CN107989677A - The residual heat combined recovery system of marine diesel EGR gas and control strategy - Google Patents
The residual heat combined recovery system of marine diesel EGR gas and control strategy Download PDFInfo
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- CN107989677A CN107989677A CN201711220778.3A CN201711220778A CN107989677A CN 107989677 A CN107989677 A CN 107989677A CN 201711220778 A CN201711220778 A CN 201711220778A CN 107989677 A CN107989677 A CN 107989677A
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- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000011217 control strategy Methods 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 78
- 239000002918 waste heat Substances 0.000 claims abstract description 24
- 230000002000 scavenging effect Effects 0.000 claims abstract description 13
- 238000010248 power generation Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 13
- 238000001704 evaporation Methods 0.000 claims description 12
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical compound [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
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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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
- F01N5/025—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat the device being thermoelectric generators
-
- 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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using kinetic energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses the residual heat combined recovery system of marine diesel EGR gas and control strategy, belong to marine diesel technical field of waste gas treatment.Recovery system is made of host computer system, egr system, residual neat recovering system, turbo charge system.A part of exhaust gas enters egr system, this portion is completed to exchange heat twice before mixing with fresh air, afterwards into scavenging air box, mixed with fresh air；Another part exhaust gas then enters residual neat recovering system, and a portion enters in exhaust dynamics turbine, and driving power turbine power generation, another part enters in turbocharger, for compressing fresh air.The strategy can effectively recycle host each several part waste heat, the energy utilization efficiency of whole system is improved, and according to the difference of operating condition, using different control strategies, ensure that whole system all has higher energy utilization efficiency under each operating mode, reduce the operation cost of system.
Description
Technical field
The invention belongs to marine diesel technical field of waste gas treatment, and in particular to marine diesel EGR gas waste heat
Combined recovery system of automobile and control strategy.
Background technology
Data statistics, marine exhaust year discharge SOx account for the 4% of world's total emission volumn, and year discharge NOx accounts for world's discharge
The 7% of total amount.In harbour, straits and some course lines are intensive, ship flow is big sea area, it has also become the main pollution of this area
Source.International Maritime Organization (IMO) related data shows that pollution of the marine exhaust discharge to environment is increasingly severe, wherein SOx master
If the combustion product of the sulfur-bearing in fuel, air, especially SO are thrown into the formation of exhaust gas2Easily oxidation forms acid rain harm
The mankind；NOx includes NO, NO2Deng wherein that maximum to environmental hazard is NO and N02.In this regard, marine diesel exhaust gas is handled
It is extremely urgent.
Ship is the huge means of transport of energy-output ratio, 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
Big and reality problem.The present invention proposes the side that a kind of marine diesel EGR gas waste heat efficient joint recycles
Method, on the one hand reduces the discharge of NOx, has on the other hand effectively recycled the waste heat in exhaust gas and EGR, improved whole system
Energy utilization efficiency.
For Exhaust Control for Diesel Engine, emphasis is the discharge for controlling NOx.Can effectively it be solved using EGR technology
The problem of marine low speed Diesel NOx is discharged, is the requirement that ship meets Tier III Abgasgesetzs.But the technology is by diesel oil
A part of exhaust gas of machine imports cylinder again, on the one hand reduces the exhausted air quantity of diesel engine, traditional residual neat recovering system economy
Reduce；On the other hand, exhaust gas imports gas in-cylinder combustion again, causes diesel combustion to be deteriorated, oil consumption increase, the economy of diesel engine
Property reduce.The waste heat in exhaust gas and EGR can be utilized at the same time therefore, it is necessary to a kind of new system, improve the energy utilization of system
Efficiency, makes up due to system energy loss caused by the effect of EGR.
Since corresponding regulation has all been promulgated in discharges of the IMO to each pollutant, and require more and more tighter, control area
Also increasingly wider, therefore, a kind of association system can meet that the system of a variety of emission regulation demands is becoming increasingly popular at the same time.Such as
Fruit emission control region (ECAs) continues to expand, then meets that the control measure whole service time of Tier III discharge standards is more next
Data that are longer, being provided according to MAN, operation cost increase by 38% or so, while mounting cost is also high, adds the operation of shipowner
Cost.It is therefore proposed that a kind of diesel exhaust recycling residual neat recovering system being suitable under the conditions of Tier III, makes full use of
Various heats in operational process.
The content of the invention
It is an object of the invention to provide the heat in a kind of effectively recycling exhaust gas and EGR, the energy of whole system is improved
The residual heat combined recovery system of marine diesel EGR gas and control strategy of utilization ratio.
The purpose of the present invention is realized by following technical solution：
Recycled using exhaust gas, a part of exhaust gas imports cylinder again, reduces the ignition temperature in cylinder, reduces in exhaust gas
The discharge of NOx, meanwhile, a kind of marine diesel exhaust gas recycling waste heat recycling system is proposed based on egr system, is effectively returned
The heat in exhaust gas and EGR is received, improves the energy utilization efficiency of whole system, is with, under low load condition for high load capacity
Unite the otherness of each several part energy figure, propose a kind of control strategy, make under each loading condiction of system energy utilization efficiency most
It is high.
The residual heat combined recovery system of marine diesel EGR gas, including host, egr system, residual neat recovering system, whirlpool
Take turns booster etc..It is characterized in that host exhaust gas initially enters fumer, a part of exhaust gas enters in egr system, afterwards with it is fresh
Air mixing reenters cylinder, and another part exhaust gas enters residual neat recovering system, wherein, a part of exhaust gas enters power whirlpool
Wheel, driving power turbine power generation, a part of exhaust gas enters turbocharger, and for compressing fresh air, this two exhaust gas are in whirlpool
Wheel outlet mixing, completes to exchange heat, is discharged to afterwards in air into waste heat boiler with water vapour.
The control strategy of the residual heat combined recovery system of marine diesel EGR gas：The exhaust gas that diesel engine produces is first
Fumer is introduced into, exhaust gas is divided into two parts.1) a part of exhaust gas enters egr system, this portion is mixed with fresh air
Complete to exchange heat twice before closing, the water vapour in high temperature section and high tension loop is completed to exchange heat, in low-temperature zone and low tension loop
Water vapour complete heat exchange, afterwards into scavenging air box, mixed with fresh air；2) another part exhaust gas then enters waste heat recovery
System, a portion enter in exhaust dynamics turbine, and driving power turbine power generation, another part enters in turbocharger,
For compressing fresh air, this two parts exhaust gas is mixed in turbine outlet, afterwards into waste heat boiler, with two steam-return lines
Four heat exchange are completed, are discharged to afterwards in air.
The beneficial effects of the present invention are：
Method and the control strategy that a kind of marine diesel EGR gas waste heat efficient joint recycles are proposed, is adopted
Recycled with exhaust gas, the exhaust gas of diesel engine is discharged the requirement for meeting Tier III Abgasgesetzs, while brought for egr system
Oil consumption increase, the problems such as economy of diesel engine declines, based on egr system, it is proposed that one kind can efficiently use exhaust gas and
The system of waste heat in EGR, improves the energy utilization efficiency of whole system, compensate for the energy brought due to egr system application
Loss.
Brief description of the drawings
Fig. 1 is the residual heat combined recovery system Utilization plan schematic diagram of marine diesel EGR gas.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Embodiment one：
The residual heat combined recovery system of marine diesel EGR gas, by host computer system, egr system, residual neat recovering system,
Turbo charge system forms；
Wherein, host computer system includes diesel engine 1, fumer 2；Egr system includes scavenging air box 16, valve group 4 21, the
Three circuit superheaters 22, high pressure EGR 23, low pressure EGR 24, tertiary circuit evaporator 25；Residual neat recovering system includes high tension loop
Superheater 6, high tension loop evaporator 7, low tension loop superheater 8, low tension loop evaporator 9, high tension loop steam turbine 10, low pressure
Circuit steam turbine 11, tertiary circuit steam turbine 12, condenser 13, cylinder sleeve water- to-water heat exchanger 14, air cooler 15, valve group 2 17, valve group
3 18, flash tank 19, overflow valve 20, valve group 5 26, valve group 6 27, low tension loop drum 28, valve group 7 29, valve group 8 30, height
Push back road drum 31, valve group 9 32, valve group 10, valve group 11；Turbo charge system include valve group 1, power turbine 4,
Turbocharger 5；
Host computer system is formed into a loop with egr system by valve group 4 21, scavenging air box 16, host computer system and turbo charge system
Connected by valve group 1, the high pressure EGR 23 of egr system, low pressure EGR 24, tertiary circuit evaporator 25 respectively with waste heat recovery
High tension loop superheater 6, low tension loop superheater 8, the low tension loop evaporator 9 of system connect, the scavenging air box 16 of egr system with
Residual neat recovering system connects；Power turbine 4, turbocharger 5 and the high tension loop of residual neat recovering system of turbo charge system
Superheater 6 connects.
In the egr system, tertiary circuit superheater 22, high pressure EGR 23, low pressure EGR 24 and tertiary circuit evaporator
25 4 sections are sequentially connected with, and tertiary circuit evaporator 25 is connected by scavenging air box 16 with the cylinder of host 1.
The residual neat recovering system is made of high tension loop, low tension loop, tertiary circuit and four part of additional branches；
High tension loop is：Tertiary circuit evaporator 25 is connected by valve group 6 27 with high tension loop drum 31, high tension loop
Drum 31 is formed into a loop with high tension loop evaporator 7, and high tension loop drum 31 is overheated with high tension loop respectively by valve group 9 32
Device 6 and high pressure EGR 23 are connected, and high tension loop superheater 6 and high pressure EGR 23 are connected with valve group 10, valve group 10 and high pressure
Circuit steam turbine 10 connects, and high tension loop steam turbine 10 is connected with condenser 13；
Low tension loop is：Tertiary circuit evaporator 25 is connected by valve group 5 26 with low tension loop drum 28, low tension loop
Drum 28 is formed into a loop with low tension loop evaporator 9, and low tension loop drum 28 is overheated with low tension loop respectively by valve group 7 29
Device 8 and low pressure EGR 24 connect, and low tension loop superheater 8 and low pressure EGR 24 are connected with valve group 8 30, and valve group 8 30 is returned with low pressure
Road steam turbine 11 connects, and low tension loop steam turbine 11 is connected with condenser 13；
Tertiary circuit is：Tertiary circuit evaporator 25, tertiary circuit superheater 22 and tertiary circuit steam turbine 12 sequentially connect
Connect, tertiary circuit steam turbine 12 is connected with condenser 13；
Additional branches are：Condenser 13 is connected with cylinder sleeve water- to-water heat exchanger 14, and cylinder sleeve water- to-water heat exchanger 14 is connected with air cooler 15,
According to the difference of host operating condition, working medium is connected in air cooler 15 by valve group 3 18 with flash tank 19, and air cooler 15 passes through
Valve group 2 17 is connected with valve group 5 26, and air cooler 15 is connected by valve group 2 17, overflow valve 20 with flash tank 19.
A kind of control strategy of the residual heat combined recovery system of marine diesel EGR gas：
Host 1 produces exhaust gas, and exhaust gas is out divided into two parts from waste heat box 2：1) part enters EGR systems by valve 21
System, is divided into tertiary circuit superheater 22, high pressure EGR 23, low pressure EGR 24 and tertiary circuit evaporator 25 4 in egr system
Section, wherein tertiary circuit evaporator 25 form tertiary circuit with tertiary circuit superheater 22, and high pressure EGR 23 and low pressure EGR 24 divide
Not by complete with working substance steam first in tertiary circuit superheater 22 as the superheater in high tension loop and low tension loop, exhaust gas
Into heat exchange, complete to exchange heat with the working substance steam of high tension loop in high pressure EGR 23 afterwards, in low pressure EGR 24 with low tension loop
In working substance steam complete heat exchange, complete to exchange heat with working medium in tertiary circuit evaporator 25, working medium is heated to be steam, afterwards
Into in scavenging air box 16, mixed with fresh air, enter cylinder together afterwards；2) another part exhaust gas then by valve group 1 into
Enter in power turbine 4 and turbocharger 5, for driving power turbine to generate electricity and compressing fresh air, two parts exhaust gas is in whirlpool
Wheel outlet mixing, into residual neat recovering system；
In residual neat recovering system, working medium is divided into three parts at valve group 5 26 and valve group 6 27, is partly into high tension loop,
Low tension loop is partly into, another part enters tertiary circuit：
Residual neat recovering system high tension loop：Part working medium enters high tension loop at valve group 6 27, initially enters height and pushes back
In road drum 31, be mixed into the working medium in drum in high tension loop evaporator 7, working medium in high tension loop evaporator 7 only
Some working medium is evaporated, and in high tension loop drum 31, completes gas-liquid separation, the part of evaporation is distinguished by valve group 9 32
Into in high tension loop superheater 6 and high pressure EGR 23, in high tension loop superheater 6, working medium is completed to exchange heat into one with exhaust gas
Step is heated to superheat state, and in high pressure EGR 23, working medium is completed to exchange heat with the exhaust gas in EGR, is also heated to overheat shape
State, this two parts working medium are mixed at valve group 10, entered together in high tension loop steam turbine 10 afterwards, pushing turbine afterwards
Power generation, afterwards into condensing in condenser, is prepared to enter into subsequent cycle, and remainder is again introduced into high tension loop drum 31
In high tension loop evaporator 7；
Residual neat recovering system low tension loop：Part working medium enters low tension loop at valve group 5 26, initially enters low pressure and returns
In road drum 28, be mixed into the working medium in drum in low tension loop evaporator 9, working medium in low tension loop evaporator 9 only
Some working medium is evaporated, and in low tension loop drum 28, completes gas-liquid separation, the part of evaporation is distinguished by valve group 7 29
Into in low tension loop superheater 8 and low pressure EGR 24, in low tension loop superheater 8, working medium completes heat exchange further with exhaust gas
Superheat state is heated to, in low pressure EGR 24, working medium is completed to exchange heat with the exhaust gas in EGR, is also heated to superheat state,
Mix at valve group 8 30 after this two parts working medium, enter together in low tension loop steam turbine 11 afterwards, pushing turbine hair
Electricity, afterwards into condensing in condenser, mixes with the condensation working medium of high tension loop, is prepared to enter into subsequent cycle, and low tension loop
Remainder is again introduced into low tension loop evaporator 9 in drum 28；
Residual neat recovering system tertiary circuit：A part of working medium is entered in tertiary circuit by valve group 6 27, and working medium exists first
Complete to exchange heat with the exhaust gas in EGR in tertiary circuit evaporator 25, working medium is heated to be superheat state, and exhaust gas enters the 3rd afterwards
In circuit superheater 22, working substance steam is further heated as superheat state, afterwards into promoting in tertiary circuit steam turbine 12
Steam turbine does work, and afterwards into completion condensation in condenser 13, is prepared to enter into next circulation；
Working medium out, is initially entered in cylinder sleeve water- to-water heat exchanger 14 from condenser 13, completes to exchange heat with jacket water, working medium quilt
Preheat, working medium enters in air cooler 15 afterwards, and according to the difference of host operating condition, working medium is divided into two kinds after air cooler 15
The method of operation：Under high-load condition with, under low load condition：
Under high-load condition, after working medium completes heat exchange in air cooler 15 with air, working medium is typically heated to evaporation temperature
On degree, valve group 3 18 is opened at this time, and valve group 2 17 is closed, and working medium is entering in flash tank 19 after completing heat exchange, part work
Matter is changed into the steam of saturation overheat in flash tank 19, is mixed by valve group 11 and low tension loop saturation superheated steam, it
Enter pushing turbine in low tension loop steam turbine 11 together afterwards to generate electricity, another part working medium then enters valve group five by overflow valve
26, respectively enterd at valve group 5 26 in 3 waste heat recovery circuits；
In, under low load condition, temperature is less than working medium evaporating temperature after working medium completes heat exchange in air cooler 15, this
When, valve group 2 17 is opened, and valve group 3 18 is closed, and flash tank is in bypass state, and working medium is completed in air cooler 15 after heat exchange
Respectively enterd by the effect of valve group 5 26 and valve group 6 27 in 3 waste heat recovery circuits.
Embodiment two：
The residual heat combined recovery system of marine diesel EGR gas in above-mentioned Fig. 1, exhaust gas are out divided into from waste heat box 2
Two parts：1) part by valve 21 enters egr system, be divided into egr system tertiary circuit superheater 22, high pressure EGR23,
25 4 sections of low pressure EGR 24 and tertiary circuit evaporator, wherein tertiary circuit evaporator 25 and tertiary circuit superheater 22 composition the
Three circuits, high pressure EGR23 and low pressure EGR 24 are existed first as the superheater in high tension loop and low tension loop, exhaust gas respectively
Complete to exchange heat with working substance steam in tertiary circuit superheater 22, working substance steam is further heated to superheat state, afterwards in height
Press in EGR23 and complete to exchange heat with the working substance steam of high tension loop, completed in low pressure EGR 24 with the working substance steam in low tension loop
Heat exchange, completes to exchange heat in tertiary circuit evaporator 25 with working medium, and working medium is heated to be steam, afterwards into scavenging air box 16,
Mixed with fresh air, enter cylinder together afterwards；2) another part exhaust gas then enters power turbine 4 and turbine by valve 3
In booster 5, for driving power turbine to generate electricity and compression fresh air, two parts exhaust gas is mixed in turbine outlet, into remaining
In heat recovery system.In residual neat recovering system, working medium from condenser 13 out, into cylinder sleeve water- to-water heat exchanger 14 with cylinder sleeve
Water completes heat exchange, completes to exchange heat with compressed air into air cooler 15 afterwards, on the one hand air is cooled down, on the other hand
The temperature of water is improved, working medium is divided into three parts at valve 26 and valve 27 afterwards, is partly into high tension loop, is partly into low
Road is pushed back, another part enters tertiary circuit.
Residual neat recovering system high tension loop：Part working medium enters high tension loop at valve 27, initially enters HP steam drum 31
In, be mixed into the working medium in drum in high tension loop evaporator 7, working medium in high tension loop evaporator 7 only some
Working medium is evaporated, and in HP steam drum 31, completes gas-liquid separation, the part of evaporation respectively enters high tension loop by valve 32 and overheats
In device 6 and high pressure EGR23, in high tension loop superheater 6, working medium completes heat exchange with exhaust gas and is further heated to overheat shape
State, in high pressure EGR23, the exhaust gas in working medium and EGR is completed to exchange heat, and is also heated to superheat state, this two parts working medium it
Mix at valve 33, enter together in high tension loop steam turbine 10 afterwards afterwards, pushing turbine power generation, afterwards into condenser
Condensation, is prepared to enter into subsequent cycle, and remainder is again introduced into evaporator 7 in HP steam drum 31.
Residual neat recovering system low tension loop：Part working medium enters low tension loop at valve 26, initially enters low-pressure drum 28
In, be mixed into the working medium in drum in low tension loop evaporator 9, working medium in low tension loop evaporator 9 only some
Working medium is evaporated, and in low-pressure drum 28, completes gas-liquid separation, the part of evaporation respectively enters high tension loop by valve 29 and overheats
In device 8 and low pressure EGR 24, in low tension loop superheater 8, working medium completes heat exchange with exhaust gas and is further heated to overheat shape
State, in low pressure EGR 24, the exhaust gas in working medium and EGR is completed to exchange heat, and is also heated to superheat state, this two parts working medium it
Mix at valve 30, enter together in low tension loop steam turbine 11 afterwards afterwards, pushing turbine power generation, afterwards into condenser
Condensation, mixes with the condensation working medium of high tension loop, is prepared to enter into subsequent cycle, and remainder is again introduced into HP steam drum 28
In evaporator 9.
Residual neat recovering system tertiary circuit：A part of working medium is entered in tertiary circuit by valve 27, and working medium is first the 3rd
Complete to exchange heat with the exhaust gas in EGR in loop evaporator 25, working medium is heated to be superheat state, and exhaust gas enters tertiary circuit afterwards
In superheater 22, working substance steam is further heated as superheat state, is done work afterwards into pushing turbine in steam turbine 12, it
Enter afterwards and condensation is completed in condenser 13, be prepared to enter into next circulation.
Working medium out, is initially entered in cylinder sleeve water- to-water heat exchanger 14 from condenser 13, completes to exchange heat with jacket water, working medium quilt
Preheat, working medium enters in air cooler 15 afterwards, and according to the difference of host operating condition, working medium is divided into two kinds after air cooler 15
The method of operation：Under high-load condition with, under low load condition.
Under high-load condition, compressed air temperature is higher, and after working medium completes heat exchange in air cooler 15 with air, working medium is led to
Often it is heated on evaporating temperature, valve 18 is opened at this time, and valve 17 is closed, and working medium enters flash tank 19 after heat exchange is completed
In, part working medium is changed into the steam of saturation overheat in flash tank 19, is mixed by valve 34 and low tension loop saturation superheated steam,
Enter pushing turbine in steam turbine 11 together afterwards to generate electricity, another part working medium then enters valve 26 by overflow valve, in valve 26
Place is respectively enterd in 3 waste heat recovery circuits.
In, under low load condition, compressed air temperature is relatively low, and temperature is low after working medium completes heat exchange in air cooler 15
In working medium evaporating temperature, at this time, valve 17 is opened, and valve 18 is closed, and flash tank is in bypass state, and working medium is completed in air cooler 15
Respectively enterd after heat exchange by the effect of valve 26 and valve 27 in 3 waste heat recovery circuits.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. the residual heat combined recovery system of marine diesel EGR gas, it is characterised in that by host computer system, egr system, waste heat
Recovery system, turbo charge system composition；
Wherein, host computer system includes diesel engine (1), fumer (2)；Egr system includes scavenging air box (16), valve group four
(21), tertiary circuit superheater (22), high pressure EGR (23), low pressure EGR (24), tertiary circuit evaporator (25)；Waste heat recovery system
System includes high tension loop superheater (6), high tension loop evaporator (7), low tension loop superheater (8), low tension loop evaporator
(9), high tension loop steam turbine (10), low tension loop steam turbine (11), tertiary circuit steam turbine (12), condenser (13), cylinder sleeve
Water- to-water heat exchanger (14), air cooler (15), valve group two (17), valve group three (18), flash tank (19), overflow valve (20), valve group five
(26), valve group six (27), low tension loop drum (28), valve group seven (29), valve group eight (30), high tension loop drum (31), valve group
Nine (32), valve group ten (33), valve group 11 (34)；Turbo charge system includes valve group one (3), power turbine (4), turbocharging
Device (5)；
Host computer system is formed into a loop with egr system by valve group four (21), scavenging air box (16), host computer system and turbo charge system
Connected by valve group one (3), the high pressure EGR (23) of egr system, low pressure EGR (24), tertiary circuit evaporator (25) respectively with it is remaining
The high tension loop superheater (6) of heat recovery system, low tension loop superheater (8), low tension loop evaporator (9) connection, egr system
Scavenging air box (16) be connected with residual neat recovering system；Power turbine (4), turbocharger (5) and the waste heat of turbo charge system
High tension loop superheater (6) connection of recovery system.
2. the residual heat combined recovery system of marine diesel EGR gas according to claim 1, it is characterised in that：It is described
Egr system in, tertiary circuit superheater (22), high pressure EGR (23), low pressure EGR (24) and tertiary circuit evaporator (25) four
Section is sequentially connected with, and tertiary circuit evaporator (25) is connected by scavenging air box (16) with the cylinder of host (1).
3. according to claim 1, the residual heat combined recovery system of marine diesel EGR gas described in 2, it is characterised in that：Institute
The residual neat recovering system stated is made of high tension loop, low tension loop, tertiary circuit and four part of additional branches；
High tension loop is：Tertiary circuit evaporator (25) is connected by valve group six (27) with high tension loop drum (31), and height pushes back
Road drum (31) and high tension loop evaporator (7) are formed into a loop, high tension loop drum (31) by valve group nine (32) respectively with height
Road superheater (6) and high pressure EGR (23) connections are pushed back, high tension loop superheater (6) and high pressure EGR (23) connect with valve group ten (33)
Connect, valve group ten (33) is connected with high tension loop steam turbine (10), and high tension loop steam turbine (10) is connected with condenser (13)；
Low tension loop is：Tertiary circuit evaporator (25) is connected by valve group five (26) with low tension loop drum (28), and low pressure is returned
Road drum (28) and low tension loop evaporator (9) are formed into a loop, low tension loop drum (28) by valve group seven (29) respectively with it is low
Road superheater (8) and low pressure EGR (24) connection are pushed back, low tension loop superheater (8) and low pressure EGR (24) connect with valve group eight (30)
Connect, valve group eight (30) is connected with low tension loop steam turbine (11), and low tension loop steam turbine (11) is connected with condenser (13)；
Tertiary circuit is：Tertiary circuit evaporator (25), tertiary circuit superheater (22) and tertiary circuit steam turbine (12) are sequentially
Connection, tertiary circuit steam turbine (12) are connected with condenser (13)；
Additional branches are：Condenser (13) is connected with cylinder sleeve water- to-water heat exchanger (14), cylinder sleeve water- to-water heat exchanger (14) and air cooler (15)
Connection, according to the difference of host operating condition, working medium is connected in air cooler (15) by valve group three (18) with flash tank (19), empty
Cooler (15) is connected by valve group two (17) with valve group five (26), air cooler (15) by valve group two (17), overflow valve (20) with
Flash tank (19) connects.
4. according to claim 1, the residual heat combined recovery system of marine diesel EGR gas described in 2, it is characterised in that：Bag
Include a kind of control strategy of the residual heat combined recovery system of marine diesel EGR gas：
Host (1) produces exhaust gas, and exhaust gas is out divided into two parts from waste heat box (2)：1) part enters EGR systems by valve 21
System, is divided into tertiary circuit superheater (22), high pressure EGR (23), low pressure EGR (24) and tertiary circuit evaporator in egr system
(25) four sections, wherein tertiary circuit evaporator (25) and tertiary circuit superheater (22) composition tertiary circuit, high pressure EGR (23) and
Low pressure EGR (24) is respectively by as the superheater in high tension loop and low tension loop, and exhaust gas is first in tertiary circuit superheater
(22) complete to exchange heat with working substance steam in, complete to exchange heat with the working substance steam of high tension loop in high pressure EGR (23) afterwards, low
Press in EGR (24) and complete to exchange heat with the working substance steam in low tension loop, complete to change with working medium in tertiary circuit evaporator (25)
Heat, working medium are heated to be steam, afterwards into scavenging air box (16), are mixed with fresh air, enter cylinder together afterwards；2) it is another
A part of exhaust gas is then entered in power turbine (4) and turbocharger (5) by valve group one (3), for driving power turbine to send out
Electricity and compression fresh air, two parts exhaust gas is mixed in turbine outlet, into residual neat recovering system；
In residual neat recovering system, valve group five (26) and valve group six (27) place working medium are divided into three parts, are partly into high tension loop,
Low tension loop is partly into, another part enters tertiary circuit：
Residual neat recovering system high tension loop：Part working medium enters high tension loop from valve group six (27), initially enters high tension loop
In drum (31), it is mixed into the working medium in drum in high tension loop evaporator (7), working medium is in high tension loop evaporator (7)
In only some working medium be evaporated, in high tension loop drum (31), complete gas-liquid separation, the part of evaporation passes through valve group nine
(32) respectively enter in high tension loop superheater (6) and high pressure EGR (23), in high tension loop superheater (6), working medium and exhaust gas
Complete heat exchange and be further heated to superheat state, in high pressure EGR (23), the exhaust gas in working medium and EGR is completed to exchange heat, also by
Superheat state is heated to, is mixed after this two parts working medium at valve group ten (33) place, enters high tension loop steam turbine together afterwards
(10) in, pushing turbine power generation, afterwards into condensing in condenser, is prepared to enter into subsequent cycle, and high tension loop drum
(31) remainder is again introduced into high tension loop evaporator (7) in；
Residual neat recovering system low tension loop：Part working medium enters low tension loop from valve group five (26), initially enters low tension loop
In drum (28), it is mixed into the working medium in drum in low tension loop evaporator (9), working medium is in low tension loop evaporator (9)
In only some working medium be evaporated, in low tension loop drum (28), complete gas-liquid separation, the part of evaporation passes through valve group seven
(29) respectively enter in low tension loop superheater (8) and low pressure EGR (24), in low tension loop superheater (8), working medium and exhaust gas
Complete heat exchange and be further heated to superheat state, in low pressure EGR (24), the exhaust gas in working medium and EGR is completed to exchange heat, also by
Superheat state is heated to, is mixed after this two parts working medium at valve group eight (30) place, enters low tension loop steam turbine together afterwards
(11) in, pushing turbine power generation, afterwards into condensing in condenser, mixes with the condensation working medium of high tension loop, is prepared to enter into
Subsequent cycle, and remainder is again introduced into low tension loop evaporator (9) in low tension loop drum (28)；
Residual neat recovering system tertiary circuit：A part of working medium is entered in tertiary circuit by valve group six (27), and working medium is first the
Complete to exchange heat with the exhaust gas in EGR in three loop evaporators (25), working medium is heated to be superheat state, and exhaust gas enters the 3rd afterwards
In circuit superheater (22), working substance steam is further heated as superheat state, afterwards into tertiary circuit steam turbine (12)
Pushing turbine does work, and afterwards into completion condensation in condenser (13), is prepared to enter into next circulation；
Working medium out, is initially entered in cylinder sleeve water- to-water heat exchanger (14) from condenser (13), completes to exchange heat with jacket water, working medium quilt
Preheat, working medium enters in air cooler (15) afterwards, and according to the difference of host operating condition, working medium is divided into after air cooler (15)
Two kinds of methods of operation：Under high-load condition with, under low load condition：
Under high-load condition, after working medium completes heat exchange in air cooler (15) with air, working medium is typically heated to evaporating temperature
On, valve group three (18) is opened at this time, and valve group two (17) is closed, and working medium is entering in flash tank (19) after completing heat exchange, portion
Division of labor matter is changed into the steam of saturation overheat in flash tank (19), passes through valve group 11 (34) and low tension loop saturation superheated steam
Mix, enter pushing turbine in low tension loop steam turbine (11) together afterwards and generate electricity, another part working medium then passes through overflow valve
Into valve group five (26), respectively enterd at valve group five (26) place in 3 waste heat recovery circuits；
In, under low load condition, temperature is less than working medium evaporating temperature after working medium completes heat exchange in air cooler (15), this
When, valve group two (17) is opened, and valve group three (18) is closed, and flash tank is in bypass state, and working medium is completed to change in air cooler (15)
Respectively enterd after heat by the effect of valve group five (26) and valve group six (27) in 3 waste heat recovery circuits.
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