Combustion – Fuel disperser installed in furnace – Plural feed means extending to common wall opening of furnace
Reexamination Certificate
2000-05-16
2001-05-29
Price, Carl D. (Department: 3743)
Combustion
Fuel disperser installed in furnace
Plural feed means extending to common wall opening of furnace
C431S159000, C431S187000, C431S005000, C431S008000, C431S010000
Reexamination Certificate
active
06238206
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to burner assemblies, and particularly, to a low-emissions industrial burner. More particularly, the present invention relates to a low-emissions industrial burner for burning a combustible mixture to produce a flame.
One challenge facing the burner industry is to design a burner with minimal parts that produces low nitrogen oxide (NO
x
) emissions during operation. Typically, a mixture of gaseous fuel and either air or oxygen in the proper ratio is created in an industrial burner to produce a combustible fuel-and-air mixture. The mixture is then ignited and burned to produce a flame that can be used to heat various products in a wide variety of industrial applications. However, when the fuel and air are not mixed completely or are not mixed in the proper ratio, combustion of fuel such as natural gas, oil, liquid propane gas, low BTU gases, and pulverized coals often produce high levels of several unwanted pollutant emissions such as nitrogen oxide (NO
x
), carbon monoxide (CO), and total hydrocarbons (THC).
According to the present invention, a burner is provided having an outer tube defining a flow passage and an inner tube being positioned to lie in the flow passage. The outer tube includes an inlet portion having a large diameter, an outlet portion having a small diameter that is smaller than the large diameter of the inlet portion, and a nozzle portion interconnecting the inlet and outlet portions. The inlet portion of the outer tube is adapted to be coupled to an air supply to conduct air through the flow passage. The inner tube includes an inlet end that is adapted to be coupled to a fuel supply and is formed to include at least one fuel-injection hole to conduct fuel from the fuel supply into the flow passage to establish a combustible air-and-fuel mixture within the flow passage.
In one preferred embodiment, the burner is coupled to a long refractory block. The long refractory block extends beyond the outlet end of the burner and creates a flame chamber within the refractory block for containing the flame. The fuel-injection holes formed in the inner tube are preferably positioned in the outlet portion of the outer tube. However, the fuel-injection holes can also be positioned in the nozzle portion or inlet portion of the outer tube and/or an air-and-fuel mixture can be supplied at the inlet end of the burner.
In a second embodiment, a burner is coupled to a short refractory block. The short refractory block terminates prior to the outlet end of the burner so that the outlet end of the burner extends beyond the refractory block. This allows an air-and-fuel mixture discharged from an exit end of the burner to mix with recirculated furnace gas contained in a furnace chamber in which the flame burns because the flame is not contained within a flame chamber defined by the refractory block.
Additional features of the present invention will become apparent to those of ordinary skill of the art upon consideration of the following detailed description of preferred embodiments exemplifying the best mode of carrying out the invention as presently perceived.
REFERENCES:
patent: 1669810 (1928-05-01), Clapham
patent: 2771744 (1956-11-01), Johnson et al.
patent: 4457696 (1984-07-01), Schwartz et al.
patent: 5087194 (1992-02-01), Viessmann
patent: 5380194 (1995-01-01), Polomchak et al.
patent: 3702415 C1 (1988-04-01), None
Cummings, III William G.
Taylor Curtis L.
Barnes & Thornburg
Maxon Corporation
Price Carl D.
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