An anti-blocking and resistance-reducing SCR denitrification device

Abstract

The present invention proposes an anti-blocking and drag-reducing SCR denitration device, comprising a housing, multiple catalyst layers and multiple drive components, wherein an air inlet is provided at the top of the housing, an air outlet is provided at the bottom of the housing, the multiple catalyst layers are arranged in the housing in sequence in a vertical direction, each catalyst layer is rotatably connected to the inner wall of the housing, the multiple drive components are driven and connected to the multiple catalyst layers in a one-to-one correspondence, and each catalyst layer can rotate in a vertical direction under the drive of the corresponding drive component. The present invention can effectively improve the denitration efficiency and extend the service life of the catalyst.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas denitration, and in particular to an anti-blocking and resistance-reducing SCR denitration device. Background Art

[0002] Nitrogen oxides (NOx) are one of the important pollutants in the atmosphere. NOx emissions have brought great harm to human production and life as well as the natural environment, and can cause air pollution problems such as acid rain, acid mist, and photochemical smog. With the development of my country's economy, NOx emission standards have become increasingly stringent, and efficient and comprehensive NOx control technologies are urgently needed.

[0003] Selective catalytic reduction (SCR) is the most widely used flue gas denitrification technology in the world. 3 ) as a reducing agent to selectively reduce NOx into nitrogen and water. Since the SCR catalyst reaction chamber is mostly arranged in a vertical airflow, the catalyst is fixed in the reactor in three or four layers. The first layer of catalyst is affected by fly ash and SO in the flue gas. 2 The impact is relatively large, especially in some non-electric industries, such as the cement industry, where the flue gas contains a large amount of dust and has complex components. The first layer of catalyst is severely eroded and worn, and the catalyst is prone to dust accumulation and clogging, which increases system resistance and affects the denitration efficiency and service life of the catalyst. The second layer and below catalysts are less affected. In order to reduce system resistance and improve denitration efficiency, a soot blowing device is usually set in the reactor, which not only increases the investment cost, but also has unsatisfactory results.

[0004] In addition, in industrial production operations, there are changes in production load, and the flue gas temperature and flue gas volume before the denitrification reaction fluctuate greatly. According to the fixed arrangement of the catalyst in the existing SCR reactor, the amount of catalyst used cannot be effectively changed in real time according to the production conditions, resulting in low denitrification efficiency, increased system resistance, and increased operating costs. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes an anti-blocking and resistance-reducing SCR denitrification device, which can adjust the number of reaction layers of the catalyst layer online according to the amount of flue gas, effectively prolong the service life of the catalyst, effectively improve the denitrification efficiency, and reduce system resistance.

[0006] The present invention proposes an anti-blocking and drag-reducing SCR denitrification device, comprising a shell, multiple catalyst layers and multiple groups of driving components;

[0007] An air inlet is provided at the top of the shell, an air outlet is provided at the bottom of the shell, and multiple catalyst layers are arranged in the shell in sequence and at intervals along the vertical direction, and each catalyst layer is rotatably connected to the inner wall of the shell;

[0008] The multiple groups of driving components and the multiple layers of catalyst layers are driven and connected in a one-to-one correspondence, and each catalyst layer can rotate in a vertical direction under the drive of the corresponding driving component.

[0009] Preferably, the catalyst layer comprises a rotating shaft, a sleeve, a first half catalyst layer and a second half catalyst layer;

[0010] The rotating shaft is arranged in the horizontal direction, and both ends of the rotating shaft are rotatably connected to the inner wall of the shell respectively, and the driving assembly drives the rotating shaft to drive the rotating shaft to rotate in the vertical direction;

[0011] The sleeve is keyed to the rotating shaft, and has a first side and a second side opposite to each other. The second end of the first half catalyst layer is fixedly connected to the first side of the sleeve, and the first end of the second half catalyst layer is fixedly connected to the second side of the sleeve. The first half catalyst layer and the second half catalyst layer are in the same plane.

[0012] Preferably, the first half catalyst layer comprises a plurality of first catalyst modules, the second end portion of each first catalyst module is provided with a first plug-in block, a first slot for plugging in the plurality of first plug-in blocks is axially provided on the first side of the sleeve, and the plurality of first plug-in blocks are sequentially plugged into the first slot so that the plurality of first catalyst modules are assembled into the first half catalyst layer;

[0013] The second half catalyst layer includes a plurality of second catalyst modules, each of the second catalyst modules having a second plug-in block at the first end portion, and a second slot for plugging in the plurality of plug-ins is axially opened on the second side of the sleeve, and the plurality of second plug-ins are sequentially plugged into the second slot so that the plurality of second catalyst modules can be assembled into the second half catalyst layer.

[0014] Preferably, the driving assembly includes a motor, one end of the rotating shaft passes through the inner wall of the shell and extends outside the shell to be fixedly connected to the output shaft of the motor, and a dynamic seal is provided at the connection between the rotating shaft and the shell.

[0015] Preferably, in the initial state, the multiple catalyst layers are all in a horizontal state or a vertical state;

[0016] In the operating state, the catalyst layer rotates 90 degrees each time driven by the corresponding driving assembly.

[0017] Preferably, the catalyst layer has two opposite working surfaces, both of which are provided with hardened ends, and the other side surfaces of the catalyst layer are non-working surfaces, and the outer sides of the non-working surfaces are provided with a metal layer protective layer and a high-temperature resistant elastic sealing layer.

[0018] Preferably, it also includes a flue spoiler, which is arranged at the air inlet.

[0019] Preferably, it also includes a rectifying grid, the uppermost catalyst layer in the shell is the first catalyst layer, the rectifying grid is arranged between the flue spoiler and the first catalyst layer, and the rectifying grid is an airtight structure at a position perpendicular to the rotating axis.

[0020] Preferably, it also includes an air inlet flue and an air outlet flue, wherein one end of the air inlet flue is used to be connected to a smoke generating source, and the other end is connected to the air inlet, and the air outlet flue is connected to the air outlet.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) By changing the catalyst layer from a fixed arrangement to one that rotates in a vertical direction, the driving assembly drives the catalyst layer to rotate in a vertical direction so that the catalyst layer is in a horizontal or vertical state. Both sides of the catalyst layer can be used as working surfaces. When the other side rotates over, the pores of the original catalyst layer will be backblown, which can effectively reduce dust accumulation and blockage of the catalyst, thereby eliminating the soot blowing device.

[0023] (2) The corresponding catalyst layer is rotated to a vertical state by driving the component so that the two working surfaces of the catalyst layer are parallel to the flue gas flow direction, which can effectively protect the working surface of the catalyst layer. The flue gas does not pass through this catalyst layer and directly enters the next catalyst layer, thereby protecting this catalyst layer and effectively reducing the system resistance.

[0024] (3) Through the one-to-one driving connection of multiple groups of driving components and multiple layers of catalyst layers, each layer of catalyst layer can be driven by the corresponding driving component to rotate and change its state in real time online. According to the amount of flue gas, the catalyst layer can be driven to rotate by the driving component, and the number of reaction layers of the catalyst layer can be adjusted online, so that only one or two layers of catalyst are in a horizontal state, and the other layers of catalyst are in a vertical state, so that each layer of catalyst can serve as a backup for each other, effectively prolonging the service life of the catalyst, effectively improving the denitrification efficiency, and reducing system resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an anti-blocking and resistance-reducing SCR denitrification device proposed in the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the catalyst layer in the present invention.

[0027] Figure 3 The working state of the present invention is shown in FIG. Figure 1 .

[0028] Figure 4 The working state of the present invention is shown in FIG. Figure 2 .

[0029] Figure 5The working state of the present invention is shown in FIG. Figure 3 . DETAILED DESCRIPTION

[0030] Reference Figure 1 The present invention proposes an anti-blocking and drag-reducing SCR denitrification device, comprising a housing 9, multiple catalyst layers and multiple groups of drive components;

[0031] An air inlet is provided at the top of the shell 9, and an air outlet is provided at the bottom of the shell 9. Multiple catalyst layers are arranged in the shell 9 in sequence and at intervals along the vertical direction, and each catalyst layer is rotatably connected to the inner wall of the shell 9;

[0032] The multiple groups of driving components and the multiple layers of catalyst layers are driven and connected in a one-to-one correspondence, and each catalyst layer can rotate in a vertical direction under the drive of the corresponding driving component.

[0033] The present invention changes the catalyst layer from a fixed arrangement to one that rotates in a vertical direction. The driving component drives the catalyst layer to rotate in the vertical direction so that the catalyst layer is in a horizontal state or a vertical state. Both sides of the catalyst layer can be used as working surfaces. When the other side is rotated over, the pores of the catalyst in the original catalyst layer will be backblown, which can effectively reduce catalyst dust accumulation and blockage, thereby eliminating the soot blowing device. Each layer of the catalyst layer can rotate and change its state online in real time. According to the amount of flue gas, the catalyst layer can be driven to rotate by the driving component, and the number of reaction layers of the catalyst layer can be adjusted online, so that only one or two layers of catalyst are in a horizontal state, and the other layers of catalyst are in a vertical state, so that each layer of catalyst can be used as a backup for each other, effectively prolonging the service life of the catalyst, effectively improving the denitrification efficiency, and reducing system resistance.

[0034] Reference Figure 2 In this embodiment, the catalyst layer includes a rotating shaft 7, a sleeve 8, a first half catalyst layer 6 and a second half catalyst layer 5;

[0035] The rotating shaft 7 is arranged in the horizontal direction, and both ends of the rotating shaft 7 are rotatably connected to the inner wall of the housing 9 respectively, and the driving assembly drives the rotating shaft 7 to drive the rotating shaft 7 to rotate in the vertical direction;

[0036] The sleeve 8 is key-connected to the rotating shaft 7. The sleeve 8 has a first side and a second side opposite to each other. The second end of the first half catalyst layer 6 is fixedly connected to the first side of the sleeve 8. The first end of the second half catalyst layer 5 is fixedly connected to the second side of the sleeve 8. The first half catalyst layer 6 and the second half catalyst layer 5 are in the same plane. The second end of the first half catalyst layer 6 is fixedly connected to the rotating shaft 7.

[0037] In this embodiment, the first half catalyst layer 6 and the second half catalyst layer 5 are fixed to the rotating shaft 7 by the bushing 8, which is convenient for disassembly; the rotating shaft 7 is driven by the driving assembly to rotate in the vertical direction to rotate the first half catalyst layer 6 and the second half catalyst layer 5 in the vertical direction, so that the first half catalyst layer 6 and the second half catalyst layer 5 can be in a horizontal state or a vertical state.

[0038] In this embodiment, the first half catalyst layer 6 includes a plurality of first catalyst modules, and a first plug-in block is provided at the second end of each first catalyst module. A first slot for inserting the plurality of first plug-ins is axially provided on the first side of the sleeve 8, and the plurality of first plug-ins are sequentially inserted into the first slot so that the plurality of first catalyst modules are assembled into the first half catalyst layer 6, which facilitates the disassembly, assembly and replacement of the first half catalyst layer 6;

[0039] The second half catalyst layer 5 includes multiple second catalyst modules, and the first end portion of each second catalyst module is provided with a second plug-in block. The second side of the sleeve 8 is axially provided with a second slot for plugging in multiple plug-ins. The multiple second plug-ins are sequentially plugged into the second slot so that the multiple second catalyst modules are assembled into the second half catalyst layer 5, which facilitates the disassembly, assembly and replacement of the second half catalyst layer 5.

[0040] In this embodiment, the driving assembly includes a motor, one end of the rotating shaft 7 penetrates the inner wall of the housing 9 and extends outside the housing 9 to be fixedly connected to the output shaft of the motor, and a dynamic seal is provided at the connection between the rotating shaft 7 and the housing 9. When the motor is working, the output shaft of the motor rotates to drive the rotating shaft 7 to rotate, thereby driving the catalyst layer to rotate, and the dynamic seal can prevent smoke from overflowing.

[0041] In this embodiment, in the initial state, the multiple catalyst layers are in a horizontal state or a vertical state. In the operating state, the catalyst layers rotate 90 degrees each time driven by the corresponding driving components. Therefore, it can be ensured that the corresponding catalyst layers are driven by the driving components to be in a horizontal state to fully contact and react with the flue gas or in a vertical state to avoid flue gas scouring, so as to simplify procedures and operations.

[0042] In this embodiment, the catalyst layer has two opposite working surfaces, and both working surfaces are provided with hardened ends to ensure that the catalyst can withstand flue gas erosion. The other side surfaces of the catalyst layer are non-working surfaces, and a metal layer protective layer and a high-temperature resistant elastic sealing layer are provided on the outer side of the non-working surface to ensure the integrity and stability of the catalyst layer structure and to enable full contact with the flue gas, thereby effectively improving the denitrification effect.

[0043] In this embodiment, a flue spoiler 2 is also included. The flue spoiler 2 is arranged at the air inlet, which is beneficial to reducing the possibility of ash blockage, thereby improving the safety of the operation of the SCR reaction device.

[0044] In this embodiment, a rectifying grid 3 is also included. The catalyst layer at the top layer in the housing 9 is the first catalyst layer. The rectifying grid 3 is arranged between the flue spoiler 2 and the first catalyst layer. The rectifying grid 3 is an airtight structure at a position perpendicular to the rotating shaft 7. The rectifying grid 3 is used for rectifying, so that the flue gas is fully in contact with the catalyst layer, effectively improving the denitration effect, and protecting the exposed rotating shaft 7 through the airtight structure, reducing the scouring and wear of the rotating shaft 7 by the flue gas.

[0045] In this embodiment, an air inlet flue 1 and an air outlet flue 4 are also included. One end of the air inlet flue 1 is used to be connected to a smoke generating source, and the other end is connected to the air inlet. The air outlet flue 4 is connected to the air outlet to facilitate the entry and discharge of smoke.

[0046] When implementing it, Figure 3-5 As shown, three catalyst layers are arranged in the shell 9, which are the first catalyst layer, the second catalyst layer and the third catalyst layer. In the initial state, the first catalyst layer, the second catalyst layer and the third catalyst layer are all in a horizontal state. Taking the first catalyst layer as an example, its two working surfaces are surface A and surface B. During operation, the flue gas and ammonia are fully mixed and pass through the air intake flue 1, the flue guide plate 2 and the rectifying grid 3 to enter the catalyst layer for catalytic reduction reaction. When the amount of flue gas is large, all catalyst layers are in a horizontal state, and surface A of the first catalyst layer receives the flushing of flue gas; when the amount of flue gas is not large, the corresponding catalyst layer can be driven to rotate in a vertical state by any of the driving components, such as Figure 3 As shown, the second catalyst layer rotates in a vertical state under the drive of its corresponding driving assembly. After passing through the first catalyst layer, the flue gas directly flows to the third catalyst layer. Under the action of the third catalyst layer, the flue gas continues to undergo catalytic reduction reaction, effectively reducing the resistance of the system and saving energy consumption. Figure 4 As shown, the first catalyst layer can also be driven to rotate by the driving assembly so that the first catalyst layer is in a vertical state, and the flue gas flows directly to the second catalyst layer, and the A surface of the first catalyst layer will not be washed by the dust-containing flue gas. Figure 5 As shown, the first catalyst layer is driven to rotate by the driving assembly, and the third catalyst layer is driven to rotate at the same time, ensuring the operation of the two layers of catalysts. However, the B surface of the first catalyst layer is used as the flushing surface of the dusty flue gas, and the flue gas will back-blow the pores of the catalyst of the first catalyst layer, which can effectively reduce the dust accumulation and blockage of the catalyst, reduce the system resistance, and then cancel the soot blowing device to simplify the structure. Finally, the flue gas is discharged from the denitrification system through the exhaust flue 4.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An SCR denitrification device that prevents blockage and reduces resistance, It is characterized in that It comprises a housing (9), multiple catalyst layers and multiple groups of drive components; An air inlet is provided at the top of the shell (9), an air outlet is provided at the bottom of the shell (9), multiple catalyst layers are arranged in the shell (9) in sequence and at intervals along the vertical direction, and each catalyst layer is rotatably connected to the inner wall of the shell (9); Multiple groups of driving components and multiple layers of catalyst layers are connected in a one-to-one driving manner, and each catalyst layer can rotate in a vertical direction under the drive of the corresponding driving component; The catalyst layer comprises a rotating shaft (7), a shaft sleeve (8), a first half catalyst layer (6) and a second half catalyst layer (5); The rotating shaft (7) is arranged in the horizontal direction, and both ends of the rotating shaft (7) are respectively rotatably connected to the inner wall of the housing (9), and the driving component drives the rotating shaft (7) to drive the rotating shaft (7) to rotate in the vertical direction; The shaft sleeve (8) is key-connected to the rotating shaft (7), the shaft sleeve (8) has a first side and a second side opposite to each other, the second end of the first half catalyst layer (6) is fixedly connected to the first side of the shaft sleeve (8), the first end of the second half catalyst is fixedly connected to the second side of the shaft sleeve (8), and the first half catalyst layer (6) and the second half catalyst layer (5) are in the same plane; Through the one-to-one driving connection of multiple groups of driving components and multiple layers of catalyst layers, each layer of catalyst layer can be driven by the corresponding driving component to change its state in real time online. According to the amount of flue gas, the catalyst layer can be driven to rotate by the driving component, and the number of reaction layers of the catalyst layer can be adjusted online, so that only one or two layers of catalyst are in a horizontal state, and the other layers of catalyst are in a vertical state, so that each layer of catalyst can serve as backup for each other.

2. The anti-blocking and resistance-reducing SCR denitrification device according to claim 1, It is characterized in that The first half catalyst layer (6) comprises a plurality of first catalyst modules, a first plug-in block is provided at the second end of each first catalyst module, a first slot for plugging the plurality of first plug-ins is axially provided on the first side of the shaft sleeve (8), and the plurality of first plug-ins are sequentially plugged into the first slot so that the plurality of first catalyst modules are assembled into the first half catalyst layer (6); The second half catalyst layer (5) comprises a plurality of second catalyst modules, each second catalyst module is provided with a second plug-in block at the first end portion, a second slot for plugging in the plurality of plug-ins is axially opened on the second side of the sleeve (8), and the plurality of second plug-ins are plugged into the second slot in sequence so that the plurality of second catalyst modules are assembled into the second half catalyst layer (5).

3. The anti-blocking and resistance-reducing SCR denitrification device according to claim 2, It is characterized in that The driving assembly comprises a motor, one end of a rotating shaft (7) passes through the inner wall of a housing (9) and extends outside the housing (9) to be fixedly connected to an output shaft of the motor, and a dynamic seal is provided at the connection between the rotating shaft (7) and the housing (9).

4. The anti-blocking and resistance-reducing SCR denitrification device according to claim 1, It is characterized in that In the initial state, the multiple catalyst layers are in a horizontal or vertical state; In the operating state, the catalyst layer rotates 90 degrees each time driven by the corresponding driving assembly.

5. The anti-blocking and resistance-reducing SCR denitrification device according to claim 1, It is characterized in that The catalyst layer has two opposite working surfaces, both of which are provided with hardened ends. The other side surfaces of the catalyst layer are non-working surfaces, and the outer sides of the non-working surfaces are provided with a metal layer protection layer and a high-temperature resistant elastic sealing layer.

6. The anti-blocking and resistance-reducing SCR denitrification device according to any one of claims 1 to 5, It is characterized in that It also includes a flue spoiler (2), which is arranged at the air inlet.

7. The anti-blocking and resistance-reducing SCR denitrification device according to claim 6, It is characterized in that It also includes a rectifying grid (3), the catalyst layer located at the topmost layer in the shell (9) is a first catalyst layer, the rectifying grid (3) is arranged between the flue spoiler (2) and the first catalyst layer, and the rectifying grid (3) and the rotating shaft (7) are vertically corresponding to the airtight structure.

8. The anti-blocking and resistance-reducing SCR denitrification device according to claim 7, It is characterized in that It also comprises an air inlet flue (1) and an air outlet flue (4), wherein one end of the air inlet flue (1) is used to be connected to a flue gas generating source, and the other end is connected to an air inlet, and the air outlet flue (4) is connected to the air outlet.

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