Gas separation – Multiple bag type filters in chamber
Patent
1995-06-27
1996-11-26
Spitzer, Robert
Gas separation
Multiple bag type filters in chamber
55364, 55379, 55380, 55DIG12, B01D 2915
Patent
active
055781004
DESCRIPTION:
BRIEF SUMMARY
The invention relates to improvements applied to bag filters for filtering dust-laden gas, as used to avoid polluting the environment when discharging air to the outside, and for cleaning industrial and/or commercial premises in order to improve the working conditions of personnel and the productivity and the performance of machines that generate dust, but that are sensitive to the presence of dust in the surrounding air, thereby obtaining a quality environment for personnel and for machines.
In general, bag filters known for this purpose comprise an inlet hood for dust-laden gas, in general air, a filter proper, an outlet hood for filtered or "dust-free" gas, an unclogging device, and a device for removing filtered dust.
The inlet hood for dust-laden gas, whose location and shape may be adapted to any configuration, may be in the form of a rectangular parallelepiped, and it may be disposed over the filter proper, assuming that it has horizontal filter bags.
The filter proper includes an enclosure organized as an airtight box containing a battery of tubular filter bags, e.g. of substantially cylindrical or oval section each having a filtering wall, the bags extending parallel to one another and being disposed either vertically or else horizontally between a perforated plate and, in a particular embodiment of the prior art, supporting rods and/or plates and corrugated positioning rods adjacent to a far end of the box remote from its side having the perforated plate. The dust-laden air penetrates into the box from the inlet hood and is then sucked into the insides of the bags, each constituted by a flexible filter medium that is permeable to air (generally a needled felt), on which dust particles having a diameter greater than 0.5 .mu.m, or perhaps greater than only 0.1 .mu.m are deposited. The dust stopped on the outer lateral surface of the bags is then expelled from the bags by an unclogging operation, by blowing back gas in the reverse direction through the bags.
The hood for filtered gas is connected to a gas recirculation duct and is generally in the form of a rectangular parallelepiped, being placed adjacent to the filter box and facing the perforated plate to collect clean gas leaving the filter bags via their end openings each of which is retained in airtight manner, e.g. by an end flange, in a respective hole in the perforated plate. The filtered gas hood is provided with doors giving access to the perforated plate for maintenance and cleaning operations on the filter bags.
The tubular filter medium of each bag is supported, between the perforated plate and the support and positioning means adjacent to the end of the box, by a frame constituted by a basket in the form of a grid, e.g. made of longitudinal and transverse metal wires that are welded together. These gridded supports are of a special shape, of elongate cross-section and oriented vertically, and they may present a roof-shape having two sloping flats extended downwards by corrugated side walls. These gridded baskets supporting the tubular filter bags of substantially oval cross-section with the long axis vertical serve not only to support the filter media in operation, ensuring that there is little mechanical deformation of the media so as to keep fine dust retention qualities intact and to prevent crumpled bags coming into contact with adjacent bags, but also to facilitate installation of the bags in the perforated plate and on the support and positioning means close to the end, and similarly to facilitate withdrawal of the bags. Because of the baskets that they surround, the bags maintain a central section with non-zero flow in spite of the pressure of dust-laden gas which tends to close up each bag, and the roof-shaped top portions of the bags facilitates the shedding of dust towards the collecting hopper, if the bags are horizontal.
Those known bag filters have numerous drawbacks because of the structure of the bags with which they are fitted and because of the retaining and positioning means for the rear portions of the bags adjacent
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Carre Serge
Montaclair Jean-Paul
Hamon Industrie Thermique
Spitzer Robert
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