CN115434885A - Carbon dioxide treatment system based on concentrating photovoltaic power generation - Google Patents

Carbon dioxide treatment system based on concentrating photovoltaic power generation Download PDF

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Publication number
CN115434885A
CN115434885A CN202211101873.2A CN202211101873A CN115434885A CN 115434885 A CN115434885 A CN 115434885A CN 202211101873 A CN202211101873 A CN 202211101873A CN 115434885 A CN115434885 A CN 115434885A
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heat
carbon dioxide
rich liquid
reboiler
heat exchanger
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何晓崐
李爱征
孔佳昌
李文涛
史云欢
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00—Steam engine plants not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/098—Components, parts or details
    • F03G6/108—Components, parts or details of the heat transfer system
    • F03G6/111—Heat transfer fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F03G6/121—Controlling or monitoring

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention provides a carbon dioxide treatment system based on concentrating photovoltaic power generation, which utilizes the waste heat of a concentrating photovoltaic heat collection module to provide heat for a carbon capture module so as to realize carbon dioxide capture, meanwhile, the heat of a photovoltaic photo-thermal unit is taken away, the temperature is reduced, the photovoltaic power generation efficiency is improved by temperature effect, and the triple effects of low carbon emission, solar energy utilization efficiency improvement and energy consumption saving can be realized.

Description

Carbon dioxide treatment system based on concentrating photovoltaic power generation
Technical Field
The invention relates to the technical field of solar heat utilization, in particular to a carbon dioxide treatment system based on concentrating photovoltaic power generation.
Background
The excessive emission of carbon dioxide is one of the main causes of greenhouse effect, and among large-scale emission sources of carbon dioxide, a thermal power plant using fossil fuel as a main energy source is the largest fixed emission source of carbon dioxide, and accounts for more than 60% of carbon emission in China. Therefore, in response to the national goals of carbon peaking and carbon neutralization, it is not slow to perform carbon capture modification on the existing coal-fired power plants and study how to effectively utilize renewable energy sources to replace the traditional fossil energy sources.
Currently, in the carbon dioxide capture technology, the alcohol amine method (MEA method) in the chemical absorption technology is most widely used as the carbon dioxide absorption method, and the technology is already applied to coal-fired power plants, but for the technology, the MEA and the carbon dioxide have strong binding capacity, the required regeneration heat consumption is large, and most of the heat sources in the prior art are steam in a steam turbine.
Because of wide distribution and large storage capacity of solar energy, the solar energy becomes the most widely researched renewable energy source at present. Therefore, some scholars propose to combine solar heat collection technology with carbon dioxide capture technology. With the advent and development of concentrated photovoltaic power generation technology, the photovoltaic efficiency is improved, but there is a higher heat flux density in smaller photovoltaic chips. Therefore, the concept of "photovoltaic-photothermal integrated utilization" appears in the field of vision of people.
Disclosure of Invention
The invention aims to provide a carbon dioxide treatment system based on concentrating photovoltaic power generation, which can supply heat to a carbon capture module by utilizing the waste heat of a concentrating photovoltaic heat collection module.
In order to achieve the above object, the present invention provides a carbon dioxide treatment system based on concentrated photovoltaic power generation, comprising:
the flue gas generation module is used for providing flue gas containing carbon dioxide;
a carbon capture module including 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, the flue gas generation module and the mixer respectively feed the flue gas and an MEA absorbent to the bottom and the top of the absorption tower, the MEA absorbent absorbs the carbon dioxide in the flue gas and forms a cold rich liquid, 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, the absorption tower and the desorption tower respectively feed 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 exchange heat in the lean liquid heat exchanger and respectively become a hot rich liquid and a cold lean liquid, the hot rich liquid in the lean-rich liquid heat exchanger returns 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 and form a hot lean liquid, the lean liquid passes through the cooler, and the lean liquid in the heat exchanger is supplied to the MEA to the mixer to supplement the cold water and the absorption water to form the MEA water;
spotlight photovoltaic thermal-arrest module, including a plurality of photovoltaic light and heat units and oil tank, it is a plurality of the entry of photovoltaic light and heat unit is all connected the reboiler, and is a plurality of the export of photovoltaic light and heat unit is passed through the oil tank is connected the reboiler, the photovoltaic light and heat unit lets in after with the conduction oil heating in the oil tank, the oil tank provides the conduction oil the reboiler, for the heat is provided to the reboiler, makes the reboiler produces steam.
Optionally, the flue gas generation module is a coal-fired boiler in a coal-fired power plant, the coal-fired boiler is connected with the generator through a steam turbine, the coal-fired boiler generates steam through burning coal and pushes the steam turbine to do work, so that the generator generates electricity, and the coal-fired boiler generates the flue gas.
Optionally, a steam outlet and a 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.
Optionally, after the MEA absorbent absorbs carbon dioxide in the flue gas, the remaining flue gas is discharged through an overhead discharge port of the absorption tower; the carbon capture module also comprises an outlet cooler which is connected with the tower top discharge port of the desorption tower and is used for cooling and discharging the carbon dioxide desorbed from the hot rich liquid in the desorption tower.
Optionally, the method further includes:
the preheating water module comprises a heat storage water tank and an oil-water heat exchanger, wherein the oil-water heat exchanger is located in a plurality of inlets of the photovoltaic photo-thermal units and between reboilers and used for heat exchange with heat conduction oil, the heat storage water tank is connected with the oil-water heat exchanger, an outlet cooler and a cooler, and the cooler is used for supplying cooling water to the oil-water heat exchanger and temporarily storing the cooling water after absorbing heat.
Optionally, the heat storage water tank is connected with the coal-fired boiler and is used for providing preheated cooling water for the coal-fired boiler.
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.
The carbon dioxide treatment system based on concentrating photovoltaic power generation provided by the invention has the following beneficial effects:
1) The waste heat of the concentrating photovoltaic heat collecting module is utilized to provide heat for the carbon capturing module, so that carbon dioxide capturing is realized, meanwhile, as the heat of the photovoltaic photo-thermal unit is taken away, the temperature is reduced, and the temperature effect shows that the photovoltaic power generation efficiency is improved, so that the triple effects of low-carbon emission, improvement of solar energy utilization efficiency and energy consumption saving can be realized.
2) The concentrating photovoltaic heat collecting module is combined with a coal-fired power plant, heat in the residual heat of the photovoltaic photo-thermal unit and the heat in the same grade as the regenerative heat in the carbon capturing system is fully utilized to supply energy for carbon capturing, and low-carbon emission of the coal-fired power plant is realized;
3) Steam in a steam turbine can be adopted to supply energy to the carbon capture module at night, so that irreversible loss caused by the fact that steam subjected to temperature reduction and pressure reduction is largely used in a traditional method is reduced, and high-grade energy waste is caused;
4) The preheating water module can recycle low-grade heat in the whole system, improve the energy utilization efficiency of the system and save coal consumption.
Drawings
FIG. 1 is a schematic structural diagram of a concentrated photovoltaic power generation-based carbon dioxide treatment system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a concentrating photovoltaic heat collection module according to an embodiment of the present invention;
wherein the reference numerals are:
the system comprises a boiler 1, a steam turbine 2, a generator 3, an absorption tower 4, a desorption tower 5, a lean and rich liquid heat exchanger 6, a rich liquid pump 7, a lean liquid pump 8, a mixer 9, a cooler 10, an outlet cooler 11, a reboiler 12, a photovoltaic photo-thermal unit 13, an oil-water heat exchanger 14, a heat storage water tank 15, an inlet pump 16, an outlet pump 17, an oil tank 18 and a concentrating photovoltaic heat collection module 19.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a carbon dioxide processing system based on concentrating photovoltaic power generation provided in this embodiment, and fig. 2 is a schematic structural diagram of a concentrating photovoltaic heat collecting module provided in this embodiment. As shown in fig. 1 and 2, the carbon dioxide treatment system based on concentrating photovoltaic power generation includes a flue gas generation module, a concentrating photovoltaic heat collection module 19, and a preheated water module.
Specifically, the flue gas generation module is used for providing flue gas containing carbon dioxide. In this embodiment, the flue gas generation module is coal fired boiler 1 in the coal fired power plant, coal fired boiler 1 passes through steam turbine 2 and connects generator 3, coal fired boiler 1 produces steam and promotes through burning coal steam turbine 2 does work, so that generator 3 generates electricity, coal fired boiler 1 produces the flue gas.
The carbon capture module is used for capturing 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-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.
The absorption tower 4 is connected to the coal-fired boiler 1 (specifically, connected to the exhaust gas outlet of the coal-fired boiler 1) and the mixer 9, the flue gas generation module can introduce the generated flue gas to the bottom of the absorption tower 4, and the mixer 9 introduces the MEA absorbent to the top of the absorption tower 4. After the MEA absorbent contacts the flue gas, the MEA absorbent can absorb 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 residual flue gas is discharged through the tower top discharge outlet of the absorption tower.
The bottom of the absorption tower 4 is connected with the lean-rich liquid heat exchanger 6 through the rich liquid pump 7, the top of the desorption tower 5 is connected with the lean-rich liquid heat exchanger 6, and the bottom of the desorption tower 5 is connected with the lean-rich liquid heat exchanger 6 through the lean liquid pump 8. The rich liquid pump 7 may 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 may pump the hot lean liquid at the bottom of the desorption tower 5 into the lean-rich liquid heat exchanger 6, where the cold rich liquid and the hot lean liquid exchange heat, the cold rich liquid absorbs heat to form a hot rich liquid, and the hot lean liquid releases heat to form a cold lean liquid (flowing to the bottom of the desorption tower 5).
Further, the hot rich liquid in the lean-rich liquid heat exchanger 6 returns to the top of the desorption tower 5, the reboiler 12 heats the hot lean liquid in the bottom of the desorption tower 5 to generate steam, the steam is contacted with the hot rich liquid in the desorption tower 5, so as to desorb carbon dioxide from the hot rich liquid in the desorption tower 5, and the hot rich liquid again forms the hot lean liquid (the hot lean liquid enters the lean-rich liquid heat exchanger 6 for circulation). An outlet cooler 11 is connected to a top discharge port of the desorption tower 5, and carbon dioxide in the desorption tower 5 is cooled by the outlet cooler 11 and then discharged.
Further, the lean-rich liquid heat exchanger 6 is connected to the mixer 9 through the cooler 10, and the cold lean liquid in the lean-rich liquid heat exchanger 6 is cooled by the cooler 10 to form a cold lean liquid. The cooler 10 passes cold lean solution into the mixer 9, which may replenish the MEA absorbent and water in the mixer 9.
The concentrating photovoltaic heat collecting module 19 comprises a plurality of photovoltaic photo-thermal units 13 and an oil tank 18, the inlet of each photovoltaic photo-thermal unit 13 is connected with the reboiler 12, the outlet of each photovoltaic photo-thermal unit 13 is connected with the reboiler 12 through the oil tank 18, the photovoltaic photo-thermal units 13 heat conduction oil and then feed the heat conduction oil into the oil tank 18, the oil tank 18 supplies the heat conduction oil after heating to the reboiler 12 to provide heat for the reboiler 12, so that the reboiler 12 heats hot lean solution in the tower bottom of the desorption tower 5 to generate steam. The process is after the conduction oil of reboiler 12 releases the heat, gets back to a plurality of again heat among the photovoltaic light and heat unit 13, forms the circulation.
In this embodiment, it is a plurality of photovoltaic light and heat unit 13 the entry with be connected with the inlet pump 16 between the reboiler 12, it is a plurality of photovoltaic light and heat unit 13 the export with be connected with the exit pump 17 between the reboiler 12, the inlet pump 16 with the exit pump 17 can accelerate the circulation of conduction oil.
Optionally, photovoltaic light and heat unit 13 can be current photovoltaic light and heat system, for example can be become by structures such as fresnel lens, secondary prism, photovoltaic chip, PCB board, heat collector, photovoltaic light and heat unit 13 can arrange with point type, line type, array type, and the conduction oil is in enter into every under the effect of inlet pump 16 in the photovoltaic light and heat unit 13, under fresnel lens's effect, solar energy flux density is promoted, assembles the photovoltaic chip on, the heat is collected by the conduction oil under the effect of heat collector the effect of outlet pump 17 is got into down oil tank 18, quilt again oil tank 18 provides reboiler 12.
It can be understood that sunlight with the wavelength matched with the band gap energy of the photovoltaic chip can be converted into electric energy, the generated electric quantity can be input into a power grid, and only heat which cannot be converted into the electric energy can be collected by the heat conducting oil under the action of the heat collector.
Further, the oil tank 18 can adjust the operating pressure of the heat transfer oil, and in order to ensure the uniformity of the heating efficiency of each photovoltaic photo-thermal unit 13, the pipelines of the concentrating photovoltaic heat collecting modules 19 can be arranged in the same way.
In this embodiment, 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, so that the reboiler 12 heats the hot lean solution in the bottom of the desorption tower 5 to generate steam, and the steam returns to the steam turbine 2 after releasing heat, thereby forming a cycle. Considering that the MEA absorbent desorption temperature exceeds 125 c, which degrades and corrodes equipment, the reboiler 12 has a heat exchange temperature difference of 10 c, and thus the temperature of the working fluid supplying heat to the reboiler 12 should be 135 c at the maximum. Since the steam outlet and the steam inlet of the steam turbine 2 are fixed, the temperature of the steam generated by the steam turbine 2 may be too high, and therefore, the steam generated by the steam turbine 2 may be cooled and decompressed and then supplied to the reboiler 12 to supply power to the reboiler 12.
As can be seen, in this embodiment, the heat required by the reboiler 12 can be supplied by the photovoltaic waste heat collected by the concentrating photovoltaic heat collecting module 19 in the daytime, and the photovoltaic power generation efficiency is improved under the action of the concentrating photovoltaic heat collecting module 19; at night, the heat required by the reboiler 12 may be provided by steam in the turbine 2 to ensure continuous system operation.
Preheating water module includes water oil heat exchanger 14 and heat storage water tank 15, water oil heat exchanger 14 is located a plurality of photovoltaic light and heat unit 13 the entry with between the reboiler 12, heat storage water tank 15 is connected water oil heat exchanger 14 cooler 10 reaches export cooler 11, cooling water enters into water oil heat exchanger 14 cooler 10 reaches take away heat load in the export cooler 11 for system normal operating is converged by the cooling water after the heating heat storage water tank 15 briefly stores.
It should be noted that the heat storage water tank 15 is connected to the oil-water heat exchanger 14, the cooler 10 and the outlet cooler 11 in such a manner that the heat storage water tank is connected to the oil-water heat exchanger 14, the cooler 10 and the outlet cooler 11 in a circulation mode, and taking the oil-water heat exchanger 14 as an example, the heat storage water tank 15 is connected to the oil-water heat exchanger 14 in a circulation mode, so that the cooling water in the heat storage water tank 15 can enter the oil-water heat exchanger 14 to exchange heat with heat conduction oil, and the cooling water absorbs heat after heat exchange, increases the temperature, and returns to the heat storage water tank 15 to be stored temporarily.
Optionally, the heat storage water tank 15 may be connected to the coal-fired boiler 1, and is configured to supply preheated water to the coal-fired boiler 1.
It can be seen that, when the system is in operation, because the cooler 10 and the outlet cooler 11 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 the heat carried by the heat conducting oil still has available space, so that the heat is recovered by the oil-water heat exchanger 14, and the power consumption is saved.
In this embodiment, when the coal-fired power plant 1 is operating, most of the discharged flue gas may be pretreated to remove sulfide and other impurities, and then enters the carbon capture module, and carbon dioxide undergoes adsorption and desorption processes under the action of the MEA absorbent in the absorption tower 4. In the process, the heat conducting oil in the concentrating photovoltaic heat collecting module 19 is heated by the photovoltaic waste heat under the action of the heat collector, the temperature is increased, and then the heat conducting oil enters the reboiler 12 to supply heat to the reboiler 12. Meanwhile, heat in the photovoltaic photo-thermal unit 13 is taken away, and the photovoltaic power generation efficiency is improved. At night, the carbon capture module may extract steam from the turbine 2 to reduce the temperature and pressure and then supply heat to the reboiler 12. When the whole system operates, the cooler 10 and the outlet cooler 11 can generate a large amount of heat load, available space still exists in heat carried by heat conduction oil, the heat is collected by cooling water and provided for the coal-fired boiler 1 under the action of the oil-water heat exchanger 14, and when the water supply of the coal-fired boiler 1 is sufficient, the heat storage water tank 15 can temporarily store the preheated cooling water.
For the carbon capture module, the amount of carbon dioxide captured by the carbon capture module can be adjusted by changing the amount of MEA absorbent supplied, or by changing the heat duty of the reboiler 12. If the amount of trapped carbon dioxide is increased, the supply amount of the MEA absorbent needs to be increased, and conversely, the supply amount of the MEA absorbent needs to be decreased. In terms of adjusting the heat load of the reboiler 12, if the amount of captured carbon dioxide is to be reduced, the heat load of the reboiler 12 is to be reduced, for example, the flow rate of the heat transfer oil is to be reduced, so that the supplied heat is reduced and the reaction rate is reduced; if the carbon dioxide capture amount needs to be increased, the heat load of the reboiler 12 needs to be increased, the flow of the heat conduction oil can be increased, the flow of the heat conduction oil entering the reboiler 12 is increased, and the transferred heat is increased accordingly.
For the concentrating photovoltaic heat collecting module 19, only directly irradiated solar energy can be effectively utilized, and thus high-precision sunlight tracking is an important component. For the point focusing condenser, in order to ensure that the solar radiation is effectively focused on the photovoltaic chip, a heliostat system with dual-axis tracking is adopted to ensure the maximum working efficiency of the point focusing condenser. In the embodiment, the most common coaxial tracking system is adopted in the double-shaft tracking heliostat system, and the rotation of the common roller of the condenser and the independent inclined shaft of each condenser are utilized to adjust the angle, so that the sun tracking is realized, and more favorable guarantee is provided for the efficient operation of the heat collecting system. The heat which can not be converted into electric energy in the system is effectively collected by the heat conducting oil under the action of the heat collector.
At night, the concentrating photovoltaic heat collecting module 19 stops working, the heat required by the reboiler 12 comes from the high-temperature and high-pressure steam extracted from the steam turbine 2, and the steam can meet the temperature and pressure requirements of the reboiler 12 after being depressurized and cooled. When the solar radiation intensity is insufficient, the heat required by the reboiler 12 can be obtained from the concentrating photovoltaic heat collecting module 19 and the steam turbine 2 at the same time.
For the preheating water module, the cooling heat load when the carbon capture module operates and the redundant heat of the heat conducting oil can be transferred to cooling water, the heated cooling water can be guided into a water cooling wall in the coal-fired boiler 1 for further heating, and when the water quantity required by the water cooling wall is sufficient, heat preservation storage is carried out in the heat storage water tank.
In conclusion, in the carbon dioxide processing system based on concentrating photovoltaic power generation provided by the embodiment, the waste heat of the concentrating photovoltaic heat collecting module is used for providing heat for the carbon capturing module, so that carbon dioxide capturing is realized, meanwhile, as the heat of the photovoltaic photo-thermal unit is taken away, the temperature is reduced, and the temperature effect shows that the photovoltaic power generation efficiency is improved, the triple effects of low-carbon emission, improvement of the solar energy utilization efficiency and energy consumption saving can be realized. The concentrating photovoltaic heat collecting module is combined with a coal-fired power plant, heat in the residual heat of the photovoltaic photo-thermal unit and the heat in the same grade as the regenerative heat in the carbon capturing system is fully utilized to supply energy for carbon capturing, and low-carbon emission of the coal-fired power plant is realized; steam in a steam turbine can be adopted to supply energy to the carbon capture module at night, so that irreversible loss caused by the fact that a large amount of steam subjected to temperature reduction and pressure reduction is used in the traditional method is reduced, and high-grade energy waste is caused; the preheating water module can recycle low-grade heat in the whole system, improve the energy utilization efficiency of the system and save coal consumption.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.
It should be noted that, although the present invention has been described with reference to the preferred embodiments, the above embodiments are not intended to limit the present invention. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
It should be further understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and are not intended to imply a logical or sequential relationship between various components, elements, steps, or the like, unless otherwise indicated or indicated.
It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. It must be noted that, as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, reference to "a step" or "an apparatus" means a reference to one or more steps or apparatuses and may include sub-steps as well as sub-apparatuses. 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 the definition of a logical "exclusive or" unless the context clearly dictates otherwise. Further, implementation of the methods and/or apparatus of embodiments of the present invention may include performing the selected task manually, automatically, or in combination.

Claims (7)

1. A carbon dioxide treatment system based on concentrating photovoltaic power generation is characterized by comprising:
the flue gas generation module is used 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 with the flue gas generation module and the mixer (9), the flue gas generation module and the mixer (9) respectively feed the flue gas and an MEA absorbent to the bottom and the top of the absorption tower (4), the MEA absorbent absorbs carbon dioxide in the flue gas to form a cold rich liquid, the lean-rich liquid heat exchanger (6) is connected with the bottom of the absorption tower (4) and the top and the bottom of the desorption tower (5), and the absorption tower (4) and the desorption tower (5) respectively feed the cold rich liquid and the hot lean liquid to the lean-rich liquid heat exchanger (6), the cold rich liquid and the hot barren liquid exchange heat in the barren rich liquid heat exchanger (6) and become hot rich liquid and cold barren liquid respectively, the hot rich liquid in the barren rich liquid heat exchanger (6) returns to the top of the desorption tower (5), the reboiler (12) heats the hot barren liquid in the desorption tower (5) to generate steam so as to desorb carbon dioxide in the hot rich liquid in the desorption tower (5) and form hot barren liquid, the barren rich liquid heat exchanger (6) is connected with the mixer (9) through the cooler (10), and the hot barren liquid in the barren rich liquid heat exchanger (6) forms cold barren liquid after being cooled by the cooler (10) and is supplied to the mixer (9) 9) To replenish the MEA absorbent and water in the mixer (9);
spotlight photovoltaic thermal-arrest module, including a plurality of photovoltaic light and heat unit (13) and oil tank (18), it is a plurality of the entry of photovoltaic light and heat unit (13) is all connected reboiler (12), it is a plurality of the export of photovoltaic light and heat unit (13) is passed through oil tank (18) are connected reboiler (12), let in behind photovoltaic light and heat unit (13) the conduction oil heating in oil tank (18), oil tank (18) provide the conduction oil reboiler (12), for reboiler (12) provides the heat, makes reboiler (12) steam production.
2. The concentrated photovoltaic power generation-based carbon dioxide treatment system according to claim 1, wherein the flue gas generation module is a coal-fired boiler (1) in a coal-fired power plant, the coal-fired boiler (1) is connected with a generator (3) through a steam turbine (2), the coal-fired boiler (1) generates steam by burning coal and pushes the steam turbine (2) to do work, so that the generator (3) generates electricity, and the coal-fired boiler (1) generates the flue gas.
3. The concentrated photovoltaic power generation-based carbon dioxide processing system according to claim 2, wherein a steam outlet and a steam inlet of the steam turbine (2) are connected to the reboiler (12), and the steam turbine (2) supplies the generated steam to the reboiler (12) to supply heat to the reboiler (12).
4. The concentrated photovoltaic power generation-based carbon dioxide treatment system according to claim 3, wherein after the MEA absorbent absorbs carbon dioxide in the flue gas, the residual flue gas is discharged through an overhead discharge port of the absorption tower; the carbon capture module also comprises an outlet cooler (11) which is connected with the top discharge port of the desorption tower (5) and is used for cooling and discharging the carbon dioxide desorbed from the hot rich liquid in the desorption tower (5).
5. The concentrated photovoltaic power generation-based carbon dioxide treatment system of claim 4, further comprising:
preheating water module, including heat storage water tank (15) and oil and water heat exchanger (14), oil and water heat exchanger (14) are located a plurality ofly photovoltaic light and heat unit (13) the entry with between reboiler (12), be used for with the conduction oil heat transfer, heat storage water tank (15) are connected oil and water heat exchanger (14) export cooler (11) reach cooler (10), be used for to oil and water heat exchanger (14) export cooler (11) reach cooler (10) provide the cooling water and keep in the cooling water after the absorption heat.
6. The concentrated photovoltaic power generation-based carbon dioxide processing system according to claim 5, wherein the hot water storage tank (15) is connected to the coal-fired boiler (1) and is used for providing preheated cooling water for the coal-fired boiler (1).
7. The concentrated photovoltaic power generation-based carbon dioxide treatment system according to claim 1, wherein 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).
CN202211101873.2A 2022-09-09 2022-09-09 Carbon dioxide treatment system based on concentrating photovoltaic power generation Pending CN115434885A (en)

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