Hole design of six petal quincuncial hole hot-air stove burning grate

Abstract

The invention relates to iron-smelting furnace hot blast furnace grate system field, especially hole-shape design of a six-piece quincunx-shape hole hot-blast furnace grate. Seven closed arranged round holes on hot-blast furnace grate corresponding to iron-casting grid blocks and lattice bricks are integrated to six-piece quincunx-shape holes. The section of the place connected with furnace grate on cross beam is reduced , The ventilating holes at the place connected with the cross beam are made in to six-piece quincunx-shape holes; 8-shape holes etc. and arranged and combined them to variable form and size six-piece-shape hole furnace grate, The hot-blast Furnace is designed to corresponding structural form.

Description

technical field [0001] The invention relates to the technical field of design, manufacture, installation, commissioning, and use of a grate system for a hot blast stove in an ironmaking blast furnace, in particular to the design of a six-petal plum blossom hole hot blast stove grate. Background technique [0002] The hot blast stove is the main equipment of the air supply system of the ironmaking blast furnace. It is a blast heating facility stacked with checker bricks. As a carrier of high-temperature heat, checker bricks absorb and store heat during the combustion period of the hot blast stove, and release heat to heat the blast during the air supply period. By reducing the hole diameter of checker bricks, the heating area of ​​checker bricks for hot blast stoves can be increased to ensure sufficient heat exchange per unit time; the volume of regenerators for checker bricks for hot blast stoves can be increased to ensure the necessary heat storage capacity and improve blas...

AI Technical Summary

Problems solved by technology

[0004] 1) The ring at the lower part of the cast iron grid block and the diamond-shaped (hexagonal) grid hole of the furnace grate can only limit the displacement in the horizontal direction, but cannot limit the rotation of the cast iron grid block in the axial direction. The furnace grate is heated and expands and displaces, which drives the cast iron grid block to rotate, resulting in the displacement and damage of the grid brick;

[0005] 2) The diamond-shaped hole furnace grate (or hexagonal mesh hole furnace grate) has different strengths in each direction. During the manufacturing and use process, the shrinkage and expansion of each direction with temperature changes are different, which is easy to cause deformation. , Cracking problem, difficult to manufacture, short service life;

[0006] 3) The grate with diamond holes (the grate with hexagonal mesh holes) has a sharp corner connection at the intersection of the grid hole connecting ribs, and there are problems of deformation and cracking during the manufacturing and use process. The structural stability of the grate is poor and the strength is poor. , Low bearing capacity, mostly used in medium and small blast furnaces;

[0007] 4) At the intersection of diamond-shaped grid holes (hexagonal grid holes), the cast iron grid block is unstable, and the cast iron grid block and the grid bricks on the upper part may be tilted and displaced, which will affect the stability of the system;

[0008] 5) There are a large number of intersections and overlaps between the grid hole connecting ribs of the diamond-shaped hole furnace grate (hexagonal grid hole furnace grate) and the grid holes of the cast iron grid block on the upper part, and the ventilation hole grid holes of the cast iron grid block are partially blocked, affecting ventilation effect;

[0009] 6) On the round edge of the hot blast stove, ventilation holes cannot be designed at the connecting ribs added to increase the structural strength of the diamond-shaped hole furnace grate (or hexagonal mesh hole furnace grate), and the upper part of the cast iron grid block and grid bricks should be lowered. ventilation effect;

[0010] 7) A large number of △-shaped ventilation holes with small cross-sections are distributed on the hexagonal grid hole furnace grate, which is difficult to cast and produce. The △-shaped ventilation holes at the contact with the beam will be blocked, which will affect the ventilation effect

However, due to the small section size of the three-lobed plum blossom-shaped ventilation holes, the positioning of the cast iron grid blocks is difficult to achieve

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