A high capacity preseparator for collecting large particles
Abstract
Classical inertial impactors are typically limited to mass deposits on the order of a few milligrams per stage due to particle re-entrainment problems. For stack sampling applications, particularly those related to sampling upstream of control equipment, this limitation may necessitate very short sampling periods. A device which is designed to reduce this problem, a high capacity preseparator, has been tested with both monodisperse aerosols and with dry dusts. At a flow rate of 14.21/min (0.5 cfm) the cutpoint aerodynamic size is 10.8 microns and the corresponding cutpoint Stokes number is 0.115. Tests with Detroit Edison fly ash show similar results - a cutpoint aerodynamic size of 11.2 microns. Of fly ash particles sampled by the device, 92.5% of the aerosol associated with sizes larger than 15 microns is collected by the preseparator. The loading characteristics of the device were tested over a range of 100 mg-1 g of collected dust. No indications of increased large particle carry-over were noted.
- Publication:
-
Atmospheric Environment
- Pub Date:
- 1979
- DOI:
- 10.1016/0004-6981(79)90266-X
- Bibcode:
- 1979AtmEn..13..761M
- Keywords:
-
- Aerosols;
- Air Sampling;
- Dust Collectors;
- Impactors;
- Particle Size Distribution;
- Accumulators;
- Air Filters;
- Air Pollution;
- Ashes;
- Drop Size;
- Graphs (Charts);
- Particle Mass;
- Performance Tests