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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.