Evaluation of Selective Catalytic Reduction for Marine Two Stroke Diesel Engines
Author
Chladova, Lenka
Term
4. term
Education
Publication year
2010
Submitted on
2010-12-10
Pages
131
Abstract
Med øget fokus på at reducere udledninger fra fragtskibe stiger interessen for emissionsbegrænsende teknologi til maritime motorer. Denne afhandling undersøger, om selektiv katalytisk reduktion (SCR) kan reducere udledningen af kvælstofoxider (NOx) fra en storboret, langsomtgående skibsdieselmotor, som er typisk for et PANAMAX containerskib. SCR bruger en katalysator til at fremme en reaktionsproces mellem nitrogenoxid (NO) og ammoniak (NH3), ofte tilført via urea, for at sænke NOx i udstødningen. Teknologien er velkendt i landbaserede kraftværker, men er endnu kun begrænset anvendt på langsomtgående marine dieselmotorer. For at vurdere anvendeligheden udvikler afhandlingen et program til at dimensionere SCR-enheder til forskellige anvendelser og evaluerer det på MAN K90 MC-C og K98 MC-C fremdriftsmotorer. Resultaterne omfatter forventede katalysatormål, gennemstrømningshastigheder, ureaforbrug og profiler for NOx-reduktion for disse motorcases.
With growing pressure to cut emissions from cargo ships, interest in emissions-control technologies for marine engines is rising. This thesis examines whether selective catalytic reduction (SCR) can reduce nitrogen oxide (NOx) emissions from a large-bore, slow-speed marine diesel engine typical of a PANAMAX containership. SCR uses a catalyst to promote a reaction between nitric oxide (NO) and ammonia (NH3), often supplied via urea, to lower NOx in the exhaust. Although SCR is well established in land-based power generation, it has seen limited use on low-speed marine diesel engines. To assess feasibility, the thesis develops a program to size SCR units for different applications and evaluates it on MAN K90 MC-C and K98 MC-C propulsion engines. The results include expected catalyst dimensions, exhaust flow rates, urea consumption, and NOx reduction profiles for these engine cases.
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