Circulating fluidized bed boiler

US10156354B2 · kind B2 · utility

Assignee

• Institute of Engineering Thermophysics, Chinese Academy of Sciences · CN

Inventors

• Qinggang Lv · Beijing, CN
• Yunkai Sun · Beijing, CN
• Guoliang Song · Beijing, CN
• Dongyu Wang · Blacksburg, US
• Shaolin Bao · Beijing, CN
• Ming Gao · Shanghai, CN
• Shiyuan Li · Beijing, CN

Key dates

• Filing date: Oct 27, 2011
• Grant date: Dec 18, 2018
• Expiry date: Aug 7, 2033

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23C10/18
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A circulating fluidized bed boiler is disclosed. The circulating fluidized bed boiler comprising: a furnace defined and enclosed by water walls, a ceiling and an air distributor, the water walls comprising front and rear walls and left and right side walls (AJ, TK) formed by water cooling tubes, and the water walls are provided with secondary air ports (Y) in the lower part thereof, and furnace flue gas outlets (AB, EF, IJ, KL, OP, ST) being provided in an upper part of the furnace; at least two cyclones connected with the furnace flue gas outlets (AB, EF, IJ, KL, OP, ST); a loop-seal is connected with solid outlets of the cyclones and the lower part of the furnace, respectively; and a flue gas duct connected with flue gas outlets of the cyclones wherein the water cooling wall tubes of the water wall form at least one vertical columnar recessed segment (BCDE, FGHI, SRQP, ONML) recessed toward the inside of the furnace, and the at least one columnar recessed segment (BCDE, SRQP, ONML) extends at least 15% of the furnace height in a vertical direction.