CN206845280U - A kind of exhaust gas purification system of marine diesel engine - Google Patents
A kind of exhaust gas purification system of marine diesel engine Download PDFInfo
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- CN206845280U CN206845280U CN201720780942.5U CN201720780942U CN206845280U CN 206845280 U CN206845280 U CN 206845280U CN 201720780942 U CN201720780942 U CN 201720780942U CN 206845280 U CN206845280 U CN 206845280U
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- exhaust gas
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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
- 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
- Y02T10/40—Engine management systems
Abstract
The utility model provides a kind of exhaust gas purification system of marine diesel engine, belongs to environmental technology field.The exhaust gas purification system includes the particulate matter filter device sequentially set and catalysis oxidation/reduction apparatus；Wherein, the particulate matter filter device is grain bed, for removing the particulate matter of PM2.5 levels and the above；Catalysis oxidation/the reduction apparatus is multistage reactor, for removing denitrification, carbon monoxide and hydro carbons.Gaseous urea liquid is directly sufficiently mixed with high-temperature tail gas in the utility model, so as to produce gaseous ammonia, it instead of the gaseous ammonia generating means in conventional art, the structure of exhaust purifier provided by the utility model is simple, small volume, in light weight, more for practicality.In addition, also add secondary reactor, carrying out effective catalysis to carbon monoxide and hydro carbons reduces, and reaches the purpose reliably purified.
Description
Technical field
It the utility model is related to a kind of exhaust gas purification system of marine diesel engine.
Background technology
Shipping industrial development is rapid, turns into the main force of logistics, cargo handling capacity 107.8 is completed at national harbour within 2015
Hundred million tons, wherein foreign trade handling capacity is 38 and 51 times in 1978 respectively, the traffic of a port keeps generation for years up to 30.6 hundred million tons
Boundary first.
But marine diesel exhaust emissions：Emission harm is big, discharge capacity is big, seriously polluted.Contain in the exhaust of ship machine
The exhaust contaminants such as carbon monoxide, hydrocarbon, oxynitrides, sulfur dioxide, particulate matter.American National Environmental Protection Agency is by bavin
40 multiple compounds of oil machine discharge have been included in " Hazardous Air Polluant inventory "（HAPs）, such as：Formaldehyde, acetaldehyde, 1,3- fourths
The compound of the metal such as diene, benzene, multiring aromatic hydrocarbon and arsenic, lead, mercury, manganese.
In relevant laws and regulations, for environmental requirement, state's laws, regulation improve emission request.Such as atmosphere pollution is prevented
Therapy》Formally implement etc. a series of relevant laws and regulations, Environmental Protection Department is formally issued《Engine of boat and ship tailpipe emission
Limit value and measuring method（Chinese first and second stage）》（GB15097-2016）.
But ship tail gas Study on treatment technology present situation：Foreign countries' monopolization, domestic blank.The mark administered by domestic ship tail gas
It is accurate and backward in technique, to be compared with developed country, GB15097-2016 first stage is suitable with the standard that current Europe is implemented,
The standard that second stage and U.S.'s phase III implement is suitable.
Diesel oil used in diesel engine contains the oily substance of a large amount of high-flashes, causes it to be burnt in cylinder of diesel engine far
Be far from light oil thoroughly, this result in containing a large amount of poisonous and harmful substances in tail gas, include carbon monoxide, sulfur dioxide, nitrogen oxygen
Compound, hydrocarbon, or even also have the material of still unburned microlayer model oils and class pitch.These materials enter rear class
SCR device in, the blocking of the ceramic catalyst in SCR device can be caused, substantially reduce its service life, make price high
Ceramic catalyst failure is scrapped.
In addition, carrying out reaction using ammonia and nitrogen oxides in SCR device removes denitrification, but ammonia due to its from
The unstability of body, cause potential safety hazard be present during use.
Utility model content
A purpose of the present utility model is to provide for one kind and is used for marine diesel engine（Power is more than 37kw）Tail gas
Cleaning system, it is not only able to make diesel engine vent gas level reach national GB15097-2016《Engine of boat and ship exhaust contaminant is arranged
Put limit value and measuring method》Second stage emission level, additionally it is possible to ensure the security in purification process, and more existing purification system
System reduces purification cost.
Especially, the utility model provides a kind of exhaust gas purification system of marine diesel engine, including sequentially set
Particulate matter filter device and catalysis oxidation/reduction apparatus；
Wherein,
The particulate matter filter device is grain bed, for removing the particulate matter of PM2.5 levels and the above；
Catalysis oxidation/the reduction apparatus is multistage reactor, for removing denitrification, carbon monoxide and hydro carbons.
For above-mentioned technical proposal, inventor also has further optimal enforcement measure.
Preferably, the catalysis oxidation/reduction apparatus includes the SCR reactors for removing denitrification, the SCR reactors
Interior to be provided with catalytic converter and sprayer, the sprayer is used to spray urea liquid into the SCR reactors.
Further, it is provided with NO in the inlet end of the SCR reactorsXSensor, for detecting into SCR reactors
NO in tail gasXContent, the aperture of the sprayer is according to NOXThe detection signal of sensor is adjusted.
Further, the sprayer is material metering sprayer, and ECU is also included in the SCR reactors, described
NOXThe detection signal of sensor delivers to ECU, and the ECU sends control signal again, controls the material metering sprayer
The urea liquid amount sprayed.
Preferably, the catalysis oxidation/reduction apparatus also includes the secondary reactor for removing carbon monoxide and hydro carbons, described
The inlet end of secondary reactor is connected with the outlet side of the SCR reactors.
Further, the secondary reactor includes the spherical catalytic carrier being arranged in closing housing, described spherical to urge
It is to form nano-scale coating by nano level Pt, Pa precious metal surface to change carrier, and coating layer thickness is between 50-200nm.
Further, the spherical catalytic carrier is honeycomb catalyst carrier.
Exhaust gas purification system of the present utility model, by urea liquid directly through pipelined to catalysis oxidation/reduction apparatus
In SCR reactors in so that urea liquid is sufficiently mixed with high-temperature tail gas, so as to produce gaseous ammonia, thus need not
The conventional gaseous ammonia generating means of prior art, instead of in selective catalytic reduction by ammonia evaporator, ammonia surge tank,
The gaseous ammonia generating means of the huge equipment composition such as gas flow valve, this comes for most of for mobile pollution source diesel engine
Speech, the structure of exhaust gas purification system provided by the utility model is simple, small volume, in light weight, more for practicality.In addition,
Secondary reactor is also add, carrying out effective catalysis to carbon monoxide and hydro carbons reduces, and reaches the purpose reliably purified.
Further, the utility model has the NO of the amount of nitrogen oxides in detection high-temperature tail gasXSensor, the urine
The emitted dose of plain solution is that the amount of nitrogen oxides in the high-temperature tail gas according to the exhaust gas purification system carries out intelligent control,
While ensureing efficiently to take out nitrogen oxides, additionally it is possible to avoid the occurrence of the escaping of ammonia, saved cost, and avoid two
Secondary environment pollutes.
According to the accompanying drawings will be more to the detailed description of the utility model specific embodiment, those skilled in the art
Add clear of the present utility model above-mentioned and other purposes, advantages and features.
Brief description of the drawings
It is described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter more of the present utility model specific real
Apply example.Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that
What these accompanying drawings were not necessarily drawn to scale.In accompanying drawing：
Fig. 1 is the structure principle chart according to the exhaust gas purification system of the utility model one embodiment.
Wherein：
1st, particulate matter filter device；2nd, SCR reactors；3rd, secondary reactor；4th, sprayer；5、NOXSensor；6th, it is automatically controlled
Unit.
Embodiment
Fig. 1 is the structure principle chart according to the exhaust gas purification system of the utility model one embodiment.
As shown in figure 1, the exhaust gas purification system of the marine diesel engine described by the present embodiment, can include in general manner
The particulate matter filter device 1 sequentially set and catalysis oxidation/reduction apparatus；Wherein, the particulate matter filter device 1 is particle
Bed, for removing the particulate matter of PM2.5 levels and the above；Catalysis oxidation/the reduction apparatus is multistage reactor, for going to denitrogenate
Oxide, carbon monoxide and hydro carbons.
Multistage reactor can remove denitrification and carbon monoxide and hydro carbons successively, react more abundant, clean-up effect
More preferably, the purpose reliably purified can be reached.
Preferably, the catalysis oxidation/reduction apparatus includes the SCR reactors 2 for removing denitrification, the SCR reactions
Catalytic converter and sprayer 4 are provided with device 2, the sprayer 4 is used to spray urea liquid into the SCR reactors 2.
Pipeline is provided with the SCR reactors 2, by the urea liquid through pipelined to sprayer 4, hence into
The inside of the SCR reactors 2, urea liquid is changed into by microlayer model state by air-stream spraying and fully mixed with high-temperature tail gas
Close, the urea in urea liquid in the presence of high-temperature tail gas is heated to rapidly more than 160 DEG C and then decomposed, and produces gaseous ammonia
（NH3）And biuret（CONH）, wherein gaseous ammonia（NH3）By under catalytic condition with the nitrogen oxides in tail gas（Including NO and
NO2）The following chemical reaction of generation：
4NH3+4NO+O2=4N2+6H2O
8NH3+6NO2 =7N2+12H2O
While above-mentioned denitration process, under high temperature and catalytic condition, carbon monoxide and nitrogen oxygen in tail gas gaseous mixture
Compound（Including NO and NO2）The following chemical reaction of generation：
2CO+2NO+O2=2CO2 + N2
4CO+2NO2=4CO2 + N2
The catalysis reduction for so realizing nitrogen oxides removes, while also removes substantial amounts of carbon monoxide, tail gas clean-up
Positive effect.
It is understood that the content into the nitrogen oxides of exhaust purifier is the moment in change, because diesel engine
Operation conditions it is different, caused nitrogen oxides is also inevitable different, then purifies these major pollutants i.e. nitrogen
It is gaseous ammonia and different needed for oxide.For this case, inlet end of the inventor in the SCR reactors 2
It is exactly that the place that tail gas is discharged into is provided with NOXSensor 5, for NO in detecting into the tail gas of SCR reactors 2XContent, it is described
The aperture of sprayer 4 is according to NOXThe detection signal of sensor 5 is adjusted.
, just must be according to diesel engine condition in order to avoid urea liquid emitted dose deficiency or urea liquid overspray（Turn
Speed and the difference of load cause the nitrous oxides concentration difference contained in the flow difference of tail gas, its tail gas）Change, change immediately
Become the urea liquid overspray into exhaust gas cleaner, because injection rate of the gaseous ammonia in tail gas depends entirely on urea
The concentration and injection rate of solution, and urea concentration controls very well, as long as urea liquid emitted dose can be adjusted accurately.
Further, the sprayer 4 is used into material metering sprayer 4, with reference to urea concentration, by electric in the SCR reactors 2
Control unit 6 carries out automatically controlled spraying.In the NOXAfter the detection signal of sensor 5 delivers to ECU 6, information processing is carried out, so
The ECU 6 sends control signal again afterwards, the urea liquid amount for controlling the material metering sprayer 4 to be sprayed.
A certain amount of carbon monoxide has above been eliminated in SCR reactors 2, but may also have residual, therefore can
The secondary reactor 3 for removing carbon monoxide and hydro carbons, the secondary reactor are set again in the catalysis oxidation/reduction apparatus
3 inlet end is connected with the outlet side of the SCR reactors 2, that is, is arranged on the rear end of SCR reactors 2.
Further, the secondary reactor 3 includes the spherical catalytic carrier being arranged in closing housing, described spherical to urge
It is to form nano-scale coating by nano level Pt, Pa precious metal surface to change carrier, and coating layer thickness is between 50-200nm, the ball
Shape catalytic carrier is honeycomb catalyst carrier.It is cellular be not only able to so that tail gas finally exclude it is smooth, and with bigger
Haptoreaction area, reaction are more abundant.
To sum up, the exhaust gas purification system of the present embodiment, by urea liquid directly through pipelined to catalysis oxidation/also original-pack
In the SCR reactors 2 put so that urea liquid is sufficiently mixed with high-temperature tail gas, so as to produce gaseous ammonia and biuret,
Thus without prior art commonly use gaseous ammonia generating means, instead of in selective catalytic reduction by ammonia evaporator,
The gaseous ammonia generating means of the huge equipment composition such as ammonia surge tank, gas flow valve, this is for most of for mobile pollution
Source diesel engine says, the structure of exhaust gas purification system provided by the utility model is simple, small volume, in light weight, more standby real
The property used.In addition, also add secondary reactor 3, carrying out effective catalysis to carbon monoxide and hydro carbons reduces, and reaches reliable purification
Purpose.
Moreover, the utility model has the NO of the amount of nitrogen oxides in detection high-temperature tail gasXSensor 5, the urea
The emitted dose of solution is that the amount of nitrogen oxides in the high-temperature tail gas according to the exhaust gas purification system carries out intelligent control,
While ensureing efficiently to take out nitrogen oxides, additionally it is possible to avoid the occurrence of the escaping of ammonia, saved cost, and avoid environment
Pollution.
So far, although those skilled in the art will appreciate that herein it is detailed have shown and described it is of the present utility model more
Individual exemplary embodiment, still, still can be public according to the utility model in the case where not departing from the spirit and scope of the utility model
The content opened directly determines or derived many other variations or modifications for meeting the utility model principle.Therefore, this practicality is new
The scope of type is understood that and regarded as to cover other all these variations or modifications.
Claims (7)
1. a kind of exhaust gas purification system of marine diesel engine, including the particulate matter filter device sequentially set and catalysis oxidation/
Reduction apparatus；
Wherein,
The particulate matter filter device is grain bed, for removing the particulate matter of PM2.5 levels and the above；
Catalysis oxidation/the reduction apparatus is multistage reactor, for removing denitrification, carbon monoxide and hydro carbons.
2. exhaust gas purification system according to claim 1, it is characterised in that the catalysis oxidation/reduction apparatus includes going
The SCR reactors of denitrification, are provided with catalytic converter and sprayer in the SCR reactors, the sprayer for
Injection urea liquid in the SCR reactors.
3. exhaust gas purification system according to claim 2, it is characterised in that be provided with the inlet end of the SCR reactors
NOXSensor, for NO in detecting into the tail gas of SCR reactorsXContent, the aperture of the sprayer is according to NOXSensor
Detection signal be adjusted.
4. exhaust gas purification system according to claim 3, it is characterised in that the sprayer is material metering sprayer, described
Also include ECU, the NO in SCR reactorsXThe detection signal of sensor delivers to ECU, and the ECU is again
Control signal is sent, the urea liquid amount for controlling the material metering sprayer to be sprayed.
5. exhaust gas purification system according to claim 2, it is characterised in that the catalysis oxidation/reduction apparatus also includes
Remove the secondary reactor of carbon monoxide and hydro carbons, the outlet side of the inlet end of the secondary reactor and the SCR reactors
It is connected.
6. exhaust gas purification system according to claim 5, it is characterised in that the secondary reactor includes being arranged on closing
Spherical catalytic carrier in housing, the spherical catalytic carrier are to form nanoscale by nano level Pt, Pa precious metal surface to apply
Layer, coating layer thickness is between 50-200nm.
7. exhaust gas purification system according to claim 6, it is characterised in that the spherical catalytic carrier is honeycomb catalyst
Carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720780942.5U CN206845280U (en) | 2017-06-30 | 2017-06-30 | A kind of exhaust gas purification system of marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720780942.5U CN206845280U (en) | 2017-06-30 | 2017-06-30 | A kind of exhaust gas purification system of marine diesel engine |
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| CN206845280U true CN206845280U (en) | 2018-01-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026303A (en) * | 2018-07-24 | 2018-12-18 | 苏州水木康桥环境工程技术有限公司 | A kind of preparation method of oxidized form catalysed particulate bed filter device and its catalysis oxidation particle |
| CN112664298A (en) * | 2020-06-16 | 2021-04-16 | 长城汽车股份有限公司 | Exhaust gas purification system for vehicle and exhaust gas purification method for vehicle |
| CN112930434A (en) * | 2018-10-22 | 2021-06-08 | 上海必修福企业管理有限公司 | Engine tail gas ozone purification system and method |
-
2017
- 2017-06-30 CN CN201720780942.5U patent/CN206845280U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026303A (en) * | 2018-07-24 | 2018-12-18 | 苏州水木康桥环境工程技术有限公司 | A kind of preparation method of oxidized form catalysed particulate bed filter device and its catalysis oxidation particle |
| CN112930434A (en) * | 2018-10-22 | 2021-06-08 | 上海必修福企业管理有限公司 | Engine tail gas ozone purification system and method |
| CN112930434B (en) * | 2018-10-22 | 2023-08-15 | 上海必修福企业管理有限公司 | Engine tail gas ozone purification system and method |
| CN112664298A (en) * | 2020-06-16 | 2021-04-16 | 长城汽车股份有限公司 | Exhaust gas purification system for vehicle and exhaust gas purification method for vehicle |
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