Glossary
Materials and construction
Refractory (castable and brick)
Also known as refractory lining, castable refractory, refractory brick.
Refractory linings — castable cement-bonded mixes or pre-formed bricks — protect the steel shells of boilers, rotary kilns, calciners, waste-heat boilers and many other industrial vessels from high-temperature gas and slag attack.
Castable vs brick
- Castable refractory — mixed and poured or gunited in place, like concrete; quick installation, good for irregular shapes
- Brick refractory — pre-formed blocks laid in mortar; longest service life, used for the most demanding applications such as cement kiln burning zones
Why refractory matters for sonic-horn installation
Sonic horns are mounted on the steel shell, not on the refractory. Mounting locations must be chosen to avoid disrupting the refractory lining or creating a thermal-stress concentration. Horns mounted near refractory transitions, at kiln-shell penetrations or near burner clusters require detailed installation engineering to avoid initiating refractory failures.
Cleaning relevance
- Sonic horns do not damage refractory — the acoustic field is non-contact
- Aggressive water cannons and explosive deslagging can damage refractory through thermal shock or impact
Related terms
Related terms
- High-alumina refractoryHigh-alumina refractory bricks contain 60–95% Al2O3 and serve in the highest-temperature zones of cement kilns, lime kilns and metallurgical furnaces.
- Rotary kilnA rotary kiln is a long inclined rotating cylinder where preheated raw meal is burned at 1,450 °C to form clinker. The heart of every cement plant.
- Furnace (boiler)The furnace is the radiant chamber of a boiler where fuel burns at 1,300–1,700 °C. Waterwalls absorb the radiant heat; molten slag is the dominant fouling concern.
- WaterwallWaterwalls are panels of vertical evaporator tubes welded into a gas-tight membrane that line the furnace. They absorb radiant heat and produce most of the boiler's steam.