Combustion Characteristics in High Temperature Air Combustion. I. High Efficient Heat Transfer.

High Performance Industrial Furnace Development Project has been proceeding by JIFMA entrusted from NEDO to clear 30% reduction of energy, 20% downsizing and very low NOx. We achieved completely the targets and verified the performance in as many as 150 examples of practical plants which are variety of reheating furnaces, heat treatment furnaces and melting furnaces in the field test project.Central to this combustion technology is high temperature air combustion technology using regenerative combustion system that preheats the air fed into the combustion furnace to over 1, 000°C, much higher compared with before and jets fuel into this high speed turbulent flow, then this means to preheat air over auto ignition temperature of fuel properties and to combust diluted by ample exhausted gas.This technology has many functions to eliminate local high temperature regions, to reduce temperature differences in the furnace, to attain high efficient heat transfer through an increase of the mean temperature inside the furnace without any local high temperature to optimize heating algorithm by some independent heat control mechanism and to control NOx by heating control. We describe combustion characteristics in high temperature air combustion compared with conventional combustion.