Characterization of a High Efficiency Pilot Plant Wet Scrubber with Internals for Fly Ash Removal

A. Biswasa, B. Rajmohana, C.R. Mohantyb, B.C. Meikapa, *
a Department of Chemical Engineering, Indian Institute of Technology Kharagpur &
b State Pollution Control Board, Orissa, India

© 2008 Biswas et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Chemical Engineering, Indian Institute of Technology Kharagpur, India; Fax: +91- 3222-282250; E-mail:


Removal of fly ash using wet scrubbers is widely used in the small and medium scale industries. Among the wet scrubbing methods, spray column falls into the simplest type category for its simple construction and various advantages. A novel pilot plant wet scrubber has been conceived, designed and fabricated. This paper distinctly focuses on the detailed design and fabrication of the ejector, which has been used to prepare fly ash-air mixture in the laboratory. A detail experimental investigation has been carried out to characterize the system. Studies indicate very encouraging result. The size analysis of the fly ash sample along with efficiency of fly ash removal in the wet scrubber has critically been examined. It has been found that the present system yielded mentionable high efficiency for the scrubbing of fly ash. In most of the cases, the efficiency lies between 70.% and 90.%. The maximum efficiency obtained is above 90 %.

Keywords: Fly ash, ejector, spray column, droplets, sparger, residence time, scrubbing efficiency.