Pre-stress metal ceramic slag discharge trough with thermal shock resistance and preparation method of pre-stress metal ceramic slag discharge trough

Abstract

The invention discloses a prestressed metal ceramic deslagging trough with thermal shock resistance and a preparation method thereof, and relates to the technical field of blast furnace deslagging, the prestressed metal ceramic deslagging trough comprises a concrete trough foundation and a plurality of deslagging pipes connected in sequence, and each deslagging pipe comprises an arc-shaped metal shell, a heat preservation and insulation layer and a ceramic lining plate which are sequentially distributed from outside to inside; the arc-shaped metal shell is located in a concrete groove foundation, the heat preservation and insulation layer is arranged on the inner side wall of the arc-shaped metal shell, the multiple ceramic lining plates are assembled on the side, away from the arc-shaped metal shell, of the heat preservation and insulation layer in a modularized mode, a locking mechanism is installed on the slag discharging pipe, and the arc-shaped metal shell applies pre-compression stress to the heat preservation and insulation layer through the locking mechanism. And the ceramic lining plate is in a pressed state. A three-layer composite prestress structure is adopted, so that the ceramic lining plate is pressed to resist thermal shock, has heat preservation, wear resistance and corrosion resistance, effectively reduces heat loss, prevents cracking, and remarkably prolongs the service life of the slag discharge trough.

Description

Technical Field

[0001] This invention relates to the field of blast furnace slag discharge technology, specifically to a prestressed cermet slag discharge ditch with thermal shock resistance and its preparation method. Background Technology

[0002] In the blast furnace ironmaking process, in addition to molten iron, a large amount of high-temperature slag is also produced. This slag mainly consists of gangue, ash, and flux, with a temperature as high as 1450-1600℃. The sensible heat it carries accounts for a considerable proportion of the total heat output of the blast furnace. Blast furnace slag is usually treated by hydraulic flushing or bottom filtration to rapidly cool and granulate the high-temperature slag into glassy slag, which is then used as a cement admixture or building material. In this process, the slag discharge ditch, as a key channel connecting the blast furnace slag outlet and the granulation equipment, plays a crucial role in the stable transport of high-temperature molten slag. Its operational reliability directly affects the continuity and safety of blast furnace production.

[0003] Currently, blast furnace slag discharge troughs generally adopt a V-shaped water-cooled structure, with the trough body welded from steel plates and lined with refractory materials or wear-resistant plates. However, this traditional structure has revealed many defects in practical applications: First, the V-shaped structure is prone to severe thermal stress concentration when heated, and coupled with the drastic temperature fluctuations caused by the intermittent discharge of high-temperature molten slag, it leads to frequent cracking of the trough body and a short service life; second, the water-cooled structure dissipates heat quickly but has poor insulation performance, resulting in a large amount of heat loss, which contradicts the current development direction of energy conservation and carbon reduction in the steel industry; third, existing wear-resistant lining materials cannot simultaneously meet the performance requirements of high-temperature strength, thermal shock resistance, and low thermal conductivity, often resulting in compromises in certain aspects. Summary of the Invention

[0004] This invention provides a prestressed metal-ceramic slag discharge ditch with thermal shock resistance and its preparation method, which can solve the problems of thermal stress concentration and easy cracking, large heat loss, insufficient wear and corrosion resistance, and unfavorable to stable slag transportation in the existing V-shaped water-cooled slag discharge ditch structure.

[0005] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides a prestressed metal-ceramic slag discharge trench with thermal shock resistance, comprising a concrete trench foundation and a plurality of slag discharge pipes connected in sequence. Each slag discharge pipe includes an arc-shaped metal shell, a thermal insulation layer, and ceramic liners arranged sequentially from the outside to the inside. The arc-shaped metal shell is located within the concrete trench foundation. The thermal insulation layer is disposed on the inner wall of the arc-shaped metal shell. A plurality of ceramic liners are modularly assembled on the side of the thermal insulation layer away from the arc-shaped metal shell. A locking mechanism is installed on the slag discharge pipe. The arc-shaped metal shell applies pre-compressive stress to the thermal insulation layer through the locking mechanism, so that the ceramic liners are under pressure. The slag discharge pipe has a top-opening structure, and a cover plate for heat radiation protection is installed at the opening.

[0006] As a further embodiment of the present invention: the locking mechanism includes a baffle, a pre-embedded screw, and a locking nut. The pre-embedded screw is disposed at the circumferential end of the thermal insulation layer. The ceramic lining plates at the circumferential end and both circumferential ends of the thermal insulation layer abut against the side of the baffle. The baffle is provided with a corresponding through hole for the pre-embedded screw to pass through. The locking nut is threadedly sleeved with the portion of the pre-embedded screw that passes through the through hole.

[0007] As a further aspect of the present invention: protrusions are installed at the ends of adjacent arc-shaped metal shells, and fastening bolts are installed between the corresponding protrusions.

[0008] As a further aspect of the present invention: the cover plate includes an arc-shaped heat-insulating top plate and a filling layer, the arc-shaped heat-insulating top plate is disposed between two baffles, the arc-shaped heat-insulating top plate has a hollow structure, and the filling layer is disposed inside the arc-shaped heat-insulating top plate.

[0009] As a further aspect of the present invention: the ends of the arc-shaped metal shell and the baffle are welded together with end plates, and the end plates abut against the heat insulation layer and ceramic lining plate at both ends of the slag discharge pipe.

[0010] As a further aspect of the present invention: a curable and expandable grouting material is poured into the concrete trench foundation.

[0011] As a further aspect of the present invention: an arc-shaped reinforcing plate is provided at the gap between the outer wall of the slag discharge pipe and the inner wall of the concrete trench foundation, and the arc-shaped reinforcing plate is fitted into the gap to fix and lock the slag discharge pipe.

[0012] As a further aspect of the present invention, the bottom of the arc-shaped heat-insulating top plate is coated with an anti-radiation coating.

[0013] A second aspect of the present invention provides a method for preparing a prestressed cermet slag discharge ditch with thermal shock resistance, comprising the following steps: Step 1: Weld steel mesh to the inside of the arc-shaped metal shell and pour lightweight insulating castable to form a thermal insulation layer; Step 2: High-density ceramic lining plates are obtained by isostatic pressing or slurry casting and high-temperature sintering. The surface of the ceramic lining plates is roughened. Then, the ceramic lining plates are embedded into the inner side of the thermal insulation layer and fixed by high-temperature ceramic adhesive or mechanical anchoring. Step 3: Install a locking mechanism on the curved metal shell. Use the locking mechanism to apply pre-compression stress to the thermal insulation layer, so that the ceramic liner is under pressure, thereby forming a slag discharge pipe with an opening at the top. Step 4: After assembling and connecting multiple slag discharge pipes in sequence, install them in the concrete trench foundation. Cover the top opening of the slag discharge pipes with cover plates to form a slag discharge ditch.

[0014] As a further aspect of the present invention: during the initial heating and operation of the slag discharge pipe, the thermal insulation layer can be sintered and densified in situ to form a lightweight thermal insulation ceramic layer.

[0015] The beneficial effects of this invention are: 1. In this invention, a composite pipe structure consisting of an arc-shaped metal shell, a thermal insulation layer, and a ceramic liner is adopted, with the ceramic liner modularly assembled inside the thermal insulation layer to form a top-opening slag discharge channel. This three-layer composite structure effectively utilizes the advantages of each layer's materials: the outer metal shell provides structural support, the middle thermal insulation layer significantly reduces heat loss, and the inner high-density ceramic liner directly contacts the high-temperature molten slag, possessing excellent wear resistance, corrosion resistance, and high-temperature resistance. This solves the problems of poor insulation, large heat loss, and insufficient wear and corrosion resistance in existing slag discharge channels.

[0016] 2. In this invention, a locking mechanism is installed on the arc-shaped metal shell. This mechanism applies pre-compressive stress to the thermal insulation layer, ensuring that the inner ceramic liner is always under pressure. This pre-stress design effectively counteracts the thermal tensile stress generated by the impact of high-temperature molten slag during the operation of the slag discharge ditch, significantly improving the thermal shock resistance of the ceramic liner and preventing cracking and spalling caused by high-intensity thermal shock due to intermittent material discharge. This solves the problems of thermal stress concentration leading to cracking and poor thermal shock resistance in existing technologies.

[0017] 3. In this invention, by setting a cover plate for heat radiation protection at the top opening of the slag discharge pipe, the heat loss of high-temperature molten slag through radiation is further reduced, and the heat preservation effect is enhanced. At the same time, it can effectively prevent external debris from falling into the ditch. Furthermore, the setting of the cover plate does not hinder the installation and function of the locking mechanism. This achieves synergistic optimization of heat preservation, protection and structural function, and solves the problem of large heat loss and unfavorable stable molten slag transportation in existing slag discharge ditches. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the prestressed metal-ceramic slag discharge ditch with thermal shock resistance of the present invention; Figure 2 This is a perspective view of the prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to the present invention; Figure 3 This is a perspective view of the prestressed metal-ceramic slag discharge ditch with thermal shock resistance of the present invention after the cover plate is removed; Figure 4 This is a perspective view of the slag discharge pipe in the prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to the present invention; Figure 5 yes Figure 4 Enlarged view of part A in the middle.

[0020] In the diagram: 100, concrete trench foundation; 101, grouting material; 200, slag discharge pipe; 201, arc-shaped metal shell; 202, thermal insulation layer; 203, ceramic lining plate; 300, locking mechanism; 301, baffle; 302, embedded screw; 303, locking nut; 400, cover plate; 401, arc-shaped thermal insulation top plate; 402, filling layer; 403, anti-radiation coating; 500, protrusion; 501, fastening bolt; 600, end plate; 700, arc-shaped reinforcing plate. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0022] like Figures 1-5 As shown, the present invention is a prestressed metal-ceramic slag discharge trench with thermal shock resistance, comprising a concrete trench foundation 100 and a plurality of slag discharge pipes 200 connected in sequence. Each slag discharge pipe 200 includes an arc-shaped metal shell 201, a thermal insulation layer 202, and ceramic liners 203 arranged sequentially from the outside to the inside. The arc-shaped metal shell 201 is located inside the concrete trench foundation 100. The thermal insulation layer 202 is disposed on the inner wall of the arc-shaped metal shell 201. A plurality of ceramic liners 203 are modularly assembled on the side of the thermal insulation layer 202 away from the arc-shaped metal shell 201. A locking mechanism 300 is installed on the slag discharge pipe 200. The arc-shaped metal shell 201 applies pre-compression stress to the thermal insulation layer 202 through the locking mechanism 300, so that the ceramic liners 203 are under pressure. The slag discharge pipe 200 has a top-opening structure, and a cover plate 400 for heat radiation protection is installed at the opening.

[0023] It should be noted that in this embodiment, the dimensions of the arc-shaped metal outer shell 201 are as follows: inner diameter 500-2000mm, wall thickness 8-25mm, inner wall sandblasting to enhance mechanical bonding with the thermal insulation layer 202, and outer wall treated with an anti-corrosion coating. The thermal insulation layer 202 uses mullite castable sintered at low temperature, possessing self-healing cracking capability under intermittent operating conditions, refractoriness ≥1350℃, long-term service temperature ≤1200℃; sintering temperature range: 1100-1350℃. During the initial heating and operation of the slag discharge pipe 200, in-situ sintering and densification can be achieved, forming a lightweight thermal insulation ceramic layer. The linear shrinkage rate after sintering is ≤3%, avoiding cracking or delamination. The compressive strength after sintering is ≥10MPa, maintaining structural integrity at high temperatures. The ceramic lining plate 203 is made of silicon carbide (high thermal conductivity, high hardness, and excellent erosion resistance), silicon nitride combined with silicon carbide (combining high toughness and oxidation resistance, suitable for alternating heat load conditions), and alumina corundum (high refractoriness and resistance to alkaline slag wetting). Its refractoriness is ≥1650℃, softening temperature ≥1500℃; its wetting performance is ≥100° with typical high-temperature molten slag (such as blast furnace slag and gasification furnace slag), effectively preventing slag adhesion, penetration, and chemical corrosion; its structural parameters are 50-100 mm thick, and it can be designed as a modular assembly structure for easy replacement and maintenance; additional performance requirements are: bulk density ≥3.0 g / cm³, apparent porosity ≤10%, and flexural strength ≥60MPa (at 1200℃); its functional positioning is to directly contact high-temperature molten slag, undertaking the primary protective tasks of wear resistance, erosion resistance, and thermal shock resistance.

[0024] During installation, the slag discharge ditch applies continuous pre-compressive stress to the thermal insulation layer 202 via a locking mechanism 300 mounted on the arc-shaped metal outer shell 201, ensuring that the ceramic liner 203 remains under pressure. At room temperature, the arc-shaped metal outer shell 201 applies pre-compressive stress to the thermal insulation layer 202, keeping the ceramic liner 203 under pressure. During intermittent discharge of high-temperature molten slag from the blast furnace, the slag directly impacts and flows onto the surface of the ceramic liner 203, causing it to heat up to the operating temperature (800-1200℃). The thermal expansion of the arc-shaped metal outer shell 201 is greater than that of the thermal insulation layer 202, further compressing the thermal insulation layer 202. Simultaneously, the thermal insulation layer 202 undergoes in-situ sintering at 1100-1350℃, resulting in slight volume shrinkage and releasing some of the compressive strain. Meanwhile, the ceramic liner... Because the thermal expansion of plate 203 is constrained by the arc-shaped metal shell 201, a continuous compressive stress field is formed. This ultimately results in a stable stress distribution of "ceramic under compression, metal under tension, and dense support from the insulation layer," which effectively counteracts the tensile stress generated by thermal shock, significantly improves thermal shock resistance, and prevents cracking and peeling. Some of the heat that passes through the ceramic liner 203 is effectively blocked by the thermal insulation layer 202, greatly reducing the heat conduction to the arc-shaped metal shell 201 and the outside, thus achieving energy saving and consumption reduction. At the same time, the cover plate 400 installed at the opening can effectively block the loss of high-temperature radiant heat to the environment.

[0025] like Figures 3-5 As shown, the locking mechanism 300 includes a baffle 301, a pre-embedded screw 302, and a locking nut 303. The pre-embedded screw 302 is located at the circumferential end of the thermal insulation layer 202. The ceramic lining plates 203 at both circumferential ends of the thermal insulation layer 202 abut against the side of the baffle 301. The baffle 301 is provided with a through hole for the pre-embedded screw 302 to pass through. The locking nut 303 is threadedly sleeved with the portion of the pre-embedded screw 302 that passes through the through hole.

[0026] It should be noted that during assembly, tightening the locking nut 303 causes the two baffles 301 to retract inward, forcing the baffles 301 to fit tightly against the circumferential ends of the arc-shaped metal shell 201 and the ends of the thermal insulation layer 202 and the ceramic liner 203. In this fitted state, the baffles 301 are welded and fixed to the arc-shaped metal shell 201 to ensure the permanent positioning of the baffles 301. Subsequently, the locking nut 303 is removed, and the portion of the pre-embedded screw 302 extending to the outside of the through hole is cut off and ground to avoid interference, thereby completing the installation of the locking mechanism 300 and enabling the ceramic liner 203 to obtain stable pre-compression stress.

[0027] like Figures 4-5 As shown, protrusions 500 are installed at the ends of adjacent arc-shaped metal shells 201, and fastening bolts 501 are installed between the corresponding protrusions 500.

[0028] It should be noted that the ends of adjacent arc-shaped metal shells 201 are positioned and connected by the installed protrusions 500, and the protrusions 500 are locked and fixed by the corresponding fastening bolts 501, so that the adjacent slag discharge pipes 200 are kept in close contact, effectively eliminating gaps and ensuring the quality of subsequent welding operations and the continuity of the overall structure.

[0029] like Figure 1 and Figures 4-5 As shown, the cover plate 400 includes an arc-shaped heat-insulating top plate 401 and a filling layer 402. The arc-shaped heat-insulating top plate 401 is disposed between two baffles 301. The arc-shaped heat-insulating top plate 401 has a hollow structure, and the filling layer 402 is disposed inside the arc-shaped heat-insulating top plate 401.

[0030] It should be noted that the arc-shaped heat-insulating top plate 401 is set between the two baffles 301 to cover the top opening of the slag discharge pipe 200. The arc-shaped heat-insulating top plate 401 adopts a hollow structure and is filled with a filling layer 402 inside. Through multiple heat insulation designs, it effectively blocks the heat radiation loss of high-temperature molten slag, reduces the heat loss to the environment, and works synergistically with the heat insulation layer 202 to improve the overall heat insulation effect.

[0031] like Figure 1 and Figures 3-4As shown, the ends of the arc-shaped metal shell 201 and the baffle 301 are welded together with end plates 600, and the end plates 600 are in contact with the heat insulation layer 202 and the ceramic lining plate 203 at both ends of the slag discharge pipe 200.

[0032] It should be noted that the limiting effect of the end plate 600 constrains the axial thermal insulation layer 202 and ceramic liner 203, preventing them from axial movement or displacement when subjected to thermal expansion or molten slag impact. At the same time, it works in conjunction with the locking mechanism 300 to keep the ceramic liner 203 under stable pressure in both the radial and axial directions, further improving the overall structural stability and thermal shock resistance of the slag discharge pipe 200.

[0033] like Figure 1 As shown, a curable and expandable grout 101 is poured into the concrete trench foundation 100. In this embodiment, the grout 101 is a high-strength micro-expansion microcrystalline ceramic grout.

[0034] It should be noted that when high-strength micro-expansion microcrystalline ceramic grouting material is used, the grouting material 101 expands in volume during the curing process. Its expansion force acts on the arc-shaped metal shell 201, forcing the arc-shaped metal shell 201 to further compress the inner thermal insulation layer 202 and ceramic liner 203. This allows the ceramic liner 203 to obtain additional pre-compression stress on the basis of the pre-compression stress applied by the original locking mechanism 300, further strengthening the compressive state of the ceramic liner 203 and improving its thermal shock resistance and structural reliability during use.

[0035] like Figure 1 and Figure 4 As shown, an arc-shaped reinforcing plate 700 is provided in the gap between the outer wall of the slag discharge pipe 200 and the inner wall of the concrete trench foundation 100, and the arc-shaped reinforcing plate 700 is fitted into the gap to fix and lock the slag discharge pipe 200.

[0036] It should be noted that the arc-shaped reinforcing plate 700 is used to radially fix and lock the slag discharge pipe 200, eliminating installation gaps and preventing displacement or vibration of the slag discharge pipe 200 during use. At the same time, it enhances the integrity of the connection between the slag discharge pipe 200 and the concrete trench foundation 100, ensuring the long-term stability of the prestressed system.

[0037] like Figure 1 As shown, the bottom of the arc-shaped heat-insulating top plate 401 is coated with an anti-radiation coating 403.

[0038] It should be noted that the anti-radiation coating 403 effectively reflects the thermal radiation generated by the high-temperature molten slag, reducing the transfer of radiant heat to the arc-shaped heat-insulating top plate 401, thereby further reducing the heat loss at the top of the slag discharge pipe 200, enhancing the overall heat insulation effect of the cover plate 400, and forming a synergistic heat insulation system with the heat insulation layer 202 to ensure the thermal stability and energy-saving performance of the slag discharge ditch under high-temperature conditions.

[0039] This invention provides a method for preparing a prestressed cermet slag discharge ditch with thermal shock resistance, comprising the following steps: Step 1: Weld steel mesh to the inside of the arc-shaped metal shell 201 and pour lightweight insulating castable to form an insulation layer 202; Step 2: The high-density ceramic liner 203 is obtained by isostatic pressing or slurry casting and sintering at high temperature. The surface of the ceramic liner 203 is roughened. Then the ceramic liner 203 is embedded into the inner side of the thermal insulation layer 202 and fixed by high-temperature ceramic adhesive or mechanical anchoring. Step 3: Install a locking mechanism 300 on the arc-shaped metal shell 201. Use the locking mechanism 300 to apply pre-compression stress to the thermal insulation layer 202 by the arc-shaped metal shell 201, so that the ceramic liner 203 is under pressure, thereby forming a slag discharge pipe 200 with an open top. Step 4: After assembling and connecting multiple slag discharge pipes 200 in sequence, install them in the concrete trench foundation 100. Use the cover plate 400 to cover the top opening of the slag discharge pipes 200 to form a slag discharge ditch.

[0040] During the initial heating and operation, the slag discharge pipe 200 can enable the thermal insulation layer 202 to achieve in-situ sintering and densification, forming a lightweight thermal insulation ceramic layer.

[0041] Comparison of technical indicators after the construction of slag discharge ditches: 1. Structural parameter table of water-cooled slag tank and the modified water-cooled slag tank.

[0042] 2. Table of relative cooling and temperature drop of water-cooled slag tank and modified slag tank

[0043] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A prestressed metal-ceramic slag discharge ditch with thermal shock resistance, comprising a concrete trench foundation (100) and a plurality of sequentially connected slag discharge pipes (200), characterized in that, The slag discharge pipe (200) includes an arc-shaped metal shell (201), a thermal insulation layer (202), and a ceramic liner (203) arranged sequentially from the outside to the inside. The arc-shaped metal shell (201) is located in the concrete trench foundation (100). The thermal insulation layer (202) is set on the inner wall of the arc-shaped metal shell (201). Several ceramic liners (203) are modularly assembled on the side of the thermal insulation layer (202) away from the arc-shaped metal shell (201). A locking mechanism (300) is installed on the slag discharge pipe (200). The arc-shaped metal shell (201) applies pre-compression stress to the thermal insulation layer (202) through the locking mechanism (300), so that the ceramic liner (203) is under pressure. The slag discharge pipe (200) has a top-opening structure, and a cover plate (400) for heat radiation protection is installed at the opening.

2. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 1, characterized in that, The locking mechanism (300) includes a baffle (301), a pre-embedded screw (302), and a locking nut (303). The pre-embedded screw (302) is located at the circumferential end of the thermal insulation layer (202). The ceramic lining plates (203) at the circumferential end and both circumferential ends of the thermal insulation layer (202) abut against the side of the baffle (301). The baffle (301) is provided with a through hole for the pre-embedded screw (302) to pass through. The locking nut (303) is threadedly sleeved with the part of the pre-embedded screw (302) that passes through the through hole.

3. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 1, characterized in that, The ends of the adjacent arc-shaped metal shells (201) are provided with protrusions (500), and fastening bolts (501) are provided between the corresponding protrusions (500).

4. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 2, characterized in that, The cover plate (400) includes an arc-shaped heat-insulating top plate (401) and a filling layer (402). The arc-shaped heat-insulating top plate (401) is disposed between two baffles (301). The arc-shaped heat-insulating top plate (401) has a hollow structure, and the filling layer (402) is disposed inside the arc-shaped heat-insulating top plate (401).

5. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 2, characterized in that, The ends of the arc-shaped metal shell (201) and the baffle (301) are welded together with end plates (600), and the end plates (600) are in contact with the heat insulation layer (202) and the ceramic liner (203) at both ends of the slag discharge pipe (200).

6. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 1, characterized in that, The concrete trench foundation (100) is filled with a curable and expandable grout (101).

7. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 1, characterized in that, An arc-shaped reinforcing plate (700) is provided at the gap between the outer wall of the slag discharge pipe (200) and the inner wall of the concrete trench foundation (100), and the arc-shaped reinforcing plate (700) is fitted between the gap to fix and lock the slag discharge pipe (200).

8. The prestressed metal-ceramic slag discharge ditch with thermal shock resistance according to claim 4, characterized in that, The bottom of the arc-shaped heat-insulating top plate (401) is coated with an anti-radiation coating (403).

9. A method for preparing a prestressed metal-ceramic slag discharge ditch with thermal shock resistance, used to prepare a prestressed metal-ceramic slag discharge ditch with thermal shock resistance as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Weld steel mesh to the inside of the arc-shaped metal shell (201) and pour lightweight insulating castable to form a thermal insulation layer (202). Step 2: The high-density ceramic liner (203) is obtained by isostatic pressing or slurry casting and sintering at high temperature. The surface of the ceramic liner (203) is roughened. Then the ceramic liner (203) is embedded into the inner side of the thermal insulation layer (202) and fixed by high-temperature ceramic adhesive or mechanical anchoring. Step 3: Install a locking mechanism (300) on the arc-shaped metal shell (201). Use the locking mechanism (300) to apply pre-compression stress to the thermal insulation layer (202) by the arc-shaped metal shell (201), so that the ceramic liner (203) is under pressure, thereby forming a slag discharge pipe (200) with an open top. Step 4: After assembling and connecting multiple slag discharge pipes (200) in sequence, install them in the concrete trench foundation (100). Use the cover plate (400) to cover the top opening of the slag discharge pipe (200) to form a slag discharge ditch.

10. The method for preparing a prestressed cermet slag discharge ditch with thermal shock resistance according to claim 9, characterized in that, During the initial heating and operation, the slag discharge pipe (200) can enable the thermal insulation layer (202) to be sintered and densified in situ, forming a lightweight thermal insulation ceramic layer.

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