Gas separation – With nonliquid cleaning means for separating media – Cohesive filter media cleaning
Patent
1998-06-09
2000-02-08
Smith, Duane S.
Gas separation
With nonliquid cleaning means for separating media
Cohesive filter media cleaning
95280, B01D 4604
Patent
active
06022388&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for cleaning filter elements, such as filter bags, having upper open ends, in a filter installation for filtering of polluted gas passing, during operation, from the outside and through said filter elements (2, 2'). The filter elements in the installation are juxtaposed in a plurality of essentially parallel rows. The device has an essentially horizontal distribution pipe, which extends essentially in parallel with the rows of filter elements and is adapted to be connected to a pressure medium source via a valve. The device further comprises a plurality of nozzle elements, which are connected to the distribution pipe.
DESCRIPTION OF THE PRIOR ART
A known filter installation of the above-mentioned type consists of a plurality of parallel filter chambers, each containing a plurality of parallel rows of vertically arranged filter elements in the form of filter bags having upwardly directed openings. A polluted gas, from which dust is to be separated, is conducted through the filter chambers to be filtered and cleaned. The polluted gas is conducted into the filter bags via the walls thereof, and the cleaned gas is discharged from the filter bags via the openings thereof. The cleaned gas is discharged into a nozzle house associated with the respective filter chambers so as to be conducted, via outlet valves, to an outlet duct which is common to the filter chambers. On the clean gas side in the filter bags as well as in the nozzle house, there prevails during operation a negative pressure, which is normally generated by a fan which is arranged on the clean gas side downstream of the filter installation.
As the gas passes from outside and through the filter bags, the gas is cleaned by its dust being deposited on the exterior of the filter bags while forming a dust cake. The cleaning of the filter bags to remove this dust cake is carried out by a pressure medium in the form of compressed air pulses being injected into the filter bags in a direction opposite to the gas filtering direction. The rows of filter bags are cleaned successively, a compressed air pulse being generated and transmitted at the same time to all filter bags in a row by means of a cleaning unit arranged for each row. Each such cleaning unit comprises in the nozzle house a nozzle pipe, which extends above and in parallel with the associated row of filter bags, and a nozzle pipe bend connected thereto. The nozzle pipe has a distribution pipe with a plurality of vertically downwardly projecting pipe sockets which are connected thereto and which are each positioned straight above a filter bag opening in the row. The function of these pipe sockets is to direct, by deflecting, the compressed air pulse via nozzles into the respective filter bags. The pipe sockets usually have a diameter which is 1.5-2 times greater than the diameter of the nozzle of the respective pipe sockets. The nozzles consist of circular holes of varying diameter, which are formed in the distribution pipe. The distribution of the diameters of the nozzles along the nozzle pipe is determined empirically in relation to its total number of nozzles, thereby obtaining a uniform distribution of the compressed air pulse. The function of the nozzles thus is to distribute, by throttling, the compressed air pulse along the nozzle pipe.
One end of the nozzle pipe is closed and the other end is connected to a 90.degree. nozzle pipe bend. The nozzle pipe bend, which extends through the roof of the nozzle house, is in turn connected to a vertical pressure pipe, which is attached by welding to a compressed air tank, which is common to all nozzle pipes in one and the same filter chamber, via a valve which is mounted on the compressed air tank. The valve can be of e.g. the type disclosed in Swedish Patent Specification 9303679-6. The elements here defined thus constitute the above-mentioned filter bag cleaning unit.
During cleaning of the filter bags, the valve is temporarily opened to establish a connection between the compressed
REFERENCES:
patent: 1995650 (1935-03-01), Rathbun
patent: 3837150 (1974-09-01), Kubiak
patent: 4319897 (1982-03-01), Labadie
patent: 4775398 (1988-10-01), Howeth
patent: 5062867 (1991-11-01), Klimczak
patent: 5180110 (1993-01-01), Brame
patent: 5395409 (1995-03-01), Klimczak
patent: 5533706 (1996-07-01), Aurell
patent: 5549734 (1996-08-01), Standard
patent: 5571299 (1996-11-01), Tonn
Alterby Ulf
Andersson Bernt
ABB Flakt AB
Smith Duane S.
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