Technological method and system for driving main exhaust fan by using vertical cold kiln to recover waste heat of sintered ore

The invention relates to a technological method and system for driving a main exhaust fan by using a vertical cold kiln to recover waste heat of sintered ore. The hot sintered ore is subjected to heat exchange with cold air in the vertical cold kiln, waste gas is conveyed to a waste heat boiler after being subjected to dedusting, and generated superheated steam is conveyed to a steam turbine; and the steam turbine directly drives the sintering main exhaust fan to operate through a variable-speed clutch and a synchronous motor. By the adoption of the vertical cold kiln of a novel structure, the recovery rate of the waste heat of the sintered ore can be increased to the maximum extent; complementation between electricity generation of the steam turbine and electric energy of a power grid is achieved through the synchronous motor, and normal operation of the sintering main exhaust fan is guaranteed; and the complete sintering plant energy utilization technological system is composed of the vertical cold kiln, th