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Show Low NOx Combustion Technique for High Temperature Preheated Air M. Matsumoto, T. Koizumi, (* T. Nagata) Industrial Customers Development and Service Dept. Tokyo Gas Co. Ltd * International Affairs Dept. Los Angeles Office Tokyo Gas Co., Ltd Abstract Tokyo Gas has developed the FDI (Fuel Direct Injection) combustion technique for high temperature furnaces which is quite effective for NOx reduction. When the FDI combustion was combined with the regenerative system, one it demonstrated the effectiveness for NOx reduction by the FDI combustion and, two, energy savings by the regenerative system on the experimental fumace[1]. We have applied the system to actual high temperature furnaces such as forging furnaces, aluminum melting furnaces, reheating furnaces and so on. With these applications, NOx emission levels were reduced to less than 150 ppm (02 = 0%). Further development on the FDI has been conducting. In this paper, two types of new generation FDI systems, such as the FFR and the Super FDI, are described. The FFR (Full-time FDI Regenerative Burner), which has different configuration for air/gas nozzles, has been successfully developed to enable for continuous FDI operation from a low temperature range and simpler installation. Low NOx characteristics have been confumed for this system. The Super FDI is a new concept in which variable positioning of gas and air nomes is available throughout the furnace. The objective of Super FDI is to control the flame freely in the furnace as well as to reduce NOx. We have confirmed the low NOx characteristic of Super FDI by the experimental furnace. Finally, we are building a integrated calculation environment for industrial furnace engineering based on the FDI combustion. We have performed a number of calculations based on many actual furnaces to obtain the best know-how, from the arrangement of burners to eValuation method of the furnace. |
