Low NOX swirl coal combustion burner

US8479668B2 · kind B2 · utility

Assignee

• HARBIN INSTITUTE OF TECHNOLOGY · CN

Inventors

• Zhengqi Li · New York, US
• Zhichao Chen · Calabasas, US
• Rui Sun · Beijing, CN
• Shaozeng Sun · Wanggang, CN
• Shaohua Wu · Nanhu, CN
• Ming Qin · Nanjing, CN
• Hui Liu
• Yunkun Qin · Wanggang, CN

Key dates

• Filing date: Jul 18, 2007
• Grant date: Jul 9, 2013
• Expiry date: Sep 24, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23D2201/20
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A burner includes a primary air-coal mixture duct coaxially extended through a secondary air wind box, a pulverized coal separator supported within the primary air-coal mixture duct, a secondary air duct including an inner secondary air duct and an outer secondary air duct coaxially formed around the primary air-coal mixture duct, a primary air-coal mixture conical outlet coupled with the outlet of the primary air-coal mixture duct, and inner secondary air and outer conical outlets coupled with the outlets of the inner secondary air and outer secondary air ducts respectively. The conical outlets are arranged to delay the mixing time of the primary air-coal mixture and secondary air flows through the primary air-coal mixture and secondary air ducts and to prolong the residence time in the center recirculation zone under the reduction ability so as to effectively reduce the formation of NOx.