Method and structure used for improving efficiency of turbo generator unit using solar energy optothermal/industrial waste heat for generating electricity

The invention discloses a method and a structure used for improving the efficiency of a turbo generator unit using solar energy optothermal/industrial waste heat for generating electricity. According to the method, the traditional single-cylinder and single-shaft unit is changed into a double-cylinder, double-shaft and double-rotating speed unit, the rotating speed of a high-pressure cylinder is 4000rpm-7200rpm, and the rotating speed of a low-pressure cylinder is 3000rpm or 3600rpm; an intermediate reheat cycle is adopted, a reheat pressure is selected to be 13%-30% that of an initial pressure, the root diameter of blades of the high-pressure cylinder is reduced for 15%-55%, the effective height of the blades is increased for 50%-140%, the backheating levels are 3-10 levels, and the unit efficiency is greatly improved.