Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Johns-Manville, CHEAF evaluation /
Author Calvert, Seymour, ; Rowan, Joel ; Lake., Charles
Other Authors
Author Title of a Work
Rowan, Joel,
Lake, Charles,
CORP Author Air Pollution Technology, Inc., San Diego, Calif.;Environmental Protection Agency, Washington, D.C. Office of Research and Development.
Publisher U.S. Environmental Protection Agency, Office of Research and Development ; For sale by the National Technical Information Service,
Year Published 1975
Report Number EPA/650-2-75-058a; EPA-68-02-1496; EPA-ROAP-21ADL-004
Stock Number PB-256 311
OCLC Number 02545201
ISBN pbk.
Subjects Air--Pollution--United States. ; Dust. ; Drying. ; Scrubber (Chemical technology)
Additional Subjects Air pollution control equipment ; Particles ; Air filters ; Design criteria ; Fines ; Efficiency ; Performance evaluation ; Particle size ; Impactors ; Cost estimates ; Concentration(Composition) ; Tables(Data) ; Graphic methods ; Scrubbers ; Cleanable high efficiency air filter ; Wet methods ; Dry methods
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 650-2-75-058a Headquarters Library/Washington,DC 09/26/2013
EJBD  EPA 650-2-75-058a Headquarters Library/Washington,DC 10/02/2014
NTIS  PB-256 311 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation vii, 53 pages : illustrations ; 28 cm.
The report gives results of an evaluation of the Johns-Manville CHEAF system for controlling particulate emissions. Fine particulate collection efficiency as a function of dry particle size was computed from data taken on the CHEAF system, a system used to control emissions from a diatomaceous earth calcining and drying process with an overall collection efficiency of 95%. The unit was operating at a capacity of 710 A cu m/min (25,000 acfm), at 63C (145F), with a pressure drop of approximately 50-53 cm (19.5-21 inches) water column. Initial tests showed inlet and outlet size distributions to be identical with a mass mean diameter of 0.82 micrometers A and a geometric standard deviation of 3.9. The data analysis indicates that particle penetration is relatively independent of particle diameter. Further tests revealed that particle growth occurs prior to the CHEAF system. Simultaneous heated and unheated impactor runs provided dried particle size distribution and actual (or wet) size distribution existing inside the scrubber, respectively. Particle growth was then determined, showing that particles grew as much as three times their original size in the submicron range, and less for larger sizes. This particle growth to a more uniform size can explain why penetration is relatively independent of inlet dry particle size.
Prepared by Air Pollution Technology, Inc., San Diego, California, under contract no. 68-02-1496, ROAP no. 21ADL-004, program element no. 1AB-12. Includes appendices. "EPA/650-2-75-058a." "July 1975."