Desulfurization and denitrification integrated carbon capture system

Abstract

The invention provides a desulfurization and denitrification integrated carbon capture system which comprises a cooling tower, a desulfurization and denitrification unit, an absorption unit, a regeneration unit and a sealing unit, the cooling tower is provided with a cooling area, the desulfurization and denitrification unit is connected with a boiler and arranged in the cooling area, and the desulfurization and denitrification unit comprises a reactor, a circulation part and a heat exchange part. The reactor is connected with the boiler so that smoke exhausted by the boiler can be introduced into the reactor, the circulating part is connected with the reactor and the heat exchange part, the absorption unit is connected with the reactor so that the smoke can be received and carbon dioxide in the smoke can be absorbed through an absorbent, and the regeneration unit is connected with the absorption unit. And the sealing unit is connected with the regeneration unit and is used for sealing the gas exhausted by the regeneration unit, and the sealing unit is connected with the regeneration unit and is used for sealing the gas exhausted by the regeneration unit. According to the desulfurization and denitrification integrated carbon capture system, long-distance erection of a conveying pipeline is reduced, waste of cold energy and heat energy is avoided, and the overall efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and in particular to a carbon capture system integrating desulfurization and denitrification. Background Art

[0002] In recent years, the problem of air pollution has become increasingly serious, among which the emission of sulfides and nitrogen oxides is the key factor of air pollution. There are mainly the following methods for removing nitrogen oxides in industry: selective catalytic reduction method SCR, selective non-catalytic reduction method SNCR, selective non-catalytic reduction and selective catalytic reduction combined method SNCR-SCR, oxidative liquid absorption method, microbial method, activated carbon adsorption method, electron beam method, etc. Among them, the first three methods are currently widely used industrial methods in the world. However, these three methods each have their shortcomings. The SCR method is currently the most commonly used denitrification method, with high denitrification efficiency and low secondary pollution, but the equipment investment cost is large, catalysts are required, and the operation and maintenance costs are high; while the SNCR method has less investment and operation costs, but the denitrification efficiency is low. For sulfides (such as sulfur dioxide), the wet limestone-gypsum desulfurization process is mainly used for treatment, but it is very easy to form scaling and blockage in the desulfurization tower, that is, in the pipeline.

[0003] In the related art, the towers required for the carbon capture process include: denitrification tower, desulfurization tower, scrubber, absorption tower, regeneration tower, cooling tower and related equipment for connecting the tower circulation. However, the carbon capture process in the related art has many towers, resulting in a large footprint for the entire system. Adjacent towers are transported through pipelines, which have long pipeline installation distances and long material transportation time, and are prone to pipeline blockage, which in turn reduces overall efficiency. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention proposes a desulfurization and denitrification integrated carbon capture system, which integrates the desulfurization and denitrification unit with the cooling tower, reduces the long-distance installation of the transmission pipeline, avoids the waste of cold and heat, and improves the overall efficiency.

[0005] The integrated desulfurization and denitrification carbon capture system of the present invention comprises:

[0006] a cooling tower having a cooling zone;

[0007] A desulfurization and denitration unit, which is connected to the boiler and placed in the cooling zone, comprises a reactor, a circulation part and a heat exchange part, wherein the reactor is connected to the boiler so that the flue gas discharged from the boiler can pass into the reactor, and the circulation part is connected to the reactor so as to circulate the reactant in the reactor between the reactor and the circulation part.

[0008] The circulation element is connected to the heat exchange element so as to exchange heat with the heat or cold energy introduced into the heat exchange element;

[0009] An absorption unit, the absorption unit is connected to the reactor and is used to receive the flue gas and absorb the carbon dioxide in the flue gas using an absorbent;

[0010] A regeneration unit, wherein the regeneration unit is connected to the absorption unit so that the absorbent in the absorption unit absorbs carbon dioxide and then passes into the regeneration unit for absorbent regeneration;

[0011] A sealing unit is connected to the regeneration unit to seal the gas discharged from the regeneration unit.

[0012] The desulfurization and denitrification integrated carbon capture system of the present invention arranges the desulfurization and denitrification unit in the cooling tower, which not only reduces the overall footprint of the system, but also shortens the connection distance of equipment pipelines and reduces the heat dissipation load of heat preservation or cold preservation.

[0013] In some embodiments, the heat exchange element includes a first heat exchange part and a second heat exchange part, and the circulation element includes a first heat exchange tube and a second heat exchange tube, the first heat exchange tube is connected to the first heat exchange part, and the second heat exchange tube is connected to the second heat exchange part, the first heat exchange part is used to introduce cold air, and the second heat exchange part is used to introduce heat.

[0014] In some embodiments, the first heat exchange part has a cold inlet and a cold outlet, and the cold inlet is connected to the cooling tower so that the cold energy generated by the cooling tower can flow into the first heat exchange part through the cold inlet.

[0015] In some embodiments, the cooling tower includes a tower body and a cooling unit, wherein the cooling unit is connected to the tower body and located at the bottom of the tower body, and the cooling unit is connected to the cold energy outlet and the cold energy inlet for introducing cold energy into the first heat exchange part.

[0016] In some embodiments, the cooling unit includes a plurality of cooling side walls, which are arranged at intervals along the circumference of the tower body, and a cooling gap is defined between two adjacent cooling side walls to facilitate outside air to enter the tower body through the cooling gap. The cooling side wall has a cavity, and a cooling coil is arranged in the cavity. The cooling coil is used to pass a cooling medium. The inlet and outlet of the cooling coil are respectively connected to the cold outlet and the cold inlet. The cooling medium circulates between the cooling coil and the first heat exchange part to be used for heat exchange in the first heat exchange tube in the first heat exchange part.

[0017] In some embodiments, the second heat exchange part has a heat inlet and a heat outlet, the heat inlet is connected to the regeneration outlet of the regeneration tower, and the heat outlet is connected to the sealing unit, so that the regeneration gas discharged from the regeneration outlet of the regeneration tower enters the second heat exchange part through the heat inlet, and after heat exchange with the second heat exchange tube in the second heat exchange part, enters the sealing unit through the heat outlet for sealing.

[0018] In some embodiments, the second heat exchange part has a second heat inlet and a second heat outlet, the second heat inlet is connected to the outlet of the boiler, and the second heat outlet is connected to the cooler, so that the flue gas discharged from the boiler enters the second heat exchange part through the second heat inlet, and after heat exchange with the second heat exchange tube in the second heat exchange part, enters the cooler through the second heat outlet.

[0019] In some embodiments, it also includes a first control valve and a second control valve, wherein the first control valve is installed at the cold inlet to control the flow rate of the cold inlet, and the second control valve is installed at the heat inlet to control the flow rate of the heat inlet.

[0020] In some embodiments, the integrated desulfurization and denitrification carbon capture system of the present invention also includes an absorbent heat exchanger, which is connected to both the absorption tower and the regeneration tower, so that the saturated absorbent discharged from the absorption tower and the regenerated absorbent discharged from the regeneration tower are respectively passed into the regeneration tower and the absorption tower after heat exchange in the absorbent heat exchanger.

[0021] In some embodiments, a cooling element is further provided on the pipeline connecting the absorbent heat exchanger and the regeneration tower, and the cooling element is connected to the cooling tower so that the cooling tower can pass cold energy into the cooling element. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a carbon capture system integrating desulfurization and denitrification according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 100. Boiler,

[0025] 1. Cooling tower,

[0026] 2. Desulfurization and denitrification unit, 21. Reactor, 22. Circulation element, 221. First heat exchange tube, 222. Second heat exchange tube, 23. Heat exchange element, 231. First heat exchange part, 232. Second heat exchange part,

[0027] 3. Absorption unit,

[0028] 4. Regeneration unit,

[0029] 5. Storage unit,

[0030] 6. Absorbent heat exchanger,

[0031] 7. Cooling parts. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] like Figure 1 As shown, the desulfurization and denitrification integrated carbon capture system of the present invention comprises: a cooling tower 1, a desulfurization and denitrification unit 2, an absorption unit 3, a regeneration unit 4, a sealing unit 5,

[0034] The cooling tower 1 has a cooling zone. The desulfurization and denitrification unit 2 is connected to the boiler 100 and is placed in the cooling zone. The desulfurization and denitrification unit 2 includes a reactor 21, a circulation part 22 and a heat exchanger 23. The reactor 21 is connected to the boiler 100 so that the flue gas discharged from the boiler 100 can be passed into the reactor 21. The circulation part 22 is connected to the reactor 21 to circulate the reactants in the reactor 21 between the reactor 21 and the circulation part 22. The circulation part 22 is connected to the heat exchanger 23 to exchange heat with the heat or cold passed into the heat exchanger 23. The absorption unit 3 is connected to the reactor 21 to receive the flue gas and use the absorbent to treat the carbon dioxide in the flue gas. The regeneration unit 4 is connected to the absorption unit 3 so that the absorbent in the absorption unit 3 absorbs carbon dioxide and then passes into the regeneration unit 4 for absorbent regeneration. The sealing unit 5 is connected to the regeneration unit 4 to seal the gas discharged from the regeneration unit 4.

[0035] Specifically, Figure 1 As shown, the internal space of the cooling tower 1 is the cooling zone. The reactor 21 is used to perform desulfurization and denitrification reactions to remove sulfur dioxide and nitrogen oxides in the flue gas. The circulation part 22 circulates the reactants (such as limestone slurry or urea solution) between the reactor 21 and the circulation part 22 to ensure uniform distribution and effective reaction of the reactants. The heat exchanger 23 is connected to the circulation part 22 and is used to exchange heat with the reactants in the circulation part 22 to keep the reactants within a suitable temperature range.

[0036] The absorption unit 3 is used to receive flue gas and absorb pollutants in the flue gas using an absorbent (such as an alkaline solution or an organic amine solution) to reduce harmful gas emissions. The regeneration unit 4 is connected to the absorption unit 3 to recover and regenerate the absorbent after the reaction with the flue gas so that it can be reused. That is, the reacted absorbent is passed into the regeneration unit 4 and subjected to a heating reaction so that the absorbent releases carbon dioxide, and then the absorbent is restored to a usable state by cooling to achieve the reuse of the absorbent. The sealing unit 5 is connected to the regeneration unit 4 and is used to seal the gas discharged from the regeneration unit 4. Usually, these gases contain carbon dioxide and need to be safely stored or further processed.

[0037] It is understandable that after a series of treatments such as desulfurization, denitrification, absorption and regeneration, the flue gas can meet the emission standards, while realizing the recycling of resources and reducing the impact on the environment. The cooling area in the cooling tower 1 provides the necessary cooling environment for the flue gas, which helps to improve the desulfurization and denitrification efficiency and reduce the energy consumption of the system.

[0038] In other words, the desulfurization and denitrification integrated carbon capture system of the present invention sets the desulfurization and denitrification unit 2 in the cooling tower 1, which not only reduces the overall footprint of the system, but also shortens the connection distance of equipment pipelines and reduces the heat dissipation load of thermal insulation or cooling.

[0039] In some embodiments, the heat exchange element 23 includes a first heat exchange part 231 and a second heat exchange part 232, and the circulation element 22 includes a first heat exchange tube 221 and a second heat exchange tube 222. The first heat exchange tube 221 is connected to the first heat exchange part 231, and the second heat exchange tube 222 is connected to the second heat exchange part 232. The first heat exchange part 231 is used to introduce cold air, and the second heat exchange part 232 is used to introduce heat.

[0040] Specifically, Figure 1 As shown, the first heat exchange part 231 and the second heat exchange part 232 are arranged in sequence along the direction of flue gas flow, and the first heat exchange part 231 is located above the second heat exchange part 232. Heat exchange pumps are provided on the first heat exchange tube 221 and the second heat exchange tube 222 to extract the reaction solution in the reactor 21 respectively.

[0041] It can be understood that the flue gas discharged from the boiler 100 is passed into the bottom of the reactor 21. In the reactor 21, the flue gas flows from bottom to top, and the reaction solution is passed into the first heat exchange tube 221 and the second heat exchange tube 221, so that the reaction solution is passed into the reactor 21 to react with the flue gas, thereby removing sulfur dioxide and nitrogen oxides in the flue gas (i.e., achieving denitrification and desulfurization of the flue gas).

[0042] It should be noted that the denitration reaction temperature is generally 300-400° C. The desulfurization reaction temperature is generally 100-160° C. In order to ensure the reaction temperature, the temperature of the reaction solution in the first heat exchange tube 221 and the second heat pipe needs to be controlled respectively to avoid the temperature rising during the reaction process and affecting the reaction effect.

[0043] In some embodiments, the first heat exchange part 231 has a cold inlet and a cold outlet, and the cold inlet is connected to the cooling tower 1 so that the cold energy generated by the cooling tower 1 can flow into the first heat exchange part 231 through the cold inlet.

[0044] It is understandable that the cooling tower 1 can be an air-cooled tower or a water-cooled tower. The outside air entering the cooling tower 1 can cool the heat exchange medium, and then the heat exchange medium is used to cool the first heat exchange part 231.

[0045] Optionally, the cooling tower 1 includes a tower body and a cooling unit, the cooling unit is connected to the tower body and is located at the bottom of the tower body, and the cooling unit is connected to a cold energy outlet and a cold energy inlet for introducing cold energy into the first heat exchange part 231 .

[0046] It can be understood that the cooling tower 1 is an air-cooled tower, and the outside air exchanges heat with the cooling unit through the bottom of the cooling tower 1, so that the temperature of the cooling medium in the cooling unit is reduced to the ambient temperature, and then the cooling medium is passed into the first cooling part to facilitate indirect heat exchange in the first heat exchange pipe 221.

[0047] In some embodiments, the cooling unit includes a plurality of cooling side walls, which are arranged at intervals along the circumference of the tower body, and a cooling gap is defined between two adjacent cooling side walls to facilitate external air to enter the tower body through the cooling gap. The cooling side wall has a cavity, and a cooling coil is arranged in the cavity. The cooling coil is used to pass a cooling medium. The inlet and outlet of the cooling coil are respectively connected to the cold outlet and the cold inlet. The cooling medium circulates between the cooling coil and the first heat exchange part 231 to be used for heat exchange in the first heat exchange tube 221 in the first heat exchange part 231.

[0048] It is understandable that the outside air enters the cooling tower 1 through the cooling gap and exchanges heat with the cooling side walls on both sides of the cooling gap, so that the temperature of the cooling coil located in the cooling side walls is reduced and close to the ambient temperature. The cooling medium after heat exchange in the first cooling tube is passed into the first heat exchange part 231 and then exchanges heat with the first heat exchange tube 221, thereby achieving the cooling of the first heat exchange tube 221.

[0049] In some embodiments, the second heat exchange section 232 has a heat inlet and a heat outlet. The heat inlet is connected to the regeneration outlet of the regeneration tower, and the heat outlet is connected to the sealing unit 5, so that the regeneration gas discharged from the regeneration outlet of the regeneration tower enters the second heat exchange section 232 through the heat inlet, and after heat exchange with the second heat exchange tube 222 in the second heat exchange section 232, it enters the sealing unit 5 through the heat outlet for sealing.

[0050] It is understandable that the regenerated gas discharged from the regeneration tower still has a certain amount of heat, and the heat of the regenerated gas is used to heat the second heat exchange tube 222 in the second heat exchange part 232, which not only reduces the temperature of the heat exchange medium in the second heat exchange tube 222, but also facilitates the subsequent treatment and sealing of the regenerated gas. In addition, the heat in the regenerated gas is recovered by using the regenerated gas to exchange heat with the second heat exchange tube 222, that is, used to heat other processes or media, and improves energy utilization efficiency.

[0051] In some embodiments, the second heat exchange part 232 has a second heat inlet and a second heat outlet, the second heat inlet is connected to the outlet of the boiler 100, and the second heat outlet is connected to the cooler, so that the flue gas discharged from the boiler 100 enters the second heat exchange part 232 through the second heat inlet, and after heat exchange with the second heat exchange tube 222 in the second heat exchange part 232, enters the cooler through the second heat outlet.

[0052] It is understandable that if Figure 1 As shown, the boiler 100 burns fuel to generate high-temperature flue gas, which contains heat and is a potential source of heat energy. The outlet of the boiler 100 is connected to the second heat inlet of the second heat exchange part 232, and the flue gas is introduced into the second heat exchange part 232 so that the flue gas exchanges heat with the second heat exchange tube 222 in the second heat exchange part 232.

[0053] That is to say, the flue gas discharged from the boiler 100 is heat exchanged with the second heat exchange tube 222 in the second heat exchange part 232, and the heat in the flue gas is recovered, which can be used to heat other processes or media to improve energy utilization efficiency. The flue gas is heat exchanged with the second heat exchange tube 222, so that the temperature of the flue gas is reduced after the heat is released, which is beneficial to subsequent processing and discharge. The flue gas with reduced temperature is further cooled by the cooler, which reduces thermal pollution to the environment and is also beneficial to the control of pollutants in the flue gas.

[0054] It should be noted that the integrated desulfurization and denitrification carbon capture system of the present invention can be controlled according to the temperature of the heat exchange medium in the second heat exchange tube 222, that is, if the heat exchange medium in the second heat exchange tube 222 needs to be heated, the flue gas can be used to heat the second heat exchange tube 222; if the heat exchange medium in the second heat exchange tube 222 needs to be cooled, the regenerated gas can be used to heat the second heat exchange tube 222.

[0055] In some embodiments, the integrated desulfurization and denitrification carbon capture system of the present invention also includes a first control valve and a second control valve. The first control valve is installed at the cold inlet to control the flow rate of the cold inlet, and the second control valve is installed at the heat inlet to control the flow rate of the heat inlet.

[0056] It can be understood that there are two second control valves, one of which is installed at the first heat inlet and the other is installed at the second heat inlet, so as to control the flow rates of the first heat inlet and the second heat inlet respectively.

[0057] In some embodiments, the integrated desulfurization and denitrification carbon capture system of the present invention also includes an absorbent heat exchanger 6, which is connected to both the absorption tower and the regeneration tower, so that the saturated absorbent discharged from the absorption tower and the regenerated absorbent discharged from the regeneration tower are respectively passed into the regeneration tower and the absorption tower after heat exchange in the absorbent heat exchanger 6.

[0058] It is understandable that if Figure 1 As shown, the saturated absorbent after reacting with the flue gas in the absorption tower is passed into the heat exchanger and exchanges heat with the regenerated absorbent discharged from the regeneration tower, so that the temperature of the saturated absorbent increases, which is beneficial to the regeneration of the saturated absorbent, and the temperature of the regenerated absorbent decreases, which is beneficial to the re-reaction of the regenerated absorbent with the flue gas. This not only realizes the reuse of the absorbent, but also improves the conditions for better reaction of the absorbent in the regeneration tower and the absorption tower.

[0059] In some embodiments, a cooling element 7 is further provided on the pipeline connecting the absorbent heat exchanger 6 and the regeneration tower. The cooling element 7 is connected to the cooling tower 1 so that the cooling tower 1 can pass cold energy into the cooling element 7 .

[0060] It is understandable that the cooling element 7 can be used to cool the regeneration gas discharged from the regeneration tower to facilitate the subsequent sealing and other treatments of the regeneration gas.

[0061] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A carbon capture system integrating desulfurization and denitrification, characterized in that: include: a cooling tower having a cooling zone; A desulfurization and denitration unit, which is connected to the boiler and placed in the cooling zone, comprises a reactor, a circulation part and a heat exchange part, wherein the reactor is connected to the boiler so that the flue gas discharged from the boiler can pass into the reactor, and the circulation part is connected to the reactor so as to circulate the reactant in the reactor between the reactor and the circulation part. The circulation element is connected to the heat exchange element so as to exchange heat with the heat or cold energy introduced into the heat exchange element; An absorption unit, the absorption unit is connected to the reactor and is used to receive the flue gas and absorb the carbon dioxide in the flue gas using an absorbent; A regeneration unit, wherein the regeneration unit is connected to the absorption unit so that the absorbent in the absorption unit absorbs carbon dioxide and then passes into the regeneration unit for absorbent regeneration; A sealing unit is connected to the regeneration unit to seal the gas discharged from the regeneration unit.

2. The integrated desulfurization and denitrification carbon capture system according to claim 1, characterized in that: The heat exchange element includes a first heat exchange part and a second heat exchange part, and the circulation element includes a first heat exchange tube and a second heat exchange tube, the first heat exchange tube is connected to the first heat exchange part, and the second heat exchange tube is connected to the second heat exchange part, the first heat exchange part is used to introduce cold air, and the second heat exchange part is used to introduce heat.

3. The integrated desulfurization and denitrification carbon capture system according to claim 2, characterized in that: The first heat exchange part has a cold inlet and a cold outlet, and the cold inlet is connected to the cooling tower so that the cold energy generated by the cooling tower can flow into the first heat exchange part through the cold inlet.

4. The integrated desulfurization and denitrification carbon capture system according to claim 3, characterized in that: The cooling tower includes a tower body and a cooling unit, wherein the cooling unit is connected to the tower body and is located at the bottom of the tower body, and the cooling unit is connected to the cold energy outlet and the cold energy inlet to introduce cold energy into the first heat exchange part.

5. The integrated desulfurization and denitrification carbon capture system according to claim 4, characterized in that: The cooling unit includes a plurality of cooling side walls, which are arranged at intervals along the circumference of the tower body, and a cooling gap is defined between two adjacent cooling side walls so that outside air can enter the tower body through the cooling gap. The cooling side wall has a cavity, and a cooling coil is arranged in the cavity. The cooling coil is used to pass a cooling medium. The inlet and outlet of the cooling coil are respectively connected to the cold outlet and the cold inlet. The cooling medium circulates between the cooling coil and the first heat exchange part to be used for heat exchange in the first heat exchange tube in the first heat exchange part.

6. The integrated desulfurization and denitrification carbon capture system according to any one of claims 2 to 5, characterized in that: The second heat exchange part has a first heat inlet and a first heat outlet, the first heat inlet is connected to the regeneration outlet of the regeneration tower, and the first heat outlet is connected to the sealing unit, so that the regeneration gas discharged from the regeneration outlet of the regeneration tower enters the second heat exchange part through the first heat inlet, and after heat exchange with the second heat exchange tube in the second heat exchange part, enters the sealing unit through the first heat outlet for sealing.

7. The integrated desulfurization and denitrification carbon capture system according to claim 6, characterized in that: The second heat exchange part has a second heat inlet and a second heat outlet, the second heat inlet is connected to the outlet of the boiler, and the second heat outlet is connected to the cooler, so that the flue gas discharged from the boiler enters the second heat exchange part through the second heat inlet, and after heat exchange with the second heat exchange tube in the second heat exchange part, enters the cooler through the second heat outlet.

8. The integrated desulfurization and denitrification carbon capture system according to claim 7, characterized in that: It also includes a first control valve and a second control valve. The first control valve is installed at the cold inlet to control the flow rate of the cold inlet. The second control valve is installed at the heat inlet to control the flow rate of the heat inlet.

9. The integrated desulfurization and denitrification carbon capture system according to claim 1, characterized in that: It also includes an absorbent heat exchanger, which is connected to both the absorption tower and the regeneration tower, so that the saturated absorbent discharged from the absorption tower and the regenerated absorbent discharged from the regeneration tower are respectively introduced into the regeneration tower and the absorption tower after heat exchange in the absorbent heat exchanger.

10. The integrated desulfurization and denitrification carbon capture system according to claim 9, characterized in that: A cooling element is also provided on the pipeline connecting the absorbent heat exchanger and the regeneration tower, and the cooling element is connected to the cooling tower so that the cooling tower can pass cold energy into the cooling element.

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