A method for post-removing CO after integration of denitrification and dust removal from sintering flue gas

Abstract

The present invention relates to the technical field of flue gas treatment, specifically to a method for post-removing CO after integrated denitrification and dust removal of sintering flue gas, which is specifically completed in cooperation with a sintering flue gas treatment system, including a GGH heat exchanger, a desulfurization reactor, a denitrification dust collector, and a CO reactor connected in sequence through pipelines. Ammonia is sprayed at the outlet of the desulfurization reactor, and the CO catalyst module is a transition metal oxide CO catalyst; it also includes a cleaning device for cleaning the CO catalyst module; by spraying ammonia at the outlet of the desulfurization reactor, the ammonia escape is reduced, thereby reducing the poisoning of the CO catalyst module, improving the catalytic efficiency of the CO catalyst module and prolonging its service life; by blowing air and back-blowing the CO catalyst module regularly in a closed area, the carbon deposits and other impurities on the CO catalyst module are cleaned, exposing more active sites and delaying the service life of the CO catalyst module. The use of a transition metal oxide CO catalyst reduces the investment and operating costs.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and specifically to a method for post-removing CO after integrated denitrification and dust removal of sintering flue gas. Background Technique

[0002] With the continuous deepening of the work on preventing and controlling air pollution, the requirements for carbon monoxide emissions have also increased. At present, the main control measures for particulate matter, NOx, SO 2 and CO in sintering flue gas are to adopt desulfurization + dust removal + SCR denitrification + CO reactor. The existing sintering flue gas treatment system has too high operating resistance, low dust filtration accuracy, and the denitrification and CO catalysts are prone to clogging. Moreover, SO 2 has large concentration fluctuations, which is likely to cause poisoning of the CO catalyst, resulting in a short service life; the precious metal catalysts used in the market, such as platinum and palladium, are expensive, with high operating costs. The entire sintering flue gas treatment system occupies a large area and requires high investment.

[0003] Based on this, the present invention provides a flue gas decarbonization method that can extend the service life of the CO catalyst and reduce the use cost of the CO catalyst. Summary of the Invention

[0004] The present invention provides a method for post-removing CO after integrated denitrification and dust removal of sintering flue gas, which is specifically completed in cooperation with a sintering flue gas treatment system. The system includes a GGH heat exchanger, a desulfurization reactor, a denitrification dust collector, and a CO reactor connected in sequence through pipelines. A multi-stage CO catalyst module is arranged inside the CO reactor. After the flue gas enters the GGH heat exchanger and is heated, it flows through the desulfurization reactor for desulfurization, then flows into the denitrification dust collector for denitrification and dust removal. After that, the flue gas after decarbonization in the CO reactor enters the GGH heat exchanger for heat exchange and then is discharged. Ammonia is sprayed at the outlet of the desulfurization reactor.

[0005] The sintering flue gas treatment system further includes a cleaning device for cleaning the CO catalyst module. The cleaning device includes a cleaning member for pressurized blowing of different local areas of the CO catalyst module. The cleaning member includes a closing part distributed on the upper and lower sides of the CO catalyst module and a blowing part for blowing air onto the upper surface of the CO catalyst module. The closing part includes an installation frame that reciprocates horizontally and a closing cover that slides up and down on one side of the installation frame. An anti-blowing part is arranged on the lower closing cover, and the working time of the anti-blowing part is shorter than that of the blowing part.

[0006] A one-way closing member is arranged inside the upper closing cover. The one-way closing member opens when the blowing part works and closes when the anti-blowing part works.

[0007] In a possible implementation manner, the mounting bracket is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate. A first spring is fixedly connected to the lower surface of the horizontal plate, and the upper end of the closed cover is fixedly connected to the first spring. A telescopic column is also fixedly connected to the top end of the closed cover, and the telescopic column slidably penetrates through the horizontal plate of the mounting bracket. A wedge-shaped top block is horizontally slidably arranged on the vertical plate of the mounting bracket, and the inclined surface of the wedge-shaped top block abuts and cooperates with the end of the telescopic column away from the closed cover.

[0008] In a possible implementation manner, the backwashing part includes a plurality of branch pipes arranged in the lower closed cover and a main pipe installed inside the closed cover. The main pipe is a loop-shaped pipe with unconnected ends. The plurality of branch pipes are fixedly connected and communicated with the main pipe, and a second inlet pipe is fixedly connected to the inlet end of the main pipe.

[0009] In a possible implementation manner, a dust discharging part is further arranged on the bottom wall of the lower closed cover. The dust discharging part includes a discharging slope arranged in the middle of the bottom wall of the lower closed cover. A guiding slope is arranged on each side of the bottom wall of the closed cover where the discharging slope is located. The height of the guiding slope on the side away from the discharging slope is higher than the height on the side close to the discharging slope. An ash outlet is opened on the side wall of the closed cover corresponding to the lowest point of the discharging slope.

[0010] In a possible implementation manner, the cleaning device further includes a moving driving group. The moving driving group includes a horizontal moving square pipe for pushing the mounting bracket to move horizontally back and forth and a moving part for pushing the wedge-shaped top block to move horizontally back and forth. The horizontal moving square pipe slidably penetrates through the outer shell of the CO reactor and is fixedly connected to the vertical plate of the mounting bracket. The moving part includes a pushing bar fixedly connected to the wedge-shaped top block and slidably penetrating through the outer shell of the CO reactor. The pushing bar can move horizontally relative to the horizontal moving square pipe.

[0011] In a possible implementation manner, an impact part is further arranged on the upper closed cover. The impact part includes a strip-shaped groove opened on the telescopic column and a lifting rod penetrating through a plurality of strip-shaped grooves. Cylinders are fixed at both the head and the tail ends of the lifting rod. The impact part further includes a horizontal bar fixed on the inner wall of the CO reactor and corresponding to the cylinder. A wavy groove is opened on the horizontal bar, and the cylinder is slidably arranged in the wavy groove. Connecting rods are fixedly connected to the lower end of the lifting rod corresponding to each telescopic column. The connecting rods penetrate through the closed cover and lead to the inside of the closed cover. The ends of the plurality of connecting rods are jointly connected to a synchronous plate, and a hammer head is fixedly connected to the bottom end of the synchronous plate.

[0012] In a possible implementation manner, the one-way closure member includes a fixed frame fixed to the inner wall of the closure cover and a lifting frame connected to the bottom of the fixed frame through a steel cable. Both the fixed frame and the lifting frame are in sliding contact with the synchronous plate, and the lifting frame is in sliding contact with the inner wall of the closure cover. Vent holes are provided on both the fixed frame and the lifting frame, and the vent holes on the lifting frame are in a trapezoidal shape that is smaller at the top and larger at the bottom. A trapezoidal sealing plate is provided in the trapezoidal vent hole. The upper end of the trapezoidal sealing plate is fixedly connected to the bottom of the fixed frame through a second spring. When there is no air pressure pushing on the upper side of the trapezoidal sealing plate, the trapezoidal sealing plate closes the trapezoidal vent hole.

[0013] In a possible implementation manner, a plurality of hammer heads are linearly distributed, and the impact positions of the hammer heads are sequentially cyclically distributed in the middle, on the right, and on the left.

[0014] In a possible implementation manner, a support member is further provided between the two transverse moving square tubes. The support member includes a fixed rod fixed between the free ends of the two transverse moving square tubes. The fixed rod is fixedly connected with a moving rod through a third spring. The moving rod is located between the two transverse moving square tubes, and the upper and lower ends of the moving rod are in sliding connection with the outer walls of the transverse moving square tubes.

[0015] In a possible implementation manner, the CO catalyst module is a transition metal oxide CO catalyst. The denitration dust collector and the denitration dust removal filter bag are integrally arranged. The sintered flue gas treatment system further includes a linkage device, and the linkage device can adjust the intake air volume of the hot blast stove through the temperature increased by absorbing heat after the flue gas is catalyzed by the CO catalyst module.

[0016] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0017] 1. By spraying ammonia at the outlet of the desulfurization reactor in the present invention, ammonia escape is reduced, thereby reducing the poisoning of the CO catalyst module and improving the catalytic efficiency and service life of the CO catalyst module; by regularly blowing air and back-blowing the CO catalyst module in the closed area, carbon deposits and other impurities on the CO catalyst module are cleaned, exposing more active sites and delaying the saturation time and service life of the CO catalyst module; the one-way closure member can prevent carbon deposits and impurities from piling up on the upper surface of the CO catalyst module when back-blowing the CO catalyst module, and using a transition metal oxide CO catalyst reduces the investment and operation costs.

[0018] 2. The present invention adopts a combined process of dry secondary fine desulfurization with baking soda and a high-efficiency denitration dust removal filter bag to improve the desulfurization and denitration efficiency, protect the CO catalyst module, and thereby improve the service life of the CO catalyst module.

[0019] 3. Through the integrated dust removal and denitrification setting, the present invention reduces the process link setting, decreases the floor area, and lowers the investment and operation costs.

[0020] 4. The heat released during decarbonization of the present invention is absorbed by the flue gas, and the flue gas with increased temperature is discharged after heat exchange through the GGH heat exchanger. When the flue gas enters the GGH heat exchanger from the flue gas duct after desulfurization, the temperature rise amplitude is greater, which can further reduce the consumption of hot blast stove gas.

[0021] 5. In addition to blowing air to the CO catalyst module, the present invention can also perform mechanical vibration on it, improving the dropping efficiency of carbon deposits and impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the flow chart of sintering flue gas treatment provided by the embodiment of the present invention.

[0023] Figure 2 is the three-dimensional structure schematic diagram of the CO reactor and the cleaning device provided by the embodiment of the present invention.

[0024] Figure 3 is the three-dimensional structure schematic diagram after the front side shell of the CO reactor provided by the embodiment of the present invention is opened.

[0025] Figure 4 is the three-dimensional structure schematic diagram of the cleaning part and the impact part provided by the embodiment of the present invention.

[0026] Figure 5 is the internal structure schematic diagram after the closed cover provided by the embodiment of the present invention is sectioned.

[0027] Figure 6 is the structure schematic diagram of the one-way closing part provided by the embodiment of the present invention.

[0028] Figure 7 is the three-dimensional structure schematic diagram of the transverse square pipe and the support provided by the embodiment of the present invention.

[0029] Figure 8 is the three-dimensional structure schematic diagram of the transverse square pipe, the support and the moving part provided by the embodiment of the present invention.

[0030] Figure 9 is the structure schematic diagram of the lower closed cover provided by the embodiment of the present invention.

[0031] Figure 10 is the partial structure schematic diagram of the backwashing part provided by the embodiment of the present invention.

[0032] Figure 11 is the structure schematic diagram of the ash discharging part provided by the embodiment of the present invention.

[0033] In the figure: 1. GGH heat exchanger; 2. Desulfurization reactor; 3. Denitration dust collector; 4. Denitration dust removal filter bag; 5. CO reactor; 6. CO catalyst module; 7. Cleaning device; 8. Fan; 9. Chimney; 10. Linkage device; 71. Cleaning part; 711. Mounting frame; 712. Enclosure; 713. Telescopic column; 714. First spring; 715. Wedge-shaped top block; 716. First intake pipe; 721. Main pipe; 722. Branch pipe; 723. Second intake pipe; 731. Feeding slope; 732. Discharging slope; 74. Impact part; 741. Strip groove; 742. Lifting rod; 743. Cylinder; 744. Horizontal bar; 745. Wavy groove; 746. Connecting rod; 747. Synchronous plate; 748. Hammer head; 751. Fixed frame; 752. Steel cable; 753. Lifting frame; 754. Trapezoidal sealing plate; 755. Second spring; 76. Transverse moving square pipe; 77. Support part; 771. Fixed rod; 772. Third spring; 773. Moving rod; 78. Moving part; 781. Pushing strip; 782. Connecting frame; 783. U-shaped plate; 784. Electric push rod. Detailed implementation manners

[0034] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation manners disclosed below.

[0035] Please refer to Figure 1 and Figure 3, A method for post-removing CO after integrated denitrification and dust removal of sintering flue gas is completed by using a sintering flue gas treatment system. The flue gas treatment system includes a GGH heat exchanger 1, a desulfurization reactor 2, a denitrification dust collector 3, and a CO reactor 5 connected in sequence through pipelines. The inlet end of the GGH heat exchanger 1 is connected to the external flue gas duct after desulfurization. The denitrification dust collector 3 is integrated with the denitrification and dust removal filter bag 4. A multi-stage CO catalyst module 6 is arranged inside the CO reactor 5. After primary desulfurization, the flue gas enters the GGH heat exchanger 1 from the flue gas duct after desulfurization. After being heated up by the GGH heat exchanger 1, it is further heated to 235°C by the gas from the hot blast stove, and then enters the desulfurization reactor 2 through a pipeline. Sodium bicarbonate as a desulfurizing agent is sprayed at the inlet of the desulfurization reactor 2 for secondary desulfurization of the flue gas. Ammonia is sprayed at the outlet of the desulfurization reactor 2 to carry out selective catalytic reduction reaction to improve the denitrification efficiency and reduce ammonia escape. Then the flue gas enters the denitrification dust collector 3 for denitrification, and the denitrification and dust removal are carried out by the denitrification and dust removal filter bag 4. Subsequently, the denitrified and dust-removed flue gas enters the CO reactor 5, and CO is removed under the catalytic action of the CO catalyst module 6. The reacted clean flue gas enters the GGH heat exchanger 1 for heat exchange, and finally the flue gas is discharged from the chimney 9 by the fan 8.

[0036] It should be noted that the CO catalyst module 6 is a transition metal oxide CO catalyst, which reduces the investment and operation costs compared with noble metals.

[0037] Please refer to Figure 1 , the filtration accuracy of the denitrification and dust removal filter bag 4 is 0.03 µm. The denitrification and dust removal filter bag 4 is a composite structure of an expanded polytetrafluoroethylene membrane and a catalyst polytetrafluoroethylene composite felt layer. When the flue gas enters the denitrification dust collector 3, the flue gas first contacts the expanded polytetrafluoroethylene membrane on the surface of the denitrification and dust removal filter bag 4, and the particulate matter in the flue gas is filtered and removed. The passed flue gas begins to contact the catalyst polytetrafluoroethylene composite felt layer. At this time, NOx in the flue gas reacts with the catalyst in the catalyst polytetrafluoroethylene composite felt layer to generate N 2 and H 2 O. When the flue gas passes through the catalyst polytetrafluoroethylene composite felt layer, the concentration of NOx in the flue gas is reduced to below the emission standard limit value. The catalyst here is a denitrification catalyst.

[0038] Please refer to Figure 2 and Figure 3 , the sintering flue gas treatment system further includes a cleaning device 7 for cleaning the CO catalyst module 6. The CO catalyst module 6 is regularly cleaned through the cleaning device 7 to restore the activity of the CO catalyst module 6, extend the service life of the CO catalyst module 6, and further reduce the cost of flue gas decarbonization.

[0039] Please refer to Figure 2 、 Figure 3 、Figure 4 and Figure 9 Inside the CO reactor 5, the CO catalyst modules 6 are evenly distributed from top to bottom. Each stage of the CO catalyst module 6 corresponds to a cleaning device 7. The cleaning device 7 includes a cleaning member 71 for pressurized blowing of different local areas of the CO catalyst module 6. The cleaning member 71 includes a closing portion symmetrically distributed on the upper and lower sides of the CO catalyst module 6 and a blowing portion for blowing air onto the upper surface of the CO catalyst module 6. The closing portion includes a mounting frame 711 that moves horizontally back and forth and a closing cover 712 that is slidably arranged up and down on one side of the mounting frame 711. When the mounting frame 711 drives the closing cover 712 to move horizontally, different areas of the CO catalyst module 6 can be selectively closed. When the two closing covers 712 approach each other, they will contact the outer surface of the CO catalyst module 6 and close a local area of the CO catalyst module 6. When the two closing covers 712 move away from each other, the closure of the local area of the CO catalyst module 6 is released; air is blown into the closed space through the blowing portion, and the high-speed ejected gas blows the carbon deposits, dust, and particulate matter on the CO catalyst module 6.

[0040] Please refer to Figure 4 As shown, the mounting frame 711 is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate. A first spring 714 is fixedly connected to the lower surface of the horizontal plate. The upper end of the closing cover 712 is fixedly connected to the first spring 714. A telescopic column 713 is also fixedly connected to the top end of the closing cover 712, and the telescopic column 713 slidably penetrates the horizontal plate of the mounting frame 711. A wedge-shaped top block 715 is horizontally slidably arranged on the vertical plate of the mounting frame 711, and the inclined surface of the wedge-shaped top block 715 abuts against the end of the telescopic column 713 away from the closing cover 712. When the wedge-shaped top block 715 moves horizontally, it will contact the telescopic column 713 and drive the closing cover 712 to slide in the vertical direction. The setting of the first spring 714 is to enable the telescopic column 713 to automatically drive the two closing covers 712 to separate when not pushed by the wedge-shaped top block 715, thereby releasing the closure of the local area of the CO catalyst module 6.

[0041] It should be noted that multiple first springs 714 and telescopic columns 713 are provided, and they are alternately distributed to ensure uniform force on the closing cover 712.

[0042] Please refer to Figure 5 As shown, the blowing portion is a first air inlet pipe 716. The first air inlet pipe 716 penetrates the outer wall of the CO reactor 5 and is connected to the vertical plate of the mounting frame 711 and then communicates with the upper closing cover 712. The first air inlet pipe 716 is connected to an external air pump, and the flow direction of the air flow is as indicated by the arrow in Figure 6 the figure.

[0043] Due to the relatively thick thickness of the CO catalyst module 6, when blowing air onto the upper surface of the CO catalyst module 6, the gas will encounter certain resistance and it is difficult to blow the carbon deposits, dust, and particulate matter near the lower surface of the CO catalyst module 6. In order to clean the CO catalyst module 6 more thoroughly, an anti-blowing part is provided on the lower closing cover 712, such as Figure 9 and Figure 10 shown. The anti-blowing part includes a plurality of branch pipes 722 arranged inside the lower closing cover 712 and a main pipe 721 installed inside the closing cover 712. The main pipe 721 is a loop-shaped pipe with its head and tail not connected. The plurality of branch pipes 722 are fixedly connected and communicated with the main pipe 721. The inlet end of the main pipe 721 is fixedly connected with a second inlet pipe 723, and the second inlet pipe 723 is supplied with gas by an external air pump.

[0044] It should be noted that the working time and working frequency of the anti-blowing part do not exceed those of the blowing part, ensuring that the overall carbon deposits, dust, and particulate matter blown off show a downward trend, which is convenient for later discharge.

[0045] Please refer to Figure 9 and Figure 11 . A dust discharging part is also provided on the bottom wall of the lower closing cover 712. The dust discharging part includes a material guiding slope 731 and a discharging slope 732. A discharging slope 732 is provided in the middle of the bottom wall of the lower closing cover 712. A material guiding slope 731 is provided on each side of the bottom wall of the closing cover 712 where the discharging slope 732 is located. The height of the side of the material guiding slope 731 far from the discharging slope 732 is higher than the height of the side close to the discharging slope 732. An ash outlet is opened on the side wall of the closing cover 712 corresponding to the lowest point of the discharging slope 732.

[0046] Please refer to Figure 2 , Figure 7 , Figure 8 and Figure 9 . The cleaning device 7 further includes a moving drive group. The moving drive group includes a horizontal moving square pipe 76 that pushes the mounting frame 711 to move horizontally back and forth and a moving part 78 that pushes the wedge-shaped top block 715 to move horizontally back and forth. The horizontal moving square pipe 76 slides through the outer shell of the CO reactor 5 and is fixedly connected to the vertical plate of the mounting frame 711. The first inlet pipe 716 is located in the upper horizontal moving square pipe 76, and the second inlet pipe 723 is located in the lower horizontal moving square pipe 76. Avoidance slot holes are opened on the vertical plates of the mounting frame 711 corresponding to the position of the horizontal moving square pipe 76 to facilitate the passing of the first inlet pipe 716 and the second inlet pipe 723. Among them, the avoidance slot hole on the mounting frame 711 located below is connected to the ash outlet on the lower closing cover 712 through a telescopic pipe (not shown in the figure), facilitating the carbon deposits, dust, and particulate matter blown off to be discharged from the ash outlet through the telescopic pipe into the lower horizontal moving square pipe 76.

[0047] It should be noted that a sealing door is hinged at the bottom of the horizontal moving square pipe 76 below. When the sealing door on the horizontal moving square pipe 76 moves outside the CO reactor 5, it can be opened to discharge carbon deposits, dust and particulate matter.

[0048] Please refer to Figure 7 and Figure 8 As shown in, a support member 77 is also provided between the two horizontal moving square pipes 76. The support member 77 includes a fixed rod 771 fixed between the free ends of the two horizontal moving square pipes 76. The fixed rod 771 is fixedly connected with a moving rod 773 through a third spring 772. The moving rod 773 is located between the two horizontal moving square pipes 76, and the upper and lower ends of the moving rod 773 are slidably connected to the outer walls of the horizontal moving square pipes 76. When the horizontal moving square pipe 76 pushes the cleaning member 71 to move inside the CO reactor 5, the moving rod 773 will gradually approach the outer wall of the CO reactor 5. When the moving rod 773 fits against the outer wall of the CO reactor 5 and the horizontal moving square pipe 76 is continuously pushed, the third spring 772 will be gradually compressed. At this time, the distance between the fixed rod 771 and the moving rod 773 will gradually decrease. The setting of the support member 77 ensures that the two relatively long horizontal moving square pipes 76 will not shift due to the cantilever effect.

[0049] Please refer to Figure 2 , Figure 4 and Figure 8 As shown in, the moving part 78 includes a push bar 781 fixedly connected to the wedge-shaped top block 715 and slidably penetrating through the outer shell of the CO reactor 5. The upper and lower two push bars 781 are fixedly connected through a connecting frame 782. The connecting frames 782 are distributed on both sides of the push bar 781, and the two connecting frames 782 are fixedly connected through a U-shaped plate 783. The U-shaped plate 783 is fixedly connected to the support member 77 through an electric push rod 784. Specifically, the U-shaped plate 783 is fixedly connected to the fixed rod 771 through the electric push rod 784. When the horizontal moving square pipe 76 moves, it will drive the moving part 78 to move synchronously. When the electric push rod 784 expands and contracts, the electric push rod 784 can drive the push bar 781 to move relative to the horizontal moving square pipe 76, so that the wedge-shaped top block 715 can push the telescopic column 713 and the closed cover 712, making the closed covers 712 approach or move away from each other.

[0050] Please refer to Figure 4 and Figure 5, in order to further enhance the dust cleaning effect of the blowing part and the back blowing part, an impact part 74 is also provided on the upper closed cover 712. The impact part 74 includes a strip-shaped groove 741 formed in the telescopic column 713 and a lifting rod 742 passing through a plurality of strip-shaped grooves 741. Cylinders 743 are fixed at both the head and the tail ends of the lifting rod 742. The impact part 74 further includes a cross bar 744 fixed to the inner wall of the CO reactor 5 and corresponding to the cylinder 743. A wavy groove 745 is formed in the cross bar 744. The cylinder 743 is slidably arranged in the wavy groove 745. A connecting rod 746 is fixedly connected to the lower end of the lifting rod 742 corresponding to each telescopic column 713. The connecting rod 746 passes through the closed cover 712 and leads to the inside of the closed cover 712. The ends of a plurality of connecting rods 746 are commonly connected to a synchronous plate 747, and a hammer head 748 is fixedly connected to the bottom end of the synchronous plate 747; a plurality of hammer heads 748 are linearly distributed, and the impact positions of the plurality of hammer heads 748 are sequentially and circularly distributed in the order of the middle, the right side, and the left side.

[0051] It should be noted that when the transverse moving square pipe 76 drives the cleaning member 71 to laterally move and switch the blowing position, the cylinder 743 will also be synchronously driven. At this time, the cylinder 743 moves in the wavy groove 745. The shape of the wavy groove 745 guides the cylinder 743 to reciprocate in the vertical direction, so that the cylinder 743 drives the lifting rod 742 to reciprocate up and down, and further drives the hammer head 748 to strike the upper surface of the CO catalyst module 6, vibrating the carbon deposits by mechanical knocking to make them easier to be blown off.

[0052] Please refer to Figure 5 and Figure 6 , in order to prevent dust from being blown into the upper transverse moving square pipe 76 during back blowing, a one-way closing member is also provided inside the upper closed cover 712. The one-way closing member includes a fixed frame 751 fixed to the inner wall of the closed cover 712 and a lifting frame 753 connected to the bottom of the fixed frame 751 through a steel cable 752. Both the fixed frame 751 and the lifting frame 753 are slidably connected to the synchronous plate 747. The lifting frame 753 is in sliding contact with the inner wall of the closed cover 712. Vent holes are formed in both the fixed frame 751 and the lifting frame 753, and the vent holes on the lifting frame 753 are trapezoidal with a smaller upper part and a larger lower part. A trapezoidal sealing plate 754 is arranged in the trapezoidal vent hole. The upper end of the trapezoidal sealing plate 754 is fixedly connected to the bottom of the fixed frame 751 through a second spring 755. When the trapezoidal sealing plate 754 is not pushed by air pressure, the trapezoidal sealing plate 754 closes the trapezoidal vent hole.

[0053] When blowing air, after the air flow enters the upper closed cover 712, it flows downward through the air-permeable holes on the fixed frame 751. The air pressure acts on the trapezoidal sealing plate 754 and presses the trapezoidal sealing plate 754 to move downward. At this time, the second spring 755 is gradually stretched, and the trapezoidal sealing plate 754 no longer closes the trapezoidal air-permeable holes. The air flow is discharged to the lower part from the space between the trapezoidal sealing plate 754 and the air-permeable holes, and finally blows to the upper surface of the CO catalyst module 6.

[0054] When backwashing, the air flow enters the lower closed cover 712 and blows to the lower surface of the CO catalyst module 6. The carbon deposits blown off will float upward. When the air flow gradually passes through the CO catalyst module 6 and overflows into the upper closed cover 712, the trapezoidal sealing plate 754 is closely attached to the trapezoidal air-permeable holes under the pulling force of the second spring 755 and the pushing action of the air flow. As the air pressure on the lower surface of the lifting frame 753 gradually increases, the lifting frame 753 moves upward under the push of the air pressure. The steel cable 752 changes from a hanging state to a coiled state. At this time, the space for closing the CO catalyst module 6 becomes larger. By moving the lifting frame 753 upward, not only the air pressure in the closed space of the CO catalyst module 6 is adjusted during backwashing, but also the carbon deposits can be prevented from being backwashed upward to the horizontal transfer pipe 76 above. During the next blowing, the floating carbon can be better blown down into the lower closed cover 712.

[0055] Please refer to Figure 1 , the sintered flue gas treatment system further includes a linkage device 10. The linkage device 10 can adjust the intake air volume of the hot blast stove by the temperature increased after the flue gas is catalyzed by the CO catalyst and absorbs heat.

[0056] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0057] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "set", "connected", "installed" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection, or a sliding connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A method for removing CO from sintering flue gas after integrated denitration and dust removal, which is specifically completed by using a sintering flue gas treatment system, comprising a GGH heat exchanger (1), a desulfurization reactor (2), a denitration dust collector (3), and a CO reactor (5) which are sequentially connected through pipelines, wherein a multi-stage CO catalyst module (6) is arranged inside the CO reactor (5), and the flue gas enters the GGH heat exchanger (1) and is heated, then flows through the desulfurization reactor (2) for desulfurization, then flows into the denitration dust collector (3) for denitration and dust removal, and then the flue gas after decarbonization through the CO reactor (5) enters the GGH heat exchanger (1) for heat exchange and then is discharged, characterized in that: Ammonia is sprayed into the outlet of the desulfurization reactor (2), and the CO catalyst module (6) is a transition metal oxide CO catalyst; The sintering flue gas treatment system also includes a cleaning device (7) for cleaning the CO catalyst module (6), the cleaning device (7) including a cleaning member (71) for pressurized blowing of different local areas of the CO catalyst module (6), the cleaning member (71) including a sealing portion distributed on the upper and lower sides of the CO catalyst module (6) and a blowing portion for blowing air toward the upper surface of the CO catalyst module (6), the sealing portion including a mounting frame (711) that moves back and forth laterally and a sealing cover (712) that is slidably arranged on one side of the mounting frame (711), a back-blowing portion is arranged on the lower back-blowing cover (712), and the working time of the back-blowing portion is shorter than that of the blowing portion; A one-way sealing member is arranged in the upper sealing cover (712). When the air blowing part is working, the one-way sealing member is opened, and when the back-blowing part is working, the one-way sealing member is closed.

2. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The mounting frame (711) is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate. A No. 1 spring (714) is fixedly connected to the lower surface of the horizontal plate. The upper end of the closing cover (712) is fixedly connected to the No. 1 spring (714). A telescopic column (713) is also fixedly connected to the top end of the closing cover (712). The telescopic column (713) slides through the horizontal plate of the mounting frame (711). A wedge-shaped top block (715) is horizontally slidably arranged on the vertical plate of the mounting frame (711). The inclined surface of the wedge-shaped top block (715) abuts against one end of the telescopic column (713) away from the closing cover (712).

3. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The back-blowing section comprises a plurality of branch pipes (722) arranged in a lower closed cover (712) and a main pipe (721) installed inside the closed cover (712); the main pipe (721) is a circular pipe that is not connected at the head and tail; the plurality of branch pipes (722) are fixed and connected to the main pipe (721); and the inlet end of the main pipe (721) is fixedly connected to a second air inlet pipe (723).

4. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The bottom wall of the lower closed cover (712) is also provided with an ash discharge portion, which includes a discharge slope (732) arranged in the middle of the bottom wall of the lower closed cover (712), and the bottom wall of the closed cover (712) is located on both sides of the discharge slope (732) and is provided with a guide slope (731), the height of the guide slope (731) away from the discharge slope (732) is higher than the height of the side close to the discharge slope (732), and the side wall of the closed cover (712) is provided with an ash outlet at the lowest point of the discharge slope (732).

5. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 2, characterized in that: The cleaning device (7) further comprises a moving drive group, the moving drive group comprising a transverse square tube (76) for pushing the mounting frame (711) to move back and forth in a transverse direction, and a moving part (78) for pushing the wedge-shaped top block (715) to move back and forth in a transverse direction, the transverse square tube (76) slidingly passes through the outer shell of the CO reactor (5) and is fixedly connected to the vertical plate of the mounting frame (711), the moving part (78) comprising a pushing bar (781) fixed to the wedge-shaped top block (715) and slidingly passing through the outer shell of the CO reactor (5), the pushing bar (781) being capable of moving laterally relative to the transverse square tube (76).

6. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 2, characterized in that: The upper sealing cover (712) is also provided with an impact part (74), the impact part (74) comprising a strip groove (741) provided on the telescopic column (713) and a lifting rod (742) penetrating the plurality of strip grooves (741), the lifting rod (742) being fixed with a cylinder (743) at both ends, the impact part (74) further comprising a horizontal bar (744) fixed to the inner wall of the CO reactor (5) and corresponding to the cylinder (743), the horizontal bar (744) being provided with a A wave-shaped groove (745) is provided, and a cylinder (743) is slidably arranged in the wave-shaped groove (745). The lower end of the lifting rod (742) is fixedly connected with a connecting rod (746) corresponding to the position of each telescopic column (713). The connecting rod (746) passes through the closed cover (712) and leads to the inside of the closed cover (712). The ends of the plurality of connecting rods (746) are commonly connected with a synchronous plate (747), and the bottom end of the synchronous plate (747) is fixedly connected with a hammer head (748).

7. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 6, characterized in that: The one-way sealing member comprises a fixed frame (751) fixed to the inner wall of the sealing cover (712) and a lifting frame (753) connected to the bottom of the fixed frame (751) through a steel cable (752). The fixed frame (751) and the lifting frame (753) are both in sliding contact with the synchronous plate (747). The lifting frame (753) is in sliding contact with the inner wall of the sealing cover (712). Air holes are provided on the fixed frame (751) and the lifting frame (753). The air holes on the lifting frame (753) are in a trapezoidal shape with a small top and a large bottom. A trapezoidal sealing plate (754) is provided in the trapezoidal air holes. The upper end of the trapezoidal sealing plate (754) is fixedly connected to the bottom of the fixed frame (751) through a No. 2 spring (755). When the upper side of the trapezoidal sealing plate (754) is not pushed by air pressure, the trapezoidal sealing plate (754) seals the trapezoidal air holes.

8. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 6, characterized in that: There are a plurality of hammer heads (748) distributed linearly, and the impact positions of the hammer heads (748) are cyclically distributed in the middle, right side, and left side in sequence.

9. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 5, characterized in that: A support member (77) is also provided between the two transverse square tubes (76), and the support member (77) comprises a fixed rod (771) fixed between the free ends of the two transverse square tubes (76), and the fixed rod (771) is fixedly connected to a moving rod (773) via a No. 3 spring (772), and the moving rod (773) is located between the two transverse square tubes (76), and the upper and lower ends of the moving rod (773) are slidably connected to the outer wall of the transverse square tube (76).

10. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 5, characterized in that: The denitration dust collector (3) and the denitration dust filter bag (4) are arranged in an integrated manner. The sintering flue gas treatment system also includes a linkage device (10). The linkage device (10) can adjust the air intake of the hot blast furnace by increasing the temperature of the flue gas after absorbing heat after being catalyzed by the CO catalyst module (6).

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