CN107143418A - A kind of low-speed diesel engine SCR system and its control method suitable for high-sulfur fuel oil - Google Patents

A kind of low-speed diesel engine SCR system and its control method suitable for high-sulfur fuel oil Download PDF

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Publication number
CN107143418A
CN107143418A CN201710332165.2A CN201710332165A CN107143418A CN 107143418 A CN107143418 A CN 107143418A CN 201710332165 A CN201710332165 A CN 201710332165A CN 107143418 A CN107143418 A CN 107143418A
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Prior art keywords
valve group
bypass pipe
diesel engine
turbocharger
pipe
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CN201710332165.2A
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Chinese (zh)
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CN107143418B (en
Inventor
朱元清
袁鹭
周松
冯永明
胡祖康
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Harbin Engineering University
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Harbin Engineering University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/16—Control of the pumps by bypassing charging air
    • F02B37/162—Control of the pumps by bypassing charging air by bypassing, e.g. partially, intake air from pump inlet to pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

It is an object of the invention to provide a kind of low-speed diesel engine SCR system and its control method suitable for high-sulfur fuel oil, fumer and inlet box are respectively communicated with Diesel Engine Exhaust Pipe and air inlet pipe, the first outlet of fumer connects the first entrance of evaporation mixer by evaporating communicating pipe, the second outlet connection scavenging bypass pipe of fumer, inlet box is respectively communicated with scavenging bypass pipe and the compressor of turbocharger, the second entrance connection reducing agent tank of evaporation mixer, the outlet SCR reactors of evaporation mixer, SCR reactors connect scavenging bypass pipe by reactor bypass pipe, scavenging bypass pipe pays exhaust gas bypass pipe and gas inlet casing respectively, gas inlet casing connects the turbine inlet of turbocharger, exhaust gas bypass pipe connects the turbine outlet of turbocharger, the turbine outlet connection air of turbocharger.The present invention can effectively improve engine exhaust gas temperature, and alleviate SCR catalyst gas passage obstructing problem.

Description

A kind of low-speed diesel engine SCR system and its control method suitable for high-sulfur fuel oil
Technical field
The present invention relates to a kind of diesel exhaust pollutant after-treatment system, specifically boat diesel engine waste gas Pollutant after-treatment system.
Background technology
Influence with marine exhaust pollutant to atmospheric environment is increasingly serious, for marine exhaust emission reduction work more It is valued by people.And nitrogen oxides is the major pollutants of marine exhaust, IMO marine environmental protections committee of International Maritime Organization Member's meeting MPEC exists《MARPOL MARPOL》Require that ship is navigated by water in emission control area in supplemental provisions VI When, its nitrogen oxide emission need to reach the standards of Tier III, i.e. NOx weightings discharge capacity is not higher than 3.4g/kWh, and the Hes of Tier I Tier II is respectively 17g/kWh and 14.4g/kWh.
Due to Tier III for NOx emission propose discharge-reducing method in more strict requirements, machine can not meet will Ask.SCR (Selective Catalytic Reduction, SCR) is a kind of engine exhaust post processing skill Art, can effectively remove the NOx in waste gas, content in waste gas is reached the standards of Tier III.
The general principle of SCR system is to carry out the NOx in engine exhaust using NH3 as reducing agent at a certain temperature Catalytic reduction reaction, by toxic, NOx conversion that is having pollution is nontoxic pollution-free nitrogen and vapor.Because NH3 is difficult storage Deposit and transport, and with certain toxicity, therefore typically stored in the form of aqueous solution of urea.
Chinese Patent Application No. is 201210135244.1, entitled " large-scale engine SCR denitration method and its system " Patent document in, it is proposed that SCR is placed between turbocharger and engine, and by the partial air in scavenging air box The method for being directly bypassed to turbocharger upstream so that delivery temperature is raised.Such a method waste gas increasing extent of temperature is limited, no It can reach that large-sized low-speed two stroke diesel engine carries out optimum temperature needed for SCR denitration in, under underload.
Chinese Patent Application No. be 201010555816.2, it is entitled " by control row temperature realize the low row of large diesel engine In the patent document of the method and implementation put ", it is proposed that a kind of to realize large diesel engine low emission by the row's of control temperature Method, its technical scheme is the method and implementation of large diesel engine low emission to be realized by the row's of control temperature, by means of starting Row's temperature control unit of machine is realized, an infrared heater is bushed in into catalytic converter air inlet expansion segment, engine cold-start Stage control infrared heater improves exhaust temperature and catalytic conversion efficiency, when temperature reaches necessarily with pressure difference in catalytic converter During scope, ECU controls the opening and closing of infrared heater, promotes unburned product and complicated complex compound gas in retention mass Change, alleviate catalytic converter stopping state.
For large-sized two-stroke low-speed diesel engine, high pressure SCR system presently, there are problems with：
Low-speed diesel engine EGT is low, complicated component, and main frame exhaust gas conditions can not directly meet SCR job requirements, must Heating treatment must be carried out to its EGT, this will certainly further increase SCR system by different main frame modulation techniques Operation cost；
Because desulfurizer is typically disposed in after SCR in diesel engine, it means that waste gas still contains when reaching in SCR device There is a SO3, and when temperature is less than 300 DEG C, SO3 is easy to react generation hydrogen sulfate with the ammonia and vapor in SCR device Ammonium, ammonium hydrogen sulfate is attached to the catalytic reduction reaction that catalyst surface hinders SCR, further, because ammonium hydrogen sulfate is one Colloid substance is planted, its meeting adsorption particle formation composite deposition, so as to block the gas passage of catalyst block；
Two above problem can be solved by increase reaction surface area and increase gas passage, but by the sky of hull Between limit, it is difficult to realize.
The content of the invention
It is an object of the invention to provide can effectively improve engine exhaust on the basis of other heating devices are not increased Temperature, and alleviate SCR catalyst gas passage obstructing problem a kind of low-speed diesel engine SCR system suitable for high-sulfur fuel oil and Its control method.
The object of the present invention is achieved like this：
A kind of low-speed diesel engine SCR system suitable for high-sulfur fuel oil of the invention, it is characterized in that：Including inlet box, exhaust Case, turbocharger, SCR reactors, evaporation mixer, fumer and inlet box are respectively communicated with Diesel Engine Exhaust Pipe and air inlet Pipe, the first outlet of fumer connects the first entrance of evaporation mixer by evaporating communicating pipe, and the second outlet of fumer connects Logical scavenging bypass pipe, inlet box is respectively communicated with scavenging bypass pipe and the compressor of turbocharger, and the second of evaporation mixer enters Mouth connection reducing agent tank, the outlet SCR reactors of evaporation mixer, SCR reactors are connected by reactor bypass pipe Scavenging bypass pipe, scavenging bypass pipe pays exhaust gas bypass pipe and gas inlet casing, gas inlet casing connection turbocharger respectively Turbine inlet, exhaust gas bypass pipe connect turbocharger turbine outlet, turbocharger turbine outlet connection air.
A kind of low-speed diesel engine SCR system suitable for high-sulfur fuel oil of the invention can also include：
The 1st, scavenging bypass pipe at first valve group, fumer second outlet is set on the scavenging bypass pipe in inlet box exit 3rd valve group is set on the second valve group of upper setting, reactor bypass pipe, the 4th valve group, exhaust gas bypass pipe are set on evaporation communicating pipe The 5th valve group of upper setting.
A kind of low-speed diesel engine SCR control methods suitable for high-sulfur fuel oil of the invention, it is characterized in that：
When diesel engine is in low load condition, the first valve group, the 3rd valve group, the 4th valve group, the 5th valve group are opened, simultaneously Close the second valve group；When diesel engine is in middle load, the first valve group, the 3rd valve group, the 4th valve group, the 5th valve group are opened, together When close the second valve group；When diesel engine is in high load capacity, the 3rd valve group, the 4th valve group are opened, the first valve group, the is simultaneously closed off Two valve groups, the 5th valve group；When the non-emission control region of ship or SCR system break down, the second valve group is opened, is simultaneously closed off First valve group, the 3rd valve group, the 4th valve group, the 5th valve group.
Advantage of the invention is that：The present invention can improve the diesel exhaust temperature of SCR inlet, and hardly increase The marine low speed two stroke diesel engine high pressure SCR system of its volume and cost.It can not increase the basis of other heating devices On effectively improve engine exhaust gas temperature, and alleviate SCR catalyst gas passage obstructing problem.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1, present system mainly includes：Turbocharger 2, inlet box 3, diesel engine 4, fumer 5, evaporation are mixed Clutch 6, SCR reactors 8 and valve group V1-V5.Enter the air part bypass of inlet box 3 after being pressurized through turbocharger 2 To the turbine end entrance of turbocharger 2, another part air enters engine and participates in burning, and engine exhaust enters fumer 5, enter SCR reactors 8 via evaporation mixer 6, the waste gas after denitration is completed is divided into two parts, and a part increases via turbine Discharged after the acting of the turbine end of depressor 2, another fraction is directly entered the gas exhaust piping after turbine, is not involved in turbocharger 2 and does Work(.
Compressor connects inlet box 3 by pipeline, and inlet box 3 is connected by pipeline with diesel engine, and diesel exhaust gas mouthful is logical Cross gas exhaust piping with fumer 5 to be connected, fumer 5 is connected by gas exhaust piping and valve group V4 with evaporator mixing 6, evaporation mixing Another entrance of device 6 is connected with reducing agent tank 7, and the outlet of evaporation mixer 6 is connected by gas exhaust piping with SCR reactors 8, SCR Reactor 8 is connected by gas exhaust piping and valve group V3 with turbocharger 2, and turbocharger 2 is connected with gas exhaust piping, and discharge is useless Gas.
Meanwhile, another outlet of inlet box 3 is connected by pipeline and valve group V1 with by the gas exhaust piping after SCR reactors 8, It is common to enter turbocharger 2.When engine exhaust gas temperature is inadequate, valve group V1 is opened, part scavenging is entered discharge duct Hence into the turbine end entrance of turbocharger 2, to control the amount of fresh air into cylinder.When valve group V1 is opened, portion Fresh air is divided to flow into blast pipe, the amount of fresh air into cylinder will be reduced, but scavenging pressure keeps constant.Disappear in fuel oil In the case of consumption is increased, diesel exhaust temperature is necessarily increased, and its elevated-levels depends on the increase of fuel consumption Situation.
In addition, the outlet of the other end of fumer 5 is by pipeline and valve group V2 and enters before the turbine end entrance of turbocharger 2 Gas exhaust piping be connected, it is common to enter turbocharger 2.When ship running in non-emission control area or SCR system failure (such as Block serious) when, valve group V2 is opened, and valve group V1, V3, V4 are closed, and exhaust directly enters turbocharger 2, SCR systems from fumer System is in off position.
Finally, one is set up after valve V2 and between the gas exhaust piping before the turbine end entrance of turbocharger 2 Bar gas exhaust piping, is directly connected by valve group V5 with the gas exhaust piping after the turbine end of turbocharger 2, i.e., without turbocharging Device 2 is expelled directly out a part of waste gas.If Diesel NOx discharge disclosure satisfy that emission request, valve group V5 is closed, if diesel engine NOx emission can not meet emission request, then open valve group V5, and the front-seat atmospheric pressure of reduction turbine, so as to reduce air inlet, improves waste gas Temperature, to ensure that Diesel NOx discharge meets emission request.
Specific control method see the table below：
Table 1：Valve group switching strategy in main frame modulation scheme
Main unit load Modulation condition Valve group V1 Valve group V2 Valve group V3 Valve group V4 Valve group V5
Underload It is Open Close Open Open Open
Middle load It is Open Close Open Open Open
High load capacity It is no Close Close Open Open Close
Bypass state It is no Close Open Close Close Close
Diesel engine is in, underload when, EGT can not reach SCR reaction needed for catalytic temperature, and easily obstruction catalysis Agent gas passage, so need to make waste gas heat up using cylinder bypass integrated pressurizing device bypass modulation scheme.Concrete operations are：Valve group V1, V3, V4, V5 are opened, and valve group V2 is closed.
Now, valve group V1 is opened, by the way that the portion gas in scavenging air box is direct from the upstream at turbocharger turbine end Discharge so that enter fresh air total amount in main frame cylinder and reduce, air-fuel ratio reduction, fuel oil burning is insufficient, due to main frame modulation Need to ensure that its power output is constant, it is therefore desirable to increase distributive value, in the case of fuel consumption is increased, diesel exhaust Temperature is necessarily increased, and denitration efficiency is improved, while can effectively mitigate catalyst blockage phenomenon.
Valve group V5 is opened, and a part of waste gas after denitration is expelled directly out without turbocharger, into the waste gas of turbine Amount is reduced so that booster air inlet amount is also reduced, and equally reduces the fresh air total amount into cylinder so that air inlet Pressure is reduced, air-fuel ratio reduction, EGT rise, and then improves denitration efficiency, mitigates catalyst blockage phenomenon.
Diesel engine is in high load capacity, and EGT can meet the catalytic temperature needed for denitrating catalyst, so be not required into Row main frame is modulated, i.e. valve group V1, V2, V5 is closed, and V3, V4 are opened, SCR system normal work.
When ship running breaks down (as serious in blocked) in non-emission control region or SCR system, valve group V2 is opened, V1, V3, V4, V5 are closed, and now SCR system is closed, and waste gas is directly entered turbocharger.
The present invention directly bypasses the portion gas in the scavenging air box of engine to before turbocharger, is started with reducing Admission pressure, air-fuel ratio in machine cylinder, improve the delivery temperature of engine, and the portion discharge after denitration is bypassed to whirlpool Take turns after booster, reduce turbocharger air inlet, to reduce the scavenging into engine, so that into SCR exhaust Temperature is raised.It is when diesel engine is in, underload, the portion gas in scavenging air box is straight from the upstream at turbocharger turbine end Run in.When diesel engine is in, underload, a part of waste gas after denitration is expelled directly out without turbocharger.Work as bavin Oil machine directly carries out denitration process to the exhaust that engine is produced, does not add any bypass in high load capacity.When ship running exists When non-emission control region or system failure, the waste gas of engine is directly arranged to turbocharger, at denitration Reason.

Claims (3)

1. a kind of low-speed diesel engine SCR system suitable for high-sulfur fuel oil, it is characterized in that：Increase including inlet box, fumer, turbine Depressor, SCR reactors, evaporation mixer, fumer and inlet box are respectively communicated with Diesel Engine Exhaust Pipe and air inlet pipe, fumer First outlet connects the first entrance of evaporation mixer, the second outlet connection scavenging bypass of fumer by evaporating communicating pipe Pipe, inlet box is respectively communicated with scavenging bypass pipe and the compressor of turbocharger, the second entrance connection reduction of evaporation mixer Agent tank, the outlet SCR reactors of evaporation mixer, SCR reactors connect scavenging bypass pipe by reactor bypass pipe, Scavenging bypass pipe pays exhaust gas bypass pipe and gas inlet casing respectively, and gas inlet casing connects the turbine inlet of turbocharger, Exhaust gas bypass pipe connects the turbine outlet of turbocharger, the turbine outlet connection air of turbocharger.
2. a kind of low-speed diesel engine SCR system suitable for high-sulfur fuel oil according to claim 1, it is characterized in that：Air inlet Set on the scavenging bypass pipe in case exit and the second valve is set on the scavenging bypass pipe at the first valve group, fumer second outlet 3rd valve group is set on group, reactor bypass pipe, is set on evaporation communicating pipe and the 5th valve is set on the 4th valve group, exhaust gas bypass pipe Group.
3. a kind of low-speed diesel engine SCR control methods suitable for high-sulfur fuel oil, it is characterized in that：
When diesel engine is in low load condition, the first valve group, the 3rd valve group, the 4th valve group, the 5th valve group are opened, is simultaneously closed off Second valve group；When diesel engine is in middle load, the first valve group, the 3rd valve group, the 4th valve group, the 5th valve group are opened, is closed simultaneously Close the second valve group；When diesel engine is in high load capacity, the 3rd valve group, the 4th valve group are opened, the first valve group, the second valve is simultaneously closed off Group, the 5th valve group；When the non-emission control region of ship or SCR system break down, the second valve group is opened, first is simultaneously closed off Valve group, the 3rd valve group, the 4th valve group, the 5th valve group.
CN201710332165.2A 2017-05-12 2017-05-12 Low-speed diesel engine SCR system suitable for high-sulfur fuel oil and control method thereof Active CN107143418B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110552774A (en) * 2019-09-30 2019-12-10 中船澄西船舶修造有限公司 Diesel engine exhaust system of wood chip ship
CN112648048A (en) * 2019-10-11 2021-04-13 中国船舶重工集团公司第七一一研究所 High-pressure SCR (selective catalytic reduction) ventilation and pressure stabilization system of marine diesel engine and ship

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CN105003326A (en) * 2015-07-28 2015-10-28 青岛双瑞海洋环境工程股份有限公司 Marine exhaust denitration system
KR20160028265A (en) * 2014-09-03 2016-03-11 현대중공업 주식회사 Intake/Exhaust System Combined Differentiated Turbochargers with SCR System
CN105944567A (en) * 2016-06-24 2016-09-21 青岛双瑞海洋环境工程股份有限公司 Ship exhaust gas denitration system
CN205730896U (en) * 2016-05-06 2016-11-30 哈尔滨工程大学 A kind of marine low speed diesel engine vent gas post processing set composite
CN106640291A (en) * 2016-12-08 2017-05-10 青岛双瑞海洋环境工程股份有限公司 Ship waste gas denitration system

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Publication number Priority date Publication date Assignee Title
US20140053553A1 (en) * 2012-08-24 2014-02-27 Caterpillar, Inc. NOx Emission Control Using Large Volume EGR
KR20160028265A (en) * 2014-09-03 2016-03-11 현대중공업 주식회사 Intake/Exhaust System Combined Differentiated Turbochargers with SCR System
CN105003326A (en) * 2015-07-28 2015-10-28 青岛双瑞海洋环境工程股份有限公司 Marine exhaust denitration system
CN205730896U (en) * 2016-05-06 2016-11-30 哈尔滨工程大学 A kind of marine low speed diesel engine vent gas post processing set composite
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110552774A (en) * 2019-09-30 2019-12-10 中船澄西船舶修造有限公司 Diesel engine exhaust system of wood chip ship
CN110552774B (en) * 2019-09-30 2023-12-26 中船澄西船舶修造有限公司 Exhaust system of wood chip ship diesel engine
CN112648048A (en) * 2019-10-11 2021-04-13 中国船舶重工集团公司第七一一研究所 High-pressure SCR (selective catalytic reduction) ventilation and pressure stabilization system of marine diesel engine and ship
WO2021068945A1 (en) * 2019-10-11 2021-04-15 上海船用柴油机研究所 High-pressure scr ventilation and pressure stabilisation system for ship diesel engine and ship provided with same

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