微粉炭燃焼の着火に関する研究

概要

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Author discovered a new experimental method to measure the flame propagation velocities of the mixture of pulverized coal and air. In this method, the coal-air mixture is fed into the open atmosphere as free-bounded flow, in which centre a small C_2H_2 gas flame is plecad as ignition flame, so that the steady flame-front of inverted cone shape may be formed in the mixture due to the balance of flame propagation velocity and flow velocity. Author proposed also a theoretical formula to induce flame velocity from flow velocity, cone angle and density drop at flame-front. With the above method the following themes are studied : (1) the relation of ignition burner flow rates to flame velocity, (2) the relation of mixture flow velocities to flame velocity, (3) the relation of pulverized coal concentration to flame velocity and. (4) the relation of grain sizes of pulverized coal to flame velocity. As a result of studv of (1) and (2), it has been found that, the ignition flame size and mixture flow velocity have little effect on flame velocity, and the above formula are proved right. On the other hand, coal concentration and grain sizes have much effects as follows : The mixture has maximum velocity at its proper concentration as gas mixture does, and flame velocity increases as grain size decreases.
社団法人日本機械学会の論文
1954-12-20