Class 4 (4th Engineer) MEKG 📅 Oct 2022

Exam Question

With regards to keeping the gas side of boilers in good condition discuss EACH of the following:

(a) The mechanism of combustion, stating the factors which are important to good combustion (6)

(b) Oil fuel treatments (5)

Reference Answer

### (a) Mechanism of Combustion and Factors for Good Combustion
#### Mechanism of Combustion
Combustion in a boiler furnace is a controlled, rapid exothermic chemical reaction where the chemical energy stored in the fuel is converted into thermal energy. The process involves several sequential stages:
1. **Atomisation**: The fuel oil, under high pressure and at the correct viscosity, is forced through a burner's atomizer. This breaks the liquid fuel into a fine spray of millions of tiny droplets. This dramatically increases the surface area-to-volume ratio, facilitating rapid heating and vaporization.

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