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Optical Coal Particle Temperature Measurement under Oxy‐Fuel Conditions: Measurement Methodology and Initial Results
Author(s) -
Schiemann M.,
Scherer V.,
Wirtz S.
Publication year - 2009
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200900354
Subject(s) - pyrometer , combustion , char , coal , autoignition temperature , ignition system , volume (thermodynamics) , laminar flow , chemistry , diluent , adiabatic flame temperature , residence time (fluid dynamics) , analytical chemistry (journal) , volume fraction , nuclear engineering , materials science , thermodynamics , temperature measurement , nuclear chemistry , combustor , composite material , organic chemistry , engineering , physics , geotechnical engineering
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.