Gas separation: processes – Solid sorption – Moving sorbent
Reexamination Certificate
1999-10-14
2001-09-18
Spitzer, Robert H. (Department: 1724)
Gas separation: processes
Solid sorption
Moving sorbent
C095S278000, C096S109000, C096S150000, C096S417000, C055S338000, C055S341200, C055S430000
Reexamination Certificate
active
06290752
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for adsorption or chemisorption of gaseous constituents from a gas flow. The invention furthermore relates to a process for adsorption or chemisorption of gaseous constituents from a gas flow.
2. Description of the Related Art
The publication EP 0,476,300 B1 has disclosed a device and a process for adsorption or chemisorption of gaseous constituents from a gas flow. A drawback of this device and process is that the dust return rate is difficult to maintain, since it is determined by the amount of dust located in the separation plant. A further drawback is the fact that the dusts can only be removed off-line, with the result that a filter chamber has to be taken out of on-line mode into off-line mode, then the filter chamber has to be emptied, in order for the filter chamber then to be returned to the on-line mode.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a device which is economically more advantageous and a process which is economically more advantageous than the prior art devices and processes.
The object is achieved in particular by means of a filter device for adsorption of gaseous constituents from a gas flow, comprising a filter chamber with filters arranged therein, a clean-gas chamber, which is connected to the filter chamber in a fluid-conducting manner via the filters, and a collection chamber, which is arranged beneath the filter chamber, is open toward the filter chamber and has an interior which narrows toward the bottom. An unfiltered-gas duct, which leads from the outside, is arranged in the lower area of the collection chamber, in such a manner that it can be adjusted in the direction toward the filters. Furthermore, a dust-discharge device, which leads toward the outside, is arranged in the lower area.
The unfiltered-gas duct, which can be adjusted in the filter chamber, in particular in the vertical direction, has the advantage that the dust located in the lower area of the collection chamber is picked up by the unfiltered gas flowing in, is thrown upward and, in this way, is recirculated in the filter chamber. The adjustability of the position of the unfiltered-gas duct makes it possible to set the amount of dust which is recirculated. If the unfiltered-gas duct opens out at a relatively low level into the filter chamber, a relatively large proportion of the dust which has collected in the lower area of the filter chamber is picked up and recirculated. If the unfiltered-gas duct opens out at a relatively high level in the filter chamber, the unfiltered gas flowing in has scarcely any entraining action on the dust which is collected in the lower area of the filter chamber, with the result that a relatively small amount of dust is recirculated in the filter chamber. The position of the unfiltered-gas duct, and consequently the amount of dust which is recirculated, can be set using a drive device arranged outside the filter chamber. In addition, a discharge device is arranged in the lower area of the filter chamber allowing the accumulated dust to be removed from the filter chamber in a controllable manner. This discharge device makes it possible to set the total amount of dust or adsorbent located in the filter chamber.
The effect of the dust being entrained by the unfiltered gas which flows in may be influenced within wide limits using additional, suitably arranged flow-influencing means. For example, the untreated-gas duct may open out into a guide element which is, for example, of tubular design. If the unfiltered-gas duct opens out at a relatively low level into the guide element, resulting in a correspondingly low penetration depth, little sucking action is generated in the guide element and little dust is sucked in by the guide element. On the other hand, if the unfiltered-gas duct opens out into the guide element at a relatively high level, so that the unfiltered-gas duct extends over a relatively long distance within the guide element, a greater sucking action is thus generated in the guide element and correspondingly more dust is sucked in by the guide element.
The filter device according to the invention thus makes it possible to set the total amount of dust located in the filter chamber using the discharge device. Moreover, by adjusting the unfiltered-gas duct, it is possible to set the flow of dust, i.e., the mass of dust which is recirculated per unit time in the filter device. In addition to these advantageous setting options, the filter device according to the invention has the advantage that it does not have to be shut down in order for the dust to be removed. The high dust density which is possible or the high recirculation rate which is possible in the filter chamber makes it possible to clean the unfiltered gas very well.
In an advantageous configuration, ceramic filter candles are arranged in the filter device, providing the additional advantage that the device can be operated with flue-gas temperatures of up to 850° C.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
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Flury Rainer
Frey Rudolf
Koller Felix
Cohen & Pontani, Lieberman & Pavane
Spitzer Robert H.
Von Roll Umwelttechnik AG
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