Photo-thermal power generation system
By introducing auxiliary heating boilers into the photothermal power generation system to perform secondary heating of steam, the problem of low power generation efficiency caused by low steam temperature in the existing photothermal power generation system is solved, and more efficient power generation effect is achieved, and the power generation capacity is maintained in poor weather.
Patent Information
- Application Number
- CN202422181184.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-05
AI Technical Summary
Among the existing photothermal power generation systems, the steam temperature of the trough-type and linear Fresnel photothermal power generation systems is low, resulting in low power generation efficiency.
By introducing an auxiliary heating boiler into the photothermal power generation system, the steam output from the heat exchange unit is reheated, the steam temperature is increased, and the electric heating boiler or biomass boiler is relied on for heating in poor weather conditions.
Increases steam temperature, thereby increasing power generation efficiency, reducing costs, and maintaining efficient power generation capacity in poor weather.
Smart Images
Figure CN223004946U_ABST
Abstract
Description
Technical Field
[0001] This specification relates to the technical field of power generation, and particularly to a solar thermal power generation system. Background Art
[0002] Solar thermal power generation can convert solar energy into heat energy and then into electrical energy. For example, a solar thermal power generation system can use a large-scale array of parabolic trough mirrors or plane mirrors to collect solar heat energy, heat water into steam through a heat exchange device, and use the steam to drive a steam turbine to drive a generator to generate electricity. In the prior art, the steam temperature of trough type and linear Fresnel type solar thermal power generation systems is relatively low, resulting in low power generation efficiency. Summary of the Utility Model
[0003] An embodiment of this specification provides a solar thermal power generation system for increasing the steam temperature, thereby improving the power generation efficiency.
[0004] An embodiment of this specification provides a solar thermal power generation system, which includes a heat collection unit, a heat exchange unit, and a power generation unit; the heat collection unit includes a heat collection component; the power generation unit includes an auxiliary heating boiler and a power generation component connected to each other; the heat collection component is connected to the heat exchange unit, and the heat exchange unit is connected to the auxiliary heating boiler;
[0005] The heat collection component is used to heat heat transfer oil by using solar energy;
[0006] The heat exchange unit is used to heat water into steam by using the heat transfer oil output by the heat collection component;
[0007] The auxiliary heating boiler is used to heat the steam output by the heat exchange unit;
[0008] The power generation component is used to generate electricity by using the steam output by the auxiliary heating boiler.
[0009] The solar thermal power generation system of the embodiment of this specification can increase the steam temperature by using an auxiliary heating boiler to perform secondary heating on the steam output by the heat exchange unit, thereby improving the power generation efficiency and having a relatively low cost. In addition, the auxiliary heating boiler does not depend on solar energy and is not affected by weather conditions, and can achieve high-efficiency power generation under bad weather conditions. Description of the Drawings
[0010] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are only some embodiments recorded in this specification. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0011] Figure 1 It is a schematic functional structure diagram of the solar thermal power generation system in the embodiment of this specification;
[0012] Figure 2 It is a schematic functional structure diagram of the solar thermal power generation system in the first operating mode in the embodiment of this specification;
[0013] Figure 3 It is a schematic functional structure diagram of the solar thermal power generation system in the second operating mode in the embodiment of this specification;
[0014] Figure 4 It is a schematic functional structure diagram of the solar thermal power generation system in the third operating mode in the embodiment of this specification;
[0015] Figure 5 It is a schematic functional structure diagram of the solar thermal power generation system in the fifth operating mode in the embodiment of this specification;
[0016] Figure 6 It is a schematic functional structure diagram of the solar thermal power generation system in the seventh operating mode in the embodiment of this specification.
[0017]
Explanation of the reference numerals
[0018] 1, heat collection unit; 2, power generation unit; 11, heat collection component; 12, heat exchange unit; 121, preheater; 122, evaporator; 123, superheater; 21, auxiliary heating boiler; 22, power generation component; 221, steam turbine; 222, generator; 13, first oil pump; 14, second oil pump; 23, water pump; 223, condenser; 3, energy storage unit; 31, first salt tank; 32, heat exchange component; 33, second salt tank; 34, first salt pump; 35, second salt pump; 4, electric heating unit; 5, switching valve. Detailed implementation manners
[0019] Next, the technical solutions in the embodiments of this specification will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, rather than all the embodiments. The specific embodiments described herein are only used to explain the present disclosure, rather than limiting the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present disclosure. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.
[0020] Please refer to Figure 1 . An embodiment of this specification provides a solar thermal power generation system.
[0021] The solar thermal power generation system may include a trough solar thermal power generation system.
[0022] In some embodiments, the solar thermal power generation system may include a heat collection unit 1, a heat exchange unit 12, and a power generation unit 2. The heat collection unit 1 is used to collect solar thermal energy. The heat exchange unit 12 is used to heat water into steam. The power generation unit 2 is used to generate electricity using steam.
[0023] The heat collection unit 1 may include a heat collection component 11. The heat collection component 11 may include a collector. For example, the heat collection component 11 may be a trough collector, and the trough collector may include a trough mirror array, and the trough mirror array may include a plurality of serially and / or parallely connected trough mirrors. The heat collection component 11 is used to heat heat transfer oil using solar energy. The heat exchange unit 12 may include a preheater 121, an evaporator 122, a superheater 123, etc. connected in sequence. The heat exchange unit 12 is used for heat exchange between heat transfer oil and water. The heat exchange unit 12 may heat water into steam using the heat transfer oil output by the heat collection component 11.
[0024] The power generation unit 2 may include an auxiliary heating boiler 21 and a power generation component 22 connected to each other. The auxiliary heating boiler 21 is used to heat the steam output by the heat exchange unit 12. By using the auxiliary heating boiler 21 to perform secondary heating on the steam output by the heat exchange unit 12, the steam temperature can be increased, thereby improving the power generation efficiency and with relatively low cost. For example, by using the auxiliary heating boiler 21 to perform secondary heating on the steam output by the heat exchange unit 12, the steam parameters can break through the upper limit of (about) 390°C and be further increased to 500°C or even higher. The steam with higher parameters significantly improves the power generation efficiency. In addition, the auxiliary heating boiler 21 does not rely on solar energy and is not affected by weather conditions, and can achieve efficient power generation in case of bad weather conditions (such as rainy days). Optionally, the auxiliary heating boiler 21 may include an electric heating boiler and a biomass boiler, etc. The electric heating boiler can heat the steam using electric energy. The biomass boiler can heat the steam using biomass energy, and the biomass energy may include crop wastes, forestry wastes, etc. In practice, the corresponding auxiliary heating boiler 21 can be selected in combination with the resource situation. The power generation component 22 is used to generate electricity using the steam output by the auxiliary heating boiler 21. The power generation component 22 may include a steam turbine 221, a generator 222, and a condenser 223. The steam turbine 221 can drive the blades to rotate using steam, thereby converting the thermal energy of the steam into kinetic energy. The generator 222 can generate electricity driven by the steam turbine 221, thereby converting kinetic energy into electrical energy.
[0025] In some embodiments, the heat collection unit 1 may further include a first oil pump 13. The first oil pump 13 may be respectively connected to the heat collection component 11 and the heat exchange unit 12. The first oil pump 13 is configured to pump the heat-conducting oil output by the heat exchange unit 12 into the heat collection component 11, so that the heat collection component 11 heats the heat-conducting oil output by the heat exchange unit 12.
[0026] Thus, after the heat exchange unit 12 transfers the heat of the heated heat-conducting oil to water, it can output the cooled heat-conducting oil. The cooled heat-conducting oil can be pumped into the heat collection component 11 by the first oil pump 13 for heating to obtain the heated heat-conducting oil. The heat exchange unit 12 can transfer the heat of the heated heat-conducting oil to water. Thus, the recycling of the heat-conducting oil is realized.
[0027] In some embodiments, the power generation unit may further include a water pump 23. The water pump 23 may be respectively connected to the heat exchange unit 12 and the power generation component 22. The water pump 23 is configured to pump the water output by the power generation component 22 into the heat exchange unit 12, so that the heat exchange unit 12 heats the water output by the power generation component 22 into steam.
[0028] Thus, after the power generation component 22 generates electricity using steam, it can output the cooled water. The cooled water can be pumped into the heat exchange unit 12 by the water pump 23 for heating. The auxiliary heating boiler 21 can heat the steam output by the heat exchange unit 12 again. The power generation component 22 can generate electricity using the secondary-heated steam. Thus, the recycling of water is realized.
[0029] In some embodiments, the power generation component 22 may further include a condenser 223. The condenser 223 may be respectively connected to the steam turbine 221 and the water pump 23. The steam can be cooled to water after passing through the power generation component 22. Specifically, the steam turbine 221 can output low-temperature steam. The condenser 223 is configured to cool the low-temperature steam output by the steam turbine 221 to water, so as to facilitate the water pump 23 to pump water into the heat exchange unit 12.
[0030] In some embodiments, the solar thermal power generation system may further include an energy storage unit 3. The energy storage unit 3 may include a first salt tank 31, a heat exchange component 32, and a second salt tank 33 that are connected in sequence. The first salt tank 31 is used to store molten salt. For example, the first salt tank 31 may be a hot salt tank for storing hot molten salt. The heat exchange component 32 is used for heat exchange between the molten salt and the heat-conducting oil. The second salt tank 33 is used to store molten salt. For example, the second salt tank 33 may be a cold salt tank for storing cold molten salt.
[0031] The heat collection unit 1 may further include a second oil pump 14. The second oil pump 14 is connected to the heat exchange component 32. The second oil pump 14 can pump the heat-conducting oil into the heat exchange component 32.
[0032] In some embodiments, the heat exchange component 32 is configured to heat the molten salt in the second salt tank 33 by using the heat-conducting oil output by the heat collection component 11. The heated molten salt can be stored in the first salt tank 31. Thus, heat can be stored by heating the molten salt.
[0033] Optionally, the energy storage unit 3 may further include a second salt pump 35. The second salt pump 35 can be respectively connected to the second salt tank 33 and the heat exchange component 32. The second salt pump 35 is configured to pump the molten salt in the second salt tank 33 into the heat exchange component 32, so that the heat exchange component 32 heats the molten salt in the second salt tank 33.
[0034] In some embodiments, the heat exchange component 32 is configured to heat the heat-conducting oil by using the molten salt in the first salt tank 31. The cooled molten salt can be stored in the second salt tank 33. The heat exchange unit 12 is further configured to heat water into steam by using the heat-conducting oil output by the heat exchange component 32. The auxiliary heating boiler 21 can further heat the steam output by the heat exchange unit 12. The power generation component 22 can generate electricity by using the steam after secondary heating. Thus, power generation by using energy storage is achieved.
[0035] Optionally, the energy storage unit 3 may further include a first salt pump 34. The first salt pump 34 can be respectively connected to the first salt tank 31 and the heat exchange component 32. The first salt pump 34 is configured to pump the molten salt in the first salt tank 31 into the heat exchange component 32, so that the heat exchange component 32 heats the heat-conducting oil by using the molten salt in the first salt tank 31.
[0036] In some embodiments, the solar thermal power generation system may further include an electric heating unit 4. The electric heating unit 4 may include an electric heater. The electric heating unit 4 can be respectively connected to the first salt tank 31 and the second salt tank 33. The electric heating unit 4 is configured to heat the molten salt in the second salt tank 33 by using electric energy. The heated molten salt can be stored in the first salt tank 31.
[0037] Optionally, the second salt pump 35 may further be connected to the electric heating unit 4. The second salt pump 35 is configured to pump the molten salt in the second salt tank 33 into the electric heating unit 4, so that the electric heating unit 4 heats the molten salt in the second salt tank 33.
[0038] Increasing heat storage through the electric heating unit 4 can extend the power generation duration of the solar thermal power generation system, increase the power generation capacity of the solar thermal power generation system, and enhance the long-term stable power generation ability of the solar thermal power generation system. The electric heating unit 4 can operate based on low-cost recycled electric energy or abandoned wind and solar power, so that molten salt can be heated by the electric heating unit 4 during periods of low electricity prices or abandoned power, thereby improving the economy of the solar thermal power generation system. Additionally, through the electric heating unit 4, continuous power generation can also be achieved under poor weather conditions (such as rainy or cloudy days), enhancing the flexibility of the solar thermal power generation system.
[0039] The above-mentioned heat transfer oil can include mineral oil, vegetable oil, synthetic oil, and so on.
[0040] The connection in the above-mentioned embodiments can be, for example, through pipelines.
[0041] In the above-mentioned embodiments, the heat collection unit 1, the power generation unit 2, the heat storage unit 3, and the electric heating unit 4 can all include on-off valves. For example, the power generation unit 2 can include an on-off valve 5. The on-off valve is used to control the connection and disconnection of the pipeline.
[0042] The following introduces the operation mode of the above-mentioned solar thermal power generation system in the embodiments of this specification.
[0043] In some embodiments, the above-mentioned solar thermal power generation system can be in the first operation mode. The first operation mode can be the heat collection and power generation mode. In the heat collection and power generation mode, the heat collection unit 1 is used for power generation. In scenarios where it is not sufficient to store heat while generating power, the above-mentioned solar thermal power generation system can be in the first operation mode.
[0044] Please refer to Figure 2 . The first oil pump 13 is started. The heat transfer oil enters the heat collection component 11 to be heated, obtaining heated high-temperature heat transfer oil. The high-temperature heat transfer oil sequentially passes through the superheater 123, the evaporator 122, and the preheater 121 in the heat exchange unit 12, thereby heating water into high-temperature and high-pressure steam. The cooled heat transfer oil enters the heat collection component 11 again to be heated to form a cycle.
[0045] The water pump 23 is started. Water sequentially passes through the preheater 121, the evaporator 122, and the superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, enabling the steam turbine 221 to drive the generator 222 to generate power. The steam output by the steam turbine 221 passes through the condenser 223 and then condenses into water, which can enter the heat exchange unit 12 again to form a cycle.
[0046] In some embodiments, the above-mentioned solar thermal power generation system may be in a second operating mode. The second operating mode may be a heat collection power generation - heat collection energy storage mode. In the heat collection power generation - heat collection energy storage mode, the heat collection unit 1 is used for power generation and energy storage. In a scenario where power generation and energy storage can be carried out simultaneously, the above-mentioned solar thermal power generation system can be in the second operating mode.
[0047] Please refer to Figure 3 . The first oil pump 13 is started. The heat transfer oil enters the heat collection component 11 to be heated, and the heated high-temperature heat transfer oil is obtained. A part of the heated high-temperature heat transfer oil sequentially passes through the superheater 123, evaporator 122, and preheater 121 in the heat exchange unit 12, thereby heating water into high-temperature and high-pressure steam. Another part of the heated high-temperature heat transfer oil passes through the heat exchange component 32, thereby heating molten salt for energy storage. The cooled heat transfer oil output by the heat exchange unit 12 and the heat exchange component 32 re-enters the heat collection component 11 to be heated to form a cycle.
[0048] The water pump 23 is started. Water sequentially passes through the preheater 121, evaporator 122, and superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, so that the steam turbine 221 drives the generator 222 to generate electricity. The steam output by the steam turbine 221 can re-enter the heat exchange unit 12 after passing through the condenser 223 to form a cycle.
[0049] The second salt pump 35 is started, and the cold salt in the second salt tank 33 is pumped to the heat exchange component 32 to be heated, and then enters the first salt tank 31 for storage. Thus, energy storage is achieved.
[0050] In some embodiments, the above-mentioned solar thermal power generation system may be in a third operating mode. The third operating mode may be a heat collection power generation - electrical energy storage mode. In the heat collection power generation - electrical energy storage mode, the heat collection unit 1 is used for power generation, and at the same time, the electrical heating unit 4 is used for energy storage.
[0051] The first oil pump 13 is started. The heat transfer oil enters the heat collection component 11 to be heated, and the heated high-temperature heat transfer oil is obtained. The high-temperature heat transfer oil sequentially passes through the superheater 123, evaporator 122, and preheater 121 in the heat exchange unit 12, thereby heating water into high-temperature and high-pressure steam. The cooled heat transfer oil re-enters the heat collection component 11 to be heated to form a cycle.
[0052] The water pump 23 starts. Water sequentially passes through the preheater 121, the evaporator 122, and the superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, so that the steam turbine 221 drives the generator 222 to generate electricity. The steam output by the steam turbine 221 can enter the heat exchange unit 12 again after passing through the condenser 223, forming a cycle.
[0053] Please refer to Figure 4 The second salt pump 35 starts, pumps the cold salt in the second salt tank 33 to the electric heating unit 4 for heating, and then stores it in the first salt tank 31. Thus, heat storage is achieved.
[0054] In some embodiments, the above-mentioned solar thermal power generation system can be in the fourth operating mode. The fourth operating mode can be the concentrating power generation-concentrating heat storage-electric heat storage mode. In the concentrating power generation-concentrating heat storage-electric heat storage mode, the concentrating unit 1 is used for power generation and heat storage, and at the same time, the electric heating unit 4 is used for heat storage.
[0055] The first oil pump 13 starts. The heat transfer oil enters the heat collection component 11 for heating to obtain the heated high-temperature heat transfer oil. A part of the heated high-temperature heat transfer oil sequentially passes through the superheater 123, the evaporator 122, and the preheater 121 in the heat exchange unit 12, thereby heating water into high-temperature and high-pressure steam. Another part of the heated high-temperature heat transfer oil passes through the heat exchange component 32, thereby heating molten salt for heat storage. The cooled heat transfer oil output by the heat exchange unit 12 and the heat exchange component 32 enters the heat collection component 11 again for heating to form a cycle.
[0056] The water pump 23 starts. Water sequentially passes through the preheater 121, the evaporator 122, and the superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, so that the steam turbine 221 drives the generator 222 to generate electricity. The steam output by the steam turbine 221 can enter the heat exchange unit 12 again after passing through the condenser 223, forming a cycle.
[0057] The second salt pump 35 starts, pumps the cold salt in the second salt tank 33 to the heat exchange component 32 and the electric heating unit 4 for heating respectively, and then stores it in the first salt tank 31. Thus, heat storage is achieved.
[0058] In some embodiments, the above-mentioned solar thermal power generation system can be in the fifth operating mode. The fifth operating mode is the concentrating heat storage mode. In the concentrating heat storage mode, the above-mentioned solar thermal power generation system does not generate electricity, and the concentrating unit 1 can be used for heat storage.
[0059] Please refer to Figure 5. The first oil pump 13 starts. The heat-conducting oil enters the heat collection component 11 to be heated, obtaining the heated high-temperature heat-conducting oil. The heated high-temperature heat-conducting oil passes through the heat exchange component 32, thereby heating the molten salt for heat storage. The cooled heat-conducting oil output by the heat exchange component 32 enters the heat collection component 11 again to be heated to form a cycle.
[0060] The second salt pump 35 starts, pumps the cold salt in the second salt tank 33 to the heat exchange component 32 for heating, and then enters the first salt tank 31 for storage. Thus, heat storage is achieved.
[0061] In some embodiments, the above-mentioned solar thermal power generation system can be in the sixth operating mode. The sixth operating mode is the heat collection and storage - electrical energy storage mode. In the heat collection and storage - electrical energy storage mode, the above-mentioned solar thermal power generation system does not generate electricity, and the heat collection unit 1 and the electric heating unit 4 can be used for heat storage.
[0062] The first oil pump 13 starts. The heat-conducting oil enters the heat collection component 11 to be heated, obtaining the heated high-temperature heat-conducting oil. The heated high-temperature heat-conducting oil passes through the heat exchange component 32, thereby heating the molten salt for heat storage. The cooled heat-conducting oil output by the heat exchange component 32 enters the heat collection component 11 again to be heated to form a cycle.
[0063] The second salt pump 35 starts, pumps the cold salt in the second salt tank 33 to the heat exchange component 32 and the electric heating unit 4 for heating respectively, and then enters the first salt tank 31 for storage. Thus, heat storage is achieved.
[0064] In some embodiments, the above-mentioned solar thermal power generation system can be in the seventh operating mode. The seventh operating mode is the heat release and power generation mode. In the heat release and power generation mode, heat storage can be used for power generation. In case of bad weather conditions (such as rainy and cloudy days), the above-mentioned solar thermal power generation system can be in the seventh operating mode.
[0065] Please refer to Figure 6 . The second oil pump 14 starts. The heat-conducting oil enters the heat exchange component 32 to absorb heat and be heated. The high-temperature heat-conducting oil sequentially passes through the superheater 123, the evaporator 122, and the preheater 121 in the heat exchange unit 12, thereby heating water into high-temperature and high-pressure steam. The cooled heat-conducting oil enters the heat exchange component 32 again to be heated to form a cycle.
[0066] The first salt pump 34 starts, pumps the high-temperature hot salt in the first salt tank 31 to the heat exchange component 32 to release heat, and then enters the second salt tank 33 for storage.
[0067] The water pump 23 starts. Water sequentially passes through the preheater 121, the evaporator 122, and the superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, so that the steam turbine 221 drives the generator 222 to generate electricity. The steam output by the steam turbine 221 can enter the heat exchange unit 12 again after passing through the condenser 223, forming a cycle.
[0068] In some embodiments, the above-mentioned solar thermal power generation system can be in the eighth operating mode. The eighth operating mode is the heat release power generation - electric heat storage mode. In the heat release power generation - electric heat storage mode, the heat storage unit can be used for power generation, and at the same time, the electric heating unit 4 can be used for heat storage. In case of bad weather conditions (such as rainy or cloudy days), the above-mentioned solar thermal power generation system can be in the eighth operating mode, which is beneficial to extending the power generation duration of the solar thermal power generation system.
[0069] The second oil pump 14 starts. The heat transfer oil enters the heat exchange component 32 to absorb heat and increase in temperature. The high-temperature heat transfer oil sequentially passes through the superheater 123, the evaporator 122, and the preheater 121 in the heat exchange unit 12, thereby heating the water into high-temperature and high-pressure steam. The cooled heat transfer oil enters the heat exchange component 32 again to increase in temperature and form a cycle.
[0070] The first salt pump 34 starts, pumping the high-temperature hot salt in the first salt tank 31 to the heat exchange component 32 to release heat, and then entering the second salt tank 33 for storage.
[0071] The water pump 23 starts. Water sequentially passes through the preheater 121, the evaporator 122, and the superheater 123 in the heat exchange unit 12, thereby generating high-temperature and high-pressure steam. The auxiliary heating boiler 21 is used to perform secondary heating on the steam, which can increase the steam temperature. The steam after secondary heating enters the steam turbine 221 to do work, so that the steam turbine 221 drives the generator 222 to generate electricity. The steam output by the steam turbine 221 can enter the heat exchange unit 12 again after passing through the condenser 223, forming a cycle.
[0072] The second salt pump 35 starts, pumping the cold salt in the second salt tank 33 to the electric heating unit 4 for heating, and then entering the first salt tank 31 for storage. Thus, heat storage is achieved.
[0073] The solar thermal power generation system according to the embodiments of this specification can increase the steam temperature by using the auxiliary heating boiler 21 to perform secondary heating on the steam output by the heat exchange unit 12, thereby improving the power generation efficiency and having a relatively low cost. In addition, the auxiliary heating boiler 21 does not rely on solar energy and is not affected by weather conditions, and can achieve efficient power generation in case of bad weather conditions.
[0074] In the solar thermal power generation system according to the embodiments of this specification, the heat storage can be increased through the electric heating unit 4, which can extend the power generation duration of the solar thermal power generation system, increase the power generation amount of the solar thermal power generation system, and improve the long-term stable power generation ability of the solar thermal power generation system. The electric heating unit 4 can operate based on the low-price recycled electric energy or the abandoned wind and solar power, so that the molten salt can be heated by the electric heating unit 4 during the period of low electricity price or abandoned power, thereby improving the economy of the solar thermal power generation system. In addition, through the electric heating unit 4, continuous power generation can also be realized under bad weather conditions (such as rainy and cloudy days), improving the flexibility of the solar thermal power generation system.
[0075] The solar thermal power generation system according to the embodiments of this specification is equipped with a large-capacity, low-cost, and high-safety energy storage unit 3, which can achieve continuous, stable, and reliable power generation for 24 hours and has the ability to bear the base load. In addition, the solar thermal power generation system also has the advantages of large peak shaving depth, fast ramp rate, short start-up time, and bidirectional connection to the power grid, etc. It can flexibly and efficiently adjust the power generation peak, effectively make up for the intermittent and fluctuating problems commonly existing in photovoltaic, wind power, hydropower, etc., which is beneficial to improving the stability of electricity consumption in the whole region and all time periods, beneficial to the power balance of the power system, and can partially replace the conventional fossil-fueled generating units, and has important value for ensuring the safe and stable operation of a high-proportion renewable energy power grid.
[0076] Those skilled in the art can understand that the descriptions of the embodiments in this specification each have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. In addition, it can be understood that after reading this specification document, those skilled in the art can, without creative labor, think of arbitrarily combining some or all of the embodiments listed in this specification, and these combinations are also within the scope of disclosure and protection of this specification.
[0077] Although this specification is depicted through embodiments, those of ordinary skill in the art know that the above embodiments are only used to help understand the core idea of this specification. Those skilled in the art can understand that this specification has many deformations and changes. It is hoped that the appended claims will cover these deformations and changes without departing from the spirit of this specification.
Claims
1. A solar thermal power generation system, characterized in that: The solar thermal power generation system comprises a heat collection unit, a heat exchange unit and a power generation unit; the heat collection unit comprises a heat collection component; the power generation unit comprises a connected auxiliary heating boiler and a power generation component; the heat collection component is connected to the heat exchange unit, and the heat exchange unit is connected to the auxiliary heating boiler; The heat collecting component is used to heat the heat transfer oil using solar energy; The heat exchange unit is used to heat water into steam using the heat transfer oil output by the heat collecting component; The auxiliary heating boiler is used to heat the steam output by the heat exchange unit; The power generation component is used to generate electricity using the steam output by the auxiliary heating boiler.
2. The solar thermal power generation system according to claim 1, characterized in that: The heat collecting unit also includes an oil pump; the oil pump is connected to the heat collecting component and the heat exchange unit; the oil pump is used to pump the heat transfer oil output by the heat exchange unit into the heat collecting component, so that the heat collecting component heats the heat transfer oil output by the heat exchange unit.
3. The solar thermal power generation system according to claim 1, characterized in that: The power generation unit also includes a water pump; the water pump is connected to the heat exchange unit and the power generation component; the water pump is used to pump the water output by the power generation component into the heat exchange unit, so that the heat exchange unit heats the water output by the power generation component into steam.
4. The solar thermal power generation system according to claim 1, characterized in that: The solar thermal power generation system further includes an energy storage unit; the energy storage unit includes a first salt tank, a heat exchange component, and a second salt tank connected in sequence; The second salt tank is used to store molten salt; the heat exchange component is used to heat the molten salt in the second salt tank using the heat transfer oil output by the heat collection component; and the first salt tank is used to store the heated molten salt output by the heat exchange component.
5. The solar thermal power generation system according to claim 4, characterized in that: The energy storage unit also includes a second salt pump; the second salt pump is connected to the second salt tank and the heat exchange component; the second salt pump is used to pump the molten salt in the second salt tank into the heat exchange component, so that the heat exchange component heats the molten salt in the second salt tank.
6. The solar thermal power generation system according to claim 1, characterized in that: The solar thermal power generation system further includes an energy storage unit; the energy storage unit includes a first salt tank, a heat exchange component, and a second salt tank connected in sequence; The first salt tank is used to store molten salt; the heat exchange component is used to heat the heat transfer oil using the molten salt in the first salt tank; and the second salt tank is used to store the cooled molten salt output by the heat exchange component.
7. The solar thermal power generation system according to claim 6, characterized in that: The energy storage unit also includes a first salt pump; the first salt pump is connected to the first salt tank and the heat exchange component; the first salt pump is used to pump the molten salt in the first salt tank into the heat exchange component, so that the heat exchange component uses the molten salt in the first salt tank to heat the heat transfer oil.
8. The solar thermal power generation system according to claim 6, characterized in that: The heat exchange unit is also used to heat water into steam using the heat transfer oil output by the heat exchange component.
9. The solar thermal power generation system according to claim 4 or 6, characterized in that: The solar thermal power generation system also includes an electric heating unit; the electric heating unit is used to heat the molten salt in the second salt tank using electric energy; the first salt tank is also used to store the heated molten salt output by the electric heating unit.
10. The solar thermal power generation system according to claim 1, characterized in that: The auxiliary heating boiler is selected from an electric heating boiler and a biomass boiler.