (2) In order to solve The problem of different expansion coefficients of steel and glass requires bellows to be added at both ends. The structure is complex, and it is easy to generate torque under the condition of uneven force, resulting in greater stress on the seals at both ends. Traditional U-shaped tubes are also used at present, but there are also a lot of problems: (1) Since the inner diameter of the vacuum glass tube is fixed, the outer diameter of each metal tube of the traditional U-shaped tube cannot exceed half of the vacuum tube. The diameter is small, and the flow resistance is large; (2) due to the small diameter and long extension distance, it is easy to cause insufficient rigidity, and the end of the vacuum glass tube rests on the vacuum glass tube to cause the vacuum glass tube to break; (3) the nozzle is not easy to seal. The traditional U-shaped heat collector with coaxial sleeve also has many problems such as installation difficulties, poor installation accuracy of the heat collector position, and insufficient efficiency during field use.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the prior art, and provide a single-layer glass tube coaxial sleeve type trough solar collector with high reliability, simple structure, low cost, convenient installation and high precision, and is convenient for large-scale promotion. Heat pipe module.

The single-layer glass tube coaxial sleeve type trough solar collector tube module includes the first flange, steam main pipe, steam outlet pipe, second flange, third flange, ring seal, casing outer pipe, vacuum exhaust port , alloy sealing cover, first heat insulation support, U-shaped glass tube, sleeve inner tube, metal support, second heat insulation support, plugging, fourth flange, condensate main pipe, condensate inlet pipe, sleeve One end of the inner tube is connected to the condensed water main pipe through the condensed water inlet pipe, one end of the condensed water main pipe is connected to the third flange, and the other end is connected to the fourth flange, and the outer tube of the casing is sleeved outside the inner tube of the casing. The other end of the inner tube of the casing communicates with the outer tube of the casing. One end of the outer tube of the casing is connected to the inner tube of the casing through a ring seal, and the other end is sealed with a plug. The connection end of the outer tube of the casing and the inner pipe of the casing It is connected with one end of the steam outlet pipe, the other end of the steam outlet pipe is connected with the steam main pipe, one end of the steam main pipe is connected with the first flange, and the other end is connected with the second flange, and the U-shaped glass tube is set in the sleeve The outside of the outer tube is sealed and connected with the outer tube of the casing through the alloy sealing cover. The two ends of the U-shaped glass tube are fixed on the outer tube of the casing through the first heat insulation support and the second heat insulation support. There is a vacuum port on the top for vacuuming.

The inner tube of the casing and the outer tube of the casing are coaxially arranged, and a metal support is provided between the end of the outer tube of the casing and the inner tube of the casing, and the outer tube of the casing is arranged coaxially with the U-shaped glass tube. A supporting piece is arranged between the outer tube of the tube and the U-shaped glass tube.

The utility model adopts the coaxial sleeve tube as the main body of the heat collecting tube, and coats the outer wall of the outer tube with a solar light absorbing coating, so that the maximum allowable focused light band is the cross section at the diameter of the outer tube, avoiding the strict control of the focused light band The cost of the focusing system is greatly increased, which reduces the cost of the entire system. The cross-sectional area of the two inner and outer channels of the coaxial sleeve structure is twice as large as that of the traditional U-shaped tube. At the same time, the uniformity of the flow field is improved, the flow resistance is greatly reduced, and the heat transfer efficiency is improved. The band of sunlight focused by the parabolic mirror falls completely on the collector tube. In addition, a single-layer glass tube is used outside the outer tube of the casing and evacuated, which reduces the number of glass layers in the traditional coaxial casing plus vacuum glass tube structure, which not only reduces the weight but also increases the transmittance of sunlight. Evacuation also reduces convection losses. At the same time, this kind of retains the advantages of the traditional coaxial casing structure, using two standard size steel pipes, the raw materials are relatively easy to purchase, the processing is convenient, and the cost is relatively low. The utility model adopts the idea of modularization in the design, and integrates the steam main pipe and the condensed water main pipe together to design a heat collecting pipe module, which is convenient for on-site installation, and at the same time enables the on-site installation to accurately make the concentrating belt fall. On the heat collecting tube, the installation engineering quantity and installation cost are greatly reduced, which provides the possibility for the large-scale utilization of high-temperature heat in solar energy.

Description of drawings

Fig. 1 is the schematic diagram of the front view of the single-layer glass tube coaxial casing type trough type solar collector tube module structure of the present invention;

Fig. 2 is the top view of the structure module of single-layer glass tube coaxial casing type trough type solar collector tube of the utility model;

Fig. 3 is the left view of the utility model single-layer glass tube coaxial casing type trough type solar collector tube structure module;

Fig. 4 is a view of the metal support member of the utility model single-layer glass tube coaxial sleeve type trough type solar collector tube module.

In the figure: the first flange 1, the main steam pipe 2, the steam outlet pipe 3, the second flange 4, the third flange 5, the annular plug 6, the casing outer pipe 7, the vacuum pumping port 8, the alloy sealing cover 9 , the first heat insulation support 10, U-shaped glass tube 11, casing inner tube 12, metal support 13, second heat insulation support 14, plugging 15, fourth flange 16, condensate water main pipe 17, condensate water Inlet pipe 18.

Detailed ways

As shown in Figures 1, 2, 3, and 4, the single-layer glass tube coaxial casing type trough solar collector tube module includes a first flange 1, a steam main pipe 2, a steam outlet pipe 3, a second flange 4, and a second flange 4. Three flanges 5, annular plugging 6, sleeve outer tube 7, vacuum pumping port 8, alloy sealing cover 9, first heat insulating support 10, U-shaped glass tube 11, sleeve inner tube 12, metal support 13, The second heat insulation support 14, the plugging 15, the fourth flange 16 are connected, the condensed water main pipe 17, the condensed water inlet pipe 18, and one end of the casing inner pipe 12 is connected with the condensed water main pipe 17 through the condensed water inlet pipe 18 , one end of the condensed water main pipe 17 is connected with the third flange 5, the other end is connected with the fourth flange 16, the casing outer pipe 7 is set outside the casing inner pipe 12, and the other end of the casing inner pipe 12 is connected with the casing The outer tube 7 communicates, and one end of the casing outer tube 7 is connected 6 with the casing inner tube 12 through an annular plug 6, and the other end is sealed with a plug 15, and the connecting end of the casing outer tube 7 and the casing inner tube 12 is connected to the One end of the steam outlet pipe 3 is connected, the other end of the steam outlet pipe 3 is connected with the steam main pipe 2, one end of the steam main pipe 2 is connected with the first flange 1, and the other end is connected with the second flange 4, U-shaped The glass tube 11 is set outside the casing outer tube 7, and is sealed and connected with the casing outer tube 7 through an alloy sealing cover 9, and the two ends of the U-shaped glass tube 11 pass through the first heat-insulating support 10 and the second heat-insulating support 14 is fixed on the casing outer tube 7, and the alloy sealing cover 9 is provided with a vacuum port 8 for vacuuming.

The sleeve inner tube 12 and the sleeve outer tube 7 are coaxially arranged, and a metal support 13 is provided between the end of the sleeve outer tube 7 and the sleeve inner tube 12, and the sleeve outer tube 7 and the U-shaped glass tube 9 The position is coaxially arranged.

The utility model uses the structure of the coaxial sleeve to improve the flow field distribution of the fluid in the solar heat collection tube, improve the heat collection efficiency of the solar heat collection tube and reduce the cost of the solar heat collection system, and at the same time, part of the steam pipe and the condensed water pipe are connected with the The heat collecting tube is designed as a whole, which facilitates the installation and improves the installation accuracy. The outside of the heat collecting tube adopts a single-layer U-shaped glass tube, and the alloy and glass tube are welded together at the nozzle position and sealed and evacuated. Compared with the traditional casing U-shaped heat collecting tube, the weight is reduced, and the number of glass tubes and heat collecting tubes is increased. The vacuum degree between them reduces the number of glass layers and improves the light-to-heat conversion efficiency. At the same time, the heat-insulating support is used to support and separate the heat-collecting tube and the glass tube, which has increased the reliability of the heat-collecting tube. The inner tube of the coaxial sleeve is generally used as the inlet tube for low-temperature fluid, and the outer tube of the sleeve is generally used as the outlet tube for high-temperature fluid. In addition, the outer wall of the outer tube of the sleeve is coated with a solar absorbing coating to absorb sunlight to generate heat and transmit it. Heat to the working fluid in the tube. The flow direction of the working medium in the tube when the whole single-layer glass tube coaxial sleeve type trough solar collector tube is working is as follows: the low temperature working medium passes through the flange and flows into the inner tube of the casing through the condensate pipe and the condensate inlet from the externally connected system Then flow through the entire inner tube and flow out from the other end. After passing through the plugging at the end of the outer tube and changing direction, it bypasses the inner tube wall and enters the outer tube of the sleeve. The outer tube wall absorbs the solar radiation energy and converts it into heat. The heat of the tube wall is conducted to the working fluid in the outer tube of the casing, and the working fluid in the heating tube becomes steam, and finally flows out from the steam outlet pipe, the steam main pipe and the flange.

The entire heat collecting tube mainly includes two modules of heat collecting and heat transfer, and the heat collecting module is mainly composed of a single-layer U-shaped glass tube, an alloy sealing cover, and a heat insulating support. The heat transfer module is mainly composed of casing outer pipe, casing inner pipe, steam outlet pipe, steam main pipe, condensed water inlet pipe, condensed water main pipe and flange. The depth of the inner tube of the casing into the outer tube of the casing must have a certain size, so as to leave enough space to allow the working fluid to pass through without affecting the flow.

The use of the single-layer glass tube coaxial sleeve type trough solar collector tube module of the utility model is mainly used in combination with the loop type gravity heat pipe to form a section of the evaporation section of the heat pipe. When in use, the height of the steam main pipe should always be higher than the sleeve pipe , so as not to cause air resistance.

The main heat transfer process inside the single-layer glass tube coaxial sleeve type trough solar collector tube module of the utility model is as follows: solar energy passes through the single-layer U-shaped glass tube, a small part is lost by glass refraction and absorption, and most of it is irradiated The coating on the outer wall of the casing outer tube is converted into heat, part of this heat is lost to the environment through radiation heat exchange, and the other part is transferred to the inner wall of the casing outer tube through heat conduction of the casing outer tube, and then through convection exchange. The heat and radiation heat exchange is transferred to the working fluid. Part of the heat obtained by the working fluid is transferred to the steam through phase transformation. The steam flows through the steam outlet pipe and the steam main pipe under the push of pressure to take away the heat, and the other part It is transferred to the outer wall of the inner tube through convective heat exchange and radiation heat exchange with the outer wall of the inner tube of the casing, then transferred to the inner wall of the inner tube of the casing through heat conduction, and then transferred to the working fluid of the inner tube through convective heat exchange and radiation heat exchange. .

Claims (2)

1. a single-layer glass tube coaxial casing type trough solar collector tube module is characterized in that comprising a first flange (1), a steam main pipe (2), a steam outlet pipe (3), a second flange ( 4), the third flange (5), the annular plug (6), the casing outer tube (7), the exhaust port (8), the alloy sealing cover (9), the first heat insulation support (10), U-shaped glass tube (11), sleeve inner tube (12), metal support (13), second heat insulation support (14), plugging (15), fourth flange (16), condensate water main pipe ( 17), condensed water inlet pipe (18); one end of the casing inner pipe (12) is connected to the condensed water main pipe (17) through the condensed water inlet pipe (18), and one end of the condensed water main pipe (17) is connected to the third flange (5) are connected, the other end of the condensed water main pipe (17) is connected with the fourth flange (16), the casing outer pipe (7) is set outside the casing inner pipe (12), and the casing inner pipe (12) The other end communicates with the casing outer pipe (7), and one end of the casing outer pipe (7) is connected with the casing inner pipe (12) through an annular plug (6), and the other end of the casing outer pipe (7) is sealed with Plug (15) to seal, the connecting end of casing outer pipe (7) and casing inner pipe (12) is connected with one end of steam outlet pipe (3), and the other end of steam outlet pipe (3) is connected with steam main pipe (2 ), one end of the steam main pipe (2) is connected with the first flange (1), the other end of the steam main pipe (2) is connected with the second flange (4), and the U-shaped glass pipe (11) is set on The outside of the casing outer tube (7) is sealed and connected with the casing outer tube (7) through an alloy sealing cover (9). The two ends of the U-shaped glass tube (11) pass through the first heat insulating support (10) and the second Two heat-insulating supports (14) are fixed on the casing outer tube (7), and the alloy sealing cover (9) is provided with a vacuum exhaust port (8). 2. A kind of single-layer glass tube coaxial sleeve type trough solar collector tube module according to claim 1, characterized in that the sleeve inner tube (12) and the sleeve outer tube (7) are coaxial arrangement, a metal support (13) is provided between the end of the sleeve outer tube (7) and the sleeve inner tube (12), and the position of the sleeve outer tube (7) and the U-shaped glass tube (11) are arranged coaxially, A first heat-insulating support (10) and a second heat-insulation support (14) are arranged between the casing outer pipe (7) and the U-shaped glass pipe (11).

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