# US 11,441,465 B2 · Exhaust gas purification device and ship including exhaust gas purification device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,465 B2 - Document ID: US11441465B2 - Status: Granted - Kind: B2 - Application number: 17/269,382 - Filed: 2019-08-29 - Published: 2021-06-10 - Granted: 2022-09-13 - Earliest claimed: 2018-09-14 - Assignees: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. - Applicants: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. - Inventors: Takehiko Kakizakai; Toshihiro Fujii; Hitoshi Ito; Akira Otaki; Tomohide Hashiguchi; Shintaro Ide - Web page: https://patentgrep.com/patent/US11441465B2 ## CPC - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/035: with catalytic reactors - F01N 13/00: Exhaust or silencing apparatus characterised by constructional features - F01N 13/004: {specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water (for submerged exhausting F01N13/12; treating exhaust by using liquids F01N3/04)} - B63H 21/32: Arrangements of propulsion power-unit exhaust uptakes; Funnels peculiar to vessels - B63H 23/02: with mechanical gearing - F01N 3/28: Construction of catalytic reactors - F01N 13/001: {Exhaust gas flow channels or chambers being at least partly formed in the structural parts of the engine or machine (using structural parts of the vehicle B60K13/06)} - F01N 2340/02: Distance of the exhaust apparatus to the engine or between two exhaust apparatuses - F01N 2340/04: Arrangement of the exhaust system relative to a vehicle or parts thereof - F01N 2470/20: Dimensional characteristics of tubes, e.g. length, diameter - F01N 2560/026: for measuring or detecting NOx - F01N 2590/02: for marine vessels or naval applications - F01N 2610/02: the substance being ammonia or urea - F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus - 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) - B63H: MARINE PROPULSION OR STEERING (propulsion of air-cushion vehicles B60V1/14; specially adapted for submarines, other than nuclear propulsion, B63G; specially adapted for torpedoes F42B19/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust gas purification device is disposed in an exhaust passage of an engine disposed in an engine room defined in a hull, and is configured to remove at least a nitrogen oxide from an exhaust gas discharged from the engine. The exhaust gas purification device includes: a catalytic part including a selective reducing catalyst for selectively reducing the nitrogen oxide; a reducing agent addition device configured to add a reducing agent to the exhaust gas on an upstream side of the catalytic part in a flow direction of the exhaust gas; and a casing configured to contain the catalytic part. At least a part of the casing is disposed inside the engine room. ## Claims ### Claim 1 An exhaust gas purification device disposed in an exhaust passage of an engine disposed in an engine room defined in a hull, the exhaust gas purification device being configured to remove at least a nitrogen oxide from an exhaust gas discharged from the engine, the exhaust gas purification device comprising: a catalytic part including a selective reducing catalyst for selectively reducing the nitrogen oxide; a reducing agent addition device configured to add a reducing agent to the exhaust gas on an upstream side of the catalytic part in a flow direction of the exhaust gas; and a casing configured to contain the catalytic part, wherein at least a part of the casing is disposed inside the engine room, and wherein the exhaust gas purification device further comprises an exhaust gas pipe connecting an exhaust port of the engine and an intake port of the casing, the exhaust gas pipe satisfying L/D<10, where L is a length of the exhaust gas pipe from the exhaust port of the engine to the intake port of the casing, and D is an inner diameter of the exhaust gas pipe. ### Claim 2 (depends on 1) The exhaust gas purification device according to claim 1, wherein the casing has a longitudinal direction, and the casing is arranged above the engine such that the longitudinal direction is along a vertical direction. ### Claim 3 (depends on 2) The exhaust gas purification device according to claim 2, wherein a part of the casing is disposed inside the engine room, and another part of the casing is disposed outside the engine room. ### Claim 4 (depends on 2) The exhaust gas purification device according to claim 2, wherein the casing is disposed below a stack for discharging the exhaust gas from the exhaust passage to outside. ### Claim 5 (depends on 1) The exhaust gas purification device according to claim 1, wherein the reducing agent addition device includes an injection nozzle attached to the casing and having a nozzle hole inserted in the casing, the injection nozzle being configured to inject the reducing agent into the casing. ### Claim 6 (depends on 5) The exhaust gas purification device according to claim 5, wherein the injection nozzle is configured to jet the reducing agent along a direction intersecting a flow direction of the exhaust gas. ### Claim 7 (depends on 1) A ship, comprising: a hull; an engine disposed in an engine room defined in the hull; an exhaust passage of the engine; and the exhaust gas purification device according to claim 1. ### Claim 8 An exhaust gas purification device disposed in an exhaust passage of an engine disposed in an engine room defined in a hull, the exhaust gas purification device being configured to remove at least a nitrogen oxide from an exhaust gas discharged from the engine, the exhaust gas purification device comprising: a catalytic part including a selective reducing catalyst for selectively reducing the nitrogen oxide; a reducing agent addition device configured to add a reducing agent to the exhaust gas on an upstream side of the catalytic part in a flow direction of the exhaust gas; and a casing configured to contain the catalytic part, wherein at least a part of the casing is disposed inside the engine room, wherein the casing is disposed above a marine gear disposed in the engine room, the marine gear being configured to change a rotational speed of a crank shaft of the engine and transmit the rotational speed to a propeller shaft, and wherein L2