CN112576465A - Solar energy combined cycle power generation system and method thereof - Google Patents
Solar energy combined cycle power generation system and method thereof Download PDFInfo
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- CN112576465A CN112576465A CN201910930681.4A CN201910930681A CN112576465A CN 112576465 A CN112576465 A CN 112576465A CN 201910930681 A CN201910930681 A CN 201910930681A CN 112576465 A CN112576465 A CN 112576465A
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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
- F03G6/02—Devices for producing mechanical power from solar energy using a single state working fluid
- F03G6/04—Devices for producing mechanical power from solar energy using a single state working fluid gaseous
- F03G6/045—Devices for producing mechanical power from solar energy using a single state working fluid gaseous by producing an updraft of heated gas or a downdraft of cooled gas, e.g. air driving an engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a solar combined cycle power generation system and a method, wherein the system comprises a high-temperature air heat absorber, a heat storage device, a gas compressor, a turbine and a steam generator; when the sunlight is sufficient, the high-temperature air heat absorber sucks air from the environment, the air is heated by focused sunlight, the air flows through the heat storage device and transfers heat to the heat storage device, and the high-temperature air discharged from the heat storage device enters a turbine to expand to do work and output electric energy to the outside; low-pressure air discharged from the turbine passes through a steam generator to generate steam for steam Rankine cycle power generation; low-temperature and low-pressure air from the steam generator enters the air compressor, is compressed and boosted by the air compressor and is finally discharged into the atmosphere; when the sunlight is insufficient or no sunlight exists, the heat storage device transfers the stored heat to the air, so that the system can continuously and stably operate.
Description
Technical Field
The invention relates to solar energy utilization, in particular to a solar energy combined cycle power generation system and a method thereof.
Background
With the huge consumption of traditional fossil energy, people face increasingly severe energy and environmental problems. A new energy technology revolution is to start with the improvement of energy utilization efficiency and the optimization of energy consumption structure. The improvement of the proportion of non-fossil energy, particularly the proportion of renewable energy, has important significance for future energy and environment. At present, the renewable energy accounts for only about 12 percent, and the renewable energy is already regarded as the strategic high point of the new generation energy technology. Renewable energy sources include water energy, wind energy, solar energy, biomass energy, geothermal energy, ocean energy, and the like. The solar energy is widely distributed, safe and clean, has huge total amount, is inexhaustible, is widely concerned, and is an important component in renewable energy.
At present, solar energy mainly has two aspects of heat utilization and electricity utilization. The heat utilization refers to the conversion of the light energy of sunlight into heat energy, such as a solar water heater. The electricity utilization mainly comprises photovoltaic power generation and photo-thermal power generation, the principle of the photovoltaic power generation is photovoltaic effect, when sunlight irradiates a photovoltaic cell, electromotive force is generated, and a load is connected to generate electric energy. The principle of photo-thermal power generation is that an absorber absorbs sunlight to serve as a high-temperature heat source, a hot working medium absorbs heat, the heat enters the next step of power circulation to generate mechanical energy, and a generator set is driven to generate power, and common forms of the photo-thermal power generation include a disc type system, a groove type system, a tower type system and the like. The solar photo-thermal power generation can combine low-cost energy storage, has stable output, can bear basic load, is quickly adjusted, can be used as a peak regulation power supply, can further improve the internet consumption capability of other unstable renewable energy sources, and has huge future development prospect.
In a solar photo-thermal power generation system, a steam Rankine cycle is basically adopted in a current commercial power cycle, and the working temperature is low, so the efficiency is low. With the development of the sunlight thermal technology, the working temperature of the working medium is continuously increased (more than 800 ℃), and the high-temperature gas turbine is concerned by people in circulation. The current solar gas turbine circulation needs to adopt a pressure-bearing high-temperature air heat absorber, namely, high-pressure air from an air compressor enters the pressure-bearing high-temperature air heat absorber, the air is heated to the required high temperature (more than 800 ℃) and then enters a turbine to expand to do work. Therefore, the pressure-bearing high-temperature air heat absorber is the key technology of the whole solar gas turbine system.
Air heat absorbers can be divided into tubular heat absorbers and positive displacement heat absorbers according to their heat transfer modes. The tubular heat absorber seals the pressure air in the tube through the metal tube. The focused solar energy is absorbed by the outer wall surface of the metal tube and converted into heat energy, and then the heat energy is transferred to the pressure air in the tube through the tube wall. Positive displacement heat absorbers typically utilize a transparent quartz glass window to seal the pressurized gas within the chamber. The focused solar energy is absorbed by the porous medium (honeycomb ceramic or foamed ceramic) in the cavity to convert the heat energy, and then the air is reheated. Since no metal material is used directly, the air can be heated to 1000 ℃ or even higher. Therefore, the positive displacement heat absorber has a greater advantage in terms of heat absorption temperature, but the positive displacement heat absorber needs to use sealing glass to ensure that concentrated solar energy can penetrate through the positive displacement heat absorber, and meanwhile, pressure gas is effectively sealed in the cavity. However, glass is brittle, easily contaminated, weak in thermal stress bearing capacity, easily broken, and short in service life. In addition, the inlet glass of the cavity has high bearing pressure, so the area cannot be large, and the glass of a quartz medium is required, so the manufacturing cost is high. Therefore, the pressurized high-temperature air heat absorber with the quartz glass window is the biggest obstacle for further popularization of the technology.
Disclosure of Invention
The invention provides a solar combined circulating system aiming at the defects of the solar gas turbine and the pressure-bearing high-temperature air heat absorber with the quartz glass window, avoids the application of the pressure-bearing high-temperature air heat absorber with the quartz glass window, improves the system reliability, reduces the cost and promotes the industrialization.
The specific scheme of the invention is as follows:
a solar energy combined cycle power generation system is characterized by comprising a high-temperature air heat absorber, a heat storage device, a gas compressor and a turbine, when the sunlight is sufficiently illuminated, low-temperature normal-pressure air flows into the high-temperature air heat absorber and is heated by concentrated solar energy, the heated high-temperature air enters the heat storage device and transfers heat to the heat storage device, air flowing out of the heat storage device enters the turbine to expand and do work, and low-pressure air flowing out of the turbine is compressed and boosted by the gas compressor and is discharged into the environment; when sunlight is insufficient or no sunlight exists, ambient air flows into the high-temperature air heat absorber and then enters the heat storage device or directly flows into the heat storage device, the heat storage device transfers heat to the air, the heated air enters the turbine to expand and do work, and low-pressure air coming out of the turbine is compressed and boosted by the air compressor and then discharged into the environment.
Furthermore, a heat exchanger is additionally arranged behind the turbine and used for cooling low-pressure air from the turbine and reducing the inlet temperature of the air compressor, so that the power consumption of the air compressor is reduced, and the system efficiency is improved. Preferably, the heat exchanger is a steam generator, air from the turbine enters the hot side of the steam generator to heat water medium on the cold side of the steam generator to generate high-temperature and high-pressure steam, and the steam enters the steam turbine to do work, so that the output power of the system is increased, and the efficiency of the system is improved.
The high-temperature air heat absorber is an open-type air heat absorber and is directly communicated with the atmospheric environment, namely the working pressure is atmospheric pressure, so that the adoption of a pressure-bearing high-temperature air heat absorber is avoided, the reliability of the heat absorber is improved, and the cost is reduced.
The high-temperature air heat absorber is internally filled with a solid heat absorbing medium. When the sunlight is sufficiently irradiated, the solid heat-absorbing medium absorbs the focused sunlight, the temperature is increased, and the flowing air is heated, so that the energy flow in the high-temperature air heat absorber is in the direction from the focused sunlight to the solid heat-absorbing medium in the heat absorber to the air, and the heat storage device utilizes the high-temperature air to heat the heat-storing medium in the heat storage device; when the sunlight is insufficient or absent, i.e. the air temperature is lower than the temperature of the heat storage medium in the heat storage device, the energy flow is transmitted in the direction from the heat storage medium to the air, i.e. the air is heated by the heat storage medium. The heat absorbing medium of the high-temperature air heat absorber is one or more of honeycomb ceramics, foamed metal and wire mesh; the heat storage medium of the heat storage device is one or more of honeycomb ceramics, foamed metal, a wire mesh, piled gravel, phase-change materials and thermochemical heat storage materials. Because the high-temperature air heat absorber and the heat storage device are filled with media with air flow channels, as an improved scheme, the high-temperature air heat absorber and the heat storage device are arranged into a whole, and heat loss is reduced.
The air exiting the compressor is at a temperature above ambient temperature. In order to fully utilize the heat energy exhausted by the compressor, an exhaust outlet of the compressor is arranged at an inlet of the high-temperature air heat absorber. When the system works, air exhausted from the air compressor is mixed with low-temperature environment air near the inlet of the high-temperature air heat absorber and then enters the high-temperature air heat absorber, so that the inlet temperature of the heat absorber is increased, the heat absorption capacity is reduced, and the system efficiency is improved.
In addition, the invention provides a solar combined cycle power generation system which comprises a high-temperature air heat absorber, a heat storage device, a gas compressor, a turbine and a steam generator, wherein an inlet of the high-temperature air heat absorber is directly communicated with the atmosphere, an outlet of the high-temperature air heat absorber is connected with an inlet of the heat storage device, an outlet of the heat storage device is connected with an inlet of the turbine, an outlet of the turbine is connected with a working medium inlet at the hot side of the steam generator, and a working medium outlet at the hot side of the steam generator is connected with an. Preferably, the compressor outlet is arranged at the inlet of the hot air heat absorber or at the inlet of the heat storage device.
The compressor is a device capable of providing compressed gas; the turbine is a device which utilizes high-temperature pressure gas to do work; the heat storage device is a device for temporarily storing heat by using sensible heat, latent heat or chemical energy; the high-temperature air heat absorber is a device for heating air by utilizing focused solar energy.
Drawings
FIG. 1 is a schematic view of embodiment 1;
FIG. 2 is a schematic view of embodiment 2;
FIG. 3 is a schematic view of embodiment 3;
FIG. 4 is a schematic view of embodiment 4;
fig. 5 is a schematic diagram of embodiment 5.
In the figure: 1-high temperature air heat absorber; 2-a heat storage device; 3-turbine; 4, an air compressor; 5-a generator; 6-a steam generator; 7-bypass valve.
Detailed Description
Example 1
As shown in fig. 1, a solar combined cycle power generation system includes a high-temperature air heat absorber 1, a heat storage device 2, a turbine 3, a compressor 4 and a generator 5. When the sunlight is sufficient, the sunlight is focused to heat the solid heat-absorbing medium in the high-temperature air heat absorber 1, the air sucked from the environment is heated, the temperature is increased, and the heating temperature can be over 800 ℃; high-temperature air flows into the heat storage device 2 to heat the heat storage medium in the heat storage device 2; high-temperature air flowing out of the heat storage device 2 enters the turbine 3 to perform expansion work, low-pressure air flowing out of the turbine 3 enters the air compressor 4, and air compressed and boosted by the air compressor 4 is discharged into the atmospheric environment; when the sunlight is insufficient or not available, the air flows through the high-temperature air heat absorber 1 and the heat storage device 2 in sequence, and because the air temperature is lower than the temperature of the heat storage medium in the heat storage device 2, the heat storage medium releases heat, heats the air temperature, and then enters the turbine 3 to do work. The heat storage device 2 enables the system to operate efficiently and stably, and controllability and economical efficiency of the system are improved.
The turbine 3 and the compressor 4 are connected with the generator 5 through a shaft, and the generator 5 outputs electric energy outwards. The heat absorbing medium of the high-temperature air heat absorber 1 is one or more of honeycomb ceramics, foamed metal and wire mesh; the heat storage medium of the heat storage device 2 is one or more of honeycomb ceramics, foamed metal, a wire mesh, piled gravel, a phase change material and a thermochemical heat storage material.
Example 2
As shown in fig. 2, in embodiment 1, since air flows through the high-temperature air heat absorber 1 and the heat storage device 2 in this order and the filling medium having the airflow channel is disposed inside both, the high-temperature air heat absorber 1 and the heat storage device 2 can be disposed together, thereby improving the system compactness. When the sunlight is sufficient, the heat is transferred to the air by the high-temperature air heat absorber 1 and transferred to the heat storage medium in the heat storage device 2 through the air; when the sunlight is insufficient or absent, namely the air temperature is lower than the temperature of the heat storage medium in the heat storage device 2, the heat storage device releases heat, the air temperature is increased, and the system can stably operate.
Example 3
As shown in fig. 3, embodiment 1 is further modified, and the main modification is to arrange a steam generator 6 at the outlet of the turbine 3. When the system works, the air coming out of the turbine 3 is heated to more than 500 ℃, can be used for heating the steam generator 6, heats the water working medium to generate high-temperature and high-pressure steam, and enters the steam turbine to do work, so that the system efficiency is improved. The invention combines the gas turbine cycle and the steam Rankine cycle, can improve the heat efficiency of the whole system from conventional 40% to more than 50%, and greatly improves the economic benefit.
Example 4
As shown in fig. 4, in embodiment 3, the outlet of the compressor 4 is arranged near the inlet of the hot air heat absorber 1. The temperature of the air at the outlet of the air compressor 4 is higher than the ambient temperature and can reach more than 100 ℃. According to the arrangement of fig. 4, when the system is in operation, the air at the outlet of the compressor 4 is mixed with the ambient air, increasing the air inlet temperature of the high temperature air heat absorber 1, reducing the required solar energy and thus increasing the system efficiency.
Example 5
As shown in fig. 5, the embodiment 4 is further modified, the outlet of the compressor 4 is arranged near the inlet of the high-temperature air heat absorber 1, and a bypass pipeline is arranged to directly connect the outlet of the compressor 4 with the inlet of the heat storage device. When sunlight is sufficient, the bypass valve 7 is closed, so that air at the outlet of the air compressor 4 is mixed with ambient air and then enters the high-temperature air heat absorber 1, the required heat absorption capacity is reduced, and the system efficiency is improved; when sunlight is insufficient or no sunlight exists, the bypass valve 7 is opened, so that air at the outlet of the air compressor 4 directly enters the inlet of the heat storage device 2, and the air is prevented from being mixed with low-temperature air of the environment.
Claims (10)
1. A solar energy combined cycle power generation method is characterized in that: when the solar illumination condition is good, low-temperature air flows into the high-temperature air heat absorber and is heated by concentrated solar energy, the heated high-temperature air enters the heat storage device and transfers heat to the heat storage device, air flowing out of the heat storage device enters the turbine to expand and do work, and low-pressure air flowing out of the turbine is compressed by the air compressor and is boosted and discharged; when sunlight is insufficient or no sunlight exists, low-temperature air flows into the high-temperature air heat absorber and then enters the heat storage device or the low-temperature air directly flows into the inlet of the heat storage device, the heat storage device transfers heat to the air, the heated air enters the turbine to expand and do work, and low-pressure air coming out of the turbine is compressed by the air compressor to be boosted and discharged.
2. The solar energy combined cycle power generation method of claim 1, wherein the air exhausted from the turbine flows through a heat exchanger for cooling air, and the cooled low-temperature and low-pressure air enters the compressor, so that the power consumption of the compressor is reduced, and the system efficiency is improved.
3. The solar energy combined cycle power generation method of claim 2, wherein the heat exchanger is a steam generator, and air from the turbine flows through the steam generator for heating a water working medium to generate high-temperature and high-pressure steam, and the steam enters a steam turbine to do work, thereby improving system efficiency.
4. A solar energy combined cycle power generation method according to claim 1, wherein said high temperature air heat absorber is an open air heat absorber, and is directly connected to the atmospheric environment, i.e. the working pressure is atmospheric pressure.
5. The solar energy combined cycle power generation method according to claim 4, wherein the high temperature air heat absorber is used for absorbing high power solar light by using a solid heat absorbing medium therein, increasing the temperature of the medium, and then transferring heat to air, increasing the temperature of the air; when sunlight is sufficient, the heat storage medium in the heat storage device is heated by air heated by the high-temperature air heat absorber, and when sunlight is insufficient, namely the air temperature is lower than the temperature of the heat storage medium, the heat storage device releases heat, so that the heat is transferred to the air, and the air temperature is increased.
6. A solar energy combined cycle power generation method according to claim 1, wherein the high temperature air heat absorber and the heat storage device are provided with gas flow channels inside, and the high temperature air heat absorber and the heat storage device are arranged as a whole, and air flows through the high temperature air heat absorber and the heat storage device in sequence.
7. A solar energy combined cycle power generation method according to claim 1, wherein the heat absorbing medium of the high temperature air heat absorber is one or more of honeycomb ceramics, foamed metal, and wire mesh; the heat storage medium of the heat storage device is one or more of honeycomb ceramics, foamed metal, a wire mesh, piled gravel, phase-change materials and thermochemical heat storage materials.
8. A solar combined cycle power generation method according to claim 1, wherein the compressor outlet is arranged at the inlet of the hot air heat sink or at the inlet of the heat storage device, such that the compressor outlet air enters the hot air heat sink or the heat storage device.
9. The utility model provides a solar energy combined cycle power generation system, its characterized in that includes high temperature air heat absorber, heat-retaining device, compressor, turbine, steam generator, high temperature air heat absorber import directly communicates with each other with the atmosphere, high temperature air heat absorber export with the heat-retaining device import links to each other, the heat-retaining device export with the turbine import links to each other, and the turbine export links to each other with steam generator hot side working medium import, steam generator hot side working medium export with the compressor import links to each other.
10. A solar combined cycle power generation system according to claim 9, wherein said compressor outlet is arranged at said hot air heat sink inlet or at said heat storage device inlet.
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| CN201910930681.4A CN112576465A (en) | 2019-09-29 | 2019-09-29 | Solar energy combined cycle power generation system and method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104197537A (en) * | 2014-09-24 | 2014-12-10 | 中国科学院电工研究所 | Positive displacement air thermal absorber with rotary heat absorption body |
| CN104896764A (en) * | 2015-04-29 | 2015-09-09 | 南京瑞柯徕姆环保科技有限公司 | Solar thermal power generation method and device |
| US20160069329A1 (en) * | 2013-05-28 | 2016-03-10 | Peterbrod Corp. | Advanced solar thermally driven power system and method |
| CN108301927A (en) * | 2016-08-12 | 2018-07-20 | 浙江大学 | Solar energy high-temperature heat collection heat accumulation gas turbine generating set |
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2019
- 2019-09-29 CN CN201910930681.4A patent/CN112576465A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160069329A1 (en) * | 2013-05-28 | 2016-03-10 | Peterbrod Corp. | Advanced solar thermally driven power system and method |
| CN104197537A (en) * | 2014-09-24 | 2014-12-10 | 中国科学院电工研究所 | Positive displacement air thermal absorber with rotary heat absorption body |
| CN104896764A (en) * | 2015-04-29 | 2015-09-09 | 南京瑞柯徕姆环保科技有限公司 | Solar thermal power generation method and device |
| CN108301927A (en) * | 2016-08-12 | 2018-07-20 | 浙江大学 | Solar energy high-temperature heat collection heat accumulation gas turbine generating set |
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