FIELD: thermal power engineering equipment, particularly automatic boiler unit regulating systems. SUBSTANCE: device has up-directed and down-directed pipeline parts communicating with each other in upper ends thereof, fluidizing block located at up-directed pipeline part end and connected by flow regulator with air pressure source. Meter of coal duct volume density is installed in up-directed pipeline part upper area. Vertical pipe with meter of coal duct level having outlet connected to amplifier first input is installed in up-directed pipeline part upper area. Meter second input is linked to output of meter of coal duct concentration. Amplifier is made as multiplier hawing inputs connected to memory element for calculating of square root. EFFECT: increased effectiveness. 2 cl, 2 dwg
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