Heat supply system and photo-thermal calcium-based particle power station and coal power unit coupled power generation system

Abstract

The invention discloses a heat supply system and a power generation system with a photo-thermal calcium-based particle power station and a coal power unit coupled. The heat supply system comprises a calcium-based particle tower type heat absorption subsystem, a power plant calcium-based particle heat release subsystem, a first pipeline and a second pipeline. The calcium-based particle tower type heat absorption subsystem comprises a heat absorber and a first heat exchanger; the power plant calcium-based particle heat release subsystem comprises a second heat exchanger; the first pipeline is connected with the heat absorber, the first heat exchanger and the second heat exchanger; the second pipeline is connected with the second heat exchanger, the first heat exchanger and the heat absorber, the flowing direction of the calcium-based particles in the first pipeline is opposite to that of the calcium-based particles in the second pipeline, a circulating flow path is formed, and the calcium-based particles in the first pipeline are different from the calcium-based particles in the second pipeline. By means of the mode, the heat absorption process and the heat release process of the solar power station are separated, calcium-based particles conduct heat absorption and heat release in the heat absorber and the second heat exchanger respectively, power generation or heat supply is conducted, and solar energy is effectively collected and converted into available heat energy.

Description

Technical Field

[0001] The present invention relates to the technical field of calcium-based particle heating and coal-fired unit power generation, and specifically to a heating system and a power generation system in which a solar thermal calcium-based particle power station is coupled with a coal-fired power unit. Background Art

[0002] In the prior art, tower solar power stations often use molten salt as a heat exchange medium, and complete the steps of molten salt absorbing heat, molten salt and water heat exchange to generate steam, and steam power generation at the power station.

[0003] In the process from sunlight to final electricity output, each step of conversion will bring about a certain amount of energy loss, such as thermal radiation loss during heat absorption, heat conduction loss during molten salt flow, and mechanical loss during steam power generation. The energy utilization efficiency of molten salt tower solar power stations in the entire power generation process is low. Summary of the Invention

[0004] In response to the above problems, the present invention provides a heating system and a power generation system coupling a solar thermal calcium-based particle power station with a coal-fired power unit, to at least solve some of the problems in the prior art.

[0005] A first aspect of the present invention provides a heating system comprising a calcium-based particle tower heat absorption subsystem, a power plant calcium-based particle heat release subsystem, a first pipeline, and a second pipeline. The calcium-based particle tower heat absorption subsystem comprises a heat absorber and a first heat exchanger; the power plant calcium-based particle heat release subsystem comprises a second heat exchanger; the first pipeline sequentially connects the heat absorber, the first heat exchanger, and the second heat exchanger; and the second pipeline sequentially connects the second heat exchanger, the first heat exchanger, and the heat absorber. The flow direction of the calcium-based particles in the first pipeline is opposite to the flow direction of the calcium-based particles in the second pipeline, forming a circulation flow path. The calcium-based particles in the first pipeline are different from the calcium-based particles in the second pipeline.

[0006] In this way, the first and second pipes connect the calcium-based particle tower heat absorption subsystem and the power plant calcium-based particle heat release subsystem, isolating the heat absorption and heat release processes at the solar power station. The calcium-based particles input through the second pipe are heated to a high temperature and converted in the heat absorber. They are then transferred through the first pipe to the second heat exchanger, where they release heat and are converted again, forming a cycle for power generation or heat supply. Simultaneously, the calcium-based particles, acting as a transmission and storage medium for thermal energy, can effectively collect solar energy and convert it into usable thermal energy, thereby improving heating efficiency.

[0007] Optionally, the calcium-based particles in the first pipe are CaO, and the calcium-based particles in the second pipe are CaCO3.

[0008] In the above manner, the calcium-based particles in the second pipe and the calcium-based particles in the first pipe can be converted into each other through endothermic reaction and exothermic reaction, which is convenient for collecting solar energy and providing heat.

[0009] Optionally, the heat absorber receives CaCO3 from the second pipe, absorbs heat to generate CaO, and flows into the first pipe. The chemical equation for the endothermic reaction of the calcium-based particles is:

[0010] CaCO3=CaO+CO2。

[0011] In the above manner, the CaCO3 in the second pipe can undergo an endothermic reaction at the absorber and be converted into CaO and flow into the first pipe, so that the heat energy required for the endothermic reaction can be obtained from solar energy, which facilitates the rational use of solar energy.

[0012] Optionally, the second heat exchanger receives CaO from the first pipeline, releases heat to generate CaCO3, and flows into the second pipeline. The chemical equation for the exothermic reaction of the calcium-based particles is:

[0013] CaO+CO2=CaCO3

[0014] In the above manner, the CaO in the first pipeline can undergo an exothermic reaction at the second heat exchanger and be converted into CaCO3 and flow into the second pipeline, so that the heat energy generated by the exothermic reaction can be used for heating.

[0015] Optionally, the first pipe flows through the first heat exchanger to form a first inlet and a first outlet, and the second pipe flows through the first heat exchanger to form a second inlet and a second outlet. The CaO flowing into the first heat exchanger through the first inlet and the CaCO3 flowing into the first heat exchanger through the second inlet exchange heat with each other and then flow out from the first outlet and the second outlet respectively.

[0016] In the above manner, the calcium-based particles in the first pipe and the calcium-based particles in the second pipe can exchange heat at the first heat exchanger, which is convenient for cooling the calcium-based particles in the first pipe and heating the calcium-based particles in the second pipe, so as to facilitate subsequent chemical reactions of the calcium-based particles.

[0017] Optionally, the calcium-based particle tower heat absorption subsystem further includes a high-temperature calcium-based particle storage tank, which is provided on the first pipeline and between the heat absorber and the first heat exchanger.

[0018] Through the above method, the high-temperature calcium-based particles output by the heat absorber are placed in the high-temperature calcium-based particle storage tank for temporary storage as a buffer node to prevent pressure shock caused by sudden changes in the flow of the first pipeline and improve the flexibility of calcium-based particle scheduling.

[0019] Optionally, the power plant calcium-based particle heat release subsystem further includes a low-temperature calcium-based particle storage tank, which is provided on the first pipeline and between the first heat exchanger and the second heat exchanger.

[0020] Through the above method, the low-temperature calcium-based particles output by the first heat exchanger are placed in the low-temperature calcium-based particle storage tank for temporary storage as a buffer node to prevent the pressure shock caused by the sudden change of the flow in the first pipeline, and at the same time provide a circulation basis for the heat exchange side of the subsequent second heat exchanger.

[0021] Optionally, the first pipe and / or the second pipe is provided with a corner, the corner is located between the first heat exchanger and the second heat exchanger, and the position of the corner is higher than the positions of both end portions of the first pipe and / or the second pipe.

[0022] Through the above method, the structural design of the pipeline at the high corner can ensure that the calcium-based particles flow smoothly to the heat exchangers connected at both ends of the pipeline under the action of gravity, reducing the accumulation of calcium-based particles inside the pipeline, thereby avoiding pipeline blockage caused by local deposition of calcium-based particles and ensuring continuous energy supply of the heating system.

[0023] A second aspect of the present invention provides a power generation system coupling a solar thermal calcium-based particle power station with a coal-fired power unit, including the above-mentioned heating system.

[0024] Through the above methods, the heating system, as the heat energy input subsystem of the power generation system, can provide a stable high-temperature heat source for the power generation process of the power generation system. The calcium-based particles complete the processes of heat absorption, storage, heat exchange and reflux in the heating system, realizing the closed-loop operation of the entire process from solar energy collection, heat energy storage, thermoelectric conversion to power output, effectively improving the energy utilization efficiency of the power generation system and improving the operating stability of the power generation system.

[0025] Optionally, the power generation system of the solar thermal calcium-based particle power station coupled with the coal-fired power unit also includes a mirror field subsystem and a power plant boiler power generation subsystem. The calcium-based particle tower heat absorption subsystem is coupled to the mirror field subsystem, and the mirror field subsystem is used to reflect solar energy and transfer heat to the heat absorber; the power plant calcium-based particle heat release subsystem is arranged in the power plant boiler power generation subsystem, and the power plant boiler power generation subsystem is located downstream of the power plant calcium-based particle heat release subsystem of the heating system. The heat exchange medium is suitable for flowing through the second heat exchanger of the power plant calcium-based particle heat release subsystem for heat exchange and then flows to the power plant boiler power generation subsystem.

[0026] Through the above methods, through the organic integration of the mirror field subsystem, the calcium-based particle tower heat absorption subsystem, the power plant calcium-based particle heat release subsystem and the power plant boiler power generation subsystem, the efficient conversion and stable operation of the whole process from solar energy collection, thermal energy storage, thermoelectric conversion to power output are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1Schematic diagram of a power generation system in an embodiment of the present invention.

[0028] Reference numerals:

[0029] 100. Power generation system;

[0030] 1. Heating system;

[0031] 10. Mirror field subsystem; 11. Heliostat;

[0032] 20. Calcium-based particle tower heat absorption subsystem; 21. Heat absorption tower; 22. Heat absorber; 23. High-temperature calcium-based particle storage tank; 24. First heat exchanger;

[0033] 30. Power plant calcium-based pellet heat release subsystem; 31. Second heat exchanger; 32. Low-temperature calcium-based pellet storage tank;

[0034] 40. Power plant boiler generator system;

[0035] 50. First pipeline;

[0036] 60. Second pipeline. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] <Heating system 1>

[0039] Figure 1 Schematic diagram of a power generation system 100 in an embodiment of the present invention. Figure 1 The heating system 1 provided in the first embodiment of the present invention can be applied to a power generation system 100 in which a solar thermal calcium-based particle power station is coupled with a coal-fired power unit. The heating system 1 includes a calcium-based particle tower heat absorption subsystem 20, a power plant calcium-based particle heat release subsystem 30, a first pipeline 50 and a second pipeline 60.

[0040] The calcium-based particle tower heat absorption subsystem 20 includes a heat absorption tower 21 and a first heat exchanger 24. Heat absorber 22 is located at the top of heat absorption tower 21. The calcium-based particle tower heat absorption subsystem 20 is coupled to the mirror field subsystem 10. The mirror field subsystem 10 is equipped with multiple heliostats 11, which reflect and focus sunlight onto heat absorber 22 at the top of heat absorption tower 21. Heat absorber 22 converts solar energy into thermal energy.

[0041] The power plant calcium-based particle heat release subsystem 30 includes a second heat exchanger 31. The high-temperature calcium-based particles (including sensible heat and chemical heat) flow from the heat absorber 22 to the first heat exchanger 24 through the first pipe 50, and exchange heat with the low-temperature calcium-based particles flowing into the first heat exchanger 24 through the second pipe 60 to form low-temperature calcium-based particles (only releasing sensible heat and retaining chemical heat), and continue to flow to the second heat exchanger 31 for heat exchange. A heat exchange medium (for example, water) is provided in the second heat exchanger 31. The low-temperature calcium-based particles chemically react with the heat exchange medium in the second heat exchanger 31 and exchange heat. The chemical heat carried by the low-temperature calcium-based particles is transferred to the heat exchange medium in the second heat exchanger 31.

[0042] During the flow through the first pipe 50, the high-temperature calcium-based particles cool down to become low-temperature calcium-based particles. The low-temperature calcium-based particles then flow from the second heat exchanger 31 to the first heat exchanger 24 through the second pipe 60. There, they exchange heat with the high-temperature calcium-based particles flowing from the first pipe 50 into the first heat exchanger 24, forming high-temperature calcium-based particles that continue to flow to the heat absorber 22, initiating the heat exchange process. This forms a closed calcium-based particle circulation path. The calcium-based particles in the first pipe 50 and the second pipe 60 are of different types.

[0043] The power plant calcium-based particle heat release subsystem 30 is arranged in the power plant boiler power generation subsystem 40. The power plant boiler power generation subsystem 40 is located downstream of the power plant calcium-based particle heat release subsystem 30 of the heating system 1. The heated heat exchange medium flows to the power plant boiler power generation subsystem 40, and the heat of the heat exchange medium is used in the power generation process in the power plant boiler power generation subsystem 40.

[0044] In the actual production process, the distance between the setting position of the calcium-based particle tower heat absorption subsystem 20 and the setting position of the power plant calcium-based particle heat release subsystem 30 is relatively far. The setting of the first pipeline 50 and the second pipeline 60 facilitates the long-distance energy transmission process between the calcium-based particle tower heat absorption subsystem 20 and the power plant calcium-based particle heat release subsystem 30, so that the power generation process in the power plant boiler power generation subsystem 40 can be set near the actual power load center, thereby reducing the power transmission cost of the power plant boiler power generation subsystem 40.

[0045] In the above manner, the first and second pipes 50 and 60 are connected between the calcium-based particle tower heat absorption subsystem 20 and the power plant calcium-based particle heat release subsystem 30, isolating the heat absorption and heat release processes at the solar power station. The calcium-based particles input through the second pipe 60 are heated to a high temperature and converted in the heat absorber 22. They are then transferred through the first pipe 50 to the second heat exchanger 31, where they release heat and are converted again, forming a cycle that facilitates power generation or heat supply. The first heat exchanger 24 is positioned between the heat absorber 22 and the second heat exchanger 31 to improve the efficiency of heat absorption and heat release. Furthermore, the calcium-based particles, acting as a transmission and storage medium for thermal energy, can effectively collect solar energy and convert it into usable thermal energy, thereby improving heating efficiency.

[0046] Specifically, the calcium-based particles in the first pipe 50 are CaO, and the calcium-based particles in the second pipe 60 are CaCO3.

[0047] In the above manner, the calcium-based particles in the second pipe 60 and the calcium-based particles in the first pipe 50 can be converted into each other through chemical reactions (ie, endothermic reactions and exothermic reactions), so as to facilitate the collection of solar energy and heat supply.

[0048] <Heat absorber 22>

[0049] like Figure 1 As shown, the heat absorber 22 receives CaCO3 from the second pipe 60, absorbs heat to generate CaO, and flows into the first pipe 50. The chemical equation of the endothermic reaction of the calcium-based particles is:

[0050] CaCO3=CaO+CO2。

[0051] In the above manner, the CaCO3 in the second pipe 60 can undergo an endothermic reaction at the absorber 22 and be converted into CaO and flow into the first pipe 50, so that the heat energy required for the endothermic reaction can be obtained from solar energy, which facilitates the rational use of solar energy.

[0052] <First Heat Exchanger 24>

[0053] like Figure 1 As shown, the first pipe 50 flows through the first heat exchanger 24 to form a first inlet and a first outlet, and the second pipe 60 flows through the first heat exchanger 24 to form a second inlet and a second outlet. The CaO flowing into the first heat exchanger 24 through the first inlet and the CaCO3 flowing into the first heat exchanger 24 through the second inlet exchange heat with each other and then flow out from the first outlet and the second outlet respectively.

[0054] In the above manner, the calcium-based particles in the first pipe 50 and the calcium-based particles in the second pipe 60 can exchange heat at the first heat exchanger 24. The first heat exchanger 24 serves as a transfer space for the heat exchange medium. No chemical reaction occurs in the first heat exchanger 24 and the type of the calcium-based particles does not change. This facilitates cooling the calcium-based particles in the first pipe 50 and heating the calcium-based particles in the second pipe 60, which facilitates subsequent chemical reactions (i.e., endothermic reactions and exothermic reactions) among the calcium-based particles.

[0055] <Second Heat Exchanger 31>

[0056] like Figure 1 As shown, the second heat exchanger 31 receives CaO from the first pipe 50, and after releasing heat, generates CaCO3 which flows into the second pipe 60. The chemical equation of the exothermic reaction of calcium-based particles is:

[0057] CaO+H2O=Ca(OH)2, Ca(OH)2+CO2=CaCO3+H2O.

[0058] In the above manner, the CaO in the first pipe 50 can undergo an exothermic reaction in the second heat exchanger 31 and be converted into CaCO3 and flow into the second pipe 60, so that the heat energy generated by the exothermic reaction can be used for heating.

[0059] <First Pipe 50, Second Pipe 60>

[0060] like Figure 1 As shown, the first pipe 50 and / or the second pipe 60 is provided with a corner, which is located between the first heat exchanger 24 and the second heat exchanger 31 , and the position of the corner is higher than the positions of the two end portions of the first pipe 50 and / or the second pipe 60 .

[0061] The first conduit 50 / second conduit 60 has at least one elevated corner along the conveying path, with the corner's apex positioned higher than the connection openings at either end of the first conduit 50 / second conduit 60. The corner can be located in the middle of the first conduit 50 / second conduit 60, meaning the two conduits have an overall structure with a higher center and lower ends, with a certain height difference between the middle and the ends. In some embodiments, the first conduit 50 / second conduit 60 has an overall structure such as an inverted V-shape, an arched shape, or an inverted U-shape.

[0062] Therefore, the structural design of the high-position corner on the first pipe 50 / second pipe 60 can ensure that the calcium-based particles flow smoothly to the first heat exchanger 24 and the second heat exchanger 31 connected at both ends of the pipe under the action of gravity, reducing the accumulation of calcium-based particles inside the pipe, thereby avoiding pipe blockage caused by local deposition of calcium-based particles, and ensuring the continuous energy supply of the heating system 1. When the heating system 1 needs to be repaired or shut down in an emergency, a reasonable corner structure and slope design can achieve natural backflow and emptying of the calcium-based particles in the pipe, which is conducive to rapid discharge and improves the operational reliability and maintainability of the heating system 1. The corner structure can also be used to guide the flow direction of the calcium-based particles, avoid turbulence, vortexes and other adverse flow phenomena of the calcium-based particles in the pipe, and improve the overall heat transfer efficiency.

[0063] In some embodiments, a small amount of gas may be generated during the startup or operation of the heating system 1. Setting a high-position corner can be used as an automatic exhaust point. For example, an exhaust valve is set at the corner of the first pipe 50 / the second pipe 60. The gas can naturally rise and gather at the corner and be discharged from the pipe through the exhaust valve, avoiding gas accumulation causing problems such as gas blockage, poor flow or local overheating, thereby ensuring the operational reliability and safety of the heating system 1.

[0064] According to some embodiments of the present invention, Figure 1 As shown, the turning angle is α, where α satisfies: 0.5°≤α≤5°.

[0065] By limiting the range of the corner and setting the corner to an obtuse angle, the flow resistance of the calcium-based particles at the corner can be significantly reduced, the local pressure loss and the generation of turbulence can be reduced, and the overall thermal efficiency of the heating system 1 can be improved. If the corner is too small, it is easy to cause the local flow velocity of the calcium-based particles to drop, deposit or even clog. A larger corner design helps to maintain the continuity and uniformity of the flow of calcium-based particles and reduce dead zones and retention. If the corner is too large, it is easy to cause the height difference between the corner and the end of the pipeline to be too small, resulting in a decrease in the flow velocity of the calcium-based particles in the pipeline to the two ends of the pipeline. Preferably, α = 3°.

[0066] Therefore, by limiting the range of the corner, the smooth flow of calcium-based particles in the first pipe 50 / the second pipe 60 can be ensured, blocking can be prevented, and the operational stability, reliability and maintainability of the heating system 1 can be improved.

[0067] <High temperature calcium-based granular storage tank 23>

[0068] like Figure 1 As shown, the calcium-based particle tower heat absorption subsystem 20 further includes a high-temperature calcium-based particle storage tank 23 , which is disposed on the first pipe 50 and between the heat absorber 22 and the first heat exchanger 24 .

[0069] Through the above method, the high-temperature calcium-based particles (i.e., high-temperature CaO particles) output by the heat absorber 22 are placed in the high-temperature calcium-based particle storage tank 23 for temporary storage as a buffer node to prevent pressure shock caused by sudden changes in the flow of the first pipeline 50 and improve the flexibility of calcium-based particle scheduling.

[0070] <Low temperature calcium-based granular storage tank 32>

[0071] like Figure 1 As shown, the power plant calcium-based particle heat release subsystem 30 further includes a low-temperature calcium-based particle storage tank 32 . The low-temperature calcium-based particle storage tank 32 is provided on the first pipeline 50 and between the first heat exchanger 24 and the second heat exchanger 31 .

[0072] Through the above method, the low-temperature calcium-based particles (i.e., low-temperature CaO particles) output by the first heat exchanger 24 are placed in the low-temperature calcium-based particle storage tank 32 for temporary storage as a buffer node to prevent pressure shock caused by sudden changes in the flow of the first pipeline 50, while providing a circulation basis for the subsequent heat exchange side of the second heat exchanger 31.

[0073] Thus, by arranging a plurality of calcium-based particle storage tanks (such as Figure 1 The high-temperature calcium-based particle storage tank 23 and the low-temperature calcium-based particle storage tank 32 in the heat supply system 1 can realize the hierarchical storage and flexible scheduling of calcium-based particles of different temperatures, thereby enhancing the energy storage capacity and operational stability of the entire heating system 1. The provision of multiple calcium-based particle storage tanks can also improve the heat exchange efficiency and operational stability of the heating system 1, build a sustainable thermal system architecture, and achieve efficient, stable and sustainable energy supply. At the same time, multiple calcium-based particle storage tanks can also enable the heating system 1 to adjust the calcium-based particle distribution strategy between each calcium-based particle storage tank according to load demand, thereby improving the flexibility of the heating system 1 and effectively improving energy utilization efficiency.

[0074] <Power Generation System 100>

[0075] Continue to refer Figure 1 In a second aspect, the present invention provides a power generation system 100 (hereinafter referred to as power generation system 100 ) coupling a solar thermal calcium-based particle power station with a coal-fired power unit, comprising the above-mentioned heating system 1 .

[0076] In the above manner, the heating system 1, as the heat energy input subsystem of the power generation system 100, can provide a stable high-temperature heat source for the power generation process of the power generation system 100. The calcium-based particles complete the processes of heat absorption, storage, heat exchange and reflux in the heating system 1, realizing a closed-loop operation of the entire process from solar energy collection, heat energy storage, thermoelectric conversion to power output, effectively improving the energy utilization efficiency of the power generation system 100 and improving the operating stability of the power generation system 100.

[0077] like Figure 1As shown, the power generation system 100 also includes a mirror field subsystem 10 and a power plant boiler power generation subsystem 40. The calcium-based particle tower heat absorption subsystem 20 is coupled to the mirror field subsystem 10, and the mirror field subsystem 10 is connected to the heat absorber 22 of the heating system 1. The mirror field subsystem 10 is used to reflect sunlight and transfer heat to the heat absorber 22. The power plant calcium-based particle heat release subsystem 30 is arranged in the power plant boiler power generation subsystem 40. The power plant boiler power generation subsystem 40 is located downstream of the power plant calcium-based particle heat release subsystem 30 of the heating system 1. The heat exchange medium is suitable for flowing through the second heat exchanger 31 of the power plant calcium-based particle heat release subsystem 30 for heat exchange and then flowing to the power plant boiler power generation subsystem 40.

[0078] Specifically, the mirror field subsystem 10 consists of multiple heliostats 11. Heliostats 11 track the sun's position in real time, reflecting and focusing sunlight onto a heat absorber 22 at the top of a heat absorption tower 21. The heat focused onto heat absorber 22 is used to heat low-temperature calcium-based granules flowing through it to a high temperature. The calcium-based granule tower heat absorption subsystem 20 includes the heat absorption tower 21, the heat absorber 22, a high-temperature calcium-based granule storage tank 23, and a first heat exchanger 24. The high-temperature calcium-based granules heated by the heat absorber 22 (including sensible heat and chemical heat) are stored in the high-temperature calcium-based granule storage tank 23. The high-temperature calcium-based granules in the high-temperature calcium-based granule storage tank 23 are then heat-exchanged via the first heat exchanger 24 to form low-temperature calcium-based granules (releasing sensible heat, including only chemical heat). These granules are then transported via a first pipeline 50 to the low-temperature calcium-based granule storage tank 32 in the power plant's calcium-based granule heat release subsystem 30.

[0079] The power plant's calcium-based pellet heat release subsystem 30 includes a low-temperature calcium-based pellet storage tank 32 and a second heat exchanger 31. The second heat exchanger 31 is connected to the power plant's boiler power generation subsystem 40. The low-temperature calcium-based pellets in the low-temperature calcium-based pellet storage tank 32 flow into the second heat exchanger 31. The power plant's boiler power generation subsystem 40 delivers a low-temperature heat exchange medium to the second heat exchanger 31. The low-temperature calcium-based pellets (containing only chemical heat) and the low-temperature heat exchange medium complete heat exchange in the second heat exchanger 31. The low-temperature calcium-based pellets (releasing chemical heat) are then transferred from the second heat exchanger 31 to the first heat exchanger 24. After absorbing heat, the heat exchange medium increases in temperature and flows back to the power plant's boiler power generation subsystem 40. In some embodiments, the heat exchange medium is water. Liquid water is heated in the second heat exchanger 31 to become high-temperature steam. The high-temperature steam is then transferred to the power plant's boiler power generation subsystem 40, where it provides heat to the generator, enabling it to generate electricity. After releasing heat, the steam flows through a condenser and cools to liquid water. The condensed water then returns to the second heat exchanger 31 to continue absorbing heat, forming a heat absorption and release cycle for the heat exchange medium. The low-temperature calcium-based particles in the first heat exchanger 24 are returned to the heat absorber 22 via a second pipe 60, completing one cycle of the calcium-based particles through the entire circulation loop.

[0080] Through the above method, through the organic integration of the mirror field subsystem 10, the calcium-based particle tower heat absorption subsystem 20, the power plant calcium-based particle heat release subsystem 30 and the power plant boiler power generation subsystem 40, efficient conversion and stable operation of the entire process from solar energy collection, thermal energy storage, thermoelectric conversion to power output are achieved.

[0081] The working process of the heating system 1 in the embodiment of the present invention is described below.

[0082] The mirror field subsystem 10 focuses sunlight onto the heat absorber 22 at the top of the heat absorption tower 21. The 450°C CaCO3 particles are heated in the heat absorber 22, rising to 800°C. They simultaneously decompose into high-temperature CaO particles, storing heat in the high-temperature CaO particles as chemical heat and sensible heat. The high-temperature CaO particles then flow out of the heat absorber 22 and into the high-temperature calcium-based particle storage tank 23. They then enter the first heat exchanger 24, exchanging heat with low-temperature CaCO3 particles (approximately 100°C) returning from the power plant's calcium-based particle heat release subsystem 30 via the second pipe 60. The low-temperature CaCO3 particles are heated to approximately 450°C. During this heat exchange process, the high-temperature CaO particles, in an N2 or air atmosphere, release only sensible heat, decreasing in temperature from 800°C to approximately 150°C, while still retaining chemical heat. In a first pipeline 50 (e.g., 11 km), compressed air is used to transport 150-degree low-temperature CaO particles to the low-temperature calcium-based particle storage tank 32 of the power plant's calcium-based particle heat release subsystem 30. The low-temperature CaO particles flow from the low-temperature calcium-based particle storage tank 32 to the second heat exchanger 31, where they exchange heat with water (heat exchange medium), heating the water into high-temperature steam (approximately 610 degrees). This steam can be combined with the main steam generated by the boiler in the power plant's boiler power generation subsystem 40 and enter the high-pressure cylinder for power generation (not shown, equivalent to the superheater); it can also be combined with the steam flowing out of the high-pressure cylinder and enter the intermediate-pressure cylinder as reheated steam for power generation (not shown, equivalent to the reheater).

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating system, characterized in that: include: A calcium-based particle tower heat absorption subsystem, wherein the calcium-based particle tower heat absorption subsystem comprises a heat absorber and a first heat exchanger; A power plant calcium-based particle heat release subsystem, wherein the power plant calcium-based particle heat release subsystem includes a second heat exchanger; a first pipeline, wherein the first pipeline sequentially connects the heat absorber, the first heat exchanger, and the second heat exchanger; A second pipeline, wherein the second pipeline sequentially connects the second heat exchanger, the first heat exchanger and the heat absorber, the flow direction of the calcium-based particles in the first pipeline is opposite to the flow direction of the calcium-based particles in the second pipeline and forms a circulation flow path, and the calcium-based particles in the first pipeline are different from the calcium-based particles in the second pipeline.

2. The heating system according to claim 1, characterized in that The calcium-based particles in the first pipe are CaO, and the calcium-based particles in the second pipe are CaCO3.

3. The heating system according to claim 2, characterized in that The heat absorber receives CaCO3 from the second pipe, absorbs heat to generate CaO, and flows into the first pipe. The chemical equation of the endothermic reaction of the calcium-based particles is: CaCO3=CaO+CO2。 4. The heating system according to claim 2 or 3, characterized in that: The second heat exchanger receives CaO from the first pipe, releases heat to generate CaCO3, and flows into the second pipe. The chemical equation of the exothermic reaction of calcium-based particles is: CaO+CO2=CaCO3.

5. The heating system according to claim 2, characterized in that: The first pipe flows through the first heat exchanger to form a first inlet and a first outlet, and the second pipe flows through the first heat exchanger to form a second inlet and a second outlet. The CaO flowing into the first heat exchanger through the first inlet and the CaCO3 flowing into the first heat exchanger through the second inlet exchange heat with each other and then flow out from the first outlet and the second outlet respectively.

6. The heating system according to claim 1, characterized in that The calcium-based particle tower heat absorption subsystem further includes a high-temperature calcium-based particle storage tank, which is provided on the first pipeline and between the heat absorber and the first heat exchanger.

7. The heating system according to claim 1 or 6, characterized in that: The power plant calcium-based particle heat release subsystem further includes a low-temperature calcium-based particle storage tank, which is provided on the first pipeline and between the first heat exchanger and the second heat exchanger.

8. The heating system according to claim 1, characterized in that The first pipe and / or the second pipe is provided with a corner, the corner is located between the first heat exchanger and the second heat exchanger, and the position of the corner is higher than the positions of both ends of the first pipe and / or the second pipe.

9. A power generation system that couples a solar thermal calcium-based particle power station with a coal-fired power unit, characterized in that: The invention comprises a heating system according to any one of claims 1 to 8.

10. The power generation system of the solar thermal calcium-based particle power station coupled with the coal-fired power unit according to claim 9 is characterized in that: Also includes: A mirror field subsystem, the calcium-based particle tower heat absorption subsystem is coupled to the mirror field subsystem, and the mirror field subsystem is used to reflect sunlight and transfer heat to the heat absorber; The power plant boiler power generation subsystem, the power plant calcium-based particle heat release subsystem is arranged in the power plant boiler power generation subsystem, the power plant boiler power generation subsystem is located downstream of the power plant calcium-based particle heat release subsystem of the heating system, and the heat exchange medium is suitable for flowing through the second heat exchanger of the power plant calcium-based particle heat release subsystem and then flowing to the power plant boiler power generation subsystem.

Images