空気散布式給炭機に関する研究 : 第5報, 気流中における炭素球の燃焼に関する実験

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  • Research on the Pneumatic Spreader Stoker : 5th Report, The Experimental Investigation on the Combustion of a Carbon Globule in a Gas Stream
  • クウキ サンプシキキュウタンキ ニ カンスル ケンキュウ 5

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By measuring the weight of a carbon globule hanged in a hot gas stream with a precise balance, the combustion rate of a carbon globule was determined and the temperature of the carbon globule was measured with an optical pyrometer. The conditions selected for the experiments were as follows : Concentration of oxygen in the gas stream co2=5.7, 15.6 and 21.0%. Initial diameter of the carbon globule 2ri=6.2, 8.9, 12.3 and 16.0mm. Velocity of the gas stream ug=5, 10, 15 and 20m/s. Temperature of the gas stream tg=800 and 900°C. By comparing the results of these investigations with those of the published theoretical analysis, it has been concluded that 1) the experimental results qualitatively agree with the theoretical ones in the every respect, 2) the combustion rate of a carbon globule changes proportionally to ug0.45 and (ri/r)0.46 in a gas stream containing 21.0% oxygen, 3) the combustion rate of a carbon globule changes nearly in proportion to co2/1.2, 4) with the decrement of oxygen contained in a gas stream, the effects of the velocity of gas stream and radius of a carbon globule on the combustion rate of the carbon globule decrease.

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