Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Molecular oxygen or ozone component
Reexamination Certificate
1998-05-08
2003-06-24
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Molecular oxygen or ozone component
C423S351000, C423S437100
Reexamination Certificate
active
06582671
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to an apparatus and a method for reducing oxygen content in a boiler exhaust gas.
It has been a conventional practice to press nitrogen gas into an oil field to maintain the pressure of an oil reservoir or to dissolve nitrogen gas in oil to form a so-called miscible condition, thereby heightening the fluidity of the oil in an oil reservoir.
Here, as a nitrogen gas source, nitrogen gas separated from oxygen by the low temperature processing of air is employed. The separation of nitrogen gas, however, requires a tremendous power and furthermore, the cost of the apparatus is markedly high.
There is accordingly a demand for countermeasures for obtaining nitrogen gas at a low power and a low cost.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide an apparatus and a method for reducing oxygen content in a boiler exhaust gas, which makes it possible to prepare nitrogen gas at a low power and a low cost.
In accordance with the present invention, the above-described object is attained by an apparatus for reducing oxygen content in a boiler exhaust gas, which comprises a combustion catalyst portion disposed downstream or at the intermediate portion of a convectional heat transfer portion of a boiler and a fuel supply apparatus for supplying an oxygen reducing fuel to a position just before said catalyst combustion portion.
The present invention includes a method for reducing oxygen content in an exhaust gas from a boiler, which comprises supplying an oxygen reducing fuel to the exhaust gas at just before a combustion catalyst portion disposed downstream or at the intermediate portion of a convectional heat transfer portion of the boiler, burning said oxygen reducing fuel at said combustion catalyst portion to increase CO
2
content and reduce oxygen gas content, to thereby obtain an exhaust gas which is composed mainly of nitrogen gas with an oxygen gas concentration not greater than 1,000 ppm.
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Marzo Et Al., “Destroy NoxCatalytically” Hydrocarbon Proc. vol. 59. No. 2 pp. 87-89, Feb. 1980.*
“Boiler and Appartus for Boiler House”; Jun. 1995.
Iijima Masaki
Imai Tetsuya
Birch & Stewart Kolasch & Birch, LLP
Mitsubishi Heavy Industries Ltd.
Silverman Stanley S.
Vanoy Timothy C.
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