A power generation and seawater desalination device based on solar-driven Stirling engine

Abstract

The present invention is a power generation and seawater desalination device based on solar energy driving Stirling engine, which mainly includes a Stirling engine heat source circulation unit, a Stirling engine transmission power generation and vacuum unit and a seawater desalination unit. The present invention does not require external power input, and only relies on solar energy to drive the Stirling engine to generate power. The power generated by the Stirling engine drives the transmission disk to rotate, part of the power drives the generator to generate electricity, and part of the power drives the vacuum piston to move, so as to achieve vacuumization, allowing seawater to evaporate in a vacuum environment, and achieve the purpose of seawater desalination. The device has the advantages of high solar energy utilization efficiency, high quality of fresh water, and the ability to simultaneously achieve power generation and desalination of seawater.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation and seawater desalination, and relates to a device capable of realizing power generation and seawater desalination simultaneously, and specifically, is a power generation and seawater desalination system based on a Stirling engine capable of efficiently utilizing solar energy. Background Art

[0002] Fresh water is closely related to human life and production. All aspects of our lives are inseparable from fresh water. However, global fresh water resources only account for 2.35% of global water resources, resulting in many countries and regions facing water shortages. Seawater desalination technology can effectively solve the problem of fresh water shortage in coastal areas.

[0003] The Stirling engine was invented by British physicist Robert Stirling in 1816, hence the name "Stirling engine". The Stirling engine outputs power through a cycle of cooling, compression, heat absorption and expansion of the working medium in the cylinder.

[0004] As a new type of material, liquid metal has significant advantages in heat dissipation and heat carrying due to its good thermal conductivity and fluidity.

[0005] In the patent document with patent publication number CN207740126U, a solar Stirling thermal power generation and seawater desalination thermoelectric synergistic combination utilization system is proposed. The mode transition between power generation and seawater desalination can be achieved by switching the position of the thermal oil heat exchanger and the Stirling engine. The shortcoming of the invention is that there is no way to achieve power generation and seawater desalination at the same time, and the operating temperature of the thermal oil cannot be too high, which limits the heat source temperature of the Stirling engine.

[0006] In the patent document with patent publication number CN104709955A, a dish-type solar desalination device is proposed, which realizes low-boiling-point evaporation of seawater by maintaining negative pressure in the distillation tank through a Stirling vacuum pump. However, it only realizes seawater desalination and does not achieve polygeneration.

[0007] In the patent document with patent publication number CN109205736A, a heat-driven free piston reverse osmosis seawater desalination power system based on Stirling cycle is proposed. The system uses the heat-driven free piston of Stirling cycle to provide power for reverse osmosis desalination seawater for seawater desalination. However, the power generated by the Stirling heat-driven free piston can only provide power for reverse osmosis desalination, and multiple production is not achieved. Moreover, the quality of fresh water produced is not as high as that produced by vacuum flash evaporation.

[0008] The present invention combines the existing technical conditions and some deficiencies in the above inventions, and proposes a power generation and seawater desalination device based on a solar-powered Stirling engine. While providing power to the generator, it also provides power to the vacuum cylinder piston to achieve seawater desalination, and the quality of the desalinated water is relatively high. Summary of the invention

[0009] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a power generation and seawater desalination device based on a solar-driven Stirling engine, which can simultaneously supply electricity and high-quality fresh water, and the operation of the system is stable and efficient.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A solar-powered Stirling engine-driven power generation and seawater desalination device, comprising: a Stirling engine heat source circulation unit, a Stirling engine transmission power generation and vacuum unit, and a seawater desalination unit.

[0012] The Stirling engine heat source circulation unit comprises a solar collector, a heat chamber, an electromagnetic pump, and a solar panel, wherein: the lower end outlet of the heat chamber is connected to the working fluid inlet of the electromagnetic pump through a pipeline; the working fluid outlet of the electromagnetic pump is connected to the upper end inlet of the heat chamber through a pipeline, the solar collector is arranged on the pipeline between the electromagnetic pump and the heat chamber, and is used to heat the liquid metal in the pipeline; the connection terminal of the solar panel is connected to the connection terminal of the electromagnetic pump through an electric wire;

[0013] The Stirling engine transmission power generation and vacuum unit comprises a Stirling engine cylinder, a cold end, a Stirling engine piston, a Stirling engine transmission crankshaft, a transmission plate, a generator, a vacuum cylinder crankshaft, and a vacuum cylinder piston, wherein: the Stirling engine cylinder and the Stirling engine piston form a closed space; the cold end is located at the right end of the Stirling engine cylinder and is wrapped by ribs; the right end of the Stirling engine piston is connected to the Stirling engine transmission crankshaft; the Stirling engine transmission crankshaft is connected to the transmission plate; the transmission plate is connected to the vacuum cylinder crankshaft; the vacuum cylinder crankshaft is connected to the vacuum cylinder piston; the transmission plate is externally connected to the generator;

[0014] The seawater desalination unit comprises a solar water heater, a condenser, a water collecting tank and a vacuum cylinder, wherein: the inlet of the solar water heater is connected to a water supply pipeline; the outlet of the solar water heater is connected to a liquid inlet valve of the vacuum cylinder through a pipeline; the air outlet valve of the vacuum cylinder is connected to the inlet of the condenser through a pipeline; and the outlet of the condenser is connected to the water collecting tank through a pipeline.

[0015] Preferably, the Stirling engine heat source circulation unit is also provided with a heat carrier, and the heat carrier is liquid metal, and the liquid metal is one of sodium potassium alloy and gallium indium alloy, which is used to provide a high-temperature heat source of 600-700°C for the hot end of the Stirling engine.

[0016] Preferably, the working medium in the cylinder of the Stirling engine is hydrogen, helium or a mixture thereof.

[0017] Preferably, the Stirling engine piston is movably sleeved inside the Stirling engine cylinder.

[0018] Preferably, the transmission disk is respectively provided with disk I, disk II and disk III, and the center points of disk I, disk II and disk III are all located in a straight line; disk I and disk II are connected by a central axis transmission; disk I and disk III are connected by a central axis transmission; disk III is also connected to the generator by a central axis transmission.

[0019] Preferably, the liquid inlet valve on the vacuum cylinder is installed in the middle position of the vacuum cylinder body, the exhaust valve is installed at the end of the vacuum cylinder body, and the liquid discharge valve is installed at the bottom end of the vacuum cylinder; the liquid inlet valve, liquid discharge valve and exhaust valve on the vacuum cylinder are all one-way valves.

[0020] Preferably, the cooling medium of the condenser can be seawater or air.

[0021] Preferably, the solar thermal collector is a tower solar thermal collector or a dish solar thermal collector.

[0022] Preferably, in the Stirling engine heat source circulation unit, except for the solar collector heating position, the remaining pipelines are wrapped with high temperature resistant heat preservation materials.

[0023] It can be seen from the above technical solutions that the power generation and seawater desalination device based on solar-driven Stirling engine of the present invention has the following technical advantages:

[0024] 1. The present invention uses a Stirling engine to drive a generator and a vacuum cylinder to complete the process of power generation and seawater desalination. It uses solar energy to provide external heat for the Stirling engine, and does not require additional energy input to achieve the co-generation of power generation and seawater desalination.

[0025] 2. The present invention utilizes the power generated by the piston of the Stirling engine to desalinate seawater, optimizes the transmission chain, reduces the number of energy conversions, and is conducive to improving energy utilization efficiency.

[0026] 3. The present invention can collect high-quality heat sources by utilizing liquid metal; at the same time, the hot end of the Stirling cylinder does not need to be fixed together with the solar collector, so the position of the solar collector is more flexible when collecting solar thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a power generation and seawater desalination device based on a solar-powered Stirling engine;

[0028] Figure 2 This is a schematic diagram of the position of the gas valve and liquid valve of the vacuum cylinder;

[0029] Figure 3 It is a schematic diagram of the transmission disc structure.

[0030] In the figure: solar collector 1, solar water heater 2, condenser 3, solar panel 4, electromagnetic pump 5, heat chamber 6, Stirling engine cylinder 7, Stirling engine piston 8, cold end 9, Stirling engine drive crankshaft 10, drive plate 11, vacuum cylinder crankshaft 12, vacuum cylinder piston 13, vacuum cylinder 14, water collecting tank 15, generator 16. DETAILED DESCRIPTION

[0031] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0032] like Figure 1-Figure 3 As shown, the power generation and seawater desalination device based on solar energy driven Stirling engine of the present invention mainly consists of solar collector 1, solar water heater 2, condenser 3, solar panel 4, electromagnetic pump 5, heat chamber 6, Stirling engine cylinder 7, Stirling engine piston 8, cold end 9, Stirling engine transmission crankshaft 10, transmission plate 11, vacuum cylinder crankshaft 12, vacuum cylinder piston 13, vacuum cylinder 14, water collecting box 15, generator 16 and other components. The power generation and seawater desalination device based on solar energy driven Stirling engine of the present invention can be divided into Stirling engine heat source circulation unit, Stirling engine transmission power generation and vacuum unit, and seawater desalination unit as a whole.

[0033] The heat source circulation unit of the Stirling engine includes a solar collector 1, a heat chamber 6, an electromagnetic pump 5, and a solar panel 4, wherein the outlet of the electromagnetic pump 5 is connected to the upper inlet of the heat chamber 6 through a pipeline, and the lower outlet of the heat chamber 6 is connected to the working medium inlet of the electromagnetic pump 5 through a pipeline, and the connecting pipeline between the two is provided with a solar collector 1 for heating the liquid metal in the pipeline; the wiring terminal of the solar panel 4 is connected to the wiring terminal of the electromagnetic pump 5 through an electric wire to provide power for the electromagnetic pump 5.

[0034] The Stirling engine transmission power generation and vacuum unit includes a Stirling engine cylinder 7, a cold end 9, a Stirling engine piston 8, a Stirling engine transmission crankshaft 10, a transmission plate 11, a generator 16, a vacuum cylinder crankshaft 12, and a vacuum cylinder piston 13, wherein the Stirling engine cylinder 7 and the Stirling engine piston 8 form a closed space, and the Stirling engine piston 8 reciprocates in the Stirling engine cylinder 7; the cold end 9 is located at the right end of the Stirling engine cylinder 7 and is wrapped by ribs; the right end of the Stirling engine piston 8 is connected to the Stirling engine transmission crankshaft 10; the Stirling engine transmission crankshaft 10 is connected to the transmission plate 11; the transmission plate 11 is connected to the vacuum cylinder crankshaft 12; the vacuum cylinder crankshaft 12 is connected to the vacuum cylinder piston 13; the transmission plate 11 is externally connected to the generator 16.

[0035] The seawater desalination unit includes a solar water heater 2, a vacuum cylinder 14, a condenser 3, and a water collecting tank 15, wherein the inlet of the solar water heater 2 is connected to a water supply pipeline, and the outlet of the solar water heater 2 is connected to the liquid inlet valve of the vacuum cylinder 14 through a pipeline; the exhaust valve of the vacuum cylinder 14 is connected to the inlet of the condenser 3 through a pipeline; and the outlet of the condenser 3 is connected to the water collecting tank 15 through a pipeline.

[0036] The Stirling engine heat source circulation unit is also provided with a heat carrier, and the heat carrier is liquid metal, and the liquid metal is one of sodium-potassium alloy and gallium-indium alloy, which is used to provide a high-temperature heat source of 600-700°C for the hot end of the Stirling engine.

[0037] The working medium in the Stirling engine cylinder 7 is hydrogen, helium or a mixture thereof.

[0038] The Stirling engine piston 8 is movably sleeved inside the Stirling engine cylinder 7 .

[0039] The transmission disc 11 is respectively provided with disc I, disc II and disc III, and the center points of disc I, disc II and disc III are all located in a straight line; disc I and disc II are connected by a central shaft transmission; disc I and disc III are connected by a central shaft transmission; disc III is also connected to the generator 16 by a central shaft transmission.

[0040] The inlet valve on the vacuum cylinder 14 is installed in the middle position of the vacuum cylinder 14 cylinder body, the exhaust valve is installed at the end of the vacuum cylinder 14 cylinder body, and the discharge valve is installed at the bottom of the vacuum cylinder 14; the inlet valve, discharge valve and exhaust valve on the vacuum cylinder 14 are all one-way valves.

[0041] The cooling medium of the condenser 3 can be seawater or air.

[0042] The solar thermal collector 1 is a tower type solar thermal collector or a dish type solar thermal collector.

[0043] In the heat source circulation unit of the Stirling engine, except for the heating position of the solar collector 1, the remaining pipelines are wrapped with high-temperature resistant heat preservation materials.

[0044] The solar-powered Stirling engine of the present invention realizes power generation and seawater desalination, and its working principle and specific operation process are as follows:

[0045] In the Stirling engine heat source circulation unit, the solar collector 1 heats the heat carrier liquid metal in the Stirling engine heat source circulation to 600-700°C, and flows into the heat chamber 6 through a pipeline; the electromagnetic pump 5 provides power for the liquid metal flow circulation, and the solar panel 4 provides an energy source for the electromagnetic pump; the liquid metal circulation flow keeps the heat chamber 6 at a temperature of 600-700°C, so that the hot end of the Stirling engine (it should be noted that the hot end refers to the heated part of the Stirling engine, not the heat chamber, but it is wrapped by the heat chamber) is in a high temperature environment.

[0046] In the Stirling engine transmission power generation and vacuum unit, the hydrogen or helium loaded in the Stirling engine cylinder 7 expands or contracts under the action of the hot chamber 6 and the cold end 9, pushing the Stirling engine piston 8 to reciprocate in the Stirling engine cylinder 7, and the Stirling engine transmission crankshaft 10 drives the disk I of the transmission disk 11 to rotate, and the disk I drives the disk II to rotate through the central axis, and the disk II drives the vacuum cylinder piston 13 to reciprocate through the vacuum cylinder crankshaft 12; when the vacuum cylinder piston 13 moves from the right end position to the left end position, the vacuum cylinder piston 13 performs a vacuuming process, and when the vacuum cylinder piston 13 moves from the left end position to the right end position, the vacuum cylinder piston 13 moves to the right to complete the exhaust and concentrated brine discharge process; the disk I of the transmission disk 11 is connected to the disk III, and the central axis of the disk III is connected to the generator 16 to generate electricity.

[0047] In the seawater desalination unit, seawater enters the solar water heater 2 through a pipeline, and the outlet of the solar water heater 2 is connected to the vacuum cylinder 14 liquid inlet valve through a pipeline. The power for seawater to enter the vacuum cylinder 14 comes from the pressure difference between the vacuum cylinder 14 and the outside world; the vacuum cylinder 14 air outlet valve is connected to the condenser 3 inlet through a pipeline, and the condenser 3 outlet is connected to the water collecting tank 15 through a pipeline; the seawater heated by the solar water heater 2 enters the vacuum cylinder 14 after the vacuum cylinder 14 completes the vacuum pumping process, and a part of it is flash evaporated, and the water vapor after flash evaporated enters the condenser 3 through the exhaust process of the vacuum cylinder 14 (it should be noted that the vacuum cylinder 14 is equivalent to a flash evaporator, and the liquid pressure is controlled by the liquid inlet valve to enter and then flash evaporate), and after being condensed, it enters the water collecting tank 15 through a pipeline. The fresh water obtained in the water collecting tank is used by people; a part of it becomes concentrated brine, which is discharged from the drain valve through a pipeline during the discharge process of the vacuum cylinder 14 and returns to the ocean.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power generation and seawater desalination device based on solar-driven Stirling engine, comprising: Stirling engine heat source circulation unit, Stirling engine transmission power generation and vacuum unit, seawater desalination unit, characterized in that: The Stirling engine heat source circulation unit comprises a solar collector, a heat chamber, an electromagnetic pump, and a solar panel, wherein: the lower end outlet of the heat chamber is connected to the working fluid inlet of the electromagnetic pump through a pipeline; the working fluid outlet of the electromagnetic pump is connected to the upper end inlet of the heat chamber through a pipeline, the solar collector is arranged on the pipeline between the electromagnetic pump and the heat chamber, and is used to heat the liquid metal in the pipeline; the connection terminal of the solar panel is connected to the connection terminal of the electromagnetic pump through an electric wire; The Stirling engine transmission power generation and vacuum unit comprises a Stirling engine cylinder, a cold end, a Stirling engine piston, a Stirling engine transmission crankshaft, a transmission plate, a generator, a vacuum cylinder crankshaft, and a vacuum cylinder piston, wherein: the Stirling engine cylinder and the Stirling engine piston form a closed space; the cold end is located at the right end of the Stirling engine cylinder and is wrapped by ribs; the right end of the Stirling engine piston is connected to the Stirling engine transmission crankshaft; the Stirling engine transmission crankshaft is connected to the transmission plate; the transmission plate is connected to the vacuum cylinder crankshaft; the vacuum cylinder crankshaft is connected to the vacuum cylinder piston; the transmission plate is externally connected to the generator; The seawater desalination unit includes a solar water heater, a condenser, a water collecting tank, and a vacuum cylinder, wherein: the inlet of the solar water heater is connected to a water supply pipeline; the outlet of the solar water heater is connected to the liquid inlet valve of the vacuum cylinder through a pipeline; the air outlet valve of the vacuum cylinder is connected to the inlet of the condenser through a pipeline; and the outlet of the condenser is connected to the water collecting tank through a pipeline.

2. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The Stirling engine heat source circulation unit is also provided with a heat carrier, and the heat carrier is a liquid metal, and the liquid metal is one of a sodium potassium alloy and a gallium indium alloy, which is used for The hot end of the Stirling engine provides a high temperature heat source of 600-700℃.

3. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The working medium in the cylinder of the Stirling engine is hydrogen, helium or a mixed gas thereof.

4. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The Stirling engine piston is movably sleeved inside the Stirling engine cylinder.

5. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The transmission disc is respectively provided with disc I, disc II and disc III, and the center points of disc I, disc II and disc III are all located in a straight line; disc I and disc II are connected by a central shaft transmission; disc I and disc III are connected by a central shaft transmission; disc III is also connected to the generator by a central shaft transmission.

6. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The liquid inlet valve on the vacuum cylinder is installed in the middle position of the vacuum cylinder body, the exhaust valve is installed at the end of the vacuum cylinder body, and the liquid discharge valve is installed at the bottom end of the vacuum cylinder; the liquid inlet valve, liquid discharge valve and exhaust valve on the vacuum cylinder are all one-way valves.

7. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The cooling medium of the condenser can be seawater or air.

8. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: The solar thermal collector is a tower type solar thermal collector or a dish type solar thermal collector.

9. The power generation and seawater desalination device based on solar-driven Stirling engine according to claim 1, characterized in that: In the Stirling engine heat source circulation unit, except for the solar collector heating position, the remaining pipelines are wrapped with high temperature resistant heat preservation materials.

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