Online real-time dust and odor removal system for KR slag flue gas

Abstract

The invention provides an online real-time dust and odor removal system for KR slag flue gas. The online real-time dust and odor removal system comprises a tank cover water-fetching and dust-pumping device, a dust removal tower, a reaction tower and an exhaust system which are sequentially connected through pipelines, the tank cover water fetching and dust pumping device is used for fetching water from the high-temperature desulfurization slag and collecting desulfurization slag composite flue gas generated in the water fetching process; the dust removal tower is mainly used for reducing the particulate matter concentration of dust contained in the desulfurization slag composite flue gas; the reaction tower is mainly used for neutralizing sulfides with harmful odor in the desulfurization slag composite flue gas; and the exhaust system is used for sucking the desulfurization slag composite flue gas in the tank cover water-fetching and dust-pumping device into the chimney. According to the invention, one-time removal of composite pollutants such as solid dust and gaseous sulfide can be realized at the same time, so that a higher environmental protection standard is achieved, and preconditions are created for urban steel mills; the occupied area is small, reasonable arrangement of a KR slag treatment process and a whole steel plant is facilitated, investment is saved, and the operation cost is low; the economic and social benefits are obvious, and the popularization value is high.

Description

Technical Field

[0001] This invention relates to the field of desulfurization slag composite flue gas treatment technology, specifically to an online real-time dust removal and deodorization system for KR slag flue gas. Background Technology

[0002] There are various methods for hot metal pretreatment in steelmaking systems, among which the KR method, which offers a good overall cost-performance ratio, has been widely used. However, the slag formed after removing sulfur from hot metal using the KR method (also known as KR slag) is characterized by high sulfur content and difficulty in rapid water infiltration.

[0003] Although the steel industry has found through long-term exploration that the "drip irrigation method with tank" can effectively wet KR slag, thus solving the problem of a large amount of dust generated during the tank turning process, which seriously pollutes the plant, equipment and environment; however, there is still no effective measure to remove the sulfides such as hydrogen sulfide contained in the flue gas formed by the reaction of water with desulfurization slag at high temperature during drip irrigation with tank.

[0004] Hydrogen sulfide is a colorless, toxic gas with a rotten egg smell. Conventional dust removal facilities cannot remove hydrogen sulfide and other sulfides from flue gas. When it diffuses into the atmosphere, it not only severely pollutes the environment (forming acid rain) but also harms humans and plants. Therefore, how to achieve online continuous odor removal and "green treatment" during drip irrigation of KR slag has become a major problem that steel companies urgently need to solve. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an online real-time dust and odor removal system for KR slag flue gas, which achieves simultaneous removal of dust and sulfides in one go, thus meeting higher environmental protection standards.

[0006] To solve the above-mentioned technical problems, the present invention provides an online real-time dust removal and deodorization system for KR slag flue gas, comprising a tank cover water pumping dust removal device, a dust removal tower, a reaction tower, and an exhaust system connected in sequence by pipelines; The can lid water pumping and dust extraction device is used to pump water onto the high-temperature desulfurization slag and collect the desulfurization slag composite flue gas generated during the water pumping process. The desulfurization slag composite flue gas includes solid dust and gaseous sulfides. The dust removal tower is used to reduce the concentration of solid dust in the desulfurization slag composite flue gas, creating conditions for the subsequent reaction tower to remove gaseous sulfides. The reaction tower is used to remove gaseous sulfides from the desulfurization slag composite flue gas, and further remove solid dust, so as to achieve one-time removal of solid dust and gaseous sulfides; The exhaust system is used to draw the desulfurization residue composite flue gas from the water pumping and dust extraction device in the tank cover, which is then treated by the dust removal tower and the reaction tower before being discharged into the chimney in compliance with emission standards.

[0007] In some embodiments, multiple can lid water pumping and dust extraction devices are provided. Each can lid water pumping and dust extraction device includes a flue gas branch pipe, which is connected to a dust removal tower through a dust extraction pipe. A valve is provided on the flue gas branch pipe, and the valves on each flue gas branch pipe can be interlocked for control (the valve is open when there is a KR slag tank under the can lid water pumping and dust extraction device for drip irrigation; and the valve is closed when there is no KR slag tank under the can lid water pumping and dust extraction device for drip irrigation at a certain station, thereby ensuring the suction effect of the can lid water pumping and dust extraction device for drip irrigation at the station on the high-temperature mixed desulfurization slag composite flue gas).

[0008] In some embodiments, the dust removal tower includes a dust removal tower body, and a plurality of swirling pneumatic devices and a plurality of spray water distribution devices are arranged inside the dust removal tower body. The plurality of swirling pneumatic devices are arranged along the height direction of the dust removal tower body. Each swirling pneumatic device includes a driving device and a swirling plate. The driving device is used to drive the swirling plate to rotate along the axis of the dust removal tower body. The swirling plate is used to guide the desulfurization slag composite flue gas to rise. The plurality of spray water distribution devices are arranged one-to-one with the plurality of swirling pneumatic devices. The spray water distribution devices are arranged above the corresponding swirling pneumatic devices and are used to spray water mist onto the corresponding swirling pneumatic devices.

[0009] In some embodiments, the dust removal tower includes a dust removal water circulation system, which includes a first wastewater treatment tank. The first wastewater treatment tank is provided with a first circulation inlet and a first circulation outlet. The first circulation inlet is connected to the bottom of the dust removal tower body and is used to recycle wastewater resources at the bottom of the dust removal tower body. The first circulation outlet is connected to each spray water distribution device and is used to supply water to each spray water distribution device.

[0010] In some embodiments, a first filter plate is provided inside the first sewage treatment tank. The first filter plate is perpendicular to the bottom of the first sewage treatment tank and divides the first sewage treatment tank into a left part and a right part of the first sewage treatment tank. The first circulation inlet is located on the left side of the first sewage treatment tank, and the first circulation outlet is located on the right side of the first sewage treatment tank.

[0011] In some embodiments, a dust removal packing layer is provided inside the dust removal tower to increase the specific surface area and contact time between the dust removal water and the flue gas. The dust removal packing layer is arranged above the uppermost swirl pneumatic device. The dust removal packing layer includes multiple dust removal hollow spheres with openings on their surfaces. The dust removal hollow spheres are filled with packing material that can be used for a long time. A corresponding spray water distribution device is provided above the dust removal packing layer.

[0012] In some embodiments, the reaction tower includes a reaction tower body, within which multiple reaction packing layers and multiple spray application devices are disposed. The multiple reaction packing layers are arranged along the height of the reaction tower body. Each reaction packing layer includes multiple hollow reaction spheres with perforations on their surfaces. The hollow reaction spheres contain packing material suitable for long-term use. The multiple spray application devices are arranged one-to-one with each of the multiple reaction packing layers, positioned above the corresponding reaction packing layer, and are used to spray alkaline chemical mist onto the corresponding reaction packing layer. The reaction packing layers not only increase the specific surface area of ​​the reaction but also extend the reaction time.

[0013] In some embodiments, a demister plate is provided inside the reaction tower, and the demister plate is positioned above the uppermost reaction packing layer.

[0014] In some embodiments, the reaction tower includes a reaction liquid circulation system, which includes a second wastewater treatment tank. The second wastewater treatment tank is provided with a second circulation inlet and a second circulation outlet. The second circulation inlet is connected to the bottom of the reaction tower body for recycling wastewater resources at the bottom of the reaction tower body. The second circulation outlet is connected to each spraying and dosing device for supplying dosing agents to each spraying and dosing device. A second filter plate is provided inside the second wastewater treatment tank. The second filter plate is perpendicular to the bottom of the second wastewater treatment tank and divides the second wastewater treatment tank into a left part and a right part. The second circulation inlet is located on the left side of the second tank, and the second circulation outlet is located on the right side of the second wastewater treatment tank.

[0015] In some embodiments, a sewage system is included, which includes a sewage pipe and a sludge treatment facility. The sewage pipe includes a main sewage pipe and multiple branch sewage pipes. The multiple branch sewage pipes are respectively connected to the bottom of the dust removal tower, the bottom of the reaction tower, the bottom of the left side of the first sewage treatment tank, and the bottom of the left side of the second sewage treatment tank. The multiple branch sewage pipes are all connected to the main sewage pipe, which is connected to the sludge treatment facility.

[0016] The beneficial effects of this invention are as follows: This invention innovates a system for the two-stage treatment of desulfurization slag composite flue gas (including solid dust and gaseous sulfides) through efficient extraction, a dust removal tower, and a reaction tower. It simultaneously achieves the one-time removal of "composite pollutants" such as solid dust and toxic gases, resulting in significant environmental benefits (achieving higher emission standards). The interlocking of the water-pumping dust extraction devices and related valves at each workstation ensures effective extraction of the desulfurization slag composite flue gas, significantly reducing the environmental pollution caused by "unorganized emissions." The dust removal tower employs a combination of "multi-layer cyclone plates + spray" and "packing layer + spray," utilizing multiple mechanisms such as centrifugal force, water mist collision, interception, and diffusion agglomeration to reduce the particulate matter concentration in the flue gas from approximately 100 mg / Nm³. 3 Reduced to 20 mg / Nm 3 The following conditions create the basis for subsequent treatment in the reaction tower. The reaction tower, through the large specific surface area and extended contact time between the packing layer and the alkaline solution, not only efficiently neutralizes and removes sulfides such as sulfur dioxide and hydrogen sulfide, but also further removes fine solid dust. Ultimately, the flue gas exiting the system can simultaneously achieve a dust concentration ≤10mg / Nm³. 3 H2S concentration ≤ 5 mg / Nm 3 For the first time in the steel industry, it has achieved a higher standard of ultra-low emissions by removing "composite pollutants (solid dust + gaseous sulfides)" in one go (no pollutants + no odor).

[0017] This invention, through the interlocking of high-efficiency tank cover water pumping and dust extraction devices at each workstation with related valves, ensures the extraction effect of desulfurization slag composite flue gas while reducing the loss of dust removal suction power (reducing operating costs).

[0018] 3. This invention significantly reduces particulate matter concentration through pre-processed high-efficiency dust removal, effectively avoiding scaling and clogging problems caused by dust combining with reactants in the subsequent reaction tower.

[0019] 4. The core packing layer of the dust removal tower and reaction tower of this invention adopts the form of open-hole hollow spheres. This type of packing not only has a large specific surface area and high efficiency, but also has high mechanical strength, corrosion resistance, and is easy to replace. It can be quickly replaced when blockage occurs, resulting in low maintenance costs.

[0020] 5. The present invention provides a spray water distribution device above the dust removal packing layer, which can clean it in real time, further preventing clogging and scaling.

[0021] 6. The present invention is equipped with a dust removal water circulation system and a reaction liquid circulation system, which collect, filter, and cool (dust removal water) the dust removal water and the reaction liquid respectively and then recycle them, which greatly reduces the consumption of fresh water and reagents and lowers the operating cost.

[0022] 7. The specialized sewage discharge system of this invention collects and transports the generated sludge to the sludge treatment facility, ensuring zero discharge of sewage and sludge throughout the system, avoiding secondary pollution, and is highly environmentally friendly. It is also easy to clean regularly, reducing the intensity of manual operation and the difficulty of maintenance.

[0023] 8. This invention integrates multiple functions such as cyclone dust removal, water film dust removal, packed tower absorption, and neutralization reaction into one unit, with a small overall footprint.

[0024] 9. The multiple slag tank water drip irrigation stations of the present invention can share a single system, which is controlled by valve interlocking. This not only ensures the flexible operation of production organization, but also saves land area and a large amount of investment in redundant construction.

[0025] 10. The water tank of the present invention is equipped with a level gauge and a temperature sensor, and has an observation hole or transparent cover on the top for easy real-time monitoring of water level, water quality and temperature, and can automatically adjust the cooling system according to the water temperature to ensure that the system always operates under the best conditions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the dust removal tower of the present invention; Figure 3 This is a schematic diagram of the internal structure of the reaction tower of the present invention.

[0027] Reference numerals: 1. Water pumping and dust extraction device for tank lid; 11. Flue gas branch pipe; 12. Dust extraction pipe; 2. Dust removal tower; 21. Dust removal tower body; 22. Cyclone pneumatic device; 23. Dust removal packing layer; 24. First sewage treatment tank; 241. Left side of first sewage treatment tank; 242. Right side of first sewage treatment tank; 25. Cooling tower; 3. Reaction tower; 31. Reaction tower body; 32. Reaction packing layer; 33. Demisting plate; 34. Second sewage treatment tank; 341. Left side of second sewage treatment tank; 342. Right side of second sewage treatment tank; 4. Exhaust system; 5. Sewage system; 51. Sewage branch pipe; 52. Sewage main pipe; 6. Slag tank. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] like Figure 1As shown, this invention provides an online real-time dust and odor removal system for KR slag flue gas, comprising a tank cover water pumping and dust extraction device 1, a dust removal tower 2, a reaction tower 3, and an exhaust system 4 connected in sequence via pipelines. Together, these components constitute a "high-efficiency environmental protection system" that collects, removes, and recycles "composite pollutants" such as solid dust and gaseous sulfides in one go. The tank cover water pumping and dust extraction device 1 is used to pump water onto the high-temperature desulfurization slag and simultaneously collect the desulfurization slag composite flue gas containing solid dust and gaseous sulfides generated during the water pumping process. The dust removal tower 2 is mainly used to reduce the concentration of solid dust in the desulfurization slag composite flue gas. The reaction tower 3 is mainly used to neutralize the gaseous sulfides in the desulfurization slag composite flue gas. The exhaust system 4 is used to provide negative pressure to draw the desulfurization slag composite flue gas generated by the high-temperature desulfurization slag water pumping and drip irrigation from the tank cover water pumping and dust extraction device 1 into the chimney.

[0030] like Figure 1 As shown, slag tank 6 contains desulfurization slag. The slag tank 6 containing the high-temperature desulfurization slag is placed on a positioning base at the drip irrigation station by a crane. Multiple slag tank cover water spraying and dust extraction devices 1 can be installed according to production needs. Each slag tank cover water spraying and dust extraction device 1 corresponds to one slag tank 6 and is arranged directly above the corresponding slag tank 6. The slag tank cover water spraying and dust extraction device 1 includes a slag tank cover water spraying device and a high-efficiency dust extraction device. The slag tank cover water spraying device is an existing device. The dust extraction device includes a dust extraction hood and a flue gas branch pipe 11 connected to the dust extraction hood. The dust extraction hood is arranged directly above the slag tank 6, and the flue gas generated after water spraying is extracted through the dust extraction hood. The flue gas branch pipes 11 of each dust extraction device are connected to the dust removal tower 2 through a dust extraction pipe 12. Valves are installed on the flue gas branch pipes 11, and the valves on each flue gas branch pipe 11 are interlocked to ensure the dust extraction effect.

[0031] like Figure 2 As shown, the dust removal tower 2 includes a dust removal tower body 21. The air inlet and air outlet of the dust removal tower body 21 are respectively located near the bottom and near the top of the dust removal tower body 21. Multiple swirling pneumatic devices 22 and multiple spray water distribution devices are installed inside the dust removal tower body 21. The spray water distribution device includes multiple pipes with nozzles installed on the pipes, and the nozzles face the bottom of the dust removal tower body 21. The multiple swirling pneumatic devices 22 are arranged along the height direction of the dust removal tower body 21. Each swirling pneumatic device 22 includes a drive device and a swirling plate. The drive device is a motor used to drive the swirling plate to rotate along the axis of the dust removal tower body 21. The swirling plate is an existing mature product and is used to guide the desulfurization slag composite flue gas to rise. The multiple spray water distribution devices are arranged one-to-one with the multiple swirling pneumatic devices 22. The spray water distribution devices are arranged above the corresponding swirling pneumatic devices 22 and are used to spray water mist onto the corresponding swirling pneumatic devices 22.

[0032] The dust removal tower body 21 is also equipped with a dust removal packing layer 23, which is arranged above the uppermost cyclone pneumatic device 22. The dust removal packing layer 23 includes multiple dust removal hollow spheres with openings on the surface of the dust removal hollow spheres and packing material inside the dust removal hollow spheres. A corresponding spray water distribution device is installed above the dust removal packing layer 23.

[0033] like Figure 1 As shown, the dust removal tower 2 includes a dust removal water circulation system, which includes a first wastewater treatment tank 24. The first wastewater treatment tank 24 is provided with a first circulation inlet and a first circulation outlet. The first circulation inlet is connected to the bottom of the dust removal tower body 21 and is used to recover the wastewater resources at the bottom of the dust removal tower body 21. The first circulation outlet is connected to each spray water distribution device and is used to supply water to each spray water distribution device (when the water temperature is higher than the required value, it can be pumped to the cooling tower 25 for circulation cooling). A water pump is installed on the pipe connecting the first circulation outlet and the spray water distribution device.

[0034] like Figure 1 As shown, a first filter plate is installed inside the first sewage treatment tank 24. The first filter plate is perpendicular to the bottom of the first sewage treatment tank 24 and divides the first sewage treatment tank 24 into a left part 241 and a right part 242. A first circulation inlet is located in the left part 241 and a first circulation outlet is located in the right part 242.

[0035] Understandably, this dust removal tower 2 organically combines the dust removal characteristics of cyclone dust collectors and water film dust collectors, forming a high-efficiency smoke and dust removal principle that integrates dust removal and dust-water separation. It adopts a process of "multi-layer cyclone plates + spraying, one layer of packing + spraying" to make the gas and liquid more fully contacted, thereby achieving a high-efficiency dust removal effect.

[0036] Flue gas enters the dust removal tower 21 from the bottom through the dust extraction pipe 12. Guided by the swirl plate, it rotates and rises. The water mist sprayed by the spray water distribution device reforms into droplets ≤100μm under the action of the swirl plate. The droplets fully dissolve the particulate matter in the flue gas, greatly increasing the gas-liquid contact area. At the same time, larger dust particles are removed by the centrifugal force of the swirl plate, while smaller dust particles are agglomerated into larger dust particles due to collisions and interception by the droplets and multiple Brownian diffusions. These larger dust particles are then thrown against the tower wall and flow down, entering the first wastewater treatment tank 24 through the first circulation inlet. After being filtered by the filter plate in the first wastewater treatment tank 24, the wastewater is sprayed out again from the nozzle of the spray water distribution device through the first circulation outlet.

[0037] The concentration of particulate matter in the flue gas entering dust collector 2 is approximately 100 mg / Nm³. 3The dust collector packing layer 23 has a height of approximately 700mm. Due to its high mechanical strength, corrosion resistance, high porosity, and large specific surface area, the packing significantly improves the demisting and dust removal effect, resulting in a purified flue gas particulate matter concentration of less than 20mg / Nm³. 3 This design prevents scaling and clogging after the material enters the subsequent alkaline reaction tower 3. Furthermore, the dust collector packing layer 23 is composed of multiple hollow spheres, making it easy to replace even if clogged, and at a lower cost. In addition, a spray pipe is installed above the dust collector packing layer 23 to clean it promptly, effectively preventing scaling.

[0038] Because of the spray water distribution device, the cyclone pneumatic device 22 has both the function of a conventional cyclone plate and generates a uniform water film with a certain intensity on the tower wall, which is used to absorb the dust separated by centrifugal force and wash the tower wall of the dust removal tower 2, so that the tower wall and the bottom of the tower do not accumulate dust.

[0039] like Figure 1 As shown, since the flue gas temperature entering the dust removal tower 2 is high, it is also necessary to cool down the water in the first sewage treatment tank 24. The dust removal tower 2 includes a cooling tower 25. The inlet and outlet of the cooling tower 25 are connected to the right side 242 of the first sewage treatment tank through pipes. The water in the right side 242 of the first sewage treatment tank is pumped into the cooling tower 25 for cooling and then returned.

[0040] like Figure 3 As shown, the reaction tower 3 includes a reaction tower body 31, and multiple reaction packing layers 32 and multiple spraying and dispensing devices are arranged inside the reaction tower body 31. The multiple reaction packing layers 32 are arranged along the height direction of the reaction tower body 31. The reaction packing layer 32 includes multiple reaction hollow spheres with openings on the surface of the reaction hollow spheres and packing material inside the reaction hollow spheres. The multiple spraying and dispensing devices are arranged one-to-one with the multiple reaction packing layers 32. The spraying and dispensing devices are arranged above the corresponding reaction packing layer 32 and are used to spray alkaline chemical mist onto the corresponding reaction packing layer 32.

[0041] like Figure 3 As shown, a demister plate 33 is installed inside the reaction tower body 31, and the demister plate 33 is positioned above the uppermost reaction packing layer 32.

[0042] like Figure 1As shown, the reaction tower 3 includes a reaction liquid circulation system, which includes a second wastewater treatment tank 34. The second wastewater treatment tank 34 is provided with a second circulation inlet and a second circulation outlet. The second circulation inlet is connected to the bottom of the reaction tower body 31 and is used to recover the wastewater resources at the bottom of the reaction tower body 31. The second circulation outlet is connected to each spraying and dosing device and is used to supply dosing to each spraying and dosing device. A water pump is installed on the pipe connecting the second circulation outlet and the spraying and dosing device. A second filter plate is installed inside the second wastewater treatment tank 34. The second filter plate is perpendicular to the bottom of the second wastewater treatment tank 34 and divides the second wastewater treatment tank 34 into a left part 341 and a right part 342. The second circulation inlet is located at the left part 341 of the second wastewater treatment tank, and the second circulation outlet is located at the right part 342 of the second wastewater treatment tank.

[0043] Understandably, after the flue gas enters the reaction tower 31 through the pipe, it passes through the reaction packing layer 32, which contains alkaline chemical solution sprayed by the spraying and distributing device. During its passage through the reaction packing layer 32, the flue gas comes into full contact with the alkaline chemical solution for a neutralization reaction. The alkaline chemical solution removes acidic sulfides from the flue gas, such as sulfur dioxide and hydrogen sulfide. Simultaneously, the flue gas flows counter-currently with the sprayed chemical mist, which also removes some of the fine particulate matter in the flue gas, achieving the dual purpose of deodorization and dust removal. After being dehydrated and demisted by the demister plate 33, the flue gas is discharged into the chimney and into the atmosphere through the exhaust system 4. The chemical solution, on the other hand, circulates into the left side 341 of the second wastewater treatment tank, is filtered, and then pressurized by a water pump before being sprayed down again through the spraying and distributing device.

[0044] The tops of both the first sewage treatment tank 24 and the second sewage treatment tank 34 are made transparent or have observation holes to facilitate observation of the inside of the tanks at any time. Both the first sewage treatment tank 24 and the second sewage treatment tank 34 are equipped with level gauges to monitor the water level and facilitate timely water replenishment. The first sewage treatment tank 24 is equipped with a temperature sensor, and the water temperature can be adjusted by the cooling tower 25 according to the temperature inside the first sewage treatment tank 24.

[0045] like Figure 1As shown, the KR slag flue gas online real-time dust removal and deodorization system also includes a sewage system 5. The sewage system 5 includes a sewage pipe and a sludge treatment facility. The sewage pipe includes a main sewage pipe 52 and multiple branch sewage pipes 51. The multiple branch sewage pipes 51 are respectively connected to the bottom of the dust removal tower 21, the bottom of the reaction tower 31, the bottom of the left side 241 of the first sewage treatment tank, and the bottom of the left side 341 of the second sewage treatment tank. The multiple branch sewage pipes 51 are all connected to the main sewage pipe 52, which is connected to the sludge treatment facility. Normally, the sewage pipe is in the closed state. When a large amount of sludge accumulates at the bottom of the dust removal tower 21, and / or the bottom of the reaction tower 31, and / or the bottom of the left side 241 of the first sewage treatment tank, and / or the bottom of the left side 341 of the second sewage treatment tank, the sewage pipe is opened, and the water pump on the sewage pipe is used to pump the sludge to the sludge treatment facility for treatment, ensuring the recycling of sewage and zero discharge of sludge.

[0046] The KR slag flue gas online real-time dust removal and deodorization system of the present invention can treat high-temperature desulfurization slag composite flue gas in one go and simultaneously achieve the following: 1) The concentration of solid dust in the treated flue gas is ≤10mg / Nm3; 2) The concentration of gaseous H2S in the treated flue gas is ≤5mg / Nm3 (the treated flue gas is odorless); 3) The wastewater discharged into the steel slag water treatment system contains no harmful substances and has no odor.

[0047] The original design of the "integrated flue gas dust removal + deodorization system" of this invention has overcome the problem of "green treatment of KR slag". It not only pioneered the simultaneous realization of ultra-clean emission of KR slag composite flue gas (dust removal + deodorization) in the steel industry, creating the preconditions for "urban steel plants (steel plants can be integrated into the city in a green way)", but also has a small footprint, solved the major problems of KR slag drip irrigation treatment process and the rationality of the layout of the entire steel plant, and saved a lot of investment in the "strategic engineering project" and operating costs in the production process. It has significant economic and social benefits and has broad promotion value.

[0048] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A KR slag flue gas online real-time dust removal and odor removal system, characterized in that: It includes a tank cover water pumping and dust extraction device (1), a dust removal tower (2), a reaction tower (3), and an exhaust system (4), which are connected in sequence by pipes. The can lid water pumping and dust extraction device (1) is used to pump water onto the high-temperature desulfurization slag and collect the desulfurization slag composite flue gas generated during the water pumping process. The desulfurization slag composite flue gas includes solid dust and gaseous sulfides. The dust removal tower (2) is used to reduce the concentration of solid dust in the desulfurization slag composite flue gas, creating conditions for the subsequent reaction tower to remove gaseous sulfides; The reaction tower (3) is used to remove gaseous sulfides from the desulfurization slag composite flue gas, and at the same time further remove solid dust, so as to achieve one-time removal of solid dust and gaseous sulfides; The exhaust system (4) is used to draw the desulfurized slag composite flue gas from the tank cover water pumping dust removal device (1) through the dust removal tower (2) and the reaction tower (3) in sequence, and then discharge it into the chimney in compliance with the emission standards.

2. The KR slag flue gas online real-time dust removal and deodorization system according to claim 1, characterized in that: Multiple water pumping and dust extraction devices (1) are provided for the tank cover. Each water pumping and dust extraction device (1) includes a flue gas branch pipe (11). The flue gas branch pipe (11) is connected to the dust removal tower (2) through a dust extraction pipe (12). A valve is provided on the flue gas branch pipe (11). The valves on each flue gas branch pipe (11) are interlocked to ensure the suction effect of the water pumping and dust extraction device (1) on the desulfurization slag composite flue gas generated by the high temperature KR slag in the slag tank (6).

3. The KR slag flue gas online real-time dust removal and deodorization system according to claim 1, characterized in that: The dust removal tower (2) includes a dust removal tower body (21). Multiple swirling pneumatic devices (22) and multiple spray water distribution devices are installed inside the dust removal tower body (21). The multiple swirling pneumatic devices (22) are arranged along the height direction of the dust removal tower body (21). Each swirling pneumatic device (22) includes a driving device and a swirling plate. The driving device is used to drive the swirling plate to rotate along the axis of the dust removal tower body (21). The swirling plate is used to guide the desulfurization slag composite flue gas to rise. The multiple spray water distribution devices are arranged one-to-one with the multiple swirling pneumatic devices (22). The spray water distribution devices are arranged above the corresponding swirling pneumatic devices (22) and are used to spray water mist onto the corresponding swirling pneumatic devices (22).

4. The KR slag flue gas online real-time dust removal and deodorization system according to claim 3, characterized in that: The dust removal tower (2) includes a dust removal water circulation system, which includes a first sewage treatment tank (24). The first sewage treatment tank (24) is provided with a first circulation inlet and a first circulation outlet. The first circulation inlet is connected to the bottom of the dust removal tower body (21) and is used to recover the sewage resources at the bottom of the dust removal tower body (21). The first circulation outlet is connected to each spray water distribution device and is used to supply water to each spray water distribution device.

5. The KR slag flue gas online real-time dust removal and deodorization system according to claim 4, characterized in that: The first wastewater treatment tank (24) is provided with a first filter plate, which is perpendicular to the bottom of the first wastewater treatment tank (24). The first filter plate divides the first wastewater treatment tank (24) into a left part (241) and a right part (242). The first circulation inlet is located in the left part (241) and the first circulation outlet is located in the right part (242).

6. The KR slag flue gas online real-time dust removal and deodorization system according to claim 3, characterized in that: The dust removal tower body (21) is provided with a dust removal packing layer (23), which is arranged above the uppermost swirl pneumatic device (22). The dust removal packing layer (23) includes multiple dust removal hollow spheres with openings on the surface of the dust removal hollow spheres and packing material inside the dust removal hollow spheres. A corresponding spray water distribution device is provided above the dust removal packing layer (23).

7. The KR slag flue gas online real-time dust removal and deodorization system according to claim 5, characterized in that: The reaction tower (3) includes a reaction tower body (31), and multiple reaction packing layers (32) and multiple spraying and dispensing devices are provided inside the reaction tower body (31). The multiple reaction packing layers (32) are arranged along the height direction of the reaction tower body (31). The reaction packing layer (32) includes multiple reaction hollow spheres. The surface of the reaction hollow spheres is perforated, and the reaction hollow spheres are filled with packing. The multiple spraying and dispensing devices are arranged one-to-one with the multiple reaction packing layers (32). The spraying and dispensing devices are arranged above the corresponding reaction packing layer (32) and are used to spray alkaline drug mist onto the corresponding reaction packing layer (32).

8. The KR slag flue gas online real-time dust removal and deodorization system according to claim 7, characterized in that: The reaction tower body (31) is equipped with a demister plate (33), which is located above the uppermost reaction packing layer (32).

9. The KR slag flue gas online real-time dust removal and odor removal system according to claim 7, characterized in that: The reaction tower (3) includes a reaction liquid circulation system, which includes a second wastewater treatment tank (34). The second wastewater treatment tank (34) is provided with a second circulation inlet and a second circulation outlet. The second circulation inlet is connected to the bottom of the reaction tower body (31) and is used to recover the wastewater resources at the bottom of the reaction tower body (31). The second circulation outlet is connected to each spraying and dosing device and is used to supply medicine to each spraying and dosing device. A second filter plate is provided inside the second wastewater treatment tank (34). The second filter plate is perpendicular to the bottom of the second tank (34). The second filter plate divides the second wastewater treatment tank (34) into a left part (341) and a right part (342). The second circulation inlet is located in the left part (341) of the second wastewater treatment tank, and the second circulation outlet is located in the right part (342) of the second wastewater treatment tank.

10. The KR slag flue gas online real-time dust removal and deodorization system according to claim 9, characterized in that: The system includes a sewage system (5), which includes a sewage pipe and a sludge treatment facility. The sewage pipe includes a main sewage pipe (52) and multiple branch sewage pipes (51). The multiple branch sewage pipes (51) are respectively connected to the bottom of the dust removal tower (21), the bottom of the reaction tower (31), the bottom of the left side (241) of the first sewage treatment tank, and the bottom of the left side (341) of the second sewage treatment tank. The multiple branch sewage pipes (51) are all connected to the main sewage pipe (52), which is connected to the sludge treatment facility.

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