Hot blast stove is the blast furnace heating air equipment, is one of the main supporting equipment for ironmaking blast furnace, generally a blast furnace with 3 to 4 hot blast stoves, the role of the hot blast stove is to continuously provide the blast furnace with more than 1000 ℃ of high temperature hot air, advanced hot blast stove wind temperature can reach 1300 ℃.
According to the stove type, Hot blast stove has top-combustion, internal combustion type, external combustion type, etc. It usually consists of heat storage room, combustion room, burner, hot air duct, etc..
1. The lower part of the heat storage chamber: clay brick, heat-resistant concrete
2. The middle of the heat storage chamber: low creep clay bricks, high alumina bricks, low creep high alumina bricks
3. The upper part of the heat storage chamber: low creep high alumina bricks, silicon bricks
4. Combustion chamber: low creep high alumina bricks, silicon bricks
5. Burner: clay bricks, cordierite - mullite bricks
6. Hot air duct: low creep high alumina bricks
| Project | Clay brick | High alumina brick | Silica brick | low creep clay brick | Low creep high alumina brick | Cordierite-mullite brick |
| RN | RL | RG | RDN | RDL | RMJ | |
| Al2O3；% | ≥42 | ≥65 | / | ≥42 | ≥65 | ≥50 |
| SiO2；% | / | / | ≥94 | / | / | / |
| Fe2O3；% | ≤2.0 | ≤2.0 | ≤1.5 | ≤2.0 | ≤2.0 | ≤2.0 |
| Refractoriness；℃ | ≥1700 | ≥1750 | ≥1790 | ≥1750 | ≥1790 | ≥1750 |
| Apparent porosity；% | ≤24 | ≤22 | ≤22 | ≤22 | ≤21 | ≤25 |
| Bulk density；g/cm3 | ≥2.15 | ≥2.35 | ≥1.8 | ≥2.15 | ≥2.5 | ≥2.20 |
| Cold crushing strength；Mpa | ≥35 | ≥50 | ≥35 | ≥40 | ≥60 | ≥50 |
| 0.2MPa refractoriness-under-load/℃ | ≥1400 | ≥1500 | ≥1650 | ≥1420 | ≥1500 | ≥1420 |
| Creep rate；% （0.2Mpa,50h） |
/ | / | 1550℃ ≤0.8 |
1250℃ ≤0.8 |
1450℃ ≤0.8 |
1250℃ ≤0.8 |
| Permanent linear change on heating；% | 1300℃×2h 0～-0.4 |
1400℃×2h +0.1～-0.4 |
/ | 1400℃×2h +1～-0.2 |
1450℃×2h +0.2～-0.2 |
1350℃×2h +0.2～-0.2 |
| Thermal shock stability; times (1100℃, water cooling) | / | / | / | / | / | ≥70 |
| Real density；g/cm3 | / | / | ≤2.33 | / | / | / |
| Thermal expansion rate (1000℃)；% | / | / | ≤1.26 | / | / | / |
| residual quartz；% | / | / | ≤1.0 | / | / | / |
| Application | Lower part of regenerator | middle part of regenerator | Upper part of regenerator, combustion chamber | middle part of regenerator | Upper part of regenerator, hot air duct | burner |
| Item | Heat-resistant concrete | Spray paint |
Castable | Spray paint | Ceramic wear-resistant castable | Mullite mud | High alumina mud | clay mud | |
| YA | FL-130 | FN-130 | LT-Ja | TCJ-2 | MP-55 | LN-65 | NN-38 | ||
| Al2O3；% | ≥35 | ≥40 | ≥40 | ≥35 | ≥75 | ≥55 | ≥65 | ≥38 | |
| Bulk density；g/cm3 | ≥2.0 | ≥2.0 | ≥2.0 | ≥1.4 | ≥2.5 | / | / | / | |
| Cold crushing strength；Mpa | ≥20 | ≥20 | ≥30 | ≥20 | ≥70 | / | / | / | |
| Modulus of rupture；Mpa | ≥3.0 | ≥3.0 | ≥5.0 | ≥3.0 | ≥10 | / | / | / | |
| Room temperature bonding strength；Mpa | / | / | / | / | / | ≥2.0 | ≥1.0 | ≥1.0 | |
| bonding time；（min） | / | / | / | / | / | 1～2 | 1～2 | 1～2 | |
| Grain size；% | -1.0mm | / | / | / | / | / | ≥100 | ≥100 | ≥100 |
| -0.076mm | / | / | / | / | / | ≥60 | ≥50 | ≥50 | |
| Use part | Hearth foundation | Hot blast stove shell | Hot air stove drag coil | Hot stove flue | Hot air outlet, hot air duct | burner | Regenerator | Regenerator | |
Refractory materials for casting
Refractory materials for Blast furnace
Coking
Pretreatment of Liquid Iron
Ladle
