SCR (Selective Catalytic Reduction) denitration agent pyrolysis device

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) denitration agent pyrolysis device which comprises a first barrel, a gas inlet pipe, a feeding pipe and a plurality of heating assemblies, and a first barrel of the first barrel is provided with a first sealing plate; the air inlet pipe is arranged on the first cylinder body and is used for conveying hot air into the first cylinder body; the feeding pipe is arranged on the air inlet pipe and used for conveying ammonium carbamate powder into the air inlet pipe, and the multiple heating assemblies are arranged in the first barrel at intervals in the axial direction of the first barrel. According to the invention, the high-temperature condition required in the traditional urea ammonia preparation process is avoided, so that the energy consumption cost of a denitration system is reduced, the problem of caking of ammonium carbamate in the denitration process is effectively avoided, and the risks of pipeline blockage and difficult decomposition are reduced. As the cost of ammonium carbamate is lower than that of urea, the operation cost of the whole denitration system can be reduced by using ammonium carbamate as the denitration agent. Compared with ammonia preparation by urea, the ammonia preparation efficiency of the method is improved by 6.0%-27.0%, the average ammonia preparation efficiency is improved by 15.50%, and the energy consumption is reduced by 45.0%-65.0%.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas denitration in coal-fired power plants, and in particular to an SCR denitrification agent pyrolysis device. Background Art

[0002] With growing awareness of environmental protection and the increasing demand for air pollution control, controlling NOx emissions from coal-fired power plants has become a key focus of environmental protection efforts. Selective catalytic reduction (SCR) flue gas denitrification technology is widely used in coal-fired power plants due to its proven effectiveness in controlling NOx emissions from coal-fired units. Urea, currently the most commonly used flue gas denitrification reducing agent, is a relatively mature and safe ammonia production process. However, the high temperature required to produce ammonia from urea increases the energy cost of the denitrification system.

[0003] In the related art, addressing the limitations of existing urea-ammonia production technology, the use of ammonium carbamate, an intermediate product in urea production, as the primary denitrification agent has been proposed, offering cost advantages. However, ammonium carbamate is prone to agglomeration during the selective catalytic denitrification of flue gas, leading to pipeline blockage and difficulty in decomposition. Summary of the Invention

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

[0005] To this end, an embodiment of the present invention provides an SCR denitrification agent pyrolysis device.

[0006] The SCR denitrification agent pyrolysis device of an embodiment of the present invention includes a first cylinder, an air intake pipe, a feed pipe and multiple heating components, the first cylinder has a first cylinder mouth and a second cylinder mouth opposite to each other along its axial direction, and the first cylinder mouth is provided with a first sealing plate; the air intake pipe is provided on the first cylinder for conveying hot air into the first cylinder; the feed pipe is provided on the air intake pipe for conveying ammonium carbamate powder into the air intake pipe, so that the hot air carries the ammonium carbamate powder into the first cylinder; multiple heating components are arranged in the first cylinder at intervals along the axial direction of the first cylinder, and the ammonium carbamate powder passes through the multiple heating components in turn and exchanges heat with the heating components and undergoes pyrolysis, and the carbon dioxide and ammonia generated by the pyrolysis are discharged through the second cylinder mouth of the first cylinder.

[0007] In some embodiments, two communicating frustum-conical guide cylinders are provided between two adjacent heating assemblies, and the two frustum-conical guide cylinders are coaxial with the first cylinder and are symmetrically arranged along the axial direction of the first cylinder.

[0008] In some embodiments, the heating assembly includes an electric heating element, an electric wire and a heat sink. The electric heating element is electrically connected to a power source via the electric wire. The heat sink is wrapped around the outer surface of the electric heating element to dissipate the heat generated by the electric heating element.

[0009] In some embodiments, the SCR denitrification agent pyrolysis device of the embodiment of the present invention includes a second cylinder, which is sleeved on the first cylinder and defines an annular space between the second cylinder and the first cylinder, and the second cylinder has a third cylinder mouth and a fourth cylinder mouth opposite to each other along its axial direction, and the third cylinder mouth is provided with a second sealing plate, and the fourth cylinder mouth is provided with a third sealing plate arranged at an interval from the first cylinder, and the annular space is connected with the second cylinder mouth of the first cylinder, and the second cylinder is provided with an outlet pipe connected with the annular space, and the outlet pipe is arranged adjacent to the second sealing plate.

[0010] In some embodiments, a plurality of first semicircular annular plates are provided in the annular space, the inner circumference of the first semicircular annular plates is connected to the outer circumference of the first cylinder, the outer circumference of the first semicircular annular plates is connected to the inner circumference of the second cylinder, and the plurality of first semicircular annular plates are spaced apart in the axial direction of the second cylinder to define a first serpentine channel extending along the axial direction of the second cylinder, the inlet of the first serpentine channel is connected to the second cylinder mouth, and the outlet of the first serpentine channel is connected to the air outlet pipe.

[0011] In some embodiments, the distance between two adjacent first semicircular ring plates in the axial direction of the second cylinder is 0.5 to 0.8 times the inner diameter of the first semicircular ring plate.

[0012] In some embodiments, the SCR denitrification agent pyrolysis device of the embodiment of the present invention includes a jacket, which is mounted on the second cylinder, and the jacket has a heat exchange chamber and a steam inlet and a water outlet connected to the heat exchange chamber. The steam inlet is used for superheated steam to enter the heat exchange chamber and indirectly exchange heat with the ammonia carbamate powder in the annular space. The superheated steam after heat exchange and cooling is condensed into water and discharged through the water outlet.

[0013] In some embodiments, the heat exchange chamber has a first inner wall and a second inner wall radially opposite to each other along the second cylinder, the first inner wall is arranged adjacent to the second cylinder, and a plurality of second semicircular ring plates are provided in the heat exchange chamber, the inner circumference of the second semicircular ring plate is connected to the first inner wall, and the outer circumference of the second semicircular ring plate is connected to the second inner wall, and the plurality of second semicircular ring plates are arranged at intervals in the axial direction of the second cylinder to define a second serpentine channel extending along the axial direction of the second cylinder, the inlet of the second serpentine channel is connected to the steam inlet, and the outlet of the second serpentine channel is connected to the water outlet.

[0014] In some embodiments, the distance between two adjacent second semicircular ring plates in the axial direction of the second cylinder is 0.1 to 0.25 times the inner diameter of the second semicircular ring plate.

[0015] In some embodiments, the superheated steam has a pressure of 0.5 MPa to 0.8 MPa and a temperature of 180° C. to 260° C.

[0016] The SCR denitrification agent pyrolysis device of the embodiment of the present invention avoids the high temperature conditions required in the traditional urea ammonia production process by directly pyrolyzing ammonium carbamate, thereby reducing the energy consumption cost of the denitrification system. By pyrolyzing ammonium carbamate, the present invention effectively avoids the problem of ammonium carbamate agglomeration during the denitrification process, reducing the risk of pipeline blockage and decomposition difficulties. The ammonia generated by pyrolysis can be directly used in the selective catalytic reduction (SCR) denitrification process to improve the denitrification efficiency. The pyrolysis process of ammonium carbamate is relatively safe, reducing the risk of accidents. Since the cost of ammonium carbamate is lower than that of urea, the use of ammonium carbamate as a denitrification agent can reduce the operating cost of the entire denitrification system. Compared with urea ammonia production, the ammonia production efficiency of the present invention is increased by 6.0% to 27.0%, an average increase of 15.50%, and energy consumption is reduced by 45.0% to 65.0%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an SCR denitrification agent pyrolysis device according to an embodiment of the present invention.

[0018] Figure 2 4 is a top view of an SCR denitrification agent pyrolysis device according to an embodiment of the present invention.

[0019] Figure 3 Schematic diagram of the structure of the heating component of the embodiment of the present invention.

[0020] Reference numerals:

[0021] 1. First cylinder; 101. First cylinder mouth; 102. Second cylinder mouth; 2. First sealing plate; 3. Air inlet pipe; 4. Feed pipe; 5. Heating assembly; 501. Electric heating element; 502. Electric wire; 503. Heat dissipation element; 6. Conical guide tube; 7. Second cylinder; 701. Third cylinder mouth; 702. Fourth cylinder mouth; 8. Annular space; 9. Second sealing plate; 10. Third sealing plate; 11. Air outlet pipe; 12. First semicircular ring plate; 13. First serpentine channel; 14. Jacket; 1401. Heat exchange chamber; 1402. Steam inlet; 1403. Water outlet; 1404. First inner wall; 1405. Second inner wall; 15. Second semicircular ring plate; 16. Second serpentine channel. DETAILED DESCRIPTION

[0022] The 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.

[0023] like Figures 1 to 3 As shown, the SCR denitrification agent pyrolysis device of the embodiment of the present invention includes a first cylinder 1, an air intake pipe 3, a feed pipe 4 and a plurality of heating components 5. The first cylinder 1 has a first cylinder port 101 and a second cylinder port 102 opposite to each other along its axial direction, and the first cylinder port 101 is provided with a first sealing plate 2. The air intake pipe 3 is provided on the first cylinder 1 for conveying hot air into the first cylinder 1, and the feed pipe 4 is provided on the air intake pipe 3 for conveying ammonium carbamate powder into the air intake pipe 3, so that the hot air carries the ammonium carbamate powder into the first cylinder 1. The plurality of heating components 5 are arranged in the first cylinder 1 at intervals along the axial direction of the first cylinder 1. The ammonium carbamate powder passes through the plurality of heating components 5 in sequence and exchanges heat with the heating components 5 and undergoes pyrolysis. The carbon dioxide and ammonia generated by the pyrolysis are discharged through the second cylinder port 102 of the first cylinder 1.

[0024] During use, the SCR denitrification agent pyrolysis device according to an embodiment of the present invention delivers ammonium carbamate powder into the intake pipe 3 via the feed pipe 4. Hot air enters the intake pipe 3 and mixes with the ammonium carbamate powder, carrying it into the first barrel 1. As the ammonium carbamate powder passes through the multiple heating elements 5, it exchanges heat with the heating elements 5, raising its temperature and undergoing a pyrolysis reaction, producing carbon dioxide and ammonia. The carbon dioxide and ammonia produced by the pyrolysis are discharged through the second barrel opening 102 of the first barrel 1.

[0025] The SCR denitrification agent pyrolysis device of the embodiment of the present invention avoids the high temperature conditions required in the traditional urea ammonia production process by directly pyrolyzing ammonium carbamate, thereby reducing the energy consumption cost of the denitrification system. By pyrolyzing ammonium carbamate, the present invention effectively avoids the problem of ammonium carbamate agglomeration during the denitrification process, reducing the risk of pipeline blockage and decomposition difficulties. The ammonia generated by pyrolysis can be directly used in the selective catalytic reduction (SCR) denitrification process to improve the denitrification efficiency. The pyrolysis process of ammonium carbamate is relatively safe, reducing the risk of accidents. Since the cost of ammonium carbamate is lower than that of urea, the use of ammonium carbamate as a denitrification agent can reduce the operating cost of the entire denitrification system. Compared with urea ammonia production, the ammonia production efficiency of the present invention is increased by 6.0% to 27.0%, an average increase of 15.50%, and energy consumption is reduced by 45.0% to 65.0%.

[0026] Optionally, the hot air temperature is 50°C to 60°C.

[0027] Optionally, the heating temperature of the heating component 5 is 150°C to 240°C.

[0028] In some embodiments, two communicating frustum-conical flow guide cylinders 6 are provided between two adjacent heating assemblies 5 . The two frustum-conical flow guide cylinders 6 are coaxial with the first cylinder 1 and are symmetrically arranged along the axial direction of the first cylinder 1 .

[0029] like Figure 1 As shown, the small openings of the two frustum guide cylinders 6 are connected, or the large openings of the two frustum guide cylinders 6 are connected. Each pair of frustum guide cylinders 6 is connected, allowing ammonium formate powder and hot air to flow between the heating components 5.

[0030] Specifically, the mixture of carbon dioxide and ammonia produced by thermal decomposition and some undecomposed ammonium carbamate powder enters the conical guide tube 6 and first flows in an expanding manner to extend its thermal decomposition residence time between the two heating components 5, and then flows in a contracting manner to ensure that the pyrolysis mixture enters the next stage preheating body after being cooled due to thermal decomposition between the two conical guide tubes 6 to ensure a constant and uniform flow rate.

[0031] Alternatively, the mixture of carbon dioxide and ammonia produced by thermal decomposition and some undecomposed ammonium carbamate powder enters the conical guide tube 6 and first undergoes a contraction flow to extend its thermal decomposition residence time between the two heating components 5, and then undergoes an expansion flow to ensure that the pyrolysis mixture enters the next stage preheating body after being cooled due to thermal decomposition between the two conical guide tubes 6 to ensure a constant and uniform flow rate.

[0032] In some embodiments, the heating component 5 includes an electric heating element 501, an electric wire 502 and a heat sink 503. The electric heating element 501 is electrically connected to the power supply through the electric wire 502, and the heat sink 503 is covered on the outer peripheral surface of the electric heating element 501 to dissipate the heat generated by the electric heating element 501.

[0033] like Figure 3 As shown, electric heating element 501 is connected to a power source via wire 502. When the power source is energized, electric heating element 501 generates heat due to its resistance. Heat sink 503, attached to the periphery of electric heating element 501, rapidly transfers the generated heat to the ammonium carbamate powder, heating it and causing a pyrolysis reaction. Ammonia and carbon dioxide produced by the pyrolysis are discharged through the second barrel opening 102 of the first barrel body 1, completing the pyrolysis process.

[0034] Heat sink 503 helps improve thermal efficiency because it can transfer the heat generated by electric heating element 501 to the ammonium carbamate powder more quickly. Due to the improved heat exchange efficiency, electric heating element 501 can reduce power input when reaching the required temperature for pyrolysis, thereby reducing energy consumption. The arrangement of electric heating element 501 and heat sink 503 can reduce localized heat concentration and reduce the risk of localized overheating. The heating power of electric heating assembly 5 can be controlled by adjusting the power supply voltage or current, making the pyrolysis process easier to control and manage.

[0035] For example, the electric heating element 501 uses a round core rod, which can be made of metal or non-metal materials. Metal materials include nickel-chromium alloy (Ni-Cr, such as Cr20Ni80), iron-chromium-aluminum alloy (such as FeCrAl), tungsten (W), and molybdenum (Mo); non-metal materials include silicon carbide (SiC), PTC ceramics (positive temperature coefficient ceramics), and graphite.

[0036] The heat sink 503 uses a heat storage body with a porous structure. Its core goal is to quickly dissipate heat. The heat sink can be made of metal materials such as copper (Cu), aluminum (Al) and silver (Ag); non-metallic materials can be graphene / carbon nanotubes, diamond and ceramics (AlN, BeO); composite materials can be aluminum-graphite composite materials and heat pipes (internal working fluid + copper shell), etc.

[0037] In some embodiments, the denitrification agent pyrolysis device of the present invention includes a second cylinder 7, which is sleeved on the first cylinder 1 and defines an annular space 8 between the second cylinder 7 and the first cylinder 1. The second cylinder 7 has a third cylinder opening 701 and a fourth cylinder opening 702 that are opposite to each other along its axial direction. The third cylinder opening 701 is provided with a second sealing plate 9, and the fourth cylinder opening 702 is provided with a third sealing plate 10 spaced apart from the first cylinder 1. The annular space 8 is connected to the second cylinder opening 102 of the first cylinder 1. The second cylinder 7 is provided with an outlet pipe 11 that is connected to the annular space 8, and the outlet pipe 11 is arranged adjacent to the second sealing plate 9.

[0038] After the ammonium carbamate powder is pyrolyzed by multiple heating assemblies 5 within the first barrel 1, the generated gases, such as ammonia and carbon dioxide, are discharged through the second barrel opening 102 of the first barrel 1. These gases then enter the annular space 8, which provides an additional contact and reaction area. An outlet pipe 11 is located near the second sealing plate 9, allowing the gases to be directed out of the device after passing through the annular space 8, ready for the subsequent SCR denitration process.

[0039] The annular space 8 provides an additional reaction zone for the gas, helping to further improve the purity and concentration of ammonia, thereby enhancing denitration efficiency. The second cylinder 7 helps reduce heat loss during the pyrolysis process, improving overall thermal efficiency. The annular space 8 helps distribute the gas more evenly before entering the outlet pipe 11, reducing the decrease in denitration efficiency caused by uneven airflow.

[0040] In some embodiments, a plurality of first semicircular annular plates 12 are disposed within the annular space 8. The inner circumference of the first semicircular annular plates 12 is connected to the outer circumference of the first cylinder 1, and the outer circumference of the first semicircular annular plates 12 is connected to the inner circumference of the second cylinder 7. The plurality of first semicircular annular plates 12 are spaced apart in the axial direction of the second cylinder 7 to define a first serpentine channel 13 extending along the axial direction of the second cylinder 7. The inlet of the first serpentine channel 13 is in communication with the second cylinder port 102 of the first cylinder 1, and the outlet of the first serpentine channel 13 is in communication with the air outlet pipe 11.

[0041] like Figure 2 As shown, after ammonium carbamate is pyrolyzed in the first barrel 1 by the heating assembly 5, the generated gas enters the annular space 8 through the second barrel opening 102 of the first barrel 1. Within the annular space 8, the gas passes through a first serpentine channel 13 formed by multiple first semicircular ring plates 12. These channels guide the gas in a serpentine path, increasing the contact area between the gas and the channel walls. Ultimately, the gas flows out of the outlet of the first serpentine channel 13 and is directed through the outlet pipe 11, ready to enter the SCR denitrification system.

[0042] The first serpentine channel 13 helps to break up the turbulence in the gas flow, making the gas flow more uniform and improving the denitrification efficiency. The flow characteristics of the first serpentine channel 13 help to buffer the pressure fluctuations in the gas flow and improve the stability of the entire system.

[0043] In some embodiments, the distance between two adjacent first semicircular annular plates 12 in the axial direction of the second cylinder 7 is 0.5 to 0.8 times the inner diameter of the first semicircular annular plate 12 .

[0044] The spacing between adjacent first serpentine channels 13 is set to a certain ratio of the inner diameter, i.e., 0.5 to 0.8 times. This range is intended to find a balance point so that the gas can flow effectively within the serpentine channel without generating excessive pressure loss. When the gas passes through the first serpentine channel 13, the spacing between adjacent first serpentine channels 13 affects the flow rate and turbulence of the gas. Appropriate spacing can promote heat exchange between the gas and the first serpentine channel 13 while avoiding excessive pressure loss and maintaining the stability of the gas flow.

[0045] In some embodiments, the denitrification agent pyrolysis device of the present invention includes a jacket 14, which is sleeved on the second cylinder 7. The jacket 14 has a heat exchange chamber 1401, a steam inlet 1402, and a water outlet 1403 connected to the heat exchange chamber 1401. The steam inlet 1402 is used for superheated steam to enter the heat exchange chamber 1401 for indirect heat exchange with the ammonia carbamate powder in the annular space 8. After heat exchange and cooling, the superheated steam condenses into water and is discharged through the water outlet 1403.

[0046] Specifically, if Figure 1As shown, superheated steam enters heat exchange chamber 1401 through steam inlet 1402. The superheated steam within heat exchange chamber 1401 indirectly exchanges heat with the ammonium carbamate powder within annular space 8. That is, the superheated steam transfers heat to the ammonium carbamate powder through the wall of jacket 14, without direct contact. During the heat exchange process, the superheated steam loses heat and condenses into water, which is then discharged through water outlet 1403.

[0047] Through the indirect heat exchange design of jacket 14, superheated steam can effectively transfer heat to the ammonia carbamate powder, improving heat exchange efficiency. The presence of jacket 14 helps maintain a stable temperature of the ammonia carbamate powder, reducing the impact of temperature fluctuations on the denitration process. The heat released by the condensation of superheated steam is absorbed by the ammonia carbamate powder, reducing the amount of heat required for external heating and thus reducing energy consumption. This effective heat transfer ensures a more thorough thermal decomposition reaction of the ammonia carbamate powder, improving denitration efficiency.

[0048] In some embodiments, the heat exchange chamber 1401 has a first inner wall 1404 and a second inner wall 1405 radially opposite each other along the second cylinder 7, with the first inner wall 1404 being located adjacent to the second cylinder 7. A plurality of second semi-circular annular plates 15 are disposed within the heat exchange chamber 1401. The inner circumferences of the second semi-circular annular plates 15 are connected to the first inner wall 1404, and the outer circumferences of the second semi-circular annular plates 15 are connected to the second inner wall 1405. The plurality of second semi-circular annular plates 15 are spaced apart in the axial direction of the second cylinder 7 to define a second serpentine channel 16 extending axially along the second cylinder 7. The inlet of the second serpentine channel 16 is connected to the steam inlet 1402, and the outlet of the second serpentine channel 16 is connected to the water outlet 1403.

[0049] Superheated steam enters the second serpentine passage 16 through steam inlet 1402. Flowing within the second serpentine passage 16, the steam exchanges heat with the second semicircular annular plate 15 and the walls of the heat exchange chamber 1401, transferring heat to the ammonia carbamate powder. As the heat is transferred, the superheated steam gradually condenses into water. The condensed water flows out of the outlet of the second serpentine passage 16 and is discharged through outlet 1403.

[0050] The second serpentine channel 16 increases the heat exchange area between the steam and the ammonia carbamate powder, thereby improving the heat exchange efficiency. The structure of the second serpentine channel 16 helps the steam maintain contact with the wall of the heat exchange chamber 1401 for a longer period of time while flowing in the channel, thereby optimizing the heat exchange effect. Through effective heat exchange, the amount of heat required for external energy heating is reduced, thereby reducing energy consumption. After the heat of the steam is absorbed by the ammonia carbamate powder, it helps to improve its pyrolysis efficiency, thereby improving the denitrification efficiency. Since the steam does not directly contact the ammonia carbamate powder, potential corrosion and wear are reduced, which may extend the service life of the equipment.

[0051] In some embodiments, the distance between two adjacent second semicircular annular plates 15 in the axial direction of the second cylinder 7 is 0.1 to 0.25 times the inner diameter of the second semicircular annular plate 15 .

[0052] The appropriate spacing between adjacent semicircular ring plates can optimize the heat exchange efficiency between the steam and the semicircular ring plates, ensuring that the steam can effectively transfer heat to the ammonia carbamate powder when passing through the serpentine channel. Reasonable setting of the spacing helps to reduce the pressure loss in the steam flow, ensuring that the steam can pass through the serpentine channel with lower energy consumption, thereby reducing the operating cost of the overall denitrification system. By adjusting the spacing between the semicircular ring plates, the flow rate of the steam can be controlled, making the heat exchange between the steam and the ammonia carbamate powder more sufficient and improving the heat exchange efficiency. By controlling the spacing between the semicircular ring plates, the turbulence of the steam flow can be controlled, making the steam flow more stable, which helps to improve the conversion efficiency of the denitrification agent and the overall denitrification effect.

[0053] In some embodiments, the pressure of the superheated steam is 0.5 MPa to 0.8 MPa, and the temperature is 180° C. to 260° C.

[0054] At pressures between 0.5 MPa and 0.8 MPa, superheated steam can achieve a high heat exchange efficiency, helping to transfer more heat to the ammonia carbamate powder, thereby improving the efficiency of the pyrolysis reaction. At temperatures between 180°C and 260°C, the pyrolysis reaction of the ammonia carbamate powder can be effectively promoted, thereby improving the conversion efficiency of the denitrifier and the overall denitrification effect. By setting the appropriate pressure and temperature, it is possible to ensure that the denitrifier pyrolysis unit has a high energy efficiency ratio during operation, thereby reducing energy consumption and operating costs. Within the appropriate pressure and temperature range, the phase change process and heat exchange process of the superheated steam are more stable, which helps to improve the stability and reliability of the entire denitrification system.

[0055] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An SCR denitrification agent pyrolysis device, characterized in that: include: a first cylinder, the first cylinder having a first cylinder opening and a second cylinder opening opposite to each other along its axial direction, the first cylinder opening being provided with a first sealing plate; an air intake pipe, the air intake pipe being provided on the first cylinder and being used for conveying hot air into the first cylinder; a feed pipe, the feed pipe being arranged on the air inlet pipe and being used for conveying ammonium carbamate powder into the air inlet pipe, so that hot air carries the ammonium carbamate powder into the first cylinder; Multiple heating components are arranged in the first cylinder at intervals along the axial direction of the first cylinder. Ammonium carbamate powder passes through the multiple heating components in sequence and exchanges heat with the heating components and undergoes pyrolysis. Carbon dioxide and ammonia generated by the pyrolysis are discharged through the second cylinder port of the first cylinder.

2. The SCR denitrification agent pyrolysis device according to claim 1, characterized in that: Two communicating frustum-cone flow guide cylinders are provided between two adjacent heating components. The two frustum-cone flow guide cylinders are coaxial with the first cylinder and are symmetrically arranged along the axial direction of the first cylinder.

3. The SCR denitrification agent pyrolysis device according to claim 1, characterized in that: The heating assembly includes an electric heating element, an electric wire and a heat sink. The electric heating element is electrically connected to a power source via the electric wire. The heat sink is coated on the outer peripheral surface of the electric heating element and is used to dissipate the heat generated by the electric heating element.

4. The SCR denitrification agent pyrolysis device according to claim 1, characterized in that: The invention comprises a second cylinder, which is sleeved on the first cylinder and defines an annular space between the second cylinder and the first cylinder. The second cylinder has a third cylinder mouth and a fourth cylinder mouth opposite to each other along its axial direction. The third cylinder mouth is provided with a second sealing plate, and the fourth cylinder mouth is provided with a third sealing plate spaced apart from the first cylinder. The annular space is communicated with the second cylinder mouth of the first cylinder. The second cylinder is provided with an air outlet pipe communicated with the annular space, and the air outlet pipe is arranged adjacent to the second sealing plate.

5. The SCR denitrification agent pyrolysis device according to claim 4, characterized in that: A plurality of first semicircular annular plates are provided in the annular space, the inner circumferential surface of the first semicircular annular plates is connected to the outer circumferential surface of the first cylinder, and the outer circumferential surface of the first semicircular annular plates is connected to the inner circumferential surface of the second cylinder. The plurality of first semicircular annular plates are spaced apart in the axial direction of the second cylinder to define a first serpentine channel extending along the axial direction of the second cylinder, the inlet of the first serpentine channel is connected to the second cylinder port of the first cylinder, and the outlet of the first serpentine channel is connected to the air outlet pipe.

6. The SCR denitrification agent pyrolysis device according to claim 5, characterized in that: The distance between two adjacent first semicircular ring plates in the axial direction of the second cylinder is 0.5 to 0.8 times the inner diameter of the first semicircular ring plate.

7. The SCR denitrification agent pyrolysis device according to claim 4, characterized in that: It includes a jacket, which is mounted on the second cylinder. The jacket has a heat exchange cavity and a steam inlet and a water outlet connected to the heat exchange cavity. The steam inlet is used for superheated steam to enter the heat exchange cavity and indirectly exchange heat with the ammonia carbamate powder in the annular space. The superheated steam after heat exchange and cooling is condensed into water and discharged through the water outlet.

8. The SCR denitrification agent pyrolysis device according to claim 7, characterized in that: The heat exchange chamber has a first inner wall and a second inner wall radially opposite to each other along the second cylinder, the first inner wall is arranged adjacent to the second cylinder, and a plurality of second semicircular ring plates are provided in the heat exchange chamber, the inner circumference of the second semicircular ring plate is connected to the first inner wall, and the outer circumference of the second semicircular ring plate is connected to the second inner wall, and the plurality of second semicircular ring plates are arranged at intervals in the axial direction of the second cylinder to define a second serpentine channel extending along the axial direction of the second cylinder, the inlet of the second serpentine channel is connected to the steam inlet, and the outlet of the second serpentine channel is connected to the water outlet.

9. The SCR denitrification agent pyrolysis device according to claim 8, characterized in that: The distance between two adjacent second semicircular ring plates in the axial direction of the second cylinder is 0.1 to 0.25 times the inner diameter of the second semicircular ring plate.

10. The SCR denitrification agent pyrolysis device according to claim 7, characterized in that: The pressure of the superheated steam is 0.5 MPa to 0.8 MPa, and the temperature is 180° C. to 260° C.

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