Calcium-based carbon capture system and method combining CO2 capture and energy storage for power station boiler

Abstract

The invention relates to a calcium-based carbon capture system and method combining CO2 capture and energy storage for a power station boiler. The invention relates to the technical field of power station boiler calcium-based carbon capture, and relates to the technical field of power station boiler calcium-based carbon capture, the principle that CaCO3 is decomposed into CaO and CO2 for heat absorption is utilized to realize desorption and separation of CO2 and convert crest redundant electricity of new energy into chemical energy, and the principle that CaO and CO2 are combined for heat release is utilized to capture CO2 from exhaust smoke of a power station boiler and convert chemical energy into heat energy. And feeding into a downstream system for utilization. Therefore, the goal of combining CO2 capture and energy storage is achieved. Thermal power can be better coupled with new energy, the peak load shifting effect is achieved, the power supply pressure in the peak period of a power grid is relieved, the stability of the power grid is improved, meanwhile, low-cost CO2 removal is achieved, the advantage of low price of valley electricity is utilized, and the operation or heat supply cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of calcium-based carbon capture for power station boilers. 2 Calcium-based carbon capture system and method combining capture and energy storage. Background Art

[0002] In the context of global response to climate change, reducing carbon dioxide emissions and achieving efficient use and storage of energy have become key research directions in the energy field. As one of the main sources of carbon emissions, power plant boilers have attracted much attention for their energy conservation and emission reduction as well as the development of supporting energy storage technologies.

[0003] At present, the thermal energy storage technologies for power station boilers mainly include molten salt energy storage and electric boiler energy storage. Molten salt energy storage is limited by the decomposition temperature of molten salt, and can usually only heat the working fluid to less than 400°C, which makes the quality of the generated steam low and cannot meet the needs of some industrial production or power generation links with high requirements for steam parameters. At the same time, the construction and maintenance costs of molten salt energy storage systems are relatively high, and molten salt may corrode equipment during long-term use, affecting the stability and service life of the system.

[0004] Electric boiler energy storage is mainly used to generate hot water as a heat source, and its scope of use is relatively narrow. On the one hand, the energy density of hot water is limited, which makes it difficult to meet large-scale, high-energy demand application scenarios; on the other hand, electric boiler energy storage has certain limitations in conversion efficiency, and when the power supply is tight, its operation may be restricted and it cannot provide heat energy continuously and stably.

[0005] In terms of carbon dioxide capture technology, although a variety of methods have been developed and applied, most existing technologies only focus on the capture of carbon dioxide and fail to effectively combine with energy storage technology. For example, the common chemical absorption method uses amine solutions to absorb carbon dioxide. Although the capture efficiency is high, the process consumes a lot of energy for desorbing carbon dioxide and does not involve energy storage and reuse; physical adsorption methods, such as using activated carbon and other adsorbents to adsorb carbon dioxide, also only focus on the separation of carbon dioxide and do not consider how to link the capture process with energy storage.

[0006] There is currently a lack of integration of energy storage and CO 2 In the prior art, energy storage and carbon dioxide emission reduction are often regarded as two independent processes, lacking the concept of coordinated optimization. This separate technical model not only leads to low energy utilization efficiency, but also increases the complexity and cost of the system. The present invention can achieve high-purity CO2 in the process of energy storage. 2 The capture of carbon dioxide can significantly reduce the operating costs.

[0007] Therefore, it is necessary to develop a thermal energy storage and CO2 collector that can achieve efficient storage and utilization of energy while reducing carbon dioxide emissions. 2 Capture and combination technology is very necessary to provide strong technical support for the sustainable development of the power plant boiler industry. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention provides a CO collector for a power station boiler. 2 Calcium-based carbon capture system and method combining capture and energy storage.

[0009] The present invention provides the following technical solutions:

[0010] A CO collector for power station boilers 2 A calcium-based carbon capture system combining capture and energy storage, the system comprising a flue gas inlet pipe, a reactor, an electromagnetic heating device, an outlet pipe, a CO 2 Cooling device, flue gas outlet pipe and CO 2 Lead out tube.

[0011] The flue gas inlet pipe is connected to the reactor, the reactor has a built-in electromagnetic heating device, the reactor is connected to the outlet pipe, and the outlet pipe is connected to the CO 2 Cooling device and flue gas outlet pipe, CO 2 Cooling unit connected to CO 2 Lead out tube.

[0012] Preferably, the energy storage and carbon capture medium of the system adopts CaO.

[0013] A CO collector for power station boilers 2 A calcium-based carbon capture method combining capture and energy storage, the method is based on a CO2 collection method of a power station boiler. 2 The method is realized by a calcium-based carbon capture system combining capture and energy storage, and is characterized in that: the method comprises the following steps:

[0014] When the power grid has redundant peak power, the power station boiler collects CO 2 The calcium-based carbon capture system combines capture and energy storage, using an electromagnetic heating device to heat the CaCO in the reactor. 3 Decomposes into CaO and CO 2 , converting electrical energy into chemical energy.

[0015] When the power grid is at its peak, the CO2 collected by the power station boiler 2 The calcium-based carbon capture system combines capture and energy storage. Flue gas is introduced into the reactor, and the CO in the flue gas 2 Reacts with the decarbonized CaO in the reactor to generate CaCO 3 , converting chemical energy into thermal energy.

[0016] Preferably, the specific process of converting electrical energy into chemical energy is:

[0017] The redundant peak power of new energy is used to heat the reactor through an electromagnetic heating device, so that the CaCO in the reactor 3 Decomposes into CaO and CO 2 , then CO 2 Entering the CO through the outlet pipe 2 Cooling device, via CO 2 The outlet pipe enters the downstream collection equipment to convert electrical energy into chemical energy.

[0018] Preferably, the specific process of converting chemical energy into thermal energy is:

[0019] Flue gas is introduced into the reactor through the flue gas inlet, and the CO in the flue gas 2 Reacts with the decarbonized CaO in the reactor to generate CaCO 3 , and releases heat at the same time, heating the decarbonized flue gas to 650-670℃. The decarbonized flue gas enters the flue gas outlet pipe through the outlet pipe, realizing the conversion of chemical energy into thermal energy.

[0020] Preferably, the flue gas is low dust and low sulfur flue gas from after a desulfurization tower.

[0021] Preferably, the captured CO 2 Reaction and CO removal 2 The two processes share a common reactor and are operated alternately to capture CO 2 , CO removal 2 , electrical energy is converted into chemical energy for storage and chemical energy is converted into thermal energy for release.

[0022] Preferably, the high-temperature flue gas is used to couple with a boiler or a heat recovery system, and can also be used as a heat source to provide heat to the outside.

[0023] A computer readable storage medium having a computer program stored thereon, the program being executed by a processor to implement a CO2 collection method for a power plant boiler 2 Calcium-based carbon capture method combining capture and energy storage.

[0024] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a CO2 collection method for a power plant boiler. 2 Calcium-based carbon capture method combining capture and energy storage.

[0025] The present invention has the following beneficial effects:

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The present invention utilizes CaCO 3Decomposes into CaO and CO 2 The principle of heat absorption realizes CO 2 The analytical separation and conversion of the peak redundant electricity of new energy into chemical energy, using CaO and CO 2 The principle of combined heat release is used to capture CO from the exhaust gas of power station boilers 2 And realize the conversion of chemical energy into thermal energy and send it to the downstream system for use. 2 The goal of combining capture and storage.

[0028] The present invention can better couple thermal power with renewable energy, play the role of peak shaving and valley filling, reduce the power supply pressure during peak hours of the power grid, improve the stability of the power grid, and achieve low-cost CO 2 Take advantage of the low price of off-peak electricity to reduce operating or heating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a system principle diagram of the present invention.

[0031] Among them, 1- flue gas inlet pipe, 2- reactor, 3- electromagnetic heating device, 4- outlet pipe, 5- CO 2 Cooling device, 6-smoke exhaust pipe, 7-CO 2 Lead out tube. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The present invention is described in detail below in conjunction with specific embodiments. Specific embodiment one:

[0038] according to Figure 1 As shown, the specific optimization technical solution adopted by the present invention to solve the above technical problems is: the present invention relates to a CO collector for a power station boiler 2 Calcium-based carbon capture system and method combining capture and energy storage.

[0039] A CO collector for power station boilers 2 A calcium-based carbon capture system combining capture and energy storage, the system comprising a flue gas inlet pipe 1, a reactor 2, an electromagnetic heating device 3, an outlet pipe 4, a CO 2 Cooling device 5, flue gas outlet pipe 6 and CO 2 Lead-out pipe 7;

[0040] The flue gas inlet pipe 1 is connected to the reactor 2, the reactor 2 has a built-in electromagnetic heating device 3, the reactor 2 is connected to the outlet pipe 4, and the outlet pipe 4 is connected to the CO 2 Cooling device 5 and flue gas outlet pipe 6, CO 2 Cooling device 5 connects CO 2 Lead-out pipe 7.

[0041] The system collects CO 2The integrated design of energy capture and storage can utilize the redundant peak power of new energy to heat the reactor 2 through the electromagnetic heating device 3 when the grid has a large amount of redundant peak power, so that the CaCO in the reactor 2 3 Decomposes into CaO and high-purity CO 2 , and then high-purity CO 2 Enter the CO through the outlet pipe 4 2 Cooling device 5, via CO 2 The outlet pipe 7 enters the downstream collecting device, and at the same time achieves the purpose of converting electrical energy into chemical energy.

[0042] When the power grid is at its peak, flue gas is introduced into the reactor 2 through the flue gas inlet 1. The flue gas is low-dust and low-sulfur flue gas from the desulfurization tower. 2 Reacts with the decarbonized CaO in reactor 2 to generate CaCO 3 , while releasing heat, heating the decarbonized flue gas to 650-670°C, and the decarbonized flue gas enters the flue gas outlet pipe 6 through the outlet pipe 4, achieving the purpose of converting chemical energy into thermal energy. The high-temperature flue gas can be used to couple with a boiler or a heat recovery system, or as a heat source to provide heat to the outside.

[0043] Captured CO 2 Reaction and CO removal 2 The two processes are operated alternately to capture CO 2 , CO removal 2 , the function of converting electrical energy into chemical energy for storage and converting chemical energy into thermal energy for heat release.

[0044] The present invention utilizes CaCO 3 Decomposes into CaO and CO 2 The principle of heat absorption realizes CO 2 The analytical separation and conversion of the peak redundant electricity of new energy into chemical energy, using CaO and CO 2 The principle of combined heat release is used to capture CO from the exhaust gas of power station boilers 2 And realize the conversion of chemical energy into thermal energy and send it to the downstream system for use. 2 The goal of combining capture and storage.

[0045] The present invention can better couple thermal power with renewable energy, play the role of peak shaving and valley filling, reduce the power supply pressure during peak hours of the power grid, improve the stability of the power grid, and achieve low-cost CO 2 Take advantage of the low price of off-peak electricity to reduce operating or heating costs. Specific embodiment 2:

[0047] The difference between the second embodiment of the present invention and the first embodiment is that:

[0048] The energy storage and carbon capture medium of the system adopts CaO. Specific embodiment three:

[0050] The difference between the third embodiment of the present invention and the second embodiment is that:

[0051] The present invention provides a CO collector for a power station boiler. 2 A calcium-based carbon capture method combining capture and energy storage, the method is based on a CO2 collection method of a power station boiler. 2 The method is realized by a calcium-based carbon capture system combining capture and energy storage, and the method comprises the following steps:

[0052] When the power grid has redundant peak power, the power station boiler collects CO 2 The calcium-based carbon capture system combines capture and energy storage, converting CaCO in the reactor into 3 Decomposes into CaO and CO 2 , converting electrical energy into chemical energy.

[0053] When the power grid is at its peak, the CO2 collected by the power station boiler 2 The calcium-based carbon capture system combines capture and energy storage. Flue gas is introduced into the reactor, and the CO in the flue gas 2 Reacts with the decarbonized CaO in the reactor to generate CaCO 3 , converting chemical energy into thermal energy.

[0054] The present invention utilizes CaCO 3 Decomposes into CaO and CO 2 The principle of heat absorption realizes CO 2 The analytical separation and conversion of the peak redundant electricity of new energy into chemical energy, using CaO and CO 2 The principle of combined heat release is used to capture CO from the exhaust gas of power station boilers 2 And realize the conversion of chemical energy into thermal energy and send it to the downstream system for use. 2 The goal of combining capture and storage.

[0055] The present invention can better couple thermal power with renewable energy, play the role of peak shaving and valley filling, reduce the power supply pressure during peak hours of the power grid, improve the stability of the power grid, and achieve low-cost CO 2 Take advantage of the low price of off-peak electricity to reduce operating or heating costs. Specific embodiment four:

[0057] The difference between the fourth embodiment of the present invention and the third embodiment is that:

[0058] The specific process of converting electrical energy into chemical energy is:

[0059] The redundant peak power of new energy is used to heat the reactor through an electromagnetic heating device, so that the CaCO in the reactor 3 Decomposes into CaO and CO 2 , then CO 2 Entering the CO through the outlet pipe 2 Cooling device, via CO 2 The outlet pipe enters the downstream collection equipment to convert electrical energy into chemical energy.

[0060] The present invention utilizes the redundant peak power of new energy to heat the reactor through an electromagnetic heating device, which plays a role in peak shaving and valley filling, reduces the power supply pressure of the power grid during peak hours, improves the stability of the power grid, and utilizes the low price advantage of valley electricity to reduce operation or heating costs. Specific embodiment five:

[0062] The difference between the fifth embodiment of the present invention and the fourth embodiment is that:

[0063] The specific process of converting chemical energy into thermal energy is:

[0064] Flue gas is introduced into the reactor through the flue gas inlet, and the CO in the flue gas 2 Reacts with the decarbonized CaO in the reactor to generate CaCO 3 , and releases heat at the same time, heating the decarbonized flue gas to 650-670℃. The decarbonized flue gas enters the flue gas outlet pipe through the outlet pipe, realizing the conversion of chemical energy into thermal energy. Specific embodiment six:

[0066] The difference between the sixth embodiment of the present invention and the fifth embodiment is that:

[0067] The flue gas is low dust and low sulfur flue gas coming from the desulfurization tower. Specific embodiment seven:

[0069] The difference between the seventh embodiment of the present invention and the sixth embodiment is that:

[0070] Captured CO 2 Reaction and CO removal 2 The two processes share a common reactor and are operated alternately to capture CO 2 , CO removal 2 , electrical energy is converted into chemical energy for storage and chemical energy is converted into thermal energy for release. Specific embodiment eight:

[0072] The difference between the eighth embodiment of the present invention and the seventh embodiment is that:

[0073] The high-temperature flue gas is used to couple with a boiler or a heat recovery system, and can also be used as a heat source to provide heat to the outside. Specific embodiment nine:

[0075] The difference between the ninth embodiment of the present invention and the eighth embodiment is that:

[0076] The present invention provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement a CO2 collection system for a power plant boiler. 2 Calcium-based carbon capture method combining capture and energy storage. Specific embodiment ten:

[0078] The difference between the tenth embodiment of the present invention and the ninth embodiment is that:

[0079] The present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a CO2 collection system for a power plant boiler. 2 Calcium-based carbon capture method combining capture and energy storage.

[0080] The above is only one kind of CO2 collection of power station boilers. 2 Preferred embodiment of calcium-based carbon capture system and method combining capture and energy storage, a CO2 collection system for power station boilers 2 The protection scope of the calcium-based carbon capture system and method combined with capture and energy storage is not limited to the above-mentioned embodiments, and all technical solutions under this idea belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, several improvements and changes without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A calcium-based carbon capture system combining CO2 capture and energy storage for power station boilers, characterized by: The system comprises a flue gas inlet pipe, a reactor, an electromagnetic heating device, an outlet pipe, a CO2 cooling device, a flue gas outlet pipe and a CO2 outlet pipe; The flue gas inlet pipe is connected to the reactor, the reactor has a built-in electromagnetic heating device, the reactor is connected to the outlet pipe, the outlet pipe is connected to the CO2 cooling device and the flue gas outlet pipe, and the CO2 cooling device is connected to the CO2 outlet pipe.

2. The system according to claim 1, characterized in that: The energy storage and carbon capture medium of the system adopts CaO.

3. A calcium-based carbon capture method combining CO2 capture and energy storage for a power plant boiler, the method being implemented based on the system of claim 1, and characterized by: The method comprises the following steps: When the power grid has redundant peak power, the calcium-based carbon capture system that combines CO2 capture and energy storage in the power station boiler decomposes CaCO3 in the reactor into CaO and CO2, converting electrical energy into chemical energy. When the power grid is at its peak, flue gas is introduced into the reactor through the power station boiler's calcium-based carbon capture system that combines CO2 capture and energy storage. The CO2 in the flue gas reacts with the decarbonized CaO in the reactor to generate CaCO3, converting chemical energy into thermal energy.

4. The method according to claim 3, characterized in that: The specific process of converting electrical energy into chemical energy is: The redundant peak power of new energy is used to heat the reactor through an electromagnetic heating device, so that the CaCO3 in the reactor is decomposed into CaO and CO2. Then the CO2 enters the CO2 cooling device through the outlet pipe, and enters the downstream collection equipment through the CO2 outlet pipe, realizing the conversion of electrical energy into chemical energy.

5. The method according to claim 3, characterized in that: The specific process of converting chemical energy into thermal energy is: Flue gas is introduced into the reactor through the flue gas inlet, and the CO2 in the flue gas reacts with the decarbonized CaO in the reactor to generate CaCO3 and release heat at the same time, heating the decarbonized flue gas to 650-670°C. The decarbonized flue gas enters the flue gas outlet pipe through the outlet pipe, realizing the conversion of chemical energy into thermal energy.

6. The method according to claim 3, characterized in that: The flue gas is low dust and low sulfur flue gas coming from the desulfurization tower.

7. The method according to claim 5, characterized in that: The captured CO2 reaction and the CO2 removal use the same set of reactors, and the two process flows operate alternately to achieve CO2 capture, CO2 removal, conversion of electrical energy into chemical energy storage, and conversion of chemical energy into thermal energy release.

8. The method according to claim 3, characterized in that: The high-temperature flue gas is used to couple with a boiler or a heat recovery system, and can also be used as a heat source to provide heat to the outside.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to any one of claims 3 to 8.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the method of any one of claims 3 to 8 is implemented.

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