Class 2 (2nd Engineer) MEKG 📅 Feb 2025

Exam Question

Exhaust gas cleaning system is one of the systems 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 continued use of high-sulphur fuel oil (HSFO) while complying with MARPOL Annex VI regulations. The systems are categorized based on their operational principle:
1. **Open-Loop System:**
* **Principle:** This system uses readily available seawater as the scrubbing medium. Seawater is naturally alkaline due to the presence of bicarbonate ions (HCO3-), which neutralize the acidic SOx from the exhaust gas.

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