Exhaust gas purification device and engine
AssigneeYanmar Holdings Co., Ltd.
InventorsTsuyoshi Inoue, Daisuke Morimitsu, Kohei Iwamoto
Life of this patent
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Abstract
An exhaust gas purification device for purifying exhaust gas of nitrogen oxides includes: a catalyst that is provided in an exhaust pipe (exhaust passage) for transporting exhaust gas, discharged from an engine, in a predetermined exhaust direction, and promotes the reduction of the exhaust gas; and an injection nozzle that is provided in the exhaust pipe so as to be upstream of the catalyst in the exhaust direction, and injects a reducing agent for reducing the exhaust gas. The injection nozzle includes an injection hole for injecting the reducing agent toward the catalyst, and a discharge hole for discharging a cooling medium in at least the direction opposite the exhaust direction.
Claims17
An exhaust gas purification device for purifying nitrogen oxides of exhaust gas, the exhaust gas purification device comprising:
- a catalyst that is provided in an exhaust passage that is configured to allow an exhaust gas discharged from an engine to flow in a predetermined exhaust direction and promote reduction of the exhaust gas;
- and
- an injection nozzle that is provided in the exhaust passage upstream from the catalyst in the predetermined exhaust direction and is configured to inject a reducing agent for reducing the exhaust gas,
- wherein the injection nozzle has:
- an injection hole configured to enable injection of the reducing agent toward the catalyst and at a first point in the exhaust passage, and
- a discharge hole configured to enable discharge of a cooling medium at least in a direction opposite to the predetermined exhaust direction and at a second point in the exhaust passage upstream from the first point in the predetermined exhaust direction.
A method of purifying nitrogen oxides of exhaust gas, the method comprising:
- providing a catalyst in an exhaust passage, wherein the catalyst is configured to promote reduction of an exhaust gas flowing in a predetermined exhaust direction through the exhaust passage;
- injecting, via an injection hole of an injection nozzle, a reducing agent into the exhaust passage toward the catalyst, wherein the reducing agent is injected at a first position in the exhaust passage that is upstream the catalyst in the predetermined exhaust direction;
- injecting, via a discharge hole of the injection nozzle, a cooling medium into the exhaust passage in a direction opposite to the predetermined exhaust direction and at a second position in the exhaust passage that is upstream the first position in the predetermined exhaust direction.
Dependencies are inferred from the claim text.