CN214464562U - Mixture transcritical circulation solar photo-thermal power generation system - Google Patents
Mixture transcritical circulation solar photo-thermal power generation system Download PDFInfo
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- CN214464562U CN214464562U CN202120653849.4U CN202120653849U CN214464562U CN 214464562 U CN214464562 U CN 214464562U CN 202120653849 U CN202120653849 U CN 202120653849U CN 214464562 U CN214464562 U CN 214464562U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The utility model discloses a critical circulation solar photothermal power system is striden to mixture, this system is including the turbine, high temperature regenerator, middle temperature regenerator, vapour and liquid separator, liquid pump, low temperature regenerator, precooler, main compressor, low temperature fused salt heater, the high temperature fused salt heater that communicate in proper order. In the system adopt H2O and C2The mixture of O is used as working medium, the working medium is in supercritical mixing state at high-temperature position, and part of H is at low-temperature position2O and CO2Separation of CO2Compression and pressure increase by compressor, H2And O is pressurized by a water pump. The system has higher heat efficiency than the traditional steam circulation efficiency, and simultaneously, the fused salt heat release interval is more than the classical supercritical CO2The Brayton cycle has a large heat release interval and small molten salt demand. Meanwhile, the phenomena of liquid carrying in the gas compression process and vaporization in the liquid compression process are avoided. The safety and stability of the equipment are improved.
Description
Technical Field
The utility model relates to a power generation system technical field, in particular to critical circulation solar photothermal power system is striden to mixture.
Background
Solar thermal power generation requires more efficient thermodynamic cycles for thermoelectric conversion, and the supercritical brayton cycle is the most advantageous cycle form among the numerous thermodynamic cycles at present. The novel supercritical working media such as carbon dioxide, helium and nitrous oxide have the inherent advantages of high energy density, high heat transfer efficiency, simple system and the like, can greatly improve the heat-power conversion efficiency, reduce the equipment volume and have very high economical efficiency.
However, such a cycle also presents a significant technical difficulty when applied to solar thermal power generation. The temperature of the working fluid circulated into the heater by classical supercritical CO2 is very high, about 400 ℃, compared with conventional H2The temperature of a working medium entering a heater through O steam Rankine cycle is only more than 200 ℃, a heat storage system is generally matched with solar thermal power generation, the high temperature entering the heater means that the heat release temperature interval of molten salt is reduced, the larger molten salt storage amount is needed when the heat with the same energy is stored, meanwhile, the power consumption of a molten salt pump is increased, the proportion of the cost in solar thermal power generation is higher, and therefore, the purpose of finding a proper cycle type which can take the heat efficiency and the temperature of the heat storage working medium into consideration is achieved, and the classic supercritical CO is set by parameters2The brayton cycle is difficult to achieve.
This problem can be solved by mixing the working substances. When it is to CO2With incorporation of other working substances, e.g. H2After O, the physical properties of the mixture are between those of the two, and the characteristics of the thermodynamic cycle are also both the two. Tong (Chinese character of 'tong')Through reasonable layout design, the reasonable temperature range of the molten salt can be ensured, and high thermal efficiency can be ensured.
But CO2The mixture also suffers from some problems. For example to CO2In which H is doped2The physical properties of the mixture can be well adjusted after O, but the physical properties of the two substances are greatly different, so that the mixture is easy to separate, and particularly, throttling or mutation parts such as a filter, a valve, a storage tank inlet and outlet and the like are generated in a system. Moreover, if the supercritical mixed state is to be maintained, the proportion requirement of the two substances is relatively accurate, and the system parameters are greatly limited, otherwise, the mixed state and the physical properties are influenced. This places a great limitation on the practical application of the mixture circulation.
If one system can realize that part of parts are in a mixture state and part of parts are in two single-phase working medium states, and the normal operation of important equipment such as a compressor, a pump and the like is ensured without the phenomena of cavitation, liquid impact and the like, the application range of the system can be greatly improved. The present invention has been made in order to solve the above problems.
Disclosure of Invention
In order to solve the problem that the temperature of a fused salt system is not matched when the supercritical Brayton cycle is applied to solar photo-thermal power generation, a mixture transcritical cycle solar photo-thermal power generation system is provided, and the thermal efficiency of the system is improved by adopting a method with relatively low technical difficulty and high feasibility.
In order to realize the purpose, the utility model discloses a technical scheme is:
a mixture transcritical cycle solar photo-thermal power generation system comprises a turbine 1, wherein a medium outlet of the turbine 1 is connected with a hot side inlet of a high-temperature heat regenerator 2, a hot side outlet of the high-temperature heat regenerator 2 is connected with a hot side inlet of a medium-temperature heat regenerator 3, a hot side outlet of the medium-temperature heat regenerator 3 is connected with an inlet of a gas-liquid separator 4, a bottom liquid discharge port of the gas-liquid separator 4 is connected with an inlet of a liquid pump 5, a top exhaust port of the gas-liquid separator 4 is connected with a hot side inlet of a low-temperature heat regenerator 6, a hot side outlet of the low-temperature heat regenerator 6 is connected with a hot side inlet of a precooler 7, a hot side outlet of the precooler 7 is connected with an inlet of a main compressor 8, an outlet of the main compressor 8 is connected with a cold side inlet of the low-temperature heat regenerator 6, and a cold side outlet of the low-temperature heat regenerator 6 is connected with a cold side inlet of the medium-temperature heat regenerator 3 after being converged with an outlet of the liquid pump 5;
the cold side outlet of the medium-temperature heat regenerator 3 is divided into two paths, one path is connected with the cold side inlet of the low-temperature molten salt heater 9, the other path is connected with the cold side inlet of the high-temperature heat regenerator 2, the cold side outlet of the high-temperature heat regenerator 2 is converged with the cold side outlet of the low-temperature molten salt heater 9 and then connected with the cold side inlet of the high-temperature molten salt heater 10, and the cold side outlet of the high-temperature molten salt heater 10 is connected with the medium inlet of the turbine 1.
The pressure in the gas-liquid separator 4 is between 7.2MPa and 7.6MPa, and the temperature is between 130 ℃ and 170 ℃. At this temperature and pressure, it is ensured that CO2 is in a supercritical state and has a density closer to that of a gas, while water is in a liquid.
The ratio of the diameter of the tank body of the gas-liquid separator 4 to the pipe diameter of the inlet pipeline is more than 10, and the ratio of the effective volume height of the tank body to the diameter of the tank body is more than 1. The flow area under the size proportion is obviously expanded, and the gas-liquid separation is more facilitated.
An operation method of a mixture transcritical circulation solar photo-thermal power generation system comprises the following steps;
the supercritical mixed working medium in the mixed state applies work in the turbine 1, the working medium after applying work is still in the supercritical mixed state, the mixture sequentially enters the hot sides of the high-temperature heat regenerator 2 and the medium-temperature heat regenerator 3 to release heat, and CO reduces the temperature2And H2O is separated in a gas-liquid separator 4, H2O becomes liquid and is discharged from the bottom of the gas-liquid separator 4, and then enters the liquid pump 5 to be pressurized, and CO becomes liquid2Keeping the gas state discharged from the top of the gas-liquid separator 4, sequentially entering the low-temperature heat regenerator 6 and the hot side of the precooler 7 to continuously release heat, then entering the main compressor 8 to be pressurized, and pressurizing CO2Enters the cold side of the low-temperature regenerator 6 to absorb heat and then is connected with the high pressure H at the outlet of the liquid pump 52The O is converged and enters the cold side of the intermediate temperature heat regenerator 3 to absorb heat, and then CO is absorbed2And H2O becomes supercritical againAnd in the state, the supercritical mixture is divided into two paths at the cold side outlet of the medium-temperature heat regenerator 3, one path enters the cold side of the low-temperature molten salt heater 9 to absorb heat, the other path enters the cold side of the high-temperature heat regenerator 2 to absorb heat, the working medium at the cold side outlet of the high-temperature heat regenerator 2 is converged with the working medium at the cold side outlet of the low-temperature molten salt heater 9 and then enters the high-temperature molten salt heater 10 to be continuously heated to high temperature, and then enters the turbine 1 again to do work, so that the whole cycle is completed.
The utility model has the advantages that:
the utility model discloses in adopt H2O and C2The mixture of O is used as working medium, the working medium is in supercritical mixing state at high-temperature position, and part of H is at low-temperature position2O and CO2Separation of CO2Compression and pressure increase by compressor, H2And O is pressurized by a water pump. The system has higher heat efficiency than the traditional steam circulation efficiency, and simultaneously, the fused salt heat release interval is more than the classical supercritical CO2The Brayton cycle has a large heat release interval and small molten salt demand. Meanwhile, the phenomena of liquid carrying in the gas compression process and vaporization in the liquid compression process are avoided. The safety and stability of the equipment are improved.
Drawings
Fig. 1 is a schematic structural diagram of the system of the present invention.
The system comprises a turbine 1, a high-temperature heat regenerator 2, a medium-temperature heat regenerator 3, a gas-liquid separator 4, a liquid pump 5, a low-temperature heat regenerator 6, a precooler 7, a main compressor 8, a low-temperature molten salt heater 9 and a high-temperature molten salt heater 10.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a critical circulation solar photothermal power system is striden to mixture, including turbine 1, high temperature regenerator 2, medium temperature regenerator 3, vapour and liquid separator 4, liquid pump 5, low temperature regenerator 6, precooler 7, main compressor 8, low temperature molten salt heater 9, high temperature molten salt heater 10 that communicate in proper order.
The outlet of the turbine 1 is connected with the hot side inlet of the high-temperature heat regenerator 2, the hot side outlet of the high-temperature heat regenerator 2 is connected with the hot side inlet of the medium-temperature heat regenerator 3, the hot side outlet of the medium-temperature heat regenerator 3 is connected with the inlet of the gas-liquid separator 4, the bottom liquid outlet of the gas-liquid separator 4 is connected with the inlet of the liquid pump 5, the top exhaust port of the gas-liquid separator 4 is connected with the hot side inlet of the low-temperature heat regenerator 6, the hot side outlet of the low-temperature heat regenerator 6 is connected with the hot side inlet of the precooler 7, the hot side outlet of the precooler 7 is connected with the inlet of the main compressor 8, the outlet of the main compressor 8 is connected with the cold side inlet of the low-temperature heat regenerator 6, the cold side outlet of the low-temperature heat regenerator 6 is connected with the cold side inlet of the medium-temperature heat regenerator 3 after being converged with the outlet of the liquid pump 5, the cold side outlet of the medium-temperature heat regenerator 3 is divided into two paths, one path is connected with the cold side inlet of the low-temperature molten salt heater 9, the other path is connected with a cold side inlet of the high-temperature heat regenerator 2, a cold side outlet of the high-temperature heat regenerator 2 is connected with a cold side inlet of the high-temperature molten salt heater 10 after being converged with a cold side outlet of the low-temperature molten salt heater 9, and a cold side outlet of the high-temperature molten salt heater 10 is connected with an inlet of the turbine 1.
The utility model discloses the concrete working process of system does:
the supercritical mixed working medium in the mixed state applies work in the turbine 1, the working medium after applying work is still in the supercritical mixed state, the mixture sequentially enters the hot sides of the high-temperature heat regenerator 2 and the medium-temperature heat regenerator 3 to release heat, and CO reduces the temperature2And H2O is separated in a gas-liquid separator 4, H2O is changed into liquid and is discharged from the bottom of the gas-liquid separator 4, then enters the liquid pump 5 to be pressurized, CO2 keeps gaseous state and is discharged from the top of the gas-liquid separator 4, enters the low-temperature heat regenerator 6 and the hot side of the precooler 7 to continuously release heat, then enters the main compressor 8 to be pressurized, and the pressurized CO is pressurized2Enters the cold side of the low-temperature regenerator 6 to absorb heat and then is connected with the high pressure H at the outlet of the liquid pump 52The O is converged and enters the cold side of the intermediate temperature heat regenerator 3 to absorb heat, and then CO is absorbed2And H2O is changed into a supercritical mixed state again, the supercritical mixture is divided into two paths at the cold side outlet of the medium temperature heat regenerator 3, one path enters the cold side of the low-temperature fused salt heater 9 to absorb heat, the other path enters the cold side of the high-temperature heat regenerator 2 to absorb heat, the working medium at the cold side outlet of the high-temperature heat regenerator 2 is converged with the working medium at the cold side outlet of the low-temperature fused salt heater 9 and then enters the high-temperature fused salt to be addedThe heater 10 continues to be heated to a high temperature before it enters the turbine 1 again to do work, completing the entire cycle.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A mixture transcritical cycle solar photo-thermal power generation system is characterized by comprising a turbine (1), wherein a medium outlet of the turbine (1) is connected with a hot side inlet of a high-temperature regenerator (2), a hot side outlet of the high-temperature regenerator (2) is connected with a hot side inlet of a medium-temperature regenerator (3), a hot side outlet of the medium-temperature regenerator (3) is connected with an inlet of a gas-liquid separator (4), a bottom liquid discharge port of the gas-liquid separator (4) is connected with an inlet of a liquid pump (5), a top exhaust port of the gas-liquid separator (4) is connected with a hot side inlet of a low-temperature regenerator (6), a hot side outlet of the low-temperature regenerator (6) is connected with a hot side inlet of a precooler (7), a hot side outlet of the precooler (7) is connected with an inlet of a main compressor (8), and an outlet of the main compressor (8) is connected with a cold side inlet of the low-temperature regenerator (6), a cold side outlet of the low-temperature regenerator (6) is converged with an outlet of the liquid pump (5) and then is connected with a cold side inlet of the medium-temperature regenerator (3);
the cold side outlet of the medium-temperature heat regenerator (3) is divided into two paths, one path is connected with the cold side inlet of the low-temperature molten salt heater (9), the other path is connected with the cold side inlet of the high-temperature heat regenerator (2), the cold side outlet of the high-temperature heat regenerator (2) is converged with the cold side outlet of the low-temperature molten salt heater (9) and then connected with the cold side inlet of the high-temperature molten salt heater (10), and the cold side outlet of the high-temperature molten salt heater (10) is connected with the medium inlet of the turbine (1).
2. The solar energy photo-thermal power generation system with mixture transcritical circulation as claimed in claim 1, characterized in that the pressure in said gas-liquid separator (4) is between 7.2MPa and 7.6MPa and the temperature is between 130 ℃ and 170 ℃.
3. The mixture transcritical circulation solar photo-thermal power generation system according to claim 1, wherein the ratio of the tank diameter of the gas-liquid separator (4) to the pipe diameter of the inlet pipeline is greater than 10, and the ratio of the effective volume height of the tank to the tank diameter is greater than 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112832907A (en) * | 2021-03-31 | 2021-05-25 | 西安热工研究院有限公司 | Mixture transcritical circulation solar photo-thermal power generation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112832907A (en) * | 2021-03-31 | 2021-05-25 | 西安热工研究院有限公司 | Mixture transcritical circulation solar photo-thermal power generation system and method |
| CN112832907B (en) * | 2021-03-31 | 2023-08-11 | 西安热工研究院有限公司 | Mixture transcritical cycle solar photo-thermal power generation system and method |
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