Draught classification: steam jet below the grate in the ashpit A steam jet issues from a nozzle placed in the ashpit under the fire grate to move air through the fuel bed. Identify the type of steam-jet draught. Choose the correct term.
Mechanical Engineering
Steam Boilers and Engines
Difficulty: Easy
Choose an option
-
AInduced steam jet draught
-
BChimney draught
-
CForced steam jet draught
-
DNone of these
Answer
Correct Answer: Forced steam jet draught
Explanation
Concept
- Forced steam-jet draught: Steam jets are applied below the grate (ashpit) to force air through the fuel bed into the furnace.
- Induced steam-jet draught: Steam jets are applied in the uptake or chimney to induce flow by entrainment of flue gases.
Identification
Placement under the grate clearly indicates a forced steam-jet system.Final AnswerForced steam jet draught.