With reference to oil fired boilers: (a) Describe, with the aid of a sketch, the fuel system including the pilot ignition system (6) (b) Explain how the boiler whose fuel system is described in part (a) is flashed up from cold on diesel and changed over to heavy fuel operation (6) (c) Explain how the air and fuel supplies are controlled together in order to produce optimum combustion at all loads (4)
WHRS & Boiler

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