A system and method for reducing carbon monoxide concentration in sintering flue gas

Abstract

A system and method for reducing the carbon monoxide concentration in sintering flue gas comprises an air inlet duct connected to a flue gas outlet, an adsorption chamber mounted on the air inlet duct, the upper end of the adsorption chamber connected to an air outlet duct, a first ionization treatment chamber fixedly connected to a combustion chamber, an air guide fixed to the upper end of the combustion chamber, an air guide fixed to the upper end of the air guide, a buffer chamber fixed to the upper end of the buffer chamber, the outlet of the buffer chamber connected to the first treatment chamber via a connecting pipe, the outlet of the first treatment chamber connected to the inlet of the second treatment chamber, the outlet of the second treatment chamber connected to the inlet of a cyclone centrifuge, the outlet of the cyclone centrifuge connected to the inlet of a third treatment chamber via a connecting pipe, the outlet of the third treatment chamber connected to a blower via a connecting pipe, and the blower connected to an exhaust pipe. By adopting the present invention, the carbon monoxide removal rate in sintering flue gas can reach 97%, and the sulfur oxide removal rate can reach 95%, effectively reducing the pollution caused by flue gas emissions to the environment.

Description

Technical Field

[0001] The present invention relates to a flue gas treatment technology, in particular to a system and method for reducing the carbon monoxide concentration of sintering flue gas. Background Art

[0002] Steel companies generate a large amount of atmospheric pollutants during the production process, and sintering production is one of the important process units in steel production. The CO in sintering flue gas mainly comes from the combustion of fixed carbon in solid fuels. Less CO is generated from the combustion of volatile matter, and the gasification reaction of C and O and the incomplete combustion caused by the local low-oxygen atmosphere in the sintering material layer are the main reasons for the generation of CO. Affected by the negative pressure of the exhaust, the gas flow rate in the material layer is relatively fast. The CO generated during the combustion process is carried out of the combustion zone before it can participate in the secondary combustion. In addition, the temperature of the flue gas drops rapidly to below the ignition temperature due to the gas-solid heat exchange with the material layer. Therefore, the CO in the flue gas cannot be burned out and is carried into the large flue. A large amount of flue gas is generated during the production process. The flue gas contains a large amount of sulfur oxides and carbon monoxide. Direct emission causes serious environmental pollution. Therefore, the sintering flue gas needs to be purified before it can be discharged.

[0003] The existing sintering high-temperature CO-containing flue gas treatment system has the following process flow: flue gas → water-cooled flue → four-stage settling chamber cooler → air-cooled jacket cooler → raw gas booster fan → bag filter → clean gas booster fan → water-cooled scrubber → purified flue gas discharge. This method uses a water-cooled flue gas duct for cooling, and a water-cooled scrubber to filter flue gas particles. However, this method is ineffective at trapping and removing CO formed in the flue gas, achieving only a 75%-85% removal rate for sulfur oxides. This results in poor purification efficiency and still significant emissions. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of the prior art and to provide a system and method for reducing the carbon monoxide concentration in sintering flue gas, which can ensure ultra-low concentration emissions of pollutants such as SO2, CO, and dust in the sintering flue gas.

[0005] The problem described in the present invention is solved by the following technical solutions:

[0006] A system for reducing the carbon monoxide concentration in sintering flue gas comprises an air intake duct connected to a flue gas exhaust port, an adsorption chamber installed on the air intake duct, the upper end of the adsorption chamber being connected to an air outlet duct, the air outlet duct being provided with a first ionization treatment chamber, the outlet end of the first ionization treatment chamber being fixedly connected to a combustion chamber, an air guide pipe being fixed to the upper end of the combustion chamber, the upper end of the air guide pipe being fixedly connected to a buffer chamber, the outlet end of the buffer chamber being connected to the first treatment chamber via a connecting pipe, the outlet end of the first treatment chamber being connected to the inlet end of the second treatment chamber via a connecting pipe provided with a second ionization chamber, the outlet end of the second treatment chamber being connected to the inlet end of a cyclone centrifuge via a connecting pipe, the outlet end of the cyclone centrifuge being connected to the inlet end of a third treatment chamber via a connecting pipe, the outlet end of the third treatment chamber being connected to a blower via a connecting pipe, and the blower being connected to an external exhaust duct.

[0007] The system for reducing the carbon monoxide concentration in sintering flue gas is provided with a catalytic oxidation plate or a filter assembly consisting of multiple filter units in the buffer bin, wherein the filter units include a dry filter unit, a UV photocatalytic oxidation unit, a honeycomb mesh catalyst unit, and a catalytic adsorption unit, and the dry filter unit, the UV photocatalytic oxidation unit, the honeycomb mesh catalyst unit, and the catalytic adsorption unit are sequentially connected and arranged in series;

[0008] The dry filtration unit, UV photocatalytic oxidation unit, honeycomb mesh catalyst unit, and catalytic adsorption unit are independent box units;

[0009] The dry filter unit is provided with three types of filters: primary efficiency, medium efficiency and high efficiency, wherein the primary efficiency, medium efficiency and high efficiency filters are respectively metal mesh filter, polyester breathable cloth filter and glass fiber filter;

[0010] The UV photocatalytic oxidation unit is a vertical drawer structure, and multiple drawers are arranged at intervals, and mesh holes are opened on the drawer surface in the direction of the smoke flow of each drawer, and all are arranged in a connected manner;

[0011] The honeycomb mesh catalyst unit is a vertical drawer structure, and multiple drawers are arranged at intervals. The drawer surface of each drawer in the direction of the smoke flow is provided with mesh holes, which are all interconnected, and the honeycomb mesh catalyst is embedded in the drawer in a block shape;

[0012] The catalytic adsorption unit is a vertical drawer structure, and multiple units are arranged at intervals. Catalyst blocks are embedded in the catalytic adsorption unit. The drawer surface of each drawer in the direction of the flue gas flow is provided with mesh holes, which are all arranged in a connected manner.

[0013] The catalyst block is a rectangular block with honeycomb holes made of rare metal, a rectangular block with honeycomb holes made of composite metal, or a rectangular block with honeycomb holes made of noble metal.

[0014] In the above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, the first treatment chamber is divided into three compartments, namely the first compartment, the second compartment and the third compartment, wherein the first compartment is a water storage chamber, the second compartment is a spray chamber, and the third compartment is an adsorption treatment chamber; the first compartment, the second compartment and the third compartment are connected, and a mesh layer is provided in the first compartment, and an auxiliary component is fixed at the center of the mesh layer by a connecting rod.

[0015] In the above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, a pressurized injection pipe is fixedly provided in the first processing chamber, and the pressurized injection pipe is evenly distributed along the inner wall of the first processing chamber, and the pipe head of the pressurized injection pipe is located in the first processing chamber below the liquid level in the first processing chamber;

[0016] The pressurized injection pipe is externally connected to a pressurized pump, and the mesh layer is located in the first processing chamber 10-15 centimeters higher than the air inlet;

[0017] A spray plate is provided in the second compartment, spray pipes are evenly distributed on the spray plate, and a spray head is installed on the spray pipes;

[0018] The spray pipes are evenly distributed around the circumference, and the spray heads are densely arranged around the circumference at the center of the spray pipes. The spray plates are arranged in at least two layers in the second compartment.

[0019] In the above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, an upper adsorption plate is fixedly provided at the outlet position at the upper end of the first processing chamber. The upper adsorption plate is provided with multiple layers and has ventilation channels. The ventilation channels are wavy or corrugated in shape, and the ventilation channels scatter from the center of the upper adsorption plate to both sides.

[0020] The upper adsorption plate has two shapes: concave arc type or convex arc type, and the two types are arranged alternately up and down;

[0021] The concave arc shape of the upper adsorption plate is concave downward from the center of the upper adsorption plate;

[0022] The convex arc shape of the upper adsorption plate protrudes upward from the center of the upper adsorption plate;

[0023] The ventilation channel is wavy or corrugated.

[0024] The above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, the second processing chamber is a hollow cavity structure, springs are fixed on the upper and lower inner walls of the second processing chamber, the springs are connected to the extrusion plates, the two extrusion plates are symmetrically arranged up and down, and the extrusion plates are provided with plug-in slots, the plug-in slots are plugged into the adsorption plates, the adsorption plates are composed of multi-layer honeycomb hole plates, the lower end of the second processing chamber is connected to a hollow ash receiving trough by screwing, the position corresponding to the adsorption plate on the lower extrusion plate is hollow, and the hollow position is connected to the ash receiving trough.

[0025] The above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, the third processing chamber is a hollow structure, and a filter plate group is provided in the third processing chamber, the filter plate group is composed of a plurality of filter plates arranged in parallel, the plate surface of the filter plate is arranged in a wavy or corrugated shape, and there is a hollow shape between two opposite wavy or corrugated shapes, and an activated carbon layer is provided in the hollow cavity.

[0026] In the above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, the first ionization treatment chamber and the second ionization treatment chamber adopt the same structure. The first ionization treatment chamber and the second ionization treatment chamber are both arranged in sections. The pipes where the first ionization treatment chamber and the second ionization treatment chamber are located are square pipes. Several ionization wires are arranged in parallel in the first ionization treatment chamber and the second ionization treatment chamber along the direction of the flue gas, and the two ends of the ionization wires are fixed on the inner walls of the first ionization treatment chamber and the second ionization treatment chamber.

[0027] In the above-mentioned system for reducing the carbon monoxide concentration in sintering flue gas, the adsorption chamber is a vertical pipe structure, and several adsorption chambers are arranged in parallel. A first spiral tube is provided on the inner wall of the adsorption chamber, and the first spiral tube is an open spiral tube. A second spiral tube is provided on the outer circumference of the adsorption chamber, and the second spiral tube is a cylindrical hollow spiral tube.

[0028] A method for reducing the carbon monoxide concentration in sintering flue gas comprises the following steps:

[0029] In the first step, the flue gas is pre-treated by passing through the adsorption chamber to roughly filter the flue gas;

[0030] In the second step, the flue gas filtered in the first step is ionized in the first ionization treatment chamber. The first ionization treatment chamber is segmented and has multiple chamber structures arranged in parallel in the horizontal or vertical direction. The flue gas is ionized in the ionization channel formed by the first ionization treatment chamber, and then passes through the combustion chamber for high-temperature combustion at a temperature of 90-120 degrees Celsius and a pressure of 6 MPa, and is discharged through the air duct at an accelerated speed.

[0031] In the third step, the flue gas treated in the second step is catalytically oxidized through a buffer chamber or refiltered through a filter assembly composed of multiple filter units in the buffer chamber. The flue gas treated in the buffer chamber flows through the first treatment chamber for water washing and is filtered through the upper adsorption plate in the first treatment chamber.

[0032] In the fourth step, the flue gas treated in the first treatment chamber is ionized in the second ionization treatment chamber and then transported to the second treatment chamber;

[0033] The ionization voltage of the second ionization processing chamber is lower than the ionization voltage of the first ionization processing chamber;

[0034] In the fifth step, the flue gas in the fourth step is filtered and processed in the second processing chamber, which adopts a vertical structure and a horizontal smoke inlet method;

[0035] In the sixth step, the flue gas treated in the second treatment chamber is processed by a cyclone centrifuge, and the dust and small particles in the flue gas are discharged from the bottom after centrifugal treatment. The flue gas is transported to the third treatment chamber through the air supply channel of the cyclone centrifuge;

[0036] In the seventh step, the third processing chamber adopts a vertical structure and uses a bottom air supply and upper air outlet structure to treat the flue gas.

[0037] The present invention addresses the issue of improving carbon monoxide removal from sintering flue gas by designing a system for reducing carbon monoxide concentration in sintering flue gas. This system treats the incoming sintering flue gas through a series of steps, including pretreatment, secondary ionization, catalytic oxidation, and filtration. This comprehensive treatment ensures ultra-low emission of pollutants such as SO2, CO, and dust, significantly reducing the concentrations of carbon monoxide and other harmful substances in the sintering flue gas. Testing has shown that the present invention achieves a carbon monoxide removal rate of 97% and a sulfur oxide removal rate of 95% in sintering flue gas, effectively reducing environmental pollution caused by flue gas emissions and having significant practical and long-term significance for the sustainable development of steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] Figure 1 is a schematic diagram of the system of the present invention;

[0040] Figure 2 is a schematic diagram of the first processing chamber;

[0041] Figure 3 is a schematic diagram of the mesh layer;

[0042] Figure 4 is a schematic diagram of the auxiliary parts;

[0043] Figure 5 It is a schematic diagram of the buffer bin;

[0044] Figure 6 a schematic diagram of the second processing chamber;

[0045] Figure 7 is a schematic diagram of the filter plate;

[0046] Figure 8 is a schematic diagram of the filter plate group;

[0047] Figure 9 is a schematic diagram of the spray plate;

[0048] Figure 10 is a schematic diagram of the upper adsorption plate.

[0049] The numbers in the figure are: 1, adsorption chamber, 1-1, air inlet pipe, 1-2, air outlet pipe, 2, first ionization treatment chamber, 3, combustion chamber, 4, air guide pipe, 5, buffer chamber, 5-1, filter unit, 5-2, UV photocatalytic oxidation unit, 5-3, honeycomb mesh catalyst unit, 5-4, catalyst unit, 6, first treatment chamber, 6-0, first compartment, 6-1, mesh layer, 6-2, second compartment, 6-3, third compartment, 6-4, auxiliary parts, 7, second ionization treatment chamber, 8, second treatment chamber, 9, cyclone centrifuge, 10, third treatment chamber, 11, spray plate, 12, nozzle, 13, upper adsorption plate, 14, ventilation channel, 15, plug-in slot, 16, adsorption plate, 17, spring group, 18, filter plate group, 19, filter plate. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, a device for reducing the carbon monoxide concentration in sintering flue gas comprises an air intake pipe 1-1 connected to a carbon monoxide flue gas discharge port, an adsorption chamber 1 fixedly connected to the air intake pipe 1-1, the upper end of the adsorption chamber 1 fixedly connected to an air outlet pipe 1-2, a first ionization treatment chamber 2 fixedly provided on the air outlet pipe 1-2, the outlet end of the ionization treatment chamber 2 fixedly connected to a combustion chamber 3, an air guide pipe 4 fixedly provided on the upper end of the combustion chamber 3, a buffer chamber 5 fixedly connected to the upper end of the air guide pipe 4, the outlet end of the buffer chamber 5 is connected to a first treatment chamber 6 through a connecting pipe, the outlet end of the first treatment chamber 6 is connected to an inlet end of a second treatment chamber 8 through a connecting pipe, the outlet end of the second treatment chamber 8 is connected to an inlet end of a cyclone centrifuge 9 through a connecting pipe, the outlet end of the cyclone centrifuge 9 is connected to an inlet end of a third treatment chamber 10 through a connecting pipe, the outlet end of the third treatment chamber 10 is connected to a blower through a connecting pipe, and the blower is connected to an external exhaust pipe. The blower is convenient for smoke exhaust. The bottom of the cyclone centrifuge is conical, and a double-layer bushing is provided at the bottom of the cone. The bushing is connected to the inner wall of the cyclone centrifuge by a spring group. This setting can reduce the corrosion of the inner wall of the cyclone centrifuge when it is working, and can also reduce the vibration caused by the operation of the cyclone centrifuge.

[0052] To facilitate pretreatment of the exhaust flue gas during use, a further preferred embodiment of the present invention is that the adsorption chamber 1 is a vertical pipe structure, and multiple adsorption chambers 1 are arranged in parallel to form multiple air ducts. The first spiral tube located on the inner wall of the adsorption chamber 1 is an open spiral tube, and a second spiral tube is arranged on the outer circumference of the adsorption chamber 1. The second spiral tube is a cylindrical hollow spiral tube. The first spiral tube on the inner wall of the adsorption chamber 1 is mainly grooved along the spiral direction of the first spiral tube, which reduces the flue gas emission rate and enables pretreatment and filtration. The bottom of the notch in the first spiral tube is filled with filter cotton, which provides a sound-absorbing effect and achieves coarse filtration. The bottom pipe opening of the first spiral tube on the inner wall of the adsorption chamber 1 is connected to the air intake pipe 1-1. Multiple first spiral tubes are arranged in an array. The second spiral tube on the outer circumference of the adsorption chamber 1 is also grooved along the spiral direction of the second spiral tube. The groove is inlaid with a sound-insulating foam layer, and the second spiral tube is provided with multiple through holes to facilitate noise reduction.

[0053] To facilitate the disinfection and decomposition of flue gas during use, a further preferred embodiment of the present invention is that the first ionization treatment chamber 2 is arranged in sections (multiple parallel, interconnected chamber structures are arranged horizontally or vertically), each first ionization treatment chamber 2 is arranged in parallel, and the pipes containing the first ionization treatment chambers 2 are square pipes. Several ionization filaments are arranged in parallel within the first ionization treatment chamber 2 along the direction of the flue gas flow, with both ends of the ionization filaments fixed to the inner walls of the first ionization treatment chamber 2. The first ionization treatment chamber 2 is connected to an external high-voltage power supply for flue gas ionization.

[0054] In order to facilitate the increase of active ion components in the flue gas for adsorption during use, a further preferred embodiment of the present invention is that a second ionization treatment chamber 7 is provided on the pipe connecting the first treatment chamber 6 and the second treatment chamber 8. The second ionization treatment chamber 7 is arranged in sections, and each second ionization treatment chamber 7 is arranged in parallel. The pipe where the second ionization treatment chamber 7 is located is a square pipe. Several ionization wires are arranged in parallel along the direction of the flue gas in the second ionization treatment chamber 7, and the ionization wires are fixed on the inner wall of the second ionization treatment chamber 7. The second ionization treatment chamber 7 is connected to an external high-voltage power supply for flue gas ionization. The role of the first ionization and the second ionization in flue gas treatment is to change the state of particles in the flue gas by ionization, and at the same time form micro-ozone to combine with flue gas sterilization.

[0055] In order to facilitate the secondary incineration treatment of insufficiently decomposed CO during use, a further preferred embodiment of the present invention is that a number of the air ducts 4 are arranged in a matrix, and a filter layer is fixedly provided at the connection between the air duct 4 and the buffer bin 5; the provision of multiple groups of corresponding air ducts can avoid direct contact between the combustion bin and the buffer bin during use, buffer the impulse of the combustion in the combustion bin, reduce the local impact of the flue gas from the combustion bin on the catalyst plate in the buffer bin, and reduce the failure rate of the catalyst plate.

[0056] See Figure 5 The buffer bin 5 is a filter assembly consisting of multiple filter units, which include a dry filter unit 5-1, a UV photocatalytic oxidation unit 5-2 (UV light tubes are fixed at intervals in the UV photocatalytic oxidation unit), a honeycomb mesh catalyst unit 5-3, and a catalytic adsorption unit 5-4. The dry filter unit 5-1, the UV photocatalytic oxidation unit 5-2, the honeycomb mesh catalyst unit 5-3, and the catalytic adsorption unit 5-4 are connected and arranged in series; the dry filter unit, the UV photocatalytic oxidation unit, the honeycomb mesh catalyst unit, and the catalytic adsorption unit are all independent box units. The dry filter unit includes three levels of filtration, namely primary, medium, and high efficiency filters. The primary, medium, and high efficiency filters are metal mesh filtration, polyester breathable cloth filtration, and glass fiber filtration respectively. The UV photocatalytic oxidation unit is a vertical drawer structure, with multiple units arranged at intervals, and each drawer has a mesh opening on the drawer surface in the direction of the smoke flow, which are all connected. The honeycomb mesh catalyst unit is a vertical drawer structure with multiple units spaced apart. Each drawer has mesh holes on the drawer surface facing the direction of the flue gas flow, and all units are interconnected. The honeycomb mesh catalyst (a catalytic oxidation material primarily composed of platinum, palladium, and gold as active ingredients) is embedded in the drawer in block form. The catalytic adsorption unit is a vertical drawer structure with multiple units spaced apart. Catalyst blocks are embedded in the catalytic adsorption unit. Each drawer has mesh holes on the drawer surface facing the direction of the flue gas flow, and all units are interconnected. The catalyst blocks are rectangular blocks with honeycomb holes made of rare metals, composite metals, or precious metals. Catalytic adsorption unit 5-4 and the honeycomb mesh catalyst unit 5-3 use catalysts made of different metals.

[0057] The catalyst plate adopts a metal or rare metal catalyst made of metal mesh, which combines with carbon monoxide in the flue gas to reduce the content of carbon monoxide. The corresponding catalyst plate is set to catalytically oxidize the residual CO.

[0058] As an embodiment of the present invention, a catalytic oxidation plate (a catalytic oxidation material mainly composed of platinum and palladium active ingredients) can also be installed in the buffer bin 5. The catalytic oxidation plate is fixed in the buffer bin 5 in a waist drum shape to catalytically oxidize the flue gas passing through the buffer bin.

[0059] See Figure 2-Figure 4 The first treatment chamber is divided into three compartments: the first compartment 6-0 is a water storage chamber, the second compartment 6-2 is a spray chamber, and the third compartment 6-3 is an adsorption chamber. The first, second, and third compartments are interconnected. A mesh layer 6-1 is fixed to the first compartment. An auxiliary component 6-4 is fixed to the center of the mesh layer via a connecting rod (the area where the connecting rod is located is solid, and the area outside the area where the connecting rod is located is meshed). The auxiliary component is a plate, sector, or spherical structure. All of the auxiliary components are hollow and extend from the center of the mesh layer to a position 10-30 cm from the outlet of the first treatment chamber. To facilitate adequate flue gas integration during use, a further preferred embodiment of the present invention provides a fixed pressure injection pipe within the first treatment chamber 6. The pressure injection pipes are evenly distributed along the inner wall of the first treatment chamber, with their tips located within the first treatment chamber, below the liquid level. The pressure injection pipes are externally connected to a pressure pump. The mesh layer is positioned 10-15 centimeters above the air inlet in the first processing chamber. The present invention includes auxiliary components to facilitate mixing of water vapor, material, and flue gas during use with the pressurized injection pipe. When the pressurized injection pipe is operated by an external pressure pump, the sprayed water strikes the auxiliary components, which scatter them in different directions. This, in conjunction with the spray plate, enhances the mixing effect.

[0060] See Figure 9 A spray plate 11 is fixedly installed in the second compartment 6-2. Spray pipes are evenly distributed on the spray plate 11. Spray heads 12 are fixedly mounted on the spray pipes, facing the liquid surface. The spray pipes are evenly distributed around the circumference, with a dense, circular arrangement of spray heads 12 located at the center of the spray pipe. Spray plates 11 are arranged in at least two layers within the second compartment.

[0061] See Figure 10To facilitate adsorption of treated flue gas mist during use, a further preferred embodiment of the present invention provides an upper adsorption plate 13 fixedly positioned at the outlet of the upper end of the first treatment chamber 6. The upper adsorption plate 13 is constructed of multiple layers and has fixed ventilation channels 14 formed in a wavy or corrugated shape, radiating from the center of the upper adsorption plate to both sides. The upper adsorption plates 13 can be arranged in either a concave or convex configuration. The concave configuration is concave from the center of the upper adsorption plate, while the convex configuration is convex from the center. Both configurations are arranged in alternating intervals. The concave and convex configurations operate as follows: both concave and convex configurations are arranged in an interval, with the concave and convex configurations spaced opposite each other. This spacing increases the length of the buffer channel, facilitating adsorption. The wavy or corrugated configuration reduces airflow velocity during use, promoting the capture and adsorption of untreated particles in the flue gas, while also eliminating mist from the first treatment chamber. The upper adsorption plate can adsorb dust or particles in smoke or water vapor when adsorbing. The wavy or corrugated ventilation channel structure ensures that the smoke particles passing through are adsorbed during use, while increasing the length of the adsorption flue.

[0062] See Figure 6 To facilitate disassembly and installation during use, a further preferred embodiment of the present invention is that the second processing chamber 8 has a hollow cavity structure. Springs 17 are fixed to the upper and lower inner walls of the second processing chamber, connecting the two extrusion plates. The two extrusion plates are symmetrically arranged vertically. Each extrusion plate has a socket 15, which receives an adsorption plate 16, which is composed of a multi-layer honeycomb plate. A hollow ash receiving trough is screwed to the lower end of the second processing chamber 8. The area corresponding to the adsorption plate on the lower extrusion plate is hollowed out and communicates with the ash receiving trough.

[0063] See Figure 7 、 Figure 8To facilitate achieving an overall filtration effect during use, a further preferred embodiment of the present invention is that the third processing chamber 10 is a hollow structure, and a filter plate assembly 18 is connected to the third processing chamber 10 by screwing or welding. The filter plate assembly 18 is composed of a plurality of parallel individual filter plates 19. The surface of the individual filter plates is wavy or corrugated, and there is a hollow space between two opposing wavy or corrugated shapes, with an activated carbon layer within the hollow cavity. The present invention forms a single filter plate by forming two opposing wavy or corrugated shapes, allowing flue gas to ventilate between the two opposing wavy or corrugated shapes. At the same time, a pulse flushing pipe is fixedly installed in the third processing chamber 10. The pulse flushing pipe corresponds to the airway position between the two opposing wavy or corrugated shapes. If the pressure increases during filtration, the pressure is displayed by a pressure gauge installed on the third processing chamber 10. High pressure indicates that there is a blockage in the third processing chamber 10, reducing the treatment effect. At this time, the pulse flushing pipe flushes the individual filter plates through the action of pulses.

[0064] The method for reducing the carbon monoxide concentration in sintering flue gas of the present invention is implemented on the system for reducing the carbon monoxide concentration in sintering flue gas, and comprises the following steps:

[0065] In the first step, the flue gas is pre-treated by passing through the adsorption chamber 1 and the flue gas is initially coarsely filtered;

[0066] In the second step, the flue gas filtered in the first step is ionized in the first ionization treatment chamber 2. The first ionization treatment chamber 2 is segmented and has multiple parallel and interconnected chamber structures arranged horizontally or vertically. The flue gas is ionized in the ionization channel formed by the first ionization treatment chamber 2 and then passes through the combustion chamber 3 for high-temperature combustion at a temperature of 90-120 degrees Celsius and a pressure of 6 MPa, and is discharged through the air duct 4 at an accelerated rate.

[0067] In the third step, the flue gas treated in the second step passes through the buffer chamber 5 for catalytic oxidation treatment or is re-filtered through a filter assembly composed of multiple filter units in the buffer chamber 5. The flue gas treated in the buffer chamber 5 flows through the first treatment chamber 6 for water washing treatment and is filtered through the corrugated adsorption plate in the first treatment chamber 6.

[0068] In the fourth step, the flue gas treated in the first treatment chamber 6 is ionized and mixed in the second ionization treatment chamber 7 and then transported to the second treatment chamber 8;

[0069] The ionization voltage of the second ionization processing chamber 7 is lower than the ionization voltage of the first ionization processing chamber 2;

[0070] The ionization voltage of the first ionization treatment chamber 2 can achieve an ozone mixed concentration in the first ionization treatment chamber 2 of 45% of the total amount of flue gas entering the first ionization treatment chamber 2;

[0071] The ionization voltage of the second ionization treatment chamber 7 can achieve an ozone mixed concentration in the second ionization treatment chamber 7 of 20-30% of the total amount of flue gas entering the second ionization treatment chamber 7;

[0072] In the fifth step, the smoke in the fourth step is filtered through the second processing chamber 8, which adopts a vertical structure and a horizontal smoke inlet method;

[0073] In the sixth step, the flue gas treated in the second treatment chamber 8 is processed by the cyclone centrifuge 9. The dust and small particles in the flue gas are discharged from the bottom after centrifugal treatment. The flue gas is transported to the third treatment chamber 10 through the air supply channel of the cyclone centrifuge 9.

[0074] In the seventh step, the third processing chamber 10 adopts a vertical structure and uses a bottom air supply and upper air outlet structure to process the flue gas.

[0075] By adopting the method of the present invention to treat sintering flue gas, the carbon monoxide removal rate in the flue gas can reach 97%, and the sulfur oxide removal rate can reach 95%. By adopting the existing technology to treat sintering flue gas, the carbon monoxide removal rate in the flue gas can reach 75%, and the sulfur oxide removal rate can reach 85%.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0077] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A system for reducing carbon monoxide concentration in sintering flue gas, characterized by: The invention comprises an air intake pipe (1-1) connected to a smoke exhaust port, an adsorption chamber (1) being installed on the air intake pipe (1-1), the upper end of the adsorption chamber (1) being connected to an air outlet pipe (1-2), the air outlet pipe (1-2) being provided with a first ionization processing chamber (2), the outlet end of the first ionization processing chamber (2) being fixedly connected to a combustion chamber (3), an air guide pipe (4) being fixedly connected to an upper end of the combustion chamber (3), the upper end of the air guide pipe (4) being fixedly connected to a buffer chamber (5), the outlet end of the buffer chamber being connected to a combustion chamber (3) via a connecting pipe. The first processing chamber (6) is connected to the inlet end of the second processing chamber (8) through a connecting pipe provided with a second ionization processing chamber (7), the outlet end of the second processing chamber (8) is connected to the inlet end of the cyclone centrifuge (9) through a connecting pipe, the outlet end of the cyclone centrifuge (9) is connected to the inlet end of the third processing chamber (10) through a connecting pipe, the outlet end of the third processing chamber (10) is connected to the blower through a connecting pipe, and the blower is connected to an external exhaust pipe; The first processing chamber (6) is divided into three compartments, namely a first compartment (6-0), a second compartment (6-2) and a third compartment (6-3), wherein the first compartment is a water storage chamber, the second compartment is a spray chamber, and the third compartment is an adsorption processing chamber; the first compartment, the second compartment and the third compartment are connected, and a mesh layer (6-1) is provided in the first compartment, and an auxiliary component (6-4) is fixed at the center of the mesh layer (6-1) via a connecting rod; A pressurized injection pipe is fixedly provided in the first processing chamber (6), and the pressurized injection pipe is evenly distributed along the inner wall of the first processing chamber (6), and the pipe head of the pressurized injection pipe is located in the first processing chamber (6) below the liquid level in the first processing chamber (6); The pressurized injection pipe is externally connected to a pressurized pump, and the mesh layer (6-1) is located in the first processing chamber (6) at a position 10-15 centimeters higher than the air inlet; A spray plate (11) is provided in the second compartment (6-2), spray pipes are evenly distributed on the spray plate (11), and spray heads (12) are installed on the spray pipes; The spray pipe is evenly distributed around the circumference, and the spray heads (12) are densely arranged around the circumference at the center of the spray pipe. The spray plates (11) are located in the second compartment (6-2) and are provided in at least two layers. An upper adsorption plate (13) is fixedly provided at the upper end of the first processing chamber (6) at the outlet position. The upper adsorption plate (13) is provided with multiple layers. A ventilation channel (14) is provided on the upper adsorption plate (13). The ventilation channel (14) is wavy or corrugated. The ventilation channel (14) scatters from the center of the upper adsorption plate (13) to both sides. The upper adsorption plate (13) has a shape of a concave arc or a convex arc, and the two types are arranged alternately up and down; The concave arc shape of the upper adsorption plate (13) is concave downward from the center of the upper adsorption plate (13); The convex arc shape of the upper adsorption plate (13) protrudes upward from the center of the upper adsorption plate (13).

2. The system for reducing carbon monoxide concentration in sintering flue gas according to claim 1, characterized in that: A catalytic oxidation plate or a filter assembly consisting of a plurality of filter units is provided in the buffer bin (5), wherein the filter units include a dry filter unit (5-1), a UV photocatalytic oxidation unit (5-2), a honeycomb mesh catalyst unit (5-3), and a catalytic adsorption unit (5-4), wherein the dry filter unit, the UV photocatalytic oxidation unit, the honeycomb mesh catalyst unit, and the catalytic adsorption unit are sequentially connected and arranged in series. The dry filtration unit, UV photocatalytic oxidation unit, honeycomb mesh catalyst unit, and catalytic adsorption unit are independent box units; The dry filter unit is provided with three types of filters: primary efficiency, medium efficiency and high efficiency, wherein the primary efficiency, medium efficiency and high efficiency filters are respectively metal mesh filter, polyester breathable cloth filter and glass fiber filter; The UV photocatalytic oxidation unit is a vertical drawer structure, and multiple drawers are arranged at intervals, and mesh holes are opened on the drawer surface in the direction of the smoke flow, and all drawers are arranged in a connected manner; The honeycomb mesh catalyst unit is a vertical drawer structure, and multiple drawers are arranged at intervals. The drawer surface of each drawer in the direction of the smoke flow is provided with mesh holes, which are all interconnected, and the honeycomb mesh catalyst is embedded in the drawer in a block shape; The catalytic adsorption unit is a vertical drawer structure, and multiple units are arranged at intervals. Catalyst blocks are embedded in the catalytic adsorption unit. The drawer surface of each drawer in the direction of the flue gas flow is provided with mesh holes, which are all arranged in a connected manner. The catalyst block is a rectangular block with honeycomb holes made of rare metal, a rectangular block with honeycomb holes made of composite metal, or a rectangular block with honeycomb holes made of noble metal.

3. The system for reducing carbon monoxide concentration in sintering flue gas according to claim 1, characterized in that: The second processing chamber (8) is a hollow cavity structure. Springs (17) are fixed on the upper and lower inner walls of the second processing chamber. The springs are connected to the extrusion plates. The two extrusion plates are symmetrically arranged in the upper and lower parts. The extrusion plates are provided with plug-in slots (15). The plug-in slots are plugged into the adsorption plates (16). The adsorption plates (16) are composed of multi-layer honeycomb plates. The lower end of the second processing chamber (8) is connected to a hollow ash receiving trough by screwing. The position corresponding to the adsorption plate on the lower extrusion plate is hollowed out, and the hollow position is communicated with the ash receiving trough.

4. The system for reducing carbon monoxide concentration in sintering flue gas according to claim 1, characterized in that: The third processing chamber (10) is a hollow structure. A filter plate group (18) is provided in the third processing chamber (10). The filter plate group (18) is composed of a plurality of filter plates arranged in parallel. The plate surface of the filter plate (19) is arranged in a wavy or corrugated shape, and a hollow shape is formed between two opposite wavy or corrugated shapes, and an activated carbon layer is provided in the hollow cavity.

5. The system for reducing carbon monoxide concentration in sintering flue gas according to claim 1, characterized in that: The first ionization treatment chamber and the second ionization treatment chamber adopt the same structure. The first ionization treatment chamber and the second ionization treatment chamber are both arranged in sections. The pipes where the first ionization treatment chamber and the second ionization treatment chamber are located are square pipes. Several ionization wires are arranged in parallel in the first ionization treatment chamber and the second ionization treatment chamber along the direction of the flue gas, and the two ends of the ionization wires are fixed on the inner walls of the first ionization treatment chamber and the second ionization treatment chamber.

6. The system for reducing carbon monoxide concentration in sintering flue gas according to claim 3, characterized in that: The adsorption chamber (1) is a vertical pipe structure, and a plurality of the adsorption chambers (1) are arranged in parallel. A first spiral tube is provided on the inner wall of the adsorption chamber (1), and the first spiral tube is an open spiral tube. A second spiral tube is provided on the outer circumference of the adsorption chamber, and the second spiral tube is a cylindrical hollow spiral tube.

7. A method for use in the system for reducing carbon monoxide concentration in sintering flue gas according to any one of claims 1 to 6, characterized in that: The steps include: In the first step, the flue gas is pre-treated by passing through the adsorption chamber (1) to roughly filter the flue gas; In the second step, the smoke filtered in the first step is ionized in the first ionization treatment chamber (2). The first ionization treatment chamber (2) is segmented and has multiple chamber structures arranged in parallel and in communication with each other in the horizontal or vertical direction. The smoke is ionized in the ionization channel formed by the first ionization treatment chamber (2). The smoke is then burned at high temperature in the combustion chamber (3). The temperature is controlled at 90-120 degrees and the pressure is 6 MPa. The smoke is then discharged through the air duct (4). In the third step, the flue gas treated in the second step is subjected to catalytic oxidation treatment through the buffer chamber (5) or is re-filtered through a filter assembly composed of multiple filter units in the buffer chamber (5). The flue gas treated in the buffer chamber flows through the first treatment chamber (6) for water washing treatment and is filtered through the upper adsorption plate in the first treatment chamber. In the fourth step, the flue gas treated in the first treatment chamber (6) is ionized in the second ionization treatment chamber (7) and then transported to the The second processing chamber (8); The ionization voltage of the second ionization processing chamber (7) is lower than the ionization voltage of the first ionization processing chamber (2); In the fifth step, the smoke in the fourth step is filtered through the second processing chamber (8), and the second processing chamber (8) adopts a vertical structure and a horizontal smoke inlet method; In the sixth step, the flue gas processed by the second processing chamber (8) is processed by a cyclone centrifuge (9), and the dust and small particles in the flue gas are discharged from the bottom after centrifugal treatment. The flue gas is transported to the third processing chamber (10) through the air supply channel of the cyclone centrifuge (9); In the seventh step, the third processing chamber (10) adopts a vertical structure and uses a bottom air supply and upper air outlet structure to process the flue gas.

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