EP0308972A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus and method for treating an exhaust gas from a diesel engine
Assignee: AGC Inc
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Filing: 1988-09-23
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Granted: —
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Expires: 2008-09-23
Abstract
Abstract In an apparatus for treating an exhaust gas from a diesel engine, including a filter unit (10) in an exhaust gas passage for the diesel engine, the filter unit having a honeycomb structure wherein a plurality of cells (12, 13) are divided by cell walls (11) having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; the improvement comprises: back washing gas flow generating means (40) for generating a gas flow at appropriate intervals so as to pass through the cell walls (11) in the direction opposite to the flow of the exhaust gas flow, and a recollecting unit (41) for particulates, which is provided in the exhaust gas passage at a position upstream to the filter unit (10).
Inventors
- 👤 Yoshimasa Arai
- 👤 Satoshi Enamito
- 👤 Noriyuki Oda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 13:49
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0233; F01N3/022; F01N3/0222; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
In an apparatus for treating an exhaust gas from a diesel engine, including a filter unit in an exhaust gas passage for the diesel engine, the filter unit having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; the improvement comprising: back washing gas flow generating means for generating a gas flow at appropriate intervals so as to pass through the cell walls in the direction opposite to the flow of the exhaust gas flow, and a recollecting unit for particulates, which is provided in the exhaust gas passage at a position upstream to the filter unit.
Claim 2
Dependent Claim
131 words
In an apparatus for treating an exhaust gas from a diesel engine, including a filter unit in an exhaust gas passage for the diesel engine, the filter unit having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; the improvement comprising: back washing gas flow generating means for generating a gas flow at appropriate intervals so as to pass through the cell walls in the direction opposite to the flow of the exhaust gas flow, and a recollecting unit for particulates, which is provided in the exhaust gas passage at a position upstream to the filter unit.
Claim 3
Dependent Claim
21 words
An apparatus according to Claim 1, wherein the recollecting unit is provided in the vicinity of and/or below the filter unit.
Claim 4
Dependent Claim
39 words
An apparatus according to Claim 1 or 2, the cross-sectional area of the exhaust gas passage at the recollecting unit is greater than the cross-sectional area of the exhaust gas passage at a position upstream to the recollecting unit.
Claim 5
Independent Claim
21 words
An apparatus acocrding to any one of Claims 1 to 3, wherein the recollecting unit is provided with a filter plate.
Claim 6
Independent Claim
24 words
An apparatus according to any one of Claims 1 to 4, wherein the recollecting unit is provided with a burning means for the particulates.
Claim 7
Independent Claim
43 words
An apparatus according to any one of Claims 1 to 5, wherein the back washing gas flow generating means comprises a nozzle for ejecting a pressurized gas, which is provided in the exhaust gas passage at a position downstream to the filter unit.
Claim 8
Dependent Claim
136 words
In a method for treating an exhaust gas from a diesel engine, comprising; using a filter unit having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; and passing the exhaust gas from one surface to the other surface of the cell walls; the improvement comprising; forcing a back washing gas flow to pass through the cell walls in the direction opposite to the flow of the exhaust gas at appropriate intervals, and trapping particulates in the exhaust gas in a recollecting unit for the particulates, which is provided in an exhaust gas passage at a position upstream to the filter unit.
Claim 9
Dependent Claim
136 words
In a method for treating an exhaust gas from a diesel engine, comprising; using a filter unit having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; and passing the exhaust gas from one surface to the other surface of the cell walls; the improvement comprising; forcing a back washing gas flow to pass through the cell walls in the direction opposite to the flow of the exhaust gas at appropriate intervals, and trapping particulates in the exhaust gas in a recollecting unit for the particulates, which is provided in an exhaust gas passage at a position upstream to the filter unit.
Claim 10
Dependent Claim
79 words
A method according to Claim 7, wherein each time the exhaust gas is continuously passed from one surface to the other surface of the cell walls for a time not shorter than 30 seconds and not longer than 30 minutes, the back washing gas flow is forced to be passed through the cell walls in the direction opposite to the flow of the exhaust gas for a time not shorter than 0.01 seconds and not longer than 5 seconds.
Claim 11
Independent Claim
52 words
A method according to Claims 7 or 8, wherein the difference between the gas-permeation pressure loss in the cell walls just after the back washing gas flow has passed, and the gas-permeation pressure loss in the cell walls just before the back washing gas flow starts passing is 250 mmH₂O or below.
Claim 12
Independent Claim
207 words
A method for treating an exhaust gas from a diesel engine, which comprises; using a plurality of filter units having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; and passing the exhaust gas from one surface to the other surface of the cell walls; the improvement comprising: forcing a back washing gas flow to pass through the cell walls in the direction opposite to the flow of the exhaust gas in at least one of the filter units at appropriate intervals; keeping the exhaust gas to pass from one surface to the other surface of the cell walls in at least one of the remaining filter units during when the back washing gas flow is being forced to pass through the cell walls in the direction opposite to the flow of the exhaust gas in at least one of the filter units; and trapping particulates in the exhaust gas in a recollecting unit for the particulates, which is provided in an exhaust gas passage at a position upstream to the filter unit.
Claim 13
Independent Claim
207 words
A method for treating an exhaust gas from a diesel engine, which comprises; using a plurality of filter units having a honeycomb structure wherein a plurality of cells are divided by cell walls having a filtration function and extend in the same direction as one another, predetermined cells being closed at one end, and the remaining cells being closed at the other end; and passing the exhaust gas from one surface to the other surface of the cell walls; the improvement comprising: forcing a back washing gas flow to pass through the cell walls in the direction opposite to the flow of the exhaust gas in at least one of the filter units at appropriate intervals; keeping the exhaust gas to pass from one surface to the other surface of the cell walls in at least one of the remaining filter units during when the back washing gas flow is being forced to pass through the cell walls in the direction opposite to the flow of the exhaust gas in at least one of the filter units; and trapping particulates in the exhaust gas in a recollecting unit for the particulates, which is provided in an exhaust gas passage at a position upstream to the filter unit.
References Cited (Backward Citations)
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