Blast furnace slag waste heat recovery and direct reduction joint production system and method

The invention discloses a blast furnace slag waste heat recovery and direct reduction joint production system and method. High-temperature slag enters a revolving cup pelletizer through a slag chute to be pelleted, and high-temperature slag particles with the diameter smaller than 5 mm are formed; when the slag particles are thrown out of a revolving cup to fly down, the slag particles come across pulverized coal sprayed by a pulverized coal spray gun arranged on a slag particle collector, and high-temperature slag particles wrapped with the pulverized coal are formed; the high-temperature slag particles wrapped with the pulverized coal fall into a primary cooling system, the pulverized coal comes across water vapor to be heated by the high-temperature slag particles and vaporized through the reaction, heat is absorbed in the reaction process, the high-temperature slag particles are quickly cooled to form glass slag, the temperature of the glass slag is controlled to range from 800 DEG C to 900 DEG C, and then the glass slag is discharged out of the primary cooling system; and gas generated through the reaction of the pulverized coal and the water vapor enters a reducing gas adjusting device through a gas dewatering device, finally enters a shaft furnace to reduce iron ore, is exhausted from a furnace top after reducing of furnace charge, and is cyclically used after CO2 separation and dewatering are conducted. Great environmental benefits and economic benefits are brought for iron and steel enterprises to achieve energy conservation and emission reduction.