Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Patent
1997-07-17
1999-03-23
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
4232451, 4232453, 422168, 422173, 422177, 422234, 422239, B01D 5344, B01J 812
Patent
active
058855378
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This application is a national stage filing under 35 U.S.C. .sctn.371 of PCT/BE96/00004 filed 16 Jan. 1996.
The present invention concerns a method for purifying gases which contain thermally decomposable components, whereby these thermally decomposable components are thermally decomposed.
2. Related Technology
By thermally decomposable components are mainly understood volatile organic components which usually give off an unpleasant smell. Such components are for example aromatic or aliphatic compounds.
Due to the decomposition, these decomposable components are decomposed in harmless end products.
In particular, the invention concerns a method for decomposing thermally decomposable components, in particular volatile organic components which are present in gases, whereby these gases are led through a heat exchange medium consisting of particles which resist the decomposition temperature, and whereby these gases are heated in said heat exchange medium up to the decomposition temperature of the decomposable components. The gases may be derived from the drying and/or burning of organic waste and may largely consist of steam.
In a known method of the above-mentioned type, the gases are carried downward by means of a stationary heat exchange medium consisting of ceramic rings, in which is erected an electrical heat resistor.
In this known method, the heat exchange medium is polluted relatively fast, so that it has to be replaced relatively quickly.
This known method cannot be used for damp gases.
BRIEF SUMMARY OF THE INVENTION
The invention aims a method for decomposing thermally decomposable components which are present in gases, with an excellent heat exchange, whereby the heat exchanging mass has to be replaced less quickly and whereby this method can also be used for damp gases.
This aim is reached according to the invention in that the heat exchange medium is continuously carried around and consequently carried away from a first zone in which this heat exchange medium heats the gases and is again carried towards a second zone in which the heat exchange medium is heated, at least partly by the waste gases of the combustion of the decomposable components and/or of the decomposition products thereof and by the remainder of the gases which were further heated by this combustion, which combustion mainly takes place in a combustion zone situated between these zones.
The carrying around of a heat exchange medium through which gases flow is known from U.S. Pat. No. 2,363,575, but the heat exchange medium is an adsorbent which is mainly used for drying air in a topmost zone, whereas in a bottommost zone, the adsorbent is dried by other air which is heated by a burner. It is mentioned that the adsorbent can be a catalyst, whereby a catalytic reaction in this case takes place in the topmost zone and whereby the catalyst is purified of adsorbed reagents and products in the bottommost zone.
According to a particular embodiment of the invention, external calorific value is supplied to the combustion zone.
In the first and the second zone, the heat exchange medium is for example moved down through due to gravitation.
The gases are preferably lead in a cross-current manner over the heat exchange medium, in such a manner that they cross said heat exchange medium several times.
A suitable heat exchange medium is a granulated mass.
The invention also concerns a device which is particularly suitable to carry out the method according to any of the above-described embodiments.
Thus, the invention concerns a device for thermally decomposing thermally decomposable components which are present in gases, characterized in that it contains a tower with three coaxial cylindrical standing casings including an inner casing provided with openings which is closed at the bottom and at the top, a second casing provided with openings erected around this inner casing and an outer casing which surrounds this second casing. Walls are provided in the space between the second casing and th
REFERENCES:
patent: 2445554 (1948-07-01), Bergstrom
patent: 2636575 (1953-04-01), Watson
patent: 4102776 (1978-07-01), Stone
patent: 4531907 (1985-07-01), Kawamura
patent: 5762010 (1998-06-01), De Muynck
Druwel Norbert
Groep Danis, naamloze vennootschap
Straub Gary P.
Vanoy Timothy C
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