Flue gas desulfurization and denitrification integrated device and method for blast furnace hot blast stove

Abstract

The invention belongs to the technical field of flue gas treatment, and particularly relates to a flue gas desulfurization and denitrification integrated device and method for a blast furnace hot blast stove. An outlet of a heat exchanger is connected with a booster fan, a cold air mixing valve is connected between the heat exchanger and the booster fan, and an outlet of the booster fan is connected with an inlet flue of a semi-fixed bed adsorption tower; an outlet flue is arranged on the side wall of the semi-fixed bed adsorption tower, the outlet flue and the inlet flue are arranged on different sides of the semi-fixed bed adsorption tower, the reducing agent storage device is connected with the injection structure, the injection structure is inserted into the inlet flue wall of the semi-fixed bed adsorption tower through a pipeline, and the semi-fixed bed adsorption tower is connected with the bed intermittent operation control system. An outlet pipeline at the bottom of the semi-fixed bed adsorption tower is connected with a discharging chain, the discharging chain is connected with a discharging bin, a feeding opening in the top end of the semi-fixed bed adsorption tower is connected with a feeding chain, and the feeding chain is connected with a feeding bin. The device completes desulfurization and denitrification in the semi-fixed bed adsorption tower, no additional device is needed for denitrification, the occupied area is small, and the investment is low; by-products can be comprehensively utilized, and zero waste discharge is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas treatment, and in particular relates to an integrated device and method for desulfurization and denitrification of flue gas from a blast furnace hot blast stove. Background Art

[0002] The fuel gas used in the hot blast furnace of iron-making blast furnace generally comes from the three major gases produced in the production process of steel enterprises: blast furnace gas, coke oven gas, and converter gas. 2 The source mainly comes from the total sulfur in the fuel gas used, mainly hydrogen sulfide and carbonyl sulfide. The source of NOx in flue gas is mainly temperature-thermal NO. The higher the combustion temperature, the higher the NO concentration. Studies have shown that NO accounts for 95% of the NOx formed during combustion. 2 About 5%. The characteristics of the flue gas from the hot blast furnace of the ironmaking blast furnace are as follows: (1) The temperature of flue gas discharged from the hot blast furnace fluctuates greatly, generally between 150 and 200°C; (2) Hot blast furnaces generally use blast furnace gas as fuel, and the levels of sulfur dioxide and nitrogen oxides in the flue gas are relatively low; (3) When the hot blast furnace switches its working condition, the flue gas volume, flue gas temperature and flue gas pressure change greatly.

[0003] The existing blast furnace hot blast stove flue gas desulfurization and denitrification devices and defects are as follows: (1) Dry desulfurization + SCR denitrification: Highly active calcium hydroxide (or ground baking soda) powder is used as a desulfurizer and sprayed into the desulfurization device to absorb sulfur dioxide in the flue gas through chemical reaction. The flue gas after desulfurization carries high-concentration dust, enters the dust collector for filtration, and then is discharged after SCR denitrification, generating solid waste calcium sulfate, calcium sulfite (baking soda method generates hazardous waste sodium sulfate), sodium sulfite, which are difficult to handle; the newly added SCR denitrification and bag dust removal occupy a large area and require a large investment; (2) Calcium-based fixed bed desulfurization + SCR denitrification: Calcium-based desulfurizer particles are installed in the desulfurization reactor. The flue gas passes through the desulfurizer bed. Under the catalytic action of the calcium-based desulfurizer, sulfur dioxide is oxidized into sulfur trioxide, and reacts with the calcium-based desulfurizer to form calcium sulfate, which is solidified in the desulfurizer. The flue gas after desulfurization is discharged after SCR denitrification, and the solid waste calcium sulfate is difficult to handle; the newly added SCR denitrification occupies a large area and requires a large investment; (3) Wet desulfurization + SCR denitrification: Alkaline slurry or solution is used as absorbent, and the flue gas in the absorption tower is sprayed and washed. Sulfur dioxide and absorbent react to form sulfite and sulfate. The flue gas is heated and then discharged after SCR denitrification. The exhaust gas temperature is low, which corrodes the flue and equipment; solid waste sulfate and wastewater are difficult to treat; the newly added SCR denitrification occupies a large area; (4) Semi-dry desulfurization + SCR denitrification: slaked lime is used as an absorbent, and a circulating fluidized bed is used as a desulfurization reactor to desulfurize the flue gas, generating calcium sulfite and calcium sulfate. A bag filter is installed at the rear to collect the desulfurization ash. The flue gas is finally discharged after SCR denitrification. The exhaust 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. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated device and method for desulfurization and denitrification of blast furnace hot blast stove flue gas, so as to solve the problems that solid waste after desulfurization in existing devices is difficult to handle, denitrification requires new devices, occupies a large area and requires large investment.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme: A blast furnace hot blast stove flue gas desulfurization and denitrification integrated device comprises a heat exchanger, a semi-fixed bed adsorption tower, a reducing agent storage device and an activated carbon analysis tower, the heat exchanger outlet is connected to a booster fan, a cold air valve is connected between the heat exchanger and the booster fan, the booster fan outlet is connected to an inlet flue of the semi-fixed bed adsorption tower, an outlet flue is arranged on a side wall of the semi-fixed bed adsorption tower, 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 an injection structure, the injection structure is plugged into the inlet flue wall of the semi-fixed bed adsorption tower through a pipeline, the semi-fixed bed adsorption tower is connected to a bed intermittent operation control system, the outlet pipeline at the bottom of the semi-fixed bed adsorption tower is connected to a discharging chain, the discharging chain is connected to a discharging bin, a feeding port is arranged on the top of the semi-fixed bed adsorption tower, the feeding port is connected to a feeding chain, and the feeding chain is connected to a feeding bin.

[0006] Preferably, the semi-fixed bed adsorption tower also includes a silo, which is connected to the silo below the feed port, and a plurality of material distribution chutes are arranged at the bottom of the silo, and a rotary distributor is arranged in the material distribution chute, and the rotary distributor is a swirl vane. The bottoms of the material distribution chutes are respectively connected to the tower body, and an activated carbon bed is arranged in the tower body. The outlet flue side wall of the tower body is provided with an outlet bellows side mesh plate, and an outlet bellows is arranged outside the outlet flue side wall. The inlet flue side wall of the tower body is provided with an inlet bellows side mesh plate, and an inlet bellows is arranged outside the inlet flue side wall. The bottom end of the tower body is connected to a roller unloading structure, and the roller unloading structure is connected to a discharge chute, and the outlet pipe of the discharge chute is connected to a discharge chain.

[0007] Preferably, the lower portion of the silo is in a cone shape, and a strip buffer plate is arranged in the lower portion of the silo.

[0008] Preferably, a buffer structure is provided in the discharge chute.

[0009] Preferably, the activated carbon bed is connected to a temperature measuring device, the inlet bellows and the outlet bellows 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, the pressure measuring device and the CEMS pollutant emission online monitoring device are all connected to the bed intermittent operation control system.

[0010] Preferably, the activated carbon analysis tower comprises a tower body, a feed inlet is arranged at the top of the tower body, a roller feeder is arranged at the bottom of the tower body, the discharge port at the bottom of the roller feeder is connected to a three-way valve, the other two ends of the three-way valve are respectively connected to a distribution pipe and a discharge chain, a buffer card plate is arranged in the distribution pipe, a transfer belt is arranged at the outlet of the distribution pipe, and a packaging structure is arranged below the end of the transfer belt.

[0011] Preferably, the packaging structure includes a buffer bin, the lower portion of which is funnel-shaped, a buffer strip is arranged in the lower portion of the buffer bin, a V-shaped rotary valve is connected below the buffer bin, a packaging machine is connected below the V-shaped rotary valve, and the packaging machine is connected to the transfer structure.

[0012] Preferably, a debris filter is connected above the feeding bin, and the debris filter is a stainless steel grid structure. A support unpacking structure is connected above the debris filter. The lower part of the feeding bin is funnel-shaped. A spiral feeder is provided in the lower part of the feeding bin. A weighing level meter is installed on the lower outer wall of the feeding bin. A gate valve is connected below the feeding bin, and the gate valve is connected to the chute through a flange. A layered buffer plate is provided in the chute, and the feeding chain is abutted below the chute.

[0013] Preferably, a lifting structure is provided above the supporting unpacking structure, and the lifting structure comprises a fixed beam, and a lifting electric hoist is fixed below the fixed beam.

[0014] A method for integrating desulfurization and denitrification of blast furnace hot blast stove flue gas based on the above device, the specific steps are as follows: S1: The flue gas from the hot blast furnace is cooled down to about 135℃ by the heat exchanger, and then enters the booster fan. The cold air valve, cold air duct and cold air silencer are used as safety measures. When the efficiency of the heat exchanger decreases or the equipment is under maintenance, cold air is added to cool the flue gas to ensure that the flue gas temperature does not exceed 140℃, and then enters the booster fan. The cooled flue gas enters the semi-fixed bed adsorption tower; S2: The injection structure of the flue wall at the entrance of the adsorption tower sprays the reducing agent of the reducing agent storage device into the semi-fixed bed adsorption tower. The reducing agent is used for denitration in the semi-fixed bed adsorption tower. Combined with the activated carbon bed in the semi-fixed bed adsorption tower, SO 2 , NO X , HF, dust, heavy metals, dioxins and other pollutants; S3: Pressure measuring device for outlet and inlet bellows, temperature measuring device for activated carbon bed, CEMS pollutant emission online monitoring device combined with bed intermittent operation control system to control the moving speed and start and stop of activated carbon bed, to ensure that there is no blockage, agglomeration or over-temperature in the semi-fixed bed adsorption tower; S4: The activated carbon saturated with adsorption in the semi-fixed bed adsorption tower is discharged through the outlet pipe, enters the discharge bin through the discharge chain, and is then transferred to the activated carbon analysis tower for high-temperature analysis. The newly activated carbon is distributed according to the usage of the semi-fixed bed adsorption tower. One part enters the distribution pipe from the three-way valve of the activated carbon analysis tower, is packaged by the packaging machine, and is then transferred to the loading bin. It is lifted to the loading bin by the lifting structure, and the other part enters the discharge chain from the three-way valve of the activated carbon analysis tower and returns to the semi-fixed bed adsorption tower; S5: The debris filter removes the debris brought in by unpacking and loading. The weighing level meter detects the height of the activated carbon in the bin in real time. The layered buffer plate in the chute slows down the falling speed, and the material enters the semi-fixed bed adsorption tower again through the loading chain for reaction. S6: The system operation status is monitored in real time through the bed intermittent operation control system, the intermittent flow automation of the activated carbon bed in the adsorption tower is realized, and the desulfurization and denitrification integration is completed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The flue gas temperature is controlled by a heat exchanger combined with a cold air valve, and a reductant is sprayed into a semi-fixed bed adsorption tower using an injection structure. The reductant is used for denitrification. An activated carbon bed is set in the semi-fixed bed adsorption tower to remove SO 2 , NOX, HF, dust, heavy metals, dioxins and other pollutants are desulfurized and denitrated in one device of the semi-fixed bed adsorption tower, realizing the integration of desulfurization and denitration. No new equipment is required for denitration, avoiding the problem of large land occupation and large investment; (2) This integrated desulfurization and denitrification device does not generate any waste, and the by-products, concentrated sulfuric acid and activated carbon powder, can be comprehensively utilized, thus avoiding the problem of difficult solid waste treatment; (3) The adsorption tower is a semi-fixed bed, combined with a material distribution chute, an outlet bellows, an inlet bellows and a temperature measuring device, so that the activated carbon flows intermittently. The loss of activated carbon is much lower than that of the traditional activated carbon adsorption process. While ensuring that there is no blockage, no agglomeration and no overheating in the adsorption tower, the flue gas meets the environmental protection emission standards. (4) Activated new carbon is obtained by high-temperature analysis in an activated carbon analysis tower, and a three-way valve is used to divert the activated new carbon. According to the usage, a part of it is supplied to a semi-fixed bed adsorption tower through a feeding chain, and the excess part enters a packaging machine through a diversion pipe, is packaged, and then transported into a feeding system, and finally enters a semi-fixed bed adsorption tower. By realizing the recycling of activated carbon, costs are reduced and solid waste emissions are reduced; (5) Use the debris filter to filter out the debris brought in by unpacking and loading, improve the purity of the activated new carbon, enhance the adsorption activity, and improve the desulfurization efficiency; (6) The method of the present invention can reasonably control the temperature of the flue gas entering the semi-fixed bed adsorption tower, spray the reducing agent into the semi-fixed bed adsorption tower, and combine it with the activated carbon bed in the semi-fixed bed adsorption tower to achieve integrated desulfurization and denitrification with a small footprint. The by-product activated carbon of the method can be obtained by high-temperature analysis in an activated carbon analysis tower to obtain new carbon, which can be reused to reduce costs. The other by-product concentrated sulfuric acid can also be reused, and no difficult-to-treat solid waste is generated. Combined with the temperature measuring device and the pressure measuring device, the bed intermittent operation control system is used for intelligent control to improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the semi-fixed bed adsorption tower in the present invention; Figure 3 It is a schematic diagram of the activated carbon analysis tower and packaging structure in the present invention; Figure 4 It is a schematic diagram of the connection relationship of the peripheral structure of the upper silo in the present invention.

[0017] Explanation of the reference numerals: 1. heat exchanger; 2. cold air valve; 3. booster fan; 4. injection structure; 5. semi-fixed bed adsorption tower; 501. loading port; 502. silo; 503. material distribution chute; 504. rotary distributor; 505. tower body; 506. activated carbon bed; 507. mesh plate on the side of outlet wind box; 508. outlet wind box; 509. mesh plate on the side of inlet wind box; 510. inlet wind box; 511. roller unloading structure; 512. material 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. bed intermittent operation control control system; 9. discharge chain; 10. discharge bin; 11. loading chain; 12. loading bin; 121. debris filter; 122. support and unpacking structure; 123. spiral feeder; 124. weighing level meter; 125. gate valve; 126. flange; 127. chute; 13. activated carbon analysis tower; 131. tower body; 132. roller feeder; 133. three-way valve; 134. material distribution pipe; 135. discharge chain; 136. transfer belt; 14. packaging structure; 141. buffer bin; 142. buffer strip; 143. V-shaped rotary valve; 144. baler; 145. transfer structure; 15. lifting structure; 151. fixed beam; 152. lifting electric hoist. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, an integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove comprises a heat exchanger 1, a semi-fixed bed adsorption tower 5, a reducing agent storage device 7 and an activated carbon analysis tower 13, the outlet of the heat exchanger 1 is connected to a booster fan 3, a cold air mixing valve 2 is connected between the heat exchanger 1 and the booster fan 3, the outlet of the booster fan 3 is connected to an inlet flue of the semi-fixed bed adsorption tower 5, an outlet flue is arranged on a side wall of the semi-fixed bed adsorption tower 5, the outlet flue and the inlet flue are 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, the injection structure 4 is plugged into the inlet flue wall of the semi-fixed bed adsorption tower 5 through a pipeline, and 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, the discharge chain 9 is connected to the discharge bin 10, and a loading port 501 is provided at the top of the semi-fixed bed adsorption tower 5, the loading port 501 is connected to the loading chain 11, and the loading chain 11 is connected to the loading bin 12; the flue gas temperature is controlled by a heat exchanger and a booster fan to ensure that the flue gas temperature entering the semi-fixed bed adsorption tower does not exceed 140°C, and the reducing agent is sprayed into the semi-fixed bed adsorption tower through the injection structure for denitrification. Desulfurization and denitrification are completed in the semi-fixed bed adsorption tower to realize the integration of desulfurization and denitrification. No new equipment is required for denitrification, which saves costs and reduces the floor space; the bed intermittent operation control system is controlled to realize the overall intelligent control of loading, desulfurization, denitrification and discharging.

[0020] A further embodiment of the present invention is as follows: Figure 2 As shown, the semi-fixed bed adsorption tower 5 also includes a silo 502, the lower part of the feed port 501 is connected to the silo 502, the lower part of the silo 502 is in the shape of a cone, a strip buffer plate 513 is arranged at the lower part of the silo 502, a plurality of material distribution chutes 503 are arranged at the bottom of the silo 502, a rotary material distributor 504 is arranged in the material distribution chute 503, and the rotary material distributor 504 is a swirl blade; the bottom of the material distribution chute 503 is respectively connected to the tower body 505, the tower body 505 is provided with an activated carbon bed 506, and the side wall of the outlet flue of the tower body 505 is provided with an outlet wind box side mesh plate 507, an outlet wind box 508 is arranged outside the side wall of the outlet flue, an inlet wind box side mesh plate 509 is arranged on the side wall of the inlet flue of the tower body, an inlet wind box 510 is arranged outside the side wall of the inlet flue, the bottom of the tower body 505 is connected to a roller unloading structure 511, the roller unloading structure 511 is connected to a material discharge chute 512, a buffer structure is arranged inside the material discharge chute 512, and the outlet pipe of the material discharge chute 512 is connected to a discharge chain 9; the impact of the activated carbon on the silo is reduced by the strip buffer plate in the silo, thereby extending the service life of the silo; the activated carbon bed is used to adsorb SO 2 , HF, dust, heavy metals, dioxins and other pollutants, combined with catalyst denitrification, by-products are concentrated sulfuric acid and activated carbon powder, and no waste is generated; the outlet bellows and inlet bellows are used to ensure that the adsorption tower is not blocked or agglomerated, ensuring stable operation of the bed.

[0021] A further implementation method of the present invention is that the activated carbon bed 506 is connected to a temperature measuring device 514, the inlet bellows 510 and the outlet bellows 508 are both connected to a pressure measuring device 515, the outlet flue is connected to a CEMS pollutant emission online monitoring device 516, and 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 hot blast furnace production reversing rhythm, the flue gas emissions meet the standards and achieve near "zero" emissions.

[0022] A further embodiment of the present invention is as follows: Figure 3 As shown, the activated carbon analysis tower 13 includes a tower body 131, a feed port is arranged at the top of the tower body 131, a roller feeder 132 is arranged at the bottom of the tower body 131, a discharge port at the bottom of the roller feeder 132 is connected to a three-way valve 133, and the other two ends of the three-way valve 133 are respectively connected to a distribution pipe 134 and a discharge chain 135, a buffer card plate is arranged in the distribution pipe 134, a transfer belt 136 is arranged at the outlet of the distribution pipe 134, and a packaging structure 14 is arranged below the end of the transfer belt 136; the packaging structure 14 includes a buffer bin 141, the lower part of the buffer bin 141 is funnel-shaped, and the buffer bin A buffer bar 142 is provided at the lower part of 141, a V-shaped rotary valve 143 is connected to the lower part of the buffer bin 141, a baler 144 is connected to the lower part of the V-shaped rotary valve 143, and the baler 144 is connected to the transfer structure 145; high-temperature analysis is performed on the tower body to obtain new carbon with restored activity, and a roller feeder is used to accurately control the feeding amount to avoid waste; a part of the new carbon is transported to the baling structure through a distribution pipe and a transfer belt, and a part of the new carbon is transported to the upper bin through a discharging chain, and 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 being reduced.

[0023] A further embodiment of the present invention is as follows: Figure 4As shown, the upper part of the upper bin 12 is connected to a debris filter 121, which is a stainless steel grid structure, and the upper part of the debris filter 121 is connected to a support unpacking structure 122, the lower part of the upper bin 122 is funnel-shaped, a spiral feeder 123 is arranged in the lower part of the upper bin 12, a weighing level meter 124 is installed on the lower outer wall of the upper bin 12, and a gate valve 125 is connected to the lower part of the upper bin 12, and the gate valve 125 is connected to the chute 127 through a flange 126, and the chute 127 is provided with a layered buffer plate 124. 28. The lower part of the chute 127 abuts against the feeding chain 11; a lifting structure 15 is arranged above the supporting unpacking structure 122, and the lifting structure 15 comprises a fixed beam 151, and a lifting electric hoist 152 is fixed below the fixed beam 151; the activated carbon package is lifted to the feeding bin by the lifting electric hoist, which is convenient and quick, and improves production efficiency; the debris after unpacking and during the feeding process is filtered out by the debris filter net, so as to improve the purity of the activated carbon and enhance the adsorption activity; the layered buffer plate slows down the falling speed of the activated carbon and prevents the activated carbon particles from breaking.

[0024] A method for integrating desulfurization and denitrification of blast furnace hot blast stove flue gas based on the above device, the specific steps are as follows: S1: The flue gas from the hot blast furnace passes through the heat exchanger 1 and is stably cooled to about 135°C, and then enters the booster fan 3. If the temperature is still too high, open the cold air valve 2 to ensure that the flue gas temperature does not exceed 140°C, and then enters the booster fan 3. The cooled flue gas enters the semi-fixed bed adsorption tower 5; S2: The injection structure 4 of the inlet flue wall sprays the reducing agent from the reducing agent storage device 7 into the semi-fixed bed adsorption tower 5. The reducing agent is used for denitration in the semi-fixed bed adsorption tower 5. Combined with the activated carbon bed 506 in the semi-fixed bed adsorption tower 5, SO 2 , NOX, HF, dust, heavy metals, dioxins and other pollutants; S3: The temperature measuring device 514 of the activated carbon bed 506, the pressure measuring device 515 of the outlet bellows 508 and the inlet bellows 510, and the CEMS pollutant emission online monitoring device 516 are combined with the bed intermittent operation control system 8 to control the start and stop and speed of the stick type discharger 511 to ensure that there is no blockage, no agglomeration, and no over-temperature in the semi-fixed bed adsorption tower; S4: The activated carbon saturated with adsorption in the semi-fixed bed adsorption tower 5 is discharged through the outlet pipe, enters the discharge bin 10 through the discharge chain 9, and is then transported to the activated carbon analysis tower 13 for high-temperature analysis. The newly activated carbon is distributed according to the usage of the semi-fixed bed adsorption tower 5. A part of it is packaged by the packaging machine 14 from the distribution pipe 134 of the activated carbon analysis tower 13 and then transported to the upper bin 12, and is hoisted to the upper bin 12 by the lifting structure 15. The other part returns to the semi-fixed bed adsorption tower from the discharge chain 135 of the activated carbon analysis tower 13; S5: The debris filter 121 filters out the debris brought in by unpacking and loading, the weighing level meter 124 detects the height of the activated carbon position in the bin in real time, the layered buffer plate in the chute 127 slows down the falling speed, and the material enters the semi-fixed bed adsorption tower 5 again through the loading chain 11 for reaction; S6: The system operation status is monitored in real time through the bed intermittent operation control system 8, so as to realize the automation of the intermittent flow of the activated carbon bed 506 in the semi-fixed bed adsorption tower 5 and complete the integration of desulfurization and denitrification.

Claims

1. An integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove, characterized in that: It includes a heat exchanger, a semi-fixed bed adsorption tower, a reducing agent storage device and an activated carbon analysis tower, the outlet of the heat exchanger is connected to a booster fan, a cold 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, the side wall of the semi-fixed bed adsorption tower is provided with an outlet flue, 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 an injection structure, the injection structure is plugged into the inlet flue wall of the semi-fixed bed adsorption tower through a pipeline, the semi-fixed bed adsorption tower is connected to a bed intermittent operation control system, the outlet pipeline at the bottom of the semi-fixed bed adsorption tower is connected to a discharging chain, the discharging chain is connected to a discharging bin, a feeding port is provided at the top of the semi-fixed bed adsorption tower, the feeding port is connected to a feeding chain, and the feeding chain is connected to a feeding bin.

2. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 1, characterized in that: The semi-fixed bed adsorption tower also includes a silo, which is connected to the silo below the feed port, and a plurality of material distribution chutes are arranged at the bottom of the silo, and a rotary material distributor is arranged in the material distribution chute, and the rotary material distributor is a swirl vane. The bottoms of the material distribution chutes are respectively connected to the tower body, and an activated carbon bed is arranged in the tower body. The outlet flue side wall of the tower body is provided with an outlet bellows side mesh plate, and the outlet flue side wall is provided with an outlet bellows outside. The inlet flue side wall of the tower body is provided with an inlet bellows side mesh plate, and the inlet flue side wall is provided with an inlet bellows outside. The bottom end of the tower body is connected to a roller unloading structure, and the roller unloading structure is connected to a discharge chute, and the outlet pipe of the discharge chute is connected to a discharge chain.

3. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 2, characterized in that: The lower part of the silo is in a cone shape, and a strip buffer plate is arranged in the lower part of the silo.

4. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 3, characterized in that: A buffer structure is arranged inside the unloading chute.

5. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 4, characterized in that: The activated carbon bed is connected to a temperature measuring device, the inlet bellows and the outlet bellows 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, the pressure measuring device and the CEMS pollutant emission online monitoring device are all connected to a bed intermittent operation control system.

6. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to any one of claims 1 or 5, characterized in that: The activated carbon analysis tower comprises a tower body, the top of the tower body is provided with a feed port, the bottom of the tower body is a roller feeder, the discharge port at the bottom of the roller feeder is connected to a three-way valve, the other two ends of the three-way valve are respectively connected to a distribution pipe and a discharge chain, a buffer card plate is arranged in the distribution pipe, a transfer belt is arranged at the outlet of the distribution pipe, and a packaging structure is arranged below the end of the transfer belt.

7. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 6, characterized in that: The packaging structure includes a buffer bin, the lower part of which is funnel-shaped, a buffer strip is arranged in the lower part of the buffer bin, a V-shaped rotary valve is connected below the buffer bin, a packaging machine is connected below the V-shaped rotary valve, and the packaging machine is connected to the transfer structure.

8. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 7, characterized in that: The upper part of the feeding bin is connected with a debris filter screen, which is a stainless steel grille structure. The upper part of the debris filter screen is connected with a support unpacking structure. The lower part of the feeding bin is funnel-shaped. A spiral feeder is arranged in the lower part of the feeding bin. A weighing level meter is installed on the lower outer wall of the feeding bin. The lower part of the feeding bin is connected with a gate valve, which is connected to a chute through a flange. A layered buffer plate is arranged in the chute, and a feeding chain is abutted at the lower part of the chute.

9. The integrated device for desulfurization and denitrification of flue gas from a blast furnace hot blast stove according to claim 8, characterized in that: A lifting structure is arranged above the supporting unpacking structure, and the lifting structure comprises a fixed beam, and a lifting electric hoist is fixed below the fixed beam.

10. A method for integrating desulfurization and denitrification of blast furnace hot blast stove flue gas based on the device according to claim 9, characterized in that: The specific steps are as follows: S1: The flue gas from the hot blast furnace is cooled down to about 135℃ by the heat exchanger and then enters the booster fan. The valve, cold air pipe and cold air silencer at the inlet of the booster fan are used as safety measures. When the efficiency of the heat exchanger decreases or the equipment is under maintenance, cold air is added to cool the flue gas to ensure that the flue gas temperature does not exceed 140℃. The flue gas then enters the booster fan and the cooled flue gas enters the semi-fixed bed adsorption tower. S2: The injection structure of the flue wall at the entrance of the adsorption tower sprays the reducing agent of the reducing agent storage device into the semi-fixed bed adsorption tower. The reducing agent is used for denitration in the semi-fixed bed adsorption tower. Combined with the activated carbon bed in the semi-fixed bed adsorption tower, SO2, NO X , HF, dust, heavy metals, dioxins and other pollutants; S3: Pressure measuring device for outlet and inlet bellows, temperature measuring device for activated carbon bed, CEMS pollutant emission online monitoring device combined with bed intermittent operation control system to control the moving speed and start and stop of activated carbon bed, to ensure that there is no blockage, agglomeration or over-temperature in the semi-fixed bed adsorption tower; S4: The activated carbon saturated with adsorption in the semi-fixed bed adsorption tower is discharged through the outlet pipe, enters the discharge bin through the discharge chain, and is then transferred to the activated carbon analysis tower for high-temperature analysis. The newly activated carbon is distributed according to the usage of the semi-fixed bed adsorption tower. One part enters the distribution pipe from the three-way valve of the activated carbon analysis tower, is packaged by the packaging machine, and is then transferred to the loading bin. It is lifted to the loading bin by the lifting structure, and the other part enters the discharge chain from the three-way valve of the activated carbon analysis tower and returns to the semi-fixed bed adsorption tower; S5: The debris filter removes the debris brought in by unpacking and loading. The weighing level meter detects the height of the activated carbon in the bin in real time. The layered buffer plate in the chute slows down the falling speed, and the material enters the semi-fixed bed adsorption tower again through the loading chain for reaction. S6: The system operation status is monitored in real time through the bed intermittent operation control system, the intermittent flow automation of the activated carbon bed in the adsorption tower is realized, and the desulfurization and denitrification integration is completed.

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