Bag house filters and media

• US 20080274312A1
• Filed: 05/02/2007
• Published: 11/06/2008
• Est. Priority Date: 05/02/2007
• Status: Active Grant

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Wyss, Kurt Hans, Simmonds, Glen E., Kohli, Anil, Schelling, Antoine
• Granted Patent: US 8,343,250 B2
• Time in Patent Office: Days
• US Class Current: 428/34.5
• CPC Class Codes: B01D 2239/025 comprising nanofibres apparatus incorporating such gas filtering material see B01D46/546
• CPC Class Codes: B01D 2239/0609 Knitted
• CPC Class Codes: B01D 2239/0613 Woven
• CPC Class Codes: B01D 2239/0618 Non-woven
• CPC Class Codes: B01D 2239/0622 Melt-blown
• CPC Class Codes: B01D 2239/0627 Spun-bonded
• CPC Class Codes: B01D 2239/0631 Electro-spun
• CPC Class Codes: B01D 2239/064 The fibres being mixed
• CPC Class Codes: B01D 2239/0654 Support layers
• CPC Class Codes: B01D 2239/0659 The layers being joined by needling
• CPC Class Codes: B01D 2239/0663 The layers being joined by hydro-entangling
• CPC Class Codes: B01D 2239/0668 The layers being joined by heat or melt-bonding
• CPC Class Codes: B01D 2239/0681 The layers being joined by gluing
• CPC Class Codes: B01D 2239/0695 Wound layers apparatus incorporating such gas filtering material B01D2275/105
• CPC Class Codes: B01D 2239/10 Filtering material manufacturing
• CPC Class Codes: B01D 2239/1233 Fibre diameter
• CPC Class Codes: B01D 39/083 of organic material
• CPC Class Codes: B01D 39/086 of inorganic material
• CPC Class Codes: B01D 39/163 sintered or bonded
• CPC Class Codes: B01D 39/202 sintered or bonded by inorganic agents
• CPC Class Codes: B01D 39/2055 : Carbonaceous material solid sorbent compositions comprising free carbon B01J20/20
• CPC Class Codes: B01D 39/2065 : the material being fibrous
• CPC Class Codes: B01D 46/02 : Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• CPC Class Codes: B32B 5/02 : characterised by structural features of a fibrous or filamentary layer layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02
• CPC Class Codes: Y10T 428/13 : Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/1314 : Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
• CPC Class Codes: Y10T 428/1334 : Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]

Abstract

A bag filter having a support structure clothed in a filter bag. The cloth of the filter bag is a composite of at least one substrate layer and at least one nanoweb bonded thereto in a face-to-face relationship. The nanoweb is positioned at the surface of the filter bag first exposed to the hot particle laden gas stream and can have a basis weight of greater than about 2 gsm.

Claims

1. A bag filter comprising a support structure clothed in a filter bag, the cloth of said filter bag comprising a composite of at least one substrate layer and a first nanoweb layer having a basis weight of greater than about 2 gsm bonded thereto in a face-to-face relationship.

2. The bag filter of claim 1, wherein the nanoweb is positioned on the upstream side of the filter bag.

3. The bag filter of claim 1, wherein the substrate layer and nanoweb layer remain bonded after the filter has been subjected to VDI 3926 for 30 cycles.

4. The bag filter of claim 1, further comprising a second nanoweb layer bonded to the substrate layer on the face opposite to the face bonded to the first nanoweb layer.

5. The bag filter of claim 4, further comprising a second substrate layer bonded to the second nanoweb layer.

6. The bag filter of claim 1, wherein at least one nanoweb layer and at least one substrate layer are bonded by a method selected from the group consisting of thermal bonding, adhesive bonding, needlepunching and hydroentangling.

7. The bag filter of claim 6, wherein the substrate layer and the nanoweb layer are needle punched with about 40 to 100 perforations/cm², and 25% or less of the nanoweb layer is perforated.

8. The bag filter of claim 1, wherein each substrate layer independently comprises fiber selected from polyester fiber, carbon fiber, polyimide fiber, glass fiber, and mixtures thereof.

9. A bag filter comprising a support structure clothed in a filter bag, the cloth of said filter bag comprising a composite of at least one substrate layer bonded to a web in a face to face relationship, the web comprising a nanoweb layer having a basis weight of greater than about 0.1 gsm and a scrim bonded to the nanoweb layer and wherein the web is positioned on the upstream side of the filter bag.

10. The bag filter of claim 9, wherein the scrim is positioned in between the nanoweb and the substrate.

11. The bag filter of claim 9, wherein the nanoweb layer is positioned between the scrim and the substrate.

12. The bag filter of claim 9, wherein the substrate layer and nanoweb layer remain bonded after the filter has been subjected to VDI 3926 for 30 cycles.