Method for combusting fuel in a fired heater

Details Method for combusting fuel in a fired heater Method for combusting fuel in a fired heater

2004-02-18

2008-12-23

Basichas, Alfred (Department: 3749)

Combustion

Process of combustion or burner operation

Flame shaping, or distributing components in combustion zone

C431S010000

Reexamination Certificate

active

07467943

ABSTRACT:
A method for combusting fuel in a fired heater having one or more burners, the method. comprising: (a) combusting at least a portion of the fuel in the. presence of an oxidizer in the burners,. generating heat and producing a flue gas; and (b) recycling at least a portion. of the flue gas to. the burners;. wherein step (a) and step (b) are conducted in a manner such that the combusting takes place in a combustion regime represented. by 4,500−7554.8−933.72x+64.960x2+0.47705y−0.55680z1579.22,500; W wherein w represents a mole fraction of oxygen. in the oxidizer, x represents a recycle ratio of the flue as measured in moles of flue gas/mole of oxidizer; wherein y represents a temperature of the. flue gas in Fahrenheit recycled to the burners; and wherein. z represents a heating. value of the fuel in Btu/scf LHV.

REFERENCES:
patent: 4030874 (1977-06-01), Vollerin
patent: 5154599 (1992-10-01), Wunning
patent: 5790420 (1998-08-01), Lang

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