Technology · Energy Savings
Energy Savings from High Emissivity Coatings
High emissivity coatings reduce fuel consumption by redirecting radiant energy into the product instead of losing it with the flue gas. Documented Emisshield results range up to 15%, with most sourced cases between 4 and 12% depending on the asset, fuel, and baseline condition, and ROI typically under a year. The table below lists every published energy result on this site, each linked to its case study.
01
How much fuel does a high emissivity coating save?
Across 500+ coated facilities, documented savings run from about 4% on already well-tuned equipment to 12% on large fired heaters, with the upper range reached where linings were low-emissivity and heat flux was uneven before coating. The same duty is met at a lower firing rate because more of each BTU reaches the load. Savings are measured against the plant's own baseline, and every figure below comes from that comparison.
02
Documented energy results by industry and asset
| Industry | Asset | Case study | Energy result | Other measured effects |
|---|---|---|---|---|
| Hydrocarbon & Chemical | Ethylene cracker (IFB, fiber modules) | Huntsman, Texas | 12% fuel reduction | ~$1.5M/yr saving, fiber shrinkage <1%, exterior temperature down >66°C |
| Hydrocarbon & Chemical | Ethylene furnace | Eastman, Texas | 6% fuel reduction | +9% production |
| Hydrocarbon & Chemical | EDC/VCM cracking furnace | SABIC, Saudi Arabia | 2 to 6% energy savings | +10% cracking rate; two more furnaces coated since |
| Hydrocarbon & Chemical | Sulfur furnace (castable) | LaPorte, Texas | 5% fuel savings | Lower shell temperature, longer refractory life |
| Hydrocarbon & Chemical | Steam-cracking pilot furnace | Ghent University, IMPROOF | 4.8% fuel reduction measured; 7 to 12% modeled at full scale | Emissivity ~0.4 to ~0.95 confirmed by independent lab |
| Hydrocarbon & Chemical | Primary ammonia reformer | CSBP, Australia | Reduced fuel and maintenance cost | +5% production, bridge wall below alarm |
| Iron & Steel | Shot-ball quench furnace | Seoul Shot, South Korea | 10.7% fuel savings | Heat-up 4h56 to 2h43, +16.6% production |
| Iron & Steel | Aluminium melting-holding furnace | India's largest aluminium producer | 12% better heat retention | +545 t/month, dross down 10% |
| Iron & Steel | Water-cooled EAF roof | Confidential mill, USA | 3 minutes less arc time per melt | 500 to 940 heats, no water leaks |
| Power Generation | Gas-fired process boiler | Apache Nitrogen | 4 to 5% less natural gas | +15 to 20% steam, maintenance 9 to 24+ months |
| Power Generation | Biomass CHP boiler | E.ON, Mora, Sweden | 10% lower fuel load | +10% steam, NOx down 25%, CO down 45%, CO2 down 10% |
| Power Generation | HRSG duct burner zone | Combined-cycle plant | Reached operating temperature 22% faster | Particulate down 20% |
| Ethanol | DDGS rotary dryers and RTO | Midwest ethanol plant | 7% improvement in natural gas yield (plant), 15% on Dryer A | VOC down 20% |
| Ethanol | Regenerative thermal oxidizer | Midwest USA | 1,209 BTU/gal improvement | Excess air and NOx down 5.2% |
| Glass | Melting furnace crown | Wool fiberglass plant | 5% energy savings | Sustained 36+ months |
| Crematories | Cremation unit, main and afterburner chambers | Cremkote coated crematory | 21% energy savings | Faster cycles, ROI under one year |
| Kilns | Tunnel and intermittent kilns | Emisshield kiln installations | 8 to 10% continuous, up to 15% intermittent | Faster heat-up, steadier zones |
03
Why do savings vary from asset to asset?
Three variables set the result. Baseline emissivity: a ceramic-fiber lining at ~0.3 gains more than an oxidized steel surface at ~0.6. Radiant share: the hotter the process, the larger the fraction of heat transferred by radiation and the more the surface governs. Control response: savings appear as a lower firing rate only when burners are turned down to hold the same outlet or product temperature; where operators hold fuel constant instead, the same effect shows up as throughput. See Production Increase.
04
How does an energy saving become an emissions reduction?
Fuel not burned is CO2 not emitted, so a 5 to 12% fuel reduction is a 5 to 12% reduction in combustion CO2 for that asset. Documented cases also show lower NOx and CO where combustion stabilized: 25% NOx and 45% CO reduction at the E.ON biomass plant, 5.2% NOx at the Midwest ethanol RTO. For ethanol producers, lower gas per gallon lowers the carbon intensity score directly.
05
Where does the lost energy go without a coating?
Low-emissivity surfaces reflect incident radiation back into the flue gas, which carries it up the stack. Flue gases absorb strongly in certain wavelength bands; energy re-emitted by an Emisshield surface is spectrally redistributed across broader wavelengths, so more of it passes through the gas to the load. How Emissivity Works
FAQ
Frequently Asked Questions
- What is the typical payback on a high emissivity coating?
- ROI is typically under a year, driven by fuel savings, production gains, and longer component life. Each case study states its own figure.
- Do the savings last?
- Documented service includes 36+ months on a glass furnace crown and more than 7 years on coated process tubes. Recoat intervals run 3 to 5 times longer than standard high emissivity coatings.
- Can I get savings on a boiler, kiln, or dryer, not just a furnace?
- Yes. The results table includes boilers, an HRSG, rotary dryers, an RTO, a glass crown, and kilns. The mechanism applies to any fired asset where radiation dominates.
- How is the saving measured?
- Against the plant's baseline: fuel flow, stack temperature, and product temperature before and after coating, with an uncoated control unit where one exists (Apache Nitrogen, India aluminium, Ghent pilot).
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