CN107989677B - 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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- CN107989677B CN107989677B CN201711220778.3A CN201711220778A CN107989677B CN 107989677 B CN107989677 B CN 107989677B CN 201711220778 A CN201711220778 A CN 201711220778A CN 107989677 B CN107989677 B CN 107989677B
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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 from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
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- 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 from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
- F01N5/025—Exhaust or silencing apparatus combined or associated with devices profiting from 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 from exhaust energy
- F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using kinetic energy
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- 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
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- 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
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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
Abstract
The invention discloses the residual heat combined recovery system of marine diesel EGR gas and control strategies, belong to marine diesel technical field of waste gas treatment.Recovery system is made of host 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, enters scavenging air box later, mixes 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 section waste heat, the energy utilization efficiency of whole system is improved, and according to the difference of operating condition, using different control strategies, ensure whole system energy utilization efficiency all with higher under each operating condition, reduces 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 technique
Data statistics, marine exhaust year discharge SOx account for about the 4% of world's total emission volumn, and year discharge NOx accounts for about world's discharge
The 7% of total amount.In the sea area that harbour, straits and some course lines are intensive, ship flow is big, it has also become the main pollution of this area
Source.International Maritime Organization (IMO) related data shows that marine exhaust discharge is increasingly severe to the pollution of environment, wherein SOx master
If the combustion product of the sulfur-bearing in fuel, atmosphere, especially SO are thrown into the formation of exhaust gas2Formation acid rain harm easy to oxidize
The mankind；NOx includes NO, NO2Deng wherein maximum to environmental hazard is NO and N02.In this regard, handling marine diesel exhaust gas
It is extremely urgent.
Ship is the huge means of transport of energy-output ratio, on the one hand high energy consumption makes vessel motion increased costs, another 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 project.The invention proposes the sides that a kind of marine diesel EGR gas waste heat efficient joint recycles
On the one hand method 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.It can be effectively solved using EGR technology
The problem of marine low speed Diesel NOx is discharged, is the requirement that ship meets Tier III emission regulation.However 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
It reduces；On the other hand, exhaust gas imports gas in-cylinder combustion again, and diesel combustion is caused to be deteriorated, and oil consumption increases, the economy of diesel engine
Property reduce.Therefore, it is necessary to a kind of new systems to improve the energy utilization of system simultaneously using the waste heat in exhaust gas and EGR
Efficiency makes up the system energy loss as caused by the effect of EGR.
Since IMO has promulgated corresponding regulation to the discharge of each pollutant, and require more and more tighter, control area
Also more and more extensively, therefore, a kind of system that association system can meet a variety of emission regulation demands simultaneously is becoming increasingly popular.Such as
Fruit emission control region (ECAs) continues to expand, then the control measure whole service time for meeting Tier III discharge standard is more next
Data that are longer, providing according to MAN, operation cost increases by 38% or so, while mounting cost is also high, increases the operation of shipowner
Cost.It is therefore proposed that the diesel exhaust under the conditions of a kind of III suitable for Tier recycles residual neat recovering system, make full use of
Various heats in operational process.
Summary of the invention
The purpose of the present invention is to provide the heats in a kind of effectively recycling exhaust gas and EGR, improve the energy of whole system
The residual heat combined recovery system of marine diesel EGR gas and control strategy of utilization efficiency.
The purpose of the present invention is realized by following technical solution:
It is 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, the energy utilization efficiency of whole system is improved, is in, under low load condition for high load capacity
It unites the otherness of each section energy figure, proposes 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, later 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, be discharged in atmosphere later 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 generates is first
It is introduced into fumer, exhaust gas is divided into two parts.1) a part of exhaust gas enters egr system, this portion is mixed with fresh air
It completes 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, later enter scavenging air box, mixed with fresh air；2) another part exhaust gas then enters waste heat recycling
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, is entered in waste heat boiler later, with two steam-return lines
Four heat exchange are completed, are discharged in atmosphere later.
The beneficial effects of the present invention are:
The method and control strategy of a kind of marine diesel EGR gas waste heat efficient joint recycling are proposed, is adopted
It is recycled with exhaust gas, so that the exhaust gas of diesel engine is discharged the requirement for meeting Tier III emission regulation, while bringing for egr system
Oil consumption increase, the problems such as the decline of the economy of diesel engine, be based on egr system, propose one kind can efficiently use exhaust gas and
The system of waste heat in EGR, improves the energy utilization efficiency of whole system, compensates for due to egr system application bring energy
Loss.
Detailed description of the invention
Fig. 1 is the residual heat combined recovery system Utilization plan schematic diagram of marine diesel EGR gas.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
Embodiment one:
The residual heat combined recovery system of marine diesel EGR gas, by host system, egr system, residual neat recovering system,
Turbo charge system composition；
Wherein, host system includes diesel engine 1, fumer 2；Egr system includes scavenging air box 16, valve group 4 21,
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 system and egr system are formed into a loop by valve group 4 21, scavenging air box 16, host system and turbo charge system
It is connected by valve group 1, high pressure EGR 23, low pressure EGR 24, the tertiary circuit evaporator 25 of egr system are recycled with waste heat respectively
The high tension loop superheater 6 of system, low tension loop superheater 8, low tension loop evaporator 9 connect, the scavenging air box 16 of egr system with
Residual neat recovering system connection；The high tension loop of the power turbine 4, turbocharger 5 and 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 connect 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 are as follows: tertiary circuit evaporator 25 is connect by valve group 6 27 with high tension loop drum 31, high tension loop
Drum 31 and high tension loop evaporator 7 are formed into a loop, and high tension loop drum 31 is overheated with high tension loop respectively by valve group 9 32
Device 6 and the connection of high pressure EGR 23, high tension loop superheater 6 and high pressure EGR 23 are connect with valve group 10, valve group 10 and high pressure
Circuit steam turbine 10 connects, and high tension loop steam turbine 10 is connect with condenser 13；
Low tension loop are as follows: tertiary circuit evaporator 25 is connect by valve group 5 26 with low tension loop drum 28, low tension loop
Drum 28 and low tension loop evaporator 9 are formed into a loop, 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 connect with valve group 8 30, and valve group 8 30 and low pressure are returned
Road steam turbine 11 connects, and low tension loop steam turbine 11 is connect with condenser 13；
Tertiary circuit are as follows: tertiary circuit evaporator 25, tertiary circuit superheater 22 and tertiary circuit steam turbine 12 sequentially connect
It connects, tertiary circuit steam turbine 12 is connect with condenser 13；
Additional branches are as follows: condenser 13 is connect with cylinder sleeve water- to-water heat exchanger 14, and cylinder sleeve water- to-water heat exchanger 14 is connect with air cooler 15,
According to the difference of host operating condition, working medium is connect by valve group 3 18 with flash tank 19 in air cooler 15, and air cooler 15 passes through
Valve group 2 17 is connect with valve group 5 26, and air cooler 15 is connect 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 generates exhaust gas, and exhaust gas comes out from waste heat box 2 is divided into two parts: 1) a part enters EGR system 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 and tertiary circuit superheater 22 form tertiary circuit, and high pressure EGR 23 and low pressure EGR 24 divide
Not by as the superheater in high tension loop and low tension loop, exhaust gas is complete with working substance steam first in tertiary circuit superheater 22
At heat exchange, later in high pressure EGR 23 with the working substance steam of high tension loop complete exchange heat, 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, later
It into scavenging air box 16, is mixed with fresh air, enters cylinder together later；2) another part exhaust gas then pass through valve group 1 into
Enter in power turbine 4 and turbocharger 5, for driving power turbine to generate electricity and compression 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, and a part enters high tension loop,
A part enters low tension loop, and another part enters tertiary circuit:
Residual neat recovering system high tension loop: part working medium enters high tension loop from valve group 6 27, initially enters height and pushes back
In road drum 31, be mixed into high tension loop evaporator 7 with the working medium in drum, 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 and exhaust gas completion exchange heat into one
Step is heated to superheat state, and in high pressure EGR 23, the exhaust gas in working medium and EGR is completed to exchange heat, and is also heated to overheat shape
State, this two parts working medium mix at valve group 10 later, enter in high tension loop steam turbine 10 together later, pushing turbine
Power generation enters in condenser condense later, 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 from valve group 5 26, initially enters low pressure and returns
In road drum 28, be mixed into low tension loop evaporator 9 with the working medium in drum, 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 and exhaust gas complete heat exchange further
It is heated to superheat state, in low pressure EGR 24, the exhaust gas in working medium and EGR is completed to exchange heat, it is also heated to superheat state,
It mixes at valve group 8 30 after this two parts working medium, enters in low tension loop steam turbine 11 together later, pushing turbine hair
Electricity enters in condenser condense later, mix 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
It completes 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 third later
In circuit superheater 22, working substance steam is further heated as superheat state, enters in tertiary circuit steam turbine 12 push later
Steam turbine acting, enters complete condensation in condenser 13 later, be prepared to enter into next circulation；
Working medium comes out from condenser 13, initially enters in cylinder sleeve water- to-water heat exchanger 14, completes to exchange heat with jacket water, working medium quilt
Preheating, working medium enters in air cooler 15 later, 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 in, under low load condition:
Under high-load condition, after working medium completes heat exchange with air in air cooler 15, 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 enters in flash tank 19 after completing heat exchange, part work
Matter becomes the steam of saturation overheat in flash tank 19, is saturated superheated steam by valve group 11 and low tension loop and mixes, it
Enter pushing turbine power generation, another part working medium in low tension loop steam turbine 11 together afterwards then to pass through overflow valve and enter valve group five
26, it is respectively enterd at valve group 5 26 in 3 remaining heat recovery circuits；
In, under low load condition, temperature is lower 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
It is respectively enterd in 3 remaining heat recovery circuits by the effect of valve group 5 26 and valve group 6 27.
Embodiment two:
The residual heat combined recovery system of marine diesel EGR gas in above-mentioned Fig. 1, exhaust gas comes out from waste heat box 2 to be divided into
Two parts: 1) a part by valve 21 enter egr system, be divided into egr system tertiary circuit superheater 22, high pressure EGR23,
Low pressure EGR 24 and 25 4 sections of tertiary circuit evaporator, wherein tertiary circuit evaporator 25 and the composition of tertiary circuit superheater 22 the
Respectively by as the superheater in high tension loop and low tension loop, exhaust gas exists first for three circuits, high pressure EGR23 and low pressure EGR 24
It completes to exchange heat with working substance steam in tertiary circuit superheater 22, working substance steam is further heated to superheat state, later in height
It presses in EGR23 and completes 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 is completed to exchange heat in tertiary circuit evaporator 25 with working medium, and working medium is heated to be steam, enters in scavenging air box 16 later,
It is mixed with fresh air, enters cylinder together later；2) another part exhaust gas then passes through valve 3 into power turbine 4 and turbine
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 come out, into cylinder sleeve water- to-water heat exchanger 14 with cylinder sleeve
Water completes heat exchange, enters in air cooler 15 complete to exchange heat with compressed air later, on the one hand cool down to air, on the other hand
The temperature of water is improved, working medium is divided into three parts at valve 26 and valve 27 later, and a part enters high tension loop, and a part enters low
Road is pushed back, another part enters tertiary circuit.
Residual neat recovering system high tension loop: part working medium enters high tension loop from valve 27, initially enters HP steam drum 31
In, be mixed into high tension loop evaporator 7 with the working medium in drum, 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 overheat by valve 32
In device 6 and high pressure EGR23, in high tension loop superheater 6, working medium and exhaust gas complete heat exchange and are 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
It mixes at valve 33, enters in high tension loop steam turbine 10 together later afterwards, pushing turbine power generation enters in condenser later
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 from valve 26, initially enters low-pressure drum 28
In, be mixed into low tension loop evaporator 9 with the working medium in drum, 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 overheat by valve 29
In device 8 and low pressure EGR 24, in low tension loop superheater 8, working medium and exhaust gas complete heat exchange and are 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
It mixes at valve 30, enters in low tension loop steam turbine 11 together later afterwards, pushing turbine power generation enters in condenser later
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 in third
It completes 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 later
In superheater 22, working substance steam is further heated as superheat state, enters pushing turbine acting in steam turbine 12 later, it
Enter afterwards and complete condensation in condenser 13, is prepared to enter into next circulation.
Working medium comes out from condenser 13, initially enters in cylinder sleeve water- to-water heat exchanger 14, completes to exchange heat with jacket water, working medium quilt
Preheating, working medium enters in air cooler 15 later, 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 in, under low load condition.
Under high-load condition, compressed air temperature is higher, and after working medium completes heat exchange with air in air cooler 15, working medium is logical
It is often heated on evaporating temperature, valve 18 is opened at this time, and valve 17 is closed, and working medium enters flash tank 19 after completing heat exchange
In, part working medium becomes the steam of saturation overheat in flash tank 19, and superheated steam is saturated by valve 34 and low tension loop and is mixed,
Enter pushing turbine power generation in steam turbine 11 together later, another part working medium then passes through overflow valve and enters valve 26, in valve 26
Place respectively enters in 3 remaining heat recovery circuits.
In, under low load condition, compressed air temperature is lower, and temperature is low after working medium completes heat exchange in air cooler 15
In working medium evaporating temperature, at this point, valve 17 is opened, valve 18 is closed, and flash tank is in bypass state, and working medium is completed in air cooler 15
It is respectively enterd in 3 remaining heat recovery circuits after heat exchange by the effect of valve 26 and valve 27.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. the residual heat combined recovery system of marine diesel EGR gas, which is characterized in that by host system, egr system, waste heat
Recovery system, turbo charge system composition；
Wherein, host 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 recycling 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 system and egr system are formed into a loop by valve group four (21), scavenging air box (16), host 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) connect with residual neat recovering system；Power turbine (4), turbocharger (5) and the waste heat of turbo charge system
The high tension loop superheater (6) of recovery system connects；
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 are as follows: tertiary circuit evaporator (25) is connect 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) connection are pushed back, high tension loop superheater (6) and high pressure EGR (23) and valve group ten (33) are even
It connects, valve group ten (33) is connect with high tension loop steam turbine (10), and high tension loop steam turbine (10) is connect with condenser (13)；
Low tension loop are as follows: tertiary circuit evaporator (25) is connect 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) and valve group eight (30) are even
It connects, valve group eight (30) is connect with low tension loop steam turbine (11), and low tension loop steam turbine (11) is connect with condenser (13)；
Tertiary circuit are as follows: tertiary circuit evaporator (25), tertiary circuit superheater (22) and tertiary circuit steam turbine (12) are sequentially
Connection, tertiary circuit steam turbine (12) are connect with condenser (13)；
Additional branches are as follows: condenser (13) is connect 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 connect by valve group three (18) with flash tank (19) in air cooler (15)；Or
Person's air cooler (15) is connect by valve group two (17) with valve group five (26)；Or air cooler (15) passes through valve group two (17), overflow
Valve (20) is connect with flash tank (19).
2. the residual heat combined recovery system of marine diesel EGR gas according to claim 1, it is characterised in that: 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 connect by scavenging air box (16) with the cylinder of host (1).
3. the residual heat combined recovery system of marine diesel EGR gas according to claim 1 or 2, it is characterised in that:
A kind of control strategy including residual heat combined recovery system of marine diesel EGR gas:
Host (1) generates exhaust gas, and exhaust gas comes out from waste heat box (2) is divided into two parts: 1) a part enters EGR system 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) form 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) it completes to exchange heat with working substance steam in, completes to exchange heat with the working substance steam of high tension loop in high pressure EGR (23) later, low
It presses in EGR (24) and completes to exchange heat with the working substance steam in low tension loop, changed in tertiary circuit evaporator (25) with working medium completion
Heat, working medium are heated to be steam, and exhaust gas enters in scavenging air box (16) later, mix with fresh air, enter cylinder together later；
2) another part exhaust gas then passes through valve group one (3) and enters in power turbine (4) and turbocharger (5), for driving power whirlpool
Wheel power generation and compression fresh air, two parts exhaust gas is mixed in turbine outlet, into residual neat recovering system；
In residual neat recovering system, working medium is divided into three parts at valve group five (26) and valve group six (27), and a part enters high tension loop,
A part enters low tension loop, and another part enters tertiary circuit:
Residual neat recovering system high tension loop: part working medium enters high tension loop at valve group six (27), initially enters high tension loop
It in drum (31), is mixed into high tension loop evaporator (7) with the working medium in drum, 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) it respectively enters 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
It is heated to superheat state, is mixed at valve group ten (33) after this two parts working medium, enters high tension loop steam turbine together later
(10) in, pushing turbine power generation enters in condenser condense later, 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 at valve group five (26), initially enters low tension loop
It in drum (28), is mixed into low tension loop evaporator (9) with the working medium in drum, 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) it respectively enters 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
It is heated to superheat state, is mixed at valve group eight (30) after this two parts working medium, enters low tension loop steam turbine together later
(11) in, pushing turbine power generation enters in condenser condense later, mixes, be prepared to enter into the condensation working medium of high tension loop
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
It completes 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 third later
In circuit superheater (22), working substance steam is further heated as superheat state, is entered in tertiary circuit steam turbine (12) later
Pushing turbine acting, enters complete condensation in condenser (13) later, be prepared to enter into next circulation；
Working medium comes out from condenser (13), initially enters in cylinder sleeve water- to-water heat exchanger (14), completes to exchange heat with jacket water, working medium quilt
Preheating, working medium enters in air cooler (15) later, 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 in, under low load condition:
Under high-load condition, after working medium completes heat exchange with air in air cooler (15), 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 enters in flash tank (19) after completing heat exchange, portion
Division of labor matter becomes the steam of saturation overheat in flash tank (19), is saturated superheated steam by valve group 11 (34) and low tension loop
It mixes, enters pushing turbine power generation, another part working medium in low tension loop steam turbine (11) together later and then pass through overflow valve
Into valve group five (26), respectively enterd at valve group five (26) in 3 remaining heat recovery circuits；
In, under low load condition, temperature is lower 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)
It is respectively enterd in 3 remaining heat recovery circuits after heat by the effect of valve group five (26) and valve group six (27).
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