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Numerical Study on NO Conversion Characteristics of Ceramic and Metallic Monoliths Under Steady-State External Heat Loss in Marine After-Treatment System
Abstract
This study aims to numerically analyze the ceramic and metallic monoliths as a catalyst substrate of selective catalytic reduction
(SCR) system in marine applications. The representative elementary volume of each catalyst substrate was chosen and
pressure drop through the volume was numerically calculated to estimate the parameters for the porous model. The fi xedbed
experiment using a powder catalyst of 3V7MO/TiO 2 was conducted in the way to estimate the global one-step reaction
kinetics. Thus, the NO conversion from both ceramic and metallic monolith catalysts was calculated by a porous model
with a simplifi ed reaction mechanism to numerically investigate the fl ow and thermal characteristics within the two types
of catalyst substrate. As an extreme condition, an external heat loss with an ambient temperature of 300 K was set to the
reactor wall. Predicted results indicate that the NO conversion performance of ceramic monolith is better in general due to
the lower heat loss from the cold wall. However, it is found that there is a trade-off relationship between the residence time
and the external heat loss. Heat management such as thermal insulation plays an essential role to maximize the benefi ts of
using metallic monolith as a catalyst substrate for practical marine applications.
