Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Waste gas purifier
Patent
1990-08-07
1991-08-20
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Waste gas purifier
422183, 110214, B01D 5334, B01D 5336, F23D 500, F23D 900
Patent
active
050412680
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a reactor for reducing the contents of nitrogen oxides and sulphur oxides in combustion gases, which reactor comprises a post-combustion chamber to be connected together with or after a combustion chamber.
A major problem in the combustion of liquid and solid fuels is the content of sulphur oxides and nitrogen oxides present in the flue gases. Thus, many attempts have been made to reduce this oxide content, both by flue gas cleaning and by catalytic treatment of the exhaust gases.
The invention is based on the insight that it is possible to reduce the content of nitrogen oxides and sulphur oxides to a considerable extent if it is ensured that suitable oxidation and temperature conditions prevail in the passageway between the combustion chamber and the chimney.
Swedish Patent 7804761-0 (SE-B-413,158) discloses an apparatus for the combustion of a mixture of gaseous or particulate, combustible material and combustion air. This apparatus is used for combusting various gaseous or particulate materials containing carbon or carbon compounds, in such a complete manner that the combustion gases emitted are practically free from soot, carbon monoxide and hydrocarbon residues. It is, however, not stated in the patent specification that the apparatus can be used for reducing the contents of nitrogen oxides and sulphur oxides in combustion gases.
U.S. Pat. No. 4,481,889 discloses a method for afterburning flue gases by conducting the impure gases through a burner in an afterburner in which the exhaust gases, by being positively mixed with a combustion gas, are subjected to complete combustion. In this process, combustible gases are thus supplied to bring about afterburning of the flue gases.
DE-A-3,014,590 discloses a pre-combustion chamber for an oil- or gas-fired, fan-supported burner. This pre-combustion chamber serves to shape the generated flame and to retard it before entering the combustion chamber. This apparatus thus serves as an intermediary between the burner and the combustion chamber, whereas not as a reactor for reducing the contents of nitrogen oxides and sulphur oxides in combustion gases.
SUMMARY OF THE INVENTION
A reactor is provided for reducing the contents of nitrogen oxides and sulphur oxides in combustion gases. The reactor is in the form of a post-combustion chamber to be connected after a combustion chamber. The reactor has a casing including a generally cylindrical main part transforming at its top into a dome-shaped outlet part with an outlet opening. Around the casing of the reactor, there is provided a heat-insulated wall whose inner side has substantially the same shape as the casing and which is eccentrically disposed in relation to the casing. The casing of the reactor accommodates a partition which is conical and has its apex directed towards the outlet opening. A gap is formed between the shell and the partition. At the inlet end of the shell, an inlet funnel is provided at a certain distance from the inlet end so as to form a gap. A heat exchanger is provided for preheating secondary air supplied through a secondary air intake into the gap between the casing and the wall at a certain distance from the opening. At the bottom, the gap is connected to a collecting box and an outlet pipe.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail hereinbelow with reference to the accompanying drawings illustrating two embodiments of the device according to the invention.
In the drawings
FIG. 1 is a vertical section schematically showing an embodiment of the reactor according to the invention;
FIG. 2 is a section taken along the line II--II in FIG. 1.
FIG. 3 is a vertical section schematically showing an incineration plant using another embodiment of a reactor according to the invention; and
FIG. 4 shows yet another embodiment of a reactor according to the invention .
DETAILED DESCRIPTION
The arrangement shown in FIG. 1 comprises a reactor for reducing the contents of nitrogen oxides and sulph
REFERENCES:
patent: 4262609 (1981-04-01), Inovius
patent: 4363785 (1982-12-01), Willson
patent: 4481889 (1984-11-01), Sikander et al.
patent: 4762074 (1988-08-01), Sorensen
patent: 4830833 (1989-05-01), Shaff
Blythe Stephanie
Warden Robert J.
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