Class 2 (2nd Engineer) MEKG 📅 Sep 2024

Exam Question

(a) Sketch diagrammatically an auxiliary boiler automatic combustion control system and explain how it operates. (8)

(b) Specify how 'fail-safe' conditions are ensured. (4)

Reference Answer

### Part (a): Auxiliary Boiler Automatic Combustion Control System and Operation
**(i) System Description**
An auxiliary boiler automatic combustion control system is designed to safely and efficiently manage the firing of the boiler to meet a fluctuating steam demand without manual intervention. The system ensures correct start-up sequences, maintains steam pressure within a set range, and optimizes the air-to-fuel ratio for complete combustion. The primary components, linked either mechanically or electrically, include:
* **Master Steam Pressure Controller:** The brain of the system, sensing steam drum pressure.

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