Recycling device for primary dedusting coarse ash of converter

Abstract

The utility model relates to the technical field of steel smelting and resource recovery, and provides a converter primary dust removal coarse ash recycling device which comprises a cooling tank body, a cooling cavity is formed in the cooling tank body, an ash hopper communicated with the cooling cavity is arranged at the bottom of the cooling tank body, an ash outlet is formed in the bottom of the ash hopper, and the ash hopper is used for collecting coarse ash. Coarse ash is discharged through the ash outlet; a gas outlet is further formed in the ash hopper, a blanking grating is arranged in the ash hopper, the interior of the ash hopper is divided into an air flow channel and an ash falling cavity by the blanking grating, a plurality of air blocking partition plates are arranged on the blanking grating, an ash passing gap is formed between every two adjacent air blocking partition plates, and the air flow channel is communicated with the ash falling cavity through the ash passing gaps. By means of the technical scheme, the technical problems that in the prior art, due to the fact that vortex is formed in the ash hopper of the evaporative cooler in a converter steelmaking primary dust removal system due to the uneven flue gas flow speed, coarse ash is secondarily entrained, the coarse ash recycling rate is low, and the system operation stability is poor are solved.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel smelting and resource recycling technology, specifically to a device for recycling coarse ash from primary dust removal in converters. Background Technology

[0002] In the primary dust removal system of converter steelmaking, the evaporative cooler, as a core piece of equipment, plays a crucial role in cooling high-temperature flue gas and initially separating coarse ash (which has a high iron content and is worth recycling). The initial design of the conical section of the ash hopper at its bottom was to utilize gravity to settle the coarse ash, but existing technology has significant drawbacks: Firstly, the uneven distribution of flue gas velocity within the cooler creates a vortex effect in the conical section of the ash hopper. This vortex re-entrains settled coarse ash into the flue gas, resulting in low coarse ash collection efficiency, with a large amount of insufficiently separated coarse ash entering subsequent processing equipment. Secondly, components such as CaO in the coarse ash are prone to absorbing moisture and agglomerating, forming "ash nodules" at the bottom of the ash hopper. These nodules not only hinder the normal sliding of coarse ash but also further exacerbate vortex disturbances, even forcing equipment shutdown for manual cleaning, significantly increasing operation and maintenance costs. Furthermore, the pressure fluctuations inside the cooler caused by the vortex affect the stable operation of supporting equipment such as fans; while the continuous scouring of the inner wall of the ash hopper by high-speed ash particles accelerates equipment wear, leading to frequent replacement of wear-resistant parts. The aforementioned defects create a cycle that not only leads to low recycling rates of coarse ash and waste of iron resources, but also increases the load on subsequent dust removal equipment and raises system energy consumption, resulting in insufficient recycling efficiency of converter coarse ash. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a recycling device for coarse ash from the primary dust removal of converters, which solves the technical problems in the prior art where the uneven flue gas velocity in the evaporator cooler ash hopper of the primary dust removal system of converter steelmaking causes secondary entrainment of coarse ash, resulting in low coarse ash recycling rate and poor system operation stability.

[0004] According to one aspect, at least one embodiment of the present invention provides a device for recycling coarse ash from a converter primary dust collector, comprising:

[0005] A cooling tank body has a cooling chamber inside. The bottom of the cooling tank body is provided with an ash hopper that communicates with the cooling chamber. The bottom of the ash hopper has an ash outlet. The ash hopper is used to collect coarse ash and discharge it through the ash outlet. The ash hopper is also provided with a gas outlet for discharging the gas after the coarse ash has been removed.

[0006] The ash hopper is equipped with a material discharge grid, which divides the ash hopper into an airflow channel and an ash discharge chamber. The cooling chamber, the airflow channel, and the gas outlet are connected in sequence to form a gas flow path. The material discharge grid is equipped with several wind baffles, and a ash passage gap is formed between two adjacent wind baffles. The airflow channel and the ash discharge chamber are connected through the ash passage gap.

[0007] For example, in at least one embodiment of this disclosure, a device for recycling coarse ash from a converter primary dust collector is provided, wherein the ash hopper is an inverted conical hopper with a cross-sectional area that gradually decreases from top to bottom, the gas outlet is connected to the top of the ash hopper, and the ash outlet is located at the bottom of the ash hopper.

[0008] For example, at least one embodiment of the present disclosure provides a device for recycling coarse ash from a converter primary dust collector. The material discharge grid has a bottom edge and two ash guiding inclined edges are respectively provided on both sides of the bottom edge. The ash guiding inclined edges are inclined in the same direction as the inclined inner wall of the ash hopper. The bottom edge is provided with a centralized ash discharge hole, which is used to collect coarse ash and discharge it into the ash discharge chamber through the centralized ash discharge hole.

[0009] For example, in at least one embodiment of the present disclosure, a device for recycling coarse ash from a converter primary dust removal process is provided in which the baffles are arranged sequentially along the direction of gas flow in the airflow channel, and the angle between the baffles and the horizontal direction along the gas flow direction gradually increases, so that the gas flow direction and the extension direction of the ash passage gap always form an angle.

[0010] For example, the converter primary dust collection coarse ash recycling device provided in at least one embodiment of this disclosure further includes:

[0011] The first rotating separator is rotatably disposed in the centralized dust collection hole via a rotating shaft. The rotation direction of the first rotating separator is the same as the gas flow direction. The first rotating separator is provided with a plurality of first flaps along the circumference of the rotating shaft. The first rotating separator is configured such that after being rotated by the airflow, it drives the first flaps to block or unblock the centralized dust collection hole.

[0012] For example, the converter primary dust collection coarse ash recycling device provided in at least one embodiment of this disclosure further includes:

[0013] The second rotating separator is arranged in the centralized ash discharge hole, rotating synchronously and in the same direction as the first rotating separator. The second rotating separator is provided with a second flap, the first flap is provided with a first comb tooth, and the second flap is provided with a second comb tooth. The first rotating separator and the second rotating separator are configured to rotate when driven by airflow, and the first comb tooth and the second comb tooth rotate in a staggered manner to agitate the coarse ash and cause the coarse ash to enter the ash discharge chamber under the rotation of the first comb tooth and the second comb tooth.

[0014] For example, the converter primary dust collection coarse ash recycling device provided in at least one embodiment of this disclosure further includes:

[0015] A bucket elevator is provided with a lifting inlet and an ash outlet connected to the lifting inlet. The bucket elevator is used to lift and transport coarse ash discharged from the ash outlet upwards.

[0016] For example, at least one embodiment of this disclosure provides a device for recycling coarse ash from a converter primary dust removal process, wherein the top of the bucket elevator is provided with an elevator outlet and an intermediate ash collection bin, and the elevator outlet leads to the intermediate ash collection bin.

[0017] For example, at least one embodiment of this disclosure provides a device for recycling coarse ash from a converter primary dust removal process, wherein a flap valve is provided in the ash outlet for closing or opening the ash outlet.

[0018] For example, at least one embodiment of this disclosure provides a device for recycling coarse ash from a converter primary dust collector, wherein the intermediate ash collection silo is equipped with a weighing device for weighing the weight of the coarse ash in the ash collection silo.

[0019] The beneficial effects of the embodiments of this utility model are as follows:

[0020] In this invention, the material discharge grid divides the ash hopper into independent airflow channels and ash collection chambers. This physical spatial separation prevents secondary entrainment of coarse ash by eddies, effectively separating the flue gas flow area from the coarse ash settling area. The baffles alter the airflow field within the airflow channels, using their structure to block high-speed airflow from directly impacting the ash collection area. This reduces the kinetic energy of the gas near the ash passage gap, ensuring that the aerodynamic force on coarse ash particles is less than their gravitational force, allowing them to fall smoothly through the ash passage gap along the surface of the material discharge grid. The guide channel formed by adjacent baffles directs the flue gas flow uniformly, preventing the formation of local eddies and thus improving coarse ash collection efficiency. The structural design of the ash passage gap allows coarse ash particles to pass freely while restricting flue gas entry into the ash collection chamber, reducing disturbance in the gas-solid two-phase flow within the chamber and lowering the probability of coarse ash agglomeration. The stable airflow field reduces pressure fluctuations inside the cooling tank, minimizing alternating stress on fans and other equipment, and extending equipment lifespan. The baffles' blocking effect on high-speed ash particles reduces direct scouring of the ash hopper's inner wall, decreasing equipment wear. The above structures work together to form an efficient gas-solid separation path, which not only ensures the smooth collection of coarse ash but also improves the stability of system operation. This fundamentally solves the problems of eddy current disturbance, coarse ash entrainment, and equipment wear in existing technologies, and achieves a significant improvement in the recycling rate of converter coarse ash. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the device for recycling coarse ash from the primary dust removal of a converter in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the internal structure of the ash hopper in the embodiment (f is the airflow direction);

[0024] Figure 3 for Figure 2 A partially enlarged structural diagram of section A in the middle (f represents the airflow direction);

[0025] Figure 4 for Figure 2 A partially enlarged structural diagram of section B in the middle (f represents the airflow direction);

[0026] In the diagram: Cooling tank-1, Cooling chamber-101, Ash hopper-2, Ash outlet-201, Gas outlet-202, Airflow channel-203, Ash drop chamber-204, Material drop grid-3, Bottom edge-301, Ash guide bevel-302, Centralized ash drop hole-303, Wind baffle-4, Ash passage gap-401, First rotating separator-5, Rotating shaft-501, First flap-6, First comb tooth section-601, Second rotating separator-7, Second flap-8, Second comb tooth section-801, Bucket elevator-9, Lifting inlet-901, Lifting outlet-902, Intermediate ash collection bin-903. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0028] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0029] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] like Figures 1-4 As shown, this invention illustrates a device for recycling coarse ash from a converter primary dust collector in one embodiment. The cooling chamber 101 inside the cooling tank 1 is used to contain and cool high-temperature flue gas. The bottom of the tank is connected to an ash hopper 2 with a conical structure. A horizontally arranged feed grid 3 forms a horizontal dividing surface inside the ash hopper 2, separating it into an upper airflow channel 203 and a lower ash collection chamber 204. Several baffles 4 are vertically fixed on the feed grid 3, spaced apart along the length of the feed grid 3. A gap 401 is left between the bottom edge of adjacent baffles 4 and the feed grid 3, serving as a connection path between the airflow channel 203 and the ash collection chamber 204. The flue gas in the cooling chamber 101 flows through the airflow channel 203 above the feed grid 3 to the gas outlet 202. Coarse ash particles, under gravity, fall through the gap 401 into the lower ash collection chamber 204 and are discharged through the ash outlet 201. The height direction of the windbreak baffle 4 is consistent with the direction of the generatrix of the cone surface of the ash hopper 2, and its plate surface forms an obtuse angle with the flue gas flow direction, thus forming a flow guiding structure for the airflow.

[0034] The feed grid 3 divides the ash hopper 2 into independent airflow channels 203 and ash collection chambers 204. This physical spatial separation prevents secondary entrainment of coarse ash by eddies, thus separating the flue gas flow area from the coarse ash settling area. The baffle 4 alters the airflow field within the airflow channels 203, using its structure to block high-speed airflow from directly impacting the ash collection area. This reduces the kinetic energy of the gas near the ash passage gap 401, ensuring that the aerodynamic force on the coarse ash particles is less than their weight, allowing them to fall smoothly through the ash passage gap 401 along the surface of the feed grid 3. The guide channel formed by adjacent baffles 4 guides the flue gas to flow uniformly, preventing the formation of local eddies and improving coarse ash collection efficiency. The structural design of the ash passage gap 401 allows coarse ash particles to pass freely while restricting flue gas entry into the ash collection chamber 204, reducing disturbance in the gas-solid two-phase flow within the chamber and lowering the probability of coarse ash agglomeration. The stable airflow field reduces pressure fluctuations inside the cooling tank 1, minimizing alternating stress on fans and other equipment, and extending equipment lifespan. The baffle plate 4 reduces the direct scouring of the inner wall of the ash hopper 2 by blocking high-speed ash particles, thus reducing equipment wear. The above structures work together to form an efficient gas-solid separation path, ensuring smooth collection of coarse ash and improving system operational stability. This fundamentally solves problems such as eddy current disturbance, coarse ash entrainment, and equipment wear in existing technologies, achieving a significant improvement in the recycling rate of converter coarse ash.

[0035] In some examples, the ash hopper 2 has an inverted frustum-shaped structure, with its inner wall gradually converging downwards from the bottom connection of the cooling tank 1 towards the center, forming an inverted cone-shaped hopper with a decreasing cross-sectional area from top to bottom. The gas outlet 202 is located at the top edge of the ash hopper 2 and connects to the airflow channel 203 inside the ash hopper 2, used to guide the gas after the removal of coarse ash to be discharged upwards; the ash outlet 201 is located at the bottom center of the ash hopper 2 and connects to the ash collection chamber 204, used to discharge the settled coarse ash downwards. The inclination angle of the inner wall of the inverted cone-shaped hopper matches the ash guiding structure of the discharge grid 3, causing coarse ash particles to converge towards the bottom along the hopper wall under gravity. Simultaneously, the flue gas in the airflow channel 203 flows along the gas outlet 202 at the upper edge of the hopper, forming a separation guide path for the gas-solid two-phase flow.

[0036] The inverted conical structure of the ash hopper 2 utilizes the gradual change in cross-sectional area to gradually increase the flue gas velocity within the airflow channel 203 as the cross-section contracts, preventing the formation of vortices caused by abrupt changes in cross-section. Combined with the physical separation effect of the material discharge grid 3, this effectively blocks airflow disturbance to the ash discharge chamber 204. The gas outlet 202 is located at the top, guiding the flue gas to flow smoothly out along the upper edge of the ash hopper 2, reducing airflow stagnation and swirling at the bottom of the hopper, and lowering the risk of secondary entrainment of settled coarse ash. The ash outlet 201 is located at the bottom center, allowing coarse ash to naturally converge towards the lowest point of the hopper under gravity, shortening the residence time of coarse ash within the hopper. Combined with the ash discharge path of the ash passage gap 401, this forms a smooth gas-solid separation channel with "air outlet at the top and ash discharge at the bottom." This structural design, through geometric optimization, enhances the driving force of gravity settling and reduces the mutual interference between gas and solid two-phase flows. This not only improves the efficiency of coarse ash collection but also reduces the scouring and wear on the inner wall of the ash hopper 2. At the same time, it provides stable flow field conditions for the gas-solid separation function of the subsequent discharge grid 3 and windbreak baffle 4. From a structural perspective, it solves the problems of coarse ash entrainment and equipment wear caused by eddies in the existing technology.

[0037] In some examples, the material discharge grid 3 spans the interior of the ash hopper 2, with its bottom edge 301 horizontally positioned in the middle of the ash hopper 2, and symmetrically extending guide slopes 302 on both sides. The guide slopes 302 are parallel to the inclined inner wall of the ash hopper 2, forming a guide slope structure that gradually narrows from top to bottom. A centralized ash discharge hole 303 is provided in the center of the bottom edge 301, which communicates with the ash discharge chamber 204 below. Coarse ash entering the ash hopper 2 from the cooling chamber 101 slides and converges along the guide slopes 302 towards the bottom edge 301 under the action of gravity, and finally falls into the ash discharge chamber 204 through the centralized ash discharge hole 303, completing the centralized collection of coarse ash. The wind baffle 4 is vertically fixed to the upper surface of the material discharge grid 3, which, while guiding the airflow, does not affect the sliding and convergence of coarse ash on the surface of the material discharge grid 3.

[0038] The inclined side 302 of the ash guide, with the same inclination direction as the inner wall of the ash hopper 2, creates a continuous ash guiding path. Gravity enhances the sliding tendency of the coarse ash, allowing it to quickly concentrate towards the bottom edge 301, reducing its residence time on the discharge grid 3 and avoiding the risk of blockage due to accumulation. The concentrated ash discharge hole 303, located at the bottom edge 301, gathers the dispersed coarse ash into a concentrated ash flow. Combined with the inverted conical structure of the ash hopper 2, this forms a vertically efficient ash discharge channel, further improving the settling efficiency of the coarse ash. This structural design, in conjunction with the shape of the ash hopper 2, reduces airflow interference during the coarse ash descent, preventing settled coarse ash from being re-entrained by the airflow. Simultaneously, it stabilizes the airflow field within the airflow channel 203, providing conditions for the baffle plate 4 to effectively guide the flue gas, thereby reducing the probability of eddy formation, reducing equipment wear, and improving the gas-solid separation performance and operational stability of the entire device from a structural optimization perspective.

[0039] In some examples, within the airflow channel 203, multiple baffles 4 are arranged sequentially along the flue gas flow direction, from the cooling chamber 101 to the gas outlet 202. The first baffle 4 is set at an angle α to the horizontal direction, and the angles between the subsequent baffles 4 and the horizontal direction increase sequentially to β, γ, etc., along the airflow direction, forming a gradually opening guide structure. A ash passage gap 401 is formed between the bottom edge of adjacent baffles 4 and the upper surface of the material drop grid 3, and the extension direction of each ash passage gap 401 maintains an angle θ with the airflow direction at the corresponding position. When the flue gas enters the airflow channel 203, it passes through the guide effect of each baffle 4 in sequence, and the airflow direction gradually shifts upward as the angle increases, while coarse ash particles fall into the ash drop chamber 204 through the ash passage gap 401 under the action of gravity, achieving gas-solid separation.

[0040] The gradually opening angle design of the baffle plate 4 extends the separation distance between the gas and solid phases, increasing the chance of coarse ash settling. By maintaining a non-parallel angle between the gas flow direction and the ash passage gap 401, the high-speed airflow is prevented from directly scouring the ash passage gap 401, reducing the risk of secondary entrainment of settled coarse ash. As the angle increases, the upward velocity component of the flue gas in the airflow channel 203 gradually increases, allowing the flue gas to be guided to the gas outlet 202 more quickly, reducing the probability of bottom vortex formation. At the same time, the stable guiding path reduces system pressure fluctuations, protecting downstream fan equipment. This structure works synergistically with the ash-guiding inclined edge 302 of the discharge grid 3; the former optimizes the airflow path, while the latter enhances coarse ash collection, jointly improving the separation efficiency and operational stability of the device, and reducing equipment wear and maintenance costs.

[0041] In some examples, the first rotating separator 5 is installed at the opening of the centralized ash discharge hole 303 via a horizontally arranged rotating shaft 501. Both ends of the rotating shaft 501 are fixedly connected to the bottom edge 301 of the discharge grid 3, allowing the first rotating separator 5 to rotate around the rotating shaft 501 in a vertical plane. The rotation direction is consistent with the gas flow direction in the airflow channel 203, i.e., from the cooling tank 1 towards the gas outlet 202. Several first flaps 6 are evenly distributed circumferentially on the circular base plate of the first rotating separator 5. Each first flap 6 is perpendicular to the base plate, forming a shielding structure that can rotate synchronously with the base plate. When the flue gas flows in the airflow channel 203, the airflow pushes the first flaps 6, causing the base plate to rotate around the rotating shaft 501, causing the first flaps 6 to periodically rotate to directly above or to the side of the centralized ash discharge hole 303, achieving intermittent shielding and opening of the centralized ash discharge hole 303.

[0042] The first rotating separator 5 utilizes the kinetic energy of the flue gas flow as its driving force, achieving autonomous rotation without the need for an additional power device. Through the periodic action of the first flap 6, the continuous ash falling process is transformed into an intermittent ash falling process: when the first flap 6 rotates above the centralized ash falling hole 303, it temporarily blocks the fall of coarse ash, preventing a large amount of coarse ash from accumulating and clogging the hole in a short period of time; when the first flap 6 rotates to the side, the centralized ash falling hole 303 opens, allowing the coarse ash to fall into the ash falling chamber 204 under the action of gravity. This intermittent ash falling mechanism effectively controls the falling speed of coarse ash, preventing the hole from being blocked due to excessively rapid ash falling, while reducing the probability of airflow entering the ash falling chamber 204 through the centralized ash falling hole 303, thus reducing the disturbance of the airflow to the coarse ash in the ash falling chamber. This structure works in conjunction with the guide ash slope 302 and the centralized ash discharge hole 303 of the discharge grid 3. While achieving coarse ash collection, it avoids mutual interference between gas and solid two-phase flows through dynamic separation. In particular, it addresses the clogging problem caused by CaO components in coarse ash absorbing moisture and agglomerating. The mechanical rotation breaks the initial agglomeration tendency, improves the reliability of the ash discharge system, reduces the frequency of manual ash cleaning, and lowers operation and maintenance costs.

[0043] In some examples, within the centralized ash collection hole 303, the second rotating separator 7 and the first rotating separator 5 are coaxially mounted via the same rotating shaft 501, and their rotation directions and angular velocities are consistent. A second flap 8 is vertically arranged on the circular base plate of the second rotating separator 7, with the same number of flaps as the first flap 6 and corresponding circumferential positions. A first comb tooth 601 extends from the side of the first flap 6 facing the second flap 8, and a second comb tooth 801 extends from the corresponding side of the second flap 8. The tooth shapes of the two sets of comb teeth are mutually compatible, and the tooth spacing is equal. When the airflow within the airflow channel 203 pushes the first rotating separator 5 and the second rotating separator 7 to rotate synchronously, the first comb tooth 601 and the second comb tooth 801 rotate periodically in a staggered state, forming an interlaced stirring area above the centralized ash collection hole 303. This breaks up and pushes the coarse ash accumulated on the bottom edge 301 of the discharge grid 3, causing the coarse ash to fall through the centralized ash collection hole 303 into the ash collection chamber 204.

[0044] The synchronous staggered rotation structure of the second rotating separator 7 and the first rotating separator 5 utilizes the mechanical movement of the comb teeth to actively process the coarse ash. On one hand, the interlaced comb teeth effectively break up the clumps formed by CaO moisture absorption in the coarse ash, preventing clumps from clogging the centralized ash discharge hole 303. On the other hand, the thrust generated by the rotation of the comb teeth helps the coarse ash overcome its own friction and adhesion, accelerating its fall through the centralized ash discharge hole 303 and improving ash discharge efficiency. This structure works synergistically with the intermittent shielding function of the first rotating separator 5. The intermittent ash discharge process provides sufficient processing time for the comb teeth to agitate, while the breaking and pushing action of the comb teeth ensures the smoothness of each ash discharge. The two work together to prevent coarse ash accumulation and blockage, and reduce airflow interference to the ash discharge chamber 204. In addition, this structure also uses flue gas kinetic energy as the driving force, requiring no additional power, reducing equipment energy consumption, and reducing the frequency of manual intervention, significantly improving the automation level and operational stability of the converter coarse ash recycling device.

[0045] In some examples, the bucket elevator 9 is vertically positioned below the ash outlet 201 of the ash hopper 2. Its inlet 901 is connected to the outlet 201 via a sealed pipe, forming a coarse ash conveying channel. The bucket elevator 9 has a vertically extending lifting chain with multiple buckets evenly distributed along it. As the buckets circulate with the chain, they receive the coarse ash discharged from the outlet 201 through the inlet 901. When the buckets move upwards with the chain to the top of the bucket elevator 9, a tipping mechanism flips them, discharging the coarse ash to subsequent conveying equipment. During the lifting process, the outer shell of the bucket elevator 9 forms a closed conveying space, preventing coarse ash from scattering and causing environmental pollution. The bucket elevator 9 enables the vertical conveying of coarse ash from the lower outlet 201 to the higher processing equipment, overcoming the limitations of traditional horizontal conveying methods that require multiple stages of equipment transfer, shortening the conveying path, and reducing scattering losses during coarse ash conveying. The sealed conveyor structure effectively prevents the leakage of dust-laden gas, improves the working environment, and reduces the waste of iron resources. This structure, together with the discharge grid 3, the first rotating separator 5, and the second rotating separator 7, forms a complete coarse ash processing chain.

[0046] In some examples, the bucket elevator 9 has a top lifting outlet 902, which connects to the internal lifting channel of the bucket elevator 9 to discharge the coarse ash conveyed to the top by the buckets. An intermediate ash collection silo 903 is located on one side of the top of the bucket elevator 9, with its top inlet sealed to the lifting outlet 902 via a guide pipe, forming a continuous conveying path for the coarse ash. When the buckets in the bucket elevator 9 carrying coarse ash reach the top, the buckets overturn, causing the coarse ash to fall through the lifting outlet 902 into the intermediate ash collection silo 903. The inner wall of the intermediate ash collection silo 903 has a vertical cylindrical structure, and the bottom has a discharge channel connected to subsequent processing equipment, realizing the temporary storage and transfer of coarse ash.

[0047] In some examples, a flap valve is installed inside the ash outlet 201. This flap valve includes a valve plate, a hinge shaft, and a counterweight structure. The valve plate is horizontally mounted to the inner wall of the ash outlet 201 via the hinge shaft and can rotate in a vertical plane around the hinge shaft to control the opening and closing of the ash outlet 201. The counterweight structure is fixed to one side of the valve plate, and its gravity keeps the valve plate closed in the absence of external force, preventing coarse ash from falling on its own. When the coarse ash in the ash chamber 204 accumulates to a preset weight, the pressure of the coarse ash on the valve plate overcomes the gravitational torque of the counterweight structure, pushing the valve plate downwards and opening the ash outlet 201, allowing the coarse ash to be discharged under gravity. When the weight of the coarse ash decreases to a certain level, the gravity of the counterweight structure causes the valve plate to automatically reset, and the ash outlet 201 closes.

[0048] The gravity-driven structure of the flap valve enables automatic opening and closing control of the ash outlet 201, eliminating the need for an external power source and reducing system energy consumption and control complexity. In the closed state, the valve plate tightly adheres to the inner wall of the ash outlet 201, effectively preventing backflow of outside air into the ash hopper 2. This avoids a sudden drop in flue gas temperature and water vapor condensation caused by cold air mixing, fundamentally reducing the environmental conditions for CaO in the coarse ash to absorb moisture and agglomerate. During opening, the flap valve's flipping motion mechanically disturbs the accumulated coarse ash, breaking up minor agglomerates and ensuring smooth ash discharge.

[0049] In some examples, the top of the intermediate ash collection silo 903 is suspended from the support frame by an elastic support structure, and the bottom discharge port is connected to the subsequent processing equipment through a flexible connecting pipe, forming an independent weighing unit. The weighing equipment uses a pressure sensor array, evenly distributed at the connection interface between the elastic support structure and the support frame, to monitor the gravity changes of the intermediate ash collection silo 903 in real time. When the bucket elevator 9 conveys coarse ash to the intermediate ash collection silo 903 through the lifting outlet 902, the weighing equipment converts the real-time weight data into an electrical signal output; when the coarse ash is discharged through the bottom discharge port, the weighing equipment simultaneously records the weight reduction value. By comparing the rate of weight change with a preset threshold, the feeding and discharging status of the intermediate ash collection silo 903 and the internal coarse ash storage volume can be determined. The weighing equipment enables real-time monitoring of the coarse ash weight within the intermediate ash collection silo 903, providing accurate material balance data for the entire recycling system. By calculating the weight difference between the feed and discharge, the amount of coarse ash recovered can be precisely tallied, providing data support for material management in converter steelmaking. When abnormal weight changes are detected, such as a sudden decrease in the feed rate or a continuous increase in weight due to poor discharge, the system can promptly issue an alarm, prompting operators to check the bucket elevator 9 or subsequent processing equipment for malfunctions, preventing coarse ash accumulation or system blockage caused by equipment problems. This structure works in conjunction with the buffer function of the intermediate ash collection silo 903, dynamically adjusting the feeding and discharging rhythm based on weight data: when the intermediate ash collection silo 903 is close to full load, the conveying speed of the bucket elevator 9 can be automatically reduced or feeding can be paused, prioritizing the processing of coarse ash within the silo; when the weight is below a preset value, the feeding speed is increased to ensure continuous supply to subsequent processes.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for recycling coarse ash from a converter primary dust collector, characterized in that, include: A cooling tank (1) is provided, with a cooling chamber (101) inside the cooling tank (1). A hopper (2) communicating with the cooling chamber (101) is provided at the bottom of the cooling tank (1). The hopper (2) has an ash outlet (201) at the bottom. The hopper (2) is used to collect coarse ash and discharge the coarse ash through the ash outlet (201). The hopper (2) is also provided with a gas outlet (202) for discharging the gas after removing the coarse ash. The ash hopper (2) is provided with a material discharge grid (3), which divides the ash hopper (2) into an airflow channel (203) and an ash discharge chamber (204). The cooling chamber (101), the airflow channel (203) and the gas outlet (202) are connected in sequence to form a gas flow passage. The material discharge grid (3) is provided with several wind baffles (4), and a ash passage gap (401) is formed between two adjacent wind baffles (4). The airflow channel (203) and the ash discharge chamber (204) are connected through the ash passage gap (401).

2. The device for recycling primary dust from a converter as described in claim 1, characterized in that, The ash hopper (2) is an inverted cone-shaped hopper with a cross-sectional area that gradually decreases from top to bottom. The gas outlet (202) is connected to the top of the ash hopper (2), and the ash outlet (201) is located at the bottom of the ash hopper (2).

3. The device for recycling primary dust from a converter as described in claim 1, characterized in that, The material feeding grid (3) has a bottom edge (301) and two ash guiding inclined edges (302) are provided on both sides of the bottom edge (301). The ash guiding inclined edges (302) are inclined in the same direction as the inclined inner wall of the ash hopper (2). The bottom edge (301) is provided with a centralized ash feeding hole (303). The bottom edge (301) is used to collect coarse ash and discharge it into the ash feeding chamber (204) through the centralized ash feeding hole (303).

4. The device for recycling primary dust from a converter as described in claim 1, characterized in that, In the airflow channel (203), the wind baffles (4) are arranged sequentially along the direction of gas flow, and the angle between the wind baffles (4) and the horizontal direction along the direction of gas flow gradually increases, so that the direction of gas flow and the extension direction of the ash passage gap (401) always form an angle.

5. The device for recycling primary dust from a converter as described in claim 3, characterized in that, Also includes: The first rotating separator (5) is rotatably disposed in the centralized dust collection hole (303) via a rotating shaft (501). The rotation direction of the first rotating separator (5) is the same as the gas flow direction. The first rotating separator (5) is provided with a plurality of first flaps (6) along the circumference of the rotating shaft (501). The first rotating separator (5) is configured such that after being rotated by the airflow, it drives the first flaps (6) to block or unblock the centralized dust collection hole (303).

6. The device for recycling primary dust from a converter as described in claim 5, characterized in that, Also includes: The second rotating separator (7) is synchronously and in the same direction as the first rotating separator (5) and is disposed in the centralized ash discharge hole (303). The second rotating separator (7) is provided with a second flap (8). The first flap (6) is provided with a first comb tooth (601), and the second flap (8) is provided with a second comb tooth (801). The first rotating separator (5) and the second rotating separator (7) are configured to rotate when driven by airflow. The first comb tooth (601) and the second comb tooth (801) rotate in a staggered manner to agitate the coarse ash and cause the coarse ash to enter the ash discharge chamber (204) under the rotation of the first comb tooth (601) and the second comb tooth (801).

7. The device for recycling primary dust from a converter as described in claim 1, characterized in that, Also includes: Bucket elevator (9) is provided with a lifting inlet (901), and the ash outlet (201) is connected to the lifting inlet (901). The bucket elevator (9) is used to lift and transport the coarse ash discharged from the ash outlet (201) upward.

8. The device for recycling primary dust from a converter as described in claim 7, characterized in that, The bucket elevator (9) is provided with an elevator outlet (902) and an intermediate ash collection silo (903) at the top, and the elevator outlet (902) leads to the intermediate ash collection silo (903).

9. The device for recycling primary dust from a converter as described in claim 1, characterized in that, The ash outlet (201) is equipped with a flap valve for closing or opening the ash outlet (201).

10. The device for recycling primary dust from a converter as described in claim 8, characterized in that, The intermediate ash collection silo (903) is equipped with a weighing device for weighing the coarse ash in the ash collection silo.

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