Thermal chemical heat storage carbon capture device and thermal chemical heat storage carbon capture method

Abstract

The invention provides a thermochemical heat storage carbon capture device and a thermochemical heat storage carbon capture method.The thermochemical heat storage carbon capture device is characterized in that a heating piece is arranged in an endothermic reaction cavity and connected with a boiler so as to heat the endothermic reaction cavity through heat of the boiler; the oxide heat release part is provided with a heat release reaction cavity, an oxide inlet and a hydroxide outlet, the oxide inlet is communicated with the oxide outlet, the carbon capture part is provided with a carbon capture cavity, a hydroxide inlet and a flue gas inlet, the hydroxide inlet is communicated with the hydroxide outlet, and the flue gas inlet is communicated with a flue gas outlet of a boiler; the heat supply network water heater is arranged in the oxide heat release piece and the carbon capture piece and used for heating return water of the heat supply network. Through the technical scheme provided by the invention, the problem of high engineering construction cost of thermochemical heat storage and energy storage equipment and carbon capture equipment of a coal-fired thermal power generating unit in related technologies can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat storage and carbon capture, and in particular to a thermochemical heat storage carbon capture device and a thermochemical heat storage carbon capture method. Background Art

[0002] With the development of society, energy crisis and environmental problems are becoming increasingly prominent. Promoting the realization of global carbon neutrality has become a common goal of the international community. Profound energy structure reforms are being carried out around the world, and green energy such as solar energy and wind energy are gradually becoming dominant. In 2018, about 10% of the electricity in the global energy system came from renewable energy. According to the International Renewable Energy Agency, this figure will increase to 35% by 2030, and by 2050, green energy will provide more than 60% of global power generation, becoming the core force of future energy supply. Against the background of rapid development of such new energy, in order to adapt to the volatility and intermittency of renewable energy, the power industry requires current coal-fired thermal power units to improve their flexibility, peaking and frequency regulation capabilities, and on the other hand, requires thermal power units to carry out carbon reduction or carbon capture.

[0003] In the relevant technologies, measures for coal-fired power units to improve their flexibility, peak-shaving and frequency-regulating capabilities are mostly to achieve heat storage and energy storage through steam turbines or heat network water heat storage to increase the flexibility of thermal power units. The heat storage and energy storage technologies include water heat storage, solid heat storage and molten salt heat storage. Water heat storage has low cost but cannot supply steam. Molten salt heat storage has the problem of high investment and high cost. Solid heat storage has the problem of large heat storage body and large area occupied. As a new type of heat storage and energy storage technology, thermochemical heat storage has the characteristics of high heat storage density and moderate cost.

[0004] However, the related art has the problem of high engineering construction costs for the thermochemical heat storage equipment and carbon capture equipment of coal-fired power plants. Summary of the invention

[0005] The present invention provides a thermochemical thermal storage carbon capture device and a thermochemical thermal storage carbon capture method to solve the problem of high engineering construction cost of thermochemical thermal storage energy storage equipment and carbon capture equipment of coal-fired thermal power units in the related art.

[0006] According to one aspect of the present invention, a thermochemical heat storage carbon capture device is provided, which includes: an endothermic reaction unit, including an endothermic reaction element and a heating element, the endothermic reaction element having an endothermic reaction chamber and a reaction raw material inlet and an oxide outlet connected to the endothermic reaction chamber, the heating element being arranged in the endothermic reaction chamber, the heating element being connected to a boiler to utilize the heat of the boiler to heat the endothermic reaction chamber; an exothermic reaction unit, including an oxide exothermic element, a carbon capture element and a hot network water heater, the oxide exothermic element having an exothermic reaction chamber and an oxide inlet and a hydroxide outlet connected to the exothermic reaction chamber, the oxide inlet being connected to the oxide outlet, the carbon capture element having a carbon capture chamber and a hydroxide inlet and a flue gas inlet connected to the carbon capture chamber, the hydroxide inlet being connected to the hydroxide outlet, the flue gas inlet being connected to the flue gas outlet of the boiler, the hot network water heater being arranged in the oxide exothermic element and the carbon capture element, the hot network water heater being used to heat the return water of the heating network.

[0007] Furthermore, the heating element includes a flue gas heat exchange element, the flue gas heat exchange element has a flue gas channel, and the flue gas channel is connected to the flue gas duct of the boiler.

[0008] Furthermore, the heating element also includes an electric heating element, and the power supply of the electric heating element comes from the peak-shaving and frequency-regulating surplus power of the thermal power unit or the power grid.

[0009] Further, the thermochemical heat storage carbon capture device also includes a first drying element, the first drying element has a first drying chamber, the liquid inlet of the first drying chamber is connected to the hydroxide outlet, the solid outlet of the first drying chamber is connected to the hydroxide inlet, and the first drying element is connected to the boiler to use the heat of the boiler to heat the first drying chamber; and / or, the carbon capture element includes a tank body, a spray pipe and a flue gas pipe, the carbon capture chamber, the hydroxide inlet and the flue gas inlet are all arranged on the tank body, the spray pipe is arranged in the carbon capture chamber, the inlet of the spray pipe is connected to the hydroxide inlet, the spray pipe has a plurality of spray heads, the flue gas pipe is arranged in the carbon capture chamber and is located below the spray pipe, the inlet of the smoke pipe is connected to the smoke inlet, and the smoke pipe has a plurality of pores connected to the carbon capture chamber.

[0010] Furthermore, the endothermic reaction element includes a carbonate decomposition unit, the endothermic reaction chamber includes a carbonate decomposition chamber of the carbonate decomposition unit, the reaction raw material inlet includes a decomposition inlet of the carbonate decomposition unit, and the carbon capture element also has a carbonate outlet, which is connected to the decomposition inlet of the carbonate decomposition unit.

[0011] Furthermore, the thermochemical heat storage carbon capture device also includes a second drying element, which has a second drying chamber, the liquid inlet of the second drying chamber is connected to the carbonate outlet, the solid outlet of the second drying chamber is connected to the decomposition inlet of the carbonate decomposition unit, and the second drying element is connected to the boiler to utilize the heat of the boiler to heat the second drying chamber.

[0012] Furthermore, the thermochemical heat storage carbon capture device also includes a carbon dioxide sealing component, and the carbonate decomposition unit has a carbon dioxide outlet connected to the carbonate decomposition chamber, and the carbon dioxide outlet is connected to the carbon dioxide sealing component.

[0013] Furthermore, the endothermic reaction element also includes a hydroxide decomposition unit, the endothermic reaction chamber also includes a hydroxide decomposition chamber of the hydroxide decomposition unit, the reaction raw material inlet also includes a decomposition inlet of the hydroxide decomposition unit, and the hydroxide outlet is connected to the decomposition inlet of the hydroxide decomposition unit.

[0014] Furthermore, the heating element also includes a steam extraction heat exchange element, the inlet of the steam extraction heat exchange element is connected to the steam extraction outlet of the thermal power unit, and the steam extraction heat exchange element is used to heat the hydroxide decomposition chamber.

[0015] According to another aspect of the present invention, a thermochemical thermal storage carbon capture method is provided, and the thermochemical thermal storage carbon capture method can be applied to the thermochemical thermal storage carbon capture device provided above, and the thermochemical thermal storage carbon capture method comprises: designing the heat storage capacity of the endothermic reaction component of the thermochemical thermal storage carbon capture device and the capacity of the heating component of the thermochemical thermal storage carbon capture device according to the heat storage energy storage demand of the internal source load storage of the power grid; designing the capacity of the heat network water heater of the thermochemical thermal storage carbon capture device according to the heating demand of the thermal power unit and the external heat users; designing the capacity of the carbon capture component of the thermochemical thermal storage carbon capture device according to the flue gas emission of the boiler; designing the heat release of the oxide heat release component according to the heat release of the carbon capture component and the heat demand of the heat network water heater, so that the sum of the heat release of the carbon capture component and the heat release of the oxide heat release component meets the heat demand of the heat network water heater.

[0016] By applying the technical solution of the present invention, the thermochemical heat storage carbon capture device includes an endothermic reaction unit and an exothermic reaction unit. When the thermal power unit adapts to the volatility and intermittency of renewable energy, the thermal power unit is peak-shaving and frequency-modulated. The heating element is arranged in the endothermic reaction chamber and connected to the thermal power unit, so that the endothermic reaction chamber absorbs the surplus energy of the thermal power unit, and the reaction raw materials in the endothermic reaction chamber absorb the surplus energy and convert it into chemical energy in the oxide, thereby recovering and storing the surplus energy of the thermal power unit. The heat network water heater is arranged in the oxide exothermic element and the carbon capture element, and the heating element is connected to the endothermic reaction chamber. The water flow channel of the heat network water heater is connected to the circulating water network of the thermal power unit (including heat network water, condensate or feed water of the thermal power unit), so that the heat network water heater uses the heat generated by the oxide exothermic component and the carbon capture component to heat the circulating water network, converts the chemical energy in the oxide into heat to heat the circulating water network, realizes the flexible heat storage and energy storage of the thermal power unit, responds to the deep peak-shaving auxiliary service signal of the power grid, increases the income of the thermal power unit, and connects the flue gas inlet of the carbon capture component to the flue gas outlet of the thermal power unit, and can also use the carbon capture component to capture carbon dioxide in the flue gas of the thermal power unit. Therefore, the thermochemical thermal storage carbon capture device combines carbon capture technology with thermochemical thermal storage and energy storage technology, realizes the two functions of heat storage and carbon capture through a set of devices, reduces the cost of engineering construction, and is of great significance to the flexibility transformation and low-carbon transformation of future thermal power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It shows a schematic structural diagram of a thermochemical heat storage carbon capture device according to an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a carbon capture component of a thermochemical heat storage carbon capture device according to an embodiment of the present invention is shown;

[0020] Figure 3 A flow chart of a thermochemical thermal storage carbon capture method provided according to an embodiment of the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. endothermic reaction unit; 11. endothermic reaction element; 111. endothermic reaction chamber; 112. reaction raw material inlet; 113. oxide outlet; 114. carbonate decomposition unit; 115. hydroxide decomposition unit; 12. heating element; 121. electric heating element;

[0023] 20. Exothermic reaction unit; 21. Oxide exothermic element; 211. Exothermic reaction chamber; 212. Oxide inlet; 213. Hydroxide outlet; 22. Carbon capture element; 221. Carbon capture chamber; 222. Hydroxide inlet; 223. Flue gas inlet; 224. Tank; 225. Spray pipe; 2251. Spray head; 226. Flue gas pipe; 2261. Air hole; 227. Hydroxide solution;

[0024] 30. Thermal power unit; 31. Flue gas outlet; 32. Extraction steam outlet; 33. Boiler; 34. Steam turbine; 35. Generator; 36. Flue gas duct;

[0025] 40. Hot network water heater. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0027] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a thermochemical heat storage carbon capture device, which includes an endothermic reaction unit 10 and an exothermic reaction unit 20. The endothermic reaction unit 10 includes an endothermic reaction element 11 and a heating element 12. The endothermic reaction element 11 has an endothermic reaction chamber 111 and a reaction raw material inlet 112 and an oxide outlet 113 connected to the endothermic reaction chamber 111. The heating element 12 is arranged in the endothermic reaction chamber 111. The heating element 12 is connected to a thermal power unit 30 to heat the endothermic reaction chamber 111 with the energy of the thermal power unit 30. The exothermic reaction unit 20 includes an oxide exothermic element 21, a carbon capture element 22 and a hot network water heater 40. The oxide exothermic element 21 is connected to the thermal power unit 30 to heat the endothermic reaction chamber 111. The boiler 1 has an exothermic reaction chamber 211 and an oxide inlet 212 and a hydroxide outlet 213 connected to the exothermic reaction chamber 211, the oxide inlet 212 is connected to the oxide outlet 113, the carbon capture element 22 has a carbon capture chamber 221 and a hydroxide inlet 222 and a flue gas inlet 223 connected to the carbon capture chamber 221, the hydroxide inlet 222 is connected to the hydroxide outlet 213, the flue gas inlet 223 is connected to the flue gas outlet 31 of the boiler 33, and a heat network water heater 40 is arranged in the oxide exothermic element 21 and the carbon capture element 22 to absorb the heat generated by the oxide exothermic element 21 and the carbon capture element 22, and the heat network water heater 40 is used to heat the return water of the heating pipe network.

[0028] The thermochemical heat storage carbon capture device provided in this embodiment is applied. The thermochemical heat storage carbon capture device includes an endothermic reaction unit 10 and an exothermic reaction unit 20. The heating element 12 is arranged in the endothermic reaction chamber 111 and connected to the boiler 33, so that the endothermic reaction chamber 111 absorbs the surplus heat of the boiler 33, and the reaction raw materials in the endothermic reaction chamber 111 absorb the surplus energy and convert it into chemical energy in the oxide, thereby recovering and storing the surplus heat of the boiler 33. The hot network water heater 40 is arranged in the oxide exothermic element 21 and the carbon capture element 22, so that the hot network water heater 40 uses the heat generated by the oxide exothermic element 21 and the carbon capture element 22 to heat the return water of the heating network, and converts the chemical energy in the oxide into heat to heat the return water of the heating network, so as to realize flexible thermal energy storage, respond to the deep peak regulation auxiliary service signal of the power grid, and increase the income. The flue gas inlet 223 of the carbon capture element 22 is connected with the flue gas outlet 31 of the boiler 33, and the carbon capture element 22 can also be used to capture carbon dioxide in the flue gas of the boiler 33. Therefore, the thermochemical heat storage carbon capture device combines carbon capture technology with thermochemical heat storage energy storage technology, and realizes both heat storage and carbon capture functions through a set of devices, thereby reducing engineering construction costs. This is of great significance to the flexibility transformation and low-carbon transformation of future thermal power plants.

[0029] The boiler 33 includes a heating boiler and a thermal power boiler of the thermal power unit 30 .

[0030] In this embodiment, the oxide can be any one or a combination of alkaline metal oxides such as calcium oxide, sodium oxide, magnesium oxide, potassium oxide, and lithium oxide; the carbonate can be any one or a combination of alkaline metal carbonates such as calcium carbonate, sodium carbonate, magnesium carbonate, potassium carbonate, and lithium carbonate; the hydroxide can be any one or a combination of alkaline metal hydroxide salts such as calcium hydroxide, sodium hydroxide, magnesium hydroxide, potassium hydroxide, and lithium hydroxide; the oxide in the exothermic reaction chamber 211 is mixed with water to produce an exothermic reaction, and the generated alkaline metal hydroxide (which can be any one or a combination of alkaline metal hydroxide salts such as calcium hydroxide, sodium hydroxide, magnesium hydroxide, potassium hydroxide, and lithium hydroxide) is supplied to the carbon capture element 22 to capture carbon dioxide in the flue gas.

[0031] like Figure 1 As shown, the heating element 12 includes a flue gas heat exchange element, which has a flue gas channel, which is connected to the flue gas pipe 36 of the boiler 33. The flue gas of the boiler 33 enters the flue gas channel through the flue gas pipe 36, so that the flue gas heat exchange element uses the waste heat of the flue gas to heat the endothermic reaction chamber 111.

[0032] like Figure 1As shown, the heating element 12 also includes an electric heating element 121, and the power supply of the electric heating element 121 comes from the peak-shaving and frequency-modulating surplus power of the thermal power unit 30 or the power grid. When the thermal power unit 30 adapts to the volatility and intermittency of renewable energy, the thermal power unit is peak-shaving and frequency-modulating, and the peak-shaving and frequency-modulating surplus power of the thermal power unit 30 or the power grid is provided to the electric heating element 121, so that the electric heating element 121 uses the surplus power to generate heat and heat the endothermic reaction chamber 111.

[0033] In this embodiment, the thermochemical heat storage carbon capture device further includes a first drying member, which has a first drying chamber, a liquid inlet of the first drying chamber is connected to the hydroxide outlet 213, a solid outlet of the first drying chamber is connected to the hydroxide inlet 222, and the first drying member is connected to the boiler 33 to heat the first drying chamber using the heat of the boiler 33. The first drying member is disposed in the first drying chamber and connected to the boiler 33, so that the first drying member can use the heat of the boiler 33 to dry the hydroxide in the first drying chamber, thereby reducing energy loss.

[0034] like Figure 2 As shown, the carbon capture element 22 includes a tank body 224, a spray pipe 225 and a flue gas pipe 226. The carbon capture chamber 221, the hydroxide inlet 222 and the flue gas inlet 223 are all arranged on the tank body 224. The spray pipe 225 is arranged in the carbon capture chamber 221. The inlet of the spray pipe 225 is connected to the hydroxide inlet 222. The spray pipe 225 has a plurality of spray heads 2251. The flue gas pipe 226 is arranged in the carbon capture chamber 221 and is located below the spray pipe 225. The inlet of the flue gas pipe 226 is connected to the flue gas inlet 223. The flue gas pipe 226 has a plurality of air holes 2261 connected to the carbon capture chamber 221. The carbon capture element 22 with the above structure has a certain hydroxide solution 227 stored in the tank 224, the flue gas pipe 226 is lower than the liquid level of the hydroxide solution 227, and the spray pipe 225 and the spray head 2251 are both higher than the liquid level of the hydroxide solution 227, so that the flue gas enters the carbon capture chamber 221 through the multiple air holes 2261, and the flue gas successively contacts the hydroxide solution 227 and the hydroxide solution sprayed by the spray head 2251, thereby improving the capture effect of the carbon capture element 22 on carbon dioxide in the flue gas.

[0035] like Figure 1As shown, the endothermic reaction element 11 includes a carbonate decomposition unit 114, the endothermic reaction chamber 111 includes a carbonate decomposition chamber of the carbonate decomposition unit 114, the reaction raw material inlet 112 includes a decomposition inlet of the carbonate decomposition unit 114, and the carbon capture element 22 also has a carbonate outlet, which is connected to the decomposition inlet of the carbonate decomposition unit 114. By adopting the above-mentioned carbonate decomposition unit 114, the carbonate product of the carbon capture element 22 can be used as a reaction raw material, and the oxide product of the carbonate decomposition unit 114 can be used as an oxide raw material of the oxide exothermic element 21, thereby saving the reaction raw material costs of the endothermic reaction element 11 and the oxide exothermic element 21.

[0036] In this embodiment, the thermochemical heat storage carbon capture device further includes a second drying member, which has a second drying chamber, a liquid inlet of the second drying chamber is connected to a carbonate outlet, a solid outlet of the second drying chamber is connected to a decomposition inlet of the carbonate decomposition unit 114, and the second drying member is connected to the boiler 33 to heat the second drying chamber using the heat of the boiler 33. The second drying member is disposed in the second drying chamber and connected to the boiler 33, so that the second drying member can absorb the heat of the boiler 33 to dry the carbonate in the second drying chamber, thereby reducing energy loss.

[0037] In this embodiment, the thermochemical heat storage carbon capture device further includes a carbon dioxide storage component, and the carbonate decomposition unit 114 has a carbon dioxide outlet connected to the carbonate decomposition chamber, and the carbon dioxide outlet is connected to the carbon dioxide storage component. The carbon dioxide product of the carbonate decomposition unit 114 is stored in the carbon dioxide storage component, which facilitates the unified treatment of carbon dioxide.

[0038] Specifically, the thermochemical heat storage carbon capture device also includes a cooling element, which is arranged between the carbon dioxide outlet and the carbon dioxide sealing element. After the carbon dioxide is cooled by the cooling element, the cooled carbon dioxide is stored in the carbon dioxide sealing element.

[0039] like Figure 1 As shown, the endothermic reaction element 11 further includes a hydroxide decomposition unit 115, the endothermic reaction chamber 111 further includes a hydroxide decomposition chamber of the hydroxide decomposition unit 115, the reaction raw material inlet 112 further includes a decomposition inlet of the hydroxide decomposition unit 115, and the hydroxide outlet 213 is connected to the decomposition inlet of the hydroxide decomposition unit 115. By adopting the above-mentioned hydroxide decomposition unit 115, the hydroxide product of the oxide exothermic element 21 can be used as a reaction raw material, and the oxide product of the hydroxide decomposition unit 115 can be used as an oxide raw material of the oxide exothermic element 21, thereby saving the reaction raw material costs of the endothermic reaction element 11 and the oxide exothermic element 21.

[0040] like Figure 1As shown, the heating element 12 also includes a steam extraction heat exchange element, the inlet of which is connected to the steam extraction outlet 32 ​​of the thermal power unit 30, and the steam extraction heat exchange element is used to heat the hydroxide decomposition chamber. The steam extraction outlet 32 ​​is connected to the steam extraction heat exchange element, and the steam extraction heat exchange element uses the waste heat of steam to heat the endothermic reaction chamber 111.

[0041] like Figure 1 As shown, the thermal power unit 30 includes a boiler 33, a steam turbine 34 and a generator 35. The flue gas duct 36 is the flue gas duct 36 of the boiler 33. The flue gas outlet 31 is arranged at the outlet of the flue gas duct 36. The flue gas heat exchanger is located in the middle of the flue gas duct 36 to reduce the flue gas temperature in the flue gas duct 36. The steam extraction outlet 32 ​​is arranged on the steam turbine 34, and the peak-shaving and frequency-regulating surplus power output port is arranged on the generator 35.

[0042] like Figure 3 As shown, an embodiment of the present invention provides a thermochemical thermal storage carbon capture method, which can be applied to the thermochemical thermal storage carbon capture device provided above, and the thermochemical thermal storage carbon capture method includes:

[0043] According to the heat storage demand of the grid-source load storage, the heat storage capacity of the endothermic reaction element 11 of the thermochemical heat storage carbon capture device and the capacity of the heating element 12 of the thermochemical heat storage carbon capture device are designed;

[0044] Design the capacity of the heat network water heater 40 of the thermochemical heat storage carbon capture device according to the heating demand of the thermal power unit 30 and external heat users;

[0045] According to the flue gas emission of the boiler 33, the capacity of the carbon capture element 22 of the thermochemical heat storage carbon capture device is designed;

[0046] The heat release of the oxide exothermic element 21 is designed according to the heat release of the carbon capture element 22 and the heat demand of the hot network water heater 40 so that the sum of the heat release of the carbon capture element 22 and the heat release of the oxide exothermic element 21 meets the heat demand of the hot network water heater 40.

[0047] The thermochemical thermal storage carbon capture method provided in this embodiment is applied, and according to the thermal storage energy storage demand of the internal source grid load storage of the power grid (including the flue gas waste heat of the boiler 33, the extraction steam waste heat of the steam turbine 34, and the peak-shaving and frequency-regulating surplus power of the generator 35 or the power grid), the heat storage capacity of the endothermic reaction element 11 of the thermochemical thermal storage carbon capture device and the capacity of the heating element 12 of the thermochemical thermal storage carbon capture device are designed, and according to the heating demand of the thermal power unit 30 and the external heat user, the capacity of the heat network water heater 40 of the thermochemical thermal storage carbon capture device is designed, so that the heat network water heater 40 0 generates hot water or steam to heat the return water of the heating network to meet the demand of the thermal power unit 30 itself or external heating. According to the flue gas emission of the boiler 33, the capacity of the carbon capture element 22 of the thermochemical heat storage carbon capture device is designed, and the heat release of the oxide heat release element 21 is designed according to the heat release of the carbon capture element 22 and the heat demand of the hot network water heater 40, so that the sum of the heat release of the carbon capture element 22 and the heat release of the oxide heat release element 21 meets the heat demand of the hot network water heater 40 (that is, the heating demand required by the thermal power unit 30 or external heat users).

[0048] In this embodiment, the reaction raw material of the carbonate decomposition unit 114 preferably uses the carbonate product of the carbon capture element 22. The carbon dioxide produced after the endothermic decomposition of the carbonate needs to be cooled and recovered and subjected to long-term carbon sealing. The reaction raw material of the hydroxide decomposition unit 115 preferably uses the hydroxide product of the oxide exothermic element 21. If the hydroxide required by the hydroxide decomposition unit 115 is insufficient, or the carbonate required by the carbonate decomposition unit 114 is insufficient, it is possible to consider purchasing carbonates or hydroxides to meet the circulation operation of the thermochemical heat storage carbon capture device of the present invention.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0051] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thermochemical heat storage carbon capture device, characterized in that: The thermochemical heat storage carbon capture device comprises: An endothermic reaction unit (10) comprises an endothermic reaction element (11) and a heating element (12), wherein the endothermic reaction element (11) has an endothermic reaction chamber (111) and a reaction material inlet (112) and an oxide outlet (113) which are in communication with the endothermic reaction chamber (111), and the heating element (12) is arranged in the endothermic reaction chamber (111), and the heating element (12) is connected to a boiler (33) so as to heat the endothermic reaction chamber (111) using the heat of the boiler (33); An exothermic reaction unit (20) comprises an oxide exothermic element (21), a carbon capture element (22) and a hot water network heater (40), wherein the oxide exothermic element (21) comprises an exothermic reaction chamber (211) and an oxide inlet (212) and a hydroxide outlet (213) connected to the exothermic reaction chamber (211), the oxide inlet (212) being connected to the oxide outlet (113), the carbon capture element (22) comprising a carbon capture chamber (221) and a hydroxide outlet (213) connected to the carbon capture chamber (221). An oxide inlet (222) and a flue gas inlet (223), the hydroxide inlet (222) being connected to the hydroxide outlet (213), the flue gas inlet (223) being connected to the flue gas outlet (31) of the boiler (33), the hot network water heater (40) being arranged in the oxide exothermic element (21) and the carbon capture element (22) to absorb heat generated by the oxide exothermic element (21) and the carbon capture element (22), and the hot network water heater (40) being used to heat return water of the heating network.

2. The thermochemical heat storage carbon capture device according to claim 1, characterized in that: The heating element (12) comprises a flue gas heat exchange element, wherein the flue gas heat exchange element has a flue gas channel, and the flue gas channel is connected to the flue gas pipeline (36) of the boiler (33).

3. The thermochemical heat storage carbon capture device according to claim 2, characterized in that: The heating element (12) further comprises an electric heating element (121), wherein the electric heating element (121) is arranged in the endothermic reaction chamber (111), and the electric heating element (121) is powered by surplus power from a thermal power unit (30) or a peak-shaving and frequency-regulating power grid.

4. The thermochemical heat storage carbon capture device according to claim 1, characterized in that: The thermochemical heat storage carbon capture device further comprises a first drying element, the first drying element having a first drying chamber, the liquid inlet of the first drying chamber being connected to the hydroxide outlet (213), the solid outlet of the first drying chamber being connected to the hydroxide inlet (222), and the first drying element being connected to the boiler (33) so as to heat the first drying chamber using the heat of the boiler (33); and / or, The carbon capture element (22) comprises a tank body (224), a spray pipe (225) and a flue gas pipe (226); the carbon capture chamber (221), the hydroxide inlet (222) and the flue gas inlet (223) are all arranged on the tank body (224); the spray pipe (225) is arranged in the carbon capture chamber (221); the inlet of the spray pipe (225) is connected to the hydroxide inlet (222); the spray pipe (225) has a plurality of spray heads (2251); the flue gas pipe (226) is arranged in the carbon capture chamber (221) and is located below the spray pipe (225); the inlet of the flue gas pipe (226) is connected to the flue gas inlet (223); and the flue gas pipe (226) has a plurality of air holes (2261) connected to the carbon capture chamber (221).

5. The thermochemical heat storage carbon capture device according to claim 1, characterized in that: The endothermic reaction element (11) comprises a carbonate decomposition unit (114), the endothermic reaction chamber (111) comprises a carbonate decomposition chamber of the carbonate decomposition unit (114), the reaction raw material inlet (112) comprises a decomposition inlet of the carbonate decomposition unit (114), and the carbon capture element (22) further comprises a carbonate outlet, and the carbonate outlet is in communication with the decomposition inlet of the carbonate decomposition unit (114).

6. The thermochemical heat storage carbon capture device according to claim 5, characterized in that: The thermochemical heat storage carbon capture device also includes a second drying element, the second drying element having a second drying chamber, the liquid inlet of the second drying chamber being connected to the carbonate outlet, the solid outlet of the second drying chamber being connected to the decomposition inlet of the carbonate decomposition unit (114), and the second drying element being connected to the boiler (33) so as to utilize the heat of the boiler (33) to heat the second drying chamber.

7. The thermochemical heat storage carbon capture device according to claim 5, characterized in that: The thermochemical heat storage carbon capture device also includes a carbon dioxide storage component, and the carbonate decomposition unit (114) has a carbon dioxide outlet communicated with the carbonate decomposition chamber, and the carbon dioxide outlet is communicated with the carbon dioxide storage component.

8. The thermochemical heat storage carbon capture device according to claim 1, characterized in that: The endothermic reaction element (11) further comprises a hydroxide decomposition unit (115), the endothermic reaction chamber (111) further comprises a hydroxide decomposition chamber of the hydroxide decomposition unit (115), the reaction raw material inlet (112) further comprises a decomposition inlet of the hydroxide decomposition unit (115), and the hydroxide outlet (213) is in communication with the decomposition inlet of the hydroxide decomposition unit (115).

9. The thermochemical heat storage carbon capture device according to claim 8, characterized in that: The heating element (12) further comprises a steam extraction heat exchange element, the inlet of which is connected to the steam extraction outlet (32) of the thermal power unit (30), and the steam extraction heat exchange element is used to heat the hydroxide decomposition chamber.

10. A thermochemical thermal storage carbon capture method, characterized in that: The thermochemical thermal storage carbon capture method can be applied to the thermochemical thermal storage carbon capture device according to any one of claims 1 to 9, and the thermochemical thermal storage carbon capture method comprises: According to the heat storage demand of the power grid source load storage, the heat storage capacity of the endothermic reaction element (11) of the thermochemical heat storage carbon capture device and the capacity of the heating element (12) of the thermochemical heat storage carbon capture device are designed; Designing the capacity of the heat network water heater (40) of the thermochemical heat storage carbon capture device according to the heating demand of the thermal power unit (30) and external heat users; Designing the capacity of the carbon capture element (22) of the thermochemical heat storage carbon capture device according to the flue gas emission of the boiler (33); The heat release of the oxide heat release element (21) is designed according to the heat release of the carbon capture element (22) and the heat demand of the hot network water heater (40), so that the sum of the heat release of the carbon capture element (22) and the heat release of the oxide heat release element (21) meets the heat demand of the hot network water heater (40).

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