WIT Press


COST EFFECTIVE MARINE EXHAUST ABATEMENT FOR NOX, SOX AND SOOT

Price

Free (open access)

Paper DOI

10.2495/MT190151

Volume

187

Pages

7

Page Range

167 - 173

Published

2019

Size

354 kb

Author(s)

ROBERT G. RICHARDSON

Abstract

This paper bridges controversy surrounding marine open loop exhaust gas scrubbing restrictions. The solutions offered in this paper apply equally well to both open and closed loop scrubbing methodology. The chlorine dioxide (ClO2) based gas/mist scrubbing technology presented in this paper works equally well in open and closed loop applications. This ClO2 based gas/mist phase exhaust scrubbing technology effectively removes more than 99% of SOX and most of the organic compounds including polycyclic aromatic hydrocarbon compounds (PAH) that create soot in marine exhaust. The very same ClO2 based gas/mist scrubbing equipment can also be configured to simultaneously treat SOX and NOX, plus most of the organic compounds that create soot. Where permitted, the sulfur based salts generated from the ClO2 based gas/mist SOX abatement process can be discharged directly into the sea without the typical additional washwater treatment required when SOX is treated with seawater scrubbers. Alternatively, when closed loop scrubbing is required, this ClO2 based gas/mist scrubbing process can store the sulfur based SOX reaction products as a very low volume paste until the ship is in a location that allows paste to be discharged into the sea. The scrubbing device is a simple cylinder that fits into the ship’s funnel and a small skid of equipment plus chemical storage that can be configured together or separately in the mechanical area of the ship. Overall, this equipment has a small physical size, high removal efficiency, and low equipment/operating cost. This ClO2 based gas/mist phase scrubbing technology can be combined with existing abatement equipment or used on its own. The ClO2 based gas/mist scrubbing technology is in full compliance with IMO regulations for SOX, NOX and soot.

Keywords

exhaust, scrubber, open-loop, closed-loop, chlorine dioxide, SOX, NOX, soot