Robert S Trimble

US Patent:

6877980, Apr 12, 2005

Filed:

Mar 14, 2003

Appl. No.:

10/388833

Inventors:

George Stephens - Humble TX, US
David B. Spicer - Houston TX, US
Robert Trimble - Sand Springs OK, US
Gautam Gauba - Marlborough MA, US
Mark E. Bury - Acton MA, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

F23M003/00

US Classification:

431115, 431 9, 431 5, 126 91 A

Abstract:

A burner for use in furnaces such as in steam cracking. The burner includes a primary air chamber; a burner tube having an upstream end, a downstream end and a venturi intermediate said upstream and downstream ends, said venturi including a throat portion having substantially constant internal cross-sectional dimensions such that the ratio of the length to maximum internal cross-sectional dimension of said throat portion is at least 3; a burner tip mounted on the downstream end of said burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of said burner tip; and a fuel orifice located adjacent the upstream end of said burner tube, for introducing fuel into said burner tube.

US Patent:

6890171, May 10, 2005

Filed:

Mar 14, 2003

Appl. No.:

10/388991

Inventors:

George Stephens - Humble TX, US
David B. Spicer - Houston TX, US
James H. Belt - Baytown TX, US
Robert Trimble - Sand Springs OK, US

Assignee:

ExxonMobil Chemical Patents, Inc. - Houston TX

International Classification:

F23C005/00
F23D011/00

US Classification:

431 8, 431159, 431115

Abstract:

An improved burner and a method for combusting fuel in burners used in furnaces such as those found in steam cracking. The burner includes a burner tube having a downstream end and an upstream end for receiving fuel and air, flue gas or mixtures thereof, a fuel orifice located adjacent the upstream end of the burner tube, for introducing fuel into the burner tube, a burner tip mounted on the downstream end of the burner tube and adjacent a first opening in the furnace, the burner tip having a plurality of air flow notches positioned about an outer periphery thereof, a peripheral tile surrounding the outer periphery of the burner tip, forming the first opening in the furnace, and a burner tip seal in contact with at least a portion of the outer periphery of the burner tip and the peripheral tile, wherein a plurality of air gaps is formed between an inner periphery of the burner tip seal and the air flow notches, the plurality of air gaps effective for providing a portion of the air for combustion.