CN105781760A - System and method for reducing NOx emission of marine diesel engine - Google Patents

System and method for reducing NOx emission of marine diesel engine Download PDF

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Publication number
CN105781760A
CN105781760A CN201610172358.1A CN201610172358A CN105781760A CN 105781760 A CN105781760 A CN 105781760A CN 201610172358 A CN201610172358 A CN 201610172358A CN 105781760 A CN105781760 A CN 105781760A
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China
Prior art keywords
diesel engine
urea
fuel
selective catalytic
substitute fuel
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CN201610172358.1A
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Chinese (zh)
Inventor
耿鹏
魏立江
曹尔明
蒋楷
张春辉
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Shanghai Maritime University
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Shanghai Maritime University
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Priority to CN201610172358.1A priority Critical patent/CN105781760A/en
Publication of CN105781760A publication Critical patent/CN105781760A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
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    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
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    • 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]
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    • 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
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Abstract

The invention discloses a system and method for reducing NOx emission of a marine diesel engine. The system comprises an air inlet pre-treatment system and a posttreatment selective catalytic reduction system. The air inlet pre-treatment system comprises an alternate fuel supply system and a fuel electronic control system. The posttreatment selective catalytic reduction system is arranged on a diesel engine exhaust pipe and can receive tail gas exhausted by a diesel engine air cylinder. The posttreatment selective catalytic reduction system comprises a diesel oxidation catalyst device and a selective catalytic reduction device which are sequentially arranged. The invention further provides the method for reducing NOx emission of the marine diesel engine with the system. According to the system and method for reducing NOx emission of the marine diesel engine, traditional petroleum fuel, namely diesel consumed by the marine diesel engine is replaced, meanwhile, NOx emission of the marine diesel engine can be greatly reduced, NOx emission is maintained at a very low level, and efficient clean combustion of the marine diesel engine is achieved.

Description

A kind of system and method reducing boat diesel engine NOx emission
Technical field
The present invention relates to a kind of system and method processing boat diesel engine emission in air pollution control technique, in particular it relates to a kind of air inlet pre-treatment combines post processing selective catalytic reduction system operating reduces boat diesel engine NOxThe system and method for discharge.
Background technology
Boat diesel engine is the main flow power such as China Logistics, passenger traffic and national defence, and fuel consumption is big, and noxious emission is high.Nitrogen oxides (the NO of its dischargex) it is one of main atmosphere pollution, NOxHarm mainly have a three below aspect: produce acid rain, cause ecological disruption；Infringement human health, particularly respiratory tract；Damage the ozone layer, aggravate greenhouse effects.For Pollution From Ships thing, International Maritime Organization (IMO) has formulated corresponding boats and ships Abgasgesetz, to NOxDischarge has carried out strict restriction.
NO currently for boat diesel enginexThe major measure that discharge is used is directly to spray water and fuel emulsification, and directly water spray refers to that clean water is injected directly into cylinder of diesel engine combustion chamber reduces NO to reduce the maximum temperature burntxDischarge, fuel emulsification uses after referring to heavy oil, water and emulsifying agent stir mixing according to a certain percentage, reduces NO by reducing ignition temperaturexDischarge.But both ways are to NOxThe limited use reduced, and the loss to boat diesel engine is relatively big, use cost is higher, it is difficult to be widely applied on boat diesel engine.
Summary of the invention
It is an object of the invention to provide a kind of system and method for large ship diesel engine, by the minimum transformation in boat diesel engine structure, it is ensured that its stability run and reliability, while realizing diesel fuel vast scale is substituted, reduce the NO in tail gasxDischarge.
In order to achieve the above object, the invention provides a kind of reduction boat diesel engine NOxThe system of discharge, wherein, this system comprises this air inlet preprocessing system and post processing selective catalytic reduction system operating；Described air inlet preprocessing system comprises substitute fuel supply system and fuel electronic control system；Substitute fuel can be ejected in cylinder of diesel engine by described substitute fuel supply system；Substitute fuel supply system can be controlled accordingly by described fuel electronic control system by gathering the work information of cylinder of diesel engine；Described post processing selective catalytic reduction system operating, is arranged in Diesel Engine Exhaust Pipe, it is possible to receive the tail gas of cylinder of diesel engine discharge；Described post processing selective catalytic reduction system operating comprises the diesel oxidation catalyst and selective catalytic reduction device set gradually.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described substitute fuel comprises oxygenated fuel and natural gas etc..
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described substitute fuel supply system comprises substitute fuel injection apparatus and substitute fuel feedway；Described substitute fuel injection apparatus comprises material rail and substitute fuel nozzle；Material rail is made of stainless steel, and substitute fuel nozzle uses corresponding special nozzle according to the difference of substitute fuel kind.Described material rail is provided with some substitute fuel nozzles；Described substitute fuel nozzle is separately positioned on the upper position corresponding with at each cylinder air inlet of cylinder of diesel engine inlet manifold, and the described position corresponding with at each cylinder air inlet is respectively equipped with the substitute fuel spout suitable with described substitute fuel nozzle.Preferably, every cylinder installs 2 big flow nozzles additional, and injection flow and the range of jet of nozzle are basically identical, to ensure uniformity and the uniformity of each cylinder gaseous mixture.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described substitute fuel feedway comprises substitute fuel case, fuel filter, petrolift, pressure regulator valve and cartridge；Described petrolift is arranged in substitute fuel case；Described cartridge uses corresponding corrosion-resistant low temperature resistant pipeline according to the difference of substitute fuel kind, it connects one end of the material rail in the petrolift in substitute fuel case and substitute fuel injection apparatus, and described fuel filter and described pressure regulator valve are separately positioned on the cartridge between petrolift and material rail；Substitute fuel is entered in material rail via fuel filter and pressure regulator valve from fuel tank by described petrolift by cartridge, and makes to keep in material rail certain rail pressure.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described substitute fuel nozzle, its emitted dose and injecting time can be controlled by fuel electronic control system；Described fuel electronic control system comprises fuel electronic control unit (ECU), the work information of its cylinder of diesel engine that can gather comprises water temperature, rotating speed and accelerator open degree etc., and cylinder of diesel engine is provided with corresponding cylinder pressure sensor etc. and gathers the instrument of work information.This fuel electronic control unit (ECU) is stand-alone development, emitted dose and the injecting time of fuel are accurately controlled by the work information according to boat diesel engine, simultaneously according to the feature that boat diesel engine intake and exhaust angle overlap is big, use the mode of sequence-injection, to ensure that having more fuel to enter in cylinder fully burns, improve efficiency of combustion, reduce NO simultaneouslyxDischarge.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described diesel oxidation catalyst (Diesel Oxidation Catalyst, DOC) is made up of ceramic honey comb matrix；It is coated with catalyst coat on described ceramic honey comb matrix.Coating main material type is rare earth composite perofskite and rare earth composite zeolite molecular sieve, is properly added alkaline-earth metal or transition metal.In coating, carrying capacity is medium, to play stabilizing material structure, improves THC(total hydrocarbons, total carbon hydrocarbon) and the conversion ratio of CO.Wherein catalyst uses noble metal, and based on platinum (Pt), palladium (Pd) is auxiliary, and consumption is low, and technique uses noble metal to upload ion exchange coating.DOC uses and is deposited on the catalyst on the biggest carrier surface as catalysis element, reduce the activation energy of chemical reaction, make the HC(hydrocarbons in tail gas, hydrocarbon) and the oxidation reaction of CO can carry out the most soon, make partially or mostly HC and CO in exhaust and the O of residual in discharge2Reaction, generates harmless CO2And H2O。
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described SCR (Selective Catalytic Reduction, SCR) device, comprise urea selective catalytic reduction device (NH3-SCR), urea dosage electronic control unit (DCU), urea injection system and sensor；Described urea dosage electronic control unit is able to receive that the information of described sensor collection and controls urea injection system accordingly.It is to say, urea injection can accurately be controlled by described selective catalytic reduction device, and NO can be efficiently solvedxConversion ratio and NH3The contradiction of leakage rate balance.Described urea selective catalytic reduction device, the catalyst of employing is V2O5/TiO2, it has denitration rate height, active temperature range width, its usage economy high；By selecting this catalyst, make NOxReaction temperature interval extension to 300 ~ 400 DEG C.The NO of 95% in diesel engine vent gasxPresented in NO, therefore NH3Reaction with NO is that standard SCR is reacted.The condition that standard chemical reaction occurs is NH3The ratio of the amount of/NO material is 1:1, and there is less O2.When temperature is less than 350 DEG C, NO/NO2For 1:1, NH3Consumption be NO and NO2Sum, now NH3With NO and NO2Reaction be the main chemical reaction occurred, the quickest SCR reacts.When temperature is higher than 350 DEG C, the existence that NO can be more, now there is the reaction of standard SCR.When temperature is higher than 300 DEG C, NH3With NO2React with the ratio of 4:3, the most at a slow speed SCR reaction.In cylinder of diesel engine air inlet pipe, spray substitute fuel (oxygenated fuel, natural gas etc.) by the method for air inlet pre-treatment, it is possible to suitable reduction delivery temperature, install DOC simultaneously additional and can reduce the HC in exhaust and reduce it to NOxThe inhibitory action converted, thus improve NO furtherxCatalytic conversion efficiency, reduce the NO in tail gasxDischarge.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described urea injection system comprises urea box, urea tube and urea nozzle, and described urea tube connects urea box and urea nozzle；Described urea nozzle is arranged between diesel oxidation catalyst and urea selective catalytic reduction device, and i.e. in the Diesel Engine Exhaust Pipe before urea selective catalytic reduction device, its emitted dose and injecting time can be controlled by urea dosage electronic control unit.
Above-mentioned reduction boat diesel engine NOxThe system of discharge, wherein, described sensor comprises NOxSensor, NH3Sensor, temperature sensor and back pressure transducer；Described temperature sensor is arranged on described urea selective catalytic reduction device；Between diesel oxidation catalyst and urea selective catalytic reduction device, i.e. Diesel Engine Exhaust Pipe before urea selective catalytic reduction device is provided with NOxSensor and NH3Sensor；Diesel Engine Exhaust Pipe after urea selective catalytic reduction device is provided with NOxSensor, NH3Sensor and back pressure transducer.
Present invention also offers a kind of above-mentioned system and reduce boat diesel engine NOxThe method of discharge.
The reduction boat diesel engine NO that the present invention providesxThe system and method for discharge has the advantage that
The present invention uses air inlet pre-treatment to combine the technology path of SCR system, substitute fuel (oxygenated fuel, natural gas etc.) is sprayed in cylinder of diesel engine air inlet pipe, utilize its latent heat of vaporization big, the feature that excess air coefficient is little, reach to reduce NO by reducing cylinder temperature and minimizing gaseous mixture oxygen contentxThe purpose generated, installs SCR system, to the NO in tail gas on blast pipe simultaneouslyxIt is discharged into row to purify further.Use this kind of technology path, be not only able to vast scale diesel oil substitute fuel, and boat diesel engine NO can be greatly loweredxDischarge, it is achieved boat diesel engine NOxMinimum discharge.
Accompanying drawing explanation
Fig. 1 is the reduction boat diesel engine NO of the present inventionxThe structural representation of the system of discharge.
Fig. 2 is the reduction boat diesel engine NO of the present inventionxThe post processing selective catalytic reduction system operating schematic diagram of the system of discharge.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is further described.
As it is shown in figure 1, the reduction boat diesel engine NO that the present invention providesxThe system of discharge, comprises this air inlet preprocessing system and post processing selective catalytic reduction system operating.
Air inlet preprocessing system comprises substitute fuel supply system and fuel electronic control system.
Substitute fuel supply system can be controlled accordingly by fuel electronic control system by gathering the work information of cylinder of diesel engine 1.
Substitute fuel comprises oxygenated fuel and natural gas etc..
Substitute fuel can be ejected in cylinder of diesel engine 1 by substitute fuel supply system.
Substitute fuel supply system comprises substitute fuel injection apparatus and substitute fuel feedway.
Substitute fuel injection apparatus comprises material rail 6 and substitute fuel nozzle 7；Material rail 6 is made of stainless steel, and substitute fuel nozzle 7 uses corresponding special nozzle according to the difference of substitute fuel kind.Material rail 6 is provided with some substitute fuel nozzles 7；Substitute fuel nozzle 7 is separately positioned on cylinder of diesel engine 1 inlet manifold 3 position corresponding with at each cylinder air inlet, and the position corresponding with at each cylinder air inlet is respectively equipped with the substitute fuel spout 22 suitable with substitute fuel nozzle 7.Preferably, every cylinder installs the substitute fuel nozzle 7 of 2 big flows additional, and its injection flow and range of jet are basically identical, to ensure uniformity and the uniformity of each cylinder gaseous mixture.
Substitute fuel feedway comprises substitute fuel case 8, fuel filter 9, petrolift 10, pressure regulator valve 11 and cartridge 12；Petrolift 10 is arranged in substitute fuel case 8；Cartridge 12 uses corresponding corrosion-resistant low temperature resistant pipeline according to the difference of substitute fuel kind, it connects one end of the material rail 6 in the petrolift 10 in substitute fuel case 8 and substitute fuel injection apparatus, and fuel filter 9 and pressure regulator valve 11 are separately positioned on the cartridge 12 between petrolift 10 and material rail 6；Substitute fuel is entered in material rail 6 via fuel filter 9 and pressure regulator valve 11 from substitute fuel case 8 by petrolift 10 by cartridge 12, and makes to keep in material rail 6 certain rail pressure.
The emitted dose of substitute fuel nozzle 7 and injecting time can be controlled by fuel electronic control system；Fuel electronic control system comprises fuel electronic control unit (ECU) 13, the work information of the cylinder of diesel engine 1 that it can gather comprises water temperature, rotating speed and accelerator open degree etc., and cylinder of diesel engine 1 is provided with corresponding cylinder pressure sensor 23 grade and gathers the instrument of work information.This fuel electronic control unit (ECU) 13 is stand-alone development, emitted dose and the injecting time of fuel are accurately controlled by the work information according to boat diesel engine, simultaneously according to the feature that boat diesel engine intake and exhaust angle overlap is big, use the mode of sequence-injection, to ensure that having more fuel to enter in cylinder 1 fully burns, improve efficiency of combustion, reduce NO simultaneouslyxDischarge.
As in figure 2 it is shown, post processing selective catalytic reduction system operating is arranged in Diesel Engine Exhaust Pipe 2, it is possible to receive the tail gas of cylinder of diesel engine 1 discharge.Post processing selective catalytic reduction system operating comprises the diesel oxidation catalyst 4 and selective catalytic reduction device set gradually.
Diesel oxidation catalyst (DOC) 4 is made up of ceramic honey comb matrix；It is coated with catalyst coat on ceramic honey comb matrix.Coating main material type is rare earth composite perofskite and rare earth composite zeolite molecular sieve, is properly added alkaline-earth metal or transition metal.In coating, carrying capacity is medium, to play stabilizing material structure, improves the effect of the conversion ratio to THC and CO.Wherein catalyst uses noble metal, and based on platinum (Pt), palladium (Pd) is auxiliary, and consumption is low, and technique uses noble metal to upload ion exchange coating.DOC uses and is deposited on the catalyst on the biggest carrier surface as catalysis element, reduce the activation energy of chemical reaction, the oxidation reaction making HC and CO in tail gas can be carried out the most soon, makes partially or mostly HC and CO and the O of residual in discharge in exhaust2Reaction, generates harmless CO2And H2O。
SCR (SCR) device, comprises urea selective catalytic reduction device (NH3-SCR) 5, urea dosage electronic control unit (DCU) 14, urea injection system and sensor.
Urea dosage electronic control unit 14 is able to receive that the information of sensor collection and controls urea injection system accordingly.Therefore, urea injection can accurately be controlled by selective catalytic reduction device, and can efficiently solve NOxConversion ratio and NH3The contradiction of leakage rate balance.
Urea selective catalytic reduction device 5, the catalyst of employing is V2O5/TiO2, it has denitration rate height, active temperature range width, its usage economy high；By selecting this catalyst, make NOxReaction temperature interval extension to 300 ~ 400 DEG C.The NO of 95% in diesel engine vent gasxPresented in NO, therefore NH3Reaction with NO is that standard SCR is reacted.The condition that standard chemical reaction occurs is NH3The ratio of the amount of/NO material is 1:1, and there is less O2.When temperature is less than 350 DEG C, NO/NO2For 1:1, NH3Consumption be NO and NO2Sum, now NH3With NO and NO2Reaction be the main chemical reaction occurred, the quickest SCR reacts.When temperature is higher than 350 DEG C, the existence that NO can be more, now there is the reaction of standard SCR.When temperature is higher than 300 DEG C, NH3With NO2React with the ratio of 4:3, the most at a slow speed SCR reaction.
The principle of SCR system is: at certain temperature and catalyst action, and reducing agent (ammonia, urea and hydrocarbon etc.) is selectively the NO in tail gasxIt is reduced to the N of nonhazardous2And H2O.SCR reaction equation with ammonia as reducing agent is as follows:
4NH3+ 4NO + O2= 4N2+ 6H2O
4NH3+2NO + 2NO2 = 4N2+ 6H2O
4NH3+ 2NO2 + O2 = 3N2+ 6H2O
8NH3+ 6NO2 = 7N2+ 12H2O
Urea injection system comprises urea box 15, urea tube 16 and urea nozzle 17, and urea tube 16 connects urea box 15 and urea nozzle 17；Urea nozzle 17 is arranged between diesel oxidation catalyst 4 and urea selective catalytic reduction device 5, and i.e. in the Diesel Engine Exhaust Pipe 2 before urea selective catalytic reduction device 5, its emitted dose and injecting time can be controlled by urea dosage electronic control unit 14.
Sensor comprises NOxSensor 18, NH3Sensor 19, temperature sensor 20 and back pressure transducer 21；Temperature sensor 20 is arranged on urea selective catalytic reduction device 5；Between diesel oxidation catalyst 4 and urea selective catalytic reduction device 5, i.e. Diesel Engine Exhaust Pipe 2 before urea selective catalytic reduction device 5 is provided with NOxSensor 18 and NH3Sensor 19；The Diesel Engine Exhaust Pipe 2 of urea selective catalytic reduction device 5 rear end is provided with NOxSensor 18, NH3Sensor 19 and back pressure transducer 21.
This post processing selective catalytic reduction system operating, in cylinder of diesel engine 1 air inlet pipe, substitute fuel (oxygenated fuel, natural gas etc.) is sprayed by air inlet pretreatment technology, reduction delivery temperature that can be suitable, installs DOC simultaneously additional and can reduce the HC in exhaust and reduce it to NOxThe inhibitory action converted, thus improve NO furtherxCatalytic conversion efficiency, reduce the NO in tail gasxDischarge.
Present invention also offers a kind of above-mentioned system and reduce boat diesel engine NOxThe method of discharge.Air inlet preprocessing system and post processing SCR system are combined by the method.On the one hand by spraying into substitute fuel (oxygenated fuel, natural gas etc.) in air inlet pipe of diesel engine, injecting time and the emitted dose of substitute fuel are controlled by the ECU developed specially, substitute fuel is injected in air inlet pipe carry out being thoroughly mixed to form homogeneous with fresh air or quasi-homogenous mixture enters in cylinder 1 and the most diesel oil ignited by direct-injection to cylinder, realize gas-phase combustion, thus realize the replacement to diesel oil and boat diesel engine NO is greatly loweredxDischarge；On the other hand, by installing SCR system additional on blast pipe 2, the ammonia gone out by the Urea Evaporation sprayed under certain temperature range and catalyst action to the NO in tail gasxCarry out SCR and become N2And H2O thus reduce the NO of boat diesel engine furtherxDischarge.
The reduction boat diesel engine NO that the present invention providesxThe system and method for discharge, reduces NO by utilizing the features such as its latent heat of vaporization is big, excess air coefficient is little to reduce in-cylinder combustion temperature and gaseous mixture oxygen content at cylinder of diesel engine 1 intake manifold injection substitute fuel (oxygenated fuel, natural gas etc.)xDischarge, and reduce NO in tail gas further by SCR systemxDischarge, it is achieved boat diesel engine NOxMinimum discharge.Present invention is particularly suitable for application in large ship diesel engine, little to the structure of modification of boat diesel engine, it is possible to ensure stability and the reliability of diesel engine operation, realizing being greatly lowered while diesel fuel vast scale substitutes the NO of marine dieselxDischarge.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that the description above is not considered as limitation of the present invention.After those skilled in the art have read foregoing, multiple amendment and replacement for the present invention all will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (10)

1. one kind is reduced boat diesel engine NOxThe system of discharge, it is characterised in that this system comprises this air inlet preprocessing system and post processing selective catalytic reduction system operating；
Described air inlet preprocessing system comprises substitute fuel supply system and fuel electronic control system；
Substitute fuel can be ejected in cylinder of diesel engine (1) by described substitute fuel supply system；
Substitute fuel supply system can be controlled accordingly by described fuel electronic control system by gathering the work information of cylinder of diesel engine (1)；
Described post processing selective catalytic reduction system operating, is arranged in Diesel Engine Exhaust Pipe (2), it is possible to receive the tail gas that cylinder of diesel engine (1) discharges；Described post processing selective catalytic reduction system operating comprises the diesel oxidation catalyst (4) and selective catalytic reduction device set gradually.
2. reduction boat diesel engine NO as claimed in claim 1xThe system of discharge, it is characterised in that described substitute fuel comprises oxygenated fuel and natural gas.
3. reduction boat diesel engine NO as claimed in claim 1xThe system of discharge, it is characterised in that described substitute fuel supply system comprises substitute fuel injection apparatus and substitute fuel feedway；
Described substitute fuel injection apparatus comprises material rail (6) and substitute fuel nozzle (7)；Described material rail (6) is provided with some substitute fuel nozzles (7)；Described substitute fuel nozzle (7) is separately positioned on the upper position corresponding with at each cylinder air inlet of cylinder of diesel engine (1) inlet manifold (3).
4. reduction boat diesel engine NO as claimed in claim 3xThe system of discharge, it is characterised in that described substitute fuel feedway comprises substitute fuel case (8), fuel filter (9), petrolift (10), pressure regulator valve (11) and cartridge (12)；Described petrolift (10) is arranged in substitute fuel case (8)；Described cartridge (12) connects the petrolift (10) in substitute fuel case (8) and one end of the material rail (6) in substitute fuel injection apparatus；Described fuel filter (9) and described pressure regulator valve (11) are separately positioned on the cartridge (12) between petrolift (10) and material rail (6).
5. reduction boat diesel engine NO as claimed in claim 3xThe system of discharge, it is characterised in that described substitute fuel nozzle (7), its emitted dose and injecting time can be controlled by fuel electronic control system；Described fuel electronic control system comprises fuel electronic control unit (13), and the work information of its cylinder of diesel engine that can gather (1) comprises water temperature, rotating speed and accelerator open degree.
6. reduction boat diesel engine NO as claimed in claim 1xThe system of discharge, it is characterised in that described diesel oxidation catalyst (4) is made up of ceramic honey comb matrix；It is coated with catalyst coat on described ceramic honey comb matrix.
7. reduction boat diesel engine NO as claimed in claim 1xThe system of discharge, it is characterised in that described selective catalytic reduction device, comprises urea selective catalytic reduction device (5), urea dosage electronic control unit (14), urea injection system and sensor；Described urea selective catalytic reduction device (5), the catalyst of employing is V2O5/TiO2 ；Described urea dosage electronic control unit (14) is able to receive that the information of described sensor collection and controls urea injection system accordingly.
8. reduction boat diesel engine NO as claimed in claim 7xThe system of discharge, it is characterised in that described urea injection system comprises urea box (15), urea tube (16) and urea nozzle (17), described urea tube (16) connects urea box (15) and urea nozzle (17)；Described urea nozzle (17) is arranged in the Diesel Engine Exhaust Pipe (2) that urea selective catalytic reduction device (5) is front, and its emitted dose and injecting time can be controlled by urea dosage electronic control unit (14).
9. reduction boat diesel engine NO as claimed in claim 7xThe system of discharge, it is characterised in that described sensor comprises NOxSensor (18), NH3Sensor (19), temperature sensor (20) and back pressure transducer (21)；Described temperature sensor (20) is arranged on described urea selective catalytic reduction device (5)；The front Diesel Engine Exhaust Pipe (2) of urea selective catalytic reduction device (5) is provided with NOxSensor (18) and NH3Sensor (19)；Diesel Engine Exhaust Pipe (2) after urea selective catalytic reduction device (5) is provided with NOxSensor (18), NH3Sensor (19) and back pressure transducer (21).
10. one kind uses in claim 1 ~ 9 system described in any one to reduce boat diesel engine NOxThe method of discharge.
CN201610172358.1A 2016-03-24 2016-03-24 System and method for reducing NOx emission of marine diesel engine Pending CN105781760A (en)

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Publication number Priority date Publication date Assignee Title
CN109236437A (en) * 2017-07-10 2019-01-18 通用汽车环球科技运作有限责任公司 The detection of selective catalytic reduction stable state NH_3 leakage
CN110578580A (en) * 2019-08-30 2019-12-17 中船澄西船舶修造有限公司 Arrangement structure in main engine SCR engine room for small and medium-sized ships
CN111219235A (en) * 2018-11-23 2020-06-02 宝沃汽车（中国）有限公司 Vehicle exhaust gas treatment method, device, storage medium and vehicle

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CN203978674U (en) * 2014-05-08 2014-12-03 山西成功投资集团有限公司 A kind of gasoline/methyl alcohol dual-purpose fuel car is with rail fuel supply system
CN204163811U (en) * 2014-04-23 2015-02-18 同济大学 A kind of varying vehicle exhaust emissions processing system

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US20020029564A1 (en) * 2000-02-22 2002-03-14 Engelhard Corporation System for reducing NOx transient emission
EP1331373A2 (en) * 2002-01-29 2003-07-30 Toyota Jidosha Kabushiki Kaisha Reductant supply system
CN204163811U (en) * 2014-04-23 2015-02-18 同济大学 A kind of varying vehicle exhaust emissions processing system
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CN109236437A (en) * 2017-07-10 2019-01-18 通用汽车环球科技运作有限责任公司 The detection of selective catalytic reduction stable state NH_3 leakage
CN111219235A (en) * 2018-11-23 2020-06-02 宝沃汽车（中国）有限公司 Vehicle exhaust gas treatment method, device, storage medium and vehicle
CN110578580A (en) * 2019-08-30 2019-12-17 中船澄西船舶修造有限公司 Arrangement structure in main engine SCR engine room for small and medium-sized ships
CN110578580B (en) * 2019-08-30 2023-12-26 中船澄西船舶修造有限公司 Main engine SCR cabin internal arrangement structure for small and medium-sized ships

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Application publication date: 20160720