Vertical roller mill

US8622328B2 · kind B2 · utility

Assignee

• Mitsubishi Electric Corporation · JP

Inventors

• Shinji Matsumoto · Tokyo, JP
• Takashi Tsutsuba · Tokyo, JP
• Koki Matsuzaki · Tokyo, JP
• Sotaro Yamaguchi · Tokyo, JP
• Yasuhiro Sueoka · Tokyo, JP
• Kenichi Arima · Tokyo, JP
• Tsugio Yamamoto · Nagasaki, JP
• Takuichiro Daimaru · Tokyo, JP

Key dates

• Filing date: Aug 22, 2011
• Grant date: Jan 7, 2014
• Expiry date: Aug 22, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23K2201/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a vertical roller mill in which a fixed-type cyclone sorter is provided in a casing, the fixed-type cyclone sorter includes a conical member; a fixed-blade entrance window through which a solid-gas two-phase flow is introduced into the interior of the conical member; a flat plate-like fixed blade that causes the solid-gas two-phase flow to spiral; an inner cylinder into which pulverized coal is guided from the bottom end thereof toward the top end thereof by means of spiraling of the solid-gas two-phase flow; and a pulverized-coal exit through which the pulverized coal guided to the top end of the inner cylinder is guided outside the conical member, wherein the fixed blade is provided with a tip portion where a downward flow is increased for the solid-gas two-phase flow guided into the interior of the conical member from the fixed-blade entrance window.