Power station and power generation method for realizing high-capacity and high-parameter solar heat

Abstract

The invention discloses a power station and a power generation method for realizing high-capacity and high-parameter solar heat, and relates to the technical field of solar heat power generation. Comprising a segmented heating system for segmented heating of a heat storage medium in a plurality of heat collection fields, a steam-water pipeline system heated by the segmented heating system, a steam turbine communicated with the steam-water pipeline system and a generator driven by the steam turbine to generate electricity. According to the invention, the capacity and parameters of solar thermal power generation are improved in a manner of distributing and heating the heat transfer and storage medium step by step. Through the distribution and step-by-step heating mode, the single-machine capacity and power generation parameters of the solar thermal power station can be remarkably improved, and therefore the economical efficiency and the circulation efficiency of the power station are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar thermal power generation, and more specifically to the technical field of a large-capacity and high-parameter solar thermal power station and a power generation method. Background Art

[0002] Solar thermal power generation uses a large number of concentrators to convert low-density solar energy into high-density energy for the heat-absorbing medium to convert into heat energy. For conventional solar thermal power plants, when the concentrating and collecting system exceeds a certain scale, the technical and economic efficiency will be seriously reduced and the design and manufacture of equipment will be difficult; at the same time, the current heat transfer and heat storage materials with technical reliability and economy are usually solar molten salts, and the maximum safe operating temperature allowed by the molten salts cannot exceed 580°C. These two technical limitations have led to large differences in the current parameters of solar thermal power generation, such as single-unit power, power cycle temperature and pressure, compared with coal-fired power plants, which is not conducive to the further development of solar thermal power generation technology.

[0003] The patent with publication number CN103562503A discloses the following: A solar thermal power plant includes a solar radiation receiver mounted on a tower surrounded by a heliostat field to receive solar radiation reflected by the heliostats forming the heliostat field. The power plant includes a power generation line, which includes a steam turbine for driving a generator to generate electricity, and the water in the power generation line can be directly heated by the solar radiation reflected by the heliostat field to the solar radiation receiver to generate steam to drive the steam turbine. The power plant also includes an energy storage line, which includes a thermal energy storage fluid, such as molten salt, which can be directly heated by the solar radiation reflected by the heliostat field. A heat exchanger is also provided for recovering thermal energy from the thermal energy storage fluid in the energy storage line; the recovered thermal energy can then be used to generate steam to drive the steam turbine.

[0004] The patent with publication number CN101821502B discloses the following: A solar thermal power generation device, which includes a solar energy collection system and a steam power generation device. The solar energy collection system includes one or more tube radiation absorbers containing a thermal fluid, and the system is configured to heat the thermal fluid by allowing the thermal fluid to flow through the absorber while radiating the one or more tube radiation absorbers with solar radiation. The steam power generation device includes a medium-pressure steam turbine, a low-pressure steam turbine, at least one additional steam turbine (whose inlet pressure is higher than the inlet pressure of the medium-pressure steam turbine), and a pipeline containing a working fluid. Each turbine is associated with a heat exchange system suitable for transferring heat from a thermal fluid to a working fluid.

[0005] Both the conventional technology and the above patents have the following defects:

[0006] 1. The problem of significant decrease in mirror field efficiency after the single-stage heating scale of tower solar collector technology is increased;

[0007] 2. The problem of insufficient steam circulation temperature due to the limitation of the maximum operating temperature of the heat transfer material, thus affecting the power generation efficiency of the power station;

[0008] 3. The high operating cost of large-scale solar thermal power plants due to the use of single-stage heat collection;

[0009] 4. Give full play to the technical advantages of different solar collection technology routes (for example, the optical efficiency of trough mirror field is stable as the scale increases, but the seasonal output deviation is large and the high-temperature efficiency is low, while the optical efficiency of tower mirror field decreases as the scale of the mirror field increases, and the thermal system efficiency is high);

[0010] 5. To solve the problem of redundant material performance of thermal equipment caused by single-stage solar collection method, graded materials can be used according to the temperature range (for example, low-priced carbon steel or stainless steel can be used for low-temperature solar collection equipment, and expensive nickel-based materials can be used for high-temperature solar collection equipment). Summary of the invention

[0011] The purpose of the present invention is to solve the technical problems of the single-stage solar collection method, such as high mirror field efficiency, high operating cost, and surplus thermal equipment material performance, and to provide a large-capacity and high-parameter solar thermal power station and power generation method.

[0012] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0013] One aspect of the present invention provides a large-capacity, high-parameter solar thermal power station, comprising a segmented heating system for segmented heating of a heat storage medium by a plurality of collector fields, a steam-water pipeline system heated by the segmented heating system, a steam turbine connected to the steam-water pipeline system, and a generator driven by the steam turbine to generate electricity.

[0014] Specifically, multiple distributed collector fields are used to heat the heat storage medium in sections, and for different heating temperature ranges, the concentrated solar collector technology route, concentrated solar collector capacity, heat transfer materials, and heat storage materials that are more suitable for applications in this temperature zone are selected, so as to achieve the goal of large-capacity and high-parameter power generation in the field of solar thermal power generation, and provide technical support for solar thermal power generation to bear basic load and peak load.

[0015] This scheme is a method that makes full use of different solar thermal collection technology routes and optimizes capacity efficiency, conducts heat collection and storage and heat exchange design, and adopts distributed and step-by-step heating to achieve large-capacity and high-parameter power generation of solar thermal power generation.

[0016] In one embodiment, the thermal storage medium is one of solar molten salt, chloride salt or carbonate salt.

[0017] In one embodiment, the segmented heating system includes a low-temperature medium heating system, a medium-temperature medium heating system, a high-temperature medium heating system and a steam-water-salt heat exchange system. When the low-temperature medium heating system is provided, it is connected in parallel with the medium-temperature medium heating system and then in series with the high-temperature medium heating system to form an internal circulation system. When the low-temperature medium heating system is not provided, the medium-temperature medium heating system and the high-temperature medium heating system are connected in series to form an internal circulation system.

[0018] In one embodiment, the low-temperature medium heating system includes a low-temperature solar molten salt cold tank, a trough-type heat transfer oil collector field, and an oil-salt heat exchanger, a medium outlet of the low-temperature solar molten salt cold tank is connected to a medium inlet of the oil-salt heat exchanger, and two ends of the trough-type heat transfer oil collector field are respectively connected to an oil inlet and an oil outlet of the oil-salt heat exchanger;

[0019] The low-temperature medium heating system is set up according to technical and economic feasibility, and can be replaced by a medium-temperature medium heating system.

[0020] The medium-temperature medium heating system includes a medium-temperature tower heat absorber and a medium-temperature tower mirror field for heating the medium-temperature tower heat absorber. The medium inlet of the medium-temperature tower heat absorber is connected to another medium outlet of the solar molten salt cold tank; when a low-temperature medium heating system is provided, the medium outlet of the medium-temperature tower heat absorber merges with the medium outlet of the oil-salt heat exchanger; when a low-temperature heating system is not provided, the medium outlet of the medium-temperature tower heat absorber is connected to the medium inlet of the high-temperature medium heating system.

[0021] The high-temperature medium heating system includes a high-temperature tower mirror field, a high-temperature tower heat absorber and a solar molten salt high-temperature heat storage tank. The high-temperature tower mirror field heats the high-temperature tower heat absorber. The medium inlet of the high-temperature tower heat absorber is connected to the junction of the medium outlet of the medium-temperature tower heat absorber and the medium outlet of the oil-salt heat exchanger. The medium outlet of the high-temperature tower heat absorber is connected to the medium inlet of the gas-salt heat exchange system, and the medium outlet of the gas-salt heat exchange system is connected to the medium inlet of the low-temperature solar molten salt cold tank.

[0022] In one embodiment, the steam-water-salt heat exchange system includes a preheater, an evaporator, a high-temperature superheater, and a high-temperature reheater; the steam-water pipeline system includes a feed water pump, an air cooler, and a connecting pipeline between the steam-water and salt heat exchangers;

[0023] The medium outlet of the preheater is connected to the medium inlet of the low-temperature solar molten salt cold tank, the medium inlet of the preheater is connected to the medium outlet of the evaporator, the medium inlet of the evaporator is respectively connected to the medium outlet of the high-temperature superheater and the medium outlet of the high-temperature reheater, and the medium inlet of the high-temperature superheater and the medium inlet of the high-temperature reheater are both connected to the medium outlet of the solar molten salt high-temperature heat storage tank through pipelines;

[0024] The water side of the air cooler is connected to the feed water pump, the water outlet of the feed water pump is connected to the water inlet of the preheater, the water outlet of the preheater is connected to the water inlet of the evaporator, the steam outlet of the evaporator is connected to the air inlet of the high-temperature superheater, and the steam outlet of the high-temperature superheater is connected to the steam inlet of the steam turbine;

[0025] The steam inlet and outlet of the high-temperature reheater are connected to the steam outlet and steam inlet of the steam turbine through pipelines.

[0026] In one embodiment, it further includes an ultra-high temperature medium heating system and an ultra-high temperature steam heating system heated by the ultra-high temperature medium heating system.

[0027] In one embodiment, the ultra-high temperature medium heating system includes a molten salt low temperature heat storage tank of a heat collection system, an ultra-high temperature tower heat absorber, an ultra-high temperature tower mirror field, and a molten salt high temperature heat storage tank of a heat collection system;

[0028] The ultra-high temperature steam heating system includes an ultra-high temperature superheater, a first-stage reheater and a second-stage reheater;

[0029] The ultra-high temperature tower mirror field heats the ultra-high temperature tower heat absorber, the medium outlet of the ultra-high temperature tower heat absorber is connected to the medium inlet of the ultra-high temperature heat collection system molten salt high temperature heat storage tank, the medium outlet of the ultra-high temperature heat collection system molten salt high temperature heat storage tank is respectively connected to the medium inlet of the ultra-high temperature superheater, the medium inlet of the first-stage reheater and the medium inlet of the second-stage reheater, the medium outlet of the ultra-high temperature superheater, the medium outlet of the first-stage reheater and the medium outlet of the second-stage reheater are all connected to the medium inlet of the ultra-high temperature heat collection system molten salt low temperature heat storage tank, and the medium outlet of the ultra-high temperature heat collection system molten salt low temperature heat storage tank is connected to the medium inlet of the ultra-high temperature tower heat absorber;

[0030] The steam inlet of the ultra-high temperature superheater is connected to the steam outlet of the high temperature preheater, and the steam outlet of the ultra-high temperature superheater is connected to the steam inlet of the steam turbine.

[0031] In one embodiment, the steam outlet and steam inlet of the first-stage reheater are respectively connected to the steam inlet and steam outlet of the steam turbine.

[0032] In one embodiment, the steam outlet and steam inlet of the secondary reheater are respectively connected to the steam inlet and steam outlet of the steam turbine.

[0033] Another aspect of the present invention provides a method for realizing large-capacity and high-parameter solar thermal power generation, using a large-capacity and high-parameter solar thermal power station.

[0034] In this scheme, according to the requirements of steam temperature for each level of steam turbine of solar thermal power station, the corresponding heat collection temperature is designed and the design method of heat storage medium is determined accordingly; for different levels of heating temperature, different concentrated heat collection technology routes and technical schemes are selected and the material selection of thermal equipment is graded for design; according to the requirements of steam generation system for heat storage and heat storage temperature, a combination selection and design method of linear Fresnel, trough and tower technology routes is adopted; by adopting distributed and graded heating for the same heat transfer and storage material, a design method of long-term heat storage and power generation of 350MWe and above large-capacity units for more than 6 hours is realized; by adopting distributed and graded heating for heat transfer and storage materials with different temperature resistance, a design method of long-term heat storage and power generation of 350MWe and above large-capacity super (ultra) critical units for more than 6 hours is realized.

[0035] The beneficial effects of the present invention are as follows:

[0036] The present invention is reasonably designed, that is, the capacity and parameters of solar thermal power generation are improved by distributing and heating the heat transfer and heat storage medium step by step. The advantages brought by this method of distributing and heating the heat transfer and heat storage medium step by step are as follows: configuring heat collecting equipment with relatively low performance and material requirements at the low temperature level to heat the low-cost heat storage medium on a large scale; configuring heat collecting equipment with general performance and material requirements at the medium temperature level to heat the medium temperature heat storage medium on a large scale; configuring heat collecting equipment with high performance and material requirements at the high temperature level to heat the high temperature heat storage medium on a large scale. Through this distributed and step-by-step heating method, the single-unit capacity and power generation parameters of the solar thermal power station can be significantly improved, thereby improving the economy and cycle efficiency of the power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 It is a low-temperature trough-type heat transfer oil collector with a heating temperature below 380°C;

[0040] Figure 3 It is a high-temperature concentrated solar field with a heating temperature below 600℃;

[0041] Figure 4 It is an ultra-high temperature concentrated solar field with a heating temperature higher than 600℃;

[0042] Figure markings: 1-solar molten salt cold tank, 2-trough type thermal oil collector field, 3-oil-salt heat exchanger, 4-medium temperature tower mirror field, 5-medium temperature tower absorber, 6-high temperature tower mirror field, 7-high temperature tower absorber, 8-ultra-high temperature tower mirror field, 9-ultra-high temperature tower absorber, 10-solar molten salt high temperature heat storage tank, 11-ultra-high temperature collector system molten salt low temperature heat storage tank, 12-ultra-high temperature collector system molten salt high temperature heat storage tank, 13-preheater, 14-evaporator, 15-high temperature superheater, 16-high temperature reheater, 17-ultra-high temperature superheater, 18-first stage reheater, 19-second stage reheater, 20-steam turbine, 21-generator, 22-feedwater pump, 23-air cooler. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and technical effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] Example 1

[0048] The present embodiment provides a large-capacity, high-parameter solar thermal power station, including a segmented heating system for segmented heating of a heat storage medium by a plurality of collector fields, a steam-water pipeline system heated by the segmented heating system, a steam turbine 20 connected to the steam-water pipeline system, and a generator 21 driven by the steam turbine 20 to generate electricity.

[0049] Specifically, multiple distributed collector fields are used to heat the heat storage medium in sections, and for different heating temperature ranges, the concentrated solar collector technology route, concentrated solar collector capacity, heat transfer materials, and heat storage materials that are more suitable for applications in this temperature zone are selected, so as to achieve the goal of large-capacity and high-parameter power generation in the field of solar thermal power generation, and provide technical support for solar thermal power generation to bear basic load and peak load.

[0050] This scheme is a method that makes full use of different solar thermal collection technology routes and optimizes capacity efficiency, conducts heat collection and storage and heat exchange design, and adopts distributed and step-by-step heating to achieve large-capacity and high-parameter power generation of solar thermal power generation.

[0051] The heat storage medium is one of solar molten salt, chloride salt or carbonate.

[0052] The segmented heating system includes a low-temperature medium heating system, a medium-temperature medium heating system, a high-temperature medium heating system and a steam-water-salt heat exchange system. When the low-temperature medium heating system is provided, the low-temperature medium heating system is connected in parallel with the medium-temperature medium heating system and then in series with the high-temperature medium heating system to form an internal circulation system; when the low-temperature medium heating system is not provided, the medium-temperature medium heating system is connected in series with the high-temperature medium heating system to form an internal circulation system.

[0053] The low-temperature medium heating system comprises a low-temperature solar molten salt cold tank 1, a trough-type heat transfer oil heat collection field 2 and an oil-salt heat exchanger 3. A medium outlet of the low-temperature solar molten salt cold tank 1 is connected to a medium inlet of the oil-salt heat exchanger 3, and two ends of the trough-type heat transfer oil heat collection field 2 are respectively connected to an oil inlet and an oil outlet of the oil-salt heat exchanger 3.

[0054] The medium-temperature medium heating system includes a medium-temperature tower heat absorber 5 and a medium-temperature tower mirror field 4 for heating the medium-temperature tower heat absorber 5. The medium inlet of the medium-temperature tower heat absorber 5 is connected to another medium outlet of the solar molten salt cold tank 1. When a low-temperature medium heating system is provided, the medium outlet of the medium-temperature tower heat absorber 5 merges with the medium outlet of the oil-salt heat exchanger 3; when no low-temperature heating system is provided, the medium outlet of the medium-temperature tower heat absorber 5 is connected to the medium inlet of the high-temperature medium heating system.

[0055] The high-temperature medium heating system includes a high-temperature tower mirror field 6, a high-temperature tower heat absorber 7 and a solar molten salt high-temperature heat storage tank 10. The high-temperature tower mirror field 6 heats the high-temperature tower heat absorber 7. The medium inlet of the high-temperature tower heat absorber 7 is connected to the junction of the medium outlet of the medium-temperature tower heat absorber 5 and the medium outlet of the oil-salt heat exchanger 3. The medium outlet of the high-temperature tower heat absorber 7 is connected to the medium inlet of the steam-water-salt heat exchange system, and the medium outlet of the steam-water-salt heat exchange system is connected to the medium inlet of the low-temperature solar molten salt cold tank 1.

[0056] The steam-water-salt heat exchange system includes a preheater 13, an evaporator 14, a high-temperature superheater 15, and a high-temperature reheater 16; the steam-water pipeline system includes a feed water pump 22, an air cooler 23, and connecting pipelines between the preheater 13, the evaporator 14, the high-temperature superheater 15, and the high-temperature reheater 16;

[0057] The medium outlet of the preheater 13 is connected to the medium inlet of the low-temperature solar molten salt cold tank 1, the medium inlet of the preheater 13 is connected to the medium outlet of the evaporator 14, the medium inlet of the evaporator 14 is respectively connected to the medium outlet of the high-temperature superheater 15 and the medium outlet of the high-temperature reheater 16, and the medium inlet of the high-temperature superheater 15 and the medium inlet of the high-temperature reheater 16 are both connected to the medium outlet of the solar molten salt high-temperature heat storage tank 10 through pipelines;

[0058] The water side of the air cooler 23 is connected to the feed water pump 22, the water outlet of the feed water pump 22 is connected to the water inlet of the preheater 13, the water outlet of the preheater 13 is connected to the water inlet of the evaporator 14, the steam outlet of the evaporator 14 is connected to the steam inlet of the high-temperature preheater 15, and the steam outlet of the high-temperature superheater 15 is connected to the steam inlet of the steam turbine 20;

[0059] The steam inlet and outlet of the high-temperature reheater 16 are respectively connected to the steam outlet and steam inlet of the steam turbine 20 through pipelines.

[0060] It also includes an ultra-high temperature medium heating system and an ultra-high temperature steam heating system heated by the ultra-high temperature medium heating system.

[0061] The ultra-high temperature medium heating system includes a heat collection system molten salt low temperature heat storage tank 11, an ultra-high temperature tower heat absorber 97, an ultra-high temperature tower mirror field 86 and a heat collection system molten salt high temperature heat storage tank 12;

[0062] The ultra-high temperature steam heating system includes an ultra-high temperature superheater 17, a primary reheater 18 and a secondary reheater 19;

[0063] The ultra-high temperature tower mirror field 8 heats the ultra-high temperature tower heat absorber 9, the medium outlet of the ultra-high temperature tower heat absorber 9 is connected to the medium inlet of the ultra-high temperature heat collection system molten salt high temperature heat storage tank 12, the medium outlet of the ultra-high temperature heat collection system molten salt low temperature heat storage tank 11 is respectively connected to the medium inlet of the ultra-high temperature superheater 17, the medium inlet of the first stage reheater 18 and the medium inlet of the second stage reheater 19, the medium outlet of the ultra-high temperature superheater 17, the medium outlet of the first stage reheater 18 and the medium outlet of the second stage reheater 19 are all connected to the medium inlet of the ultra-high temperature heat collection system molten salt low temperature heat storage tank 11, and the medium outlet of the ultra-high temperature heat collection system molten salt low temperature heat storage tank 11 is connected to the medium inlet of the ultra-high temperature tower heat absorber 9;

[0064] The steam inlet of the ultra-high temperature superheater 17 is communicated with the steam outlet of the high temperature superheater 15 , and the steam outlet of the ultra-high temperature superheater 17 is communicated with the air inlet of the steam turbine 20 .

[0065] The steam outlet and steam inlet of the first-stage reheater 18 are connected to the steam inlet and steam outlet of the steam turbine 20 respectively.

[0066] The steam outlet and steam inlet of the secondary reheater 19 are connected to the steam inlet and steam outlet of the steam turbine 20 respectively.

[0067] According to the requirements of steam temperature at each level of the solar thermal power station turbine 20, the corresponding heat collection temperature is designed and the design method of heat storage medium is determined accordingly; for different levels of heating temperature, different concentrated heat collection technology routes and technical solutions are selected and the thermal equipment material selection is graded for design; according to the requirements of the steam generation system for heat storage and heat storage temperature, a combination selection and design method of linear Fresnel, trough and tower technology routes is used; by adopting distributed and graded heating for the same heat transfer and storage material, a design method for long-term heat storage power generation of 350MWe and above large-capacity units for more than 6 hours is realized; by adopting distributed and graded heating for heat transfer and storage materials with different temperature resistance, a design method for long-term heat storage power generation of 350MWe and above large-capacity super (ultra) critical units for more than 6 hours is realized.

[0068] Example 2

[0069] like Figures 1 to 4 As shown, this embodiment provides a method for realizing large-capacity and high-parameter solar thermal power generation.

[0070] This solution is applied to large-scale high-parameter solar thermal power stations. Taking a 350MWe (super)critical power station with a mirror area of ​​2.8 million square meters as an example, it is explained as follows:

[0071] The present invention is divided into four sections of heating systems: a low-temperature medium heating system, a medium-temperature medium heating system, a high-temperature medium heating system, and an ultra-high-temperature medium heating system.

[0072] The low-temperature medium heating system adopts trough-type heat transfer oil concentrated heat collection technology;

[0073] The medium-temperature medium heating system is a primary mirror field, using tower-type solar molten salt concentrating heat collection technology;

[0074] The high-temperature medium heating system is an intermediate-level mirror field, using tower-type solar molten salt concentrating heat collection technology;

[0075] The ultra-high temperature medium heating system is the final mirror field, using tower chloride or carbonate concentrating solar heat collection technology;

[0076] The heat load ratio between the low-temperature medium heating system, the medium-temperature medium heating system, the high-temperature medium heating system and the ultra-high-temperature medium heating system is approximately 2-5:1-0. According to the same photothermal efficiency, the mirror field areas of the medium-temperature medium heating system and the high-temperature medium heating system and the ultra-high-temperature medium heating system are 2 million square meters and 800,000 square meters respectively.

[0077] 2 million square meters of primary and intermediate mirror fields, consisting of a Figure 2 The 800,000 square meters of trough heat transfer oil collector field 2 or medium temperature tower mirror field 4 (heating medium to 380°C) shown in the figure is similar to the Figure 3 The shown structure consists of two 600,000 square meter high-temperature tower mirror fields 6 (the medium is heated to 560° C.).

[0078] The final mirror field of 800,000 square meters consists of a Figure 3 The shown structure is an 800,000 square meter ultra-high temperature tower mirror field 86 (medium heated to 650°C).

[0079] Working principle:

[0080] During operation, a pump first delivers 290°C cold solar molten salt into the Figure 2 The low-temperature medium heating system and the medium-temperature medium heating system are heated to 380°C in the collector field to become medium-temperature solar molten salt, which is then sent to the Figure 3 The two parallel high-temperature medium heating systems below 600°C are heated to 560°C and then stored in the solar molten salt high-temperature heat storage tank 10. For the concentrated solar field with a heating temperature above 600°C, the heat storage medium is chloride salt, carbonate or solid particles.

[0081] For large solar thermal power stations below 400℃, it can also be used directly Figure 2 The independent collector field shown in the figure can be used for large-scale high-temperature solar thermal power stations with a circulation temperature greater than 400 and less than 550°C. Figure 2 and Figure 3 The combination will also be multiple Figure 3For large-scale high-temperature solar thermal power stations with a circulation temperature above 600°C, Figure 2 or (and) Figure 3 and Figure 4 The collector fields shown are combined and applied in series or parallel.

Claims

1. A large-capacity and high-parameter solar thermal power station, characterized in that: The invention comprises a segmented heating system for segmentally heating a heat storage medium using a plurality of heat collecting fields, a steam-water pipeline system heated by the segmented heating system, a steam turbine (20) connected to the steam-water pipeline system, and a generator (21) driven by the steam turbine (20) to generate electricity.

2. A large-capacity and high-parameter solar thermal power station according to claim 1, characterized in that: The heat storage medium is one of solar molten salt, chloride salt or carbonate.

3. A large-capacity and high-parameter solar thermal power station according to claim 2, characterized in that: The segmented heating system includes a low-temperature medium heating system, a medium-temperature medium heating system, a high-temperature medium heating system and a steam-water-salt heat exchange system. When the low-temperature medium heating system is provided, the low-temperature medium heating system is connected in parallel with the medium-temperature medium heating system and then in series with the high-temperature medium heating system to form an internal circulation system; when the low-temperature medium heating system is not provided, the medium-temperature medium heating system is connected in series with the high-temperature medium heating system to form an internal circulation system.

4. A large-capacity and high-parameter solar thermal power station according to claim 3, characterized in that: The low-temperature medium heating system comprises a low-temperature solar molten salt cold tank (1), a trough-type heat transfer oil heat collection field (2) and an oil-salt heat exchanger (3); a medium outlet of the low-temperature solar molten salt cold tank (1) is connected to a medium inlet of the oil-salt heat exchanger (3); and two ends of the trough-type heat transfer oil heat collection field (2) are respectively connected to an oil inlet and an oil outlet of the oil-salt heat exchanger (3); The medium-temperature medium heating system comprises a medium-temperature tower heat absorber (5) and a medium-temperature tower mirror field (4) for heating the medium-temperature tower heat absorber (5); the medium inlet of the medium-temperature tower heat absorber (5) is connected to another medium outlet of the solar molten salt cold tank (1); when a low-temperature medium heating system is provided, the medium outlet of the medium-temperature tower heat absorber (5) merges with the medium outlet of the oil-salt heat exchanger (3); when no low-temperature heating system is provided, the medium outlet of the medium-temperature tower heat absorber (5) is connected to the medium inlet of the high-temperature medium heating system; The high-temperature medium heating system comprises a high-temperature tower mirror field (6), a high-temperature tower heat absorber (7) and a solar molten salt high-temperature heat storage tank (10). The high-temperature tower mirror field (6) heats the high-temperature tower heat absorber (7). The medium inlet of the high-temperature tower heat absorber (7) is connected to the confluence of the medium outlet of the medium-temperature tower heat absorber (5) and the medium outlet of the oil-salt heat exchanger (3). The medium outlet of the high-temperature tower heat absorber (7) is connected to the medium inlet of the steam-water-salt heat exchange system. The medium outlet of the steam-water-salt heat exchange system is connected to the medium inlet of the low-temperature solar molten salt cold tank (1).

5. A large-capacity and high-parameter solar thermal power station according to claim 4, characterized in that: The steam-water-salt heat exchange system comprises a preheater (13), an evaporator (14), a high-temperature superheater (15), and a high-temperature reheater (16); the steam-water pipeline system comprises a feed water pump (22), an air cooler (23), a preheater (13), an evaporator (14), a high-temperature superheater (15), and connecting pipelines between the high-temperature reheater (16); The medium outlet of the preheater (13) is connected to the medium inlet of the low-temperature solar molten salt cold tank (1), the medium inlet of the preheater (13) is connected to the medium outlet of the evaporator (14), the medium inlet of the evaporator (14) is respectively connected to the medium outlet of the high-temperature superheater (15) and the medium outlet of the reheater (16), and the medium inlet of the high-temperature superheater (15) and the medium inlet of the reheater (16) are both connected to the medium outlet of the solar molten salt high-temperature heat storage tank (10) through pipelines; The water side of the air cooler (23) is connected to the water feed pump (22), the water outlet of the water feed pump (22) is connected to the water inlet of the preheater (13), the water outlet of the preheater (13) is connected to the water inlet of the evaporator (14), the steam outlet of the evaporator (14) is connected to the steam inlet of the high-temperature superheater (15), and the steam outlet of the high-temperature superheater (15) is connected to the steam inlet of the steam turbine (20); The steam inlet and outlet of the high-temperature reheater (16) are respectively connected to the steam outlet and steam inlet of the steam turbine (20) through pipelines.

6. A large-capacity and high-parameter solar thermal power station according to claim 5, characterized in that: It also includes an ultra-high temperature medium heating system and an ultra-high temperature steam heating system heated by the ultra-high temperature medium heating system.

7. A large-capacity and high-parameter solar thermal power station according to claim 6, characterized in that: The ultra-high temperature medium heating system comprises a heat collection system molten salt low temperature heat storage tank (11), an ultra-high temperature tower heat absorber (9), an ultra-high temperature tower mirror field (8) and a heat collection system molten salt high temperature heat storage tank (12); The ultra-high temperature steam heating system comprises an ultra-high temperature superheater (17), a primary reheater (18) and a secondary reheater (19); The ultra-high temperature tower mirror field (8) heats the ultra-high temperature tower heat absorber (9); the medium outlet of the ultra-high temperature tower heat absorber (9) is connected to the medium inlet of the molten salt high temperature heat storage tank (12) of the heat collection system; the medium outlet of the molten salt high temperature heat storage tank (12) of the heat collection system is respectively connected to the medium inlet of the ultra-high temperature superheater (17), the medium inlet of the first stage reheater (18) and the medium inlet of the second stage reheater (19); the medium outlet of the ultra-high temperature superheater (17), the medium outlet of the first stage reheater (18) and the medium outlet of the second stage reheater (19) are all connected to the medium inlet of the molten salt low temperature heat storage tank (11) of the heat collection system; the medium outlet of the molten salt low temperature heat storage tank (11) of the heat collection system is connected to the medium inlet of the ultra-high temperature tower heat absorber (9); The air inlet of the ultra-high temperature superheater (17) is connected to the steam outlet of the high temperature superheater (15), and the steam outlet of the ultra-high temperature superheater (17) is connected to the steam inlet of the steam turbine (20).

8. A large-capacity and high-parameter solar thermal power station according to claim 7, characterized in that: The steam outlet and steam inlet of the first-stage reheater (18) are respectively connected to the air inlet and air outlet of the steam turbine (20).

9. A large-capacity and high-parameter solar thermal power station according to claim 7, characterized in that: The steam outlet and steam inlet of the secondary reheater (19) are respectively connected to the air inlet and air outlet of the steam turbine (20).

10. A method for realizing large-capacity and high-parameter solar thermal power generation, characterized in that: A large-capacity and high-parameter solar thermal power station is realized by using a method as described in any one of claims 1 to 9.

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