Converter bottom blowing system of bottom blowing gun shared by multiple media and use method of converter bottom blowing system

The invention relates to the technical field of converter steelmaking, in particular to a converter bottom blowing system of a multi-medium shared bottom blowing gun and a using method thereof.The converter bottom blowing system comprises a first gas source, the first gas source is communicated with a lime powder bin, a lime powder injection tank and a first injector in parallel, and a first stop valve is arranged between the lime powder injection tank and the first injector; the second gas source is communicated with the biomass carbon powder bin, the biomass carbon powder injection tank and the second injector in parallel, and a second stop valve is arranged between the biomass carbon powder injection tank and the second injector; a plurality of bottom blowing guns are arrayed at the bottom of the converter, the bottom blowing guns are communicated with a first ejector and a second ejector through a three-way pipe fitting, a third stop valve is arranged between the first ejector and the three-way pipe fitti