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.

Difficulty: Easy

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 Answer
Forced steam jet draught.

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