Method and apparatus for combustion with a minimum of NOx emission

Patent 4439137 Issued on March 27, 1984. Estimated Expiration Date:

September 28, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

1953275

2140088

2458543

2834407

3771944

Low NO_x emission burners
Patent #: 3957420
Issued on: 05/18/1976
Inventor: Asai , et al.

Method and apparatus for reducing NO_x from furnaces
Patent #: 4021186
Issued on: 05/03/1977
Inventor: Tenner

Combustion apparatus
Patent #: 4162890
Issued on: 07/31/1979
Inventor: Hirose

Fuel combustion method and burner for furnace use Patent #: 4357134
Issued on: 11/02/1982
Inventor: Katsushige , et al.

Inventors

Assignee

Kobe Steel, Ltd.

Application

No. 06/425701 filed on 09/28/1982

US Classes:

431/8, Flame shaping, or distributing components in combustion zone431/10, Oxidizer added to region of incomplete combustion431/181, Plural feed means extending to common wall opening of furnace431/187, Feeds discharged coaxially431/190Water, air or steam feeder spaced from disperser

Examiners

Primary: Dority, Carroll B.

Attorney, Agent or Firm

Oblon, Fisher, Spivak, McClelland & Maier

International Class

F23C 7/00 (20060101)

Foreign Application Priority Data

1978-12-21 JP

Abstract

A method an apparatus for combustion with a minimum of NOx emission in various industrial furnaces and boilers. By injecting air for combustion into a furnace through the burner tile or air baffle in the deviated flow pattern asymmetrical with respect to the burner tile or baffle axis, the quick mixing of the air and fuel in early stages of combustion is suppressed to provide for a relatively gentle combustion and allow the burnt gas self-circulation to take place effectively, thereby minimizing the emission of nitrogen oxides.