WO2009007106A1 - Élément de filtration résistant à la chaleur avec revêtement - Google Patents

Élément de filtration résistant à la chaleur avec revêtement Download PDF

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Publication number
WO2009007106A1
WO2009007106A1 PCT/EP2008/005603 EP2008005603W WO2009007106A1 WO 2009007106 A1 WO2009007106 A1 WO 2009007106A1 EP 2008005603 W EP2008005603 W EP 2008005603W WO 2009007106 A1 WO2009007106 A1 WO 2009007106A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
beads
filter element
base body
plastic
Prior art date
Application number
PCT/EP2008/005603
Other languages
German (de)
English (en)
Inventor
Walter Herding
Stefan Hajek
Wolfgang Raabe
Jürgen BETHKE
Original Assignee
Herding Gmbh Filtertechnik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Herding Gmbh Filtertechnik filed Critical Herding Gmbh Filtertechnik
Publication of WO2009007106A1 publication Critical patent/WO2009007106A1/fr

Links

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
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2006—Glass or glassy material the material being particulate
    • B01D39/2013—Glass or glassy material the material being particulate otherwise bonded, e.g. by resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
    • B01D39/2079—Other inorganic materials, e.g. ceramics the material being particulate or granular otherwise bonded, e.g. by resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0457—Specific fire retardant or heat resistant properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating material
    • B01D2239/0478—Surface coating material on a layer of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/08—Special characteristics of binders
    • B01D2239/086—Binders between particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1241—Particle diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/125—Size distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/40—Porous blocks
    • B01D2275/406—Rigid blocks

Definitions

  • the invention relates to a heat-resistant, flow-through self-stable filter element, comprising:
  • thermosetting plastic an intrinsically stable body, which is constructed with hollow glass beads and / or hollow ceramic beads, which are held together by thermosetting plastic;
  • a filter element is also known, in which the base body is constructed with hollow glass beads and / or hollow ceramic beads which are held together by thermosetting plastic (WO 2005/053818 A1). This known filter element can be used at steady-state temperatures that are well above normal ambient temperatures (50 to 200 ° C.).
  • the filter element according to WO 2005/053818 A1 is relatively damage-sensitive if abrasive particles or even coarser, possibly sharp-edged or pointed parts are contained in the raw gas to be filtered.
  • the hollow glass beads or ceramic beads are not able to cope with the local stress caused by - sometimes with considerable speed - flying particles or parts and collapse.
  • This also applies if a coating of the type described in WO 2005/053818 A1 is present on the inflow surface, because the particles or parts either penetrate the coating or exert excessive local impact forces on the crumb body through the coating. Once the body is locally damaged, its destruction progresses with the continued use of the filter element.
  • the invention has for its object to provide a filter element available, which despite the structure with relatively impact-sensitive hollow spheres is not in danger of being damaged by on the upstream side approaching particles or parts and a good combination of impact-unresponsiveness and surface filtration (ie, filtered particles are trapped by the coating and do not penetrate to the body).
  • the filter element according to the invention on the inflow surface of the base body on a coating which is constructed with glass beads, which are held together by thermosetting plastic.
  • this coating on the one hand represents a very effective "armoring" of the outer surface of the main body, whereby a role is played by the fact that the composite of glass beads of the coating and thermosetting plastic has a certain damping effect on impacting particles or Sharing has. Damage by impinging particles or parts, as described above, is no longer observed with the coating according to the invention.
  • the coating according to the invention leads to the filter element working very well on the principle of surface filtration. Filtered particles stick to the outside of the coating and penetrate at most a very short distance into the coating, without penetrating up to the body.
  • the coating can be cleaned very well by the countercurrent jet pulse method.
  • the glass beads of the coating are preferably solid, non-hollow glass beads.
  • the term "beaded" has been chosen to express that the respective beads (and the plastic) need not be the exclusive components of the main body or the coating.
  • the filter element according to the invention in which further constituents are present, for example carbon black particles as antistatic additive or fibers for reinforcement.
  • the beads and the plastic are by far the most important constituents of the main body or of the coating, as a rule more than 95% by weight.
  • the filter element has a continuous use temperature
  • a temperature in the range of 50 to 200 ° C or in the range of 50 to 150 0 C is or is in the range of 80 to 150 0 C, or in the range of 100 to 150 0 C.
  • continuous use temperature which is a temperature in the range of 50 to 200 0 C
  • the filter element is permanently used up to the maximum temperature of 200 ° C this range.
  • there are embodiments of the filter element according to the invention which have a continuous use temperature of, for example, 80 ° C. (but not above it), that is to say that they are located somewhere in the interior of said region.
  • Preferred plastics for the base body and / or the coating are epoxy resin, phenolic resin, polyester resin, melamine resin, silicone resin, urethane resin. Preferably, the same plastic is used for the base body and for the coating, but this is by no means mandatory.
  • Preferred ranges or limits on the size (often simply called “diameter” in the practice) of the beads of the body and the beads of the coating are set forth in claims 5, 6, 7. With the size of the beads of the base body, one strives for a good compromise between good body strength (which is easier for small beads than large ones) and low flow pressure loss (smaller for large beads). Coating strives for a good compromise between good armor effect and good surface filtration action (pointing toward smaller beads) and low pressure drop (pointing towards larger beads). Preferred ranges for the weight ratio between the respective beads and the plastic are given in claim 8. you sees that the weight of the beads is a multiple of the weight of the plastic.
  • the coating is preferably designed so that it completely covers the beads of the base body at the inflow surface. This is a substantially nowhere undercut thickness of at least 0.06 mm, better 0.12 mm low.
  • the preferred upper limit of the thickness of the coating is 0.3 mm, more preferably 0.2 mm.
  • a further subject of the invention is a method for producing a filter element according to the invention, characterized
  • the base body is first brought into the inherently stable state before a coating composition is applied and the coating is brought to the finished state.
  • the application of the coating composition preferably takes place by means of a doctor blade.
  • the generation of heat The action is preferably done in an oven where the heat is normally introduced in a combination of radiant heat and convective heat. Other ways of generating the heat are possible, for example by means of microwave.
  • the above-mentioned production method according to the invention is not the only one with which a filter element according to the invention can be produced.
  • Said heat action is preferably such that the base body or the coating to be produced is heated to more than 100 0 C, preferably more than 120 0 C, more preferably 160 to 180 0 C in the case of epoxy resin.
  • the most practical temperature depends on the plastic used.
  • the liquid mentioned in step (b) is an aqueous liquid.
  • the liquid mentioned in step (b) is an aqueous liquid.
  • Fig. 1 shows a section of a filter element according to the invention in section; the cutout is laid so that a partial region of the inflow surface of the filter element can be seen.
  • FIG. 1 shows that the filter element 2 has a base body 4 and a coating 6 on the inflow surface of the filter element 2 (see inflow arrow 8 for raw gas to be filtered).
  • the base 4 is constructed with hollow ceramic beads or hollow glass beads 10 made of thermosetting plastic, e.g. Epoxy resin, are held together at junctions 12.
  • the beads 10 in this embodiment have an average size of just over 100 ⁇ m.
  • the fact that the beads 10 are hollow is not shown in the drawing. It can be seen that the globules are by no means in the form of an exact geometrical sphere, but nevertheless the word “globules” in the sense of "roughly spherical” most likely describes the shape of the constituents 10.
  • sectional view of the figure somewhat misrepresents that the beads 10 are in fact practically in the form of a dense sphere package.
  • the contact points or connecting points between neighboring beads 10 are often in front of or behind the plane of the drawing.
  • the coating 6 is constructed with solid glass beads 14, which are held together by thermosetting plastic, for example, in turn, the same epoxy resin.
  • the joining points of adjacent glass beads 14 are not particularly marked here as "bonding nodes" because they are much smaller than the joining points 12 in the base body 4.
  • the glass beads 14 in the exemplary embodiment have an average size of about 30 ⁇ m. It is understood that between the corresponding part of the glass beads 14 and subsequent beads 10 of the base body 4 at its upstream side surface also plastic union points are available. It can be seen that the coating 6 completely covers all the beads 10 located on the inflow-side surface of the main body 4 and also extends into the outer pores 16 of the body 4.
  • the main body 4 has been made by itself.
  • the beads 10 were mixed together with granular plastic starting material (epoxy resin cresol base, epoxy resin bisphenol base, hardener, average particle size slightly smaller than in the glass beads 14) and introduced into a mold cavity.
  • the filled mold has been inserted into an oven and the contents of the mold cavity have been heated to about 160 to 180 ° C.
  • the plastic starting material initially melts, more or less completely enveloping the beads 10, and accumulates more strongly at the contact points or quasi-contact points between the beads 10. As the temperature continues to increase and in the course of the residence time in the furnace hardens the plastic out.
  • a paste-like coating which consists of a dry component and a liquid component in a weight ratio of about 3: 2.
  • the dry component consists essentially of the non-hollow glass beads 14 and granular plastic starting material (for example, the same as described above for the main body 4), in the present embodiment in the ratio of about 8: 1.
  • the dry ingredient contains extremely finely divided silica as a thickener.
  • the liquid component consists essentially of water with defoamer additive.
  • the pasty coating composition is applied by means of a doctor blade to the inflow side of the base body 4 in the desired thickness (see FIG. 1). The base body 4 provided with the applied coating composition is then allowed to dry for a short time.
  • the filter elements are made in the shape of a hollow cylinder, which may be open at both ends or only at one end.
  • a plurality of filter elements In a sheet-metal housing, which is divided by an intermediate wall into a raw gas space for filtered exhaust air and a clean gas chamber for filtered air, a plurality of filter elements, typically in several parallel rows, arranged so that the raw gas from the outside of the respective hollow cylinder forth in the inside of the hollow cylinder must flow and thereby filtered.
  • the filter element according to the invention is suitable for gas filtration and for liquid filtration.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un élément de filtration résistant à la chaleur, poreux à la traversée, de forme stable, qui comprend : (a) un corps de base de forme stable (4), qui est constitué de billes de verre creuses et/ou de billes de céramique creuses (10) qui sont assemblées par un plastique thermodurcissable (12) ; (b) et un revêtement (6) ayant des pores de taille plus petite que le corps de base (4) sur la surface d'afflux du corps de base (4), ledit revêtement (6) étant constitué de billes de verre (14) qui sont assemblées par un plastique thermodurcissable.
PCT/EP2008/005603 2007-07-10 2008-07-09 Élément de filtration résistant à la chaleur avec revêtement WO2009007106A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007032060.6A DE102007032060B4 (de) 2007-07-10 2007-07-10 Wärmebeständiges Filterelement mit Beschichtung und Verfahren zu dessen Herstellung
DE102007032060.6 2007-07-10

Publications (1)

Publication Number Publication Date
WO2009007106A1 true WO2009007106A1 (fr) 2009-01-15

Family

ID=39817137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/005603 WO2009007106A1 (fr) 2007-07-10 2008-07-09 Élément de filtration résistant à la chaleur avec revêtement

Country Status (2)

Country Link
DE (1) DE102007032060B4 (fr)
WO (1) WO2009007106A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024048781A1 (fr) * 2022-09-02 2024-03-07 Nittetsu Mining Co., Ltd. Procédé pour former une couche de collecte de poussière sur un corps poreux sans utiliser de liant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019127302A1 (de) * 2019-10-10 2021-04-15 Herding Gmbh Filtertechnik Verfahren zum Herstellen eines beschichteten Filterelements, Auftragsvorrichtung zum Beschichten eines Filterkörpers, sowie beschichtetes Filterelement

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753500A (en) * 1970-03-20 1973-08-21 Minnesota Mining & Mfg Integral in-line filter
US3914358A (en) * 1973-12-10 1975-10-21 Westinghouse Electric Corp Method of improving the finish of the bores of a reverse osmosis sand module
EP0320033A1 (fr) * 1987-11-19 1989-06-14 Hoogovens Groep B.V. Membrane composite céramique microperméable, procédé et appareil pour sa fabrication
DE4211529A1 (de) * 1992-04-06 1993-10-07 Herding Entstaubung Filterelement mit einem formstabilen, durchlässig-porösen Kunststoff-Formkörper
EP0785014A1 (fr) * 1996-01-16 1997-07-23 Morton International, Inc. Filtres en céramique rencorcés pour air-bag
US5993502A (en) * 1996-07-15 1999-11-30 Kubota Corporation Sintered metal filters
US20030054149A1 (en) * 2001-09-20 2003-03-20 Pan Alfred I-Tsung Porously coated open-structure substrate and method of manufacture thereof
WO2005053818A1 (fr) * 2003-12-08 2005-06-16 Herding Gmbh Filtertechnik Element filtrant resistant a la chaleur et/ou aux produits chimiques

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3764397A (en) 1996-08-16 1998-03-06 Marcel Huder Solid filter of epoxy-bonded granules

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753500A (en) * 1970-03-20 1973-08-21 Minnesota Mining & Mfg Integral in-line filter
US3914358A (en) * 1973-12-10 1975-10-21 Westinghouse Electric Corp Method of improving the finish of the bores of a reverse osmosis sand module
EP0320033A1 (fr) * 1987-11-19 1989-06-14 Hoogovens Groep B.V. Membrane composite céramique microperméable, procédé et appareil pour sa fabrication
DE4211529A1 (de) * 1992-04-06 1993-10-07 Herding Entstaubung Filterelement mit einem formstabilen, durchlässig-porösen Kunststoff-Formkörper
EP0785014A1 (fr) * 1996-01-16 1997-07-23 Morton International, Inc. Filtres en céramique rencorcés pour air-bag
US5993502A (en) * 1996-07-15 1999-11-30 Kubota Corporation Sintered metal filters
US20030054149A1 (en) * 2001-09-20 2003-03-20 Pan Alfred I-Tsung Porously coated open-structure substrate and method of manufacture thereof
WO2005053818A1 (fr) * 2003-12-08 2005-06-16 Herding Gmbh Filtertechnik Element filtrant resistant a la chaleur et/ou aux produits chimiques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024048781A1 (fr) * 2022-09-02 2024-03-07 Nittetsu Mining Co., Ltd. Procédé pour former une couche de collecte de poussière sur un corps poreux sans utiliser de liant

Also Published As

Publication number Publication date
DE102007032060A1 (de) 2009-01-15
DE102007032060B4 (de) 2019-05-23

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