Split type wear-resistant lining plate for blast furnace slag chute

Abstract

The utility model discloses a blast furnace slag flushing ditch split type wear -resistant lining plate belongs to blast furnace slag flushing ditch lining plate technical field, the lining board is fixed on the inner wall of slag flushing ditch, the lining board includes arc bottom plate and two side plates, the top of each side plate is equipped with the groove that extends along the ditch length direction, one end of the side plate support is inserted in the groove, the other end of side plate support is fixed in the concrete side wall of slag flushing ditch or is connected with fixed base, the fixed base is fixed on the concrete side wall of slag flushing ditch, wherein, the both ends of bottom plate and the lower end of side plate are connected and constitute the plug -in installation part, and the bearing part is formed by bottom plate end portion on the side to the slag flushing ditch flow channel, the top surface of bearing part is with the inside of facing flow channel as the highest point, and it is opposite with the plug -in surface of side plate lower end with tiny assembly gap or abuts. The utility model solves the present lining in the technical problem such as insufficient spacing support, and ditch wall anchoring is not adjustable, and node anti -scour is poor, and back gap induces secondary scour, and heat stress release is difficult.

Description

Technical Field

[0001] This utility model belongs to the technical field of blast furnace slag flushing trough lining plates, and particularly relates to a split-type wear-resistant lining plate for blast furnace slag flushing troughs. Background Technology

[0002] In the blast furnace ironmaking process, the slag produced is subjected to high-pressure water jets to rapidly cool and break down the slag into granules. The slag then flows into the settling basin via the flushing channel. The flushing water is hot, has a large flow rate, and is corrosive. The flushing channel liner is a wear-resistant and corrosion-resistant inner lining structure installed along the bottom and walls of the flushing channel in the blast furnace ironmaking granulation flushing system. Its function is to provide a stable erosion-resistant surface and smooth flow path under the long-term action of high-temperature, high-velocity, solid-particle-containing, and corrosive flushing water, and to reliably transfer the hydraulic load to the civil engineering channel body. This type of liner is typically used in the slag-water channel from the blast furnace tapping area to the settling basin, and is subjected to long-term thermal shock, particle abrasion, and pulsating pressure, requiring strict standards for materials, structural connections, and hydraulic profile.

[0003] Existing projects mostly use wear-resistant metal lining plates or cast stone lining plates: metal lining plates are fixed to the trench body by welding / bolts and directly withstand the scouring of slag-containing water, with a normal service life of about 8-10 months, and less than half a year in areas with severe impact; cast stone solutions usually involve the installation of an outer mold and an inner lining plate, with the outer mold used for positioning before bonding or mechanical fixing, but due to the poor adhesion of cast stone and the tendency to form longitudinal "grooves" on the plate surface after erosion, installation is also more complicated. The above methods achieve wear-resistant lining to a certain extent, but under the combined effects of strong scouring, thermal shock and vibration, many structural and hydraulic deficiencies are still exposed.

[0004] First, the limiting and supporting mechanisms between the base plate / side plate and the trench body, as well as between the plates, are insufficient. Under periodic impacts and vibrations, vertical "sliding" and lateral "swaying / misalignment" are easily generated, making it difficult to maintain the flatness of the inner surface in the long term. Second, the anchoring and installation adjustability with the trench wall are insufficient. When relying on the external mold or rigid connection, it is difficult to eliminate civil engineering errors, resulting in deviations in the geometric shape of the flow channel and local secondary scouring. Third, the erosion resistance of the materials and nodes is insufficient. Metal / cast stone is prone to groove-like wear and adhesion and caking in high-temperature slag-containing water. In addition, the back gap / cavity between the liner and the trench wall is prone to inducing concentrated eddy current scouring. Finally, the constraint stress caused by thermal expansion and micro-deformation of the foundation is prone to stone cracking or node instability. All of the above problems together restrict long-term stable operation. Utility Model Content

[0005] The purpose of this utility model is to provide a split-type wear-resistant liner for blast furnace slag flushing channels. Under the coupled effects of high temperature, high flow velocity, solid erosion and vibration, the split-type wear-resistant liner has internal support, anti-pull-out and adjustable anchoring to maintain the geometric stability of the flow channel and the anti-erosion performance for a long time.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A split-type wear-resistant liner for blast furnace slag flushing troughs is disclosed. The liner is fixed to the inner wall of the slag flushing trough. The liner includes an arc-shaped bottom plate and two side plates. Each side plate has a groove extending along the length of the trough at its top. One end of a side plate bracket is inserted into the groove, and the other end of the side plate bracket is fixed to the concrete side wall of the slag flushing trough or connected to a fixing seat. The fixing seat is fixed to the concrete side wall of the slag flushing trough. The two ends of the bottom plate are connected to the lower ends of the side plates to form an insertion mounting part. A support part is formed from the end of the bottom plate on the side facing the slag flushing trough channel. The top surface of the support part has its highest point on the inner side facing the channel. The top surface of the support part is close to or opposite the insertion surface of the lower end of the side plate with a small assembly gap to provide inner support for the side plate and restrict its vertical sliding.

[0007] Preferably, the plug-in mounting parts are provided with paired through holes; steel pins are provided in the paired through holes; forming a detachable mechanical locking and shear force transmission, improving the positioning accuracy and anti-pull-up ability of the base plate and side plate, and facilitating the quick replacement of individual side plates or base plates in the later stage.

[0008] Preferably, the plug-in mounting part is a matching concave-convex step structure, which expands the pressure contact area through geometric support and limiting, disperses edge stress, and suppresses relative slippage and misalignment under scouring vibration.

[0009] Preferably, the plug-in mounting part is dovetail-shaped or inverted T-shaped; utilizing the self-locking characteristic, it significantly enhances the resistance to pulling up and overturning, and limits lateral swinging.

[0010] Preferably, the fixing seat is anchored to the concrete sidewall of the slag flushing ditch by expansion bolts, which can be quickly constructed without the need for pre-embedded parts and form a stable anchoring pre-tightening force, reliably transmit lateral loads, and facilitate maintenance and replacement.

[0011] Preferably, the side plate bracket and the fixing seat are fixed by adjusting bolts; this provides installation fine-tuning and locking, compensates for processing and civil engineering deviations, and ensures the flatness and alignment of the inner surface.

[0012] Preferably, a concrete filling layer is poured into the gap between the liner and the slag flushing ditch to fill the gap and integrate the liner and the ditch wall, reduce cavity eddies and erosion, and at the same time cover and protect exposed parts from corrosion and wear.

[0013] Preferably, the arc-shaped bottom plate and the two side plates form a U-shape to create a smooth flow channel to guide the fluid, reduce secondary flow and turbulence, evenly distribute the scouring load, and reduce local wear grooves.

[0014] Preferably, the arc-shaped base plate and the two side plates are segmented along the length of the groove, and expansion joints are provided between adjacent horizontal segments to absorb displacement caused by thermal expansion / foundation settlement, release thermal stress, reduce the risk of stone cracking and instability, and facilitate transportation, installation and partial replacement.

[0015] Preferably, the material of the liner is wear-resistant stone, which is one of granite, basalt, or gabbro; providing a high-density, high-hardness, and low-water-absorption substrate, improving wear resistance, corrosion resistance, and thermal shock resistance, extending service life, and reducing maintenance frequency and cost.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This utility model, through a complete structure of "bottom-side insertion combined with inner-side support, top-groove anchoring, integrated filling, and segmented expansion," solves the technical problems of existing linings, such as insufficient limiting support, non-adjustable anchoring to the trench wall, poor scour resistance at joints, secondary scour induced by back gaps, and difficulty in releasing thermal stress. Thus, it maintains the geometric and stress stability of the lining over a long period under strong scour and thermal shock conditions. Its specific effects are reflected in: To address the issues of vertical slippage and lateral misalignment: Within the insertion mounting section formed by the two ends of the base plate and the lower end of the side plate, a support part is installed facing the innermost and outermost points of the flow channel, with the highest point on the inner side. This support part is then placed against / with a slight gap from the insertion surface of the lower end of the side plate, achieving passive support and limiting. Furthermore, through the mortise and tenon joint with through holes and steel pins, or self-locking geometric fits such as concave-convex steps / dovetails / inverted Ts, a multi-path limiting mechanism is formed to prevent upward pull-out and lateral swaying, thus suppressing misalignment and loosening in the long term.

[0017] To address the issues of anchoring and installation accuracy with the trench wall: each side plate has a groove on its top along the length of the trench, into which a side plate bracket is inserted and connected to a fixing seat. It is then anchored to the concrete side wall by expansion bolts, and with the help of adjusting bolts, fine-tuning and locking are achieved. This rigidly transfers the hydraulic lateral load to the civil engineering structure while ensuring the flatness and alignment of the inner surface.

[0018] To address the issues of back gap eddy currents and node erosion: a concrete filling layer is poured between the liner and the trench wall to transform point / line contact into surface contact and overall stress distribution. Exposed components such as fixing seats, supports, and anchor bolts are also covered and isolated to reduce eddy currents and secondary erosion, thereby improving node durability.

[0019] To address the issues of uniform flow field and concentrated wear: a smooth flow channel with an arc-shaped bottom plate and a U-shaped cross section is adopted to improve the boundary layer distribution, reduce the central groove effect, and make wear more uniform and controllable.

[0020] To address the issues of thermal expansion and minor deformation of the foundation: the lining plates are segmented according to the length of the trench and expansion joints are provided to release the constraint stress under high-temperature conditions, prevent the stone from cracking and becoming unstable, and facilitate the disassembly and replacement of individual sections.

[0021] In summary, this invention ensures erosion resistance and geometric stability while being independent of external molds and featuring a clear installation process, making it suitable for rapid, segmented on-site construction. Utilizing high-density, low-absorption natural stone such as granite, basalt, or gabbro, combined with the aforementioned structure-process system, it is expected to achieve a service life of over 5 years in engineering practice, significantly improving operational stability and reducing maintenance frequency and downtime risks. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an implementable structure of a preferred embodiment of the present utility model; Figure 2 This is a schematic diagram of another implementable structure in a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of an implementable plug-in structure in a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the side plate mounting structure in a preferred embodiment of the present utility model; Figure 5 This is a schematic diagram of an implementable side plate support structure in a preferred embodiment of the present utility model; Figure 6 This is a schematic diagram of another feasible side plate support structure in a preferred embodiment of the present invention.

[0023] In the diagram: 1. Slag flushing trench; 2. Bottom plate; 3. Side plate; 4. Side plate bracket; 5. Fixing seat; 6. Insertion mounting part. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] like Figures 1-6 As shown: A split-type wear-resistant liner for blast furnace slag flushing troughs is disclosed, wherein the liner is fixed to the inner wall of the slag flushing trough. The liner includes an arc-shaped bottom plate and two side plates; the arc-shaped bottom plate and the two side plates are assembled to form a U-shaped inner liner, which is used to directly withstand the scouring of high-temperature, high-speed slag flushing water flow and the solid particles it carries.

[0026] Each side plate has a groove extending along the length of the ditch at its top. One end of a side plate bracket is inserted into the groove, and the other end of the bracket is fixed to the concrete sidewall of the slag flushing ditch or connected to a fixing seat. The fixing seat is anchored to the concrete sidewall of the slag flushing ditch with expansion bolts, thus forming a reliable lateral fixation. To accommodate construction deviations, the side plate bracket and the fixing seat are connected by adjusting bolts, allowing the side plate to be finely adjusted within ±2 to 10 mm in the horizontal or vertical range, ensuring the overall flatness and alignment of the lining.

[0027] Insertion mounting parts are provided at both ends of the base plate where they meet the lower ends of the side plates. On the side facing the slag flushing channel, the end of the base plate forms a support part, with the highest point of the top surface of the support part facing the inner side of the channel. It is close to or opposite the insertion surface of the lower end of the side plate with a slight assembly gap. The height difference provides support for the side plate on the inner side, preventing the side plate from sliding vertically under the impact and vibration of the slag flushing water. This support principle is equivalent to creating an "inner shoulder" between the stones, changing the force direction from shear to compression, which significantly improves the stability of the lining plate connection.

[0028] The highest point refers to the point where the height of the top surface of the support is the greatest on the cross-section in the width direction of the base plate, located on the inner side facing the flow channel; the top surface of the support can be a straight line with an inclination, a circular arc or a broken line transition, and there is no limit to the specific curved surface shape.

[0029] In different implementations, the plug-in mounting portion can adopt various structures: Mortise and tenon joint: The bottom plate and the lower end of the side plate are respectively provided with matching through holes, and steel pins are inserted into the holes. The steel pins are preferably made of stainless steel or duplex stainless steel and have limiting rings, which can form a detachable mechanical lock and shear force transmission, improve the positioning accuracy and anti-pull-out ability of the bottom plate and the side plate, and facilitate the quick disassembly and replacement of individual lining plates.

[0030] Stepped limiting fit: The bottom plate end is machined into an upward convex step, and the lower end of the side plate forms a corresponding concave step. The two work together to achieve limiting. The convex step forms a support part on its inner side, directly supporting the lower end of the side plate, increasing the pressure contact area, dispersing local stress, and suppressing relative slippage and misalignment under the conditions of slag and water impact and vibration.

[0031] Dovetail or inverted T-shaped structure: The plug-in mounting part or top groove is made into a dovetail or inverted T-shaped cross section. This type of structure has the self-locking characteristics of "narrow opening and wide inner cavity" or "shoulder hook connection", which can significantly enhance the resistance to upward pulling and overturning, and effectively limit the lateral swing of the side plate, thereby further improving the connection firmness.

[0032] To enhance overall integrity and durability, a concrete filling layer is poured into the gap between the U-shaped lining and the slag-flushing channel. This filling layer serves two purposes: firstly, it seals the gaps and eliminates cavities, reducing localized turbulence and erosion; secondly, it protects exposed components such as mounting bases, side plate supports, and expansion bolts, preventing corrosion and wear of metal parts in high-temperature, high-velocity, and slag-laden water environments. The concrete covering layer is preferably ≥10 mm thick, and the closest distance between it and the inner surface of the flow channel is ≥5 mm to ensure unobstructed flow.

[0033] The aforementioned arc-shaped base plate and two side plates are set in sections along the length of the trench. The unit length is generally 0.8 to 1.5 m. Expansion joints of 3 to 8 mm are set between adjacent sections and filled with high-temperature resistant elastic material to absorb displacement caused by thermal expansion and foundation settlement, release thermal stress, reduce the risk of stone cracking and instability, and facilitate transportation, installation and partial replacement.

[0034] The lining plate is made of wear-resistant stone, specifically one of granite, basalt, or gabbro, all with an apparent density ≥2.7 g / cm³. 3 With physical properties such as Shore hardness ≥ HS70 and water absorption ≤ 0.5%, the stone material possesses high wear resistance, corrosion resistance, and thermal shock resistance. Under conditions of high-temperature water flow (temperature can reach 200-300℃), high flow velocity (1-2 m / s), and solid particle content in slag flushing ditches, the wear-resistant life of the stone lining can reach more than 5 years, which is significantly better than traditional metal linings (8-10 months) and cast stone linings (about 6 months).

[0035] Working principle: During assembly, the bottom of the slag flushing ditch is first aligned and a concrete pad is laid. After the arc-shaped base plate is positioned along the center line, the two side plates are inserted from above into the insertion mounting part formed by the end of the base plate. Since the support part is formed by the end of the base plate on the side facing the slag flushing ditch channel, the top surface of the support part has the inner side facing the channel as the highest point. It is close to the insertion surface of the lower end of the side plate or opposite to it with a small assembly gap. The self-weight of the side plate and the construction clamping force are immediately "supported" by the support part. The main force between the base plate and the side plate changes from shearing, which is prone to displacement, to compression and close contact. Then, steel pins are inserted into the matching through holes as needed to achieve shear locking, or concave and convex steps are used to form geometric limit on the contact surface. The side plate bracket is pushed into the longitudinal groove at the top of the side plate. The other end is connected to the fixing seat and anchored to the concrete side wall by expansion bolts. Horizontal / vertical fine adjustments are made by adjusting the bolts to eliminate processing and civil engineering deviations, so that the inner surface of the U-shaped lining is aligned and smooth. Finally, a concrete filling layer is poured between the lining plate and the trench wall, and the exposed fasteners are covered to eliminate back gaps and cavities, increase the contact area and structural damping, and isolate the metal parts from the high-temperature slag-containing water environment.

[0036] After commissioning, the lateral impact force of the solid-containing slag-laden water on the side plate is transmitted to the civil structure through a rigid force chain consisting of the side plate support, fixing seat, expansion bolts, and concrete side wall. The vertical component force caused by periodic pulsation and particle impact is first absorbed by the support part, and the lower end of the side plate is forced to bear the pressure on the support part instead of relying solely on the connector to bear the shear, thus suppressing the downward trend. The excitation in the upward and overturning directions is offset by tenon and mortise pins (steel pins bear double shear in the hole) or concave and convex steps (inner and outer shoulders limit simultaneously); if the insertion part or the upper groove adopts a dovetail / inverted T-shaped section, the self-locking effect generates an additional wedging force during outward pull, further limiting upward pull and lateral swing. The poured concrete filling layer transforms point / line contact into surface contact and overall force distribution, reducing backflow eddies and secondary scouring, and suppressing fretting wear between the liner and the trench wall; the coating layer prevents water flow from directly scouring and corroding the fixing seat and anchor bolts, delaying the failure of metal parts. The U-shaped flow channel formed by the arc bottom and side plates ensures a smooth transition of the streamlines and a more uniform distribution of shear stress. This prevents the rapid formation of the central groove and reduces the likelihood of particles getting stuck and accumulating at the joints. The lining plates are segmented along the groove length with expansion joints to release displacement caused by thermal expansion and slight foundation settlement, preventing stone cracking and misalignment. This also facilitates individual segment disassembly and replacement. Overall, the device utilizes a multi-path coupling mechanism of "internal support combined with plug-in self-locking / shear locking, lateral anchoring, and integrated filling" to maintain the geometric stability and surface smoothness of the lining under combined conditions of high temperature, high flow velocity, solid erosion, and vibration. This reduces wear and maintenance frequency and extends service life.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split-type wear-resistant liner for a blast furnace slag flushing ditch, wherein the liner is fixed to the inner wall of the slag flushing ditch, characterized in that: The lining plate includes an arc-shaped base plate and two side plates. Each side plate has a groove extending along the length of the ditch at its top. One end of a side plate bracket is inserted into the groove, and the other end of the bracket is fixed to the concrete sidewall of the slag-flushing ditch or connected to a fixing seat, which is fixed to the concrete sidewall of the slag-flushing ditch. The two ends of the base plate connect with the lower ends of the side plates to form an insertion mounting portion. A support portion is formed at the end of the base plate on the side facing the slag-flushing ditch channel. The highest point of the top surface of the support portion is the inner side facing the channel. The top surface of the support portion is abutted against or slightly gapped against the insertion surface of the lower end of the side plate. The top surface of the support is vertically higher than the insertion surface at the lower end of the side plate.

2. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The plug-in mounting parts are provided with paired through holes; steel pins are provided in the paired through holes.

3. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The plug-in mounting part has a mating concave-convex step structure.

4. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The plug-in mounting part is dovetail-shaped or inverted T-shaped.

5. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The fixing seat is anchored to the concrete sidewall of the slag flushing ditch by expansion bolts.

6. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The side plate bracket and the fixing seat are fixed by adjusting bolts.

7. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, A concrete filling layer is poured into the gap between the liner and the slag flushing ditch.

8. The split-type wear-resistant lining plate for blast furnace slag flushing groove according to claim 1, characterized in that, The curved base plate and two side plates form a U-shape.

9. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The arc-shaped bottom plate and the two side plates are set in sections along the length of the trench, and expansion joints are set between adjacent horizontal sections.

10. The split-type wear-resistant lining plate for blast furnace slag flushing grooves according to claim 1, characterized in that, The lining plate is made of wear-resistant stone, specifically one of granite, basalt, or gabbro.

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