A solar thermal power generation system

Abstract

The present invention relates to the field of solar power generation technology, specifically a solar thermal power generation system, including: a collector and a concentrator, the concentrator includes a concentrating mirror, a support column and a support seat, a tracker is provided on the support column, one end of the support column is mechanically connected to the concentrating mirror, the tracker drives the concentrator to converge sunlight to the top of the collector, a plurality of heat collecting tubes are provided on the top of the collector, the plurality of heat collecting tubes are connected to the steam condensation zone, a steam condensation zone is provided inside the collector, the other end of the support column is mechanically connected to the support seat, and is fixed to the ground through the support seat. The overall system of the present invention forms a circulation mode, improves energy utilization, has a long working time, directly increases power generation and reduces costs.

Description

Technical Field

[0001] The present invention relates to the technical field of solar power generation, and in particular to a photothermal power generation system. Background Art

[0002] When coal is burned, the exhaust gas contains sulfide, nitrogen oxide, and dust, especially a large amount of carbon dioxide gas will be released into the external environment. Carbon dioxide is considered to be the main reason for the strengthening of the greenhouse effect in the earth's atmosphere. Coal is a non-renewable energy source. When natural gas or oil is used to generate electricity, nitrogen oxides and sulfides will also be emitted. These pollutants will enter the water source and food chain, affecting human health. Natural gas and oil are also non-renewable energy sources. Although hydroelectric power generation does not emit pollutants into the environment, the construction of dams will flood large areas of land, and many residents must be relocated. The reservoir will also affect the ecology of nearby rivers. Using biomass energy to generate electricity will require a large area of ​​land because biomass energy comes from renewable substances such as plants, animals and microorganisms. The combustion of plants will produce dust and carbon dioxide. The heat energy of nuclear power generation comes from nuclear fission, which will inevitably emit very small amounts of radioactive substances into the external environment. If a serious accident occurs in a nuclear power plant, a large amount of radioactive substances will be released into the external environment, causing harm to the environment and the public. Regarding wind power generation, since wind energy is random and the wind force changes all the time, it is difficult to achieve stable power supply. Wind power generation will not cause water pollution, but it may cause harm to birds near the power generation device.

[0003] The sun is the eternal energy source of the earth. It emits about 3.8×1020MW of energy into space every second in the form of light radiation, of which 1 / 2.2 billion is projected onto the earth. The huge solar energy is the source of growth for all things on earth. Making full use of solar energy, creating green industries, and developing a low-carbon economy have the dual great significance of continuous energy supply and environmental protection. The fiery sunlight shines on the earth, and solar energy can be used everywhere.

[0004] The solar thermal collection system uses direct solar radiation as energy. The thermal collection system uses the light-to-heat conversion method to achieve the conversion of light energy into heat energy through focusing, reflection and absorption, so that the heat exchange medium reaches a certain temperature to meet the needs of different loads.

[0005] At present, how to improve the efficiency of solar thermal collection is a direction that urgently needs improvement in solar thermal collection. Summary of the invention

[0006] In order to improve the solar thermal collection efficiency, the present invention provides a solar thermal power generation system, including: a collector and a concentrator;

[0007] The concentrator comprises a concentrating mirror, a supporting column and a supporting seat;

[0008] A tracker is provided on the support column, and one end of the support column is mechanically connected to the focusing mirror surface;

[0009] The tracker drives the concentrator to focus the sunlight onto the top of the collector, which is equipped with multiple heat collecting tubes.

[0010] The plurality of heat collecting tubes are connected to the steam condensation zone, and a steam condensation zone is provided inside the heat collector;

[0011] The other end of the support column is mechanically connected to the support base and is fixed to the ground through the support base.

[0012] Preferably, the focusing mirror surface comprises a plurality of aluminum alloy lenses;

[0013] The aluminum alloy lenses are sprayed with a silver solution.

[0014] Preferably, it also includes a softening water tank;

[0015] A water inlet is provided on one side of the collector;

[0016] The water outlet of the softening water tank is connected with the water inlet.

[0017] Preferably, it also includes a three-way valve, a heat storage device and a steam turbine generator;

[0018] The first air outlet of the collector is connected to the first port of the three-way valve, and the second port of the three-way valve is connected to the first air inlet of the steam turbine generator;

[0019] The third port of the three-way valve is connected to the air inlet of the heat storage device, and the air outlet of the heat storage device is connected to the second air inlet of the steam turbine generator.

[0020] Preferably, a condensate return pipe is provided at the bottom of the steam condensation zone;

[0021] The collector is connected to the softening water tank through the condensate return pipe.

[0022] Preferably, it also includes a softening water treatment device, a raw water tank and a self-provided water source tank;

[0023] The water inlet of the softening water tank is connected to the water outlet of the softening water treatment device;

[0024] The water inlet of the softening water treatment device is connected to the water outlet of the raw water tank;

[0025] The first water inlet of the raw water tank is connected to the self-provided water source tank, and the second water inlet of the raw water tank is connected to the drain outlet of the steam turbine generator.

[0026] Preferably, it also includes a gas storage reflux device;

[0027] The air outlet of the air storage reflux device is connected to the water outlet of the softening water tank;

[0028] The first exhaust port of the steam turbine generator is connected to the air inlet of the air storage reflux device.

[0029] Preferably, the second exhaust port of the steam turbine generator is connected to the second air outlet of the collector.

[0030] Preferably, a gate valve is provided between the water inlet of the softening water treatment device and the water outlet of the raw water tank;

[0031] A liquid level control valve is provided at the drain outlet of the steam turbine generator;

[0032] A pneumatic valve is provided at the second exhaust port of the steam turbine generator;

[0033] Safety valves are installed on the heat storage device, collector, steam turbine generator and gas storage reflux device.

[0034] Preferably, it also includes a controller;

[0035] The support column and the focusing mirror are provided with a driving device, and the driving device is electrically connected to the controller;

[0036] The concentrator is provided with a plurality of photoelectric sensors, and the plurality of photoelectric sensors are connected to the controller;

[0037] The controller obtains multi-angle light intensity data through multiple photoelectric sensors;

[0038] The controller controls the driving device to adjust the focusing mirror surface based on the comparison of the light intensity data.

[0039] It can be seen from the above technical solutions that the present invention has the following advantages:

[0040] The present invention uses an aluminum alloy lens and then sprays a silver solution on the aluminum alloy lens by a physical method, which helps to improve the utilization rate of solar radiation. When there is sufficient sunlight during the day, the concentrator will rotate with the position of the sun through the tracker, thereby concentrating the sunlight to the installation position of the collector. A plurality of heat collecting pipes are arranged on the top of the collector to improve the solar energy conversion efficiency in the form of a row of pipes. The present invention inputs the water in the softened water pool into the inlet of the collector, and transports the high-temperature steam generated in the collector to the outlet of the gas storage system and the steam turbine generator. The overall system of the present invention forms a circulation mode, improves the energy utilization rate, and prolongs the working time, which helps to increase the power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0042] Figure 1Schematic diagram of a solar thermal power generation system.

[0043] Figure 2 Schematic diagram of concentrated solar energy collection.

[0044] In the figure: 1- focusing mirror, 2- supporting column, 3- tracking device, 4- supporting base, 5- collecting tube, 6- steam condensation area, 7- softened water tank, 8- softened water treatment device, 9- raw water tank, 10- steam turbine generator, 11- heat storage device, 12- gas storage reflux device, 13- self-provided water source tank. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0047] The block diagrams shown in the drawings of the solar thermal power generation system provided by the present invention are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in one or more hardware modules or integrated circuits, or in different processor devices and / or microcontroller devices.

[0048] The present invention provides a solar thermal power generation system, such as Figure 1-2 As shown, it includes: a collector and a concentrator. The concentrator includes a concentrating mirror 1, a support column 2 and a support seat 4. The concentrating mirror 1 includes multiple aluminum alloy lenses, and the aluminum alloy lenses are sprayed with a silver solution. A tracker 3 is provided on the support column 2, and one end of the support column 2 is mechanically connected to the concentrating mirror 1. The tracker 3 adopts a solar tracker. The tracker 3 drives the concentrator to converge sunlight to the top of the collector. A plurality of heat collecting tubes 5 are provided on the top of the collector. The plurality of heat collecting tubes 5 are all connected to the steam condensation area 6. The inside of the collector is provided with a steam condensation area 6. The other end of the support column 2 is mechanically connected to the support seat 4 and fixed to the ground through the support seat 4.

[0049] The collector of the present invention has a cylindrical appearance, one side faces the new type of light collector, and the remaining three sides use insulation materials to receive sunlight to the greatest extent. There is a water inlet and an air outlet on the top, as well as an automatic control valve, a safety valve on each side, and a condensate return valve at the bottom to recycle the low-temperature condensed steam to the softening water tank 7 for recycling. Because the collector will cool down while generating high-temperature steam, and then condense into liquid, it is temporarily stored in the steam condensation area 6 in the collector and discharged when it reaches a certain water level. There is also a temperature probe connected to the controller inside the collector to detect the steam temperature inside the collector. The controller uses a single-chip microcomputer or PLC.

[0050] The support column 2 of the present invention and the focusing mirror surface 1 are provided with a driving device, the driving device is electrically connected to the controller, a plurality of photoelectric sensors are provided on the concentrator, and the plurality of photoelectric sensors are connected to the controller. The controller obtains multi-angle light intensity data through the plurality of photoelectric sensors, and the controller controls the driving device to adjust the focusing mirror surface 1 based on the comparison of the light intensity data. The present invention ensures that the concentrator focuses the sunlight to the top of the collector through the tracker 3, and at the same time, under the drive of the photoelectric sensor, the controller and the driving device, the sunlight is refracted by the mirror and concentrated to the focal length of the concentrator, that is, the installation position of the new collector.

[0051] The present invention also includes a softening water tank 7, a three-way valve, a heat storage device 11, a steam turbine generator 10, a softening water treatment device 8, a raw water tank 9, a self-provided water source box 13, a gas storage reflux device 12 and a controller. The specific connection method is that a water inlet is opened on one side of the collector, and the water outlet of the softening water tank 7 is connected to the water inlet of the collector. The first air outlet of the collector is connected to the first port of the three-way valve, the second port of the three-way valve is connected to the first air inlet of the steam turbine generator 10, and the third port of the three-way valve is connected to the air inlet of the heat storage device 11. The heat storage device 11 is a whole cylinder, the cylinder is cylindrical, and the two ends are convex (similar to a lying gas cylinder) and have a base. There is a condensate return valve at the bottom. There are two safety valves, an air inlet valve, an air outlet valve and an automatic control valve (including temperature and pressure) on the upper part.

[0052] The air outlet of the heat storage device 11 is connected to the second air inlet of the steam turbine generator 10. A condensate return pipe is provided at the bottom of the steam condensation area 6, and the collector is connected to the softened water tank 7 through the condensate return pipe. The water inlet of the softened water tank 7 is connected to the water outlet of the softened water treatment device 8, the water inlet of the softened water treatment device 8 is connected to the water outlet of the raw water tank 9, the first water inlet of the water tank is connected to the self-supplied water source box 13, and the second water inlet of the raw water tank 9 is connected to the drain outlet of the steam turbine generator 10. The air outlet of the gas storage reflux device 12 is connected to the water outlet of the softened water tank 7, and the first exhaust port of the steam turbine generator 10 is connected to the air inlet of the gas storage reflux device 12.

[0053] The steam turbine generator 10 adopts a horizontal structure, and the generator is matched with a steam turbine, an exciter, etc. to form a coaxially operated steam turbine generator set. The most basic components of the steam turbine generator 10 are the stator, the rotor, the excitation system and the cooling system. The channels for cooling the cooling medium are made in the stator core and the rotor core, and the winding water cooling adopts a hollow copper tube as a conductor. Water is passed through the tube for cooling. The cooling steam in the cavity is recycled to the softener for recycling, and the cooling water outside the cavity is not recycled. A first temperature probe is arranged inside to connect the controller to detect the steam temperature inside the steam turbine generator 10. The second exhaust port of the steam turbine generator 10 is connected to the second air outlet of the collector. A gate valve is arranged between the water inlet of the softened water treatment device 8 and the water outlet of the raw water tank 9, a liquid level control valve is arranged at the drain outlet of the steam turbine generator 10, a pneumatic valve is arranged at the second exhaust port of the steam turbine generator 10, and a safety valve is arranged on the heat storage device 11, the collector, the steam turbine generator 10, and the gas storage reflux device 12.

[0054] The present invention illustrates the focusing heat generation through the first embodiment.

[0055] When there is sufficient light, the concentrator will rotate according to the sun's position to receive and collect sunlight, and then collect the received sunlight onto the collector. Next, the collector will transmit the collected solar radiation energy to the heat-absorbing medium (water) input from the softening water tank 7, and then convert it into heat energy, thereby forming high-temperature steam. The collector of the present invention does not need to be installed above the concentrator, but the collector is placed at the focus of the concentrator, which effectively improves the day's lighting and concentrating efficiency and improves the heat collection effect.

[0056] On one hand, the high-temperature steam formed in the present invention passes through the heat storage device 11, which uses a concrete heat storage device 11, and then drives the circulation automatic control system to generate electricity; on the other hand, the high-temperature and high-pressure steam enters the steam turbine generator 10 to expand and do work, causing the blades to rotate and drive the circulation electronic system to generate electricity. The present invention recovers the steam condensed by the new collector, steam storage device, and steam turbine at low temperature through a pipeline system.

[0057] The concentrator of the present invention is composed of multiple aluminum alloy lenses and has a unique and ingenious structural design. Driven by a photoelectric sensor, a controller and a driving device, the sunlight is refracted by the mirror and concentrated to the focal length of the concentrator, which is the installation position of the new collector.

[0058] The principle of the present invention is that raw water is transported to the collector through the softening water treatment device 8. The collector receives the sunlight reflected by the focusing mirror 1 to generate high temperature, and then evaporates the water to form high-temperature steam, which is transported to the steam turbine power generation system for power generation. The high-temperature steam transported by the collector to the heat storage device 11 is used by the steam turbine generator 10 on cloudy days.

[0059] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar thermal power generation system, characterized in that: include: Collectors and concentrators; The concentrator comprises a concentrating mirror, a supporting column and a supporting seat; A tracker is provided on the support column, and one end of the support column is mechanically connected to the focusing mirror surface; The tracker drives the concentrator to focus the sunlight onto the top of the collector, which is equipped with multiple heat collecting tubes. The plurality of heat collecting tubes are connected to the steam condensation zone, and a steam condensation zone is provided inside the heat collector; The other end of the support column is mechanically connected to the support base and fixed to the ground through the support base; Also includes softening water tanks; A water inlet is provided on one side of the collector; The water outlet of the softening water tank is connected to the water inlet; A condensate return pipe is provided at the bottom of the steam condensation zone; The collector is connected to the softening water tank through the condensate return pipe; It also includes a softened water treatment unit, a raw water tank and a self-provided water source tank; The water inlet of the softening water tank is connected to the water outlet of the softening water treatment device; The water inlet of the softening water treatment device is connected to the water outlet of the raw water tank; The first water inlet of the raw water tank is connected to the self-provided water source tank, and the second water inlet of the raw water tank is connected to the drain outlet of the steam turbine generator; Also included is a gas storage reflux device; The air outlet of the air storage reflux device is connected to the water outlet of the softening water tank; The first exhaust port of the steam turbine generator is connected to the air inlet of the air storage reflux device; Also includes a controller; The support column and the focusing mirror are provided with a driving device, and the driving device is electrically connected to the controller; The concentrator is provided with a plurality of photoelectric sensors, and the plurality of photoelectric sensors are connected to the controller; The controller obtains multi-angle light intensity data through multiple photoelectric sensors; The controller controls the driving device to adjust the focusing mirror surface based on the comparison of the light intensity data.

2. The solar thermal power generation system according to claim 1, characterized in that: The focusing mirror surface includes multiple aluminum alloy lenses; The aluminum alloy lenses are sprayed with a silver solution.

3. The solar thermal power generation system according to claim 1, characterized in that: It also includes a three-way valve, a heat storage device and a steam turbine generator; The first air outlet of the collector is connected to the first port of the three-way valve, and the second port of the three-way valve is connected to the first air inlet of the steam turbine generator; The third port of the three-way valve is connected to the air inlet of the heat storage device, and the air outlet of the heat storage device is connected to the second air inlet of the steam turbine generator.

4. The solar thermal power generation system according to claim 3, characterized in that: The second exhaust port of the steam turbine generator is connected to the second air outlet of the collector.

5. The solar thermal power generation system according to claim 4, characterized in that: A gate valve is provided between the water inlet of the softening water treatment device and the water outlet of the raw water tank; A liquid level control valve is provided at the drain outlet of the steam turbine generator; A pneumatic valve is provided at the second exhaust port of the steam turbine generator; Safety valves are installed on the heat storage device, collector, steam turbine generator and gas storage reflux device.

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