CN111379678A - Solar photo-thermal power generation system - Google Patents
Solar photo-thermal power generation system Download PDFInfo
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- CN111379678A CN111379678A CN201811652800.6A CN201811652800A CN111379678A CN 111379678 A CN111379678 A CN 111379678A CN 201811652800 A CN201811652800 A CN 201811652800A CN 111379678 A CN111379678 A CN 111379678A
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- molten salt
- tank
- stirling engine
- power generation
- salt tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a solar photo-thermal power generation system, which comprises: the device comprises at least one Stirling engine (5), a molten salt tank (6), a mirror field (10), molten salt liquid and a plurality of guide pipes; the molten salt tank (6) is connected with the mirror field (10) through a plurality of conduits; the hot end of the Stirling engine (5) is inserted into the molten salt tank (6); the molten salt is stored in the molten salt tank (6) through the plurality of conduits after absorbing solar thermal energy through a mirror field (10); the molten salt liquid of the molten salt tank (6) is provided with a first position and a second position; the first position is higher than the second position; when the molten salt solution is at a first position, the Stirling engine (5) works; and when the molten salt solution is at the second position, the Stirling engine (5) stops working. The Stirling engine is used as the prime motor, so that the requirement of auxiliary equipment in the thermal power generation system is greatly reduced, the energy conversion efficiency is higher than that of a steam turbine, and the solar energy utilization efficiency is improved.
Description
Technical Field
The invention belongs to the field of photo-thermal power generation. In particular to a solar photo-thermal power generation system.
Background
At present, the solar-thermal power generation system utilizes fused salt to store solar heat energy, high-temperature fused salt is extracted to exchange heat with water during power generation, superheated steam is generated to push a steam turbine to rotate for power generation, and the method is low in power generation efficiency. In addition, during the circulating heat exchange process of the molten salt, a large number of auxiliary devices such as a molten salt pump, a molten salt flowmeter, a molten salt valve and the like are involved, the equipment cost is high, the energy consumption is high, and meanwhile, potential safety hazards such as leakage, freezing, blockage and the like also exist in a molten salt heat exchange loop.
Disclosure of Invention
The invention provides a solar photo-thermal power generation system, which comprises: the device comprises at least one Stirling engine (5), a molten salt tank (6), a mirror field (10), molten salt liquid and a plurality of guide pipes;
the molten salt tank (6) is connected with the mirror field (10) through a plurality of conduits; the hot end of the Stirling engine (5) is inserted into the molten salt tank (6);
the molten salt is stored in the molten salt tank (6) through the plurality of conduits after absorbing solar thermal energy through a mirror field (10);
the molten salt liquid of the molten salt tank (6) is provided with a first position and a second position; the first position is higher than the second position; when the molten salt solution is at a first position, the Stirling engine (5) works; and when the molten salt solution is at the second position, the Stirling engine (5) stops working.
Preferably, the system also comprises a molten salt tank (8), a molten salt valve (9) and a molten salt pump (7);
the molten salt tank (8) is connected with the molten salt tank (6) through the plurality of guide pipes after being respectively connected with the molten salt valve (9) and the molten salt pump (7) through the plurality of guide pipes to form a loop;
when the molten salt valve (9) is opened, the molten salt pump (7) drives the molten salt to move in the molten salt tank (8) and the molten salt trough (6).
Preferably, the molten salt in the molten salt tank (8) comprises a third position, and when the molten salt in the molten salt tank (6) is the second position, the molten salt in the molten salt tank (8) is located at the third position.
Preferably, the molten salt tank (8) is arranged at a high position, and the vertical position of the bottom of the tank body is higher than the molten salt tank (6).
Preferably, the molten salt valve (9) adopts an electric ball valve, and is used for freely adjusting the opening of the valve and controlling the molten salt reflux speed.
Preferably, the Stirling engine (5) comprises a generator (1), a speed reducer (2) and a crank-link mechanism (3);
the Stirling engine (5) is connected through the crank connecting rod mechanism (3) and is connected with the generator (1) through the speed reducer (2) to generate electricity;
and a circulating cooling water (4) jacket is arranged on the outer side of the Stirling engine (5) to absorb heat.
Preferably, the Stirling engine (5) is linearly fixed to the top of the molten salt tank (6), and the hot end of the Stirling engine (5) is slightly higher than the second position of the molten salt solution.
Preferably, when the Stirling engine (5) generates electricity, the speed reducer (2) adjusts the rotating speed to 1500 revolutions to drive the synchronous machine to rotate for generating electricity.
Preferably, the system further comprises a temperature sensor and a liquid level sensor;
the temperature sensor and the liquid level sensor are arranged in the molten salt tank.
Preferably, the system further comprises a molten salt stirrer (11);
the molten salt stirrer (11) is arranged at the top of the molten salt tank (6) and is used for stirring the molten salt in the molten salt tank (6).
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention provides a solar photo-thermal power generation system, which comprises: the device comprises at least one Stirling engine (5), a molten salt tank (6), a mirror field (10), molten salt liquid and a plurality of guide pipes; the molten salt tank (6) is connected with the mirror field (10) through a plurality of conduits; the hot end of the Stirling engine (5) is inserted into the molten salt tank (6); the molten salt is stored in the molten salt tank (6) through the plurality of conduits after absorbing solar thermal energy through a mirror field (10); the molten salt liquid of the molten salt tank (6) is provided with a first position and a second position; the first position is higher than the second position; when the molten salt solution is at a first position, the Stirling engine (5) works; and when the molten salt solution is at the second position, the Stirling engine (5) stops working. The Stirling engine is used as the prime motor, so that the requirement of auxiliary equipment in the thermal power generation system is greatly reduced, the energy conversion efficiency is higher than that of a steam turbine, and the solar energy utilization efficiency is improved.
(2) The invention provides a solar photo-thermal power generation system, wherein a molten salt tank (8) is connected with a molten salt tank (6) through a plurality of guide pipes to form a loop after being connected with a molten salt valve (9) and a molten salt pump (7) respectively; when the molten salt valve (9) is opened, the molten salt pump (7) drives the molten salt to move in the molten salt tank (8) and the molten salt trough (6). The invention has low equipment cost and low energy consumption, and meanwhile, the fused salt heat exchange loop is not leaked, frozen, blocked and the like.
Drawings
FIG. 1 is a block diagram of a solar photo-thermal power generation system of a Stirling engine;
in the figure: 1-a generator; 2-a reducer; 3-crank link mechanism; 4-circulating cooling water; 5-a stirling engine; 6-molten salt tank; 7-molten salt pump; 8-molten salt tank; 9-molten salt valve; 10-mirror field; 11-molten salt stirrer.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1:
the components are shown in figure 1, wherein the molten salt liquid level in the molten salt tank 6 is at the point A, and the molten salt does not exist in the molten salt tank 6 during full power generation. When the power generation power needs to be adjusted, the molten salt is pumped to the molten salt tank 8 by using the molten salt pump 7, when the liquid level of the molten salt in the tank reaches the point B, the output power is 0, and at the moment, the liquid level of the molten salt in the molten salt tank 8 reaches the point C, so that the molten salt circulation of the mirror field 10 is not influenced in the whole process. When power is required to be increased, the molten salt valve 9 is opened, and molten salt is injected into the molten salt tank 6 until the output power reaches a target value.
Example 2:
the molten salt is stored in a molten salt tank 6 after absorbing solar heat energy through a mirror field 10, and a molten salt stirrer 11, a temperature sensor and a plurality of reciprocating Stirling engines 5 are arranged at the top of the molten salt tank 6. The hot end of the Stirling engine 5 is inserted into the molten salt tank 8 and fully contacted with molten salt, and the cold end adopts a circulating cooling water 4 jacket to absorb heat. The multiple Stirling engines 5 are connected by a crank connecting rod mechanism 3 and are connected with a generator 1 through a speed reducer 2 to generate electricity.
When the output of the engine needs to be reduced, part of molten salt is pumped out of the molten salt tank 8 by using the molten salt pump 7 and stored in the molten salt tank 8 for heat preservation, the liquid level of the molten salt is reduced, the heat absorption capacity of the hot end of the Stirling engine 5 is reduced, and the output is reduced. The power generation is stopped immediately after the hot end is lost, and the residual molten salt in the molten salt tank 6 still meets the requirement of the mirror field 10 for cyclic heat absorption. The Stirling engine 5 is used as a prime mover, the requirement for auxiliary equipment in the photo-thermal power generation system is greatly reduced, the energy conversion efficiency is higher than that of a steam turbine, and the solar energy utilization efficiency is improved.
Example 3:
the fused salt pipeline of the photo-thermal mirror field 10 is connected with the fused salt tank 6, the lowest fused salt liquid level meeting fused salt circulation of the mirror field 10 is determined, the multiple Stirling engines 5 are linearly fixed at the top of the fused salt tank 6, and the hot end of the generator 1 is ensured to be slightly higher than the lowest fused salt liquid point. The molten salt tank 8 is arranged at a high position, and the vertical position of the bottom of the tank body is higher than the molten salt tank 6, so that the molten salt in the molten salt tank 8 can completely and naturally flow back to the molten salt tank 6. The salt inlet of the molten salt pump 7 is positioned at the bottom of the molten salt tank 6, the salt outlet is arranged at the top of the molten salt tank 8, and the flow of the molten salt pump 7 meets the requirement of liquid level regulation speed. The fused salt backflow pipeline is respectively positioned at the bottom of the fused salt tank 8 and the top of the fused salt groove 6, the fused salt valve 9 adopts an electric ball valve, the opening of the valve can be freely adjusted, and the fused salt backflow speed is controlled.
The Stirling engine 5 is connected with the generator 1 through the crank link mechanism 3 and the speed reducer 2. During power generation, the speed reducer 2 adjusts the rotating speed to 1500 revolutions to drive the synchronous machine to rotate for power generation. A temperature sensor and a liquid level sensor are arranged in the molten salt tank 6 at the same time, and the system automatically adjusts the liquid level of the molten salt according to the target power and the real-time temperature of the molten salt, so that the power is stable and controllable.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A solar photo-thermal power generation system, comprising: the device comprises at least one Stirling engine (5), a molten salt tank (6), a mirror field (10), molten salt liquid and a plurality of guide pipes;
the molten salt tank (6) is connected with the mirror field (10) through a plurality of conduits; the hot end of the Stirling engine (5) is inserted into the molten salt tank (6);
the molten salt is stored in the molten salt tank (6) through the plurality of conduits after absorbing solar thermal energy through a mirror field (10);
the molten salt liquid of the molten salt tank (6) is provided with a first position and a second position; the first position is higher than the second position; when the molten salt solution is at a first position, the Stirling engine (5) works; and when the molten salt solution is at the second position, the Stirling engine (5) stops working.
2. The solar photo-thermal power generation system according to claim 1, further comprising a molten salt tank (8), a molten salt valve (9) and a molten salt pump (7);
the molten salt tank (8) is connected with the molten salt tank (6) through the plurality of guide pipes after being respectively connected with the molten salt valve (9) and the molten salt pump (7) through the plurality of guide pipes to form a loop;
when the molten salt valve (9) is opened, the molten salt pump (7) drives the molten salt to move in the molten salt tank (8) and the molten salt trough (6).
3. The solar photo-thermal power generation system according to claim 2, wherein the molten salt liquid in the molten salt tank (8) comprises a third position, and when the molten salt liquid in the molten salt tank (6) is in the second position, the molten salt liquid in the molten salt tank (8) is in the third position.
4. The solar photo-thermal power generation system according to claim 2, wherein the molten salt tank (8) is arranged in a high position, and the bottom of the tank body is vertically higher than the molten salt tank (6).
5. The solar photo-thermal power generation system according to claim 2, wherein the molten salt valve (9) is an electric ball valve and is used for freely adjusting the opening of the valve and controlling the backflow speed of the molten salt.
6. The solar photothermal power system according to claim 1, wherein said stirling engine (5) comprises a generator (1), a speed reducer (2), a crank-link mechanism (3);
the Stirling engine (5) is connected through the crank connecting rod mechanism (3) and is connected with the generator (1) through the speed reducer (2) to generate electricity;
and a circulating cooling water (4) jacket is arranged on the outer side of the Stirling engine (5) to absorb heat.
7. The solar photo-thermal power generation system according to claim 6, wherein the Stirling engine (5) is linearly fixed on the top of the molten salt tank (6), and the hot end of the Stirling generator (5) is slightly higher than the second position of the molten salt liquid.
8. The solar photo-thermal power generation system according to claim 6, wherein when the Stirling engine (5) generates power, the speed reducer (2) adjusts the rotating speed to 1500 revolutions to drive the synchronous machine to rotate for power generation.
9. The solar photothermal power system according to claim 1 further comprising a temperature sensor and a liquid level sensor;
the temperature sensor and the liquid level sensor are arranged in the molten salt tank.
10. A solar photo-thermal power generation system according to claim 1, characterized in that said system further comprises a molten salt stirrer (11);
the molten salt stirrer (11) is arranged at the top of the molten salt tank (6) and is used for stirring the molten salt in the molten salt tank (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811652800.6A CN111379678B (en) | 2018-12-29 | 2018-12-29 | Solar photo-thermal power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811652800.6A CN111379678B (en) | 2018-12-29 | 2018-12-29 | Solar photo-thermal power generation system |
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| Publication Number | Publication Date |
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| CN111379678A true CN111379678A (en) | 2020-07-07 |
| CN111379678B CN111379678B (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811652800.6A Active CN111379678B (en) | 2018-12-29 | 2018-12-29 | Solar photo-thermal power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343731A (en) * | 2020-10-22 | 2021-02-09 | 上海齐耀动力技术有限公司 | Power generation control method and system for molten salt Stirling engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745749A (en) * | 1983-07-29 | 1988-05-24 | New Process Industries, Inc. | Solar powered free-piston stirling engine |
| CN201963504U (en) * | 2011-03-14 | 2011-09-07 | 张建城 | Medium low-temperature Stirling generating arranged of groove solar |
| CN106321382A (en) * | 2016-09-07 | 2017-01-11 | 华中科技大学 | Solar photothermal combined power generation system |
| CN110792566A (en) * | 2018-08-01 | 2020-02-14 | 赫普科技发展（北京）有限公司 | Photo-thermal molten salt heat storage Stirling power generation system and method |
-
2018
- 2018-12-29 CN CN201811652800.6A patent/CN111379678B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4745749A (en) * | 1983-07-29 | 1988-05-24 | New Process Industries, Inc. | Solar powered free-piston stirling engine |
| CN201963504U (en) * | 2011-03-14 | 2011-09-07 | 张建城 | Medium low-temperature Stirling generating arranged of groove solar |
| CN106321382A (en) * | 2016-09-07 | 2017-01-11 | 华中科技大学 | Solar photothermal combined power generation system |
| CN110792566A (en) * | 2018-08-01 | 2020-02-14 | 赫普科技发展（北京）有限公司 | Photo-thermal molten salt heat storage Stirling power generation system and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343731A (en) * | 2020-10-22 | 2021-02-09 | 上海齐耀动力技术有限公司 | Power generation control method and system for molten salt Stirling engine |
| CN112343731B (en) * | 2020-10-22 | 2023-10-10 | 上海齐耀动力技术有限公司 | Fused salt Stirling engine power generation control method and system |
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| CN111379678B (en) | 2022-06-21 |
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