Flue gas desulfurization and denitrification integrated device for blast furnace hot blast stove
By combining heat exchangers and semi-fixed bed adsorption towers with sprayed reducing agents, the problems of difficult solid waste treatment and large land occupation in blast furnace hot blast stove flue gas desulfurization and denitrification devices have been solved, achieving integrated desulfurization and denitrification, reducing investment and land occupation requirements, and reducing costs through activated carbon recycling.
Patent Information
- Application Number
- CN202422968761.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing blast furnace hot blast stove flue gas desulfurization and denitrification devices have problems such as difficult solid waste treatment, large land area and large investment, and require the addition of SCR denitrification devices.
A combined device consisting of a heat exchanger, a semi-fixed bed adsorption tower, and an activated carbon desorption tower is used. Desulfurization and denitrification are achieved by injecting a reducing agent into the semi-fixed bed adsorption tower. Combined with an intermittent bed operation control system, desulfurization and denitrification are integrated, avoiding the need for additional equipment.
Desulfurization and denitrification are completed in one unit, avoiding the generation of solid waste, reducing investment and land requirements, achieving efficient and environmentally compliant flue gas emissions, and reducing costs through the recycling of activated carbon.
Smart Images
Figure CN223505084U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of flue gas treatment technology, and in particular relates to an integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas. Background Technology
[0002] The fuel gas used in hot blast stoves of ironmaking blast furnaces generally comes from the three main types of coal gas produced in the steel industry: blast furnace gas, coke oven gas, and converter gas. Therefore, the main source of SO2 in the flue gas is the total sulfur in the fuel gas used, primarily hydrogen sulfide and carbonyl sulfide. The main source of NOx in the flue gas is thermal NO; the higher the combustion temperature, the higher the NO concentration. Studies show that of the NOx formed during combustion, NO accounts for 95%, and NO2 accounts for about 5%. The characteristics of the flue gas from hot blast stoves of ironmaking blast furnaces are as follows:
[0003] (1) The temperature of the flue gas emitted by the hot air furnace fluctuates greatly, generally between 150 and 200°C;
[0004] (2) Hot blast stoves generally use blast furnace gas as fuel, and the levels of sulfur dioxide and nitrogen oxides in the flue gas are relatively low;
[0005] (3) When the hot blast stove switches working conditions, the flue gas volume, flue gas temperature and flue gas pressure change greatly.
[0006] The existing desulfurization and denitrification devices for blast furnace hot blast stove flue gas and their shortcomings are as follows:
[0007] (1) Dry desulfurization + SCR denitrification: High-activity calcium hydroxide (or ground sodium bicarbonate) powder is used as the desulfurizing agent. It is sprayed into the desulfurization device to absorb sulfur dioxide in the flue gas through chemical reaction. The flue gas after desulfurization carries high concentration of dust. After entering the dust collector and being filtered, it is discharged after passing through SCR denitrification. Solid waste calcium sulfate, calcium sulfite (sodium sulfate is generated as hazardous waste by the sodium bicarbonate method), and sodium sulfite are generated, which are difficult to treat. The newly added SCR denitrification and bag dust collection occupy a large area and require a large investment.
[0008] (2) Calcium-based fixed-bed desulfurization + SCR denitrification: Calcium-based desulfurizing agent granules are packed in the desulfurization reactor. Flue gas passes through the desulfurizing agent bed, where sulfur dioxide is oxidized to sulfur trioxide under the catalytic action of the calcium-based desulfurizing agent, and reacts with the calcium-based desulfurizing agent to generate calcium sulfate, which is solidified in the desulfurizing agent. The flue gas after desulfurization is discharged after SCR denitrification, generating solid waste calcium sulfate that is difficult to treat; the newly added SCR denitrification requires a large area and a large investment.
[0009] (3) Wet desulfurization + SCR denitrification: Alkaline slurry or solution is used as the absorbent. Flue gas is sprayed and washed in the absorption tower. Sulfur dioxide reacts with the absorbent to generate sulfite and sulfate. After the flue gas is heated, it is discharged after SCR denitrification. The exhaust temperature is low, which corrodes the flue and equipment; solid waste sulfate and wastewater are generated and difficult to treat; the newly added SCR denitrification occupies a large area.
[0010] (4) Semi-dry desulfurization + SCR denitrification: Quicklime is used as the absorbent, and a circulating fluidized bed is used as the desulfurization reactor to desulfurize the flue gas, generating calcium sulfite and calcium sulfate. A bag filter is installed at the end to collect the desulfurization ash. The flue gas is finally discharged after SCR denitrification. The exhaust gas temperature is low, which corrodes the flue and equipment; solid waste sulfate and sulfite are generated, which need to be treated separately; the newly added SCR denitrification and bag filter occupy a large area and require a large investment. Utility Model Content
[0011] The purpose of this invention is to provide an integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas, which solves the problems of difficult treatment of solid waste after desulfurization and the need for new devices for denitrification, which require a large area and high investment.
[0012] To achieve the above objectives, the present invention adopts the following technical solution:
[0013] An integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas includes a heat exchanger, a semi-fixed bed adsorption tower, a reducing agent storage device, and an activated carbon desorption tower. The outlet of the heat exchanger is connected to a booster fan, and a cooling air valve is connected between the heat exchanger and the booster fan. The outlet of the booster fan is connected to the inlet flue of the semi-fixed bed adsorption tower. An outlet flue is provided on the side wall of the semi-fixed bed adsorption tower, and the outlet flue and the inlet flue are on different sides of the semi-fixed bed adsorption tower. The outlet flue is connected to a chimney. The reducing agent storage device is connected to a spray structure, and the spray structure is inserted into the inlet flue wall of the semi-fixed bed adsorption tower through a pipe. The semi-fixed bed adsorption tower is connected to a bed intermittent operation control system. The bottom outlet pipe of the semi-fixed bed adsorption tower is connected to a discharge chain, and the discharge chain is connected to a discharge hopper. A feeding port is opened at the top of the semi-fixed bed adsorption tower, and the feeding port is connected to a feeding chain, which is connected to a feeding hopper.
[0014] Preferably, the semi-fixed bed adsorption tower further includes a silo, which is connected below the feed inlet. Multiple distribution chutes are provided at the bottom of the silo, each containing a rotary distributor (a swirl vane). The bottom of each distribution chute is connected to the tower body, which contains an activated carbon bed. The side wall of the tower body's outlet flue has an outlet air box side mesh plate, and an outlet air box is located outside the outlet flue side wall. The side wall of the tower body's inlet flue has an inlet air box side mesh plate, and an inlet air box is located outside the inlet flue side wall. A roller discharge structure is connected to the bottom of the tower body, which is connected to a discharge chute. The outlet pipe of the discharge chute is connected to a discharge chain.
[0015] Preferably, the lower part of the hopper is cone-shaped, and a strip-shaped buffer plate is provided inside the lower part of the hopper.
[0016] Preferably, the feeding chute is provided with a buffer structure.
[0017] Preferably, the activated carbon bed is connected to a temperature measuring device, the inlet and outlet air boxes are both connected to a pressure measuring device, the outlet flue is connected to a CEMS pollutant emission online monitoring device, and the temperature measuring device, pressure measuring device, and CEMS pollutant emission online monitoring device are all connected to the bed intermittent operation control system.
[0018] Preferably, the activated carbon desorption tower includes a tower body, with a feed inlet at the top and a roller feeder at the bottom. The discharge port at the bottom of the roller feeder is connected to a three-way valve, and the other two ends of the three-way valve are respectively connected to a distribution pipe and a discharge chain. A buffer plate is installed inside the distribution pipe, and a transfer belt is installed at the outlet of the distribution pipe. A packaging structure is installed below the end of the transfer belt.
[0019] Preferably, the packaging structure includes a buffer chamber, the lower part of which is funnel-shaped, and a buffer strip is provided inside the lower part of the buffer chamber. A V-shaped rotary valve is connected below the buffer chamber, and a packaging machine is connected below the V-shaped rotary valve. The packaging machine is connected to a transfer structure.
[0020] Preferably, a debris filter screen is connected above the feeding hopper. The debris filter screen is a stainless steel grid structure. A support unpacking structure is connected above the debris filter screen. The lower part of the feeding hopper is funnel-shaped. A screw feeder is installed inside the lower part of the feeding hopper. A weighing level gauge is installed on the lower outer wall of the feeding hopper. A slide valve is connected below the feeding hopper. The slide valve is connected to a chute through a flange. A layered buffer plate is installed inside the chute. The feeding chain abuts against the bottom of the chute.
[0021] Preferably, a lifting structure is provided above the supporting unpacking structure, the lifting structure includes a fixed beam, and a lifting electric hoist is fixed below the fixed beam.
[0022] Working principle: The flue gas from the blast furnace hot blast stove is cooled to about 135℃ through a heat exchanger before entering the booster fan. If the temperature is too high, the cold air mixing valve is opened to ensure that the flue gas temperature does not exceed 140℃ before entering the booster fan. The cooled flue gas then enters the semi-fixed bed adsorption tower. The spray structure on the inlet flue wall of the semi-fixed bed adsorption tower sprays the reducing agent from the reducing agent storage device into the semi-fixed bed adsorption tower. The reducing agent is used for denitrification in the semi-fixed bed adsorption tower to remove pollutants such as SO2, NOx, HF, dust, heavy metals, and dioxins. The system operation status is monitored in real time through the intermittent operation control system of the bed, realizing the automation of the intermittent flow of the activated carbon bed in the adsorption tower, and completing the integrated desulfurization and denitrification.
[0023] Saturated activated carbon in the semi-fixed bed adsorption tower is discharged through the outlet pipe, enters the discharge hopper via the discharge chain, and is then transferred to the activated carbon desorption tower for high-temperature desorption. The reactivated carbon is distributed according to the usage of the semi-fixed bed adsorption tower. Part of it enters the discharge chain via a three-way valve and is transferred to the feeding hopper, while the other part enters the distribution pipe via a three-way valve, is packaged by a baler, and transferred to the feeding hopper. It then re-enters the semi-fixed bed adsorption tower via the feeding chain for reaction, ultimately achieving the standard emission of flue gas pollutants.
[0024] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:
[0025] (1) The flue gas temperature is controlled by heat exchanger combined with cold air valve. The reducing agent is sprayed into the semi-fixed bed adsorption tower by spray structure. The reducing agent is used for denitrification. The semi-fixed bed adsorption tower is equipped with activated carbon bed to remove pollutants such as SO2, NOx, HF, dust, heavy metals, and dioxins. Desulfurization and denitrification are completed in one device in the semi-fixed bed adsorption tower, realizing integrated desulfurization and denitrification. No new denitrification device is required, avoiding the problems of large land area and large investment.
[0026] (2) No waste is generated by this desulfurization and denitrification integrated device. The by-products, concentrated sulfuric acid and activated carbon powder, can be comprehensively utilized, avoiding the problem of difficult solid waste treatment.
[0027] (3) The adsorption tower is a semi-fixed bed, combined with a material distribution chute, an outlet air box, an inlet air box and a temperature measuring device, so that the activated carbon flows intermittently. The activated carbon loss is much lower than that of traditional activated carbon adsorption process. While ensuring that the adsorption tower does not clog, clump, or overheat, it meets the environmental protection emission standards for flue gas.
[0028] (4) New activated carbon is obtained by high-temperature desorption of activated carbon in the activated carbon desorption tower. The new activated carbon is diverted by a three-way valve and distributed according to the usage. Part of it is supplied to the semi-fixed bed adsorption tower through the feeding chain, and the excess part is packaged by the baler through the diversion pipe and then transferred to the feeding system. Finally, it enters the semi-fixed bed adsorption tower. By realizing the recycling of activated carbon, the cost is reduced and the solid waste discharge is reduced.
[0029] (5) Use a debris filter to filter out debris brought in during unpacking and feeding, thereby improving the purity of the new activated carbon, enhancing its adsorption activity, and improving desulfurization efficiency. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of this utility model;
[0031] Figure 2 This is a schematic diagram of the semi-fixed bed adsorption tower in this utility model;
[0032] Figure 3 This is a schematic diagram of the activated carbon desorption tower and packaging structure in this utility model;
[0033] Figure 4 This is a schematic diagram showing the connection relationship of the surrounding structure of the upper hopper in this utility model.
[0034] Explanation of reference numerals in the attached drawings: 1. Heat exchanger; 2. Cooling air valve; 3. Booster fan; 4. Spray structure; 5. Semi-fixed bed adsorption tower; 501. Feed inlet; 502. Silo; 503. Distributor chute; 504. Rotary distributor; 505. Tower body; 506. Activated carbon bed; 507. Perforated plate on the side of the outlet air box; 508. Outlet air box; 509. Perforated plate on the side of the inlet air box; 510. Inlet air box; 511. Roller discharge structure; 512. Discharge chute; 513. Strip buffer plate; 514. Temperature measuring device; 515. Pressure measuring device; 516. CEMS pollutant emission online monitoring device; 6. Chimney; 7. Reducing agent storage device; 8. Intermittent bed operation control. 9. Discharge chain; 10. Discharge hopper; 11. Feeding chain; 12. Feeding hopper; 121. Debris filter screen; 122. Support unpacking structure; 123. Screw feeder; 124. Weighing level gauge; 125. Slide valve; 126. Flange; 127. Chute; 13. Activated carbon desorption tower; 131. Tower body; 132. Roller feeder; 133. Three-way valve; 134. Distribution pipe; 135. Discharge chain; 136. Transfer belt; 14. Packing structure; 141. Buffer hopper; 142. Buffer strip; 143. V-shaped rotary valve; 144. Packing machine; 145. Transfer structure; 15. Lifting structure; 151. Fixed beam; 152. Lifting electric hoist. Detailed Implementation
[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0036] like Figure 1As shown, an integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas includes a heat exchanger 1, a semi-fixed bed adsorption tower 5, a reducing agent storage device 7, and an activated carbon desorption tower 13. The outlet of the heat exchanger 1 is connected to a booster fan 3, and a cooling air valve 2 connects the heat exchanger 1 and the booster fan 3. The outlet of the booster fan 3 is connected to the inlet flue of the semi-fixed bed adsorption tower 5. An outlet flue is provided on the side wall of the semi-fixed bed adsorption tower 5, and the outlet flue and the inlet flue are located on different sides of the semi-fixed bed adsorption tower 5. The outlet flue is connected to a chimney 6. The reducing agent storage device 7 is connected to an injection structure 4, which is inserted into the inlet flue wall of the semi-fixed bed adsorption tower 5 via a pipe. The semi-fixed bed adsorption tower 5 is connected to a bed intermittent operation control system 8. The bottom outlet pipe of the semi-fixed bed adsorption tower 5 is connected to the discharge chain 9, which in turn is connected to the discharge hopper 10. The top of the semi-fixed bed adsorption tower 5 has a feeding port 501, which is connected to the feeding chain 11, which in turn is connected to the feeding hopper 12. The flue gas temperature is controlled by a heat exchanger and a booster fan to ensure that the temperature of the flue gas entering the semi-fixed bed adsorption tower does not exceed 140°C. A reducing agent is sprayed into the semi-fixed bed adsorption tower through a spray structure for denitrification. Desulfurization and denitrification are both completed in the semi-fixed bed adsorption tower, realizing integrated desulfurization and denitrification. Denitrification does not require additional equipment, saving costs and reducing the floor space. The entire process of feeding, desulfurization, denitrification, and discharge is intelligently controlled by a bed intermittent operation control system.
[0037] A further embodiment of this utility model is as follows: Figure 2 As shown, the semi-fixed bed adsorption tower 5 also includes a hopper 502. The hopper 502 is connected below the feed inlet 501. The lower part of the hopper 502 is cone-shaped, and a strip-shaped buffer plate 513 is installed at the bottom of the hopper 502. Multiple distribution chutes 503 are provided at the bottom of the hopper 502, and rotary distributors 504, which are swirl vanes, are installed inside each distribution chute 503. The bottoms of the distribution chutes 503 are connected to the tower body 505, which contains an activated carbon bed 506. An outlet bellows side mesh plate 507 is installed on the side wall of the outlet flue of the tower body 505, and an outlet bellows 508 is installed outside the side wall of the outlet flue. An inlet bellows side mesh plate 507 is installed on the side wall of the inlet flue of the tower body. 9. An inlet air box 510 is installed on the side wall of the inlet flue. The bottom of the tower body 505 is connected to a roller discharge structure 511, which is connected to a discharge chute 512. The discharge chute 512 is equipped with a buffer structure, and the outlet pipe of the discharge chute 512 is connected to the discharge chain 9. The impact of the activated carbon on the silo is reduced by the strip buffer plate inside the silo, extending the service life of the silo. The activated carbon bed adsorbs pollutants such as SO2, HF, dust, heavy metals, and dioxins. Combined with catalyst denitrification, the byproducts are concentrated sulfuric acid and activated carbon powder, with no waste generated. The outlet air box and inlet air box ensure that the adsorption tower is not blocked or agglomerated, ensuring stable operation of the bed.
[0038] In a further embodiment of this utility model, the activated carbon bed 506 is connected to a temperature measuring device 514, the inlet air box 510 and the outlet air box 508 are both connected to a pressure measuring device 515, and the outlet flue is connected to a CEMS pollutant emission online monitoring device 516. The temperature measuring device 514, the pressure measuring device 515 and the CEMS pollutant emission online monitoring device 516 are all connected to the bed intermittent operation control system 8. Through the temperature measuring device, the pressure measuring device and the CEMS pollutant emission online monitoring device, it is ensured that when the flue gas volume, flue gas temperature and flue gas pressure fluctuate with the production reversal rhythm of the hot blast stove, the flue gas meets the emission standards and achieves near-zero emissions.
[0039] A further embodiment of this utility model is as follows: Figure 3 As shown, the activated carbon desorption tower 13 includes a tower body 131, with a feed inlet at the top and a roller feeder 132 at the bottom. A three-way valve 133 is connected to the discharge port at the bottom of the roller feeder 132. The other two ends of the three-way valve 133 are connected to a distribution pipe 134 and a discharge chain 135, respectively. A buffer plate is installed inside the distribution pipe 134, and a conveyor belt 136 is installed at the outlet of the distribution pipe 134. A packaging structure 14 is located below the end of the conveyor belt 136. The packaging structure 14 includes a buffer chamber 141, the lower part of which is funnel-shaped. A buffer bar 142 is installed in the lower part of the 141. A V-shaped rotary valve 143 is connected below the buffer chamber 141. A baler 144 is connected below the V-shaped rotary valve 143. The baler 144 is connected to the transfer structure 145. New carbon with restored activity is obtained through high-temperature desorption in the tower body. The feed amount is precisely controlled by a roller feeder to avoid waste. Part of the carbon is transported to the baling structure for baling through the distribution pipe and the transfer belt. Part of the carbon is transported to the feeding hopper through the discharge chain. The excess new carbon with restored activity is sealed by the baler to prevent the adsorption activity of the new carbon with restored activity from decreasing.
[0040] A further embodiment of this utility model is as follows: Figure 4As shown, a debris filter screen 121 is connected above the feeding hopper 12. The debris filter screen 121 is a stainless steel grating structure. A support unpacking structure 122 is connected above the debris filter screen 121. The lower part of the feeding hopper 122 is funnel-shaped. A screw feeder 123 is installed inside the lower part of the feeding hopper 12. A weighing level gauge 124 is installed on the lower outer wall of the feeding hopper 12. A slide gate valve 125 is connected below the feeding hopper 12. The slide gate valve 125 is connected to a chute 127 through a flange 126. A layered buffer plate 1 is installed inside the chute 127. 28. The chute 127 is connected to the feeding chain 11 below; a lifting structure 15 is provided above the unpacking structure 122, the lifting structure 15 includes a fixed beam 151, and a lifting electric hoist 152 is fixed below the fixed beam 151; the lifting electric hoist lifts the activated carbon bags to the feeding hopper, which is convenient and quick and improves production efficiency; the debris filter screen filters out the debris after unpacking and during the feeding process, improving the purity of the activated carbon and enhancing its adsorption activity; the layered buffer plate slows down the falling speed of the activated carbon and prevents the activated carbon particles from breaking.
Claims
1. An integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas, characterized in that, The system includes a heat exchanger, a semi-fixed bed adsorption tower, a reducing agent storage device, and an activated carbon desorption tower. The heat exchanger outlet is connected to a booster fan, and a cooling air valve is connected between the heat exchanger and the booster fan. The booster fan outlet is connected to the inlet flue of the semi-fixed bed adsorption tower. An outlet flue is provided on the side wall of the semi-fixed bed adsorption tower, and the outlet flue and the inlet flue are on different sides of the semi-fixed bed adsorption tower. The outlet flue is connected to a chimney. The reducing agent storage device is connected to a spraying structure, and the spraying structure is inserted into the inlet flue wall of the semi-fixed bed adsorption tower through a pipe. The semi-fixed bed adsorption tower is connected to a bed intermittent operation control system. The bottom outlet pipe of the semi-fixed bed adsorption tower is connected to a discharge chain, and the discharge chain is connected to a discharge hopper. A feeding port is opened at the top of the semi-fixed bed adsorption tower, and the feeding port is connected to a feeding chain, which is connected to a feeding hopper.
2. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 1, characterized in that, The semi-fixed bed adsorption tower also includes a silo. The silo is connected below the feed inlet. The bottom of the silo is provided with multiple distribution chutes. A rotary distributor is installed in each distribution chute. The rotary distributor is a swirl vane. The bottom of each distribution chute is connected to the tower body. An activated carbon bed is installed inside the tower body. The side wall of the outlet flue of the tower body is provided with an outlet air box side mesh plate. An outlet air box is installed outside the side wall of the outlet flue. The side wall of the inlet flue of the tower body is provided with an inlet air box side mesh plate. An inlet air box is installed outside the side wall of the inlet flue. A roller unloading structure is connected to the bottom of the tower body. The roller unloading structure is connected to a discharge chute. The outlet pipe of the discharge chute is connected to a discharge chain.
3. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 2, characterized in that, The lower part of the hopper is cone-shaped, and a strip buffer plate is installed inside the lower part of the hopper.
4. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 3, characterized in that, The material chute is equipped with a buffer structure.
5. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 4, characterized in that, The activated carbon bed is connected to a temperature measuring device, the inlet and outlet air boxes are both connected to a pressure measuring device, and the outlet flue is connected to a CEMS pollutant emission online monitoring device. The temperature measuring device, pressure measuring device, and CEMS pollutant emission online monitoring device are all connected to the bed intermittent operation control system.
6. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to any one of claims 1 or 5, characterized in that, The activated carbon desorption tower includes a tower body, with a feed inlet at the top and a roller feeder at the bottom. The discharge port at the bottom of the roller feeder is connected to a three-way valve, and the other two ends of the three-way valve are respectively connected to a distribution pipe and a discharge chain. The distribution pipe is equipped with a buffer plate, and a transfer belt is provided at the outlet of the distribution pipe. A packaging structure is provided below the end of the transfer belt.
7. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 6, characterized in that, The packaging structure includes a buffer chamber with a funnel-shaped lower part and a buffer strip inside the lower part of the buffer chamber. A V-shaped rotary valve is connected below the buffer chamber, and a packaging machine is connected below the V-shaped rotary valve. The packaging machine is connected to a transfer structure.
8. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 7, characterized in that, The upper part of the feeding hopper is connected to a debris filter screen, which is a stainless steel grid structure. Above the debris filter screen is a support unpacking structure. The lower part of the feeding hopper is funnel-shaped, and a screw feeder is installed inside the lower part of the feeding hopper. A weighing level gauge is installed on the lower outer wall of the feeding hopper. A slide valve is connected to the lower part of the feeding hopper. The slide valve is connected to a chute through a flange. The chute is equipped with a layered buffer plate, and the feeding chain abuts against the bottom of the chute.
9. The integrated desulfurization and denitrification device for blast furnace hot blast stove flue gas according to claim 8, characterized in that, A lifting structure is provided above the supporting unpacking structure. The lifting structure includes a fixed beam, and a lifting electric hoist is fixed below the fixed beam.