🔍 Key Concepts

• Sulphur in fuel oil and what it turns into during combustion • How combustion products affect metal surfaces in the boiler • Difference between atomization problems, slagging, and corrosion

💭 Think About

• When sulphur in fuel burns, what chemical compounds are formed in the furnace and the uptake gas path? • How do those compounds behave when they contact relatively cooler boiler surfaces, especially in the presence of moisture? • Which of the choices specifically describes damage linked to acidic or chemically aggressive flue gases rather than just dirt or poor spray quality?

✅ Before You Answer

• Identify which option refers to chemical attack on metal surfaces rather than a purely mechanical or thermal effect • Eliminate choices that mainly relate to burner performance (spray/atomization) instead of combustion by‑products • Consider which effect is a well‑known reason for using low‑sulphur fuel in marine boilers and engines