Flue anti-bonding coupling flue gas carbon sequestration emission reduction system for electric furnace smelting process

Abstract

The invention provides a flue anti-bonding coupling flue gas carbon sequestration emission reduction system for an electric furnace smelting process, which comprises an electric furnace evaporative cooling flue, a powder preparation module, a powder spraying module and a flue spraying module, and the electric furnace evaporative cooling flue is provided with a settling chamber; the powder preparation module is used for generating adsorption powder; the powder spraying module is used for conveying the adsorption powder produced by the powder preparation module; the flue spraying module comprises a spraying main pipe arranged on the settling chamber and a plurality of spraying heads arranged on the spraying main pipe, and outlets of the spraying heads are formed in the settling chamber and face the middle of the settling chamber. According to the method, efficient adsorption of zinc steam and carbon dioxide in-situ carbon sequestration can be achieved by spraying the adsorbent powder with the high specific surface area, so that loose accumulated ash is formed, the bonding risk is reduced, the heat exchange efficiency is improved, the ash removal period is prolonged, resource utilization is facilitated, and the synergistic effects of blocking prevention, pollution suppression and carbon emission reduction are achieved.

Description

Technical Field

[0001] This invention relates to the field of electric furnace technology, and in particular to a flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes. Background Technology

[0002] Electric arc furnace (EAF) smelting processes primarily use scrap steel as raw material, typically comprising 70%–100% of the total. During high-temperature smelting, heavy metals such as zinc, lead, and cadmium in the scrap steel, due to their low boiling points (below or close to the smelting temperature), readily volatilize into gaseous elements and are discharged with the flue gas. As the EAF flue gas cools in subsequent flow channels, zinc and other metal vapors condense or oxidize below their dew point temperature, forming fine particles or liquid deposits with strong adhesion. These deposits easily accumulate on the walls of the low-temperature zone of the vaporization cooling flue, further trapping dust particles in the flue gas and forming dense build-ups. These build-ups reduce or even block the flue gas flow cross-section, increasing system pressure loss and cleaning difficulty, thus affecting continuous operation and maintenance cycles. Existing technologies struggle to effectively suppress this adhesion problem in the mid-to-low temperature sections, thereby impacting the efficient, stable, and long-term operation of the EAF flue gas system. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a flue gas anti-adhesion coupling flue gas carbon fixation and emission reduction system for electric furnace smelting process, so as to ensure the efficient, stable and long-term operation of the flue gas system of electric furnace.

[0004] The above-mentioned objective of this invention can be achieved by the following technical solution: This invention provides a flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes, comprising:

[0005] An electric furnace vaporization cooling flue, wherein a settling chamber is provided on the electric furnace vaporization cooling flue;

[0006] A powder preparation module, wherein the powder preparation module is used to generate adsorbent powder;

[0007] A powder jetting module, which is controllably connected to the powder preparation module, is used to transport the adsorbent powder produced by the powder preparation module;

[0008] A flue gas injection module is controllably connected to the powder injection module. The flue gas injection module includes a main injection pipe disposed on the settling chamber and a plurality of nozzles disposed on the main injection pipe. The outlets of the nozzles are disposed inside the settling chamber and are oriented toward the center of the settling chamber.

[0009] In a preferred embodiment of the present invention, the main spray pipe is disposed outside the settling chamber, and the outlet of the nozzle is inserted into the settling chamber.

[0010] In a preferred embodiment of the present invention, the injection main tube includes a first injection section disposed at the top of the settling chamber and / or a second injection section disposed at the side of the settling chamber.

[0011] In a preferred embodiment of the present invention, the electric furnace vaporization cooling flue includes a first cooling flue and a second cooling flue that are horizontally bent downwards. The first cooling flue is connected to the inlet of the settling chamber, and the second cooling flue is connected to the outlet of the settling chamber.

[0012] In a preferred embodiment of the present invention, the number of nozzles provided is not less than 4.

[0013] In a preferred embodiment of the present invention, the sum of the minimum cross-sectional areas of each of the nozzles is not greater than the cross-sectional area of ​​the main spray pipe.

[0014] In a preferred embodiment of the present invention, the nozzle includes a reduced diameter section connected to the main spray pipe, a throat section connected to the reduced diameter section, and an expanded diameter section connected to the throat section.

[0015] In a preferred embodiment of the present invention, the powder preparation module includes an adsorbent silo, an adsorbent powder silo, a powder preparation pipeline connecting the adsorbent silo and the adsorbent powder silo, and a pulverizing component disposed on the powder preparation pipeline.

[0016] In a preferred embodiment of the present invention, the pulverizing assembly includes a primary crushing device and a secondary grinding and grading device arranged sequentially along the conveying direction of the powder preparation pipeline.

[0017] In a preferred embodiment of the present invention, the powder injection module includes a pneumatic nozzle, the gas phase inlet of the pneumatic nozzle is used to connect to a gas source pipeline, the inlet of the pneumatic nozzle is controllably connected to the powder preparation module, the outlet of the pneumatic nozzle is controllably connected to the flue gas injection module, and a compression device is provided on the gas source pipeline.

[0018] In a preferred embodiment of the present invention, a first control valve is provided between the inlet of the pneumatic nozzle and the powder preparation module, and a second control valve is provided between the outlet of the pneumatic nozzle and the flue gas injection module.

[0019] In a preferred embodiment of the present invention, the flue gas anti-adhesion coupling flue gas carbon fixation and emission reduction system for electric furnace smelting process further includes an injection control module. The injection control module is electrically connected to the powder preparation module, the powder injection module and the flue gas injection module. The injection control module can be used to control the operating status of the powder preparation module, the powder injection module and the flue gas injection module based on the production rhythm of the electric furnace.

[0020] The technical solution of the present invention has the following significant beneficial effects:

[0021] The flue gas anti-adhesion coupled carbon fixation and emission reduction system for electric furnace smelting processes described in this invention uses a powder preparation module to pulverize raw materials into micron-sized high specific surface area powders, such as lime, dolomite, and other adsorbent raw materials with CaO or MgO as the main components. Furthermore, excess CO in the flue gas can complete the combustion process in the settling chamber, thus eliminating the need for oxygen control within the settling chamber. The dispersed phase gas source used in the powder injection module has no compositional requirements; low-temperature or ambient-temperature medium-low pressure air and purified waste flue gas can all be used as the dispersed phase. The adsorbent powder is precisely delivered and dispersed through the powder injection module and the flue gas injection module, forming a localized instantaneous cold zone in the settling chamber. This promotes the rapid adsorption and condensation of volatile heavy metals such as zinc vapor, effectively inhibiting their direct condensation and adhesion on the subsequent low-temperature flue gas wall.

[0022] Specifically, the injected CaO or MgO powder preferentially captures zinc vapor and forms loose solid composite particles. The ash deposited on the flow channel surface is mainly a physically adsorbed ash layer with low adhesion strength and loose structure, significantly reducing the risk of hard nodule formation, improving heat exchange efficiency, and extending the equipment cleaning cycle. Simultaneously, it avoids the introduction of foreign, difficult-to-treat elements, maintaining the purity of the dust composition, which is beneficial for the recycling of zinc-containing dust, preventing secondary pollution, and achieving resource-based synergistic treatment of metallurgical solid waste. Furthermore, the remaining CaO or MgO powder that does not participate in metal vapor adsorption can continue to undergo carbonization reactions with carbon dioxide during flue gas cooling, generating stable calcium carbonate and magnesium carbonate solid products, achieving in-situ chemical fixation of carbon dioxide in the flue gas, thus possessing both physical adsorption and chemical carbon fixation functions.

[0023] This invention, by setting multiple nozzles in the settling chamber of the electric furnace vaporization cooling flue, ensures that the adsorbent and flue gas are fully mixed, covering the key temperature zone of heavy metal phase transformation, comprehensively improving anti-adhesion efficiency and carbon emission reduction capabilities, and providing an integrated solution for high scrap steel ratio electric furnace smelting that "suppresses volatilization, prevents clogging, is easy to clean, and reduces carbon emissions". Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0026] Figure 1 This is a schematic diagram of a structure of an embodiment of the flue gas anti-adhesion coupling flue gas carbon fixation and emission reduction system for electric furnace smelting process according to the present invention;

[0027] Figure 2 This is a schematic diagram of the installation structure of one embodiment of the flue gas injection module described in this invention;

[0028] Figure 3 This is a schematic diagram of one embodiment of the nozzle described in this invention.

[0029] The reference numerals in the above figures are as follows:

[0030] 10. Electric furnace vaporization cooling flue; 11. First cooling flue; 12. Second cooling flue;

[0031] 20. Settling chamber;

[0032] 100. Powder preparation module; 110. Adsorbent silo; 120. Adsorbent powder silo; 130. Powder preparation pipeline; 140. Primary crushing device; 150. Secondary grinding and classification device;

[0033] 200. Powder spraying module; 210. Pneumatic nozzle; 220. Air supply pipeline; 230. Compression device; 240. First control valve; 250. Second control valve;

[0034] 300. Flue gas injection module; 310. Injection main pipe; 311. First injection section; 312. Second injection section; 320. Nozzle; 321. Reduction section; 322. Throat section; 323. Expansion section;

[0035] 400. Injection control module. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please refer to the following: Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a flue gas anti-adhesion coupling carbon fixation and emission reduction system for electric furnace smelting processes. This system includes an electric furnace vaporization cooling flue 10, a powder preparation module 100, a powder injection module 200, and a flue gas injection module 300. The electric furnace vaporization cooling flue 10 is provided with a settling chamber 20. The powder preparation module 100 is used to generate adsorbent powder. The powder injection module 200 is controllably connected to the powder preparation module 100 and is used to transport the adsorbent powder produced by the powder preparation module 100. The flue gas injection module 300 is controllably connected to the powder injection module 200 and includes a main injection pipe 310 disposed on the settling chamber 20 and multiple nozzles 320 disposed on the main injection pipe 310. The outlets of the nozzles 320 are disposed within the settling chamber 20 and face towards the center of the settling chamber 20.

[0038] Overall, in the use of this flue gas anti-adhesion coupled carbon fixation and emission reduction system for electric furnace smelting processes, the raw materials are pulverized into micron-sized high specific surface area powders through the powder preparation module 100, such as lime, dolomite, and other adsorbent raw materials with CaO or MgO as the main components. Furthermore, the excess CO in the flue gas can complete the combustion process within the settling chamber 20, therefore oxygen control is not required within the settling chamber 20. The dispersed phase gas source used by the powder injection module 200 has no compositional requirements; low-temperature or ambient-temperature medium-low pressure air and purified waste flue gas can all be used as the dispersed phase. The adsorbent powder is precisely delivered and dispersed through the powder injection module 200 and the flue gas injection module 300, forming a localized instantaneous cold zone within the settling chamber 20. This promotes the rapid adsorption and condensation of volatile heavy metals such as zinc vapor, effectively inhibiting their direct condensation and adhesion on the subsequent low-temperature flue gas wall.

[0039] Specifically, the injected CaO or MgO powder preferentially captures zinc vapor and forms loose solid composite particles. The ash deposited on the surface of the flow channel is mainly a physical adsorption type ash layer with low adhesion strength and loose structure, which significantly reduces the risk of hard nodule formation, improves heat exchange efficiency and extends the equipment cleaning cycle. At the same time, it avoids the introduction of foreign difficult-to-treat elements, keeps the dust ash pure, which is conducive to the recycling of zinc dust, prevents secondary pollution, and realizes the resource-based synergistic treatment of metallurgical solid waste.

[0040] Furthermore, the remaining CaO or MgO powder that did not participate in the adsorption of metal vapor can continue to undergo carbonization reaction with carbon dioxide during the flue gas cooling process, generating stable solid products of calcium carbonate and magnesium carbonate, thereby achieving in-situ chemical fixation of carbon dioxide in the flue gas and possessing both physical adsorption and chemical carbon fixation functions.

[0041] This invention provides an integrated solution for high scrap steel ratio electric arc furnace smelting, which is achieved by setting multiple nozzles 320 in the settling chamber 20 of the electric arc furnace vaporization cooling flue 10. This ensures that the adsorbent and flue gas are fully mixed, covering the key temperature zone of heavy metal phase transformation, and comprehensively improving the anti-adhesion efficiency and carbon emission reduction capability.

[0042] In embodiments of the present invention, such as Figure 2 In the embodiment shown, the main spray pipe 310 is disposed on the outside of the settling chamber 20, and the outlet of the nozzle 320 is inserted into the settling chamber 20.

[0043] By placing the injection main pipe 310 outside the settling chamber 20, installation, maintenance and management are facilitated, and the thermal impact of the high-temperature flue gas environment on pipe connections and control components is reduced, thereby improving the safety and service life of the equipment.

[0044] Furthermore, by inserting the outlet of the nozzle 320 into the settling chamber 20, the adsorbent can be directly delivered to the key area of ​​the flue gas flow field, ensuring that the powder is rapidly and uniformly sprayed and fully diffused in the zinc vapor phase transition temperature zone (approximately 900℃-1100℃), thereby enhancing the contact efficiency with the target pollutants.

[0045] In embodiments of the present invention, such as Figure 2 In the embodiment shown, the injection main pipe 310 includes a first injection section 311 disposed at the top of the settling chamber 20 and / or a second injection section 312 disposed at the side of the settling chamber 20.

[0046] The injection position can be flexibly configured according to the flue gas flow field distribution and zinc vapor concentration gradient to achieve multi-angle and multi-area coordinated injection, thereby forming a top-down powder diffusion zone that covers the main flue gas channel and enhances the capture effect of high-temperature steam.

[0047] Preferably, the main spray pipe 310 includes a first spray section 311 disposed at the top of the settling chamber 20 and a second spray section 312 disposed on the side of the settling chamber 20.

[0048] In one specific embodiment, such as Figure 2 In the embodiment shown, when the cross-section of the settling chamber 20 is rectangular, the first spray section 311 is horizontally arranged above the settling chamber 20, and the second spray section 312 is vertically arranged on one side of the settling chamber 20.

[0049] Furthermore, to ensure uniform spraying, two second spraying sections 312 are provided, with the two second spraying sections 312 respectively located on both sides of the settling chamber 20, thus forming a top spraying structure and a double-sided spraying structure.

[0050] The top arrangement facilitates the formation of a top-down powder diffusion zone, covering the main flue gas channel and enhancing the capture effect of high-temperature steam; the side arrangement helps to replenish the adsorbent concentration in the sidewall area and suppress local condensation and adhesion in the low-temperature area near the wall; the dual-stage synergy can significantly improve the uniformity of adsorbent distribution and response speed in complex flow fields, enhance the adaptability to fluctuating operating conditions, and ensure that efficient anti-adhesion and carbon fixation performance are maintained in different smelting stages.

[0051] In embodiments of the present invention, the designer can adjust the specific number of flue gas injection modules 300 according to usage needs, and no specific limitation is made here. Preferably, multiple flue gas injection modules 300 are arranged in parallel, and the uniformity of injection can be improved by multiple flue gas injection modules 300 working together.

[0052] In embodiments of the present invention, such as Figure 1 The embodiment shown includes a first cooling flue 11 and a second cooling flue 12 that are bent downwards horizontally. The first cooling flue 11 is connected to the inlet of the settling chamber 20, and the second cooling flue 12 is connected to the outlet of the settling chamber 20.

[0053] The first cooling flue 11 and the second cooling flue 12, which are bent downwards, together with the settling chamber 20, form a U-shaped flow channel structure. When the flue gas passes through the U-shaped flow channel structure, a sudden change in flow direction and velocity gradient are generated, which causes the dust particles and high-density particles that have adsorbed heavy metals to undergo inertial separation and gravity settling, effectively enhancing the primary dust removal efficiency for harmful components such as zinc oxide.

[0054] Furthermore, the bending design extends the residence time of flue gas in the high-temperature zone, providing a more sufficient reaction window for the adsorption reaction between the injected CaO and MgO powders and zinc vapor, improving the utilization rate of the adsorbent, and helping to form a relatively stable low-disturbance area in the settling chamber 20, avoiding the direct impact of high-speed airflow on the spray field, ensuring the retention and diffusion effect of the adsorbent cloud, and further optimizing the anti-adhesion performance and carbon fixation reaction conditions.

[0055] In embodiments of the present invention, designers can adjust the specific number and arrangement of the nozzles 320 according to usage needs, and no specific limitations are imposed here. Preferably, as Figure 2 In the illustrated embodiment, the number of nozzles 320 is not less than 4. More preferably, the plurality of nozzles 320 are arranged in a ring at equal intervals.

[0056] In an embodiment of the present invention, the sum of the minimum cross-sectional areas of each nozzle 320 is not greater than the cross-sectional area of ​​the main spray pipe 310.

[0057] By setting the minimum cross-sectional area of ​​each nozzle 320 to be no greater than the cross-sectional area of ​​the main spray pipe 310, the airflow velocity and pressure during powder conveying can be effectively guaranteed, avoiding powder blockage or gas-solid two-phase flow turbulence caused by sudden changes in flow area. This helps maintain sufficient carrier gas dynamic pressure in the main spray pipe 310, ensuring that the adsorbed powder is smoothly conveyed to each nozzle 320 and sprayed out evenly, preventing backflow or material accumulation, and improving the reliability and long-term stability of the system operation.

[0058] In one feasible embodiment of the present invention, such as Figure 3 In the embodiment shown, the nozzle 320 includes a reduced diameter section 321 connected to the main spray pipe 310, a throat section 322 connected to the reduced diameter section 321, and an expanded diameter section 323 connected to the throat section 322.

[0059] The Venturi flow channel is formed by the narrowing section 321, the throat section 322, and the widening section 323. Utilizing the principles of fluid dynamics, the Venturi flow channel accelerates the gas-solid two-phase flow as it passes through the narrowing section 321, and forms a local low-pressure negative pressure zone in the throat section 322, effectively promoting the efficient absorption of adsorbed powder from the main pipe and its full dispersion in the carrier gas. Subsequently, the velocity is reduced and the pressure is restored in the widening section 323, allowing the powder to be injected into the electric furnace vaporization cooling flue 10 in a uniform and stable state, significantly improving the mixing efficiency and reaction sufficiency of the powder with target components such as zinc vapor in the high-temperature flue gas.

[0060] Among them, the 320 material of the nozzle has high requirements for temperature resistance and thermal shock resistance. Metal materials such as 310s material can be selected, or high-temperature ceramic materials such as silicon carbide can be selected. No specific restrictions are made here.

[0061] This Venturi flow channel structure enhances self-priming and atomization without the need for additional power, improves conveying stability, avoids blockage and pulsation, and has the advantages of energy saving, reliability and fast response. It is especially suitable for metallurgical flue gas treatment environments with high temperature, high dust and continuous operation, and greatly improves the long-term operating performance of the system.

[0062] In another feasible embodiment of the present invention, the nozzle 320 includes a straight pipe section. By setting the nozzle 320 as a straight pipe section, it is beneficial to stabilize the flow pattern of the gas-solid two-phase flow, reduce local eddies and pressure losses caused by bends or constriction / expansion pipes, and ensure that the adsorbent powder maintains a uniform concentration and high kinetic energy during the conveying process.

[0063] In an embodiment of the present invention, the powder preparation module 100 includes an adsorbent silo 110, an adsorbent powder silo 120, a powder preparation pipeline 130 connecting the adsorbent silo 110 and the adsorbent powder silo 120, and a pulverizing component disposed on the powder preparation pipeline 130.

[0064] A closed-loop adsorbent processing system is constructed by the adsorbent silo 110, adsorbent powder silo 120, powder preparation pipeline 130, and pulverizing assembly. The adsorbent silo 110 stores the adsorbent to be processed, while the pulverizing assembly performs online crushing and particle size control on the raw particles stored in the silo, ensuring the generation of fine-sized powder that meets the injection requirements. This powder is then transported to the adsorbent powder silo 120 via the powder preparation pipeline 130 for temporary storage. This system achieves continuous and controllable preparation from coarse material to usable powder, significantly improving the automation and response speed of the adsorbent preparation process. It provides a reliable guarantee for subsequent efficient and stable injection and the precise capture of harmful components such as zinc vapor in flue gas.

[0065] In one specific embodiment, the pulverizing assembly includes a primary crushing device 140 and a secondary grinding and grading device 150 arranged sequentially along the conveying direction of the powder preparation pipeline 130.

[0066] The primary crushing device 140 can perform preliminary crushing of lumpy or agglomerated materials from the adsorbent silo 110, reducing particle size, alleviating the load on subsequent processing, and improving overall crushing efficiency.

[0067] Furthermore, the pre-crushed material is finely ground by the secondary grinding and grading device 150, and particle size classification is carried out simultaneously to ensure that the output powder has a uniform particle size distribution and meets the strict requirements of the spraying process for fineness, effectively improving the reaction specific surface area and collection efficiency of the adsorbent and target components such as zinc vapor in the flue gas.

[0068] Electric furnace smelting is cyclical, with each smelting session lasting approximately 30 minutes, and allows excess CO in the flue gas to complete the combustion process within the settling chamber 20. Therefore, oxygen control is not required within the settling chamber 20.

[0069] In an embodiment of the present invention, the powder spraying module 200 includes a pneumatic nozzle 210, the gas phase inlet of the pneumatic nozzle 210 is used to connect to the gas source pipeline 220, the inlet of the pneumatic nozzle 210 is controllably connected to the powder preparation module 100, the outlet of the pneumatic nozzle 210 is controllably connected to the flue gas spraying module 300, and a compression device 230 is provided on the gas source pipeline 220.

[0070] By using a pneumatic nozzle 210 as the core conveying device, its gas inlet is provided with a power airflow through a gas source pipeline 220 equipped with a compression device 230. It can utilize the existing ambient or low temperature waste flue gas in the plant area as the conveying medium to achieve controllable and stable conveying of adsorbed powder.

[0071] Furthermore, the inlet of the pneumatic nozzle 210 is controllably connected to the outlet of the powder preparation module 100, and the outlet of the pneumatic nozzle 210 is connected to the flue gas injection module 300. By adjusting the pressure and flow rate of the compression device 230, the injection rate and dispersion of the powder are precisely controlled, ensuring that high specific surface area CaO and MgO powders can be supplied as needed under different working conditions. Utilizing the gas-solid two-phase flow principle, the powder is kept in a suspended state during the conveying process to prevent pipe blockage and achieve preliminary dispersion before entering the settling chamber 20, thereby improving the mixing efficiency in the high-temperature flue gas.

[0072] In an embodiment of the present invention, a first control valve 240 is provided between the inlet of the pneumatic nozzle 210 and the powder preparation module 100, and a second control valve 250 is provided between the outlet of the pneumatic nozzle 210 and the flue gas injection module 300.

[0073] The opening and on / off state between the inlet of the pneumatic nozzle 210 and the powder preparation module 100 can be flexibly controlled by the first control valve 240, and the opening and on / off state between the outlet of the pneumatic nozzle 210 and the flue gas injection module 300 can be flexibly controlled by the second control valve 250.

[0074] In an embodiment of the present invention, the flue gas anti-adhesion coupling flue gas carbon fixation and emission reduction system for electric furnace smelting process further includes an injection control module 400. The injection control module 400 is electrically connected to the powder preparation module 100, the powder injection module 200 and the flue gas injection module 300. The injection control module 400 can be used to control the operating status of the powder preparation module 100, the powder injection module 200 and the flue gas injection module 300 based on the production rhythm of the electric furnace.

[0075] By electrically connecting the injection control module 400 to the powder preparation module 100, the powder injection module 200, and the flue gas injection module 300, the start-up, shutdown, and operating parameters of each module can be adjusted in real time based on the production rhythm of the electric furnace (such as smelting, oxidation, reduction, and tapping stages).

[0076] For example, by integrating a PLC or DCS control system, the injection control module 400 can dynamically adjust the preparation rate, delivery pressure and injection sequence of the adsorbent according to the preset process logic or the real-time monitoring signals of flue gas temperature, flow rate and zinc vapor concentration, so as to achieve precise dosing on demand and avoid resource waste and subsequent dust removal load caused by excessive injection.

[0077] Furthermore, the injection intensity is enhanced during the high-load operation of the electric furnace to ensure the efficiency of heavy metal capture in the high-temperature zone, and the injection is automatically reduced or suspended during low-emission periods, thereby improving the system's energy efficiency and economy.

[0078] The intelligent control strategy of the injection control module 400 not only enhances the system's adaptability to complex working conditions, but also effectively coordinates the synergistic effect of anti-adhesion and carbon fixation reaction, extends the cleaning cycle of the settling chamber 20 and subsequent heat exchange equipment, and improves the stability and automation level of the entire flue gas system.

[0079] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0080] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes, characterized in that, include: An electric furnace vaporization cooling flue, wherein a settling chamber is provided on the electric furnace vaporization cooling flue; A powder preparation module, wherein the powder preparation module is used to generate adsorbent powder; A powder jetting module, which is controllably connected to the powder preparation module, is used to transport the adsorbent powder produced by the powder preparation module; A flue gas injection module is controllably connected to the powder injection module. The flue gas injection module includes a main injection pipe disposed on the settling chamber and a plurality of nozzles disposed on the main injection pipe. The outlets of the nozzles are disposed inside the settling chamber and are oriented toward the center of the settling chamber.

2. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The main spray pipe is located outside the settling chamber, and the outlet of the nozzle is inserted into the settling chamber.

3. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The main spraying pipe includes a first spraying section disposed at the top of the settling chamber and / or a second spraying section disposed on the side of the settling chamber.

4. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The electric furnace vaporization cooling flue includes a first cooling flue and a second cooling flue that are horizontally bent downwards. The first cooling flue is connected to the inlet of the settling chamber, and the second cooling flue is connected to the outlet of the settling chamber.

5. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The number of nozzles is not less than 4.

6. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The sum of the minimum cross-sectional areas of all the nozzles is not greater than the cross-sectional area of ​​the main spray pipe.

7. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The nozzle includes a reduced-diameter section connected to the main spray pipe, a throat section connected to the reduced-diameter section, and an expanded-diameter section connected to the throat section.

8. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The powder preparation module includes an adsorbent silo, an adsorbent powder silo, a powder preparation pipeline connecting the adsorbent silo and the adsorbent powder silo, and a pulverizing component disposed on the powder preparation pipeline.

9. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting process as described in claim 8, characterized in that, The pulverizing assembly includes a primary crushing device and a secondary grinding and grading device arranged sequentially along the conveying direction of the powder preparation pipeline.

10. The flue gas anti-adhesion coupling system for electric furnace smelting process as described in claim 1, characterized in that, The powder injection module includes a pneumatic nozzle, the gas phase inlet of which is connected to a gas source pipeline, the inlet of which is controllably connected to the powder preparation module, and the outlet of which is controllably connected to the flue gas injection module. A compression device is provided on the gas source pipeline.

11. The flue gas anti-adhesion coupling system for electric furnace smelting process as described in claim 10, characterized in that, A first control valve is provided between the inlet of the pneumatic nozzle and the powder preparation module, and a second control valve is provided between the outlet of the pneumatic nozzle and the flue gas injection module.

12. The flue gas anti-adhesion coupling system for carbon sequestration and emission reduction in electric furnace smelting processes as described in claim 1, characterized in that, The flue gas anti-adhesion coupling system for electric arc furnace smelting process also includes an injection control module. The injection control module is electrically connected to the powder preparation module, the powder injection module and the flue gas injection module. The injection control module can be used to control the operating status of the powder preparation module, the powder injection module and the flue gas injection module based on the production rhythm of the electric arc furnace.

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