US 10,865,677 B2Granted

Exhaust gas purification device

AssigneeYanmar Power Technology Co., Ltd.

InventorsYoshinori Fukui, Arata Hayata, Yoshihiro Yamaguchi, Tsuyoshi Inoue

Life of this patent

Estimating the term…

Loading patent…

Abstract

An embodiment of an exhaust gas purification device has a function of removing soot adhered to an NOx catalyst arranged inside a cylindrical casing part by injecting pressurized air. The device includes a plurality of air injection nozzles arranged on a side wall of the casing part on an upstream side of the NOx catalyst, which are each configured to generate an impulse wave by injecting pressurized air into the casing part, wherein the air injection nozzles successively inject one by one an equal flow quantity of pressurized air, for a period, at predetermined time intervals.

Claims19

Dependent claims

An exhaust gas purification device having a function of removing soot adhered to a plurality of catalysts arranged inside a casing by injecting pressurized air, comprising:

a plurality of air injection nozzles arranged on a side wall of the casing, each air injection nozzle configured to generate an impulse wave within the casing by injecting the pressurized air into the casing, the plurality of air injection nozzles are positioned upstream of the plurality of catalysts with respect to a direction of a flow of exhaust gas through the casing, wherein:
the plurality of air injection nozzles successively inject one by one the pressurized air, for a duration of t1, into the casing, with predetermined time intervals of a duration t2 between the successive injections;
the duration of t1 is between 0.1 seconds and 0.5 seconds and the duration of t2 is between 30 seconds and 5 minutes;
and
the impulse wave applies a force on the plurality of catalysts which causes pressure fluctuations and causes the soot adhered to the plurality of catalysts to be removed.

2 more elements

An exhaust system comprising:

an exhaust gas purification device comprising:
a casing;
a plurality of catalysts arranged inside the casing;
and
a plurality of air injection nozzles arranged on a side wall of the casing, each air injection nozzle configured to generate an impulse wave within the casing by injecting pressurized air into the casing, the plurality of air injection nozzles are positioned upstream of the plurality of catalysts with respect to a direction of a flow of exhaust gas through the casing,
wherein the impulse wave is configured to remove soot adhered to the plurality of catalysts upon impingement of the impulse wave on the plurality of catalysts;
an air supply passage configured to provide the pressurized air to one or more each of the plurality of air injection nozzles;
and
a controller configured to cause the plurality of air injection nozzles to successively inject one by one the pressurized air for an air injection duration into the casing with predetermined time intervals between the successive injections.

6 more elements

A method of operating an exhaust gas purification device, the method comprising:

injecting, by a first air injection nozzle of a plurality of air injection nozzles arranged on a side wall of a casing of the exhaust gas purification device and upstream of a plurality of catalysts of the exhaust gas purification device, first pressurized air into the casing for a first duration between 0.1 seconds and 0.5 seconds to generate a first impulse wave within the casing, the first impulse wave configured to remove soot adhered to the plurality of catalysts upon impingement of the first impulse wave on the plurality of catalysts;
and
after a time interval between 30 seconds and 5 minutes, injecting, by a second air injection nozzle of the plurality of air injection nozzles, second pressurized air into the casing for a second duration between 0.1 seconds and 0.5 seconds to generate a second impulse wave within the casing, the second impulse wave configured to remove soot adhered to the plurality of catalysts upon impingement of the second impulse wave on the plurality of catalysts.

Dependencies are inferred from the claim text.

Facts

Application: 15/559,034Filed 14 Mar 2016
Priority: JP 2015-05448118 Mar 2015
Published: US 2018/0080356 A122 Mar 2018
Granted: 15 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F01N 3/05
For cooling, or for removing solid constituents of, exhaust: by means of air, e.g. by mixing exhaust with air
B01D 53/94
Of engine exhaust gases: by catalytic processes
F01N 3/023
By means of filters: using means for regenerating the filters, e.g. by burning trapped particles
F01N 3/08
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust: for rendering innocuous

Family

US 2018/0080356 A1Pre-grant publication · published 22 Mar 2018
US 10,865,677 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key