US 4,519,820 A · Fitter apparatus for purifying exhaust gases

Abstract

Filter apparatus having a honeycomb structure and a heater for purifying exhaust gases consists of cells or passages defined by porous partition walls. Alternate passages are provided respectively with upstream plugs and downstream plugs. Particulates in exhaust gases are trapped in the honeycomb structure and ignited by the heater. The upstream plugs define spaces upstream thereof in which particulates are trapped in addition to those trapped in the passages having downstream plugs. The heat of burning of the particulates trapped in the spaces facilitates the burning of the particulates trapped in the passages having downstream plugs. Therefore, the exhaust gas particulates trapped and collected in the downstream portion of the structure can also be easily burned to regenerate the structure over its entire length.

Claims15

Dependent claims

Filter apparatus for purifying exhaust gases comprising:

a honeycomb structure having permeable partition walls forming generally parallel inlet and outlet passages for the gases, particulates in the gases being trapped on some of the surfaces of said inlet passages;
upstream packing plugs located in upstream portions of said outlet passages so as to close said passages, at least some of said upstream plugs being spaced downstream from the upstream end surface of said structure so as to define spaces between said upstream end surface of said structure and said upstream plugs for trapping and collecting exhaust gas particulates on at least some of the surfaces of said spaces;
downstream packing plugs located in the downstream ends of said inlet passages so as to close said inlet passages;
and
at least one heater located at the upstream end of said honeycomb structure to heat and ignite the particulates trapped and collected in the upstream portions of said structure including the particulates trapped on said spaced surfaces.

2 more elements

Dependencies are inferred from the claim text.

Fitter apparatus for purifying exhaust gases

Life of this patent

Fitter apparatus for purifying exhaust gases

Life of this patent

Abstract

Claims15