Industries · Kilns
High Emissivity Coatings for Industrial Kilns
Tunnel kilns·intermittent and batch kilns·rotary cement and lime kilns·afterburners
Kiln economics are set by cycle time and fuel per fired unit. Emisshield raises kiln lining emissivity to at least 0.96 (M-6) so burner energy is re-radiated into the ware instead of the exhaust, with efficiency gains of 8 to 10% on continuous kilns and up to 15% on intermittent kilns across Emisshield's kiln installations, plus shorter heat-up and steadier zone control. ROI is typically under a year.
How High Emissivity Coatings Help a Kiln Operation
- 8 to 10%
- Efficiency gain, continuous kilns
- Up to 15%
- Efficiency gain, intermittent kilns
- Shorter
- Heat-up from cold
- Under a year
- Typical ROI
A kiln fires ware by radiation from its lining, and the lining is refractory or fiber at 0.3 to 0.4 emissivity. A large share of burner energy reflects into the exhaust instead of the setting, so heat-up runs long, the firing and soak zones hold with more fuel than they need, the gradient between the car load's outer and inner ware produces inconsistent product, and afterburners burn supplemental fuel to hold compliance temperature. In cyclic service, every heat-up and cool-down wears the lining a little more.
Emisshield converts the lining into a re-radiator aimed at the ware. Zones reach setpoint faster and hold with less firing, the setting fires more evenly across its width, and afterburners hold temperature with less supplemental fuel because the chamber re-radiates rather than reflects. The coating's thermal-shock tolerance, from -236°C to 1,500°C in 3 seconds, protects the lining through every cycle, and coated fiber holds shrinkage under 1%.
Because radiant share rises with temperature, coating can be limited to the zones where the economics are strongest, typically firing and soak. Continuous kilns show 8 to 10% efficiency improvement; intermittent kilns, which include a heat-up from cold every cycle, gain the most at up to 15%. Formulations bond at a strength of at least 10,000 PSI and tolerate the mechanical and thermal cycling of rotary cement and lime kilns.
Where Emisshield Is Applied in Kilns
- 5
- Application areas
- Zone by zone
- Selective application where the return is highest
- Clemson
- Independent pilot-scale kiln study
Ceramics, brick, refractory shapes, cement, and lime all fire by radiation, and the higher the temperature, the larger the radiant share the coating governs.
01Continuous tunnel kilns
Firing and soak zones coated selectively for lower fuel per fired ton and a smaller outer-to-inner ware gradient across the car load.
02Intermittent and batch kilns
Full lining coated to shorten heat-up from cold and protect the refractory through every cycle; the largest documented gains.
03Rotary cement and lime kilns
Refractory coated with formulations that tolerate rotation and thermal cycling; results projected per kiln from assessment data.
04Afterburners
Chamber surfaces coated to hold compliance temperature with less supplemental firing.
05Fiber-lined kilns
Coated ceramic fiber holds shrinkage under 1% and tolerates continuous duty roughly 150°C higher, per third-party testing.
FAQ
Common Questions From Kiln Operators
Which kilns benefit most?
Any kiln where radiation dominates: ceramics, brick, cement, and lime all qualify. The higher the temperature, the larger the radiant share.
Can just the soak zone be coated?
Yes. Zones can be coated selectively where the economics are strongest.
What about rotary kilns' moving lining?
Formulations bond at a strength of at least 10,000 PSI and tolerate rotation; cement and lime applications are established.
How fast is payback?
Kiln results in the 8 to 15% range typically pay back inside a year; the fuel bill sets the exact figure.
Next step
Which Zone Carries Your Fuel?
Send us the kiln type, cycle, and fuel data. We project the saving from comparable installations.