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P-960 : NOx emission characteristics of radiant tube burners
조길원,이용국,박흥수,조한창 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
This study has been carried out to develop a low NOx radiant tube burner by applying various low NOx principles to burner design. The state-of-the-art technologies for low NOx combustion were analyzed to design experimental burner models. Full-scale combustion experiments have been performed for several kinds of burners using appropriate experimental apparatus. It has been confirmed that the air-staged combustion is effective for reducing NOx concentration. However, the sole application of staged combustion itself was not satisfactory to suppress the NOx emission to an ultimate low level. Lowering the primary air fraction could improve the temperature uniformity on the radiant tube and the low NOx performance. The well-known low NOx mechanisms for direct firing burners, e.g. the fuel direct injection method, showed little effect in reducing NOx emission in case of radiant tube burners. Temperature uniformity and NOx emission were improved by adopting biased fuel nozzle and delaying air/fuel mixing based on the staged combustion. With appropriate combination of low NOx methods, NOx emission of less than 150 ppm could be accomplished at the furnace temperature of 950℃ using coke oven gas as fuel.
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P-938 : Interchangeability of coke oven gas with mixtures of fuels
조길원,조한창 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The interchangeability coke oven gas (COG) to mixtures of blast furnace gas (BFG) and commercials such as BPG(BFG+LPG), CBL (COG+BFG+LNG) and BNG (BFG+LNG) were examined theoretically and experimentally. In theoretical analyses, Prigg-Gilbert``s and Weaver``s methods were used to evaluate fuel interchangeability. In combustion experiments, various burners were tested to measure flame stability and CO emission for different fuels. COG burners were found to be tenable for the fuel conversion to CBL in the whole range of BNG fraction. The conversion from COG to BNG or BPG showed poor interchangeability without burner modification. By adopting a multi-hole fuel nozzle to increase air/fuel mixing, flame stability and quality could be improved. In case of burners using oxygen as oxidant was little affected by fuel change compared with air burners. It was found that the flame stability was strongly influenced by fuel injection velocity and air/fuel mixing.
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Combustion control of a boiler based on the simultaneous measurement of oxygen and carbon monoxide
조길원,조한창 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
This study has been carried out to improve combustion control system of a boiler by applying oxygen control technology incorporated with CO measurement. A gas analysis station composed of a flue gas sampling system, an infrared analyzer and zirconia-based oxygen analyzers was installed at the flue of the boiler. On the basis of measured concentrations of oxygen and carbon monoxide, a feedback control of oxygen concentration was enabled to control air flowrate adequately. It was shown that the present control system works well with sufficient accuracy and reliability. A simulation for the target concentration of oxygen in the flue gas was performed to show that the optimal value of oxygen concentration is little affected by the changes in fuel flowrates and compositions. The optimal concentration of oxygen varied in the range of 1.3 to 1.5%, which suggested fixing the set point value for oxygen control. The measurement of CO concentration was effective for precise control of oxygen concentration to minimize heat loss of the flue gas to the environment.
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