Rotary gas-solid heat exchange device utilizing waste slag heat and heat exchange method

Abstract

The invention provides a rotary gas-solid heat exchange device utilizing waste slag heat and a heat exchange method. The rotary gas-solid heat exchange device comprises a heat exchange cylinder, a rotation control motor, a cooling fan and a vortex generator, wherein the front end and the rear end of the heat exchange cylinder are sealed, the heat exchange cylinder is provided with a charge hole, an air outlet, a discharge hole, an air inlet and a spiral channel, and the air intake direction of the cooling fan is opposite to the charging direction. The rotary gas-solid heat exchange device is also provided with a temperature controller, a pressure controller and a rotating speed transducer. Cooling air is input along the spiral channel, and is directly contacted with particles in an opposite moving mode to exchange heat with the particles. With the adoption of the rotary gas-solid heat exchange device, the air intake volume of the cooling fan, the air exhaust volume of a hot air outlet of a rotary heat exchanger and the slag charging and discharging volumes are well controlled, the contact area of heat exchange media is enlarged to the maximum extent, and the energy cost is saved to the maximum extent. The rotary gas-solid heat exchange device solves the problems of large water consumption, easiness in generation of harmful gases capable of polluting the environment, resource waste, high cost and poor effects in the heat exchange of the existing blast furnace slag.

Description

technical field [0001] The invention belongs to the technical field of blast furnace slag heat exchange, and in particular relates to a rotary gas-solid heat exchange device and a heat exchange method utilizing waste heat of slag. Background technique [0002] During the ironmaking process, coke is burned inside the blast furnace, which melts the iron ore and undergoes a reduction reaction to produce molten iron and blast furnace slag at a temperature of about 1450 °C. After the blast furnace slag and molten iron are separated, the molten iron enters the next production process such as steelmaking. The blast furnace slag is the main by-product and needs to flow out of the blast furnace, which contains a considerable amount of energy. At present, about 300kg of slag is produced for every ton of pig iron smelted from the blast furnace, and the discharge temperature is about 1450°C. 1 ton of blast furnace slag contains about 1700MJ of heat, which is equivalent to the calorific...

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Problems solved by technology

Its disadvantage is that it consumes a large amount of wate...

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