Mitsubishi Heavy Industries, Ltd. (MHI) has developed an ultra‐low NOX burner (the M‐PM burner) for coal‐fired boilers, the demand for which is expected to remain firm. In addition to our prominent experience in this field, the burner was developed based on the concepts of low‐NOX combustion conceived from the results of computational fluid dynamics (CFD) analysis, a field in which the recent improvement of calculation capacity has been remarkable. The scale‐up test was conducted using a combustion test furnace with a single burner. Compared with latest low Nox burners before the development of the M‐PM burner (A‐PM burners), Nox emissions were cut by 40% under the condition in which the unburned carbon content was the same. The M‐PM burner was then installed in an actual unit, simultaneously achieving a 42% decrease in NOX emissions (NOX level: approximately 50 ppm and the unburned carbon in the fly ash is 1% for coal with a fuel ratio of 1.7) and a 50% decrease in unburned carbon content. The use of our new burner can be effective not only for lower Nox emissions, but also for the improvement of efficiency and the prevention of sulfidation corrosion.
