Size Distribution of Participates Emitted from a Horizontal Spike Soderberg Aluminum Reduction Cell

Discussion: “New Particle Size Measuring Probe—Application to Aerosol Collector and Emissions Evaluations” (Downs, W., and Strom, S. S., 1972, ASME J. Eng. Power, 94, pp. 117–123)

“…There are many areas this paper touches on which require extensive discussion and evaluation. Some of them are (a) what pertinent particle size and gas medium information is really necessary for designing adequate particulate control equipment; (6) how representative of the stack emissions will the particle size distribution be from a two-minute sample at one sampling location; (c) what sampling procedures must be used to ensure that a representative sample is obtained in a stack of a constantly varying process; (d) what causes probe deposition, thermal precipitation, gravity settling, turbulent deposition, and when does it actually become significant to particle sizing measurement; (e) does chemical analysis or does gravitational analysis lead to a more useful mass determination when sampling complex composition aerosols; and (/) what are the application limitations of this specific sampler configuration? The comments of this discussion are directed toward this last question.…”

“…Pilat, and Hrutfiord [5]; aluminum reduction plants as reported by Hanna and Pilat [6]; plywood veneer driers; anode baking plants; and fluidized bed sewage sludge incinerators. In general we agree with Downs and Strom that cascade impactors provide a practical and effective method for measuring the particle size distribution and the collection efficiency of control equipment as a function of particle size for the 0.2 to 10 micron diameter range.…”