Two-phase flow measurements and combustion tests of burner with continuously variable concentration of coal dust

Problems commonly occur when the coal type and/or the load are changed in u tility boilers. To solve these problems, a new pulverized coal burner, name ly, a burner with continuously variable concentrations of coal dust by usin g a set of blades, is developed in this study. Gas-solid two-phase flow dow nstream of the burner was measured by three-dimensional particle dynamics a nemometer (3D PDA). The results show that the particle concentration biased degree of the burner can be continuously adjusted between 1 and 3 by chang ing the angle between the blades and the primary air flow, over a range of 0-20 degrees. The turbulence characteristics in this range promote ignition and combustion of the pulverized coal. The results of combustion tests in a single burner furnace adopting the new burner verify that the temperature in both the near burner region and the furnace can be raised, which leads to better ignition and combustion characteristics of the pulverized coal th an with an ordinary burner.