Filter for treatment of carbon-based particles in exhaust gas and a device for said treatment using said filter

• US 5,800,790 A
• Filed: 09/24/1996
• Issued: 09/01/1998
• Est. Priority Date: 09/25/1995
• Status: Expired due to Fees

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.), Sintokogio Limited
• Original Assignee: Sintokogio Limited
• Inventors: Aizawa, Yukio, Kato, Tatsuhiko, Asami, Toshio, Sekido, Yasuo, Ushiroebisu, Kouichi, Jindo, Katsumi, Komiyama, Tomonari, Goto, Akira, Imamura, Masato, Nakajima, Kiichi
• Primary Examiner(s): Cain, Edward J.
• Application Number:
  US08/718,997
• Time in Patent Office: 707 Days
• Field of Search: 422/174, 422/175, 422/178
• US Class Current: 422/174
• CPC Class Codes: B01D 2279/30 for treatment of exhaust gases from IC Engines
• CPC Class Codes: B01D 39/2044 sintered or bonded by inorganic agents
• CPC Class Codes: B01D 46/0001 Making filtering elements
• CPC Class Codes: B01D 46/10 Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
• CPC Class Codes: B01D 46/2411 Filter cartridges
• CPC Class Codes: B01D 46/521 using folded, pleated material
• CPC Class Codes: B01D 46/84 by heating only
• CPC Class Codes: B01D 53/9454 characterised by a specific device
• CPC Class Codes: F01N 2330/10 Fibrous material, e.g. mineral or metallic wool
• CPC Class Codes: F01N 2330/12 Metallic wire mesh fabric or knitting
• CPC Class Codes: F01N 2330/14 Sintered material
• CPC Class Codes: F01N 2510/065 for reducing soot ignition temperature
• CPC Class Codes: F01N 3/0226 the structure being fibrous
• CPC Class Codes: F01N 3/027 using electric or magnetic heating means
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A filter is provided for treating carbon-based particles in exhaust gas discharged from a diesel internal combustion engine, etc., said filter providing in addition to a high throughput capacity, excellent durability, and good economic and maintenance properties, and a device for treating carbon-based particles in exhaust gas having a high throughput capacity, the regeneration of which is easy. This filter is obtained by cutting an end face of a coiled material that is obtained by winding a sheet of a high-temperature resistant stainless steel having resistance heat-generating properties to produce fibers, gathering the thus-produced fibers to form a web, sintering the web, heat-treating the sintered web to form an alumina film on the surface of the sintered fibers, and optionally supporting a catalyst on the alumina film. In the device electrodes are fixed to the free ends of the filter and, when necessary, an electric current is applied from an electric current-supplying device to the electrodes to cause the filter to generate heat.

Claims

1. A filter for treating carbon-based particles in exhaust gas characterized by consisting of

a sintered body of high-temperature resistant stainless steel fibers produced by cutting an end face of a coiled material that is obtained by winding a sheet of a high-temperature resistant stainless steel having resistance heat-generating properties to produce fibers, gathering the fibers to form a web, sintering the web, and heat-treating the sintered web to form an alumina film on the sintered fibers.

2. A device for treating carbon-based particles in exhaust gas characterized by providing one or more treatment units for carbon-based particles, which treatment unit is provided with

a housing of a device having an introduction part and a discharge part,

a filter for treating carbon-based particles in exhaust gas consisting of

a sintered body of high-temperature resistant stainless steel fibers produced by cutting an end face of a coiled material that is obtained by winding a sheet of a high-temperature resistant stainless steel having resistance heat-generating properties to produce fibers, gathering the fibers to form a web, sintering the web, and heat-treating the sintered web to form an alumina film on the sintered fibers and

electrodes fixed to the free ends of the sintered body, and

a device for applying an electric current to the electrodes when necessary to cause the filter to generate heat.

3. A filter for treating carbon-based particles in exhaust gas characterized by consisting of

a sintered body of high-temperature resistant stainless steel fibers produced by cutting an end face of a coiled material that is obtained by winding a sheet of a high-temperature resistant stainless steel having resistance heat-generating properties, gathering the produced fibers, to form a web, sintering the web, heat-treating the sintered web to form an alumina film on the sintered fibers, and causing a catalyst to be supported on the alumina film.

4. A device for treating carbon-based particles in exhaust gas characterized by providing one or more treatment units for carbon-based particles, each of which treatment units is provided with

a housing of a device having an introduction part and a discharge part,

a filter for treating carbon-based particles in an exhaust gas consisting of

a sintered body of high-temperature-resistant stainless steel fibers consisting of

sintered fibers produced by cutting an end face of a coiled material that is obtained by winding a sheet of a high-temperature resistant stainless steel having resistance heat-generating properties, gathering the produced fibers to form a web, sintering the web, and heat-treating the sintered web to form an alumina film on the surface of the sintered fibers, and causing a catalyst to be supported on the alumina film and

electrodes fixed to the free ends of the sintered body, and

a device for applying an electric current to the electrodes when necessary to cause the filter to generate heat.