Carbon dioxide treatment system based on concentrated photovoltaic power generation

Abstract

The present invention provides a carbon dioxide treatment system based on concentrated photovoltaic power generation, which uses the waste heat of the concentrated photovoltaic thermal collection module to provide heat for the carbon capture module to achieve carbon dioxide capture. At the same time, since the heat of the photovoltaic thermal unit is taken away, the temperature is reduced. From the temperature effect, it can be seen that the efficiency of photovoltaic power generation is improved, which can achieve the triple effects of low carbon emissions, improved solar energy utilization efficiency, and energy saving.

Description

Technical Field

[0001] The invention relates to the technical field of solar thermal utilization, and in particular to a carbon dioxide processing system based on concentrated photovoltaic power generation. Background Art

[0002] Excessive carbon dioxide emissions are one of the main causes of the greenhouse effect. Among the large carbon dioxide emission sources, thermal power plants that use fossil fuels as their main energy source are the largest fixed carbon dioxide emission source, accounting for more than 60% of my country's carbon emissions. Therefore, in response to the country's goal of achieving carbon peak and carbon neutrality, it is urgent to carry out carbon capture transformation of existing coal-fired power plants and study how to effectively use renewable energy to replace traditional fossil energy.

[0003] At present, among carbon dioxide capture technologies, the most widely used carbon dioxide absorption method is the amine method (MEA method) in the chemical absorption technology, and this technology has been used in coal-fired power plants. However, for this technology, due to the strong binding ability of MEA with carbon dioxide, the required regenerative heat consumption is large, and the heat source of the existing technology is mostly steam in the turbine.

[0004] Due to its wide distribution and large reserves, solar energy has become the most widely studied renewable energy. Therefore, some scholars have proposed combining solar thermal collection technology with carbon dioxide capture technology. With the emergence and development of concentrated photovoltaic power generation technology, the photoelectric efficiency has been improved, but there is a higher heat flux density in smaller photovoltaic chips. Therefore, the concept of "photovoltaic-photothermal integrated utilization" has appeared in people's vision. Summary of the invention

[0005] The object of the present invention is to provide a carbon dioxide treatment system based on concentrated photovoltaic power generation, which can utilize the waste heat of a concentrated photovoltaic heat collection module to provide heat for a carbon capture module.

[0006] In order to achieve the above object, the present invention provides a carbon dioxide treatment system based on concentrated photovoltaic power generation, comprising:

[0007] A flue gas generating module, for providing flue gas containing carbon dioxide;

[0008] The carbon capture module comprises an absorption tower, a desorption tower, a mixer, a lean-rich liquid heat exchanger, a cooler and a reboiler, wherein the absorption tower is connected to the flue gas generation module and the mixer, and the flue gas generation module and the mixer respectively introduce the flue gas and the MEA absorbent to the bottom and the top of the absorption tower, and the MEA absorbent absorbs the carbon dioxide in the flue gas and forms a cold rich liquid, and the lean-rich liquid heat exchanger is connected to the bottom of the absorption tower and the top and the bottom of the desorption tower, and the absorption tower and the desorption tower respectively introduce the cold rich liquid and the hot lean liquid to the lean-rich liquid heat exchanger. , the cold rich liquid and the hot lean liquid are heat-exchanged in the lean-rich liquid heat exchanger and become hot rich liquid and cold lean liquid respectively, the hot rich liquid in the lean-rich liquid heat exchanger is returned to the top of the desorption tower, the reboiler heats the hot lean liquid in the desorption tower to generate steam, so as to desorb the carbon dioxide in the hot rich liquid in the desorption tower to form hot lean liquid, the lean-rich liquid heat exchanger is connected to the mixer through the cooler, the hot lean liquid in the lean-rich liquid heat exchanger is cooled by the cooler to form cold lean liquid and is provided to the mixer to supplement the MEA absorbent and water in the mixer;

[0009] A concentrated photovoltaic thermal collection module includes multiple photovoltaic thermal units and an oil tank. The inlets of the multiple photovoltaic thermal units are connected to the reboiler, and the outlets of the multiple photovoltaic thermal units are connected to the reboiler through the oil tank. The photovoltaic thermal units heat the heat transfer oil and then pass it into the oil tank. The oil tank provides the heat transfer oil to the reboiler to provide heat for the reboiler, so that the reboiler generates steam.

[0010] Optionally, the flue gas generating module is a coal-fired boiler in a coal-fired power plant, the coal-fired boiler is connected to a generator via a steam turbine, the coal-fired boiler generates steam by burning coal and drives the steam turbine to work, so that the generator generates electricity, and the coal-fired boiler generates the flue gas.

[0011] Optionally, the steam outlet and the steam inlet of the steam turbine are both connected to the reboiler, and the steam turbine provides the generated steam to the reboiler to provide heat for the reboiler.

[0012] Optionally, after the MEA absorbent absorbs the carbon dioxide in the flue gas, the remaining flue gas is discharged through the top outlet of the absorption tower; the carbon capture module also includes an outlet cooler connected to the top outlet of the desorption tower, which is used to cool the carbon dioxide desorbed from the hot rich liquid in the desorption tower and then discharge it.

[0013] Optionally, also include:

[0014] The preheating water module includes a hot water storage tank and an oil-water heat exchanger. The oil-water heat exchanger is located between the inlet of the plurality of photovoltaic thermal units and the reboiler and is used for exchanging heat with the heat transfer oil. The hot water storage tank is connected to the oil-water heat exchanger, the outlet cooler and the cooler and is used for providing cooling water to the oil-water heat exchanger, the outlet cooler and the cooler and temporarily storing the cooling water after absorbing heat.

[0015] Optionally, the heat storage tank is connected to the coal-fired boiler to provide preheated cooling water to the coal-fired boiler.

[0016] Optionally, a rich liquid pump is connected between the lean-rich liquid heat exchanger and the bottom of the absorption tower, and a lean liquid pump is connected between the lean-rich liquid heat exchanger and the bottom of the desorption tower.

[0017] The carbon dioxide treatment system based on concentrated photovoltaic power generation provided by the present invention has the following beneficial effects:

[0018] 1) The waste heat of the concentrated photovoltaic collector module is used to provide heat for the carbon capture module to achieve carbon dioxide capture. At the same time, as the heat of the photovoltaic thermal unit is taken away, the temperature is reduced. From the temperature effect, it can be seen that the efficiency of photovoltaic power generation is improved, which can achieve the triple effects of low carbon emissions, improved solar energy utilization efficiency, and energy saving.

[0019] 2) Combine concentrated photovoltaic thermal modules with coal-fired power plants to fully utilize the waste heat in the photovoltaic thermal unit with the same heat consumption as the regenerative heat consumption in the carbon capture system to provide energy for carbon capture and achieve low carbon emissions from coal-fired power plants;

[0020] 3) At night, the steam from the steam turbine can be used to power the carbon capture module, reducing the irreversible losses caused by the traditional method of using a large amount of steam after cooling and pressure reduction, resulting in high-grade energy waste;

[0021] 4) The preheating water module can recycle low-grade heat in the entire system, improve the energy efficiency of the system, and save coal consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a carbon dioxide treatment system based on concentrated photovoltaic power generation provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of a concentrated photovoltaic heat collection module provided by an embodiment of the present invention;

[0024] Wherein, the accompanying drawings are marked as follows:

[0025] 1—boiler, 2—steam turbine, 3—generator, 4—absorption tower, 5—desorption tower, 6—lean and rich liquid heat exchanger, 7—rich liquid pump, 8—lean liquid pump, 9—mixer, 10—cooler, 11—outlet cooler, 12—reboiler, 13—photovoltaic thermal unit, 14—oil-water heat exchanger, 15—heat storage tank, 16—inlet pump, 17—outlet pump, 18—oil tank, 19—concentrating photovoltaic collector module. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer based on the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of a carbon dioxide treatment system based on concentrated photovoltaic power generation provided in this embodiment. Figure 2 This is a schematic diagram of the structure of the concentrated photovoltaic heat collection module provided in this embodiment. Figure 1 and Figure 2 As shown, the carbon dioxide treatment system based on concentrated photovoltaic power generation includes a flue gas generation module, a concentrated photovoltaic heat collection module 19 and a preheating water module.

[0028] Specifically, the flue gas generating module is used to provide flue gas containing carbon dioxide. In this embodiment, the flue gas generating module is a coal-fired boiler 1 in a coal-fired power plant, the coal-fired boiler 1 is connected to a generator 3 via a steam turbine 2, the coal-fired boiler 1 generates steam by burning coal and drives the steam turbine 2 to work, so that the generator 3 generates electricity, and the coal-fired boiler 1 generates the flue gas.

[0029] The carbon capture module is used to capture carbon dioxide in the flue gas. In this embodiment, the carbon capture module includes an absorption tower 4, a desorption tower 5, a mixer 9, a lean and rich liquid heat exchanger 6, a cooler 10, a reboiler 12, an outlet cooler 11, a rich liquid pump 7 and a lean liquid pump 8.

[0030] The absorption tower 4 is connected to the coal-fired boiler 1 (specifically, to the exhaust gas outlet of the coal-fired boiler 1) and the mixer 9, and the flue gas generation module can pass the generated flue gas into the bottom of the absorption tower 4, while the mixer 9 passes the MEA absorbent to the top of the absorption tower 4. After the MEA absorbent contacts the flue gas, the MEA absorbent can absorb the carbon dioxide in the flue gas and form a cold rich liquid (flowing to the bottom of the absorption tower 4), and after the carbon dioxide in the flue gas is absorbed by the MEA absorbent, the remaining flue gas is discharged through the top outlet of the absorption tower.

[0031] The bottom of the absorption tower 4 is connected to the lean-rich liquid heat exchanger 6 through the rich liquid pump 7, the top of the desorption tower 5 is connected to the lean-rich liquid heat exchanger 6, and the bottom of the desorption tower 5 is connected to the lean-rich liquid heat exchanger 6 through the lean liquid pump 8. The rich liquid pump 7 can pump the cold rich liquid at the bottom of the absorption tower 4 into the lean-rich liquid heat exchanger 6, and at the same time, the lean liquid pump 8 can pump the hot lean liquid at the bottom of the desorption tower 5 into the lean-rich liquid heat exchanger 6. The cold rich liquid and the hot lean liquid exchange heat in the lean-rich liquid heat exchanger 6, the cold rich liquid absorbs heat to form hot rich liquid, and the hot lean liquid releases heat to form cold lean liquid (flowing to the bottom of the desorption tower 5).

[0032] Furthermore, the hot rich liquid in the lean-rich liquid heat exchanger 6 will return to the top of the desorption tower 5, and the reboiler 12 will heat the hot lean liquid in the bottom of the desorption tower 5 to generate steam, and the steam will contact the hot rich liquid in the desorption tower 5, thereby desorbing carbon dioxide from the hot rich liquid in the desorption tower 5, and the hot rich liquid will form hot lean liquid again (the hot lean liquid enters the lean-rich liquid heat exchanger 6 for circulation). The top outlet of the desorption tower 5 is connected to an outlet cooler 11, and the carbon dioxide in the desorption tower 5 is cooled by the outlet cooler 11 and then discharged.

[0033] Furthermore, the lean-rich liquid heat exchanger 6 is connected to the mixer 9 via the cooler 10, and the cold lean liquid in the lean-rich liquid heat exchanger 6 is cooled by the cooler 10 to form cold lean liquid. The cooler 10 passes the cold lean liquid into the mixer 9, and the cold lean liquid can supplement the MEA absorbent and water in the mixer 9.

[0034] The concentrated photovoltaic heat collection module 19 includes a plurality of photovoltaic thermal units 13 and an oil tank 18. The inlets of the plurality of photovoltaic thermal units 13 are all connected to the reboiler 12, and the outlets of the plurality of photovoltaic thermal units 13 are connected to the reboiler 12 through the oil tank 18. The photovoltaic thermal unit 13 heats the heat transfer oil and then passes it into the oil tank 18. The oil tank 18 in turn provides the heated heat transfer oil to the reboiler 12 to provide heat to the reboiler 12, so that the reboiler 12 heats the hot lean liquid in the bottom of the desorption tower 5 to generate steam. After the heat transfer oil passes through the reboiler 12 and releases heat, it returns to the plurality of photovoltaic thermal units 13 for reheating, forming a cycle.

[0035] In this embodiment, an inlet pump 16 is connected between the inlets of the multiple photovoltaic thermal units 13 and the reboiler 12, and an outlet pump 17 is connected between the outlets of the multiple photovoltaic thermal units 13 and the reboiler 12. The inlet pump 16 and the outlet pump 17 can speed up the circulation of the heat transfer oil.

[0036] Optionally, the photovoltaic thermal unit 13 can be an existing photovoltaic thermal system, for example, it can be composed of structures such as Fresnel lens, secondary prism, photovoltaic chip, PCB board, collector, etc. The photovoltaic thermal unit 13 can be arranged in a point type, a line type, or an array type. The heat transfer oil enters each photovoltaic thermal unit 13 under the action of the inlet pump 16. Under the action of the Fresnel lens, the solar energy flow density is increased and converged on the photovoltaic chip. The heat is collected by the heat transfer oil under the action of the collector, and enters the oil tank 18 under the action of the outlet pump 17, and then provided to the reboiler 12 by the oil tank 18.

[0037] It can be understood that sunlight with a wavelength that matches the band gap energy of the photovoltaic chip can be converted into electrical energy, and the generated electricity can be input into the power grid. Only the heat that cannot be converted into electrical energy will be collected by the heat transfer oil under the action of the collector.

[0038] Furthermore, the oil tank 18 can adjust the operating pressure of the heat transfer oil. To ensure the uniformity of the heating efficiency of each photovoltaic thermal unit 13, the pipelines of the concentrated photovoltaic thermal collection module 19 can be arranged in the same manner.

[0039] In this embodiment, the steam outlet and steam inlet of the steam turbine 2 are both connected to the reboiler 12, and the steam turbine 2 provides the generated steam to the reboiler 12 to provide heat to the reboiler 12, so that the reboiler 12 heats the hot lean liquid in the bottom of the desorption tower 5 to generate steam, and after the steam releases heat, it returns to the steam turbine 2 to form a cycle. Considering that the desorption temperature of the MEA absorbent exceeds 125°C, it will degrade and corrode the equipment, and the heat exchange temperature difference of the reboiler 12 is 10°C, so the maximum working medium temperature for heating the reboiler 12 should be 135°C. Since the steam outlet and steam inlet of the steam turbine 2 are fixed, the temperature of the steam generated by the steam turbine 2 may be too high, so the steam generated by the steam turbine 2 can be cooled and decompressed and provided to the reboiler 12 to supply energy to the reboiler 12.

[0040] It can be seen that in this embodiment, the heat required by the reboiler 12 can be supplied by the photovoltaic waste heat collected by the concentrating photovoltaic collector module 19 during the day, and under the action of the concentrating photovoltaic collector module 19, the photovoltaic power generation efficiency is improved; at night, the heat required by the reboiler 12 can be provided by the steam in the turbine 2 to ensure continuous operation of the system.

[0041] The preheating water module includes an oil-water heat exchanger 14 and a hot water storage tank 15. The oil-water heat exchanger 14 is located between the inlet of the plurality of photovoltaic thermal units 13 and the reboiler 12. The hot water storage tank 15 is connected to the oil-water heat exchanger 14, the cooler 10 and the outlet cooler 11. The cooling water enters the oil-water heat exchanger 14, the cooler 10 and the outlet cooler 11 to take away the heat load, so that the system operates normally. The heated cooling water is collected in the hot water storage tank 15 for short-term storage.

[0042] It should be noted that the hot water storage tank 15 is connected to the oil-water heat exchanger 14, the cooler 10 and the outlet cooler 11 in a circulation mode. Taking the oil-water heat exchanger 14 as an example, the hot water storage tank 15 is connected to the oil-water heat exchanger 14 in a circulation mode, so that the cooling water in the hot water storage tank 15 can enter the oil-water heat exchanger 14 and exchange heat with the heat transfer oil. After the heat exchange, the cooling water absorbs heat, the temperature rises, and returns to the hot water storage tank 15 for temporary storage.

[0043] Optionally, the hot water storage tank 15 may be connected to the coal-fired boiler 1 to supply preheated water to the coal-fired boiler 1 .

[0044] It can be seen that when the system is running, the cooler 10 and the outlet cooler 11 will generate a large amount of heat load. The preheating water module can provide cooling water to recover the heat load in the cooler 10 and the outlet cooler 11, and there is still available space for the heat carried by the heat transfer oil. Therefore, the heat is recovered through the oil-water heat exchanger 14 to save power consumption.

[0045] In this embodiment, when the coal-fired power plant 1 is in operation, the flue gas discharged can be pre-treated to remove most impurities such as sulfide, and enter the carbon capture module. Under the action of the MEA absorbent in the absorption tower 4, carbon dioxide undergoes an adsorption and desorption process. In this process, the heat transfer oil in the concentrated photovoltaic heat collection module 19 is heated by the photovoltaic waste heat under the action of the collector, and the temperature rises, and then enters the reboiler 12 to provide heat for the reboiler 12. At the same time, the heat in the photovoltaic thermal unit 13 is taken away, and the photovoltaic power generation efficiency is improved. At night, the carbon capture module can extract steam from the steam turbine 2 to cool and reduce the pressure to provide heat for the reboiler 12. When the entire system is in operation, the cooler 10 and the outlet cooler 11 will generate a large amount of heat load, and there is still available space for the heat carried by the heat transfer oil. Under the action of the oil-water heat exchanger 14, this heat is collected by cooling water and provided to the coal-fired boiler 1. When the coal-fired boiler 1 has sufficient water supply, the hot water storage tank 15 can temporarily store the preheated cooling water.

[0046] For the carbon capture module, the amount of carbon dioxide captured by the carbon capture module can be adjusted by changing the supply amount of the MEA absorbent, or by changing the heat load of the reboiler 12. If the amount of carbon dioxide captured is to be increased, the supply amount of the MEA absorbent needs to be increased, and vice versa, the supply amount of the MEA absorbent needs to be reduced. As for adjusting the heat load of the reboiler 12, if the amount of carbon dioxide captured needs to be reduced, the heat load of the reboiler 12 needs to be reduced, such as reducing the flow rate of the heat transfer oil, which can reduce the heat supplied and reduce the reaction rate; if the amount of carbon dioxide captured needs to be increased, the heat load of the reboiler 12 needs to be increased, and the flow rate of the heat transfer oil can be increased. The flow rate of the heat transfer oil entering the reboiler 12 increases, and the heat transferred also increases accordingly.

[0047] For the concentrated photovoltaic heat collection module 19, only directly irradiated solar energy can be effectively utilized, so high-precision sunlight tracking is an important component. For point-focusing concentrators, in order to ensure that solar radiation is effectively focused on the photovoltaic chip, a dual-axis tracking heliostat system is required to ensure the maximum working efficiency of the point-focusing concentrator. This embodiment adopts the most commonly used coaxial tracking system in the dual-axis tracking heliostat system, which uses the rotation of the common roller of the concentrator and the independent tilt axis of each concentrator to adjust the angle to achieve solar tracking, providing more favorable guarantees for the efficient operation of the heat collection system. The heat in the system that cannot be converted into electrical energy is effectively collected by the heat transfer oil under the action of the collector.

[0048] At night, the concentrated photovoltaic heat collection module 19 stops working, and the heat required by the reboiler 12 comes from the high-temperature and high-pressure steam extracted from the steam turbine 2. The steam can meet the temperature and pressure requirements of the reboiler 12 after being reduced in pressure and temperature. When the solar radiation intensity is insufficient, the heat required by the reboiler 12 can also be obtained from the concentrated photovoltaic heat collection module 19 and the steam turbine 2 at the same time.

[0049] For the preheating water module, the cooling heat load during the operation of the carbon capture module and the excess heat of the thermal oil can be transferred to the cooling water. The heated cooling water can be introduced into the water-cooled wall in the coal-fired boiler 1 for further heating. When the amount of water required by the water-cooled wall is sufficient, it is stored in the heat storage tank for insulation.

[0050] In summary, in the carbon dioxide treatment system based on concentrated photovoltaic power generation provided in this embodiment, the waste heat of the concentrated photovoltaic heat collection module is used to provide heat for the carbon capture module to achieve carbon dioxide capture. At the same time, since the heat of the photovoltaic thermal unit is taken away, the temperature is reduced. From the temperature effect, it can be seen that the efficiency of photovoltaic power generation is improved, which can achieve the triple effects of low carbon emissions, improved solar energy utilization efficiency, and energy saving. The concentrated photovoltaic heat collection module is combined with a coal-fired power plant to fully utilize the heat in the waste heat of the photovoltaic thermal unit with the same quality as the regenerated heat consumption in the carbon capture system to provide energy for carbon capture and achieve low carbon emissions from the coal-fired power plant; at night, the steam in the steam turbine can be used to power the carbon capture module, reducing the irreversible losses caused by the traditional method of using a large amount of steam after cooling and pressure reduction, resulting in high-grade energy waste; the preheating water module can recycle the low-grade heat in the entire system, improve the energy efficiency of the system, and save coal consumption.

[0051] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0052] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0053] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0054] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not intended to limit the scope of the invention. It should be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have the definition of a logical "or", rather than a logical "exclusive or", unless the context clearly indicates otherwise. In addition, the implementation of the method and / or device in the embodiments of the present invention may include performing the selected task manually, automatically, or in combination.

Claims

1. A carbon dioxide treatment system based on concentrated photovoltaic power generation, characterized in that: include: A flue gas generating module, for providing flue gas containing carbon dioxide; The carbon capture module comprises an absorption tower (4), a desorption tower (5), a mixer (9), a lean-rich liquid heat exchanger (6), a cooler (10) and a reboiler (12), wherein the absorption tower (4) is connected to the flue gas generation module and the mixer (9), and the flue gas generation module and the mixer (9) respectively introduce the flue gas and the MEA absorbent into the bottom and the top of the absorption tower (4), wherein the MEA absorbent absorbs the carbon dioxide in the flue gas and forms a cold rich liquid, and the lean-rich liquid heat exchanger (6) is connected to the flue gas generation module and the mixer (9). The heat exchanger (6) is connected to the bottom of the absorption tower (4) and the top and bottom of the desorption tower (5). The absorption tower (4) and the desorption tower (5) respectively introduce cold rich liquid and hot lean liquid into the lean-rich liquid heat exchanger (6). The cold rich liquid and the hot lean liquid are heat-exchanged in the lean-rich liquid heat exchanger (6) and become hot rich liquid and cold lean liquid respectively. The hot rich liquid in the lean-rich liquid heat exchanger (6) is returned to the top of the desorption tower (5). The reboiler (12) transfers the hot lean liquid in the desorption tower (5) to the top of the desorption tower (5). The hot rich liquid in the desorption tower (5) is heated to generate steam to desorb carbon dioxide from the hot rich liquid to form hot lean liquid. The lean-rich liquid heat exchanger (6) is connected to the mixer (9) via the cooler (10). The hot lean liquid in the lean-rich liquid heat exchanger (6) is cooled by the cooler (10) to form cold lean liquid and is provided to the mixer (9) to replenish the MEA absorbent and water in the mixer (9); a concentrated photovoltaic heat collection module, comprising a plurality of photovoltaic thermal units (13) and an oil tank (18), wherein the inlets of the plurality of photovoltaic thermal units (13) are all connected to the reboiler (12), and the outlets of the plurality of photovoltaic thermal units (13) are connected to the reboiler (12) through the oil tank (18), the photovoltaic thermal units (13) heat the heat transfer oil and then pass it into the oil tank (18), and the oil tank (18) provides the heat transfer oil to the reboiler (12) to provide heat to the reboiler (12), so that the reboiler (12) generates steam; After the MEA absorbent absorbs the carbon dioxide in the flue gas, the remaining flue gas is discharged through the top outlet of the absorption tower (4); the carbon capture module also includes an outlet cooler (11), connected to the top outlet of the desorption tower (5), for cooling the carbon dioxide desorbed from the hot rich liquid in the desorption tower (5) and discharging it; It also includes: a preheating water module, including a hot water storage tank (15) and an oil-water heat exchanger (14), wherein the oil-water heat exchanger (14) is located between the inlets of the plurality of photovoltaic thermal units (13) and the reboiler (12), and is used for exchanging heat with the heat transfer oil; the hot water storage tank (15) is connected to the oil-water heat exchanger (14), the outlet cooler (11) and the cooler (10), and is used for providing cooling water to the oil-water heat exchanger (14), the outlet cooler (11) and the cooler (10), and temporarily storing the cooling water after absorbing heat.

2. The carbon dioxide treatment system based on concentrated photovoltaic power generation according to claim 1, characterized in that: The flue gas generating module is a coal-fired boiler (1) in a coal-fired power plant. The coal-fired boiler (1) is connected to a generator (3) via a steam turbine (2). The coal-fired boiler (1) generates steam by burning coal and drives the steam turbine (2) to work, so that the generator (3) generates electricity. The coal-fired boiler (1) generates the flue gas.

3. The carbon dioxide treatment system based on concentrated photovoltaic power generation according to claim 2, characterized in that: The steam outlet and the steam inlet of the steam turbine (2) are both connected to the reboiler (12), and the steam turbine (2) provides the generated steam to the reboiler (12) to provide heat for the reboiler (12).

4. The carbon dioxide treatment system based on concentrated photovoltaic power generation according to claim 1, characterized in that: The hot water storage tank (15) is connected to the coal-fired boiler (1) and is used to provide preheated cooling water to the coal-fired boiler (1).

5. The carbon dioxide treatment system based on concentrated photovoltaic power generation according to claim 1, characterized in that: A rich liquid pump (7) is connected between the lean-rich liquid heat exchanger (6) and the bottom of the absorption tower (4), and a lean liquid pump (8) is connected between the lean-rich liquid heat exchanger (6) and the bottom of the desorption tower (5).

Images