Vertical roller mill

Patent metadata

Field	Value
Publication number	US-2016199844-A1
Application number	US-201414909789-A
Country	US
Kind code	A1
Filing date	Aug 19, 2014
Priority date	Nov 1, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A vertical roller mill provided with a cyclone-type fixed separator that separates fine powder and allows the separated powder to flow out to the outside, the cyclone-type fixed separator being provided inside a housing, wherein the fixed separator is configured so that a solid-gas two-phase flow is introduced from a fixed blade inlet window opening on a cone into the inside and the solid-gas two-phase flow is swirled using a fixed blade attached in the inside vicinity of the fixed blade inlet window, whereby the fine powder flows out to the outside from a pulverized coal outlet in an upper portion of the vertical roller mill through the lower end side of an inner cylinder provided inside the cone, a surface layer in which the rebound coefficient of collided particles is higher than in an iron plate surface being formed in the outer surface of the inner cylinder.

First claim

1 . A vertical roller mill comprising, in a housing, a fixed cyclone separator configured to separate, when a solid-gas two-phase flow for delivering powder obtained by pulverization of a solid passes through the fixed cyclone separator, fine powder having a small particle size by centrifugal force to flow out to an outside,
wherein the fixed cyclone separator is configured such that after the solid-gas two-phase flow is introduced into the fixed cyclone separator through a fixed blade inlet window opening at a cone-shaped member, the fine powder is flowed out from an upper outlet to the outside by way of a lower end portion of an inner cylinder provided inside the cone-shaped member by swirling the solid-gas two-phase flow by a fixed blade attached to a vicinity of the fixed blade inlet window inside the fixed blade inlet window, and a surface layer having a higher coefficient of rebound of a collided particle than that of an iron plate surface is formed on an outer surface of the inner cylinder.

2 . A vertical roller mill comprising, in a housing, a fixed cyclone separator configured to separate, when a solid-gas two-phase flow for delivering powder obtained by pulverization of a solid passes through the fixed cyclone separator, fine powder having a small particle size by centrifugal force to flow out to an outside,
wherein the fixed cyclone separator is configured such that after the solid-gas two-phase flow is introduced into the fixed cyclone separator through a fixed blade inlet window opening at a cone-shaped member, the fine powder is flowed out from an upper outlet to the outside by way of a lower end portion of an inner cylinder provided inside the cone-shaped member by swirling the solid-gas two-phase flow by a fixed blade attached to a vicinity of the fixed blade inlet window inside the fixed blade inlet window, and many inclined surfaces configured to rebound a collided particle in a direction away from an outer surface of the inner cylinder and formed into a continuous asperity in a circumferential direction are provided on the outer surface of the inner cylinder.

3 . The vertical roller mill of claim 2 , wherein
the inclined surfaces form a serrated shape of the outer surface as viewed in a cross section.

4 . The vertical roller mill of claim 2 , wherein
each of collision vanes placed on the outer surface forms a corresponding one of the inclined surfaces.

5 . A vertical roller mill comprising, in a housing, a fixed cyclone separator configured to separate, when a solid-gas two-phase flow for delivering powder obtained by pulverization of a solid passes through the fixed cyclone separator, fine powder having a small particle size by centrifugal force to flow out to an outside,
wherein the fixed cyclone separator is configured such that after the solid-gas two-phase flow is introduced into the fixed cyclone separator through a fixed blade inlet window opening at a cone-shaped member, the fine powder is flowed out from an upper outlet to the outside by way of a lower end portion of an inner cylinder provided inside the cone-shaped member by swirling the solid-gas two-phase flow by a fixed blade attached to a vicinity of the fixed blade inlet window inside the fixed blade inlet window, and an inverted conical reflector is placed between an outer surface of the inner cylinder and the fixed blade inlet window and between the outer surface of the inner cylinder and the fixed blade, wherein a distance between the fixed blade inlet window and the inverted conical reflector is shorter than a distance between the fixed blade inlet window and the outer surface of the inner cylinder; and a distance between the fixed blade and the inverted conical reflector is shorter than a distance between the fixed blade and the outer surface of the inner cylinder.

6 . A vertical roller mill comprising, in a housing, a fixed cyclone separator configured to separate, when a solid-gas two-phase flow for delivering powder obtained by pulverization of a solid passes through the fixed cyclone separator, fine powder having a small particle size by centrifugal force to flow out to an outside,
wherein the fixed cyclone separator is configured such that after the solid-gas two-phase flow is introduced into the fixed cyclone separator through a fixed blade inlet window opening at a cone-shaped member, the fine powder is flowed out from an upper outlet to the outside by way of a lower end portion of an inner cylinder provided inside the cone-shaped member by swirling the solid-gas two-phase flow by a fixed blade attached to a vicinity of the fixed blade inlet window inside the fixed blade inlet window, and a surface layer having a lower coefficient of rebound of a collided particle than that of an iron plate surface is formed on a back surface of the fixed blade.

Assignees

• Mitsubishi Hitachi Power Sys

Inventors

• Arima Kenichi
• Matsumoto Shinji
• Daimaru Takuichiro
• Kushioka Kiyonori
• Suga Keishi

Classifications

• B02C23/30

  the applied gas acting to effect material separation (B02C23/34 takes precedence) · CPC title

• B02C2015/002

  combined with a classifier · CPC title

• B07B7/086

  generated by the winding course of the gas stream · CPC title

• B02C15/001

  Air flow directing means positioned on the periphery of the horizontally rotating milling surface · CPC title

• B02C15/00 Primary

  Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs {(high-speed drum mills B02C19/11)} · CPC title