Mechanical grate type waste gasifying incinerator and boiler power generation system thereof

The invention discloses a mechanical grate type waste gasifying incinerator which is smaller in heat conversion efficiency loss and is higher heat recovery efficiency, and a boiler power generation system thereof. The mechanical grate type waste gasifying incinerator comprises a gasifying incinerator, a boiler system, an air supply system and a power generation system, wherein the gasifying incinerator comprises a gasifier and an incinerator, the gasifier and the incinerator can be sealed or communicated, and an upper end of the gasifier and the incinerator are respectively provided with a smoke outlet; the boiler system comprises a boiler body, the boiler body is provided with a cyclone combustion chamber, a furnace chamber a and a furnace chamber b which are communicated with one another, a water-cooled wall is arranged in the cyclone combustion chamber, superheaters are arranged in the furnace chamber a, an evaporator is arranged in the furnace chamber b, and a top end of the boiler body is provided with a steam drum; the power generation system comprises a steam turbine, a power generator and a steam input pipe, an output end of the steam turbine is sequentially connected with a condenser, a water pump, a low-pressure steam water heater, a deaerator, a booster pump and a high-pressure steam water heater, and first-stage and second-stage water-steam separators and first-stage and second-stage high-pressure steam-steam heaters are arranged between air cylinders of the steam turbine.