Optical Coal Particle Temperature Measurement under Oxy‐Fuel Conditions: Measurement Methodology and Initial Results

Coal combustion under oxy‐fuel conditions shows significant differences to combustion in air. Examinations on the single‐grain level give detailed insight into the combustion phenomena of ignition, volatile combustion, and char burnout and, therefore, provide the fundamentals for the development of large‐scale oxy‐fuel facilities. The combustion of a hard coal in a size fraction of d p = 90–125 μm was investigated in a laminar flow reactor at a temperature of 1500 K. The gaseous fuel oxidizer contained 3 % O 2 by volume and CO 2 or N 2 as diluents. A third measurement in a CO 2 ‐rich atmosphere containing 9 % O 2 is also presented to show the influence of O 2 concentration. Particle temperatures were measured for three residence times with an imaging two‐color pyrometer.