粉じんの濃度測定に関する研究 : 第1報, ろ紙濃度計による連続測定法

抄録

Studies were made on the measuring method of the dust concentration in the gas flow using a dust sampler of a flat paper filter type. The results of these investigation showed the dust concentration can be obtained only by measuring the rate of increase of the pressure drops per unit time on both side of the beds of filter paper, and needless to weigh the sampled dust in each case, but the value of specific resistance of the dust must be obtained beforehand by means of the preliminary experiment. So, the dust concentration C is expressed by the following formula. [numerical formula] where P^^*(m) : the rate of increase of the pressure drops per unit time through the filter paper (dP/dt mmAq/min). η : dust collection efficiency of the filter paper (almost 100 %). μ : coefficient of viscosity of the flowing gas (kg s/m²). u : mean velocity of the flowing gas through the filter paper (m/s). α : specific resistance of the dust (m/kg).