レーザで着火した微粉炭粒子群の燃焼特性

概要

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Combustion behaviors of pulverized coal clouds suspended in a laminar upward flow were examined by heating them with a single pulsed YAG laser. Observation with a high-speed video camera revealed that only a few particles heated by the pulsed laser preceded the increase of the burning particles and the pulverized coal flame propagation. The lower limit of flame propagation of pulverized coals was determined from the relationship between suspended cloud concentration and flame propagation probability. Flame propagation velocity was also analyzed by processing of flame images. Near-the lower limit of flame propagation, propagation velocity increased with concentration and revealed its maximum depending on coal varieties and oxygen concentration in the flow. Coal containing less volatile matter showed lower maximum propagation velocity.
1996-09-25