Search

CN-122012833-A - Prestressed metal ceramic slag runner with thermal shock resistance and preparation method thereof

CN122012833ACN 122012833 ACN122012833 ACN 122012833ACN-122012833-A

Abstract

The invention discloses a prestressed metal ceramic slag discharge ditch with thermal shock resistance and a preparation method thereof, relating to the technical field of blast furnace slag discharge, wherein the device comprises: the concrete trench foundation and a plurality of slag discharging pipes that link to each other in proper order, the slag discharging pipe includes from outside to interior arc metal casing, heat preservation insulating layer and the ceramic welt that distributes in proper order, and arc metal casing is located the concrete trench foundation, and heat preservation insulating layer sets up the inside wall at arc metal casing, and a plurality of ceramic welt modularization is assembled in heat preservation insulating layer one side of keeping away from arc metal casing, installs locking mechanism on the slag discharging pipe, and arc metal casing applies precompression stress to heat preservation insulating layer through locking mechanism, makes ceramic welt be in the compressed state. The invention adopts a three-layer composite prestress structure, so that the ceramic lining plate is stressed and resists thermal shock, has the performances of heat preservation, wear resistance and corrosion resistance, effectively reduces heat loss, prevents cracking, and remarkably prolongs the service life of the slag runner.

Inventors

  • JIA XIYONG
  • JIA XICHENG
  • CAO LONGBO
  • LV YANG
  • JIA PEIXIANG

Assignees

  • 安徽鑫永晟微晶材料有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The utility model provides a prestressed metal pottery slag runner with thermal shock resistance, includes concrete trench foundation (100) and a plurality of slag discharging pipe (200) that link to each other in proper order, its characterized in that, slag discharging pipe (200) are including arc metal casing (201), heat preservation insulating layer (202) and ceramic welt (203) that distribute in proper order from outside to inside, arc metal casing (201) are located concrete trench foundation (100), heat preservation insulating layer (202) set up the inside wall at arc metal casing (201), a plurality of ceramic welt (203) modularization are assembled in one side that heat preservation insulating layer (202) kept away from arc metal casing (201), install locking mechanism (300) on slag discharging pipe (200), arc metal casing (201) are through locking mechanism (300) to heat preservation insulating layer (202) apply precompression stress, make ceramic welt (203) be in the pressurized state, slag discharging pipe (200) are top opening structure, and the opening part is installed and is used for protecting against heat radiation apron piece (400).
  2. 2. The prestressed metal ceramic slag runner with thermal shock resistance according to claim 1, wherein the locking mechanism (300) comprises a baffle plate (301), an embedded screw rod (302) and a locking nut (303), the embedded screw rod (302) is arranged at the circumferential end part of the heat insulation layer (202), the circumferential end part of the heat insulation layer (202) and ceramic lining plates (203) at the circumferential two ends are in contact with the lateral part of the baffle plate (301), through holes for the embedded screw rod (302) to pass through are correspondingly formed in the baffle plate (301), and the locking nut (303) is in threaded sleeve joint with part of the embedded screw rod (302) passing through the through holes.
  3. 3. The prestressed cermet slag runner with thermal shock resistance according to claim 1, characterized in that the end of the adjacent arc-shaped metal shell (201) is provided with protrusions (500), and fastening bolts (501) are installed between the corresponding protrusions (500).
  4. 4. The prestressed cermet slag runner with thermal shock resistance according to claim 2, wherein the cover plate member (400) comprises an arc-shaped heat insulation top plate (401) and a filling layer (402), the arc-shaped heat insulation top plate (401) is arranged between the two baffles (301), the arc-shaped heat insulation top plate (401) is of a hollow structure, and the filling layer (402) is arranged in the arc-shaped heat insulation top plate (401).
  5. 5. The prestressed metal ceramic slag runner with thermal shock resistance according to claim 2, wherein end plates (600) are welded together at the ends of the arc-shaped metal shell (201) and the baffle plates (301), and the end plates (600) are abutted against the heat preservation and insulation layers (202) and the ceramic lining plates (203) at the two ends of the slag discharging pipe (200).
  6. 6. The prestressed cermet slag runner with thermal shock resistance according to claim 1, characterized in that a curable and expandable grouting material (101) is poured into the concrete runner foundation (100).
  7. 7. The prestressed metal ceramic slag runner with thermal shock resistance according to claim 1, wherein an arc-shaped reinforcing plate (700) is arranged at a gap between the outer pipe wall of the slag runner (200) and the inner side wall of the concrete runner foundation (100), and the arc-shaped reinforcing plate (700) is wedged between the gaps for fixing and locking the slag runner (200).
  8. 8. The prestressed cermet slag runner with thermal shock resistance according to claim 4, characterized in that the bottom of the arc-shaped heat insulation top plate (401) is coated with a back-radiation coating (403).
  9. 9. A method for preparing a prestressed cermet slag runner with thermal shock resistance, which is used for preparing the prestressed cermet slag runner with thermal shock resistance according to any one of claims 1-8, and is characterized by comprising the following steps: welding a reinforcing mesh on the inner side of an arc-shaped metal shell (201), and pouring a light heat-insulating casting material to form a heat-insulating layer (202); Step two, adopting isostatic compaction or slip casting, preparing a high-density ceramic lining plate (203) through high-temperature sintering, coarsening the surface of the high-density ceramic lining plate, embedding the ceramic lining plate (203) into the inner side of a heat preservation and insulation layer (202), and fixing the ceramic lining plate by adopting a high-temperature ceramic adhesive or mechanical anchoring mode; Installing a locking mechanism (300) on the arc-shaped metal shell (201), and applying precompression stress to the heat insulation layer (202) by the arc-shaped metal shell (201) by using the locking mechanism (300) to enable the ceramic lining plate (203) to be in a pressed state, so as to form a slag discharging pipe (200) with an opening at the top; And fourthly, installing a plurality of slag discharging pipes (200) in the concrete trench foundation (100) after sequentially assembling and connecting, and covering the top opening of the slag discharging pipes (200) by using a cover plate (400) to form a slag discharging trench.
  10. 10. The method for preparing the prestressed cermet slag runner with thermal shock resistance according to claim 9, wherein the slag discharging pipe (200) can enable the heat preservation and insulation layer (202) to realize in-situ sintering densification during the first heating operation process to form the light heat preservation and ceramic insulation layer.

Description

Prestressed metal ceramic slag runner with thermal shock resistance and preparation method thereof Technical Field The invention relates to the technical field of blast furnace slag removal, in particular to a prestressed metal ceramic slag removal ditch with thermal shock resistance and a preparation method thereof. Background In the blast furnace ironmaking process, a large amount of high-temperature slag is generated in addition to molten iron. These slag consists mainly of gangue, ash, fluxes, etc., with temperatures as high as 1450-1600 ℃, with sensible heat taking up a considerable proportion of the total output heat of the blast furnace. Blast furnace slag is usually treated by a hydraulic slag flushing or bottom filtering method, and high-temperature slag is quenched and granulated into glassy slag which is used as a cement mixture or a building material. In the treatment flow, the slag discharging groove is used as a key channel for connecting a slag outlet of the blast furnace with granulating equipment, and bears the stable conveying function of high-temperature slag, and the operation reliability of the slag discharging groove is directly related to the continuity and safety of the blast furnace production. At present, a blast furnace slag notch commonly adopts a V-shaped water cooling structure, a ditch body is formed by welding steel plates, and refractory materials or wear-resistant lining plates are paved inside the ditch body. However, the conventional structure has the defects that firstly, the V-shaped structure is easy to generate serious thermal stress concentration when heated and severe temperature fluctuation caused by intermittent discharge of high-temperature slag causes frequent cracking of a ditch body, the service life is short, secondly, the water cooling structure is fast in heat dissipation and poor in heat preservation performance, a large amount of heat loss is caused, and the development direction of energy conservation and carbon reduction in the current steel industry is contrary, and thirdly, the conventional wear-resistant lining plate material is difficult to meet the performance requirements of high-temperature strength, thermal shock resistance and low thermal conductivity at the same time, so that the conventional wear-resistant lining plate material is often lost. Disclosure of Invention The invention provides a prestressed metal ceramic slag runner with thermal shock resistance and a preparation method thereof, which can solve the problems of high thermal stress concentration, high thermal loss, insufficient wear resistance and corrosion resistance and unfavorable stable conveying of slag in a V-shaped water-cooling slag runner structure in the prior art. The aim of the invention can be achieved by the following technical scheme: The invention provides a prestressed metal ceramic slag runner with thermal shock resistance, which comprises a concrete runner foundation and a plurality of slag discharging pipes sequentially connected, wherein each slag discharging 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 positioned in the concrete runner foundation, the heat preservation and insulation layer is arranged on the inner side wall of the arc-shaped metal shell, the ceramic lining plates are modularly assembled on one side, far away from the arc-shaped metal shell, of the heat preservation and insulation layer, a locking mechanism is arranged on each slag discharging pipe, the arc-shaped metal shell applies precompression stress to the heat preservation and insulation layer through the locking mechanism, so that the ceramic lining plates are in a pressed state, the slag discharging pipes are of a top end opening structure, and cover plate pieces for preventing heat radiation are arranged at openings. The locking mechanism comprises a baffle, an embedded screw and a locking nut, wherein the embedded screw is arranged at the circumferential end part of the heat insulation layer, the circumferential end part of the heat insulation layer and ceramic lining plates at the two ends in the circumferential direction are in contact with the side parts of the baffle, through holes for the embedded screw to pass through are correspondingly formed in the baffle, and the locking nut is in threaded sleeve joint with part of the embedded screw passing through the through holes. As a further scheme of the invention, the end parts of the adjacent arc-shaped metal shells are provided with the bulges, and the fastening bolts are arranged between the corresponding bulges. As a further scheme of the invention, the cover plate comprises an arc-shaped heat-insulating top plate and a filling layer, wherein the arc-shaped heat-insulating top plate is arranged between two baffles, the arc-shaped heat-insulating top plate is of a hollow structur