Combustion – Process of combustion or burner operation – Decarbonizing – cleaning or purging
Reexamination Certificate
1999-09-10
2001-11-27
Clarke, Sara (Department: 3743)
Combustion
Process of combustion or burner operation
Decarbonizing, cleaning or purging
C431S160000, C239S424000
Reexamination Certificate
active
06322351
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to combustion of hydrocarbon fuel in a burner and a device for carrying out the combustion process.
2. Description of the Related Art
Hydrocarbon fuel is in the chemical industry usually used in the firing of industrial furnaces and process heaters and to supply heat to heat requiring reactions proceeding in reaction vessels provided with appropriate burners.
A general drawback of the known burners is damage of the burner face at high fuel gas velocities, as required for industrial burners and metal dusting caused by corrosive atmosphere to which the burner's surface is exposed at high temperatures.
U.S. Pat. No. 5,496,170 discloses a swirling flow burner with improved design to prevent hot combustion products from internal recycling through a combustion adjacent to the burner face. Thereby, damage of the burner face caused by the hot combustion products is substantially prevented.
SUMMARY OF THE INVENTION
It has now been observed that metal dusting and carburization of industrial burners being subjected to corrosive atmosphere is substantially avoided when directing a protective atmosphere along the outer surface and face of the burner body in an amount sufficiently to dilute or displace the corrosive atmosphere around the burner surface.
Accordingly, this invention is a process for the combustion of hydrocarbon fuel in a burner being exposed to corrosive atmosphere, wherein a non-corrosive atmosphere is passed along outer surface of the burner to protect the surface from contact with the corrosive atmosphere. Suitable non-corrosive atmosphere will be any gaseous medium, which does not cause metal dusting or carburization reactions on metallic surfaces at elevated temperature.
Suitable non-corrosive atmospheres included steam H
2
, CO
2
and nitrogen or mixtures thereof.
Furthermore, the invention provides a burner for the combustion of hydrocarbon fuel with an oxidant comprising within an outer metallic surface passages for supplying fuel and oxidant, and an orifice for combustion of the fuel with the oxidant, the improvement comprising a wall concentrically and spaced apart surrounding at least part of the outer metallic surface of the burner and being adapted to introduce and passing a protective atmosphere along the surface.
When operating the above burner in a reactor, the wall may be formed by refractory lining material at top of the reactor surrounding the outer surface of the burner in a suitable distance and, thereby, forming passageway for introduction and passage of the protective atmosphere during operation of the burner.
REFERENCES:
patent: 733579 (1903-07-01), Fitton
patent: 4986748 (1991-01-01), Brown et al.
patent: 5496170 (1996-03-01), Primdahl et al.
patent: 5515794 (1996-05-01), Kassman et al.
patent: 6193173 (2001-02-01), Bodelin et al.
patent: 60-171310 (1985-09-01), None
Christensen Peter Seier
Christensen Thomas Sandahl
Holm-Christensen Olav
Ivarsen Primdahl Ivar
Clarke Sara
Haldor Topsoe A/S
Ostrolenk Faber Gerb & Soffen, LLP
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