Refractory Mullite and Alumina Balls for Heat Storage Media
The regenerative balls are excellent refractory material. It has some remarkable characteristics
•Low linear shrinkage
•High load softening temperature under high temperature
•Excellent corrosion-resistant performance
•High strength
•Large heat storage and release
•Good thermal shock stability
•Good thermal conductivity
•Small thermal expansion coefficient
The regenerative balls are applicable to the selection of the heat storage ball combustion system of gas and non gas fuel industrial furnaces. It is especially suitable for the steel industry virtual heating furnace, regenerative ladle roaster, air separation equipment heat accumulator in the air separation industry, and regenerative smelting furnace in the nonferrous metal industry. At the same time, it can also be used as a heat storage carrier in large forging plants, regenerative trolley furnaces, regenerative electric boilers, regenerative incinerators and other industries.
|
Item |
|
SP-I |
SP-II |
SP-III |
SP-IV |
| Al2O3 |
% |
≥65 |
≥70 |
≥75 |
≥85 |
| Fe2O3 |
% |
≤1.5 |
≤1.2 |
≤1 |
≤1 |
| Apparent porosity |
% |
22 |
22 |
23 |
23 |
| Bulk density |
g/cm3 |
2.2 |
2.3 |
2.8 |
2.8 |
| Volume-weight |
Kg/m3 |
1400-1500 |
1400-1600 |
1500-1650 |
1600-1700 |
| Specific surface area |
m2/m3 |
200-220 |
|||
| Thermal expansion coefficient |
x10-6 /℃ |
5 |
5.5 |
6 |
7 |
| Reference value of specific heat capacity |
x103/Kg K |
1.1 |
1.1 |
1.2 |
1.3 |
| 1100 ℃ water cooling |
Times |
≥30 |
≥30 |
≥30 |
≥20 |
| Applicable temperature |
℃ |
≤1450 |
≤1550 |
≤1650 |
≤1750 |
