The Ecotube system is a primary technique to reduce Nox emission, based on pressurised air injection through tubes extending inside the first pass of the furnace. This equipment has been tested on Energy from a Waste plant operated by Veohia Environment a six month trial period. Different configurations and settings have been tested, proving that it is possible to decrease the Nox concentration below 200 mg/Nm3, representing a 45 % reduction efficiency, while keeping the CO level below 10 mg/Nm3, without adding any reactant but air. Some tests have also been carried out injecting ammonia through the Ecotubes. In this case, Nox emission levels below 100 mg/Nm3 have been achieved.
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