Development of Super Low-Level NOx RT Burner for Annealing Furnace

by Takahito Suzuki, Kuniaki Okada

Publisher - JFE Steel Corp., Japan

Category - Engineering & IT

In the CGL of Fukuyama steelworks, we decided to adapt an only RT (radiant tube) furnace in the annealing furnace. Since RT burner alone does not have capacity whose NOx average value per hour is less than 90ppm (at 11%O2, COG), we decided to develop a super low-level NOx burner method. In order to lower the NOx emission of RT burner, we considered to use a pre-combustion system and exhaust gas recirculating system. As a result, we found out the optimum layout of RT burner and exhaust gas recirculating rate to develop a super low-level NOx RT burner. And this burner have a few heat spots on surface of RT. By using new RT burners in CGL of Fukuyama steelworks, we operate below 90ppm of NOx emission.

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