Air and Gas Path

Question 1

What are the three controls of the FD fan?

Answer 1

1. adjusting the inlet damper supply air to the fan
2. adjusting the discharge damper from the fan
3. fan speed

Question 2

What is the temperature of the gases leaving the convection zone?

Answer 2

370DegC

Question 3

What is the temperature of flames in the fireball?

Answer 3

1650DegC

Question 4

In a natural draft boiler how is negative pressure created?

Answer 4

Hot air/gases rise by natural convection and consequently draw a vacuum

Question 5

What is the role of the FD fan?

Answer 5

supplies air under positive pressure for combustion

Question 6

What is the role of the ID fan?

Answer 6

draws combustion gases out of the furnace and maintains a slight negative pressure

Question 7

What is the disadvantage of a pressurized furance?

Answer 7

any leakage results in blow out of hot gases and dusts