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холодная воронка stresses
el.	hopper bottom; bottom ash hopper
tech.	ash hopper (топки); dry-bottom hopper (топки); sloping bottom (топки)
therm.eng.	sloping bottom (печи); combustion chamber hopper; dry bottom; dry bottom hopper; furnace bottom ash hopper; furnace hopper; hopper-shaped bottom; V-type ash hopper

холодная воронка: 11 phrases in 4 subjects

Energy industry	6
Makarov	1
Technology	2
Thermal engineering	2