Top powder injection efficient steelmaking method and system for large electric arc furnace

The invention discloses a top powder injection efficient steelmaking method and system for a large electric arc furnace, and belongs to the technical field of electric arc furnace steelmaking. According to a raw material charging system and a steel grade smelting process, the method calculates and distributes furnace top and furnace wall blowing oxygen amounts, carrier gas medium types, furnace top powder spraying types and powder spraying amounts, divides blowing stages, and blows powder into an electric arc furnace molten pool in a top blowing mode in the smelting process, so that the purposes of enhancing the molten pool stirring capacity, improving the reaction efficiency and reducing the production cost are achieved. And the molten steel quality is improved. The method and the system are simple, the furnace top and furnace wall injection oxygen amount, the carrier gas medium type, the furnace top injection powder type and the injection powder amount of the injection powder used by the large electric arc