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Ash & pneumatic conveying
Fly ash, bottom ash slurry, cement raw meal, clinker dust and coal fines wear conveying lines at bends and diverters. In these duties temperature decides whether tiles can be bonded or must be held mechanically.
Temperature decides the fixing
In ash and powder handling the first question is temperature, and the second is how quickly it changes. Alumina tolerates high steady temperatures; adhesives and rapid swings are what limit a design.
| Duty | Usually fits | Why |
|---|---|---|
| Bottom ash slurry, near ambient | Bonded or welded tiles in steel pipe | Wet abrasion; adhesives work at this temperature |
| Pneumatic conveying of cool powders | Bonded tiles or inserted tubes | Sliding abrasion at bends and diverters |
| Hot fly ash near collection points | Welded tiles or inserted tubes; bonded only if the adhesive rating covers the maximum temperature | The adhesive is the weak link, not the alumina |
| Flue gas desulphurisation (wet, corrosive) | Weld-on tiles with studs suited to the chemistry | Keeps tiles in place in wet, fluctuating conditions |
| Hot gas ducts with temperature swings, e.g. 600–900 °C | Often a refractory lining rather than alumina tiles | Thermal shock risk — we will say so |
Bends and diverters
In pneumatic lines the outer radius of bends and the faces of diverters take most of the wear. Lined bends with a heavier lining on the outer radius, or ceramic-lined fittings, are usually the first step.
What to send us
- MaterialFly ash, bottom ash, raw meal, coal fines …
- TemperatureMaximum, normal and rate of change
- ConveyingDense or dilute phase; velocity and pressure
- PipeSize, wall thickness, flange standard
- LayoutBend angles and radii, diverters
- HistoryCurrent lining and where it fails
Questions
Our ash is about 400 °C. Can tiles be bonded?
Only if the adhesive’s rating covers that temperature with margin, and most standard adhesives do not. We usually propose welded tiles or inserted tubes and confirm the method with the factory engineer.
Can alumina line a hot flue gas duct?
Steady high temperature is not the problem; rapid swings are. Ducts that cycle between ambient and several hundred °C are often better served by a refractory lining. Send the temperature profile and gas composition and we will tell you which way we would go.
Send the duty conditions.
We recommend the lining, state where it stops working, and quote once the parameters are confirmed.
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