Blast furnace slag granulation and waste heat recovery and utilization device and method

An apparatus for granulation of a blast furnace slag and recycling of waste heat, wherein the apparatus comprises an aerosol granulation nozzle module, a flow guide (7), a cyclone separator (8) and a waste heat recovery device;

• wherein the aerosol granulation nozzle module comprises a slag flow controller (2), a compressed air flow control valve (3), a water volume control valve (4) and an aerosol spray gun (5);
• wherein the slag flow controller (2) is coupled to a slag inlet of the flow guide (7);
• the compressed air flow control valve (3) is coupled to a gas inlet of the aerosol spray gun (5);
• the water volume control valve (4) is coupled to a liquid inlet of the aerosol spray gun (5);
• wherein a nozzle of the aerosol spray gun (5) is configured to face an inlet of the flow guide (7) to enable an aerosol to impinge a slag stream entering the flow guide (7) through the slag flow controller (2) to form a medium-temperature gas and a high-temperature granular slag (6) having a primarily solidified surface;
• wherein the flow guide (7) is configured to fully mix the medium-temperature gas and the high-temperature granular slag (6) having a primarily solidified surface in the flow guide, wherein an outlet of the flow guide (7) is coupled to a feed port of the cyclone separator (8) to allow for entry of a completely solidified high-temperature granular slag (6) and a medium-to-high-temperature gas formed in the flow guide (7) into the cyclone separator (8);
• wherein the cyclone separator (8) is configured to separate the high-temperature granular slag (6) and the medium-to-high-temperature gas;
• wherein a discharge port of the cyclone separator (8) is coupled to a feed port of the waste heat recovery device for delivery of the medium-to-high-temperature gas and the completely solidified high-temperature granular slag (6) to the waste heat recovery device.