Pyrolysis apparatus with selective catalytic de- nox coupled with carbon capture

Abstract

The application discloses a pyrolysis device for selective catalytic denitration coupled with carbon capture, which comprises a shell and a disturbance tube, the shell has a thermal decomposition chamber and a carbon capture chamber, the thermal decomposition chamber is used for pyrolyzing ammonium carbamate powder and generating pyrolysis gas of carbon dioxide and ammonia, the shell has a slaked lime water inlet, a pyrolysis gas outlet and a solid outlet which are communicated with the carbon capture chamber, the slaked lime water inlet is used for slaked lime water to enter the carbon capture chamber to adsorb carbon dioxide in the pyrolysis gas discharged by the thermal decomposition chamber, one end of the disturbance tube extends into the carbon capture chamber, and a gas outlet hole is arranged on the outer peripheral wall of the disturbance tube, and the disturbance tube is used for disturbing slaked lime water solution in the carbon capture chamber. Compared with urea ammonia production, the ammonia production efficiency is increased by 6.4% to 27.2%, the average increase is 16.8%, the ammonia production energy consumption is reduced by 32% to 38.8%, meanwhile, the denitration efficiency of the mixed gas generated into a flue gas selective catalytic denitration reactor can be increased by 3.2% to 4%.

Description

Technical Field

[0001] This invention relates to the field of flue gas denitrification technology in coal-fired power plants, and specifically to a selective catalytic denitrification pyrolysis device coupled with carbon capture. Background Technology

[0002] In the SCR flue gas denitrification process, the choice of reducing agent is crucial. Currently, urea is the most commonly used reducing agent for flue gas denitrification. Urea-to-ammonia technology is relatively mature and safe, but it requires high-temperature conditions, which leads to high energy consumption costs for the denitrification system. In addition, carbon dioxide in the mixed gas (including air, carbon dioxide, and ammonia) produced during the traditional urea thermal decomposition process enters the flue gas denitrification system directly without treatment. It will compete with the reactants for adsorption on the catalyst surface, especially in high-concentration carbon dioxide environments, which will reduce denitrification efficiency.

[0003] In related technologies, to address the limitations of existing urea-to-ammonia technology, a method using ammonium carbamate, an intermediate product in urea production, as the main denitrification agent has been proposed, offering a cost advantage. However, ammonium carbamate is prone to agglomeration during selective catalytic denitrification of flue gas, leading to problems such as pipeline blockage and decomposition difficulties. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a selective catalytic denitrification pyrolysis device coupled with carbon capture.

[0006] The selective catalytic denitrification pyrolysis device with coupled carbon capture according to an embodiment of the present invention includes a shell and a disturbance tube. The shell has a pyrolysis chamber and a carbon capture chamber located below the pyrolysis chamber. The pyrolysis chamber is connected to the carbon capture chamber. The pyrolysis chamber is used to pyrolyze ammonium carbamate powder to generate pyrolysis gas containing carbon dioxide and ammonia. The shell has a quicklime water inlet, a pyrolysis gas outlet, and a solid outlet connected to the carbon capture chamber. The quicklime water inlet is used for quicklime water to enter the carbon capture chamber to adsorb carbon dioxide in the pyrolysis gas discharged from the pyrolysis chamber. The adsorbed pyrolysis gas is discharged through the pyrolysis gas outlet, and the precipitate generated by adsorption is discharged through the solid outlet. One end of the disturbance tube extends into the carbon capture chamber. The outer peripheral wall of the disturbance tube is provided with an air outlet. The disturbance tube is used to supply air into the carbon capture chamber to disturb the quicklime water solution in the carbon capture chamber.

[0007] In some embodiments, the selective catalytic denitrification pyrolysis device for coupled carbon capture according to the present invention further includes a plurality of heating cylinders and a plurality of pyrolysis cylinders, wherein the plurality of heating cylinders and the plurality of pyrolysis cylinders are alternately arranged along a first direction orthogonal to the height direction of the shell, wherein an electric heating component is provided inside the heating cylinder, wherein a first end of the pyrolysis cylinder extends from the top of the shell into the carbon capture chamber, and a second end of the pyrolysis cylinder is disposed outside the shell for the entry of ammonium carbamate powder.

[0008] In some embodiments, the heating cylinder includes a plurality of sub-heating cylinders arranged along a second direction, and the pyrolysis cylinder includes a plurality of sub-pyrolysis cylinders arranged along the second direction. The plurality of sub-heating cylinders correspond one-to-one with the plurality of sub-pyrolysis cylinders, and the second direction is orthogonal to the height direction of the shell and the first direction.

[0009] In some embodiments, the cross-section of the housing is square, and the cross-sections of the sub-heating cylinder and the sub-heating junction cylinder are both rectangular.

[0010] In some embodiments, the ratio of the height of the housing to the side length of the cross-section of the housing is (2.0-3.0):1.0.

[0011] In some embodiments, the ratio of the height of the pyrolysis chamber to the side length of the cross-section of the shell is (1.5-2.4):1.0.

[0012] In some embodiments, the residence time of ammonium carbamate powder in the thermal decomposition chamber is controlled to be 10s-15s, and the pyrolysis temperature in the thermal decomposition chamber is 120℃-160℃.

[0013] In some embodiments, the electric heating assembly includes a heating rod and a heat storage body. The heating rod is disposed inside the sub-heating cylinder and coaxially arranged with the sub-heating cylinder. An annular cavity is defined between the heating rod and the sub-heating cylinder, and the heat storage body fills the annular cavity.

[0014] In some embodiments, the number of disturbance tubes is multiple and they are arranged at intervals along the second direction. The distance between two adjacent disturbance tubes is (1 / 8-1 / 6) of the side length of the cross-section of the housing. The diameter of the air outlet is 2mm-3mm and the air outlet velocity is 20m / s-25m / s.

[0015] In some embodiments, the housing includes a base plate that is inclined relative to a horizontal plane, the disturbance tube is disposed on the base plate, and the solid outlet is disposed at the bottom end of the base plate.

[0016] In the selective catalytic denitrification pyrolysis device with coupled carbon capture according to this invention, the ammonium carbamate powder is first pyrolyzed in the thermal decomposition chamber above the shell, directly generating pyrolysis gas containing ammonia and carbon dioxide. This step utilizes the cost advantage of the raw materials. Subsequently, the mixed pyrolysis gas enters the carbon capture chamber below. At the same time, pressurized air is introduced into the chamber through the agitator tube, and microbubbles are formed in the air outlet holes on its outer peripheral wall. This effectively agitates the quicklime aqueous solution injected from the quicklime water inlet, greatly increasing the gas-liquid contact area and reaction mass transfer efficiency, allowing carbon dioxide to be rapidly and efficiently adsorbed and solidified to form carbonic acid. Calcium precipitation not only fundamentally eliminates the poisoning effect of carbon dioxide on subsequent SCR catalysts, ensuring denitrification efficiency, but also significantly alleviates the problems of solid products easily agglomerating and clogging pipes in traditional applications due to its disturbance effect. Finally, the pure ammonia gas mixture (mixed with disturbed air) is discharged from the pyrolysis gas outlet and directly enters the denitrification system, while the calcium carbonate precipitate is discharged from the solid outlet, realizing resource utilization. This coupled design simultaneously completes the preparation of reducing agent, removal of harmful impurities and enhancement of reaction process in a compact process, which reduces energy consumption and improves the economy and stability of system operation.

[0017] Compared with urea-to-ammonia production, this invention improves ammonia production efficiency by 6.4% to 27.2%, with an average improvement of 16.8%, and reduces ammonia production energy consumption by 32% to 38.8%. At the same time, the denitrification efficiency of the mixed gas entering the flue gas selective catalytic denitrification reactor can be improved by 3.2% to 4%. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the selective catalytic denitrification pyrolysis device with coupled carbon capture according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Sectional view of AA.

[0020] Figure 3 yes Figure 1 A cross-sectional view of BB.

[0021] 1. Shell; 101. Pyrolysis chamber; 102. Carbon collection chamber; 103. Quicklime water inlet; 104. Pyrolysis gas outlet; 105. Solid outlet; 106. Bottom plate; 2. Disturbance pipe; 201. Gas outlet; 3. Heating cylinder; 301. Sub-heating cylinder; 4. Pyrolysis cylinder; 401. Sub-pyrolysis cylinder; 5. Electric heating assembly; 501. Heating rod; 502. Heat storage body. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figures 1 to 3 As shown, the selective catalytic denitrification pyrolysis device with coupled carbon capture according to an embodiment of the present invention includes a shell 1 and a disturbance tube 2. The shell 1 has a pyrolysis chamber 101 and a carbon capture chamber 102 located below the pyrolysis chamber 101. The pyrolysis chamber 101 is connected to the carbon capture chamber 102. The pyrolysis chamber 101 is used to pyrolyze ammonium carbamate powder to generate pyrolysis gas containing carbon dioxide and ammonia. The shell 1 has a quicklime water inlet 103, a pyrolysis gas outlet 104, and a solid outlet 105 connected to the carbon capture chamber 102. The quicklime water inlet 103 allows quicklime water to enter the carbon capture chamber 102 to adsorb carbon dioxide from the pyrolysis gas discharged from the pyrolysis chamber 101. The adsorbed pyrolysis gas is discharged through the pyrolysis gas outlet 104, and the precipitate generated by adsorption is discharged through the solid outlet 105. One end of the disturbance pipe 2 extends into the carbon collection chamber 102. An air outlet 201 is provided on the outer peripheral wall of the disturbance pipe 2. The disturbance pipe 2 is used to supply air into the carbon collection chamber 102 to disturb the quicklime aqueous solution in the carbon collection chamber 102.

[0024] In the selective catalytic denitrification pyrolysis device with coupled carbon capture according to this embodiment of the invention, firstly, ammonium carbamate powder is pyrolyzed in the pyrolysis chamber 101 above the shell 1, directly generating pyrolysis gas containing ammonia and carbon dioxide. This step utilizes the cost advantage of the raw materials. Subsequently, the mixed pyrolysis gas enters the carbon capture chamber 102 below. At the same time, pressurized air is introduced into the chamber through the agitation pipe 2, and microbubbles are formed in the air outlet 201 on its outer peripheral wall. This effectively agitates the quicklime aqueous solution injected through the quicklime water inlet 103, greatly increasing the gas-liquid contact area and reaction mass transfer efficiency, allowing carbon dioxide to be rapidly and efficiently adsorbed and solidified. The formation of calcium carbonate precipitate not only fundamentally eliminates the poisoning effect of carbon dioxide on subsequent SCR catalysts, ensuring denitrification efficiency, but also significantly alleviates the drawbacks of solid products easily agglomerating and clogging pipes in traditional applications due to the disturbance effect. Finally, the pure ammonia gas mixture (mixed with disturbed air) is discharged from the pyrolysis gas outlet 104 and directly enters the denitrification system, while the calcium carbonate precipitate is discharged from the solid outlet 105, realizing resource utilization. This coupled design simultaneously completes the preparation of reducing agent, removal of harmful impurities and enhancement of reaction process in a compact process, which reduces energy consumption and improves the economy and stability of system operation.

[0025] Compared with urea-to-ammonia production, this invention improves ammonia production efficiency by 6.4% to 27.2%, with an average improvement of 16.8%, and reduces ammonia production energy consumption by 32% to 38.8%. At the same time, the denitrification efficiency of the mixed gas entering the flue gas selective catalytic denitrification reactor can be improved by 3.2% to 4%.

[0026] In some embodiments, the selective catalytic denitrification pyrolysis apparatus for coupled carbon capture according to this invention further includes a plurality of heating cylinders 3 and a plurality of pyrolysis cylinders 4. The plurality of heating cylinders 3 and the plurality of pyrolysis cylinders 4 are arranged alternately along a first direction orthogonal to the height direction of the housing 1. An electric heating assembly 5 is provided inside the heating cylinder 3. The first end of the pyrolysis cylinder 4 extends from the top of the housing 1 into the carbon capture chamber 102, and the second end of the pyrolysis cylinder 4 is located outside the housing 1 for the entry of ammonium carbamate powder. For example, the first direction is the length or width direction of the housing.

[0027] The heating cylinders 3 with multiple built-in electric heating components 5 provide a centralized and controllable local heat source for the adjacent pyrolysis cylinders 4, enabling ammonium carbamate powder to enter from the outside of the shell 1 through the second end of the pyrolysis cylinder 4 and achieve rapid, uniform, and complete pyrolysis in the path precisely fed into the carbon capture chamber 102. Compared with a single large heating chamber, this modular and distributed heating design not only significantly shortens the heat transfer distance and reduces overall heat loss, achieving on-demand energy supply and energy saving, but also effectively avoids side reactions or material sintering caused by local overheating, ensuring the quality and yield of ammonia generation. At the same time, the parallel arrangement of multiple pyrolysis cylinders 4 enables the system to continuously and stably process and supply ammonium carbamate raw materials, significantly improving the processing capacity and operating efficiency of the device. Thus, while ensuring efficient carbon capture and denitrification performance, it further enhances the economy, flexibility, and long-term operational reliability of the entire system.

[0028] In some embodiments, such as Figure 2 As shown, the heating cylinder 3 includes multiple sub-heating cylinders 301, which are arranged along the second direction. The pyrolysis cylinder 4 includes multiple sub-pyrolysis cylinders 401, which are arranged along the second direction. The multiple sub-heating cylinders 301 correspond one-to-one with the multiple sub-pyrolysis cylinders 401. The second direction is orthogonal to the height direction of the shell 1 and the first direction.

[0029] This "matrix" or "honeycomb" structural layout ensures that each sub-pyrolysis cylinder 401 is surrounded from the side by a corresponding sub-heating cylinder 301, forming countless independent and tightly coupled micro-pyrolysis units. This provides ammonium carbamate powder with ultimate "surface contact" heating, ensuring that heat can be transferred instantaneously and uniformly to every material, completely eliminating temperature gradients and heating dead zones that may exist in traditional heating methods. This not only greatly improves the rate and conversion efficiency of the pyrolysis reaction and ensures the stability and high quality of ammonia generation, but also enables precise temperature control of the entire pyrolysis surface by zone and level. It can flexibly adjust the heating power of each area according to actual working conditions to achieve optimal energy utilization efficiency. In addition, this modular matrix design allows the scale of the device to be linearly expanded by adding or removing the number of sub-units, greatly enhancing the system's scalability, ease of maintenance, and adaptability to different flue gas treatment volumes. It provides a solution for large-scale industrial applications that combines high efficiency, energy saving, and high flexibility.

[0030] In some embodiments, the cross-section of the housing 1 is square, and the cross-sections of the sub-heating cylinder 301 and the sub-heating junction cylinder are both rectangular.

[0031] This rectangular structure enables a seamless, compact array arrangement, maximizing the use of the valuable space inside the shell 1. This allows for the integration of more pyrolysis units within a limited volume, significantly improving the processing capacity per unit volume and ammonia production rate. More importantly, the rectangular sub-heating cylinder 301 provides a large-area, uniform "surface-to-surface" contact heating to adjacent rectangular sub-pyrolysis cylinders 401. Compared to the "line-to-surface" contact formed by a circular cross-section, this greatly increases the effective heat transfer area and the uniformity of heat transfer, ensuring that the ammonium carbamate powder is heated consistently within the pyrolysis cylinder 4. This avoids incomplete reactions or material sintering problems caused by uneven local temperatures. Thus, while improving pyrolysis efficiency and energy utilization, it also ensures the quality of the generated ammonia and the long-term stability of the system operation. This synergistic design in geometry is the key to achieving high performance, high efficiency, and high integration of the device.

[0032] In some embodiments, the ratio of the height of the shell 1 to the side length of its cross-section is (2.0-3.0):1.0. This specific height-to-diameter ratio design ensures that the pyrolysis chamber 101 has sufficient height to allow the ammonium carbamate powder to complete full pyrolysis during its descent, while providing reasonable vertical space for the carbon capture chamber 102 below. This allows the pyrolysis gas to have sufficient gas-liquid contact and reaction with the quicklime aqueous solution stirred by the disturbance tube 2. If the ratio is too low, the reaction space will be insufficient, which may lead to incomplete pyrolysis or a decrease in carbon dioxide adsorption efficiency. If the ratio is too high, it will increase equipment costs and gas flow resistance. Therefore, this optimized ratio ensures reaction efficiency while taking into account the compactness and economy of the equipment structure. This results in a highly efficient "pyrolysis-capture" reaction chain in the vertical direction, achieving a balance between maximizing space utilization, optimizing reaction efficiency, and rationalizing system costs. This is a key structural parameter to ensure the efficient and stable operation of the entire coupled process.

[0033] In some embodiments, the height ratio of the pyrolysis chamber 101 to the side length of the cross-section of the shell 1 is (1.5-2.4):1.0. This specific ratio ensures that the pyrolysis chamber 101 has sufficient vertical residence time, allowing the ammonium carbamate powder to be fully and uniformly heated by the matrix-arranged sub-heating cylinders 301 on both sides during its downward movement path, thereby achieving complete pyrolysis and maximizing ammonia yield. At the same time, this height range also forms an ideal volume ratio with the carbon capture chamber 102 below, avoiding energy waste and equipment redundancy caused by an excessively high pyrolysis chamber, or insufficient pyrolysis and residual solid raw materials in the product due to an excessively low pyrolysis chamber. Therefore, this precise geometric parameter design not only deepens and supplements the aforementioned overall height-to-diameter ratio optimization, but also directly focuses on improving reaction conversion efficiency and energy utilization, which is the core technical guarantee for ensuring that the entire system produces high-quality reducing agent ammonia with minimal energy consumption.

[0034] In some embodiments, the residence time of ammonium carbamate powder in the thermal decomposition chamber 101 is controlled to be 10s-15s, and the pyrolysis temperature in the thermal decomposition chamber 101 is 120℃-160℃.

[0035] First, this temperature range falls precisely within the "golden window" for the efficient decomposition of ammonium carbamate, ensuring that the reactants can be rapidly and completely decomposed into ammonia and carbon dioxide while avoiding side reactions or unnecessary energy consumption that may be caused by excessively high temperatures, thus aligning with the initial goal of energy conservation and consumption reduction. The precise residence time of 10 to 15 seconds is the "time guarantee" that ensures the powder obtains sufficient energy and completes the reaction at this temperature. It maximizes the utilization efficiency of the thermal decomposition chamber 101, achieving "instant in, out" material handling and effectively preventing agglomeration and sintering problems caused by excessive powder retention in the high-temperature zone, thus solving the persistent problem of pipe blockage at its source. Therefore, this dual precise control of temperature and time not only ensures high-efficiency, high-purity ammonia production, fundamentally guaranteeing the stable operation of the subsequent denitrification system, but also significantly reduces system energy consumption and equipment thermal stress through mild operating conditions, extending the service life of the device. This combination of key process parameters is crucial for the efficient, stable, and economical operation of this invention.

[0036] In some embodiments, the electric heating assembly 5 includes a heating rod 501 and a heat storage body 502. The heating rod 501 is disposed inside the sub-heating cylinder 301 and is coaxially arranged with the sub-heating cylinder 301. An annular cavity is defined between the heating rod 501 and the sub-heating cylinder 301, and the heat storage body 502 is filled in the annular cavity.

[0037] The coaxially arranged heating rod 501 serves as the core heat source, directly transferring heat to the heat storage body 502 within the annular cavity via the shortest radial distance. The heat storage body 502 (such as high-temperature resistant ceramic or metal heat storage material) acts as a "heat buffer" and "secondary distributor," rapidly absorbing and storing the heat energy generated by electricity, and then uniformly and stably radiating heat to the inner wall of the entire sub-heating cylinder 301. This provides the adjacent sub-pyrolysis cylinder 401 with an extremely uniform temperature and minimal temperature fluctuations—a "constant-temperature hot surface." This design completely overcomes the drawbacks of traditional electric heating elements, such as localized overheating and uneven temperature distribution, ensuring... The uniform heating of ammonium carbamate powder during pyrolysis avoids material sintering caused by hot spots or incomplete reaction caused by cold zones, thus significantly improving pyrolysis efficiency and ammonia quality. More importantly, the presence of the heat storage body 502 gives the heating system excellent thermal inertia. When external operating conditions fluctuate or the heating rod 501 operates intermittently, it can still continuously release heat to maintain a stable reaction temperature. This not only enhances adaptability to complex operating conditions, but also effectively reduces energy consumption and extends the service life of heating elements by reducing the frequent start-stop of the heating rod 501, achieving a balance between high efficiency, stability, and economy.

[0038] In some embodiments, the number of disturbance tubes 2 is multiple and they are arranged at intervals along the second direction. The distance between two adjacent disturbance tubes 2 is (1 / 8-1 / 6) of the side length of the cross-section of the housing 1. The diameter of the air outlet 201 is 2mm-3mm and the air outlet velocity of the air outlet 201 is 20m / s-25m / s.

[0039] This specific tube spacing ensures a uniform, dead-angle-free disturbance field across the entire cross-section of the carbon capture chamber, avoiding reaction dead zones caused by uneven disturbance. The combination of a 2mm-3mm micro-aperture and a high-speed airflow of 20m / s-25m / s allows for the tangential ejection of numerous high-kinetic-energy microbubbles from the sidewalls of the disturbance tubes. These bubbles, during their ascent, exert intense shearing and turbulence on the quicklime solution, creating turbulence that significantly increases the gas-liquid interface area and mass transfer coefficient, enabling rapid and complete absorption and solidification of carbon dioxide. Therefore, this precisely designed set of fluid dynamic parameters efficiently couples physical disturbance with chemical reaction, significantly shortening the time required for carbon dioxide absorption and reaction, improving carbon capture efficiency and system processing capacity, and effectively preventing the deposition and scaling of precipitates at the bottom or walls of the container. This ensures the long-term stability and reliability of the device, representing a core technological guarantee for achieving efficient carbon capture.

[0040] In some embodiments, the housing 1 includes a base plate 106, which is inclined relative to the horizontal plane, a disturbance tube 2 is disposed on the base plate 106, and a solid outlet 105 is disposed at the bottom end of the base plate 106.

[0041] like Figure 1 As shown, the inclined bottom plate 106 provides a natural, unpowered sliding channel for the calcium carbonate precipitate generated after the carbon capture reaction. When the high-speed gas flow injected into the agitation pipe 2 stirs the solution, the denser solid precipitate will settle and collect along the slope under the action of gravity, and finally be automatically discharged smoothly from the solid outlet 105 at the bottom. This design completely avoids the problems of blockage, cleaning difficulties and reduced agitation efficiency caused by the accumulation of precipitate at the bottom of the horizontal container, ensuring the continuous and efficient progress of the carbon capture reaction. At the same time, this self-flowing slag discharge method does not require additional scraping or conveying equipment, which not only simplifies the system structure, reduces manufacturing costs and energy consumption, but also significantly improves the automation level and long-term operational reliability of the device. It is the key structural design of this invention to achieve continuous process flow and convenient operation.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A selective catalytic denitrification pyrolysis device coupled with carbon capture, characterized in that, include: The shell (1) has a pyrolysis chamber (101) and a carbon capture chamber (102) located below the pyrolysis chamber (101). The pyrolysis chamber (101) is connected to the carbon capture chamber (102). The pyrolysis chamber (101) is used to pyrolyze ammonium carbamate powder to generate carbon dioxide and ammonia. The shell (1) has a quicklime water inlet (103), a pyrolysis gas outlet (104) and a solid outlet (105) connected to the carbon capture chamber (102). The quicklime water inlet (103) is used for quicklime water to enter the carbon capture chamber (102) to adsorb carbon dioxide in the pyrolysis gas discharged from the pyrolysis chamber (101). The adsorbed pyrolysis gas is discharged through the pyrolysis gas outlet (104), and the precipitate generated by adsorption is discharged through the solid outlet (105). A disturbance tube (2) is provided, one end of which extends into the carbon collection chamber (102). An air outlet (201) is provided on the outer peripheral wall of the disturbance tube (2). The disturbance tube (2) is used to supply air into the carbon collection chamber (102) to disturb the quicklime aqueous solution in the carbon collection chamber (102).

2. The selective catalytic denitrification pyrolysis device coupled with carbon capture according to claim 1, characterized in that, It also includes multiple heating cylinders (3) and multiple pyrolysis cylinders (4), the multiple heating cylinders (3) and multiple pyrolysis cylinders (4) are arranged alternately along a first direction orthogonal to the height direction of the shell (1), the heating cylinder (3) is provided with an electric heating component (5), the first end of the pyrolysis cylinder (4) extends from the top of the shell (1) into the carbon capture chamber (102), and the second end of the pyrolysis cylinder (4) is located outside the shell (1) for the entry of ammonium carbamate powder.

3. The selective catalytic denitrification pyrolysis device coupled with carbon capture according to claim 2, characterized in that, The heating cylinder (3) includes a plurality of sub-heating cylinders (301), which are arranged along a second direction. The pyrolysis cylinder (4) includes a plurality of sub-pyrolysis cylinders (401), which are arranged along the second direction. The plurality of sub-heating cylinders (301) correspond one-to-one with the plurality of sub-pyrolysis cylinders (401). The second direction is orthogonal to the height direction of the shell (1) and the first direction.

4. The selective catalytic denitrification pyrolysis device coupled with carbon capture according to claim 3, characterized in that, The shell (1) has a square cross-section, and the sub-heating cylinder (301) and the sub-heating junction cylinder have rectangular cross-sections.

5. The selective catalytic denitrification pyrolysis device coupled with carbon capture according to claim 4, characterized in that, The ratio of the height of the shell (1) to the side length of the cross section of the shell (1) is (2.0-3.0):1.

0.

6. The selective catalytic denitrification pyrolysis apparatus coupled with carbon capture according to claim 4, characterized in that, The ratio of the height of the pyrolysis chamber (101) to the side length of the cross-section of the shell (1) is (1.5-2.4):1.

0.

7. The selective catalytic denitrification pyrolysis apparatus coupled with carbon capture according to claim 4, characterized in that, The residence time of ammonium carbamate powder in the thermal decomposition chamber (101) is controlled to be 10s-15s, and the pyrolysis temperature in the thermal decomposition chamber (101) is 120℃-160℃.

8. The selective catalytic denitrification pyrolysis apparatus coupled with carbon capture according to claim 4, characterized in that, The electric heating assembly (5) includes a heating rod (501) and a heat storage body (502). The heating rod (501) is disposed inside the sub-heating cylinder (301) and is coaxially arranged with the sub-heating cylinder (301). An annular cavity is defined between the heating rod (501) and the sub-heating cylinder (301), and the heat storage body (502) is filled in the annular cavity.

9. The selective catalytic denitrification pyrolysis apparatus coupled with carbon capture according to claim 3, characterized in that, The number of disturbance tubes (2) is multiple and they are arranged at intervals along the second direction. The distance between two adjacent disturbance tubes (2) is (1 / 8-1 / 6) of the side length of the cross-section of the shell (1). The diameter of the air outlet (201) is 2mm-3mm and the air velocity of the air outlet (201) is 20m / s-25m / s.

10. The selective catalytic denitrification pyrolysis apparatus coupled with carbon capture according to claim 1, characterized in that, The housing (1) includes a base plate (106) which is inclined relative to the horizontal plane. The disturbance tube (2) is located on the base plate (106) and the solid outlet (105) is located at the bottom end of the base plate (106).

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