Practical Combustion Methods Used in Industries - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 229

FIGURE 4.11 Types of air recuperator for the slab heating furnace in the hot rolling process.
been developed, such as multistage combustion, dispersion combustion, steam blow-
ing, premixed combustion, lean fuel combustion, and exhaust gas recirculation.
In HiTAC technology applied burner, the effectiveness of waste gas recycling
has been improved only by increasing the airflow velocity. The target for reducing
NO x has been realized by the multiplier effects of the dispersion combustion. In the
past, it was difficult to suppress the level of 100 ppm of NO x at preheated air
temperature in the range between 500 to 600˚C, when the furnace temperature was