One of the problems to apply and install efficient regenerative combustion systems to radiant tubes is to reduce NOx emission by high temperature combustion. Beyond ineffective former double-stage combustion and waste gas recirculation system wesucceeded in NOx reduction by combustion gas self-recirculation system. We realized its ability and proved advantage over former systems by installation in the continuous annealing furnace. Besides energy conservation, we can expect it to extend lifetimeof tubes by temperature uniformity.
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