Checker brick is widely recognized and accepted by the world’s ironmaking industry. It is a kind of excellent thermal characteristics heat accumulator with characteristics of strong heat exchange capacity, large heat storage area, smooth ventilation, and small resistance. Checker Refractory Bricks for Hot-Blast Stove is a heat transfer medium. It is applied in the regenerator of blast furnace hot blast stove, usually ordered arrangement in the regenerator, and it plays a role in heat storage during the burning period. During the “air supply period”, the cold air is heated into hot air through convection heat exchange and radiant heat exchange. Contact Rongsheng refractory factory for the cheap prices.
Characteristics of Checker Bricks
- It has a plurality of open lattice holes parallel to the side surface, as well as the positioning bulge and positioning grooves on the two parallel surfaces.
- High volume stability, high load creep performance, high density, and low porosity. The modern blast furnace of blast furnace usually adopts the structure of the lattice brick(checker bricks) regenerator.
Physical and Chemical Index of Checker Brick
| Refractory Fireclay Checker Brick | |||
| Item | Unite | Index | |
| HLG | LLG | ||
| Al2O3 | % | ≥50 | ≥45 |
| Fe2O3 | % | ≤1.6 | ≤1.6 |
| Refractoriness | ℃ | ≥1600 | ≥1600 |
| Apparent Porosity | % | ≤22 | ≤24 |
| Bulk Density | g/cm3 | ≥2.45 | ≥2.35 |
| Cold Crushing Strength | MPa | ≥80 | ≥60 |
| Refractoriness Under Load (0.2MPa) | ℃ | ≥1500 | ≥1400 |
| Permanent Linear Change (1500℃*2h) | % | ±0.2 | ±0.2 |
Application of Checker Bricks
At present, checker bricks are mainly used in the blast furnace hot blast stove, and flame furnace.
The checker brick is mainly used in the regenerator of the hot blast stove. The checker brick with a certain checkerwork cell is arranged in order, and the upper and lower holes of the checker brick can be allowed to pass through the gas. According to the technology requirements of different temperature areas, generally, select siliceous checker brick, and clay brick, in some blast furnaces, also have the option of high alumina brick, mullite bricks, sillimanite brick, etc.
The effect of the hot-blast stove is to heat cold wind sent by the air-blower into the hot wind, and then the hot air is sent through the hot air pipe to the blast furnace for combustion. The blast furnace hot blast stove has the period of burning and the air supply, and the two working periods are periodically rotated. During the burning period, the high-temperature smoke after burning passes through the holes of the checker bricks of the hot blast stove and transfers heat to the checker bricks. During the air supply period, the cold air coming from the blower comes into the hot stove and is heated by the checker bricks into hot air, and then sent to the blast furnace by hot air ducts.
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