An integrated tower power generation system with heat pipe secondary reflection and focusing

Abstract

The invention discloses an integrated tower power generation system of heat pipe type secondary reflection and focusing, wherein an annular heat pipe absorber is suspended above a cylindrical water tank through a bearing tower, a parabolic reflector is mounted on the top of the annular heat pipe absorber, a steam generator is connected above the parabolic reflector through an evaporation riser, the annular heat pipe absorber is connected to the heat exchange inlet of the steam generator through the evaporation riser, the heat exchange outlet of the steam generator is connected to the annular heat pipe absorber through a condensation reflux pipe, the top of the steam generator is connected to a superheat heat exchanger through a steam pipeline, the heat exchange inlet of the superheat heat exchanger is connected to the upper part of the inner cavity of the cylindrical water tank through an evaporation section heat pipe, the heat exchange outlet of the superheat heat exchanger is connected to the bottom of the inner cavity of the cylindrical water tank through a reflux section heat pipe, and the superheat heat exchanger is connected to the steam turbine of the generator through an outlet channel. The power generation system of the invention has the characteristics of high solar energy utilization, strong operability and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of solar thermal power generation, in particular to a heat pipe type secondary reflection and focusing integrated tower power generation system. Background Art

[0002] At present, solar power generation technology is a technology that uses solar energy renewable resources to serve mankind; and high-temperature technology in solar energy is the focus of my country's solar thermal utilization technology development, and medium-temperature thermal utilization technology can be used for regional building heating, air conditioning and refrigeration, seawater desalination and some industrial heat, etc. In the high-temperature field, it is mainly solar thermal power generation technology.

[0003] As far as the current research status is concerned, Chinese invention patent application 201210316364.1 discloses a tower solar power generation system, which improves the operability of the overall control of solar power generation; Chinese invention patent application 201310419565.9 discloses a tower solar power generation system with integrated heat storage and heat exchange; Chinese invention patent application 201510133429.2 discloses a tower solar power station using liquid nitrogen to assist energy storage.

[0004] However, although the above three patents all involve tower solar power generation, they all have low solar energy utilization rates and complex structures.

[0005] In response to this, Chinese invention patent application 201610326403.4 discloses a thermal parameter monitoring device for a tower solar power generation system, which can realize remote monitoring, improve the working conditions of tower power generation, and improve the operability of the tower solar power generation system as a whole.

[0006] However, in practical applications, power generation systems generally have characteristics such as instability, complex structure, and low utilization rate, so the utilization efficiency of solar energy still needs to be greatly improved. Summary of the invention

[0007] The main purpose of the present invention is to provide an integrated tower power generation system with heat pipe secondary reflection and concentration, which has the characteristics of high solar energy utilization rate, strong operability and low cost.

[0008] The present invention can be implemented by the following technical solutions:

[0009] The present invention discloses an integrated tower power generation system of heat pipe type secondary reflection and focusing, comprising a secondary solar energy absorber, a superheat heat exchanger and an annular heat pipe absorber, wherein the secondary solar energy absorber comprises a cylindrical water tank, the annular heat pipe absorber is suspended above the cylindrical water tank through a bearing tower, a parabolic reflector is mounted on the top of the annular heat pipe absorber, a steam generator is connected above the parabolic reflector through an evaporation riser, the annular heat pipe absorber is connected to the heat exchange inlet of the steam generator through the evaporation riser, the heat exchange outlet of the steam generator is connected to the annular heat pipe absorber through a condensation reflux pipe, the top of the steam generator is connected to the superheat heat exchanger through a steam pipeline, the heat exchange inlet of the superheat heat exchanger is connected to the upper part of the inner cavity of the cylindrical water tank through an evaporation section heat pipe, the heat exchange outlet of the superheat heat exchanger is connected to the bottom of the inner cavity of the cylindrical water tank through a reflux section heat pipe, and the superheat heat exchanger is connected to the steam turbine of the generator through an outlet channel.

[0010] In terms of system composition, the secondary solar energy absorber in the present invention can reabsorb sunlight, thereby improving the utilization efficiency of solar energy; in terms of energy utilization rate, the parabolic reflector of the present invention can reabsorb the sunlight reflected from the parabolic reflector onto the radiation collection heat pipe of the secondary solar energy absorber, thereby improving the utilization efficiency of solar energy; in terms of structural design, the present invention places the annular heat pipe absorber in the middle of the tower, thereby reducing the height of the tower and saving costs; in terms of operability, the circulation of water vapor in the entire system of the present invention utilizes itself and gravity for circulation, thereby saving material and production costs, making the structure of the entire system compact, more operable and reducing maintenance costs.

[0011] Furthermore, the annular heat pipe absorber includes an upper annular tube and a lower annular tube, and a plurality of parallel heat absorbing tubes are evenly distributed along the circumferential direction between the upper annular tube and the lower annular tube, and the two ends of the heat absorbing tube are respectively connected to the upper annular tube and the lower annular tube, the bottom end of the condensation reflux tube is connected to the upper annular tube, and the bottom end of the evaporation riser is connected to the lower annular tube.

[0012] Furthermore, a curved secondary reflector is provided inside the annular heat pipe absorber, and the curved secondary reflector is located on the inner side of the heat absorbing pipe. A curved secondary reflector is provided inside the annular heat pipe absorber, and the curved secondary reflector can reflect sunlight that is not irradiated to the outer side of the annular heat pipe absorber to the inner side of the heat absorbing pipe of the annular heat pipe absorber, thereby performing secondary absorption of sunlight and improving the utilization efficiency of solar energy.

[0013] Furthermore, a liquid level sensor is provided inside the steam generator, a water supply nozzle is provided on the side wall of the steam generator, a water supply solenoid valve is connected to the water supply nozzle, and the liquid level sensor and the water supply solenoid valve are respectively connected to a water supply controller. When there is no water inside the steam generator, water can be automatically added to the steam generator through the cooperation of the water supply solenoid valve, the liquid level sensor and the water supply controller.

[0014] Furthermore, a plurality of radiation collecting heat pipes are provided at the bottom of the inner cavity of the cylindrical water tank, and the radiation collecting heat pipes are evenly distributed in a ring shape inside the cylindrical water tank to ensure a better absorption effect of sunlight.

[0015] Furthermore, an S-shaped heat exchange tube is arranged inside the steam generator, and both ends of the S-shaped heat exchange tube are respectively connected to the heat exchange inlet and the heat exchange outlet of the steam generator. The arranged S-shaped heat exchange tube helps to increase the contact area of ​​heat exchange, so that more water can evaporate into water vapor, thereby improving the power generation efficiency.

[0016] Furthermore, the bearing tower comprises a plurality of bearing rods, which are fixed between the annular heat pipe absorber and the cylindrical water tank and are evenly distributed along the circumferential direction, so that the structural support is more stable and reliable.

[0017] Further, the steam generator is arranged at the focus of the parabola of the parabola reflecting mirror.

[0018] The heat pipe type secondary reflection and focusing integrated tower power generation system of the present invention has the following beneficial technical effects:

[0019] First, the solar energy utilization rate is high. From the perspective of system structure, the secondary solar energy absorber in the present invention can reabsorb sunlight, thereby improving the utilization efficiency of solar energy; from the perspective of energy utilization, the parabolic reflector surface of the present invention can reabsorb the sunlight reflected from the parabolic reflector surface to the radiation collection heat pipe of the secondary solar energy absorber, thereby improving the utilization efficiency of solar energy;

[0020] Second, the operability is strong. The circulation of water vapor in the whole system of the present invention is carried out by utilizing the water vapor itself and gravity, which saves material and production costs while making the structure of the whole system compact and more operable.

[0021] Third, the cost is low. From the perspective of structural design, the present invention places the annular heat pipe absorber in the middle of the tower, which reduces the height of the tower and saves costs. From the perspective of operability, the circulation of water vapor in the entire system of the present invention utilizes itself and gravity to circulate, saving material and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1It is a three-dimensional schematic diagram of the overall structure of an integrated tower power generation system with heat pipe secondary reflection and focusing;

[0023] Attached Figure 2 It is a schematic front view of the overall structure of an integrated tower power generation system with heat pipe type secondary reflection and focusing;

[0024] Attached Figure 3 It is a schematic diagram of the internal structure of a steam generator in a heat pipe type secondary reflection and focusing integrated tower power generation system;

[0025] Attached Figure 4 It is a schematic diagram of the internal structure of an annular heat pipe absorber in an integrated tower power generation system with heat pipe secondary reflection and focusing;

[0026] Attached Figure 5 It is a schematic diagram of the internal structure of a secondary solar energy absorber and a superheat heat exchanger in a heat pipe type secondary reflection and concentrating integrated tower power generation system;

[0027] Attached Figure 6 The schematic diagram is a structural diagram of a heat pipe type secondary reflection and focusing integrated tower power generation system connected with a steam turbine and a generator.

[0028] The reference numerals include: 1-steam pipe, 2-water supply pipe port, 3-steam generator, 4-condensation reflux pipe, 5-evaporation riser, 6-parabolic reflector, 7-annular heat pipe absorber, 71-lower annular pipe, 72-upper annular pipe, 73-absorption pipe, 8-curved secondary reflector, 9-carrying tower, 10-secondary solar absorber, 11-evaporation section heat pipe, 12-reflux section heat pipe, 13-exit channel, 14-superheat heat exchanger, 15-radiation collection heat pipe, 16-cylindrical water tank, 17-heliostat, 18-steam turbine, 19-generator. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following is a further detailed description of the product of the present invention in conjunction with embodiments.

[0030] like Figures 1 to 6As shown, the present invention discloses an integrated tower power generation system of heat pipe type secondary reflection and concentration, comprising a secondary solar energy absorber 10, a superheat heat exchanger 14 and an annular heat pipe absorber 7, wherein the secondary solar energy absorber 10 comprises a cylindrical water tank 16, characterized in that: the annular heat pipe absorber 7 is suspended above the cylindrical water tank 16 through a bearing tower 9, a parabolic reflector 6 is mounted on the top of the annular heat pipe absorber 7, a steam generator 3 is connected above the parabolic reflector 6 through an evaporation riser 5, and the annular heat pipe absorber 7 is connected to the steam generator 3 through an evaporation riser 5. The riser 5 is connected to the heat exchange inlet of the steam generator 3, the heat exchange outlet of the steam generator 3 is connected to the annular heat pipe absorber 7 through the condensation reflux pipe 4, the top of the steam generator 3 is connected to the superheat heat exchanger 14 through the steam pipe 1, the heat exchange inlet of the superheat heat exchanger 14 is connected to the upper part of the inner cavity of the cylindrical water tank 16 through the evaporation section heat pipe 11, the heat exchange outlet of the superheat heat exchanger 14 is connected to the bottom of the inner cavity of the cylindrical water tank 16 through the reflux section heat pipe 12, and the superheat heat exchanger 14 is connected to the steam turbine 18 of the generator 19 through the outlet channel 13.

[0031] like Figures 3-4 As shown, as an embodiment of the present invention, the annular heat pipe absorber 7 includes an upper annular tube 72 and a lower annular tube 71, and a plurality of parallel heat absorption tubes 73 are evenly distributed along the circumferential direction between the upper annular tube 72 and the lower annular tube 71, and the two ends of the heat absorption tube 73 are respectively connected to the upper annular tube 72 and the lower annular tube 71, the bottom end of the condensation reflux tube 4 is connected to the upper annular tube 72, and the bottom end of the evaporation riser 5 is connected to the lower annular tube 71.

[0032] like Figure 1 , 2 As shown in FIG. 4 , as an embodiment of the present invention, a curved secondary reflection mirror 8 is further provided inside the annular heat pipe absorber 7 , and the curved secondary reflection mirror 8 is located on the inner side of the heat absorption pipe 73 .

[0033] As an embodiment of the present invention, a liquid level sensor is arranged inside the steam generator 3, a water replenishment pipe port 2 is arranged on the side wall of the steam generator 3, a water replenishment solenoid valve is connected to the water replenishment pipe port 2, and the liquid level sensor and the water replenishment solenoid valve are respectively connected to the water replenishment controller.

[0034] As an embodiment of the present invention, a plurality of radiation collecting heat pipes 15 are provided at the bottom of the inner cavity of the cylindrical water tank 16 , and the radiation collecting heat pipes 15 are evenly distributed in a ring shape inside the cylindrical water tank 16 .

[0035] As an embodiment of the present invention, an S-shaped heat exchange tube is provided inside the steam generator 3 , and both ends of the S-shaped heat exchange tube are respectively connected to the heat exchange inlet and the heat exchange outlet of the steam generator 3 .

[0036] As an embodiment of the present invention, the bearing tower 9 includes a plurality of bearing rods, which are fixed between the annular heat pipe absorber 7 and the cylindrical water tank 16 and are evenly distributed along the circumferential direction.

[0037] As an embodiment of the present invention, the steam generator 3 is arranged at the focus of the parabola of the parabola reflecting mirror 6 .

[0038] The working principle of the present invention is:

[0039] Concentrating process: The solar concentrating field composed of heliostats 17 automatically tracks the sun and reflects the sunlight onto the outer surfaces of the upper annular tube 72, the lower annular tube 71 and the heat absorbing tube 73 of the annular heat pipe absorber 7; at the same time, the curved secondary reflecting mirror 8 will reflect the solar radiation not absorbed by the outer surface of the annular heat pipe absorber 7 from the inside to the inner surfaces of the upper annular tube 72, the lower annular tube 71 and the heat absorbing tube 73 of the annular heat pipe absorber 7, thereby improving the utilization efficiency of solar energy; the upper annular tube 72, the lower annular tube 71 and the heat absorbing tube 73 will absorb sunlight and heat the water medium inside.

[0040] In addition, a parabolic reflector 6 is mounted on the top of the annular heat pipe absorber 7, and the parabolic reflector 6 can reflect the sunlight emitted by the heliostat 17 to the parabolic reflector 6 to the radiation collection heat pipe 15 of the secondary solar absorber 10 for reabsorption, thereby improving the utilization efficiency of solar energy. If there is no parabolic reflector 6, part of the solar energy emitted by the heliostat 17 cannot be fully absorbed.

[0041] Steam production process: The solar radiation absorbed by the annular heat pipe absorber 7 is used to directly heat the working fluid in the upper annular tube 72, the lower annular tube 71 and the heat absorption tube 73. The evaporation riser 5 will transmit the generated steam to the S-shaped heat exchange tube in the steam generator 3. The steam in the S-shaped heat exchange tube exchanges heat with the water in the steam generator 3, thereby generating high-temperature and high-pressure steam; the steam is transmitted from the steam pipe 1 at the top of the steam generator 3 to the superheater 14; and the working fluid condensed after heating the water will circulate back to the annular heat pipe absorber 7 through the condensation reflux tube 4 under the action of gravity.

[0042] The secondary solar receiver 10 receives the heat of solar radiation, and heats the water in the cylindrical cavity of the cylindrical water tank 16 through the radiation collection heat pipe 15 of the secondary solar absorber 10, so that it produces high-temperature and high-pressure steam. The generated steam is transmitted to the superheat heat exchanger 14 through the evaporation section heat pipe 11, and exchanges heat with the steam in the steam pipe 1. After heat exchange in the superheat heat exchanger 14, the steam transmitted by the evaporation section heat pipe 11 will form low-temperature liquid water; the liquid water flows back to the cylindrical cavity of the cylindrical water tank 16 through the return section heat pipe 12, completing a steam cycle. Finally, the steam that has undergone secondary heat exchange flows from the outlet pipe 13 to the driving end of the steam turbine 18. Such a configuration can make up for the heat loss of the steam during the transmission process of the steam pipe 1.

[0043] Power generation process: The high-temperature and high-pressure steam flowing out of the outlet pipe 13 flows into the steam power device, thereby providing power for the steam turbine 18 to output useful work. The useful work output by the steam turbine 18 drives the generator 19 in the power generation device to generate electricity, thereby completing a power generation process.

[0044] In summary, the heat pipe type secondary reflection and concentration integrated tower solar power generation system of the present invention has a compact and simple structure, saves raw materials, is easy to produce and operate, and has a high solar energy utilization rate. It can better solve the shortcomings of the tower solar power generation system involved in the known technology, such as complex structure, high production cost, complex operation, and low solar energy utilization rate.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the specification and described above. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are all equivalent embodiments of the present invention. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A heat pipe type secondary reflection and concentrating integrated tower power generation system, comprising a secondary solar energy absorber (10), a superheat heat exchanger (14) and a ring heat pipe absorber (7), wherein the secondary solar energy absorber (10) comprises a cylindrical water tank (16), characterized in that: The annular heat pipe absorber (7) is suspended above the cylindrical water tank (16) via a supporting tower (9); a parabolic reflector (6) is mounted on the top of the annular heat pipe absorber (7); a steam generator (3) is connected to the parabolic reflector (6) via an evaporation riser (5); the annular heat pipe absorber (7) is connected to the heat exchange inlet of the steam generator (3) via the evaporation riser (5); and the heat exchange outlet of the steam generator (3) is connected to the annular heat pipe absorber (7) via a condensation reflux pipe (4). The steam generator (3) is connected to a steam absorber (7), the top of the steam generator (3) is connected to a superheat heat exchanger (14) through a steam pipe (1), the heat exchange inlet of the superheat heat exchanger (14) is connected to the upper part of the inner cavity of the cylindrical water tank (16) through an evaporation section heat pipe (11), the heat exchange outlet of the superheat heat exchanger (14) is connected to the bottom of the inner cavity of the cylindrical water tank (16) through a return section heat pipe (12), and the superheat heat exchanger (14) is connected to a steam turbine (18) of a generator (19) through an outlet channel (13); A liquid level sensor is arranged inside the steam generator (3); a water supply pipe opening (2) is arranged on the side wall of the steam generator (3); a water supply solenoid valve is connected to the water supply pipe opening (2); and the liquid level sensor and the water supply solenoid valve are respectively connected to a water supply controller; The annular heat pipe absorber (7) comprises an upper annular tube (72) and a lower annular tube (71); a plurality of heat absorbing tubes (73) are evenly distributed along the circumferential direction between the upper annular tube (72) and the lower annular tube (71); two ends of the heat absorbing tube (73) are respectively connected to the upper annular tube (72) and the lower annular tube (71); the bottom end of the condensation reflux tube (4) is connected to the upper annular tube (72); and the bottom end of the evaporation riser (5) is connected to the lower annular tube (71); A curved secondary reflection mirror (8) is also provided inside the annular heat pipe absorber (7), and the curved secondary reflection mirror (8) is located on the inner side of the heat absorption pipe (73); The steam generator (3) is arranged at the focus of the parabola of the parabola reflecting mirror (6).

2. The heat pipe type secondary reflection and focusing integrated tower power generation system according to claim 1 is characterized in that: A plurality of radiation collecting heat pipes (15) are provided at the bottom of the inner cavity of the cylindrical water tank (16); the radiation collecting heat pipes (15) are evenly distributed in a ring shape inside the cylindrical water tank (16).

3. The heat pipe secondary reflection and focusing integrated tower power generation system according to claim 2 is characterized by: An S-shaped heat exchange tube is arranged inside the steam generator (3), and two ends of the S-shaped heat exchange tube are respectively connected to a heat exchange inlet and a heat exchange outlet of the steam generator (3).

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