Class 2 (2nd Engineer) MEKG 📅 Nov 2022

Exam Question

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

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

Reference Answer

### (a) Auxiliary Boiler Automatic Combustion Control System
#### Concept and Purpose
The primary objective of an automatic combustion control (ACC) system for an auxiliary boiler is to maintain the steam drum pressure at a constant setpoint by modulating the firing rate (combustion) in response to varying steam demand. It ensures safe, efficient, and autonomous operation by precisely controlling the Fuel Oil and Combustion Air supply.
#### Main Components:

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