The invention relates to a flow field optimization device capable of improving the capacity of a
coal mill. The flow field optimization device comprises an air inlet
pipe and three air guide pipes, wherein an air inlet of the air inlet
pipe stretches out of the
coal mill and is externally connected with an air source; the
coal mill is internally provided with three milling rollers which are uniformly distributed along the
peripheral direction of a milling disc at intervals; a coal falling
pipe of the coal mill is located above the middle part of the milling disc; the three air guide pipes areuniformly and vertically arranged above an edge of the milling disc at intervals along the
peripheral direction respectively, and are located at the outer sides of the two adjacent milling rollers respectively; the upper ends of the air guide pipes are connected and communicated with the air inlet pipe respectively; a blowing air pipe, which obliquely extends toward the center of the milling disc,is arranged at the lower end of each air guide pipe; a plurality of air outlet holes, which are used for blowing air toward the milling disc, are formed in the lower parts of the blowing air pipes along the length direction; a spraying
nozzle, which is used for blowing the air upward, is connected and communicated with the upper end of one end, far away from the corresponding air guide pipe, of each blowing air pipe. The flow field optimization device provided by the invention has the advantages that the structure design is simple and reasonable; ground coal
powder and raw coal can be effectively separated in time, and the capacity of the coal mill is improved.