Class 1 (Chief Engineer) Engineering Management 📅 Oct 2023

Exam Question

Exhaust emission control is a major global issue and under serious consideration by world shipping. In this context, comment on the following: (16)

(a) Tier 2 and 3 emission regulation on main engine

(b) Primary NOx reduction vis-a-vis secondary NOx reduction measures

(d) Scavenge Air Moisturizing & Exhaust Gas Recirculation for ME.

Reference Answer

The International Maritime Organization (IMO), through the MARPOL Convention Annex VI, establishes regulations to control air pollution from ships. A primary focus is on the reduction of Nitrogen Oxides (NOx), which contribute to acid rain, smog, and respiratory issues. The following sections detail the regulations and technologies employed to achieve compliance.
### (a) Tier II and Tier III Emission Regulations
MARPOL Annex VI, Regulation 13, defines a series of tiered emission limits for NOx from marine diesel engines over 130 kW. The applicable tier depends on the ship's construction date.
* **Applicability**: The regulations apply to any diesel engine with a power output of more than 130 kW installed on a ship, or an engine which has undergone a 'major conversion'.

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