Effect of a Plasma Burner on NOx Reduction and Catalyst Regeneration in a Marine SCR System

Jaehwan Jang, Seongyool Ahn, Sangkyung Na, Jinhee Koo, Heehwan Roh and Gyungmin Choi
Additional contact information
Jaehwan Jang: School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Seongyool Ahn: Plant Engineering Center, Institute for Advanced Engineering, 175-28, Goanro 51, Yoingin-si 17180, Korea
Sangkyung Na: REVO Co., Ltd., 6, Changi-daero 113beon-gil, Uichang-gu, Changwon-si 51388, Korea
Jinhee Koo: STX Engine Co., Ltd., 36 Gongdanro 474 Beongil, Seongsangu, Changwon-si 51574, Korea
Heehwan Roh: STX Engine Co., Ltd., 36 Gongdanro 474 Beongil, Seongsangu, Changwon-si 51574, Korea
Gyungmin Choi: School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea

Energies, 2022, vol. 15, issue 12, 1-14

Abstract: The problem of environmental pollution by the combustion of fossil fuels in diesel engines, to which NOx emission is a dominant culprit, has accelerated global environmental pollution and global and local health problems such as lung disease, cancer, and acid rain. Among various De-NOx technologies, SCR (Selective Catalytic Reduction) systems are known to be the most effective technology for actively responding to environmental regulations set by the IMO (International Maritime Organization) in marine diesel applications. The ammonia mixes with the exhaust gas and reacts with the NOx molecules on the catalyst surface to form harmless N 2 and H 2 O. However, since the denitrification efficiency of NOx can be rapidly changed depending on the operating temperature from 250 °C to 350 °C at 0.1% sur contents of the catalyst used in the SCR, a device capable of controlling the exhaust gas temperature is essential for the normal operation of the catalyst. In addition, when the catalyst is exposed to SOx in a low exhaust gas temperature environment, the catalyst is unable to reduce the oxidation reaction of the catalyst, thereby remarkably lowering the De-NOx efficiency. However, if the exhaust gas temperature is set to a high temperature of 360–410 °C, the poisoned catalyst can be regenerated through a reduction process, so that a burner capable of producing a high temperature condition is essential. In this study, a plasma burner system was applied to control the exhaust gas temperature, improving the De-NOx efficiency from the engine and regenerating catalysts from PM (Particulate Matter), SOOT and ABS (ammonia bisulfate), i.e., catalyst poisoning. Through the burner system, the optimum De-NOx performance was experimentally investigated by controlling the temperature to the operating region of the catalyst, and it was shown that the regeneration efficiency in each high temperature (360/410 °C) environment was about 95% or more as compared with the initial performance. From the results of this study, it can be concluded that this technology can positively contribute to the enhancement of catalyst durability and De-NOx performance.

Keywords: selective catalytic reduction; catalyst; De-NOx; plasma burner; regeneration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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