Archive for the ‘Emission reduction’ Category
I have co-authored a paper entitled “TWO-STROKE ENGINE EMISSION REDUCTION
TECHNOLOGY: STATE-OF-THE-ART” in collaboration with my colleagues Michael Finch Pedersen and Stefan Mayer from the Process Development Department, Marine Low-Speed, MAN Diesel in Copenhagen. The paper has just been accepted for publication for the 2010 CIMAC congress held in Bergen, Norway, and will be presented by Michael Finch Pedersen at the congress on Tuesday 15th of June in the afternoon after 15.30 in Room B (according to the preliminary programme).
In the paper we present recent results on reducing the emission of pollutants from large two-stroke marine engines. We focus on primary methods, i.e. emission reductions obtained by in-cylinder methods in order to suppress emission formation. The methods presented are retrofit of fuel atomizers, water-in-fuel emulsion (WIF), exhaust gas recirculation (EGR) and a combination of WIF and EGR.
A new publication co-authored with my collegue Stefan Mayer at MAN Diesel A/S is out. The title is: “Use of Seawater Scrubbing for SO2 Removal from Marine Engine Exhaust Gas” and the paper is published in Energy & Fuels. As soon as possible a link to a full-paper download will be given.
The mechanism of SO2 absorption in seawater is treated. Emphasis is on applications of scrubbing of marine engine exhaust gas containing SO2. The formulated model is used to predict the influence of various parameters on SO2 absorption efficiency, e.g., seawater temperature, partial pressure of SO2, seawater salinity, and seawater alkalinity. It is found that the absorption capacity of standard seawater is approximately twice that of brackish water with close to zero salinity. The absorption capacity decreases with both decreasing salinity and alkalinity. Different scenarios in which the required water supply rate for a given SO2 cleaning efficiency is calculated. It is found that a 66% cleaning efficiency, corresponding to meeting the limits of SOx emission control areas (SECA) when operating on a fuel containing 4.5% w/w sulfur, requires a minimun water supply rate of 40–63 kg/(kW h) depending on the seawater composition in terms of salinity and alkalinity. Such data are essential in judging the operating cost of seawater scrubbing compared to alternative methods.