Control Efficiency of Submicron Particles by an Efficient Venturi Scrubber System
Publication: Journal of Environmental Engineering
Volume 133, Issue 4
Abstract
An efficient venturi scrubber system combining a particle growth device and a traditional venturi scrubber was designed and tested in the laboratory. Before the venturi scrubber, saturated steam at was mixed with normal temperature waste stream to achieve supersaturation conditions allowing submicron particles to grow into micron sizes. Hence the control efficiency of submicron particles was greatly enhanced at a reasonably low pressure drop as compared to that found in the literature. At a flow rate of and a liquid to gas ratio of , the control efficiency of the present venturi scrubber system for NaCl particles greater than is greater than 90%, and pressure drop is only about . In comparison, to remove only 50% of particles at the same liquid to gas ratio, the pressure drop needed will be greater than (or ). Theoretical calculation has also been conducted to simulate particle growth process and the control efficiency of the venturi scrubber considering the effects of mixing ratio (ratio of steam to waste stream by mass flow rate) and particle diameter. Theoretical results using Calvert’s theory (1970) were found to agree well with the experimental data for NaCl particles greater than , and for particles greater than .
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Acknowledgments
The writers are thankful to the funding provided by the National Science Council, Taiwan, under Grant No. NSC 89-2211-E-009-064.
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© 2007 ASCE.
History
Received: Nov 3, 2004
Accepted: Sep 19, 2006
Published online: Apr 1, 2007
Published in print: Apr 2007
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