Class 2 (2nd Engineer) MEKG 📅 Oct 2023

Exam Question

Exhaust gas cleaning system is one of the system used on board ship to reduce SOx emissions:

(a) Briefly discuss various types of Exhaust gas cleaning system used on board ship. (5)

(b) What all data to be monitored and recorded when EGCS is in use to ensure that system meets all IMO regulations. (5)

Reference Answer

### (a) Types of Exhaust Gas Cleaning Systems (EGCS)
Exhaust Gas Cleaning Systems, commonly known as scrubbers, are installed on board ships to remove Sulphur Oxides (SOx) from engine exhaust gas, enabling the use of high-sulphur fuel oil while complying with MARPOL Annex VI regulations. The systems are primarily classified based on their operational method and the scrubbing medium used.
1. **Open-Loop System:**
* **Principle:** Utilizes the natural alkalinity of seawater to neutralize SOx. Seawater contains bicarbonate ions (HCO₃⁻) which act as a buffer.

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