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Ship exhaust gas treatment system (mainly including two subsystems of denitrification and desulfurization) is the key environmental protection equipment for ships required by the International Maritime Organization (IMO) MARPOL Convention. Ship emissions contribute to air pollution.

With the increasing awareness of environmental protection and the gradual increase in ship owner approvals, the market demand for ship exhaust gas treatment systems is huge.

gas washing
1 According to this standard, for all ships built after January 1, 2016, with a main engine output power of 130 kW and above, the nitrogen oxide emission value shall not exceed 3.4 g/kWh when sailing in North America and the American Caribbean Emission Control Area (ECA). IMO Tier I and Tier II standards apply globally, Tier III is limited to emission control areas, and sea areas outside this area are implemented according to Tier II standards.
2 According to the 2017 IMO meeting, from January 1, 2020, the global sulfur limit of 0.5% will be officially implemented.

Principle of denitrification system
1 The denitrification system adopts the selective catalytic reduction (SCR) method, that is, under the action of a catalyst, the reducing agent reacts with nitrogen oxides within a certain temperature range (280~450°C) to generate harmless nitrogen and water. In order to ensure the safety of personnel wearing, the reducing agent does not use ammonia gas directly, but uses the process of spraying urea solution into high-temperature exhaust gas to decompose and generate ammonia gas, which avoids the danger of ammonia gas storage and use.
The denitrification system mainly includes a catalytic reactor, a urea reflection unit, a urea quantitative injection unit and a distributed control system.

Desulfurization system technology
1 In order to meet the increasingly stringent ship sulfur emission standards, ship operators usually adopt solutions such as low sulfur fuel oil, exhaust gas treatment system or clean energy. The selection of the specific plan is generally considered by the shipowner in combination with the economic analysis of the actual ship.
2 The desulfurization system adopts composite wet technology, and various EGC systems (exhaust gas cleaning systems) such as open type, closed type, mixed type, seawater type, magnesium method, sodium method, etc. are used in different waters to meet the requirements of the best combination of operating costs and emissions.

As a professional nozzle manufacturer, HAPOO provides high-quality nozzle products and technical support for ship exhaust gas treatment systems. Our solutions are designed to improve the environmental performance of ships, meet international standards and provide ship owners with efficient and reliable cleaning technologies. Choose HAPOO and join us in building a cleaner and better shipping future.

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