CN215176096U - Solar photovoltaic photo-thermal hybrid power generation system - Google Patents

Solar photovoltaic photo-thermal hybrid power generation system Download PDF

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Publication number
CN215176096U
CN215176096U CN202120726996.XU CN202120726996U CN215176096U CN 215176096 U CN215176096 U CN 215176096U CN 202120726996 U CN202120726996 U CN 202120726996U CN 215176096 U CN215176096 U CN 215176096U
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power generation
heat
generation system
temperature
storage tank
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CN202120726996.XU
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Chinese (zh)
Inventor
杨天锋
梁鹏锋
杨上锋
林诚乾
杨佳丽
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Hangzhou Mingsheng New Energy Technology Co ltd
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Hangzhou Mingsheng New Energy Technology Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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Abstract

The utility model relates to a solar photovoltaic photo-thermal hybrid power generation system, which comprises a solar heat collector, a heat pump, a high-temperature storage tank, a low-temperature storage tank, a steam generator, a steam turbine power generation system and a photovoltaic power generation system, wherein a heat transfer medium flows into the heat pump after being heated by the solar heat collector, the heat of the heat transfer medium is transferred to a heat storage medium discharged from the low-temperature storage tank under the action of the heat pump, and the heated high-temperature heat storage medium enters the high-temperature storage tank for storage; the heat storage medium from the high-temperature storage tank enters the steam generator, the water working medium is heated to generate high-temperature steam, and the high-temperature steam enters the steam turbine power generation system to do work and generate power; the electric energy required by the heat pump comes from the photovoltaic power generation system.

Description

Solar photovoltaic photo-thermal hybrid power generation system
Technical Field
The utility model relates to a solar energy power generation utilizes, especially relates to a solar photovoltaic optothermal hybrid power generation system.
Background
With the huge consumption of traditional fossil energy, people are confronted with 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. Renewable energy has been the strategic high point of new generation energy technologies. 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.
With the gradual improvement of energy safety and carbon emission reduction requirements in China, the continuous increase of clean and low-carbon photovoltaic and wind power generation machines, and the power system enters the era of high-proportion renewable energy grid connection. The strong fluctuation and randomness of the output of high-proportion photovoltaic and wind power can put higher requirements on the flexibility of a power system, and the problems of low inertia, safety, stability and the like of the system are brought by grid connection of power electronic devices, so that large-scale consumption of new energy becomes a difficult point which needs to be broken through urgently.
The principle of solar thermal power generation is that an absorber is utilized to convert focused sunlight into high-temperature heat energy which is used as a heat source of power circulation to generate mechanical energy to drive a generator set to generate power. The solar thermal power generation technology integrates power generation and high-capacity energy storage, and is a renewable energy source with flexible regulation capacity. The wind power photovoltaic grid-connected system can play roles in peak regulation, frequency modulation, standby and the like under high-proportion wind power photovoltaic grid-connected. In the future, photo-thermal power generation is used as an important clean and flexible adjusting power supply of a power system and becomes an important component of a high-proportion renewable energy base. With the great increase of the utilization ratio of renewable energy sources, solar thermal power generation can be used as a base load and a peak shaving power supply, and has an important effect on improving the consumption capacity of a power grid on unstable renewable energy sources such as photovoltaic energy, wind power energy and the like.
The solar thermal power generation mode is a point light condensation mode and a line light condensation mode. The point light-focusing solar heat collector mainly comprises a tower type and a disc type, and is characterized by high light-focusing ratio, high heat-collecting temperature and high cost. The linear condensation solar heat collector has the advantages of being groove-type, linear Fresnel-type and the like, and is mainly characterized by relatively low condensation ratio and heat collection temperature and low cost. Solar thermal power generation can improve the power generation time and efficiency through low-cost heat storage, and has good power output stability and schedulability.
Solar thermal power generation technology is more in variety, gradually matures at present, and enters a commercialization stage, but the cost is still higher, the competitiveness is not strong, and technical innovation is urgently needed to improve the efficiency and reduce the cost. The higher the working temperature of the solar thermal power generation, the higher the efficiency. Taking a steam Rankine cycle as an example, the steam parameter of a steam turbine is increased from 530 ℃ to 550 ℃, the heat consumption of the steam turbine is reduced by 1%, and the generating capacity of a 100 megawatt unit can be increased by nearly 400 ten thousand kilowatt hours all the year round; when the steam parameter reaches 620 ℃, the power generation efficiency can reach 48 percent, which is greatly higher than the Rankine cycle efficiency (-40 percent) in the prior solar thermal power station.
In summary, the main problems faced by the current solar power generation technology are: the photovoltaic power generation cost is low, but the fluctuation is high, the power grid consumption becomes the bottleneck of further development of the photovoltaic power generation, and if a battery is equipped for energy storage, the cost is high, and the profit is difficult; the solar thermal power generation output is stable, but the manufacturing cost is high, and the working temperature needs to be increased for further improving the power generation efficiency.
Disclosure of Invention
The utility model discloses the problem that solar energy power generation faces more than the needle provides a solar photovoltaic light and heat hybrid power generation system, utilizes the surplus electrical heating heat-retaining medium temperature that photovoltaic power generation system can not be absorbed by the electric wire netting. On one hand, the heat storage temperature and the power generation efficiency of the heat storage medium are improved, on the other hand, the 'electricity abandon' generated by the photovoltaic power generation system is stored, and the heat and power conversion output is performed according to the needs of a power grid. The specific scheme of the invention is as follows:
a solar photovoltaic photo-thermal hybrid power generation system is characterized by comprising a solar heat collector, a heat pump, a high-temperature storage tank, a low-temperature storage tank, a steam generator and a steam turbine power generation system, wherein the solar heat collector is connected with the low-temperature heat source side of the heat pump, namely, an outlet of the solar heat collector is connected with an inlet of the low-temperature heat source side of the heat pump, and an outlet of the low-temperature heat source side of the heat pump is connected with an inlet of the solar heat collector; the outlet of the low-temperature storage tank is connected with the inlet of the high-temperature heat source side of the heat pump, and the outlet of the high-temperature heat source side of the heat pump is connected with the inlet of the high-temperature storage tank; the outlet of the high-temperature storage tank is connected with the inlet of the hot side of the steam generator, and the outlet of the hot side of the steam generator is connected with the inlet of the low-temperature storage tank; and a water working medium outlet of the steam turbine power generation system is connected with a cold side inlet of the steam generator, and a cold side outlet of the steam generator is connected with a water working medium inlet of the steam turbine power generation system.
The heat transfer medium is heated in the solar heat collector and enters the heat pump to provide heat as a low-temperature heat source; and the heat storage medium from the low-temperature storage tank enters the high-temperature heat source side of the heat pump to be heated, and then enters the high-temperature storage tank. The heat of the heat transfer medium with lower temperature is transferred to the heat storage medium with higher temperature under the action of the heat pump, the working temperature of the steam generator is improved, the system efficiency is improved, and meanwhile, the electric energy consumed by the heat pump is stored in the form of heat energy. The steam generator heats the water working medium from the steam turbine power generation system to generate high-temperature steam, and then the high-temperature steam enters the steam turbine power generation system to do work and generate power.
Further, the utility model discloses still include electric heater, the high temperature heat source side exit linkage of heat pump electric heater import, electric heater exit linkage high temperature storage tank import. The electric heater is used for further heating the heat storage medium, so that the temperature of the heat storage medium is increased, and electric energy is stored in the form of heat energy.
Further, the utility model discloses still include photovoltaic power generation system, electric heater and the electric energy of heat pump consumption comes from photovoltaic power generation system, is used for heating heat-retaining medium with the surplus electricity that photovoltaic power generation system can not be absorbed by the electric wire netting, improves heat-retaining medium temperature, stores this part electric energy with the form of heat energy simultaneously.
Preferably, the solar heat collector comprises a tower type, a disc type, a groove type and a linear Fresnel type. The heat transfer medium is any one of heat transfer oil, molten salt, water working medium, air and liquid metal, and the heat storage medium is any one of molten salt and solid particles.
The utility model discloses utilize solar collector heating heat transfer medium, as the low temperature heat source heating high temperature heat-retaining medium of heat pump, further heat high temperature heat-retaining medium through electric heater simultaneously. The electric energy required by the heat pump and the electric heater is provided by a photovoltaic power generation system. The utility model discloses an aspect improves heat-retaining medium temperature, improves the operating temperature of follow-up steam turbine power generation system, and then improves the generating efficiency; on the other hand, the redundant electric quantity which cannot be absorbed by the power grid of the photovoltaic power generation system is stored in the form of heat energy, and electric energy is output outwards through the steam turbine power generation system in cloudy days or at night according to the power grid requirement.
The heat pump in the utility model is a device which transfers the heat of a low-temperature heat source to a high-temperature heat source by using electric energy, for example, the temperature of a heat transfer medium coming out of a solar heat collector is 400 ℃, the heat of the heat transfer medium can be transferred to a high-temperature heat storage medium under the action of the heat pump, and the temperature of the high-temperature heat storage medium heated by the heat pump can reach more than 500 ℃; the steam generator is a device for heating, evaporating and superheating liquid water by using a high-temperature heat source, and generally comprises a preheater, an evaporator, a steam drum, a superheater, a reheater and the like; the steam turbine power generation system is a system for generating power by applying work by using high-temperature and high-pressure steam, and mainly comprises a steam turbine, a condenser, a steam extraction heat regenerator, a water feeding pump and the like.
Drawings
FIG. 1 is a schematic view of specific example 1;
FIG. 2 is a schematic view of embodiment 2;
in the figure: 1-a solar heat collector; 2-a heat pump; 3-high temperature storage tank; 4-a low-temperature storage tank; 5-a steam generator; 6-a steam turbine power generation system; 7-a photovoltaic power generation system; 8-electric heater.
Detailed Description
Example 1
The utility model provides a solar photovoltaic light and heat hybrid power generation system, as shown in fig. 1, including solar collector 1, heat pump 2, high temperature storage tank 3, low temperature storage tank 4, steam generator 5, steam turbine power generation system 6, photovoltaic power generation system 7. An outlet of the solar heat collector 1 is connected with a low-temperature heat source side inlet of the heat pump 2, and a low-temperature heat source side outlet of the heat pump 2 is connected with an inlet of the solar heat collector 1. The outlet of the low-temperature storage tank 4 is connected with the inlet of the high-temperature heat source side of the heat pump 2. The high-temperature heat source side outlet of the heat pump 2 is connected with the inlet of the high-temperature storage tank 3, the outlet of the high-temperature storage tank 3 is connected with the hot side inlet of the steam generator 5, and the hot side outlet of the steam generator 5 is connected with the inlet of the low-temperature storage tank 4. The water working medium outlet of the steam turbine power generation system 6 is connected with the cold side inlet of the steam generator 5, and the cold side outlet of the steam generator 5 is connected with the water working medium inlet of the steam turbine power generation system 6.
The heat transfer medium is heated to about 400 ℃ in the solar heat collector 1, enters the heat pump 2 to be used as a low-temperature heat source for providing heat, and is used for heating the heat storage medium out of the low-temperature storage tank 4 to 500-600 ℃. The heat storage medium heated by the heat pump 2 enters the high-temperature storage tank 3 for storage. According to the power generation requirement, the high-temperature heat storage medium stored in the high-temperature storage tank 3 is utilized to heat the water working medium in the steam generator 5 to form high-temperature high-pressure steam, and the high-temperature high-pressure steam is used for generating power by the steam turbine power generation system 6. Through the action of the heat pump 2, the heat of the heat transfer medium with lower temperature is transferred to the heat storage medium with higher temperature, so that the working temperature of the steam generator 5 is increased, the efficiency of the steam turbine power generation system 6 is improved, and meanwhile, the electric energy consumed by the heat pump 2 is stored in the form of heat energy. Part of the electric quantity generated by the photovoltaic power generation system 7 and the electric quantity generated by the steam turbine power generation system 6 output electric energy together; the other part of the generated energy of the photovoltaic system is used for the heat pump 2, namely the electric energy consumed by the heat pump 2 is derived from the electric energy generated by the photovoltaic power generation system 7. By the aid of the heat pump system, part of electric quantity which cannot be consumed by a photovoltaic power grid can be used for the heat pump 2, and the electric quantity is converted into high-temperature heat energy to be stored.
Example 2
As shown in fig. 2, in addition to embodiment 1, an electric heater 8 is added, an inlet of the electric heater 8 is connected to an outlet of the heat pump 2 on the high-temperature heat source side, and an outlet of the electric heater 8 is connected to an inlet of the high-temperature storage tank 3. The heat storage medium is heated by the heat pump 2 and then heated by the electric heater 8, so that the temperature of the heat storage medium can be further increased. The electric heater directly converts electric energy into heat energy through the resistor and stores the heat energy in the heat storage medium, and the electric heater is simple and reliable in structure and high in heating temperature.
The above embodiments 1-2 are only some embodiments of the present invention, and it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these embodiments. The technical solutions of the present invention, which can be modified or substituted equally to the related technical features by those skilled in the art, will fall within the protection scope of the present invention without departing from the principle of the present invention. Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims (7)

1. A solar photovoltaic photo-thermal hybrid power generation system is characterized by comprising a solar heat collector, a heat pump, a high-temperature storage tank, a low-temperature storage tank, a steam generator and a steam turbine power generation system, wherein the solar heat collector is connected with the low-temperature heat source side of the heat pump, namely, an outlet of the solar heat collector is connected with an inlet of the low-temperature heat source side of the heat pump, and an outlet of the low-temperature heat source side of the heat pump is connected with an inlet of the solar heat collector; the outlet of the low-temperature storage tank is connected with the inlet of the high-temperature heat source side of the heat pump, and the outlet of the high-temperature heat source side of the heat pump is connected with the inlet of the high-temperature storage tank; the outlet of the high-temperature storage tank is connected with the inlet of the hot side of the steam generator, and the outlet of the hot side of the steam generator is connected with the inlet of the low-temperature storage tank; and a water working medium outlet of the steam turbine power generation system is connected with a cold side inlet of the steam generator, and a cold side outlet of the steam generator is connected with a water working medium inlet of the steam turbine power generation system.
2. The solar photovoltaic-photothermal hybrid power generation system according to claim 1, wherein a heat transfer medium is heated in said solar heat collector, and enters said heat pump to provide heat as a low temperature heat source; the heat storage medium from the low-temperature storage tank enters the high-temperature heat source side of the heat pump to be heated, and then enters the high-temperature storage tank; the steam generator heats the water working medium from the steam turbine power generation system to generate high-temperature steam, and then the high-temperature steam enters the steam turbine power generation system to do work and generate power.
3. The solar photovoltaic and photo-thermal hybrid power generation system according to claim 1, further comprising an electric heater, wherein the outlet on the high-temperature heat source side of the heat pump is connected to the inlet of the electric heater, and the outlet of the electric heater is connected to the inlet of the high-temperature storage tank.
4. The solar photovoltaic and photo-thermal hybrid power generation system according to claim 1, further comprising a photovoltaic power generation system, wherein the electric energy required by the heat pump comes from the photovoltaic power generation system.
5. The solar photovoltaic and photo-thermal hybrid power generation system according to claim 3, further comprising a photovoltaic power generation system, wherein the electric energy required by the heat pump and the electric heater comes from the photovoltaic power generation system.
6. The solar photovoltaic photo-thermal hybrid power generation system according to any one of claims 1, 2, 3, 4 or 5, wherein the solar thermal collector comprises a tower type, a dish type, a trough type, a linear Fresnel type.
7. The solar photovoltaic photo-thermal hybrid power generation system according to claim 2, wherein the heat transfer medium is any one of heat transfer oil, molten salt, water working medium, air and liquid metal, and the heat storage medium is any one of molten salt and solid particles.
CN202120726996.XU 2021-04-11 2021-04-11 Solar photovoltaic photo-thermal hybrid power generation system Expired - Fee Related CN215176096U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115200076A (en) * 2022-07-07 2022-10-18 陕西煤业新型能源科技股份有限公司 Solar energy light-electricity-heat coupling energy and domestic water self-supply system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115200076A (en) * 2022-07-07 2022-10-18 陕西煤业新型能源科技股份有限公司 Solar energy light-electricity-heat coupling energy and domestic water self-supply system
CN115200076B (en) * 2022-07-07 2024-04-30 陕西煤业新型能源科技股份有限公司 Solar photo-electric-thermal coupling energy and domestic water self-supply system

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Granted publication date: 20211214