Electrothermal rotary furnace capable of directly and efficiently utilizing heat energy

The invention discloses an electrothermal rotary furnace capable of directly and efficiently utilizing heat energy, comprising a machine base, a first spiral propelling shell, a second spiral propelling shell, a spiral propelling rod, a feeding hopper, a multi-section and sectioned rotary conducting ring, a carbon brush supporting frame, a shell, a regular polygon wear-resisting and corrosion-resisting corundum hearth, a hearth heat storage layer, a heat insulation layer, a vacuum heat preservation layer, an electric heating element, a large gear, a wheel belt, a riding wheel base, a motor, a speed reducer, a heat preservation layer, an air closing machine, an air inlet adjusting valve, a cold air preheating calandria, an inlet heat storage layer, an inlet heat preservation layer, and a heat preservation layer shell. The flow speed of flue gas in the furnace is low and adjustable, it can be guaranteed that low-grade steam is heated into superheated steam, the retention time of the flue gas in the furnace can