CN109973187A - Marine diesel post-processes control method and control device - Google Patents
Marine diesel post-processes control method and control device Download PDFInfo
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- CN109973187A CN109973187A CN201910245997.XA CN201910245997A CN109973187A CN 109973187 A CN109973187 A CN 109973187A CN 201910245997 A CN201910245997 A CN 201910245997A CN 109973187 A CN109973187 A CN 109973187A
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- urea
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- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
- F01N2590/021—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications for outboard engines
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to rear diesel engine after treatment fields, and in particular to a kind of marine diesel post-processing control method and control device.The control method includes: that engine emission nitrogen oxide mass flow is calculated；Calculate the catalyst transformation efficiency that catalytic reduction reaction occurs inside catalytic reduction device SCR；According to the nitrogen oxide mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, urea is calculated and always sprays demand；Statistics is capable of the number of the urea ejection end of normal use；The number always sprayed demand according to the urea and be capable of the urea ejection end of normal use calculates the urea injecting quantity for distributing to each urea ejection end；Pressure-air is sprayed into catalytic reduction device SCR with the jet end of fixed interval control soot blowing component.The control device includes original machine nitrogen oxides computing module, catalyst transformation efficiency computing module, urea always sprays demand computing module, urea sprays Coordination module and soot-blowing control device.
Description
Technical field
The present invention relates to rear diesel engine after treatment fields, and in particular to a kind of marine diesel post-processing control method and control
Device processed.
Background technique
As the day of Global emissions regulation is increasingly tight, the emission control for marine diesel is also included into discharge supervision
In.Currently, river valley and the ship of sea frontier zone traveling need to install exhaust gas purification system in US and European, meet various regions regulation
It is required that.IMO harpoon has also put into effect relevant laws and regulations to water craft exhaust of the navigation on high sea, to the ship diesel engine of different displacements
Exhaust emissions has made corresponding requirements, and the marine diesel for being unsatisfactory for laws and regulations requirement can also be required to install exhaust gas purification system.In
With the reinforcement of environmental protection supervision, the discharge of internal river valley ship is also brought into regulation monitoring, and implements ship step by step for state
Exhausting control.
Currently, the emission control of marine diesel is mainly the nitrogen oxides reduced in diesel engine.Diesel engine reduces nitrogen oxygen
The main path of compound is to spray urea using SCR system to realize.It is different from diesel engine for automobile SCR system, after SCR peculiar to vessel
System-operating environment, condition difference are managed, needs to carry out the exploitation of SCR system specifically for marine diesel.Due to marine diesel oil
Machine burning is middle heavy oil, and sulfur content is relatively high, needs SCR catalyst resistant to sulfur ability stronger, and regular deashing is needed to prevent ash
Divide blocking SCR carrier；In addition, since marine diesel discharge capacity is bigger, it is therefore desirable to which the amount of injection of SCR system is bigger；Together
When ship machine SCR system is required harsh, need standby system and guarantee system normal use.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provide a kind of marine diesel post-processing control method and
Control device, the marine diesel post-processing control method and control device can satisfy marine diesel and reduce nitrogen oxides
Emissions requirements.
The technical solution provided according to the present invention, as the first aspect of the present invention, after a kind of marine diesel is provided
Control method is managed, the marine diesel post-processing control method includes:
S100: engine emission nitrogen oxide mass flow is calculated；
S200: the catalyst transformation efficiency that catalytic reduction reaction occurs inside catalytic reduction device SCR is calculated；
S300: it according to the nitrogen oxide mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, calculates
It obtains urea and always sprays demand；
S400: statistics is capable of the number of the urea ejection end of normal use；
S500: it is distributed to often according to the number calculating that the urea always sprays demand and the urea ejection end for capableing of normal use
The urea injecting quantity of a urea ejection end；
S600: pressure-air is sprayed into catalytic reduction device SCR with the jet end of fixed interval control soot blowing component.
Further, the S400 is specifically included:
S410: the status information of each urea ejection end is acquired；
S420: judge whether the state of each urea ejection end being capable of normal use；
S430: statistics is capable of the number of the urea ejection end of normal use, and stops sending injection life to failure urea ejection end
It enables.
The S500 is specifically included:
S510: it should be distributed according to the number calculating that the urea always sprays demand and the urea ejection end for capableing of normal use
To the urea injecting quantity for the urea ejection end for capableing of normal use；
S520: it is updated to the urea ejection end for capableing of normal use and sends the amount of injection order and alarm.
Further, the S600 is specifically included:
S610: the signal at the time of operation timing signal and last time soot blowing nozzle driving signal for acquiring engine stop；
S620: the time signal stopped according to the operation timing signal of engine and last time soot blowing nozzle driving signal, calculate away from
Engine operation duration when stopping from last time soot blowing；
S630: engine operation duration when stopping apart from last time soot blowing is compared with maximum blowing time interval；
S640: if engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval, judge that engine is run
Whether operating condition meets soot blowing condition；
S650: it if engine operation condition meets soot blowing condition, sends soot blowing driving signal control soot blowing component and catalysis is restored
Device SCR cavity carries out soot blowing operation；
S660: the blowing time of progress stops soot blowing after reaching setting time.
Further, the S640 is specifically included: S641: the engine operation duration when stopping apart from last time soot blowing is big
When blowing time interval, the rotary speed information and circulating fuel injection quantity of engine are acquired, according to the rotary speed information and circulation of engine
Distributive value judges the work information of present engine；S642: judge whether present engine operating condition meets soot blowing condition.
As a second aspect of the invention, a kind of marine diesel post-processing control device is provided, after the diesel engine
Managing control device includes:
Original machine nitrogen oxides computing module, the original machine nitrogen oxides computing module is for being calculated engine emission nitrogen oxidation
Amount of substance flow；
Catalyst transformation efficiency computing module, the catalyst transformation efficiency computing module is for calculating catalytic reduction device SCR
The catalyst transformation efficiency of catalytic reduction reaction occurs for inside；
Urea always sprays demand computing module, and the urea always sprays demand computing module for according to the nitrogen oxides
Mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, are calculated urea and always spray demand；
Urea sprays Coordination module, and the urea injection Coordination module is used to count the number for the ejection end for capableing of normal use,
And each ejection end is distributed to according to the number calculating that the urea always sprays demand and the ejection end for capableing of normal use
Urea injecting quantity；
Soot-blowing control device, it is described for the jet end of fixed interval control soot blowing component to catalytic reduction device SCR
Middle penetrating pressure-air.
Further, the urea injection Coordination module includes:
Urea ejection end state acquisition unit, the urea ejection end state acquisition unit is for acquiring each urea ejection end
Status information；
Urea ejection end state judging unit, the urea ejection end state judging unit is for judging each urea ejection end
Whether state being capable of normal use；
Urea ejection end statistic unit, the urea ejection end statistic unit is for counting the urine for capableing of normal use
The number of plain ejection end；
Urea injecting quantity computing unit, the urea injecting quantity computing unit are used to always spray demand and energy according to the urea
The number of the ejection end of enough normal uses calculates the urea injecting quantity for distributing to the ejection end for capableing of normal use；
Urea jeting instruction transmission unit, the urea jeting instruction transmission unit is based on according to urea injecting quantity computing unit
The state letter of each urea ejection end of urea injecting quantity and urea ejection end state acquisition the unit acquisition of the ejection end of calculation
Breath sends command signal to each urea ejection end.
Further, the soot-blowing control device includes:
Blowing time signal acquisition unit, the blowing time signal acquisition unit are used to acquire the operation timing signal of engine
The time signal stopped with last time soot blowing nozzle driving signal；
Blowing time interval calculation unit, the blowing time interval calculation unit are used for according to blowing time signal acquisition unit
Acquisition, the time signal that the operation timing signal and last time soot blowing nozzle driving signal of engine stop was calculated apart from last time
Engine operation duration when soot blowing stops；The operation timing signal and last time soot blowing nozzle driving signal of engine stop when
Between signal, calculate apart from last time soot blowing stop when engine operation duration；
Blowing time interval comparing unit is preset with maximum blowing time interval in the comparing unit of the blowing time interval, will
The engine operation duration and the maximum soot blowing when stopping apart from last time soot blowing calculated in blowing time interval calculation unit
Time interval is compared；
Soot blowing condition coordination unit, the soot blowing condition coordination unit are blown for judging whether present engine operating condition meets
Grey condition；
Soot blowing instruction sending unit, the soot blowing instruction sending unit is for sending soot blowing driving signal, control soot blowing instruction hair
Send unit.
Further, the soot blowing condition coordination unit includes:
Soot blowing condition acquires subelement, and the soot blowing condition acquisition subelement is used to acquire rotary speed information and the circulation spray of engine
Oil mass；
Soot blowing condition judgment sub-unit, the soot blowing condition judgment sub-unit are used to acquire subelement acquisition according to soot blowing condition
Rotary speed information and circulating fuel injection quantity, judge the work information of present engine, and judge whether present engine operating condition accords with
Close soot blowing condition.
From the above as can be seen that marine diesel provided by the invention post-processes control method and control device, with
The prior art, which is compared, has following advantages: the fuel oil used due to marine diesel is mainly based on middle heavy oil, meeting after burning
A large amount of dissolved organic matter and inorganic salts are generated, with the accumulation of time, dissolved organic matter and inorganic salts can be deposited in and urge
Change in reduction apparatus SCR, not only result in catalytic reduction device SCR blocking, so that back pressure is caused to rise, oil consumption increases；Can also
So that catalytic reduction device SCR conversion efficiency declines, discharge exceeded；By into catalytic reduction device SCR cavity in the present invention
Pressure-air is periodically sprayed into, catalytic reduction device SCR cavity is able to carry out and is purged, be deposited on catalytic reduction device for some
Ash content on SCR carrier is blown off, restores SCR conversion efficiency.
Detailed description of the invention
Fig. 1 is the flow chart of first aspect present invention.
Fig. 2 is the specific flow chart of S400 in first aspect present invention.
Fig. 3 is the specific flow chart of S500 in first aspect present invention.
Fig. 4 is the specific flow chart of S600 in first aspect present invention.
Fig. 5 is the specific flow chart of S640 in first aspect present invention.
Fig. 6 is the structural schematic diagram of second aspect of the present invention.
100. original machine nitrogen oxides computing module, 200. catalyst transformation efficiency computing modules, 300. urea always spray
Demand computing module, 400. urea spray Coordination module, 410. urea ejection end state acquisition units, the spray of 420. urea
Penetrate end state judging unit, 430. urea ejection end statistic units, 440. urea injecting quantity computing units, 450. urine
Plain jeting instruction transmission unit, 500. soot-blowing control devices, 510. blowing time signal acquisition units, 520. blowing times
Interval calculation unit, 530. blowing time interval comparing units, 540. soot blowing condition coordination units, 541. soot blowing conditions are adopted
Collect subelement, 542. soot blowing condition judgment sub-units, 550. soot blowing instruction sending units.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
As a second aspect of the invention, a kind of marine diesel post-processing control method is improved, as shown in Figure 1, described
Marine diesel post-process control method specifically includes the following steps:
S100: acquiring the rotary speed information and circulating fuel injection quantity of engine, according to the rotary speed information of the engine and circulation oil spout
Amount the first MAP chart of inquiry, obtains engine emission nitrogen oxide mass flow；First MAP chart is counted by test of many times
And the Figure of the quantitative relationship come, it can indicate the rotary speed information, circulating fuel injection quantity and engine emission nitrogen oxidation substance of engine
Measure the quantitative relation between flow.
S200: the exhaust mass flow of mean temperature and engine inside acquisition catalytic reduction device SCR, according to described
The exhaust mass flow of mean temperature and engine inside catalytic reduction device SCR inquires the second MAP chart, obtains catalysis reduction
The catalyst transformation efficiency of catalytic reduction reaction occurs inside device SCR；Second MAP chart is from test of many times statistics
Figure of the quantitative relationship, can indicate mean temperature inside catalytic reduction device SCR, engine exhaust mass flow and
The quantitative relation between the catalyst transformation efficiency of catalytic reduction reaction occurs inside SCR.
S300: the urea level information and temperature information of urea storage stored in containers are obtained；According to the urea level
It is calculated in the engine emission nitrogen oxide mass flow and S200 being calculated in information and temperature information and S100
Catalytic reduction device SCR internal accelerator transformation efficiency inquires third MAP chart, obtains urea and always sprays demand；The third
MAP chart is the Figure of the quantitative relationship from test of many times statistics, can indicate engine emission nitrogen oxide mass flow, urge
Agent transformation efficiency and urea always spray the quantitative relation between demand.
S400: the fault message of the acquisition each urea ejection end urea ejection end of urea ejection end, statistics can normally make
The number of ejection end；
S500: the ejection end for capableing of normal use of demand and S400 statistics is always sprayed according to the urea being calculated in S300
Number calculate and distribute to the urea injecting quantity of each ejection end.
S600: high pressure sky is sprayed into catalytic reduction device SCR with the jet end of fixed interval control soot blowing component
Gas.
It is understood that the fuel oil used due to marine diesel mainly based on middle heavy oil, can generate after burning
A large amount of dissolved organic matter and inorganic salts, with the accumulation of time, dissolved organic matter and inorganic salts can be deposited in catalysis also
In original device SCR, catalytic reduction device SCR blocking is not only resulted in, so that back pressure is caused to rise, oil consumption increases；Can also it make
The decline of catalytic reduction device SCR conversion efficiency, is discharged exceeded；By regular into catalytic reduction device SCR cavity in the present invention
Pressure-air is sprayed into, catalytic reduction device SCR cavity is able to carry out and is purged, be deposited on catalytic reduction device SCR for some
Ash content on carrier is blown off, restores SCR conversion efficiency.
As shown in Fig. 2, S400: the fault message of the acquisition each urea ejection end urea ejection end of urea ejection end, statistics
It is capable of the number of the ejection end of normal use, specifically includes:
S410: the status information of each urea ejection end is acquired；
S420: judge whether the state of each urea ejection end being capable of normal use；
S430: statistics is capable of the number of the urea ejection end of normal use, and stops sending injection life to failure urea ejection end
It enables.
As shown in figure 3, the S500 is specifically included:
S510: always spraying demand according to the urea and is capable of the number calculating of the ejection end of normal use distribute to can be just
The urea injecting quantity for the ejection end being often used；
S520: it updates the amount of injection order sent to the urea ejection end for capableing of normal use and alarms.
It is understood that consider the use condition of ship machine after-treatment system simultaneously for failure, when design, needs to carry out
Redundancy Design is counted using the status information for acquiring each urea ejection end according to the status information of each urea ejection end again
The urea injecting quantity of each urea ejection end of point counting dispensing can guarantee to break down even if wherein 1 ~ 2 urea pump, will be total
Urea injecting quantity, which is distributed to other urea pumps, still can satisfy total the amount of injection demand.
As shown in figure 4, the S600 is specifically included:
S610: the time signal that the operation timing signal and last time soot blowing nozzle driving signal for acquiring engine stop；
S620: the time signal stopped according to the operation timing signal of engine and last time soot blowing nozzle driving signal, calculate away from
Engine operation duration when stopping from last time soot blowing；
S630: engine operation duration when stopping apart from last time soot blowing is compared with maximum blowing time interval；
S640: if engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval, judge that engine is run
Whether operating condition meets soot blowing condition；
S650: it if engine operation condition meets soot blowing condition, sends soot blowing driving signal control soot blowing component and catalysis is restored
Device SCR cavity carries out soot blowing operation；
S660: the blowing time of progress stops soot blowing after reaching setting time.
As shown in figure 5, S640: if engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval,
Judge whether engine operation condition meets soot blowing condition, specifically include:
S641: when the engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval, engine is acquired
Rotary speed information and circulating fuel injection quantity judge that the operating condition of present engine is believed according to the rotary speed information of engine and circulating fuel injection quantity
Breath；S642: judge whether present engine operating condition meets soot blowing condition.
As a second aspect of the invention, a kind of marine diesel post-processing control device is provided, as shown in fig. 6, described
Marine diesel post-processes control device
Original machine nitrogen oxides computing module 100, the original machine nitrogen oxides computing module 100 is for being calculated engine emission
Nitrogen oxide mass flow；
Catalyst transformation efficiency computing module 200, the catalyst transformation efficiency computing module 200 are also original-pack for calculating catalysis
Set the catalyst transformation efficiency that catalytic reduction reaction occurs inside SCR；
Urea always sprays demand computing module 300, and the urea always sprays demand computing module 300 for according to the nitrogen
Oxide mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, are calculated urea and always spray demand
Amount；
Urea sprays Coordination module 400, and the urea injection Coordination module 400 is used to count the urea for capableing of normal use injection
The number at end, and should be divided according to the number calculating that the urea always sprays demand and the urea ejection end for capableing of normal use
The urea injecting quantity of each urea ejection end of dispensing；
Soot-blowing control device 500, it is described for the jet end of fixed interval control soot blowing component to catalytic reduction device
Pressure-air is sprayed into SCR.
It is understood that the fuel oil used due to marine diesel mainly based on middle heavy oil, can generate after burning
A large amount of dissolved organic matter and inorganic salts, with the accumulation of time, dissolved organic matter and inorganic salts can be deposited in catalysis also
In original device SCR, catalytic reduction device SCR blocking is not only resulted in, so that back pressure is caused to rise, oil consumption increases；Can also it make
The decline of catalytic reduction device SCR conversion efficiency, is discharged exceeded；By regular into catalytic reduction device SCR cavity in the present invention
Pressure-air is sprayed into, catalytic reduction device SCR cavity is able to carry out and is purged, be deposited on catalytic reduction device SCR for some
Ash content on carrier is blown off, restores SCR conversion efficiency.
The urea sprays Coordination module 400
Urea ejection end state acquisition unit 410, the urea ejection end state acquisition unit 410 is for acquiring each urea spray
Penetrate the status information at end；
Urea ejection end state judging unit 420, the urea ejection end state judging unit 420 is for judging each urea spray
Whether the state for penetrating end being capable of normal use；
Urea ejection end statistic unit 430, the urea ejection end statistic unit 430 can normally make for counting
The number of urea ejection end；
Urea injecting quantity computing unit 440, the urea injecting quantity computing unit 440 are used to always spray demand according to the urea
The number calculating of amount and the urea ejection end for capableing of normal use should distribute to each urea ejection end for capableing of normal use
Urea injecting quantity；
Urea jeting instruction transmission unit 450, the urea jeting instruction transmission unit 450 according to urea injecting quantity for calculating
The urea injecting quantity and urea ejection end that should distribute to each urea ejection end for capableing of normal use that unit 440 calculates
The status information for each urea ejection end that state acquisition unit 410 acquires sends command signal to each urea ejection end.
It is understood that for considering the use condition of ship machine after-treatment system simultaneously, when design, needs to carry out redundancy
Design is recalculated point according to the status information of each urea ejection end using the status information for acquiring each urea ejection end
The urea injecting quantity of each urea ejection end of dispensing can guarantee to break down even if wherein 1 ~ 2 urea pump, by total urea
The amount of injection, which is distributed to the urea ejection end of other energy normal uses, still can satisfy total the amount of injection demand.
The soot-blowing control device 500 includes:
Blowing time signal acquisition unit 510, when the blowing time signal acquisition unit 510 is used to acquire the operation of engine
Between signal and last time soot blowing nozzle driving signal signal at the time of stop；
Blowing time interval calculation unit 520, the blowing time interval calculation unit 520 according to blowing time signal for adopting
The time signal that the operation timing signal and last time soot blowing nozzle driving signal for collecting the engine that unit 510 acquires stop, calculating
Engine operation duration when stopping apart from last time soot blowing；The operation timing signal and last time soot blowing nozzle driving signal of engine
Signal at the time of stopping calculates engine operation duration when stopping apart from last time soot blowing；
Blowing time interval comparing unit 530 is preset between maximum blowing time in blowing time interval comparing unit 530
Every, will calculate in blowing time interval calculation unit 520 engine operation duration when stopping apart from last time soot blowing with it is described
Maximum blowing time interval is compared；
Soot blowing condition coordination unit 540, whether the soot blowing condition coordination unit 540 is for judging present engine operating condition
Meet soot blowing condition；
Soot blowing instruction sending unit 550, the soot blowing instruction sending unit 550 control soot blowing for sending soot blowing driving signal
Instruction sending unit 550.
The soot blowing condition coordination unit 540 includes:
Soot blowing condition acquires subelement 541, soot blowing condition acquisition subelement 541 be used to acquire engine rotary speed information and
Circulating fuel injection quantity；
Soot blowing condition judgment sub-unit 542, the soot blowing condition judgment sub-unit 542 are used to acquire subelement according to soot blowing condition
The rotary speed information and circulating fuel injection quantity of 541 acquisitions, judge the work information of present engine, and judge that present engine runs work
Whether condition meets soot blowing condition.
It should be understood by those ordinary skilled in the art that: the above is only a specific embodiment of the present invention, and
It is not used in the limitation present invention, all any modification, equivalent substitution, improvement and etc. within purport of the invention, done should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of marine diesel post-processes control method, which is characterized in that the marine diesel post-processes control method packet
It includes:
S100: engine emission nitrogen oxide mass flow is calculated；
S200: the catalyst transformation efficiency that catalytic reduction reaction occurs inside catalytic reduction device SCR is calculated；
S300: it according to the nitrogen oxide mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, calculates
It obtains urea and always sprays demand；
S400: statistics is capable of the number of the urea ejection end of normal use；
S500: it is distributed to often according to the number calculating that the urea always sprays demand and the urea ejection end for capableing of normal use
The urea injecting quantity of a urea ejection end；
S600: pressure-air is sprayed into catalytic reduction device SCR with the jet end of fixed interval control soot blowing component.
2. marine diesel as described in claim 1 post-processes control method, which is characterized in that the S400 is specifically included:
S410: the status information of each urea ejection end is acquired；
S420: judge whether the state of each urea ejection end being capable of normal use；
S430: statistics is capable of the number of the urea ejection end of normal use, and stops sending injection life to failure urea ejection end
It enables；
The S500 is specifically included:
S510: it should be distributed according to the number calculating that the urea always sprays demand and the urea ejection end for capableing of normal use
To the urea injecting quantity for the urea ejection end for capableing of normal use；
S520: it is updated to the urea ejection end for capableing of normal use and sends the amount of injection order and alarm.
3. marine diesel as described in claim 1 post-processes control method, which is characterized in that the S600 is specifically included:
S610: the signal at the time of operation timing signal and last time soot blowing nozzle driving signal for acquiring engine stop；
S620: the time signal stopped according to the operation timing signal of engine and last time soot blowing nozzle driving signal, calculate away from
Engine operation duration when stopping from last time soot blowing；
S630: engine operation duration when stopping apart from last time soot blowing is compared with maximum blowing time interval；
S640: if engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval, judge that engine is run
Whether operating condition meets soot blowing condition；
S650: it if engine operation condition meets soot blowing condition, sends soot blowing driving signal control soot blowing component and catalysis is restored
Device SCR cavity carries out soot blowing operation；
S660: the blowing time of progress stops soot blowing after reaching setting time.
4. marine diesel as claimed in claim 3 post-processes control method, which is characterized in that the S640 is specifically included:
S641: when the engine operation duration when stopping apart from last time soot blowing is greater than blowing time interval, the revolving speed of engine is acquired
Information and circulating fuel injection quantity judge the work information of present engine according to the rotary speed information of engine and circulating fuel injection quantity；
S642: judge whether present engine operating condition meets soot blowing condition.
5. a kind of marine diesel post-processes control device, which is characterized in that the diesel engine after treatment control device includes:
Original machine nitrogen oxides computing module, the original machine nitrogen oxides computing module is for being calculated engine emission nitrogen oxidation
Amount of substance flow；
Catalyst transformation efficiency computing module, the catalyst transformation efficiency computing module is for calculating catalytic reduction device SCR
The catalyst transformation efficiency of catalytic reduction reaction occurs for inside；
Urea always sprays demand computing module, and the urea always sprays demand computing module for according to the nitrogen oxides
Mass flow and the catalytic reduction device SCR internal accelerator transformation efficiency, are calculated urea and always spray demand；
Urea sprays Coordination module, and the urea injection Coordination module is used to count for the urea ejection end for capableing of normal use
Number, and each ejection end is distributed to according to the number calculating that the urea always sprays demand and the ejection end for capableing of normal use
Urea injecting quantity；
Soot-blowing control device, it is described for the jet end of fixed interval control soot blowing component to catalytic reduction device SCR
Middle penetrating pressure-air.
6. marine diesel as claimed in claim 5 post-processes control device, which is characterized in that mould is coordinated in the urea injection
Block includes:
Urea ejection end state acquisition unit, the urea ejection end state acquisition unit is for acquiring each urea ejection end
Status information；
Urea ejection end state judging unit, the urea ejection end state judging unit is for judging each urea ejection end
Whether state being capable of normal use；
Urea ejection end statistic unit, the urea ejection end statistic unit is for counting the urine for capableing of normal use
The number of plain ejection end；
Urea injecting quantity computing unit, the urea injecting quantity computing unit are used to always spray demand and energy according to the urea
The number of the ejection end of enough normal uses calculates the urea injecting quantity for distributing to the ejection end for capableing of normal use；
Urea jeting instruction transmission unit, the urea jeting instruction transmission unit is based on according to urea injecting quantity computing unit
The state letter of each urea ejection end of urea injecting quantity and urea ejection end state acquisition the unit acquisition of the ejection end of calculation
Breath sends command signal to each urea ejection end.
7. marine diesel as claimed in claim 5 post-processes control device, which is characterized in that the soot-blowing control device packet
It includes:
Blowing time signal acquisition unit, the blowing time signal acquisition unit are used to acquire the operation timing signal of engine
The time signal stopped with last time soot blowing nozzle driving signal；
Blowing time interval calculation unit, the blowing time interval calculation unit are used for according to blowing time signal acquisition unit
Acquisition, the time signal that the operation timing signal and last time soot blowing nozzle driving signal of engine stop was calculated apart from last time
Engine operation duration when soot blowing stops；The operation timing signal and last time soot blowing nozzle driving signal of engine stop when
Between signal, calculate apart from last time soot blowing stop when engine operation duration；
Blowing time interval comparing unit is preset with maximum blowing time interval in the comparing unit of the blowing time interval, will
The engine operation duration and the maximum soot blowing when stopping apart from last time soot blowing calculated in blowing time interval calculation unit
Time interval is compared；
Soot blowing condition coordination unit, the soot blowing condition coordination unit are blown for judging whether present engine operating condition meets
Grey condition；
Soot blowing instruction sending unit, the soot blowing instruction sending unit is for sending soot blowing driving signal, control soot blowing instruction hair
Send unit.
8. marine diesel as claimed in claim 7 post-processes control device, which is characterized in that the soot blowing condition is coordinated single
Member includes:
Soot blowing condition acquires subelement, and the soot blowing condition acquisition subelement is used to acquire rotary speed information and the circulation spray of engine
Oil mass；
Soot blowing condition judgment sub-unit, the soot blowing condition judgment sub-unit are used to acquire subelement acquisition according to soot blowing condition
Rotary speed information and circulating fuel injection quantity, judge the work information of present engine, and judge whether present engine operating condition accords with
Close soot blowing condition.
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| CN201910245997.XA CN109973187B (en) | 2019-03-29 | 2019-03-29 | Marine diesel engine aftertreatment control method and control device |
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| CN201910245997.XA CN109973187B (en) | 2019-03-29 | 2019-03-29 | Marine diesel engine aftertreatment control method and control device |
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| CN114151178A (en) * | 2021-12-07 | 2022-03-08 | 中船动力(集团)有限公司 | Reducing agent injection and control method for marine SCR system |
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