Black smoke issuing from the boiler stack...

Question 1 / 270705eccefa0bacbc34ba4d46e6e

Question 1 of 270705eccefa0bacbc34ba4d46e6e

Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by __________.

Question 1 of 27070

Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by __________.

🔍 Key Concepts

• Complete combustion vs. incomplete combustion in oil-fired boilers • Effect of fuel atomization quality (droplet size) on smoke formation • Relationship between fuel viscosity/temperature and burner performance

💭 Think About

• How does changing fuel temperature affect its viscosity and the quality of atomization at the burner nozzle? • Would very small or very large fuel droplets be more likely to burn cleanly and completely? • Which condition would most likely lead to unburned carbon particles going up the stack as black smoke?

✅ Before You Answer

• Compare how high vs. low fuel pressure influences atomization and droplet size • Consider whether thicker (more viscous) vs. thinner (less viscous) fuel is harder to atomize properly • Ask: which option would most reasonably lead to poor combustion and unburned fuel rather than a hotter, cleaner flame?

Question 1 of 27070

Black smoke issuing from the boiler stack can be caused by an improper fuel/air ratio and by __________.

excessively high fuel pressure

low fuel temperature

high fuel temperature

low fuel pressure

Loading interactive features...