高濃度石炭・水スラリの微粒化に関する研究 : 第3報,噴霧液滴軌跡の相似則による燃焼性予測

概要

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In order to find the optimum atomizing condition for combustion efficiency, a combustion evaluation concept is introduced on the basis of the atomizing characteristics, and the dimensionless parameter Stk (Stokes Number) is used to analyze the trajectories of CWM spray droplets. Based on the these concepts, the Combustion Index CI is defined. The larger the CI values, the better the combustion. It is also found that the atomizing condition at a W_a/W_l of 0.26 is optimum for combustion efficiency. When W_a/W_l>0.26 blow-off occurs due to the increased injecting speed. On the other hand, the burn-out times become much longer because of worse atomization (in the condition of W_a/W_l<0.26). This is a very useful prediction method to evaluate the performance of an atomizer and the combustibility of CWM with various properties. The prediction results above are verified in a small-scale test furnace.
社団法人日本機械学会の論文
1987-10-25