CN107035477A - In a kind of low-speed diesel engine matching high pressure SCR system, underload energy recycle device and recovery method - Google Patents
In a kind of low-speed diesel engine matching high pressure SCR system, underload energy recycle device and recovery method Download PDFInfo
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- CN107035477A CN107035477A CN201710332162.9A CN201710332162A CN107035477A CN 107035477 A CN107035477 A CN 107035477A CN 201710332162 A CN201710332162 A CN 201710332162A CN 107035477 A CN107035477 A CN 107035477A
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- scr
- waste gas
- valve group
- diesel engine
- turbocharger
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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]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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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 & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Supercharger (AREA)
Abstract
It is an object of the invention to provide in a kind of low-speed diesel engine matching high pressure SCR system, underload energy recycle device and recovery method, including inlet box, fumer, turbocharger, power turbine, SCR reactors, diesel engine intake mouthful and exhaust outlet are respectively communicated with inlet box and fumer, fumer connects SCR reactors by SCR air inlet pipe, SCR reactors connect SCR escape pipes, evaporation mixer is set in SCR air inlet pipe, SCR escape pipes connect the turbine of turbocharger, power turbine is connected by power pipeline simultaneously, the blower outlet of turbocharger connects inlet box by air cooler, power turbine connects turbine generation group, turbine generation group connects electric storage device and rectification adverser respectively, rectification adverser connects external electrical network.The present invention improves EGT using turbocharger bypass techniques, the requirement for making it meet SCR system, while driving power turbine to generate electricity using this part bypass exhaust, while NOx emission is reduced, reclaims the energy in waste gas.
Description
Technical field
The present invention relates to a kind of diesel emission processing system, specifically low-speed diesel engine SCR system.
Background technology
Ship is the huge means of transport of energy-output ratio, and on the one hand high energy consumption makes the increase of vessel motion cost, the opposing party
Face also brings serious environmental problem to vessel motion.Therefore, how to effectively reduce ship energy consumption and discharge is a weight
The big and problem of reality.
For Exhaust Control for Diesel Engine, emphasis is the discharge for reducing waste gas NOx.At present, SCR technology is International Maritime
Unique NOx abatement technology available for various ships engine and ship type that (IMO) is generally acknowledged is organized, IMO is disclosure satisfy that in theory
Tier III or tightened up discharge standards.According to its work characteristics and arrangement, low-speed diesel engine SCR system can be divided into low
Press SCR system and high pressure SCR system.Comparatively, high pressure SCR system structure is compacter, efficiency utilization rate is higher, more applicable
In the low-speed diesel engine that power is larger.
In high pressure SCR system, if using Low Sulfur Fuel Oil, can further increase operation cost.Start for ship
Machine, usually using high-sulfur residual oil, contains substantial amounts of SOx, if EGT is relatively low, the meeting in high pressure SCR system in waste gas
The NH3 formed in sulfuric acid or sulfurous acid, with high pressure SCR system occurs hair and answered, so as to form sulfate, can block pipeline and catalysis
Agent duct.So waste gas needs have higher temperature when entering high pressure SCR system.
In high pressure SCR system, SCR reactors arrange before the turbine, waste gas from scavenging air box be directly entered blender with
Reducing agent mix, in SCR system complete hair should after enter back into turbocharger, EGT is higher.Under high-load condition,
EGT, which is met, to be required, it is not necessary to modulated；However, in, under low load condition, EGT is usually less than high pressure SCR systems
Operating temperature needed for system is, it is necessary to take main frame to modulate measure to improve EGT.
In the modulation of existing main frame, EGT is generally improved with turbocharger bypass techniques using cylinder bypass.
Cylinder bypass techniques reduce a part of air inlet in scavenging air box, and at the same time, main frame distributive value is constant.Turbocharger bypass techniques exist
Waste gas bypasses a part of waste gas before entering turbocharger, so that the acting ability reduction of compressor, equally reduces air inlet.
Theoretically, two kinds of measures all reduce the air inflow of main frame, and distributive value is constant, are also increased while EGT is improved
The oil consumption of main frame, improves the operation cost of whole system.
Due to the effect of high pressure SCR system, the back pressure of waste gas is changed, and the burning burning to main frame causes certain shadow
Ring, add the oil consumption of system.Meanwhile, modulated in, under low load condition using main frame, further increase oil consumption, increased
The discharge of whole system carbon dioxide is added.Due to the effect of high pressure SCR system, NOx discharge is reduced, but at the same time increase
Oil consumption and the discharge of carbon dioxide are added.Therefore, it can then be dropped in high pressure SCR system if part energy can be recycled
Low a part of oil consumption and the discharge of carbon dioxide, can preferably environmental protection while cutting operating costs.
In heat recovery technology, waste heat of the power turbine commonly used to reclaim waste gas, power turbine can utilize waste gas
Remaining energy generate electricity, and with higher energy recovery efficiency.When high pressure SCR system is run in, under low load condition
When, due to main frame modulation, a part of waste gas has been bypassed in turbocharger, if this portion is directly discharged into environment,
Then the energy in waste gas is not utilized effectively, if this portion is used to driving power turbine to generate electricity, waste gas
In energy can obtain effective recycling, improve the energy utilization efficiency of whole system.
The content of the invention
It is an object of the invention to provide can reclaim the energy in bypass exhaust while effectively reduction NOx, improve
Whole system energy utilization efficiency a kind of low-speed diesel engine matching high pressure SCR system in, underload energy recycle device and
Recovery method.
The object of the present invention is achieved like this：
A kind of low-speed diesel engine of the present invention is matched in high pressure SCR system, underload energy recycle device, it is characterized in that：
Including inlet box, fumer, turbocharger, power turbine, SCR reactors, the air inlet and exhaust outlet of diesel engine connect respectively
Logical inlet box and fumer, fumer connect SCR reactors, SCR reactors connection SCR escape pipes, SCR by SCR air inlet pipe
Evaporation mixer is set in air inlet pipe, and SCR escape pipes connect the turbine of turbocharger, while connecting power by power pipeline
Turbine, the blower outlet of turbocharger connects inlet box, power turbine connection turbine generation group, turbine hair by air cooler
Electricity group connects electric storage device and rectification adverser, rectification adverser connection external electrical network respectively.
A kind of low-speed diesel engine of the present invention is matched in high pressure SCR system, underload energy recycle device can also include：
1st, set in SCR air inlet pipe and the second valve group is set on the first valve group, the SCR escape pipes of SCR reactor exits, moved
3rd valve group is set on solenoid road.
A kind of low-speed diesel engine of the present invention is matched in high pressure SCR system, underload energy reclaiming method, it is characterized in that：
Diesel engine is under high-load condition, opens the first valve group and the second valve group, closes the 3rd valve group, and that is discharged from diesel engine is useless
Gas, into fumer, waste gas enters evaporation mixer from fumer by the first valve group, mixed with reducing agent in evaporation mixer
After conjunction, into SCR reactors, the NOx in waste gas in the presence of catalyst, which is catalyzed, is reduced to nitrogen, and waste gas reacts from SCR
In device out, turbocharger is entered through the second valve group, waste gas is discharged from turbocharger afterwards；
Diesel engine be in, under low load condition, open the first valve group, the second valve group, the 3rd valve group, from diesel engine arrange
The waste gas gone out, into fumer, waste gas out through the first valve group enters evaporation mixer from fumer, in evaporation mixer with
Reducing agent mix, into SCR reactors, the NOx in waste gas in the presence of catalyst, which is catalyzed, is reduced to nitrogen, waste gas from
In SCR reactors out, it is divided into two parts：A part of waste gas enters power turbine by the 3rd valve group and drives power turbine to send out
Electricity, afterwards this portion be discharged into air from power turbine, another part waste gas enters turbocharger, afterwards waste gas from
Air is discharged into turbocharger.
Advantage of the invention is that：The present invention is improved in, under low load condition using turbocharger bypass techniques
EGT, the requirement for making it meet SCR system, while driving power turbine to generate electricity using this part bypass exhaust, in drop
While low NOx drainage, the energy in waste gas, the oil consumption of maximum possible reduction system and the discharge of carbon dioxide, reduction are reclaimed
The influence to environment is reduced while operation cost.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Embodiment
Illustrate below in conjunction with the accompanying drawings and the present invention is described in more detail：
With reference to Fig. 1, the present invention includes main frame 1, high pressure SCR system, exhaust gas bypass driving power turbine electricity generation system,
In, under low load condition, the waste gas first of main frame 1 enter fumer 2, the NOx that waste gas enters in SCR system, waste gas afterwards is in SCR
Nitrogen is reduced to by catalysis in system, waste gas is partly into turbocharger 9 after SCR system reacts, for pressing
Contracting air, is discharged in air afterwards；Another part bypass enter power turbine 8, for driving power turbine 8 to generate electricity, heel row
Into air.
The present invention connected mode and flow be：Waste gas comes out from diesel engine 1, into waste heat box 2, afterwards into high pressure
NOx in SCR system, waste gas is reduced to nitrogen, and whole system is divided into two kinds of working conditions afterwards.1) in high-load condition
Under, waste gas out, fully enters turbocharger 9, for compressed air, is drained into afterwards in air from high pressure SCR system,
Whole process terminates.2) in, under low load condition, a part of bypassed entrance power turbine 8 of waste gas, for driving power whirlpool
Wheel generates electricity, and another part waste gas enters turbocharger, and for compressed air, the mixing of this two parts waste gas, is drained into sky afterwards
In gas, whole process terminates.
Whole system in above-mentioned Fig. 1 is divided into 2 kinds of running statuses in actual moving process.
1) under high-load condition, main frame is not modulated.Now valve group V1 and V2 is opened, and valve group V3 is closed.Waste gas is from diesel oil
Discharged in machine 1, into fumer 2, waste gas enters evaporation mixer 4 from fumer 2 by valve group V1, in evaporation mixer with
Reducing agent mix, into SCR reactors 5, the NOx in waste gas in the presence of catalyst, which is catalyzed, is reduced to nitrogen, waste gas from
In SCR reactors 5 out, turbocharger 9 is entered through valve group V2, for compressed air, waste gas is from turbocharger 9 afterwards
Discharge.
2) in, under low load condition, main frame modulation is carried out using turbocharger bypass.Valve group V1, V2 and V3 are whole
Open.Waste gas is discharged from diesel engine 1, into waste heat box 2, and waste gas out enters from fumer 2 through valve group V1 by valve group V1
Evaporation mixer 4, is mixed in evaporation mixer with reducing agent, into SCR reactors 5, in waste gas in the presence of catalyst
NOx be catalyzed and be reduced to nitrogen, waste gas out, is divided into two parts from SCR reactors 5：A part of waste gas passes through valve group V3
Generated electricity into the driving power turbine of power turbine 8, this portion is discharged into air from power turbine 8 afterwards；Another part
Waste gas enters turbocharger 9 and is used for compressed air, and waste gas is discharged into air from turbocharger 9 afterwards.
Power turbine 8 is connected with generating set 12, and the latter aspect of turbine generation unit generating passes through rectification adverser 14
Effect enter external electrical network 15, the daily power demands on ship；Another reverse side, when aboard ship need for electricity is smaller, whirlpool
Turbine generator group will can be stored electronically in electric storage device 13 accordingly after generating, and supply vessel is carried out when need for electricity is larger
On need for electricity.
Claims (3)
1. a kind of low-speed diesel engine is matched in high pressure SCR system, underload energy recycle device, it is characterized in that：Including air inlet
Case, fumer, turbocharger, power turbine, SCR reactors, the air inlet and exhaust outlet of diesel engine are respectively communicated with inlet box
And fumer, fumer connects SCR reactors, SCR reactors connection SCR escape pipes, in SCR air inlet pipe by SCR air inlet pipe
Evaporation mixer is set, and SCR escape pipes connect the turbine of turbocharger, while connecting power turbine, whirlpool by power pipeline
The blower outlet for taking turns booster connects inlet box, power turbine connection turbine generation group, turbine generation component by air cooler
Lian Jie not electric storage device and rectification adverser, rectification adverser connection external electrical network.
2. a kind of low-speed diesel engine according to claim 1 is matched in high pressure SCR system, underload energy regenerating dress
Put, it is characterized in that：Set in SCR air inlet pipe and the second valve group be set on the first valve group, the SCR escape pipes of SCR reactor exits,
3rd valve group is set on power pipeline.
3. a kind of low-speed diesel engine is matched in high pressure SCR system, underload energy reclaiming method, it is characterized in that：At diesel engine
In under high-load condition, the first valve group and the second valve group are opened, the 3rd valve group is closed, the waste gas discharged from diesel engine enters
Fumer, waste gas enters evaporation mixer from fumer by the first valve group, after being mixed in evaporation mixer with reducing agent, enters
Enter SCR reactors, the NOx in waste gas in the presence of catalyst, which is catalyzed, is reduced to nitrogen, and waste gas goes out from SCR reactors
Come, enter turbocharger through the second valve group, waste gas is discharged from turbocharger afterwards；
Diesel engine be in, under low load condition, open the first valve group, the second valve group, the 3rd valve group, discharged from diesel engine
Waste gas, into fumer, waste gas out enters evaporation mixer from fumer through the first valve group, with reduction in evaporation mixer
Agent is mixed, and into SCR reactors, the NOx in waste gas in the presence of catalyst, which is catalyzed, is reduced to nitrogen, and waste gas is anti-from SCR
Answer in device out, be divided into two parts：A part of waste gas enters power turbine by the 3rd valve group and drives power turbine to generate electricity, afterwards
This portion is discharged into air from power turbine, and another part waste gas enters turbocharger, and waste gas increases from turbine afterwards
Air is discharged into depressor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710332162.9A CN107035477B (en) | 2017-05-12 | 2017-05-12 | Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710332162.9A CN107035477B (en) | 2017-05-12 | 2017-05-12 | Medium-load and low-load energy recovery device and method for low-speed diesel engine matched with high-pressure SCR system |
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| CN107035477A true CN107035477A (en) | 2017-08-11 |
| CN107035477B CN107035477B (en) | 2020-01-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486016A (en) * | 2017-08-22 | 2017-12-19 | 哈尔滨工程大学 | A kind of low-temp desulfurization denitration technology of marine low speed diesel engine suitable for high-sulfur fuel oil |
| CN107989676A (en) * | 2017-11-23 | 2018-05-04 | 南通象屿海洋装备有限责任公司 | A kind of ship power plant waste gases tapping equipment using HP-SCR technologies |
| CN108643994A (en) * | 2018-04-28 | 2018-10-12 | 湖南大学 | A kind of on-board engine exhaust energy multi-stage combination retracting device |
| CN108644021A (en) * | 2018-04-28 | 2018-10-12 | 江苏大学 | A kind of on-board engine exhaust energy multi-stage combination recycling and control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102888A (en) * | 1985-04-25 | 1986-10-22 | Bbc勃朗勃威力有限公司 | Supercharged marine diesel engine |
-
2017
- 2017-05-12 CN CN201710332162.9A patent/CN107035477B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102888A (en) * | 1985-04-25 | 1986-10-22 | Bbc勃朗勃威力有限公司 | Supercharged marine diesel engine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486016A (en) * | 2017-08-22 | 2017-12-19 | 哈尔滨工程大学 | A kind of low-temp desulfurization denitration technology of marine low speed diesel engine suitable for high-sulfur fuel oil |
| CN107989676A (en) * | 2017-11-23 | 2018-05-04 | 南通象屿海洋装备有限责任公司 | A kind of ship power plant waste gases tapping equipment using HP-SCR technologies |
| CN108643994A (en) * | 2018-04-28 | 2018-10-12 | 湖南大学 | A kind of on-board engine exhaust energy multi-stage combination retracting device |
| CN108644021A (en) * | 2018-04-28 | 2018-10-12 | 江苏大学 | A kind of on-board engine exhaust energy multi-stage combination recycling and control method |
| CN108644021B (en) * | 2018-04-28 | 2020-05-01 | 江苏大学 | Multi-stage combined recovery control method for exhaust energy of vehicle-mounted engine |
| CN108643994B (en) * | 2018-04-28 | 2020-06-19 | 湖南大学 | Multistage combined recovery device for exhaust energy of vehicle-mounted engine |
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| CN107035477B (en) | 2020-01-17 |
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