Class 1 (Chief Engineer) Engineering Management 📅 Jul 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:

(a) Tier 2 and 3 emission regulation on main engine (4)

(b) Primary NOx reduction vis-a-vis secondary NOx reduction measures. (4)

(d) Scavenge Air Moisturizing & Exhaust Gas Recirculation for ME. (4)

Reference Answer

### (a) Tier II and Tier III Emission Regulations on Main Engine
MARPOL Annex VI, Regulation 13 governs the emissions of Nitrogen Oxides (NOx) from marine diesel engines. The regulation establishes a series of tiered limits, which become progressively more stringent based on the ship's construction date.
**NOx Emission Limits (grams per kilowatt-hour - g/kWh):**
The limits are a function of the engine's rated speed (n, in rpm).

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