Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
  • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
  • B01D46/0087—Bypass or safety valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
  • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
  • B01D46/2411—Filter cartridges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
  • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
  • B01D46/60—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel arranged concentrically or coaxially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
  • B01D2273/10—Allowing a continuous bypass of at least part of the flow, e.g. of secondary air, vents

Definitions

• the prior art relates to a filter for the removal of particles from gas flows, such as from air, smoke and residual gases, said filter being constructed as a so-called cassette filter in which filter elements extend between the inlet side and the outlet side of the filter, and wherein the filter element comprises a ring-shaped innermost filter, which forms a central filter chamber, a further ring-shaped middle filter around said filter, as well as an outermost ring-shaped filter extending around the middle filter, said filters being secured at the inlet side and the outlet side of the filter, respectively.
• cassette filters are known in various embodiments. As indicated by the name, they are constructed as cassettes which may be inserted into a reception chamber, so that they may be mounted and removed, as needed.
• the filter element itself comprises a plurality of filters, each of which has the shape of a box which is open to the outlet side.
• the rear side of the box faces toward the inlet side of the filter.
• these filter boxes are arranged upright, so that the filters extend vertically, and so that a plurality of filter boxes, e.g. four, constitute the overall filter area for the cassette.
• cassette filters with three filter elements, where the innermost and outermost filter elements extend obliquely outwards from the inlet side.
• the object of the invention to remedy these drawbacks of known filters, and this is achieved according to the invention in that the individual filters are pleated in their entire extent, length and circumference between their inlet and outlet sides, and that openings are provided along the lower side of the outermost filter on the outlet side, said openings being formed by removal of or omission of adhesive between the pleats along the lower edge.
• the filter element is stable because of the pleating, that is dimensionally stable, and that the outermost filter layer will be able to discharge, that is drain, any liquid, and, thereby, that the filter is dimensionally stable and is capable of operating even in case of moist gas flows and/or condensed liquid, without losing its stability.
• the outlet openings are provided by removing or omitting adhesive between the pleats, a simple and effective drain is achieved, without the pleats being damaged.
• the filter elements may be built together, be built in, similar to known cassette filters.
• this filter for the filtration of gas, including moisture-containing flows, as it has a great filter capacity and a small pressure loss.
• FIG. 2 shows a section, indicated by a circle in fig. 2, of a lowermost part of the outermost filter and the frame.
• Fig. 1 shows an example of a cassette filter according to the invention seen toward its inlet side - that is the side into which the gas flow is conveyed. It will be seen on the drawing how the inlet side and the outlet side are configured, viz. partly as a circular side, partly as a quadrangular side.
• the inlet side has two gas inlets, viz. partly a ring-shaped slot 16, partly the inlet from the outside, as indicated by an arrow 3. This latter gas flow passes through the outermost filter 4, as will be described later.
• the effective filter area will constitute 21 m 2 .
• fig. 3 is a longitudinal section of the filter shown in fig. 2.
• the top of fig. 3 shows the inlet side where gas flows 7 and 8 are indicated by arrows.
• the individual filter elements are ring-shaped and comprise an outermost filter element 4, a middle filter element 5 and an innermost filter element 6.
• These three filter elements are made of a generally known filter cloth, and they are pleated in their entire extent in the longitudinal direction as well as in the annular direction. This in order to make the filter area as large as possible and also to impart a suitable rigidity and thereby dimensional stability to the elements.
• the outermost filter element 4 and the innermost filter element 6 extend obliquely outwards between the inlet side and the outlet side, while the middle filter element 5 extends obliquely inwards. The purpose of this is to create chambers which serve as sluice chambers on the outlet side of the elements, and which are so large as to provide an even and unobstructed gas flow through the filter elements.
• the inlet gas flow 8 through the ring-shaped inlet slot is conveyed through the innermost filter element 6 into the central chamber 15.
• the inlet to this central chamber 5 is blocked or closed by means of a cover or a plate 12, which extends at the end of the innermost filter element 6.
• the outer gas flow 7 is conveyed through the outermost filter element 4 and into the outermost chamber 17.
• an adhesive is used in a known manner as a binding and sealing means between the ring 1 on the inlet side and the ring 10 and the frame 9 on the outlet side.
• openings 13 are provided between the pleats of the outermost filter 4, as shown in the sectional view in fig. 4. This may be done in that the supply of adhesive is blocked, or in that the adhesive is removed subsequently.
• Openings 13 may be present on the entire lower side of the filter element at the frame 9 or just a portion of this, depending on the need for drainage.
• the filter may be manufactured in a manner corresponding to known filters, and, therefore, they are not very expensive to produce, but the capacity is considerably greater owing to the larger filter area, the efficiency is greater owing to the obliquely extending filter elements and thereby the high degree of self-cleaning owing to precipitation, and last, but not least owing to the small pressure loss to which the flow is subjected at the cleaning in the fil- ter.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43617904

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (6)

Citations (4)

Family Cites Families (10)

• 2009
  • 2009-12-11 DK DKPA200901308A patent/DK200901308A/da not_active Application Discontinuation
• 2010
  • 2010-11-12 US US12/945,561 patent/US20110162336A1/en not_active Abandoned
  • 2010-12-09 WO PCT/DK2010/000171 patent/WO2011069508A1/en not_active Ceased

Patent Citations (4)

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