Steam turbine combination unit and coal gasification system

The invention provides a steam turbine combination unit and a coal gasification system, and relates to the technical field of thermal power generation. The steam turbine combination unit comprises a steam turbine and a condenser, wherein the steam turbine comprises a cylinder, a rotor and blades, the rotor and the blades are all arranged inside the cylinder, and the rotor is connected with the blades; the cylinder comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder which are connected in sequence, flow channels of a first pressure stage, a second pressurestage and a third pressure stage of the high-pressure cylinder are all coated with anti-oxidation coatings, the flow channels of a last pressure stage, a penultimate pressure stage and an antepenultimate pressure stage of the low-pressure cylinder are all coated with anti-corrosion coatings, and the condenser communicates with the low-pressure cylinder; and the coal gasification system comprisesa coal gasification device