A method for removing CO from sintering flue gas after desulfurization and dust removal

Abstract

The present invention relates to the technical field of flue gas treatment, and specifically to a method for removing CO after desulfurization and dust removal based on sintering flue gas. The sintering flue gas is subjected to dust removal after desulfurization treatment, and then the flue gas enters the GGH heat exchanger for heating, and enters the SCR denitrification reactor and the CO catalytic reactor for denitrification and CO removal after supplementary combustion in the hot blast furnace for heating. Finally, the high-temperature flue gas is discharged outward after heat exchange in the GGH heat exchanger. When removing CO, the catalyst module is regularly moved out for cleaning treatment. The present invention improves the removal rate of CO and dust particles in the flue gas by arranging multi-stage catalysis, and catalyst modules of different stages will not be moved out for cleaning treatment at the same time, ensuring that at least three stages of catalytic filtration are retained in the reaction chamber to ensure catalytic efficiency. By moving the catalyst module, each knocking member performs alternating and multi-point knocking on different positions of the upper and lower surfaces of the catalyst module, thereby realizing mechanical cleaning treatment of the catalyst module and extending the service life of the catalyst module.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a method for removing CO from sintering flue gas after desulfurization and dust removal. Background Art

[0002] The steel industry is a pillar industry for the development of the national economy. The sintering flue gas generated during the steel production process includes CO, SO2, NO x Before discharge, only ultra-low emission treatment is carried out for SO2, NOx, dust, dioxins, etc. in the sintering flue gas, and no ultra-low emission treatment is carried out for CO. On the one hand, it causes waste of resources and increases carbon emissions. On the other hand, CO can cause varying degrees of poisoning in people at higher concentrations.

[0003] In view of the above situation, when treating sintering flue gas, the flue gas needs to be treated in sequence through a semi-dry desulfurization reactor, a GGH heat exchanger, a precious metal catalytic oxidation reactor, a hot air furnace, and an SCR reactor before being discharged. Although the emission of CO has been reduced to a certain extent, the following problems still exist: First, the existing solution uses precious metal catalysts to remove CO, which is costly, and precious metals are particularly sensitive to sulfur and alkali metal dust, and the catalysts are easily poisoned, resulting in a short catalyst service life, a short replacement cycle, and increased operating costs.

[0004] Second, the active sites on the catalyst will be covered when filtering dust. Usually, high-pressure gas is blown onto the catalyst at regular intervals to blow off the dust and expose the active sites, so as to extend the replacement cycle and service life of the catalyst. However, due to the thickness of the catalyst and the small pores, it is often difficult for high-pressure gas to fully penetrate the catalyst, resulting in the cleaning effect needs to be improved. Summary of the Invention

[0005] Based on this, it is necessary to provide a method for removing CO after desulfurization and dust removal of sintering flue gas, aiming to solve the problems of the above-mentioned prior art.

[0006] The present application provides a method for removing CO from sintering flue gas after desulfurization and dust removal, comprising the following steps: first, the sintering flue gas is desulfurized and then dusted; the flue gas after desulfurization and dust removal enters a GGH heat exchanger for heating; after being heated by supplementary combustion in a hot blast furnace, it enters an SCR denitrification reactor and a CO catalytic reactor for denitrification and CO removal; finally, the high-temperature flue gas is discharged after heat exchange in the GGH heat exchanger; the CO catalytic reactor comprises a reaction chamber, a smoke inlet arranged at the top of the reaction chamber, and a smoke exhaust port at the bottom of the reaction chamber; a plurality of vertically distributed mobile catalytic sections are arranged in the reaction chamber, and each mobile catalytic section comprises two catalyst modules distributed up and down and capable of moving alternately left and right.

[0007] The left and right outer walls of the reaction chamber are provided with a cleaning part corresponding to each catalyst module. The cleaning part includes a cleaning bin connected to the reaction chamber, a plurality of knocking members installed inside the cleaning bin and rotating from left to right, and a toggle member for driving the knocking members to operate.

[0008] The multi-stage movable catalytic section is not cleaned at the same time. When the catalyst module moves alternately left and right, the corresponding toggle piece is pushed to drive the knocking piece to knock the catalyst module up and down for cleaning. Every two knocks constitute a round. The number of knocking points in the same round is the same. The knocking points in the next round are multiples of the previous round. The dust particles dropped by the knocking are discharged from the cleaning bin.

[0009] According to a favorable embodiment, through grooves are provided on the left and right side walls of the reaction chamber corresponding to the position of the catalyst module, and supporting members are provided on the left and right inner walls of the reaction chamber and below the catalyst module. There are multiple supporting members on each side for supporting the catalyst module.

[0010] According to a favorable embodiment, the bottom wall of the ash cleaning bin is sloping downward, and an ash discharge slot is provided at the lowest point of the bottom wall of the ash cleaning bin. An ash discharge channel is provided at the bottom end of the ash discharge slot of each ash cleaning bin, and the ash discharge channel is connected to the ash cleaning bin located below it.

[0011] According to a favorable embodiment, each knocking member includes two V-shaped plates respectively arranged on the front and rear side walls of the dust cleaning bin by rotating shafts, and multiple rotating shafts are connected by sprocket chains. Two connecting rods are fixedly connected between the two front and rear opposite V-shaped plates. The two connecting rods are respectively located at the upper and lower ends of the V-shaped plates, and multiple knocking rods are installed on the opposite sides of the two connecting rods.

[0012] According to an advantageous embodiment, initially, the bottom end of the knocking rod on the upper connecting rod is lower than the upper surface of the catalyst module, and the top end of the knocking rod on the lower connecting rod is lower than the lower surface of the catalyst module.

[0013] According to an advantageous embodiment, the toggle member includes a moving portion and a pushing portion provided on the moving portion, wherein the moving portion includes a moving cavity for mounting the pushing portion and driving the pushing portion to move back and forth left and right.

[0014] A plurality of supporting rods slide through the dust cleaning bin and are fixed to the movable cavity.

[0015] The connecting plate is fixed to one end of the plurality of supporting rods located outside the dust cleaning bin.

[0016] Spring No. 1 is connected between the connecting plate and the ash cleaning bin to drive the connecting plate to reset. The reset time of the connecting plate is later than the reset time of the catalyst module.

[0017] According to an advantageous embodiment, the pushing portion includes a tilting plate, which is slidably installed in the moving cavity and is used to push the knocking rod. The top of the tilting plate is consistent with the tilt state of the top of the moving cavity.

[0018] The jacking block is installed on the moving cavity for left and right sliding. The jacking block consists of a right-angled trapezoidal block and a horizontal plate integrally fixed to the bottom end of the hypotenuse of the right-angled trapezoidal block. A vertical plate is fixed on one side of the horizontal plate located outside the moving cavity.

[0019] The lifting plate is fixedly installed on the bottom end of the toggle inclined plate and is in contact with the upper surface of the lifting block to push the toggle inclined plate upward.

[0020] The second spring is fixedly connected between the vertical plate and the outer wall of the movable cavity and is used to move the inclined plate downward and reset.

[0021] According to a favorable embodiment, the side of the top of the movable cavity close to the catalyst module is higher than the side away from the catalyst module, the highest point of the top of the movable cavity does not exceed the upper surface of the catalyst module, and the bottom of the movable cavity is not lower than the lower surface of the catalyst module.

[0022] Initially, the right-angled trapezoidal block is located on the side of the moving cavity away from the supporting rod, the horizontal plate passes through the side of the moving cavity close to the supporting rod, the bottom end of the lifting plate abuts against the horizontal plate, and the tilting plate is completely in the moving cavity.

[0023] According to an advantageous embodiment, the flue gas desulfurization treatment adopts a dry desulfurization process or a semi-dry CFB desulfurization process. When the semi-dry CFB desulfurization process is adopted, a slaked lime injection system is added in front of the CFB desulfurization tower.

[0024] In summary, the present invention includes at least one of the following beneficial effects: 1. The present invention improves the removal rate of CO and dust particles in the flue gas by setting up multi-stage catalysis, and the catalyst modules of different stages will not be moved out for cleaning at the same time, ensuring that at least three levels of catalytic filtration are retained inside the reaction chamber to ensure catalytic efficiency.

[0025] 2. By moving the catalyst module, the toggle member is pushed so that the toggle member sequentially toggle the knocking members to knock on the upper and lower surfaces of the catalyst module alternately. As the toggle member sequentially toggles the knocking members, the number of knocking points increases and the positions change, thereby realizing mechanical cleaning of the catalyst module, exposing the active points of the catalyst module, and extending the service life of the catalyst module.

[0026] 3. The present invention adopts transition metal catalytic oxidants, which are lower in cost than traditional precious metal catalysts and are not easily affected by sulfur elements, which may cause catalyst poisoning and deactivation. After the flue gas has been treated in the early stage, most of the alkali metal ions have been removed, which greatly extends the life of the catalyst, lengthens the catalyst replacement cycle, reduces operation and maintenance costs, and achieves economic benefits.

[0027] Fourth, the present invention can introduce high-pressure gas into the dust cleaning bin to assist the mechanical dust cleaning method. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] Figure 1 A flow chart of the present invention is shown.

[0030] Figure 2 A schematic plan view of the structure of a CO catalytic reactor according to an embodiment of the present invention is shown.

[0031] Figure 3 A schematic diagram of the three-dimensional structure of a CO catalytic reactor provided according to an embodiment of the present invention is shown.

[0032] Figure 4 A schematic diagram of the internal structure of a CO catalytic reactor provided according to an embodiment of the present invention is shown.

[0033] Figure 5 A partial structural schematic diagram of a CO catalytic reactor provided according to an embodiment of the present invention is shown.

[0034] Figure 6 A schematic structural diagram of a reciprocating drive member according to an embodiment of the present invention is shown.

[0035] Figure 7 Shown Figure 5 Schematic diagram of the enlarged structure of area A in the middle.

[0036] Figure 8 A schematic structural diagram of a striking member provided according to an embodiment of the present invention is shown.

[0037] Figure 9 A structural schematic diagram of a toggle member provided according to an embodiment of the present invention is shown.

[0038] Figure 10 A partial cross-sectional view of a toggle member according to an embodiment of the present invention is shown.

[0039] The above drawings include the following reference numerals:

[0040] 1. CO catalytic reactor; 10. Reaction chamber; 11. Through groove; 12. Supporting member; 13. Sealing plate; 14. Smoke inlet; 15. Smoke exhaust port; 2. Mobile catalytic unit; 20. Catalyst module; 21. Circular shaft; 22. Rotating bar; 23. Avoidance groove; 24. Rotating shaft; 3. Ash cleaning unit; 30. Ash cleaning bin; 31. Ash discharge channel; 32. Knocking member; 321. V-shaped plate; 322. Connecting rod; 323. Knocking rod; 33. Toggle member; 331. Mobile chamber; 332. Supporting rod; 333. Connecting plate; 334. Spring No. 1; 335. Toggle inclined plate; 336. Lifting block; 337. Spring No. 2; 338. Lifting plate. DETAILED DESCRIPTION

[0041] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] like Figure 1 and Figure 2 The method for removing CO from sintering flue gas after desulfurization and dust removal includes the following steps: First, the sintering flue gas undergoes desulfurization treatment and then enters a bag filter for dust removal, filtering out dust particles and alkali metal ions. After desulfurization and dust removal, the flue gas enters a GGH heat exchanger to be heated to 220°C-250°C. After being heated by a hot blast furnace, it enters an SCR denitrification reactor and a CO catalytic reactor 1 for denitrification and CO removal. Finally, the high-temperature flue gas is heat exchanged in the GGH heat exchanger and discharged. The bag filter uses glass fiber composite filter bags.

[0043] It should be noted that flue gas desulfurization treatment can adopt dry desulfurization or semi-dry CFB / SDA desulfurization process. When using CFB desulfurization tower for desulfurization, a slaked lime system is added in front of the CFB desulfurization tower to spray slaked lime to prevent SO2 from exceeding the standard during the bed construction of the CFB desulfurization scheme, which affects the activity of the downstream CO catalyst.

[0044] like Figure 3 、 Figure 4 、 Figure 5 and Figure 7As shown, the CO catalytic reactor 1 comprises a reaction chamber 10, a smoke inlet 14 provided at the top of the reaction chamber 10, and a smoke exhaust port 15 at the bottom of the reaction chamber 10. Several mobile catalytic units 2 are provided inside the CO catalytic reactor 1 from top to bottom. Each mobile catalytic unit 2 includes two catalyst modules 20 distributed vertically and capable of alternating left and right movement. Through slots 11 are provided on the left and right side walls of the reaction chamber 10 corresponding to the positions of the catalyst modules 20, facilitating the catalyst modules 20 to pass through the through slots 11 and out of the reaction chamber 10 when moving left and right. Support members 12 are provided on the left and right inner walls of the reaction chamber 10 below the catalyst modules 20. Multiple support members 12 are provided on each side for supporting the catalyst modules 20. The spacing of the multiple support members 12 ensures the stability of the support for the catalyst modules 20 and avoids the problem of smoke being blocked after passing through the catalyst modules 20.

[0045] The flue gas after denitrification enters the reaction chamber 10 from the smoke inlet 14, removes CO and dust particles after catalysis by the catalyst module 20, and then flows out from the smoke exhaust port 15, and is discharged to the outside after heat exchange in the GGH heat exchanger. When the flue gas is removing CO, the catalyst module 20 is regularly removed from the outside for cleaning to expose the active points.

[0046] like Figure 4 、 Figure 5 and Figure 6 As shown, the catalyst module 20 that moves alternately left and right is driven by a reciprocating drive member, which includes a circular shaft 21 fixed to the middle of the front side of the catalyst module 20 and a rotating shaft 24 rotatably installed on the front side wall of the reaction chamber 10. One end of the rotating shaft 24 extending into the interior of the reaction chamber 10 is fixedly connected to a rotating bar 22, and a bar-shaped avoidance groove 23 is provided on the rotating bar 22 at positions corresponding to the upper and lower circular shafts 21, and the circular shaft 21 slides in conjunction with the avoidance groove 23.

[0047] By rotating the rotating shaft 24, the rotating bar 22 rotates accordingly, and the avoidance groove 23 on the rotating bar 22 and the circular shaft 21 slide together to move the two adjacent catalyst modules 20 in opposite directions. The projected overlapping area of ​​the catalyst modules 20 remaining inside the reaction chamber 10 gradually decreases, and the original two-stage catalytic filtration gradually changes to a single-stage catalytic filtration.

[0048] It should be noted that the catalyst module 20 is a transition metal catalytic oxidant. The maximum distance that the catalyst module 20 in each mobile catalyst unit 2 can move is half the length of the catalyst module 20. Several mobile catalyst units 2 do not need to move at the same time. When the catalyst module 20 in any mobile catalyst unit 2 is moved for cleaning, at least three levels of catalytic filtration will be retained inside the reaction chamber 10 to ensure the efficiency of removing CO from the flue gas.

[0049] Of course, the catalyst module 20 can be moved in more than one way. It can also be moved back and forth alternately by two independent high-temperature resistant electric push rods, or by a single gear driving two racks to move in opposite directions.

[0050] like Figure 5 and Figure 7 As shown, a sealing plate 13 is rotatably installed on the top of the through slot 11. The sealing plate 13 is in a vertical state under the action of its own weight and is used to close the through slot 11. When the catalyst module 20 moves in the left and right directions, it pushes the sealing plate 13 at the corresponding position to flip upward, opening the through slot 11 so that the catalyst module 20 can pass to the outside.

[0051] like Figure 5 and Figure 8 As shown, a cleaning portion 3 is further provided on the outside of the reaction chamber 10, and the cleaning portion 3 includes a cleaning bin 30 provided at the positions of the left and right outer walls of the reaction chamber 10 corresponding to the through grooves 11 and a knocking piece 32 provided inside the cleaning bin 30 for cleaning the catalyst module 20; the bottom wall of the cleaning bin 30 is in a downwardly sloping shape, specifically, the side of the bottom wall of the cleaning bin 30 close to the reaction chamber 10 is higher than the side away from the reaction chamber 10, and an ash discharge slot is provided at the lowest point of the bottom wall of the cleaning bin 30. After the catalyst module 20 moves to the outside of the reaction chamber 10, it enters the cleaning bin 30 and is knocked multiple times by the knocking piece 32 during the movement, knocking off the attached dust particles and exposing the active points. The fallen dust particles slide along the bottom wall of the cleaning bin 30 and are discharged from the ash discharge slot.

[0052] Continue reading Figure 5 and Figure 8 There are multiple knocking members 32 evenly distributed from left to right, and each knocking member 32 includes two V-shaped plates 321 respectively arranged on the front and rear side walls of the dust cleaning bin 30. The corners of the V-shaped plates 321 are rotatably connected to the dust cleaning bin 30 through a rotating shaft. Two connecting rods 322 are fixedly connected between the two front and rear opposite V-shaped plates 321. The two connecting rods 322 are respectively located at the upper and lower ends of the V-shaped plates 321. Multiple knocking rods 323 are installed on the opposite sides of the upper and lower connecting rods 322. The knocking rods 323 on the upper and lower connecting rods 322 can be directly opposite to each other or staggered. Either way, the knocking effect can be enhanced, and the staggered distribution method can also increase the dispersion of the knocking points.

[0053] It should be noted that multiple rotating shafts extend out of the cleaning bin 30 and are connected by a sprocket chain, and a torsion spring is installed between at least one rotating shaft and the cleaning bin 30. The elastic force of the torsion spring enables all V-shaped plates 321 to initially maintain the same tilted state. Specifically, the bottom end of the knocking rod 323 on the upper connecting rod 322 is lower than the upper surface of the catalyst module 20, and the top end of the knocking rod 323 on the lower connecting rod 322 is lower than the lower surface of the catalyst module 20.

[0054] like Figure 5 、 Figure 8 、 Figure 9 and Figure 10 As shown, the cleaning part 3 also includes a toggle member 33 for driving the V-shaped plate 321 to rotate, and the toggle member 33 includes a moving part and a push part arranged on the moving part, wherein the moving part includes a moving cavity 331, a supporting rod 332, a connecting plate 333 and a spring 334, and a plurality of supporting rods 332 are evenly distributed from front to back, and the plurality of supporting rods 332 slide through the cleaning bin 30, and one end of the plurality of supporting rods 332 located inside the cleaning bin 30 is fixedly connected to the moving cavity 331. 31. One end of the multiple supporting rods 332 located outside the ash cleaning bin 30 is fixedly connected to a connecting plate 333, and the connecting plate 333 and the ash cleaning bin 30 are connected by a No. 1 spring 334. When the movable cavity 331 moves, the length of the supporting rod 332 extending out of the ash cleaning bin 30 gradually increases, the No. 1 spring 334 is gradually stretched, and the connecting plate 333 moves further away from the ash cleaning bin 30. When the No. 1 spring 334 resets, it drives the movable cavity 331 to move in the opposite direction, thereby realizing the reciprocating movement of the movable part.

[0055] Continue reading Figure 9 and Figure 10 The jacking part includes a toggle inclined plate 335, a lifting block 336, a second spring 337 and a lifting plate 338. The moving cavity 331 is a cavity structure with an open top, and the top of the moving cavity 331 is inclined. The toggle inclined plate 335 is slidably installed in the moving cavity 331, and the top of the toggle inclined plate 335 is consistent with the tilt state of the top of the moving cavity 331. The bottom end of the toggle inclined plate 335 is fixedly installed with a lifting plate 338. The bottom end of the lifting plate 338 is arc-shaped, and the lifting block 336 is on the left. The right slide is installed on the movable cavity 331, wherein the lifting block 336 is composed of a right-angled trapezoidal block and a horizontal plate integrally fixed at the bottom end of the hypotenuse of the right-angled trapezoidal block. Initially, the right-angled trapezoidal block is located on the side of the movable cavity 331 away from the supporting rod 332, the horizontal plate passes through the side of the movable cavity 331 close to the supporting rod 332, the bottom end of the lifting plate 338 is in contact with the horizontal plate, and the horizontal plate is located on the side outside the movable cavity 331 and is fixedly installed with a vertical plate, and a No. 2 spring 337 is fixed between the vertical plate and the outer wall of the movable cavity 331.

[0056] It should be noted that the highest point of the top of the movable cavity 331 does not exceed the upper surface of the catalyst module 20, the bottom end of the movable cavity 331 is not lower than the lower surface of the catalyst module 20, the side of the top of the movable cavity 331 close to the catalyst module 20 is higher than the side away from the catalyst module 20, and the knocking parts 32 and the toggle parts 33 in the cleaning bins 30 on the left and right sides are symmetrically arranged.

[0057] During operation, when the catalyst module 20 moves, the catalyst module 20 will first push the sealing plate 13 to open, and then the catalyst module 20 will begin to enter the ash cleaning bin 30 and gradually approach the lifting block 336. The lifting block 336 moves when it is pushed by the catalyst module 20. At this time, the slope of the right-angled trapezoidal block will gradually approach the lifting plate 338 and push the lifting plate 338 and the toggle inclined plate 335 to extend upward. The height of the toggle inclined plate 335 will exceed the upper surface of the catalyst module 20. When the vertical surface of the lifting block 336 is level with the moving cavity 331, the catalyst module 20 will enter the ash cleaning bin 30 and gradually approach the lifting block 336. The lifting block 336 moves when it is pushed by the catalyst module 20. At this time, the slope of the right-angled trapezoidal block will gradually approach the lifting plate 338 and push the lifting plate 338 and the toggle inclined plate 335 to extend upward. The height of the toggle inclined plate 335 will exceed the upper surface of the catalyst module 20. When the moving part 33 is aligned, the catalyst module 20 will push the moving part and the pushing part to move together. When the toggle member 33 is pushed, the toggle inclined plate 335 will toggle the knocking rod 323 located above, so that the knocking rod 323 drives the V-shaped plate 321 to rotate, and the knocking rod 323 located below gradually approaches the bottom of the catalyst module 20 and completes a knock. When the toggle inclined plate 335 passes over the knocking rod 323 above, the knocking rod 323 drives the V-shaped plate 321 to rotate, so that the knocking rod 323 above knocks to the top of the catalyst module 20 and completes a knock.

[0058] Since multiple V-shaped plates 321 are connected by sprocket chain transmission, when the knocking rod 323 located above the first V-shaped plate 321 hits the upper surface of the catalyst module 20, the bottom ends of the knocking rods 323 located above the remaining V-shaped plates 321 will also be flush with the upper surface of the catalyst module 20. Then the catalyst module 20 continues to push the toggle member 33 to move, and the toggle inclined plate 335 toggle the knocking rod 323 on the second V-shaped plate 321 again, so that the knocking rod 323 drives the second V-shaped plate 321 to rotate, and the knocking rod 323 located below gradually approaches the bottom of the catalyst module 20 again and completes two knocks. When the toggle inclined plate 335 passes over the upper knocking rod 323, the knocking rod 323 drives the V-shaped plate 321 to rotate, so that the upper knocking rod 323 knocks to the top of the catalyst module 20 and completes two knocks, and the subsequent steps are similar.

[0059] It should be noted that the two knocks are completed by the knocking rod 323 on the first V-shaped plate 321 and the second V-shaped plate 321. Through the synchronous transmission of the sprocket chain, the number of knocks increases step by step, thereby enhancing the knocking effect, improving the efficiency of knocking off dust particles, exposing more active points, and extending the replacement cycle and service life of the catalyst module 20.

[0060] When the catalyst module 20 completes all the knocking times in the cleaning bin 30, the supporting rod 332 extends the longest distance out of the cleaning bin 30. When the catalyst module 20 needs to be reset, it is necessary to use external force to keep the connecting plate 333 fixed for a period of time. The purpose is to reset the No. 2 spring 337 first to drive the lifting block 336 to reset, and ensure that the inclined plate 335 falls back into the moving cavity 331. Then remove the external force to quickly reset the No. 1 spring 334 to drive the supporting rod 332 and the moving cavity 331 to move in the opposite direction to their original positions. In this process, since the upper surface of the catalyst module 20 is still in contact with part of the knocking rod 323, the reset process of the moving cavity 331 is not blocked by the knocking rod 323.

[0061] like Figure 2 and Figure 5 As shown, an ash discharge channel 31 is provided at the bottom of the ash discharge slot of each ash cleaning bin 30, and the ash discharge channel 31 is connected to the ash cleaning bin 30 located below it. All dust particles are discharged from the ash discharge slot and enter the corresponding ash discharge channel 31. The dust particles above converge downward step by step and are finally discharged together from the bottom ash discharge channel 31.

[0062] In addition, in order to increase the cleaning effect, those skilled in the art may conceive of introducing high-pressure gas into the interior of the cleaning bin 30 to assist the mechanical cleaning method.

[0063] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0064] Furthermore, the terms "first," "second," "number one," and "number two" 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 designated as "first," "second," "number one," or "number two" 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.

[0065] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0066] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for removing CO from sintering flue gas after desulfurization and dust removal, comprising the following steps: first, the sintering flue gas is desulfurized and then dusted. After desulfurization and dust removal, the flue gas enters a GGH heat exchanger for heating. After heating through supplementary combustion in a hot blast furnace, it enters an SCR denitrification reactor and a CO catalytic reactor for denitrification and CO removal. Finally, the high-temperature flue gas is discharged after heat exchange in the GGH heat exchanger. The CO catalytic reactor comprises a reaction chamber, a smoke inlet at the top of the reaction chamber, and a smoke exhaust at the bottom of the reaction chamber. The method is characterized by: A multi-stage vertically distributed mobile catalyst section is provided in the reaction chamber. The mobile catalyst section includes two catalyst modules that are distributed vertically and can move alternately left and right. The left and right outer walls of the reaction chamber are provided with a ash cleaning part corresponding to each catalyst module. The ash cleaning part includes an ash cleaning bin connected to the reaction chamber, a plurality of knocking members installed inside the ash cleaning bin and rotating from left to right, and a toggle member for driving the knocking members. The multi-stage movable catalytic section is not cleaned at the same time. When the catalyst module moves alternately left and right, the toggle piece is pushed to drive the knocking piece to knock the catalyst module up and down for cleaning. Two knocks constitute a round. The number of knocking points in the same round is the same. The knocking points in the next round are multiples of the previous round. The dust particles dropped by the knocking are discharged from the cleaning bin.

2. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 1, characterized in that: The left and right side walls of the reaction chamber are provided with through grooves corresponding to the positions of the catalyst modules. The left and right inner walls of the reaction chamber are provided with supporting members below the catalyst modules. There are multiple supporting members on each side for supporting the catalyst modules.

3. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 1, characterized in that: The bottom wall of the ash cleaning bin is in a downward sloping shape, and an ash discharge slot is provided at the lowest point of the bottom wall of the ash cleaning bin. An ash discharge channel is provided at the bottom end of the ash discharge slot of each ash cleaning bin, and the ash discharge channel is connected to the ash cleaning bin located below it.

4. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 1, characterized in that: Each knocking member includes two V-shaped plates respectively arranged on the front and rear side walls of the dust cleaning bin by rotating shafts. Multiple rotating shafts are connected by sprocket chains. Two connecting rods are fixedly connected between the two V-shaped plates facing each other. The two connecting rods are respectively located at the upper and lower ends of the V-shaped plates, and multiple knocking rods are installed on the opposite sides of the two connecting rods.

5. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 4, characterized in that: Initially, the bottom end of the knocking rod on the upper connecting rod is lower than the upper surface of the catalyst module, and the top end of the knocking rod on the lower connecting rod is lower than the lower surface of the catalyst module.

6. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 1, characterized in that: The toggle member includes a moving part and a push-up part arranged on the moving part, wherein the moving part includes a moving cavity for mounting the push-up part and driving the push-up part to move back and forth left and right; Multiple supporting rods slide through the dust cleaning bin and are fixed to the moving cavity; A connecting plate is fixed to one end of a plurality of supporting rods located outside the dust cleaning bin; Spring No. 1 is connected between the connecting plate and the ash cleaning bin to drive the connecting plate to reset. The reset time of the connecting plate is later than the reset time of the catalyst module.

7. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 6, characterized in that: The pushing part includes a tilting plate, which is slidably installed in the moving cavity and is used to push the knocking rod. The top of the tilting plate is in the same tilt state as the top of the moving cavity. The lifting block is installed on the moving cavity for left and right sliding. The lifting block consists of a right-angled trapezoidal block and a horizontal plate integrally fixed to the bottom end of the hypotenuse of the right-angled trapezoidal block. A vertical plate is fixedly installed on one side of the horizontal plate located outside the moving cavity. The lifting plate is fixedly installed at the bottom end of the toggle inclined plate and is in contact with the upper surface of the lifting block to push the toggle inclined plate upward; The second spring is fixedly connected between the vertical plate and the outer wall of the movable cavity and is used to move the inclined plate downward and reset.

8. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 7, characterized in that: The side of the top of the moving cavity close to the catalyst module is higher than the side away from the catalyst module, the highest point of the top of the moving cavity does not exceed the upper surface of the catalyst module, and the bottom of the moving cavity is not lower than the lower surface of the catalyst module; Initially, the right-angled trapezoidal block is located on the side of the moving cavity away from the supporting rod, the horizontal plate passes through the side of the moving cavity close to the supporting rod, the bottom end of the lifting plate abuts against the horizontal plate, and the tilting plate is completely in the moving cavity.

9. The method for removing CO from sintering flue gas after desulfurization and dust removal according to claim 1, characterized in that: The flue gas desulfurization treatment adopts dry desulfurization or semi-dry CFB desulfurization process. When the semi-dry CFB desulfurization process is adopted, a slaked lime injection system is added in front of the CFB desulfurization tower.

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