HEAT RECOVERY TECHNOLOGIES
An ESA patent at the heart of “REKO” burners
The self recuperative burners integrate an heat exchanger that exploits the enthalpy of the flue gases to preheat the combustion air, thus obtaining savings of over 30% in fuel and emissions compared to cold air burners. Also compared to “recuperative” burners, which use the hot air of a centralized exchanger, self-recuperative burners are more efficient and flexible, and, as they constitute pre-assembled and standardized “packages”, also much cheaper.
At the heart of the third “release” of its self-recuperative burners “Reko” in 20 years, ESA boasts a patented technology that makes these burners a benchmark in terms of energy efficiency and emissions, even using pure hydrogen. Technology which, thanks to the modular design, is used in all available Reko typologies: with tense or flat free flames; for radiant tubes; with metal or SIC heat exchangers, and also for the PIR, the Plug In recuperator for W and U Shaped radiant tubes.
Circulation of air and hot gases
The heart of the patent consists of a valve that allows the air flow to be easily divided between ejection and combustion, as well as the use of a venturi, which develops a suction effect to facilitate the extraction of the fumes themselves.
Focus on Efficiency
In addition to the fundamental role of the heat exchanger, the Venturi and the steel housing for the regulation valve increase the exchange surface between the hot and cold fluids while the burner design exploits the principle of opposing flows of hot and cold air.
Insulated cast iron body
Thermal photograph of the burner body showing the low surface temperatures thanks to the internal insulation of the cast iron casting, an element that ensures safety for operators.
Free flame REKO
They are high-speed open flame burners for heat treatments and high-medium temperatures, they use a SIC flame tube. Staged combustion and flameless technology guarantees low NOx levels even when burning pure hydrogen and mixtures.
REKO for radiant tubes
They are Low NOx single-ended, P-shaped, double-P radiant tube burners for high temperature heat treatments. Staged combustion and flameless technology also guarantee low NOx levels even when burning pure hydrogen and mixtures.
Flat flame REKO
They are burners with radiant flame for heat treatments and high temperatures. Staged combustion and flameless technology guarantee low NOx levels even when burning pure hydrogen and mixtures.
“PlR”: PLUG IN Recuperator
The PIR is not a burner, but an heat exchanger for radiant tubes with a U and W profile, available in iron or SIC. Gas recirculation ensures combustion with low NOx levels.
REKO Metallic free flame
They are high-speed burners with large metal exchangers designed for applications with medium-low temperatures, which therefore require large exchange surfaces and ensure limited NOx creation.
REKO Metallic for radiant tubes
They are burners designed for radiant tubes for low-medium temperature applications, an element that ensures limited NOx creation.
A WIDE AND VERSATILE RANGE
Solutions for all mid-high temp heat treatments!
The “REKO” and PIR in the many available versions and in the appropriate capacities are used in all heat treatments at medium-high temperatures: hot galvanization lines for coils, heating and forging ovens, in aluminum maturation ovens as in other applications. Contact us to take full advantage of our offer.
FAQ ABOUT SELF RECUPERATIVE BURNERS
The efficiency of a furnace depends on multiple factors, first of all the temperature of the preheated air and the type of application. In our experience on average we can say that compared to cold air burners, self recuperative burners allow savings of over 30% in fuel. Various strategies are currently being studied to achieve even greater levels of efficiency.
The NOx problem is directly related to the increase in efficiency. The use of diluted combustion techniques (flameless, staged combustion) allows REKOs to reach very low “relative” emissions thresholds. But regardless of this, thanks to fuel savings, in reality the kg of absolute NOx emitted to generate the same power are reduced even further, a fundamental aspect often ignored by regulations, Not to mention the reduction of CO2 and the saving of many other resources.
Yes, especially in flameless mode. Regarding emissions, the considerations set out above apply with the added advantage of further reductions/cancellations of CO2 emissions when the percentage of H2 increases.
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