Biomass gas mixed combustion device and mixed combustion method thereof

The biomass gas mixed combustion device comprises a shell and an annular groove, the annular groove is formed in the side wall of the shell, a plurality of first round holes are evenly formed in the inner side wall of the shell, a plurality of connecting pipes are evenly distributed and fixedly connected to the outer side wall of the shell, and the first round holes are communicated with the first round holes. And the first round hole and the connecting pipe are communicated with the inner cavity of the annular groove. By arranging the driving mechanism and the movable pipe, during use, a motor drives a first gear to rotate, the first gear is meshed with an annular gear to rotate, the annular gear is meshed with a second gear to rotate, the second gear drives the movable pipe to rotate, and at the moment, biomass gas and oxygen can be more sufficiently mixed together in the inner cavity of the shell; the combustion efficiency of the biomass gas is further improved, and the waste of biomass gas resources is re