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http://dx.doi.org/10.7837/kosomes.2020.26.6.751

Analysis of Ammonium Carbamate Used as a NOx Reducing Agent for the SCR System of Marine Diesel Engines  

Kim, Hongsuk (Engine Research Center, Korea Institute of Machinery & Materials)
Ryu, Younghyun (Division of Marine Mechatronics, Mokpo National Maritime University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.6, 2020 , pp. 751-758 More about this Journal
Abstract
SCR technology, which uses urea-water as a NOx reducing agent, has been widely used to reduce NOx in marine diesel engines. However, as an alternative NOx reducing agent, solid-phase ammonium carbamate has several advantages, such as low-temperature NOx reduction performance and NH3 storage capacity. This study presents a method for evaluating the purity of ammonium carbamate using EA, FTIR, and XRD to investigate the change in the material characteristics of ammonium carbamate when it is exposed to various temperature and pressure conditions. In this study, it was found that the purity of ammonium carbamate can be effectively evaluated via EA analysis. The FTIR analysis results confirmed that the properties of ammonium carbamate did not change even after repeated heating and cooling under thermal decomposition temperature conditions, which may be applied to the SCR system of marine diesel engines. Additionally, it was found that when ammonium carbamate was exposed to the atmosphere for a long time, it transformed into ammonium carbonate.
Keywords
Marine diesel engine; Nitrogen oxide; Solid ammonium SCR system; Ammonium carbamate; EA; FTIR; XRD;
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