Abstract
Global air pollution regulations are becoming stricter for large diesel engines powering automobiles and ships. In the automotive sector, Euro 4 regulations came into force in January 2013 in accordance with European Union (EU) emission standards for heavy-duty diesel engines and are based on steady-state testing. In the marine sector, the International Maritime Organization(IMO) Maritime Environment Protection Committee(MEPC) is a group of experts who discuss all problems related to the prevention and control of marine pollution from ships, such as efforts to reduce ozone-depleting substances and greenhouse gas emissions. To reduce the harmful emissions from marine diesel engines, a wet-type exhaust gas cleaning system was developed in this study. As a test, seawater, electrolyzed water, and sodium hydroxide were sequentially injected into the exhaust gas. SO2 was reduced by 98.7–99.6% with seawater injection, NOx by 43.2–48.9% with electrolyzed water injection, and CO2 by 28.0–33.3% with sodium hydroxide injection.
Highlights
Global air pollution regulations for large diesel engines powering automobiles and ships are becoming stricter [1]
To remove Nitric Oxide (NOx), Sulfur Oxide (SOx), and CO2 generated from engine combustion, real seawater that had not been electrolyzed, electrolyzed seawater, and a sodium hydroxide (NaOH) solution diluted to a certain concentration were sprayed sequentially onto exhaust gas discharged from a diesel engine
The results indicated that the total NOx removal rate was 43.2–48.9%, as shown in Figure 8, and the injection of the reducing agent in the No 3 tower showed a negative effect
Summary
Global air pollution regulations for large diesel engines powering automobiles and ships are becoming stricter [1]. Ryu et al [9,10,11] applied two types of fuel additives based on Ca and Fe to reduce the fuel consumption and emissions of marine diesel engines. Selective catalytic reduction (SCR) is being applied to large vehicles such as diesel engine trucks and in onshore power plants to reduce NOx [19] It has been installed in many ships. Ryu et al [20] reported the installation of SCR to reduce NOx emissions from ships to meet the IMO MEPC Tier 3 regulations. Seawater, electrolyzed seawater, and sodium hydroxide were sprayed sequentially onto exhaust gas from a diesel engine to reduce NOx, SOx, and CO2. This apparatus for reducing exhaust gas with seawater can be used on ships and in thermal power plants by the sea
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