Sintering flue gas treatment equipment and method

Abstract

The present invention discloses a sintering flue gas treatment device and method, which belongs to the technical field of gas treatment. It includes a sintering machine, a first filter, a first processor, a second filter, a second processor, a catalytic reaction box, an adsorption bin and a desulfurization tower, and the desulfurization tower is connected to the chimney; the sintering machine is connected to the first filter through a smoke outlet pipe; the first filter is fixed with a primary filter plate rack, a medium-efficiency filter plate rack and a high-efficiency filter plate rack, and a support gap is left between the primary filter plate rack, the medium-efficiency filter plate rack and the high-efficiency filter plate rack, and a ventilated diamond plate rack is installed between the support gaps. Through the treatment of different flue gas sections, the desulfurization treatment of the sintering flue gas is achieved, and the NOx and SO2 pollutants in the sintering flue gas are removed, which can effectively improve the treatment results of the flue gas and reduce environmental pollution. The purpose of energy saving, emission reduction and pollution control is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas treatment, and in particular relates to a sintering flue gas treatment device and method. Background Art

[0002] Energy conservation and emission reduction are key aspects of the steel industry. Sintering machines produce significant flue gas emissions, with NOx emissions from the sintering process accounting for approximately 85% to 90% of the total NOx generated during the production process. Therefore, flue gas treatment is essential to reduce pollution and avoid significant impacts on the surrounding environment.

[0003] Due to the current sintering process and the relatively low sintering flue gas temperature, sintering flue gas can only meet sulfur dioxide emission targets. Current domestic sintering flue gas denitrification technologies use activated carbon or SCR denitrification. Both methods suffer from technical immaturity, unstable operation, low denitrification efficiency, and high energy consumption. The activated carbon method, a comprehensive desulfurization and denitrification technology, is suitable for flue gas purification from newly built sintering plants. Ozone oxidation denitrification is suitable for flue gas with low NOx concentrations. For flue gas with high NOx concentrations, ozone oxidation denitrification is difficult to achieve efficient denitrification and has high operating costs. The SCR denitrification process uses ammonia as a reducing agent and uses a catalyst to reduce NOx to N2 within a temperature range of 280-420°C. This mature denitrification technology offers high denitrification efficiency. To ensure effective denitrification and proper system operation, the sintering flue gas must be heated, which increases costs and fails to meet the energy conservation and emission reduction needs of existing steel mills. Summary of the Invention

[0004] The present invention provides a sintering flue gas treatment device and method, which can effectively improve the treatment result of the flue gas and reduce environmental pollution.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A sintering flue gas treatment equipment includes a sintering machine, a first filter, a first processor, a second filter, a second processor, a catalytic reaction box, an adsorption bin and a desulfurization tower. An air blocking duct is provided between the second processor and the catalytic reaction box. The sintering machine, the first filter, the first processor, the second filter, the second processor, the air blocking duct, the catalytic reaction box, the adsorption bin and the desulfurization tower are connected by a pipeline, and the desulfurization tower is connected to the chimney; the sintering machine is connected to the first filter through a smoke outlet pipe; a primary filter plate rack, a medium efficiency filter plate rack and a high efficiency filter plate rack are fixed in the first filter, and a support gap is left between the primary filter plate rack, the medium efficiency filter plate rack and the high efficiency filter plate rack, and a ventilated diamond plate rack is installed between the support gaps.

[0007] In the above-mentioned sintering flue gas treatment equipment, the first processor is cylindrical, an air inlet is provided at the bottom of the first processor, and a plurality of injection pipes are provided inside the first processor, and the injection pipes are provided near the air inlet and distributed in a circular shape; a baffle plate is fixedly provided on the inner wall of the first processor, and ventilation holes are evenly opened on the baffle plate, and the ventilation holes are conical holes, and the ventilation holes are distributed in a circular shape on the baffle plate.

[0008] In the above-mentioned sintering flue gas treatment equipment, the injection pipe is arranged obliquely along the inner wall of the first processor, the injection pipe is a flame injection pipe, and the injection pipe extends into the interior of the first processor, and the injection pipe is arranged at an angle along the first processor; the diameter of the bottom plane of the ventilation channel is half the diameter of the upper plane.

[0009] In the above-mentioned sintering flue gas treatment equipment, the gas outlet of the first processor is connected to the first processing chamber and the second processing chamber in sequence, several layers of primary filter plates are arranged at intervals in the first processing chamber, and the gas inlet of the second processing chamber is provided with an activated carbon filter; the second processor is a spray chamber, and a spray pipe is arranged at a position half the height of the second processor;

[0010] A plurality of waist drum-shaped ventilation pipes are arranged at intervals in the air blocking channel. The ventilation pipes are arranged longitudinally, and turbine blades are arranged in the middle of the ventilation pipes. The directions of the turbine blades in the adjacent ventilation pipes are opposite.

[0011] The sintering flue gas treatment equipment has a filter plate fixedly provided at the inlet position at the upper end of the catalytic reaction box, a catalyst fixing groove is provided below the filter plate, and a catalyst block is embedded in the catalyst fixing groove; the filter plate is a ventilation plate with a horizontal and vertical spacing;

[0012] The adsorption chamber is an electrostatic dust removal adsorption chamber, and the adsorption chamber is connected to symmetrical dovetail plates by screws. The dovetail plates are arranged at intervals, and filter plates are fixed at the smoke inlet and smoke outlet positions of the two dovetail plates. A discharge electrode is fixed in the middle of the two symmetrical dovetail plates.

[0013] The sintering flue gas treatment equipment is provided with a buffer bin between the second filter and the second processor. A plurality of buffer baffles are arranged at intervals in the buffer bin. The buffer baffles are wavy and have a plurality of through holes fixed thereon.

[0014] The top of the buffer bin is also connected to an activated carbon powder bin and a lime powder bin, the output ends of the activated carbon powder bin and the lime powder bin are both connected to the buffer bin, and the output ends of the activated carbon powder bin and the lime powder bin are both provided with a pressurized nozzle;

[0015] The above-mentioned sintering flue gas treatment equipment has a first quenching tower between the sintering machine and the first filter, and a second quenching tower between the first processor and the second filter; the buffer bin is connected to a bag dust collector through a pipeline.

[0016] The sintering flue gas treatment equipment described above has a sintering machine's flue gas outlet pipe divided into a first connecting pipe and a second connecting pipe. The first connecting pipe is connected to a return pipe, which is connected to a mixing chamber, which is connected to an air pipe. This can increase the sintering machine's inlet air temperature and save energy. The second filter is a high-efficiency filter with filter plates spaced apart.

[0017] The injection pipe is inclined at 30-45 degrees along the inner wall of the first processor;

[0018] The discharge electrodes adopt needle-shaped discharge, or adopt flat-laying detachable plate electrodes that are arranged at intervals.

[0019] A sintering flue gas treatment method comprises the following steps:

[0020] A. Primary cooling and filtration: One path of the flue gas generated by the sintering machine 1 flows along the first connecting pipe 1-1 into the mixing chamber 1-5, where it mixes with air and then enters the sintering machine 1. The other path of the flue gas flows through the second connecting pipe 1-2 and enters the first filter 2. The flue gas generated by the sintering machine 1 is divided into two paths, with the ratio of the two paths controlled at 1:1. The flue gas is filtered through the primary activated carbon filter material or the metal mesh-medium-efficiency high-temperature resistant polyester surface-high-efficiency ultrafine glass fiber filter medium in the first filter 2.

[0021] A first quenching tower 11 is provided between the sintering machine 1 and the first filter 2. The flue gas has a temperature of 145°C before entering the first quenching tower 11. After being processed in the first quenching tower 11, the flue gas is rapidly cooled to 100-110°C before entering the first filter 2.

[0022] B. Combustion treatment: The flue gas treated by the first filter 2 enters the first processor 3 and undergoes secondary flame combustion through the angled injection pipes provided in the first processor 3, thereby reducing the combustible content in the flue gas and forming a cyclone in the first processor 3 to be discharged upward;

[0023] C. Secondary cooling and filtration: The flue gas passing through the first processor 3 is rapidly cooled to 40-70°C in the second quenching tower, enters the second filter 4, and is processed by the high-efficiency filter before entering the buffer bin 13. In the buffer bin 13, the flue gas is sprayed with the activated carbon powder bin 14 and the lime powder bin 15 to mix with the flue gas to remove any residues.

[0024] The activated carbon powder bin 14 and the lime powder bin 15 are sprayed in the form of a spray. The activated carbon powder is sprayed 5 times per hour, with a spray amount of 1 kg each time and a spray time of 3-8 minutes. The lime powder is sprayed 4 times per hour, with a spray amount of 1.5 kg each time and a spray time of 5-7 minutes.

[0025] The buffer bin 13 is provided with buffer baffles 16 at intervals. The buffer baffles 16 slow down the flow rate of the flue gas and increase the contact and mixing time between the flue gas, activated carbon powder and lime powder, thereby improving the reaction effect.

[0026] D. Spray dust removal: The flue gas treated by the buffer bin 13 is processed by the second processor 5. The nozzles provided in the second processor 5 are symmetrically arranged on the upper and lower end surfaces of the spray pipe 5-1;

[0027] During use, according to the flue gas treatment concentration, downward spraying or simultaneous opposite spraying is used for spraying treatment to reduce SO2 and NOX in the flue gas.

[0028] E. Delaying the reaction: The flue gas in the air blocking channel further prolongs the above reaction time. The air blocking channel 6 prevents the flue gas from mixing unevenly with the spray liquid or the flue gas with the activated carbon powder or lime powder. If it is quickly discharged, it will not achieve the corresponding treatment effect. The flue gas in the air blocking channel 6 is connected to the catalytic reaction box through the connecting pipe;

[0029] F. Catalytic treatment: After passing through the air blocking channel and entering the catalytic reaction box 7, it undergoes a first-level filtration and reacts with the catalyst provided in the catalytic reaction box 7;

[0030] G. Adsorption, Desulfurization, and Emission: Flue gas treated in the catalytic reaction chamber 7 enters the adsorption chamber 8 directly. After electrostatic dust removal in the adsorption chamber 8, it enters the desulfurization tower 9. After desulfurization, it is discharged outdoors through the chimney 10. The electrostatic dust removal in the adsorption chamber 8 utilizes a high-voltage DC non-uniform electric field to ionize gas molecules in the flue gas, generating a large number of electrons and ions. As they move, they encounter dust particles in the flue gas, charging them. The charged dust particles are then electrostatically attracted to the plates or wires in the adsorption chamber 8, thereby purifying the flue gas.

[0031] Compared with the prior art, the beneficial effects of the present invention are: in order to facilitate the sufficient combustion treatment of the generated flue gas in the use state, the present invention adds a corresponding flame spray pipe, and the spray pipe extends to the inside of the first processor; the spray pipe is arranged at an angle along the inner wall of the first processor. Through the angled spray pipe, when the flue gas enters the first processor, the corresponding different spray angles promote the flue gas to form a swirling rotation in the first processing chamber, thereby increasing the corresponding combustion time.

[0032] An air blocking channel is provided in the present invention. In order to avoid uneven mixing of flue gas and spray liquid or flue gas and activated carbon powder and lime powder, which will not achieve the corresponding treatment effect after rapid discharge, the turbine blades in the ventilation pipes arranged at adjacent intervals are set in reverse. By setting the corresponding air blocking channel, the time for the moderate treatment can be delayed in the use state, thereby increasing the treatment effect of flue gas mixing.

[0033] The present invention realizes desulfurization of sintering flue gas and removes NOx and SO2 pollutants in sintering flue gas through segmented treatment and treatment of different flue gas sections, which has great social significance for achieving energy conservation, emission reduction and pollution control. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall process framework of the present invention;

[0035] Figure 2 This is a schematic diagram of the connection between the sintering machine and the mixing bin of the present invention;

[0036] Figure 3 This is a schematic diagram of the connection between the catalytic reaction box and the chimney of the present invention;

[0037] Figure 4 This is a schematic diagram of the connection of the present invention with a first quenching tower;

[0038] Figure 5 This is a schematic diagram of the connection of the present invention with a second quenching tower;

[0039] Figure 6 This is a schematic diagram of the connection of the present invention with a buffer bin;

[0040] Figure 7 This is a schematic diagram of the connection between the buffer bin and the bag dust collector of the present invention;

[0041] Figure 8 This is a three-dimensional schematic diagram of the buffer bin of the present invention;

[0042] Figure 9 This is a schematic plan view of the buffer bin of the present invention;

[0043] Figure 10 This is a three-dimensional schematic diagram of the diamond-shaped plate frame of the present invention;

[0044] Figure 11 This is a schematic plan view of the diamond-shaped plate frame of the present invention;

[0045] Figure 12 is a schematic plan view of the barrier plate of the present invention;

[0046] Figure 13 2 is a schematic cross-sectional view of a barrier plate of the present invention;

[0047] Figure 14It is a three-dimensional schematic diagram of the vent pipe of the present invention;

[0048] Figure 15 This is a schematic diagram of a swirl plate in a vent pipe according to the present invention;

[0049] Figure 16 is a schematic diagram of a second processor of the present invention;

[0050] Figure 17 is a cross-sectional schematic diagram of a second processor of the present invention;

[0051] Figure 18 This is a schematic diagram of the combined cross-section of the adsorption chamber of the present invention;

[0052] Figure 19 Schematic diagram of the filter plate of the present invention;

[0053] Figure 20 It is a schematic diagram of a single dovetail plate of the present invention;

[0054] Figure 21 It is a schematic diagram of the PVC board frame of the present invention;

[0055] Figure 22 It is a schematic cross-sectional view of the air blocking channel of the present invention.

[0056] Reference numerals in this document indicate: 1. Sintering machine, 1-1. First connecting pipe, 1-2. Second connecting pipe, 1-3. Return pipe, 1-4. Air pipe, 1-5. Mixing chamber, 2. First filter, 2-1. Diamond plate rack, 3. First processor, 3-1. Baffle plate, 3-4. Injection pipe, 3-5. Primary filter plate, 3-6. Activated carbon filter, 4. Second filter, 5. Second processor, 5-1. Spray pipe, 6. Air blocking duct, 6-1. Ventilation pipe, 7. Catalytic reaction box, 7-1. Filter plate, 7-2. Catalyst fixing tank, 8. Adsorption chamber, 8-1. Dovetail plate, 8-2. Filter plate, 8-3. Discharge electrode, 9. Desulfurization tower, 10. Chimney, 11. First quenching tower, 12. Second quenching tower, 13. Buffer bin, 14. Activated carbon powder bin, 15. Lime powder bin, 16. Baffle plate, 17. Bag dust collector. DETAILED DESCRIPTION

[0057] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. Example

[0058] like Figures 1 to 22As shown, the present invention includes a sintering machine 1, which is connected to a first filter 2 via a second connecting pipe 1-2, which is connected to a first processor 3 via a connecting pipe, which is connected to a second filter 4 via a connecting pipe, and a second processor 5 is connected to a pipe between the second filter 4 and an air blocking channel 6, which is connected to a catalytic reaction box 7 via a connecting pipe, which is connected to an adsorption bin 8, which is directly connected to a desulfurization tower 9, which is connected to a chimney 10;

[0059] The smoke exhaust duct of the sintering machine 1 is divided into a first connecting duct 1-1 and a second connecting duct 1-2. The first connecting duct 1-1 is connected to a return duct 1-3, which is connected to a mixing chamber 1-5. The mixing chamber 1-5 is connected to an air pipe 1-4, which can increase the intake temperature of the sintering machine and save energy. The sintering machine is divided into multiple smoke exhaust sections, and the smoke circulates to the second connecting duct 1-2 after each exhaust section, and circulates to the first connecting duct 1-1 after each exhaust section.

[0060] Preferably, the smoke outlet sections of the sintering machine are divided into 4-6 sections, which are an even number.

[0061] The above-mentioned sintering machine is divided into multiple smoke outlet sections. In the working state, when the sintering machine is burning, multiple smoke outlets are set. Taking four smoke outlets as an example, the smoke from the second connecting pipe 1-2 is connected to the second and fourth smoke outlets, and the smoke from the first connecting pipe 1-1 is connected to the first and third smoke outlets.

[0062] The first connecting pipe 1-1 is a flue gas return pipe. The flue gas from the first connecting pipe enters the mixing chamber 1-5 through the return pipe 1-3. The mixing chamber 1-5 plays a role of buffering and mixing. The air pipe 1-4 uses a delivery pump to deliver air or oxygen into the mixing chamber 1-5 for mixing. The mixing chamber 1-5 works intermittently.

[0063] The first filter 2 is fixed with a primary filter plate frame, a medium efficiency filter plate frame, and a high efficiency filter plate frame. There are gaps between the primary filter plate frame, the medium efficiency filter plate frame, and the high efficiency filter plate frame, and a ventilated diamond plate frame 2-1 is fixedly installed between the gaps. The second filter 4 is a high efficiency filter, and the filter plates of the high efficiency filter are arranged at intervals.

[0064] The filter medium of the primary filtration is an activated carbon filter material or a metal mesh.

[0065] The medium-efficiency filtration medium has a high-temperature resistant polyester surface;

[0066] The high efficiency filter medium is ultra-fine glass fiber;

[0067] In order to facilitate ventilation and reduce wind resistance, the diamond-shaped plate frame 2-1 adopts Figure 10 The structure is convenient for forming an air passage through the structure of the diamond-shaped plate frame 2-1 itself during use and installation, so that smoke can pass through and play the role of internal support.

[0068] like Figure 10 There are holes on the surface of the diamond plate frame. When the flue gas enters the diamond plate frame, it enters from any two surfaces of the diamond plate frame and then goes out from the other two surfaces of the diamond plate. Since the diamond plate is set at an angle, the flue gas enters the diamond plate at an angle when entering the diamond plate and then goes out from the other two surfaces. This way, diffusion is formed. The diamond plate frames are arranged in rows and fixed to the filter plate frame by rivets.

[0069] In order to facilitate secondary treatment of the flue gas generated by sintering during use and reduce flue gas emission pollution, the present invention is fixedly provided with an injection pipe 3-4 at the bottom of the first processor 3 along the circumferential surface of the first processor 3, and a baffle plate 3-1 is fixedly provided on the inner wall of the first processor 3. The baffle plate 3-1 is provided with a plurality of ventilation channels. The ventilation channels are conical channels and are evenly distributed in a circular shape on the baffle plate 3-1.

[0070] The baffle plate 3-1 is provided with several tapered ventilation channels. Preferably, the diameter of the bottom plane of the ventilation channel is half the diameter of the upper plane. This encourages smoke to flow from the smaller diameter end to the larger diameter end below the tapered channel. During operation, the tapered channel configuration ensures that the outlet end of the ventilation channel is larger than the inlet end. This mechanism facilitates smoke diffusion and ensures that high-concentration smoke can escape quickly from the first processor during use.

[0071] To facilitate sufficient combustion of generated flue gas during use, corresponding flame injection tubes are added. In a further preferred embodiment of the present invention, the injection tubes 3-4 are flame injection tubes, extending into the interior of the first processor 3. The injection tubes 3-4 are arranged at an angle of 30-45 degrees along the inner wall of the first processor 3. When the injection tubes are arranged at an angle of 30-45 degrees during use, the high-speed injection of the injection tubes ensures that the flue gas swirls upward within the first processor 3, extending the combustion time and residence time of the flue gas within the first processor 3. This promotes swirling of the flue gas within the first processor, thereby increasing the combustion time and combustion efficiency, and achieving the purpose of secondary combustion.

[0072] In order to facilitate the emission of polluted flue gas at the lowest possible level during use, the rear end of the first processor 3 is preferably connected to the first processing chamber and the second processing chamber, and the first processor 3 is arranged in communication with the first processing chamber and the second processing chamber; the first processing chamber is half the height of the first processor 3, and the first processing chamber is half the height of the first processor 3, ensuring that the swirling rising flue gas can enter the first processing chamber through the connection port during use and treat the exhaust flue gas. Its main purpose is to increase the flow area of ​​the flue gas. The first processing chamber is provided with a first-level filter plate 3-5, which is arranged at intervals. The first-level filter plates 3-5 are two groups of medium-efficiency filter plates arranged in parallel, and the filter medium is a high-temperature resistant polyester surface. Two filters are set in the first processor to block and absorb corresponding flue gas impurities and reduce their emission concentration. An activated carbon filter 3-6 is set in the second processing chamber and located at the connection port between the first processing chamber and the second processing chamber.

[0073] To facilitate cooling of the outlet flue gas during use and prevent corrosion of the equipment by high-concentration flue gas, a further preferred technical solution of the present invention is that a first quenching tower 11 is fixedly disposed between the sintering machine 1 and the first filter 2, and a second quenching tower 12 is fixedly disposed between the first processor 3 and the second filter 4. An induced draft fan is disposed between the second filter 4 and the second quenching tower 12 to increase the speed at which flue gas passes through the first and second filters. This also avoids the disadvantage of a fan located after the second filter, which would accelerate the flue gas entering the second processor.

[0074] The first quenching tower and the second quenching tower adopt the existing technology and are cylindrical quenching tower structures. A plurality of water mist nozzles are arranged in the temple for cooling treatment.

[0075] To facilitate gas mixing and processing within the pipeline during operation, in a further preferred embodiment of the present invention, the second processor 5 is a spray chamber. This second processor 5 is hollow, and spray pipes 5-1 are fixedly positioned at half the height of the second processor 5. Several nozzles are fixedly mounted on these spray pipes 5-1, communicating with them. Adjacent nozzles are symmetrically positioned. This ensures that the spray area covers the entire spray chamber. During operation, spraying can be performed using either downward spraying or simultaneous opposite spraying, depending on the actual flue gas concentration, to conserve spray fluid.

[0076] When the spray chamber is working, the flue gas can be sprayed in different ways such as countercurrent and / or cocurrent. The spray liquid is ammonia liquid or other mixed liquid that is compatible with the flue gas. The ammonia liquid is sprayed through the spray chamber to treat the flue gas flowing through the second processor 5. When the ammonia liquid is sprayed, it contacts the high-temperature flue gas in the second processor 5 in a countercurrent and / or cocurrent state in an atomized state. The heat of the flue gas vaporizes all the water in the ammonia solution, and the reducing effect of the ammonia solution selectively reacts with SO2 and NOX to reduce the emissions of SO2 and NOX.

[0077] To facilitate the removal of flue gas during use, a further preferred embodiment of the present invention is that a buffer bin 13 is fixedly provided between the second filter 4 and the mixing bin 6. The upper end of the buffer bin 13 is connected to an activated carbon powder bin 14 and a lime powder bin 15 via connecting pipes. A pressurized nozzle is fixedly installed on the connecting pipes between the activated carbon powder bin 14, the lime powder bin 15 and the buffer bin 13. The buffer bin 13 is arranged on the pipe before the second processor 5 and is in communication with the second processor 5. When the activated carbon powder and lime powder in the activated carbon powder bin 14 and the lime powder bin 15 pass through the buffer bin 13, the use of the pressurized nozzle results in a high flow rate, which facilitates diffusion and mixing within the buffer bin 13, adsorbing the flue gas and removing odor from the flue gas.

[0078] Buffer baffles 16 are arranged at intervals in the buffer bin 13. The buffer baffles 16 are wavy, and a plurality of through holes are fixed on the buffer baffles 16. The buffer baffles 16 are arranged at intervals. The curvature radius of the wavy buffer baffles 16 adopts different sizes. The through holes on the buffer baffles 16 are arranged in segments. The through holes are arranged at the wave gap or the trough of the wavy buffer baffle, or are arranged at the wave wind or the trough at the same time. The through holes are circular holes or elliptical holes. The main function of the arrangement is to increase the mixing time of the activated carbon powder, lime powder and flue gas. At the same time, by arranging the wavy buffer baffles, a short-term airflow collision can be formed between the baffles to accelerate the mixing of the activated carbon powder, lime powder and flue gas.

[0079] A flue gas cyclone is fixedly connected to the outlet of the buffer bin. The cyclone can spin out large particles of condensate through the centrifugal action of the cyclone, allowing the flue gas to enter the next treatment stage through the cyclone.

[0080] The buffer bin 13 is connected to a bag filter 17 via a connecting pipe. At the same time, the particulate matter and dust in the flue gas are filtered and intercepted to prevent the smoke and dust from overflowing.

[0081] In order to avoid uneven mixing of flue gas and spray liquid or flue gas and activated carbon powder and lime powder, which will not achieve the corresponding treatment effect after rapid discharge, the second processor 5 branch is connected to the air blocking channel 6 arranged in parallel to prolong the contact reaction time between flue gas and spray liquid or flue gas and activated carbon powder and lime powder. Specifically, the air blocking channel 6 is a hollow tubular structure, and a waist drum-shaped ventilation pipe 6-1 is arranged at intervals in the air blocking channel 6. A swirl plate is provided at the center of the ventilation pipe 6-1, and the swirl plates in the adjacently spaced ventilation pipes 6-1 are arranged in reverse. The swirl plates in the ventilation pipe 6-1 are arranged in reverse, and multiple ventilation pipes 6-1 are arranged adjacent to each other up and down, and the swirl plates operate alternately in forward and reverse directions.

[0082] In the second processor 5, during spraying, the ammonia liquid is atomized and contacted with the high-temperature flue gas in the second processor 5 in countercurrent and / or cocurrent flow, and then enters the vent pipe 6-1. Before entering the vent pipe 6-1, the flue gas passing through the second processor 5 is atomized and combined with the high-temperature flue gas. This results in that during the combination process in the second processor 5, some incompletely combined flue gas will enter the vent pipe 6-1 along the connecting pipe, and the flue gas will carry the mixed mist of incompletely combined atomized ammonia liquid and high-temperature flue gas (escaped flue gas) along the connecting pipe. At this time, the swirl plate set in the opposite direction in the vent pipe 6-1 can change the direction of the flue gas and prevent the flue gas from escaping the vent pipe 6-1 quickly. The reverse setting of the swirl plate can increase the time the flue gas stays in the vent pipe 6-1 to a certain extent, and at the same time increase the mixing uniformity of the ammonia liquid atomized and combined with the high-temperature flue gas.

[0083] In order to facilitate the effective catalytic adsorption of flue gas in use, a further preferred embodiment of the present invention is that the upper end of the catalytic reaction box 7 is fixedly provided with a filter plate 7-1 at the inlet position, and catalyst fixing grooves 7-2 are provided below the filter plate at intervals, and catalyst blocks are embedded in the catalyst fixing grooves 7-2; the filter plate 7-1 is a vent plate arranged at intervals horizontally and vertically; Figure 1 As can be seen, the catalytic reaction box 7 is equipped with a first-stage filter plate and two-stage catalyst fixing grooves, in which catalyst blocks are embedded. By providing the catalyst fixing grooves and embedding the catalyst blocks in the catalyst fixing grooves, NOx in the flue gas is adsorbed, further treating the concentration of NOx carried in the flue gas.

[0084] The filter plates 7-1 are arranged at intervals in the horizontal and vertical directions to ensure that the flue gas enters the catalytic reaction box when in use, prolonging the residence time of the flue gas and improving the reaction efficiency between the catalyst block and the flue gas.

[0085] In order to facilitate the removal of impurities through the corresponding electric field effect during use, a further preferred embodiment of the present invention is that the adsorption bin 8 is an electrostatic dust removal adsorption bin, and the adsorption bin 8 is connected to symmetrical dovetail plates 8-1 by screwing, the dovetail plates 8-1 are arranged at intervals, and filter plates 8-2 are fixed at the smoke inlet and smoke outlet positions of the two dovetail plates 8-1, and a discharge electrode 8-3 is fixed at the middle position of the two symmetrical dovetail plates 8-1; the discharge electrode 8-3 adopts needle discharge or a flat-laid, detachable and spaced plate electrode.

[0086] The present invention utilizes various discharge electrodes, which can fully absorb impurities from flue gas while not increasing the generation of heavy metals during the discharge process. The present invention employs flat, removable, and spaced-apart plate electrodes. This electrode structure utilizes a PVC plate with holes. A cardboard shell is laid on the surface of the PVC plate, and a graphite conductive layer is applied to the surface of the cardboard shell. The graphite conductive layer can be symmetrical rectangular strips. The PVC plate structure is multi-layered, increasing the adsorption area and shortening the processing time. When using a corrugated cardboard structure, the graphite conductive layers can be spaced apart on opposing edges of the cardboard.

[0087] The rough paper shell is a paper shell board or corrugated paper board with a certain thickness. When in use, the overall forming thickness of the paper shell board or corrugated paper board is controlled to be 10-15 mm.

[0088] A sintering flue gas circulation method comprises the following steps:

[0089] A. Primary cooling and filtration: One path of the flue gas generated by the sintering machine 1 flows along the first connecting pipe 1-1 into the mixing chamber 1-5, where it mixes with air and then enters the sintering machine 1. The other path of the flue gas flows through the second connecting pipe 1-2 and enters the first filter 2. The flue gas generated by the sintering machine 1 is divided into two paths, with the ratio of the two paths controlled at 1:1. The flue gas is filtered through the primary activated carbon filter material or the metal mesh-medium-efficiency high-temperature resistant polyester surface-high-efficiency ultrafine glass fiber filter medium in the first filter 2.

[0090] A first quenching tower 11 is provided between the sintering machine 1 and the first filter 2. The flue gas has a temperature of 145°C before entering the first quenching tower 11. After being processed in the first quenching tower 11, the flue gas is rapidly cooled to 100-110°C before entering the first filter 2.

[0091] B. Combustion treatment: The flue gas treated by the first filter 2 enters the first processor 3 and undergoes secondary flame combustion through the angled injection pipes provided in the first processor 3, thereby reducing the combustible content in the flue gas and forming a cyclone in the first processor 3 to be discharged upward;

[0092] C. Secondary cooling and filtration: The flue gas passing through the first processor 3 is rapidly cooled to 40-70°C in the second quenching tower, enters the second filter 4, and is processed by the high-efficiency filter before entering the buffer bin 13. In the buffer bin 13, the flue gas is sprayed with the activated carbon powder bin 14 and the lime powder bin 15 and mixed with the flue gas to treat the residue in the flue gas;

[0093] The activated carbon powder bin 14 and the lime powder bin 15 are sprayed in the form of a spray. The activated carbon powder is sprayed 5 times per hour, with a spray amount of 1 kg each time and a spray time of 3-8 minutes. The lime powder is sprayed 4 times per hour, with a spray amount of 1.5 kg each time and a spray time of 5-7 minutes.

[0094] The buffer bin 13 is provided with buffer baffles 16 at intervals. The buffer baffles 16 slow down the flow rate of the flue gas and increase the contact and mixing time between the flue gas, activated carbon powder and lime powder, thereby improving the reaction effect.

[0095] D. Spray dust removal: The flue gas treated by the buffer bin 13 is processed by the second processor 5. The nozzles provided in the second processor 5 are symmetrically arranged on the upper and lower end surfaces of the spray pipe 5-1;

[0096] During use, according to the flue gas treatment concentration, downward spraying or simultaneous opposite spraying is used for spraying treatment to reduce SO2 and NOX in the flue gas.

[0097] E. Delaying the reaction: The flue gas in the air blocking channel further prolongs the above reaction time. The air blocking channel 6 prevents the flue gas from mixing unevenly with the spray liquid or the flue gas with the activated carbon powder or lime powder. If it is quickly discharged, it will not achieve the corresponding treatment effect. The flue gas in the air blocking channel 6 is connected to the catalytic reaction box through the connecting pipe;

[0098] F. Catalytic treatment: After passing through the air blocking channel and entering the catalytic reaction box 7, it undergoes a first-level filtration and reacts with the catalyst provided in the catalytic reaction box 7;

[0099] G. Adsorption, Desulfurization, and Emission: Flue gas treated in the catalytic reaction chamber 7 enters the adsorption chamber 8 directly. After electrostatic dust removal in the adsorption chamber 8, it enters the desulfurization tower 9. After desulfurization, it is discharged outdoors through the chimney 10. The electrostatic dust removal in the adsorption chamber 8 utilizes a high-voltage DC non-uniform electric field to ionize gas molecules in the flue gas, generating a large number of electrons and ions. As they move, they encounter dust particles in the flue gas, charging them. The charged dust particles are then electrostatically attracted to the plates or wires in the adsorption chamber 8, thereby purifying the flue gas. Example

[0100] The difference between this embodiment and the first embodiment is that the injection nozzles for spraying ammonia liquid are arranged at intervals in the injection pipes 3-4, and magnetized ammonia liquid is sprayed. The magnetized ammonia liquid increases the saturation and the degree of mixing of the ammonia liquid and the flue gas, while reducing the amount of ammonia liquid used.

[0101] By setting the nozzles at an angle, the nozzles 3-4 are tilted at 30-45 degrees along the inner wall of the first processor 3, depending on the corresponding injection angles, when the flue gas enters the first processor. In use, the nozzles are set at an angle, and when spraying at high speed, they spray in the same direction within the nozzles. This creates a high-speed jet flow within the first processor, driving the flue gas in the nozzles into a spiral upward state, increasing the mixing uniformity of the ammonia liquid and the flue gas and improving reaction efficiency.

[0102] The wet desulfurization + ozone oxidation denitrification technology was compared with the sintering flue gas treatment method provided by the present invention, and an economic and technical analysis was conducted. The results are shown in Table 1.

[0103] Table 1 Comparison of wet desulfurization + ozone oxidation denitrification technology and the sintering flue gas treatment method of the present invention

[0104] Project indicators Combination of dry / wet desulfurization and ozone technology Flue gas sintering treatment method of the present invention NOX content in flue gas ≥60mg / Nm3 ≤450mg / Nm3 Flue gas denitrification efficiency ＜75% ≥85% Is NO2 formed in the flue gas? yes no Energy consumption high Low Flue gas moisture content ≥20% ≤15% Flue gas desulfurization efficiency ＜85% ≥90% Whether there is white smoke have none

[0105] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sintering flue gas treatment equipment, characterized in that: The invention comprises a sintering machine (1), a first filter (2), a first processor (3), a second filter (4), a second processor (5), a catalytic reaction box (7), an adsorption chamber (8) and a desulfurization tower (9); an air blocking passage (6) is provided between the second processor (5) and the catalytic reaction box (7); the sintering machine (1), the first filter (2), the first processor (3), the second filter (4), the second processor (5), the air blocking passage (6), the catalytic reaction box (7), the adsorption chamber (8) and the desulfurization tower (9) are connected through a pipeline; the desulfurization tower (9) is connected to a chimney (10); the sintering machine (1) is connected to the first filter (2) through a smoke outlet pipe; a primary filter plate frame, a medium-efficiency filter plate frame and a high-efficiency filter plate frame are fixedly provided in the first filter (2); the primary filter plate frame, the medium-efficiency filter plate frame and the high-efficiency filter plate frame are fixedly provided in the first filter (2); A support gap is left between the filter plate frame and the high-efficiency filter plate frame, and a ventilated diamond plate frame (2-1) is installed between the support gaps; the air outlet end of the first processor (3) is connected to the first processing chamber and the second processing chamber in sequence, a plurality of layers of primary filter plates (3-5) are arranged at intervals in the first processing chamber, and an activated carbon filter (3-6) is provided at the air inlet end of the second processing chamber; the second processor (5) is a spray chamber, and a spray pipe (5-1) is arranged at intervals at a position half the height of the second processor (5); a plurality of waist drum-shaped ventilation pipes (6-1) are arranged at intervals in the air blocking channel (6), the ventilation pipes (6-1) are arranged longitudinally, and a turbine blade is provided in the middle of the ventilation pipe (6-1); the turbine blades in the ventilation pipes (6-1) arranged at adjacent intervals have opposite directions.

2. The sintering flue gas treatment equipment according to claim 1, characterized in that: The first processor (3) is cylindrical, an air inlet is provided at the bottom of the first processor (3), a plurality of injection pipes (3-4) are provided in the first processor (3), and the injection pipes (3-4) are provided near the air inlet and are distributed in a circumferential shape; a baffle plate (3-1) is fixedly provided on the inner wall of the first processor (3), and ventilation channels are evenly provided on the baffle plate (3-1), the ventilation channels are tapered channels, and the ventilation channels are distributed in a circumferential shape on the baffle plate (3-1).

3. The sintering flue gas treatment equipment according to claim 2, characterized in that: The injection pipe (3-4) is arranged obliquely along the inner wall of the first processor (3), the injection pipe (3-4) is a flame injection pipe, and the injection pipe (3-4) extends into the interior of the first processor (3), and the injection pipe (3-4) is arranged at an angle along the first processor (3); the diameter of the bottom plane of the ventilation channel is half the diameter of the upper plane.

4. The sintering flue gas treatment equipment according to claim 3, characterized in that: A filter plate (7-1) is fixedly provided at the inlet position on the upper end of the catalytic reaction box (7), a catalyst fixing groove (7-2) is provided below the filter plate (7-1), and a catalyst block is embedded in the catalyst fixing groove (7-2); the filter plate (7-1) is a ventilation plate arranged at intervals in the horizontal and vertical directions; The adsorption bin (8) is an electrostatic dust removal adsorption bin, and symmetrical dovetail plates (8-1) are connected to the adsorption bin (8) by screwing. The dovetail plates (8-1) are arranged at intervals, and filter plates (8-2) are fixedly provided at the smoke inlet and smoke outlet positions of the two dovetail plates (8-1), and a discharge electrode (8-3) is fixedly provided at the middle position of the two symmetrical dovetail plates (8-1).

5. The sintering flue gas treatment equipment according to claim 4, characterized in that: A buffer bin (13) is further provided between the second filter (4) and the second processor (5), wherein a plurality of buffer baffles (16) are arranged at intervals in the buffer bin (13), wherein the buffer baffles (16) are wavy in shape, and a plurality of through holes are fixedly opened on the buffer baffles (16); The top of the buffer bin (13) is also connected to an activated carbon powder bin (14) and a lime powder bin (15), and the output ends of the activated carbon powder bin (14) and the lime powder bin (15) are both communicated with the buffer bin (13), and the output ends of the activated carbon powder bin (14) and the lime powder bin (15) are both provided with pressurized nozzles.

6. The sintering flue gas treatment equipment according to claim 5, characterized in that: A first quenching tower (11) is provided between the sintering machine (1) and the first filter (2), and a second quenching tower (12) is provided between the first processor (3) and the second filter (4); and a bag dust collector (17) is connected to the buffer bin (13) via a pipeline.

7. The sintering flue gas treatment equipment according to claim 6, characterized in that: One of the smoke outlets of the sintering machine (1) is connected to a return pipe (1-3) via a first connecting pipe (1-1), the return pipe (1-3) is connected to a mixing chamber (1-5), and the mixing chamber (1-5) is connected to an air pipe (1-4). The other smoke outlet passes through a second connecting pipe (1-2) and enters a first filter (2); the second filter (4) is a high-efficiency filter, and the filter plates of the high-efficiency filter are arranged at intervals. The injection pipe (3-4) is inclined at 30-45 degrees along the inner wall of the first processor (3); The discharge electrode (8-3) adopts needle-shaped discharge, or adopts flat-laying detachable plate electrodes that are arranged at intervals.

8. The sintering flue gas treatment method using the sintering flue gas treatment equipment according to claim 7 is characterized in that: Follow these steps: A. One-step cooling and filtering: one path of the flue gas generated by the sintering machine (1) enters the mixing chamber (1-5) along the first connecting pipe (1-1) to mix with the air and then enters the sintering machine (1), and the other path enters the first filter (2) through the second connecting pipe (1-2); the flue gas generated by the sintering machine (1) is divided into two paths, and the ratio of the two paths is controlled to be 1:1; the flue gas is filtered through the primary activated carbon filter material or the metal mesh-medium-efficiency high-temperature resistant polyester surface-high-efficiency ultra-fine glass fiber filter medium in the first filter (2); A first quenching tower (11) is provided between the sintering machine (1) and the first filter (2). The flue gas has a temperature of 145° C. before entering the first quenching tower (11). After being processed in the first quenching tower (11), the flue gas is rapidly cooled to 100° C. before entering the first filter (2). B. Combustion treatment: The flue gas processed by the first filter (2) enters the first processor (3), and undergoes secondary flame combustion through an angled injection pipe provided in the first processor (3), thereby reducing the combustible content in the flue gas and forming a cyclone in the first processor (3) for upward discharge; C. Secondary cooling and filtration: The flue gas passing through the first processor (3) is rapidly cooled to 45°C in the second quenching tower, enters the second filter (4), is processed by the high-efficiency filter and enters the buffer bin (13); in the buffer bin (13), the flue gas is sprayed with the activated carbon powder bin (14) and the lime powder bin (15) to mix with the flue gas to treat the residue in the flue gas; The activated carbon powder bin (14) and the lime powder bin (15) adopt a spraying form, wherein the activated carbon powder is sprayed 5 times per hour, the amount of each spray is 1 kg, and the time of each spray is controlled to be 8 minutes; the lime powder is sprayed 4 times per hour, the amount of each spray is 1.5 kg, and the time of each spray is controlled to be 5 minutes; Buffer baffles (16) are arranged at intervals in the buffer bin (13), and the buffer baffles (16) are arranged to slow down the flow speed of the flue gas, while increasing the contact and mixing time between the flue gas, the activated carbon powder and the lime powder, thereby improving the reaction effect; D. Spray dust removal: the flue gas processed by the buffer bin (13) is processed by the second processor (5), and the nozzles provided in the second processor (5) are symmetrically arranged on the upper and lower end surfaces of the spray pipe (5-1); In use, according to the flue gas treatment concentration, spray treatment is carried out by downward spraying or simultaneous opposite spraying to reduce SO2 and NOX in the flue gas; E. Delayed reaction: The smoke further prolongs the above reaction time in the air blocking duct; F. Catalytic treatment: the gas enters the catalytic reaction box (7) through the air blocking passage and undergoes a first-stage filtration before reacting with the catalyst provided in the catalytic reaction box (7); G. Adsorption and desulfurization: The flue gas treated by the catalytic reaction box (7) directly enters the adsorption chamber (8), and enters the desulfurization tower (9) after being adsorbed by the electrostatic dust removal in the adsorption chamber (8). After desulfurization treatment, it is discharged to the outside through the chimney (10). The electrostatic dust removal in the adsorption chamber (8) uses a high-voltage DC non-uniform electric field to ionize the gas molecules in the flue gas, generating a large number of electrons and ions. During the movement, the dust particles in the flue gas are charged. The charged dust is adsorbed on the electrode plate or electrode line by the electrostatic force of the adsorption chamber (8), thereby purifying the flue gas.

9. The sintering flue gas treatment method according to claim 8, characterized in that: Follow these steps: In step A, the flue gas generated by the sintering machine (1) is divided into two paths, and the ratio of the two paths of flue gas is controlled to be 1:1; In step D, spraying treatment is performed by downward spraying or simultaneous opposite spraying according to the actual flue gas concentration state.

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