fly ash

Definitions

A residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases; when generated industrially it is usually captured and can be recycled for use in construction materials.

uncountable

Equivalents

Examples

“Heat exchangers should be kept free of debris to minimize the possibility of fire. Fly⟳ ash deposited in heat exchangers may cause nonuniform temperatures. Therefore, the exchangers should be disconnected and cleaned out regularly.”

“Among new freight vehicles was a prototype 21-ton wagon with pressure discharge for the conveyance of fly⟳ ash from power stations, […]”

“Furnaces and boilers with horizontal heating surfaces require⟳ frequent cleaning, because fly⟳ ash (fine powdery ash) collects on these surfaces.”

“Besides our sending out of cement by rail, we also bring⟳ in pulverised fly-ash, typically once a week, which comes from Drax Power Station and is used in the cement manufacturing process⟳, […]”

CEFR level