A high-temperature screen lower end fixing mechanism that can effectively prevent the wear-resistant casting layer from falling off.

Abstract

This utility model discloses a high-temperature screen lower end fixing mechanism that can effectively prevent the wear-resistant casting layer from falling off, solving the problem of how to improve the bonding force between the tube bundle lower end 90° bend and the wear-resistant casting layer; annular fins (6) are provided at intervals on the outer wall of each superheater tube (5) of the high-temperature superheat screen (2), and square upward-extending fins (7) and square downward-extending fins (8) are provided at intervals on the annular fins (6); the annular fins (6), the square upward-extending fins (7) and the square downward-extending fins (8) are all cast in the wear-resistant casting layer (4); effectively preventing the wear-resistant casting layer from falling off.

Description

Technical Field

[0001] This utility model relates to a sintering flue gas purification device and a residual heat recovery boiler, and particularly to a fixing mechanism at the lower end of a high-temperature screen in the furnace of the sintering flue gas purification device and the residual heat recovery boiler that can effectively prevent the wear-resistant casting layer from falling off. Background Technology

[0002] The high-temperature superheater in the sintering flue gas purification device and residual heat recovery boiler furnace consists of several tube bundles. The upper ends of the high-temperature superheater tube bundles are suspended from the boiler's top beam, and the lower ends extend outwards from the furnace body after a 90-degree turn. The lower part of the high-temperature superheater tube bundles is covered by a wear-resistant cast-in-place layer to resist the scouring and abrasion of the lower ends of the tube bundles by the flue gas in the furnace. Therefore, a good bond is required between the lower part of the high-temperature superheater tube bundles and the wear-resistant cast-in-place layer to prevent the wear-resistant cast-in-place layer from falling off. Current technology involves placing a tube bundle at each end of the tube bundle... The outer side of the tube is densely covered with welded pins, which, through their bonding with the wear-resistant cast layer, achieve the above objectives. However, this structure has the drawback of limited bonding strength between the pins and the wear-resistant cast layer. Under the high-temperature environment inside the furnace, the scouring effect of the high-temperature flue gas can easily cause the cast layer to detach at the 90° bend at the lower end of the tube bundle, resulting in the lower 90° bend of the tube bundle being exposed to the flue gas inside the furnace, causing wear and breakage of the tube bundle. How to improve the bonding strength between the lower 90° bend of the tube bundle and the wear-resistant cast layer has become a problem that needs to be solved in boiler operation. Summary of the Invention

[0003] This invention provides a high-temperature screen lower end fixing mechanism that can effectively prevent the wear-resistant casting layer from falling off, and solves the technical problem of how to improve the bonding force between the lower end of the tube bundle at the 90° bend and the wear-resistant casting layer.

[0004] This utility model solves the above technical problems through the following technical solution: A high-temperature screen lower end fixing mechanism that can effectively prevent wear-resistant cast-in-place layer from falling off includes a furnace chamber, in which a high-temperature superheater screen is installed. The upper end of the high-temperature superheater screen extends out of the top of the furnace chamber and is hung on the top beam. The lower end of the high-temperature superheater screen extends out to the outside of the furnace chamber after a 90-degree turn. A wear-resistant cast-in-place layer is installed at the lower end of the high-temperature superheater screen. Annular fins are spaced apart on the outer wall of each superheater tube of the high-temperature superheater screen. Square upward-extending fins and square downward-extending fins are spaced apart on the annular fins. The annular fins, square upward-extending fins, and square downward-extending fins are all cast in the wear-resistant cast-in-place layer.

[0005] The annular fins are formed by welding the left and right half-annular fins together onto the outer wall of the superheater tube.

[0006] The square upward-extending fins are formed by stamping. After being stamped, the square upward-extending fins curl outwards from the surface of the annular fin plate, forming a dovetail shape. At the same time, square through holes are formed on the surface of the annular fin plate.

[0007] This invention features densely spaced annular fins on the outer wall of the superheated tube, and square fins stamped out on both sides of the annular fins. These dovetail-shaped square fins can be well bonded to the wear-resistant casting layer, effectively preventing the wear-resistant casting layer from falling off. Attached Figure Description

[0008] Figure 1 is a structural schematic diagram of the high-temperature overheating screen 2 of this utility model; Figure 2 This is a schematic diagram of the structure of the superheater tube 5 with annular fins 6 of this utility model; Figure 3 This is a schematic diagram of the structure of the annular fin 6 of this utility model; Figure 4 This is a schematic diagram of the structure of the left half-annular piece 9 and the right half-annular piece 10 of this utility model. Detailed Implementation

[0009] The present invention will now be described in detail with reference to the accompanying drawings: A high-temperature screen lower end fixing mechanism that effectively prevents the wear-resistant cast layer from falling off includes a furnace chamber 1, a high-temperature superheated screen 2 installed in the furnace chamber 1, the upper end of the high-temperature superheated screen 2 extending out of the top of the furnace chamber and hanging on the top beam 3, and the lower end of the high-temperature superheated screen 2 extending out to the outside of the furnace chamber 1 after a 90-degree turn. A wear-resistant cast layer 4 is installed at the lower end of the high-temperature superheated screen 2, and the lower end of the high-temperature superheated screen 2 is cast in the wear-resistant cast layer 4. Wear-resistant cast layers are spaced apart on the outer wall of each superheater tube 5 of the high-temperature superheated screen 2. The annular fins 6 are densely distributed on the outer wall of the superheater tube 5. Square upward-extending fins 7 and square downward-extending fins 8 are arranged at intervals on the annular fins 6. The square upward-extending fins 7 are connected to the substrate of the annular fins 6 and protrude outwards, so that the annular fins with the protruding fins form a ground anchor structure, which plays the role of anchoring with the wear-resistant casting layer 4. The annular fins 6, the square upward-extending fins 7 and the square downward-extending fins 8 are all cast in the wear-resistant casting layer 4.

[0010] The annular fin 6 is formed by welding the left half-annular fin 9 and the right half-annular fin 10 together to the outer wall of the superheater tube 5; therefore, it is designed as a two-piece type to facilitate the installation of the annular fin 6. Since the high-temperature superheater screen 2 is composed of densely arranged superheater tubes 5, the gap between two adjacent superheater tubes 5 is limited, and the two-piece annular fin 6 facilitates the installation.

[0011] The square upward-extending fin 7 is formed by stamping. After being stamped, the square upward-extending fin 7 curves outward from the surface of the annular fin 6 to form a dovetail shape. At the same time, square through holes 11 are formed on the surface of the annular fin 6. These square through holes 11 also increase the bonding force between the annular fin 6 and the wear-resistant casting layer 4.

Claims

1. A high-temperature screen lower end fixing mechanism that can effectively prevent wear-resistant cast layer from falling off, comprising a furnace (1), a high-temperature superheated screen (2) provided in the furnace (1), the upper end of the high-temperature superheated screen (2) extending out of the top of the furnace and hanging on the top beam (3), the lower end of the high-temperature superheated screen (2) extending out to the outside of the furnace (1) after a 90-degree turn, and a wear-resistant cast layer (4) provided at the lower end of the high-temperature superheated screen (2), characterized in that, On the outer wall of each superheater tube (5) of the high-temperature superheater screen (2), there are annular fins (6) spaced apart. On the annular fins (6), there are square upward-extending fins (7) and square downward-extending fins (8) spaced apart. The annular fins (6), the square upward-extending fins (7) and the square downward-extending fins (8) are all cast in the wear-resistant casting layer (4).

2. A high temperature shield lower end fixing mechanism effective to prevent the abrasion resistant cast layer from falling off according to claim 1, characterized in that, The annular fin (6) is formed by welding the left half-annular fin (9) and the right half-annular fin (10) together onto the outer wall of the superheater tube (5).

3. The high-temperature screen lower end fixing mechanism according to claim 2, which can effectively prevent the wear-resistant casting layer from falling off, is characterized in that, The square upward-extending fin (7) is formed by stamping. After being stamped, the square upward-extending fin (7) protrudes outward from the surface of the annular fin (6) to form a swallowtail shape. At the same time, a square through hole (11) is formed on the surface of the annular fin (6).

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