Class 2 (2nd Engineer) MEP 📅 Aug 2025

Exam Question

With regard 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;

(b) Oil fuel treatments;

Reference Answer

(a) In boiler furnace, chemical energy in the fuel is converted into heat by the process of combustion. The forced draft fan supplies the primary and secondary air required for atomisation and combustion. The primary flame heats the heavier constituents of the fuel to their ignition temperature. The larger oil droplets are heated in their passage through the primary flame zone, vaporised and burnt.
For good combustion:
Oil should arrives with the correct viscosity and pressure for the atomizing system in use for proper atomisation.
The pipe system conducting the fuel is arranged so that prior to lighting up, adequately heated oil can be re-circulated providing a supply at suitable conditions as soon as light-up is attempted.

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