Abstract
The results of fractional and overall mass efficiency tests of a steam-ejector scrubber are presented. The tests were performed on one of seven modules of a full scale scrubber used for controlling particulate emissions from an open hearth furnace. Total flue gas particulate mass concentrations were determined at the inlet and outlet of the scrubber by conventional (Method 5) techniques. Inlet and outlet particulate concentrations as functions of diameter were determined on a mass basis using cascade impactors for sizes from about 0.3 μm to 5 μm, and on a number basis for diameters smaller than about 1 μm using optical and diffusional methods. Measurements were made under several scrubber operating conditions. The measured efficiencies based on total particulate mass concentrations with the scrubber operating under near optimum conditions ranged from 99.84 to 99.9%. The measured fractional efficiencies ranged from a maximum of 99.99% for particles having diameters of 1 μm to values of 97 and 99.9% for particles having diameters of 0.1, and 5 μm, respectively.
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