# US 2009/0013674 A1 · Exhaust Gas Purifier

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2009/0013674 A1
- Document ID: US20090013674A1
- Status: Published application
- Kind: A1
- Application number: 11/909,759
- Filed: 2006-03-14
- Published: 2009-01-15
- Earliest claimed: 2005-03-29
- Assignees: Yanmar Co., Ltd.
- Inventors: Taisuke Ono
- Web page: https://patentgrep.com/patent/US20090013674A1

## CPC

- F01N 3/032: during filter regeneration only
- B01D 53/9431: {Processes characterised by a specific device}
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- F01N 3/0814: {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts}
- F01N 3/0821: {combined with particulate filter}
- F01N 3/0842: {Nitrogen oxides}
- F01N 3/2033: {using a fuel burner or introducing fuel into exhaust duct}
- F01N 3/30: Arrangements for supply of additional air (control, e.g. using by-passes or variable air pump drives, F01N3/22)
- F01N 3/38: Arrangements for igniting
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- F01N 13/0093: {the purifying devices are of the same type}
- F01N 13/0097: {the purifying devices are arranged in a single housing}
- F01N 13/011: {having two or more purifying devices arranged in parallel}
- F01N 3/0885: {Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps}
- F01N 2240/30: a fuel reformer
- F01N 2390/00: Arrangements for controlling or regulating exhaust apparatus
- F01N 2410/00: By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F01N 2410/12: in case of absorption, adsorption or desorption of exhaust gas constituents
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present invention provides an exhaust gas purifier capable of appropriately purifying harmful components discharged even from an internal combustion engine or a combustion instrument operated mainly in excess-air conditions. Particularly, the exhaust gas purifier is capable of appropriately removing nitrogen oxides, particulate matters including soot, etc. and in addition, capable of maintaining its purification capability without reduction. the exhaust gas purifier has, in the exhaust passage (2) of an internal combustion engine (1), a nitrogen oxide adsorbent (4) for temporarily adsorbing nitrogen oxides and desorbing the adsorbed nitrogen oxides in a temperature-increased environment or a reducing environment, an adsorbed substance desorbing means (3) being disposed on an exhaust gas upstream side of the nitrogen oxide adsorbent (4), the adsorbed substance desorbing means (3) heating the exhaust gas or air or converting the exhaust gas or air into a reducing atmosphere, a combustion apparatus (5) being disposed on an exhaust gas downstream side of the nitrogen oxide adsorbent (4), the combustion apparatus (4) including air supply means (15), fuel supply means (6), and ignition means (7); and a filter apparatus (40) being disposed on an exhaust gas downstream side of the combustion apparatus (5) to be able to capture a particulate substance contained in the exhaust gas.

## Claims

### Claim 1

An exhaust gas purifier being displaced in an exhaust passage of an internal combustion engine or a combustion instrument, in the exhaust passage, the exhaust gas purifier comprising:
a nitrogen oxide adsorbent temporarily adsorbing nitrogen oxide and desorbing the adsorbed nitrogen oxide by heating or reducing atmosphere;
adsorbed substance desorbing means being disposed on an exhaust gas upstream side of the nitrogen oxide adsorbent, the adsorbed substance desorbing means heating the exhaust gas or air or converting the exhaust gas or air into a reducing atmosphere;
a combustion apparatus being disposed on an exhaust gas downstream side of the nitrogen oxide adsorbent, the combustion apparatus including air supply means, fuel supply means, and ignition means; and
a filter apparatus being disposed on an exhaust gas downstream side of the combustion apparatus to be able to capture a particulate substance contained in the exhaust gas.

### Claim 2 (depends on 1)

The exhaust gas purifier according to claim 1, characterized in that the exhaust passage is branched into a plurality of branch exhaust passages,
blocking means for being able to block gas flow is provided in an exhaust gas inlet of each branch exhaust passage,
each branch exhaust passage includes the nitrogen oxide adsorbent, the adsorbed substance desorbing means, the combustion apparatus and the filter apparatus, and
the adsorbed substance desorbing means includes air supply means and the adsorbed substance desorbing means is configured to heat air from the air supply means or to convert the air into the reducing atmosphere.

### Claim 3

An exhaust gas purifier being displaced in an exhaust passage of an internal combustion engine or a combustion instrument, the exhaust gas purifier characterized in that the exhaust passage branch exhaust passage is branched into a plurality of branch exhaust passages,
blocking means for being able to block gas flow are provided at an exhaust gas inlet and an exhaust gas outlet of the branch exhaust passage,
a nitrogen oxide adsorbent, a adsorbed substance desorbing means, a combustion apparatus, a filter apparatus, and an atmospheric air releasing portion are provided between the blocking means at the exhaust gas inlet and exhaust gas outlet of the branch exhaust passage,
the nitrogen oxide adsorbent temporarily adsorbing nitrogen oxide and desorbing the adsorbed nitrogen oxide by heating or reducing atmosphere,
the adsorbed substance desorbing means being disposed on an exhaust gas downstream side of the nitrogen oxide adsorbent, the adsorbed substance desorbing means including air supply means, the adsorbed substance desorbing means heating air from the air supply means or converting the air into a reducing atmosphere,
the combustion apparatus being disposed on an exhaust gas upstream side of the nitrogen oxide adsorbent, the combustion apparatus including air supply means, fuel supply means, and ignition means,
the filter apparatus being disposed on an exhaust gas upstream side of the combustion apparatus to be able to capture a particulate substance contained in the exhaust gas,
the atmospheric air releasing portion being disposed on an exhaust gas upstream side of the filter apparatus to open the branch exhaust passage to an atmosphere, and
when the adsorbed substance desorbing means and the combustion apparatus are operated to perform a regenerating operation, the exhaust gas inlet and exhaust gas outlet of the branch exhaust passage are blocked by the blocking means, the branch exhaust passage is opened by the atmospheric air releasing portion, and gas generated by the regenerating operation is caused to flow in a direction opposite an exhaust gas flowing direction and discharged from the atmospheric air releasing portion.

### Claim 4

An exhaust gas purifier being displaced in an exhaust passage of an internal combustion engine or a combustion instrument, the exhaust gas purifier characterized in that the exhaust passage branch exhaust passage is branched into a plurality of branch exhaust passages,
blocking means for being able to block gas flow are provided at an exhaust gas inlet and an exhaust gas outlet of the branch exhaust passage,
a nitrogen oxide adsorbent, a sulfur oxide adsorbent, an adsorbed substance desorbing means, a combustion apparatus, a filter apparatus, and an atmospheric air releasing portion are provided between the blocking means at the exhaust gas inlet and exhaust gas outlet of the branch exhaust passage,
the nitrogen oxide adsorbent temporarily adsorbing nitrogen oxide and desorbing the adsorbed nitrogen oxide by heating or reducing atmosphere,
the sulfur oxide adsorbent being disposed on an exhaust gas upstream side of the nitrogen oxide adsorbent, the sulfur oxide adsorbent temporarily adsorbing sulfur oxide and desorbing the adsorbed sulfur oxide by heating or reducing atmosphere,
the adsorbed substance desorbing means being disposed on an exhaust gas downstream side of the nitrogen oxide adsorbent, the adsorbed substance desorbing means including air supply means, the adsorbed substance desorbing means heating air from the air supply means or converting the air into a reducing atmosphere,
the combustion apparatus being disposed on an exhaust gas upstream side of the nitrogen oxide adsorbent, the combustion apparatus including air supply means, fuel supply means, and ignition means,
the atmospheric air releasing portion being disposed on an exhaust gas upstream side of the combustion apparatus to open the branch exhaust passage to an atmosphere, and
when the adsorbed substance desorbing means and the combustion apparatus are operated to perform a regenerating operation, the exhaust gas inlet and exhaust gas outlet of the branch exhaust passage are blocked by the blocking means, the branch exhaust passage is opened by the atmospheric air releasing portion, and gas generated by the regenerating operation is caused to flow in a direction opposite an exhaust gas flowing direction and discharged from the atmospheric air releasing portion.

### Claim 5 (depends on 4)

The exhaust gas purifier according to claim 4, characterized in that, in each branch exhaust passage, a filter apparatus which can capture a particulate substance contained in the exhaust gas is disposed on the exhaust gas upstream side of the combustion apparatus and on the exhaust gas downstream side of the atmospheric air releasing portion.