The ship exhaust gas treatment system (mainly including denitration and desulfurization subsystems) is the key environmental protection equipment of the ship that is required to be installed by the International Maritime Organization (IMO) MARPOL convention. It conducts desulfurization and denitration harmless treatment for the exhaust gas of the ship diesel engine to prevent the air pollution caused by the uncontrolled emission of the ship exhaust gas.
In view of the increasing awareness of environmental protection and the increasing recognition of shipowners, the market demand for ship exhaust gas treatment systems is huge. Next, we will discuss with you from the specification requirements and system principles:
1. Relevant specification requirements
In 2016, Tier III came into effect. According to this standard, all ships built after January 1, 2016, with a main engine output power of 130 kW and above, sailing in North America and the US Caribbean Emission Control Area (ECA) , the NOx emission value shall not exceed 3.4 g/kWh. IMO Tier I and Tier II standards are applicable globally, Tier III is limited to emission control areas, and the sea areas outside this area are implemented in accordance with Tier II standards.
According to the 2017 IMO meeting, from January 1, 2020, the global 0.5% sulfur limit will be officially implemented.
2. Principle of desulfurization system
In order to meet the increasingly stringent ship sulfur emission standards, ship operators generally use low-sulfur fuel oil, exhaust gas treatment systems or clean energy (LNG dual-fuel engines, etc.) and other solutions. The selection of the specific plan is generally considered by the shipowner in combination with the economic analysis of the actual ship.
The desulfurization system adopts composite wet technology, and various EGC systems (Exhaust Gas Cleaning System) are used in different water areas: open type, closed type, mixed type, seawater method, magnesium method, and sodium method to meet the operating cost and emissions. the optimal combination required.
Post time: Aug-16-2022