Rotary type variable frequency pulverized coal deep separation and uniform distribution device and method for medium speed coal mill

Abstract

The invention discloses a rotary type variable frequency pulverized coal deep separation and uniform distribution device and method for a medium speed coal mill. The rotary type variable frequency pulverized coal deep separation and uniform distribution device is characterized in that a separating and mixing conical section sleeves the side surface of a coal dropping pipe in a noncontact manner; a residual rotation elimination and uniform distribution grid and a plurality of axial flow blades are arranged in the separating and mixing conical section in sequence from top to bottom; a finished pulverized coal airflow outlet of a separator communicates with the bottom opening of the separating and mixing conical section; the top opening of the separating and mixing conical section communicates with a pulverized coal pipe through a pulverized coal pipe inlet conical section; an annular coarse pulverized coal return passage partition is positioned in the separating and mixing conical section and positioned between the separating and mixing conical section and the axial flow blades; the annular coarse pulverized coal return passage partition and the inner wall of the separating and mixing conical section form an annular coarse pulverized coal return passage; the top opening of the annular coarse pulverized coal return passage is positioned above the axial flow blades; and the bottom opening of the annular coarse pulverized coal return passage is positioned below the axial flow blades. According to the rotary type variable frequency pulverized coal deep separation and uniform distribution device and method for the medium speed coal mill, the problem of a greater distribution deviation in the pulverized coal quantity of the pulverized coal pipe is fundamentally solved, the deep separation of pulverized coal is realized, and the quality of pulverized coal is higher.

Description

technical field [0001] The invention relates to a device and method for deep separation and distribution of pulverized coal, in particular to a device and method for deep separation and distribution of pulverized coal with variable frequency rotation of a medium-speed coal mill. Background technique [0002] Medium-speed pulverizers generally have a series of problems such as uneven distribution of powder volume in each outlet powder pipe, large deviations in pulverized coal concentration, pulverized coal fineness, and uniformity index of pulverized coal between each pulverized pipe, and some medium-speed coal pulverizers The powder amount and pulverized coal fineness deviation between the powder pipes of the system even reached more than 50%, and the pulverized coal uniformity index also failed to meet the design requirements. These series of problems directly and seriously threaten the safety and economy of boiler combustion. The traditional medium-speed pulverized coal p...

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Problems solved by technology

[0003] The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a medium-speed coal pulverizer with frequency conversion rotating pulverized coal depth separation and equalization device and method, The device and method can fundamentally solve the problem of large powder distribution deviation in the powder pipe, and at the same time realize the deep separation of pulverized coal, and the quality of pulverized coal is high

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