Gas separation – With nonliquid cleaning means for separating media – Cohesive filter media cleaning
Patent
1992-12-16
1993-12-21
Hart, Charles
Gas separation
With nonliquid cleaning means for separating media
Cohesive filter media cleaning
553411, B01D 4604
Patent
active
052717526
DESCRIPTION:
BRIEF SUMMARY
This invention bears upon a device for mounting substantially vertical bag-shaped filter elements in a filtering chamber in a filtering installation for cleaning contaminated gases which are conducted into said filtering chamber to be filtered by the bag-shaped filter elements and conducted, via the bag openings, to a chamber for clean gas which is located above and separate from said filtering chamber and from which the gases are discharged from the filtering installation.
In conventional filtering installations, the filtering chamber or raw-gas chamber is separated from the superior clean-gas chamber by means of a horizontal metal sheet. The bag-shaped filter elements are suspended from the sheet, the bag openings being closely applied against the underside thereof. Further, the metal sheet is formed with a plurality of rows of through holes, each of which is located opposite to a bag opening. The contaminated gases are conducted into the filtering chamber and pass through the filter-bag walls, so that dust contained in the contaminated gases is filtered off and adheres to the walls. The filtered gases are thereafter conducted up through the bag-shaped filter elements and, via the bag openings and the metal-sheet holes, into the clean-gas chamber whence they are discharged from the installation.
A plurality of tubes, which are equipped with nozzles in the same spaced-apart relationship as the holes in each row in the metal sheet, are mounted at a distance above the sheet. Each tube is so mounted along a row of holes that the nozzles are vertically aligned with the holes, and consequently with the corresponding bag openings. The nozzle tubes are connected to a pressure tank via a control valve device adapted to impart brief pressure pulses to said tubes and their nozzles in order to clean the bag-shaped filter elements. The pressure pulses knock the dust from the filter-bag walls, and the thus-released dust then drops into hoppers arranged underneath the bag-shaped filter elements.
Theoretically, this mounting of the nozzle tubes should be the optimal one, the nozzles and the sheet holes being vertically aligned with one another. In actual practice, however, such optimal mounting is extremely difficult to achieve, not only owing to manufacturing tolerances resulting in a spaced-apart relationship of the nozzles which is different from that of the sheet holes and in a slightly offset nozzle arrangement, but also because it is extremely difficult to mount the nozzle tubes in exact positions along the rows of holes in the metal sheet mounted in the filtering installation. In actual practice, the nozzles are therefore frequently slightly offset in relation to the holes in the metal sheet. This reduces the effect of the pressure pulses, and at least some bag-shaped filter elements are not properly cleaned. It goes without saying that this impairs the cleaning capacity of the filtering installation.
The above-described conventional installations are so designed that the contaminated gases are conducted into the filtering chamber on a level with the lower portion of the bag-shaped filter elements, resulting in upwardly-directed gas flows also outside the bag-shaped filter elements. These gas flows make it more difficult for the dust released from the filter-bag walls by the pressure pulses to drop into the hoppers. Thus, some of the released dust remains suspended in the spaces between the bag-shaped filter elements, and may again adhere to the filter-bag walls. Naturally, this also impairs the cleaning capacity of the filtering installation.
The object of the present invention is to provide a device for mounting bag-shaped filter elements in a filtering chamber, said device being designed to obviate the above capacity-reducing drawbacks.
According to the invention, this object is achieved by a device which is of the type described in the introduction to this specification and which is characterised by a substantially horizontal, lower tubular element which forms a clean-gas chamber and has a series of first thr
REFERENCES:
patent: 3535851 (1970-10-01), Riemsloh
patent: 3733784 (1973-05-01), Anderson et al.
ABB Flakt AB
Hart Charles
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