Exhaust emission purifying apparatus for engine
First Claim
1. An exhaust emission purifying apparatus for an engine comprising:
- a first oxidation catalytic converter disposed in an exhaust system of the engine, for reducing nitrogen monoxide in exhaust emission by an oxidation reaction;
a reduction catalytic converter disposed in said exhaust system of the engine, for reductively purifying nitrogen oxides in exhaust emission with a reducing agent;
a second oxidation catalytic converter for ammonia-slip disposed on a latter stage of said reduction catalytic converter in said exhaust system;
an injection nozzle disposed within an exhaust passage of said exhaust system, for injection-supplying the reducing agent to an upstream side of a flow of exhaust emission with respect to the reduction catalytic converter within an exhaust passage of said exhaust system from a downstream side of the flow of exhaust emission with respect to said first oxidation catalytic converter; and
a reducing agent supply device which supplies the reducing agent to the injection nozzle,wherein the exhaust passage is provided, in an inner wall of a lower portion thereof, with a recess portion by concaving a given site to which at least the reducing agent injection-supplied via the injection nozzle is attached, andwherein the recess portion has a bottom wall thereof configured to be detachably assembled.
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Accused Products
Abstract
An exhaust emission purifying apparatus for an engine having: a reduction catalytic converter disposed in an exhaust system of the engine, for reductively purifying nitrogen oxides in the exhaust emission with a reducing agent; an injection nozzle for injection-supplying the reducing agent to an exhaust upstream side of the reduction catalytic converter in an exhaust pipe of the exhaust system; and a reducing agent supply device supplying the reducing agent to the injection nozzle, in which a recess portion is formed on an inner wall on a lower portion of the exhaust pipe, by concaving a site to which at least the reducing agent injection-supplied from the injection nozzle is attached, and also, a bottom wall of the recess portion is made detachable.
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Citations
19 Claims
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1. An exhaust emission purifying apparatus for an engine comprising:
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a first oxidation catalytic converter disposed in an exhaust system of the engine, for reducing nitrogen monoxide in exhaust emission by an oxidation reaction; a reduction catalytic converter disposed in said exhaust system of the engine, for reductively purifying nitrogen oxides in exhaust emission with a reducing agent; a second oxidation catalytic converter for ammonia-slip disposed on a latter stage of said reduction catalytic converter in said exhaust system; an injection nozzle disposed within an exhaust passage of said exhaust system, for injection-supplying the reducing agent to an upstream side of a flow of exhaust emission with respect to the reduction catalytic converter within an exhaust passage of said exhaust system from a downstream side of the flow of exhaust emission with respect to said first oxidation catalytic converter; and a reducing agent supply device which supplies the reducing agent to the injection nozzle, wherein the exhaust passage is provided, in an inner wall of a lower portion thereof, with a recess portion by concaving a given site to which at least the reducing agent injection-supplied via the injection nozzle is attached, and wherein the recess portion has a bottom wall thereof configured to be detachably assembled. - View Dependent Claims (2, 3, 4, 5)
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6. An exhaust emission purifying apparatus for an engine comprising:
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a first oxidation catalytic converter disposed in an exhaust system of the engine, for reducing nitrogen monoxide in exhaust emission by an oxidation reaction; a reduction catalytic converter disposed in said exhaust system of the engine, for reductively purifying nitrogen oxides in exhaust emission with a reducing agent; a second oxidation catalytic converter for ammonia-slip disposed on a latter stage of said reduction catalytic converter in said exhaust system; an injection nozzle disposed within an exhaust passage of said exhaust system, arranged for injection-supplying the reducing agent to an upstream side of the exhaust emission flow with respect to the reduction catalytic converter within an exhaust passage of the exhaust system from a downstream side of the exhaust emission flow with respect to said first oxidation catalytic converter; and a reducing agent supply device arranged for supplying the reducing agent to the injection nozzle, wherein the apparatus further comprises blocking means which is detachably disposed for blocking an exhaust passage portion between a portion of the exhaust passage, to which the reducing agent injection-supplied from said injection nozzle is attached, and another portion of the exhaust passage, on which at least said reduction catalytic converter is disposed, and a feed port for feeding washing water and a drain port for drainage of the washing water are provided on a wall portion of the exhaust passage at the portion to which said reducing agent is attached. - View Dependent Claims (7, 8, 9, 10)
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11. An exhaust emission purifying apparatus for an engine comprising:
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a first oxidation catalytic converter disposed in an exhaust system of the engine, for reducing nitrogen monoxide in exhaust emission by an oxidation reaction; a reduction catalytic converter disposed in said exhaust system of the engine, for reductively purifying nitrogen oxides in exhaust emission with a reducing agent; a second oxidation catalytic converter for ammonia-slip disposed on a latter stage of said reduction catalytic converter in said exhaust system; an injection nozzle disposed within an exhaust passage of said exhaust system, arranged for injection-supplying the reducing agent to an upstream side of the exhaust emission flow with respect to the reduction catalytic converter within an exhaust passage of the exhaust system from a downstream side of the exhaust emission flow with respect to said first oxidation catalytic converter; and a reducing agent supply device arranged for supplying the reducing agent to the injection nozzle, wherein the apparatus is further provided with a detachable structure formed in the exhaust passage at a portion thereof to which the reducing agent injection-supplied from said injection nozzle is attached. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification