The castables have such features as easy
installation, good early, middle and high temperature strengths, being able to
be demolded after natural curing for 16～24h after placement,
strength increasing with temperature rising and good resistance to high velocity
as flow erosion and dust attack.
An in-construction CFB boiler for which abrasion resistant castables are used
Properties specification of abrasion-resistant castables for CFB boiler
Type | NM-1 （Steel fiber wear-resistant castable） | NM-2 (High aluminum wear-resistant castable） | NM-3 (wear-resistant and thermal shock-resistant castable) | |
Chemical analysis （%） | Al2O3 ≥ | 85 | 80 | 65 |
SiO2 ≤ | 11 | 18 | 20 | |
Bulk density（g/cm3） | 110℃×24h≥ | 2.80 | 2.70 | 2.50 |
1100℃×3h≥ | 2.70 | 2.60 | 2.45 | |
Permanent change（%） | 1100℃×3h | -0.3~0 | -0.3~0 | -0.5~+0.5 |
Modulus of rupture Mpa | 110℃×24h≥ | 15 | 10 | 8 |
1100℃×3h≥ | 20 | 20 | 12 | |
Compressive strength Mpa | 110℃×24h≥ | 90 | 90 | 60 |
1100℃×3h≥ | 110 | 110 | 80 | |
Thermal shock stability,time | 1100℃，水冷≥ | 25 | 20 | 30 |
Wear resistance index, CC | ASTM C-704 | ≤6 | ≤8 | — |
Service temperature，℃ ≥ | 1600 | 1600 | 1500 | |
Use area
| Separator straight section, inlet, outlet, cone section, material leg, return device | Dense phase area and transition area of combustion chamber, elbow at the bottom of water cooling screen, turning room at cyclone outlet, tail shaft
| Ignition air duct, water-cooled air chamber
| |
