Dust filter

Details Dust filter Dust filter

2000-05-05

2001-09-18

Simmons, David A. (Department: 1724)

Gas separation

With nonliquid cleaning means for separating media

Cohesive filter media cleaning

C055S283000, C095S278000, C095S280000

Reexamination Certificate

active

06290737

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a dust filter, e.g., bag filter, in particular its accommodation in a tank and valve. Such dust filters are used to remove dust from conveying air, etc.
2. Description of the Related Art
Dust filters include cartridge candle filters or bag filters. Bag filters include dust separators with tubular filter elements, e.g., made out of needled felt or treated fabric. The individual filtering bags are arranged in a shared casing, and form a raw gas room. The filtering bags are detachably connected to corresponding intermediate floors and, when suspended, the pure gas room is located above this intermediate floor, and can be connected using a valve arrangement to both to a scavenging air channel and a pure gas channel for removing the purified air. The lower area of the casing or raw gas room accommodates a discharge for removing the filtered dust.
Such bag filters are described in DE-A-3939645 or DE-A-4029994, for example.
In such a bag filter, the raw gas entering the raw gas room via the raw gas line arrives at the outer wall of a filtering bag, so that the particles entrained by the raw gas are held back by the filtering bag, and the pure gas rises inside the filtering bag, where it finally is evacuated in a pure gas line, and is again available for use. Larger particles fall downward inside the raw gas room, and are removed in the floor area of the filter, e.g., by means of a cellular wheel sluice. Smaller particles initially accumulate on the outside surfaces of the filtering bags, and must be periodically removed, e.g., via scavenging air (compressed air).
In DE-A-4411988, a bag filter arrangement accommodates at least one filtering bag in a raw gas room, from which pure gas is removed, and the filtering bag is cleaned via internal pressurization with a gas burst (jet burst). Also known to this end is an arrangement for generating compressed air bursts (DE-U-9012518) for purification purposes, which contains a compressed air container equipped with compressed air connections, whose walls incorporate several, each separate diaphragm corner valves, to which are connected compressed air pipes that are routed transversely through the compressed air tank and can be hooked up to a bag filter system.
According to DE-A-3045759, the open end of each bag filter accommodates an air nozzle that is mounted in a frictional and form-fitting manner.
SUMMARY OF THE INVENTION
The object of the invention is to simplify the cleaning of dust filters with compressed air and reduce the structural outlay for preparing the compressed air. The object is achieved by designing the pure gas room as a compressed air tank.
This makes it possible to eliminate the individual supply lines and control fittings to a large extent, and the intermediate floor between the pure gas and raw gas room accommodates only those air nozzles allocated to the filter elements that can be individually actuated. The lid acts as a cover and compressed air tank all in one.
The omission of fittings for scavenging and control air simplifies the assembly and maintenance, and just a general supply of compressed air is now necessary. The available room can be optimally used, or the necessary room can be tangibly reduced.
As usual, a filter casing contains a supply line for dust-carrying raw gas to route the raw gas into the filter casing (raw gas room), and hence to the filter elements. Discharge arrangements for the accumulated dust particles are arranged in the lower area of the raw gas room, under the filter elements. The raw gas room is separated from the pure gas room by an intermediate floor. The intermediate floor accommodates both the attachments for the filter baskets of the filter elements, along with the tank floor air nozzles/valves for cleaning the filter elements.
In the following, the invention will be described in more detail in an embodiment of a bag filter based on a drawing. The drawing shows:


REFERENCES:
patent: 4247310 (1981-01-01), Borst
patent: 4433986 (1984-02-01), Borst
patent: 5022897 (1991-06-01), Balcar et al.
patent: 5328492 (1994-07-01), Zievers et al.
patent: 5458665 (1995-10-01), Martin et al.
patent: 5514195 (1996-05-01), Durst et al.
patent: 6149716 (2000-11-01), Bach et al.
patent: 3045759 A1 (1982-06-01), None
patent: 9012518 (1991-03-01), None
patent: 4029994 A1 (1992-03-01), None
patent: 94077980 (1994-08-01), None
patent: 9407798 (1994-09-01), None
patent: 19512289 A1 (1995-10-01), None
patent: 3939645 (1996-03-01), None
patent: 2088634 (1971-12-01), None
patent: 2088634A (1972-01-01), None
patent: 2397219A (1979-02-01), None
patent: 2397219 (1979-02-01), None
International Search Report for PCT/CH 98/00139, date of mailing Aug. 7, 1998.
Statement of Relevance of DE-U-9012518.

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