COMBUSTION CHARACTERISTICS OF A ROTARY RE GENERATIVE COMBUSTION SYSTEM (RRX)

We have developed a rotary regenerative combustion burner (RRX burner) as an energy saving type, which is combined with a regenerative air p reheater and can be operated continuously. In this burner, motive stea m or air is provided through a jet nozzle located coaxially outside of the fuel gas nozzle to keep the flame sharp. By changing the flow rat e of motive fluid, combustion characteristics of the burner can be eas ily changed. Test results indicate that, by increasing the flow rate o f the motive steam, the temperature profile along the flame becomes mo re uniform and NO, concentration therefore becomes lower. Another char acteristic of this burner is that the whole amount of high temperature combustion flue gas returns to the burner and is exhausted to the flu e through the burner after exchanging heat with incoming fresh air. We tried to reduce the amount of hot return gas to the burner by providi ng a new flue on opposite side of the burner wall so as to exhaust som e of combustion gas through it. As a result of the above, it is observ ed that by decreasing return gas, the concentration of NOx is lower an d the flame is longer. In addition, it is proven that fuel oil can als o be burned with this RRX burner without any serious problems.