CN103967648B - A kind of marine low speed diesel residual heat comprehensive recovery system - Google Patents
A kind of marine low speed diesel residual heat comprehensive recovery system Download PDFInfo
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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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Abstract
The present invention is to provide a kind of marine low speed diesel residual heat comprehensive recovery system.Comprise combination afterheat boiler system, power turbine power generation system, turbine generating system, high-temperature cooling water utilize heat transmission equipment and organic working medium turbine generating system.The present invention reclaims marine low speed diesel engine exhaust heat energy effectively by combination exhaust heat boiler; Effectively reclaim the waste heat of marine low speed diesel engine jacket-cooling water and pressurized air air-cooled heat exchanger cooling water by jacket water heat exchanger and 3 stops air-cooled heat exchanger, reclaimed the hot water energy of diesel exhaust gas pressure energy and cryogenic fluid steam turbine recovery boiler and air-cooled heat exchanger by power turbine, and be converted into electric energy, reach synthetical recovery marine main engine waste heat, significantly improve the thermal efficiency of diesel engine, reduce boats and ships EEDI energy consumption index.
Description
Technical field
What the present invention relates to is a kind of bootstrap system, especially a kind of residual neat recovering system of marine low speed diesel engine.
Background technique
Energy problem is own through becoming a first-class major issue in economic development.Boats and ships are means of transportation that energy-output ratio is huge, and high energy consumption makes vessel motion cost increase on the one hand, also bring serious environmental problem to vessel motion on the other hand.How effectively to reduce boats and ships energy consumption is a reality and great problem.International Maritime Organization IMO is own by EEDI (Energy EfficiencyDesign Index, new ship Energy design index) as an examination Ship Design energy consumption index just, boats and ships energy utilization efficiency is low, except by the face of great number fuel cost except, also by the face of extra fine, to compensate the destruction to environment.Diesel engine as the major impetus of boats and ships, its thermal efficiency oneself close to 50%, but still have that the energy of 50% is vented, cooling medium is taken away.If the heat of main exhaust and cooling water can be utilized to carry out generating electricity or providing steam as supplementary equipment thermal source, then can Substitute For Partial subsidiary engine and donkey boiler, the effect reaching energy-conservation simultaneously and reduce discharging.How utilizing further and excavating this part waste heat is problem to be solved by this invention.
All adopt conventional exhaust heat boiler in the marine main engine bootstrap system of each main marine main engine manufacturing company exploitation, be characterized in the waste heat for generating steam utilizing main exhaust, recycle.But be limited to flue gas dew point temperature, for preventing cold end corrosion, main frame bootstrap system exhaust heat boiler temperature of exhaust fume is all more than 170 DEG C, also namely main frame bootstrap system only make use of the energy of exhaust temperature ranges 170 ~ 300 DEG C (left and right), and in exhaust, its complementary energy has all entered environment.
In the Chinese file of publication number CN102777876A (publication date on November 14th, 2012), disclose a kind of marine diesel engine genset waste gas residual heat gas production system.This system comprises hot well, boiler feed pump, drum, waste heat boiler, vaporizer and preheater.Effectively can reclaim the waste gas residual heat of generating diesel engine peculiar to vessel.This technology is the exhaust steam waste heat utilization for marine diesel engine genset, does not relate to the UTILIZATION OF VESIDUAL HEAT IN of ship's main diesel engine.
In the patent document of publication number CN103111172A (publication date on May 22nd, 2013), disclose a kind of marine main engine heat recovery exhaust treatment system and method, comprise waste heat boiler, steam turbine, generator, carbon dioxide absorption tower, water pump, water tank, horizontal ammonia convertor, alkane cracking device and deaerator.Namely can efficiency utilization marine main engine waste heat, carbon dioxide in tail gas can be absorbed again, reduce carbon emission.This technological scheme is the oxygen and the nitrogen that utilize deaerator air separation to be become high concentration, the oxygen of high concentration carries out oxygen-enriched combusting heating boiler vaporizer at waste heat boiler and diesel exhaust and produces high-temperature steam, driving steam turbine generates electricity, and realizes utilizing marine engine exhaust heat; And hydrogen synthetic ammonia in horizontal ammonia convertor that the nitrogen of high concentration and cracking alkane device produce, make ammoniacal liquor in carbon dioxide absorption tower, generate carbonic hydroammonium with carbon dioxide in diesel exhaust, realize carbon dioxide capture.UTILIZATION OF VESIDUAL HEAT IN relates to exhaust heat boiler and steam turbine, does not relate to the exhaust overbottom pressure of ship's main diesel engine and the UTILIZATION OF VESIDUAL HEAT IN of air-cooled heat exchanger and jacket water energy.
In the patent document of publication number CN102777221A (publication date on November 14th, 2012), disclose a kind of marine diesel engine genset power generation system using waste heat based on organic Rankine bottoming cycle, the vaporizer comprising waste heat boiler, organic working medium decompressor, retarder, alternator, regenerator, condenser, organic working medium suction booster and be arranged in waste heat boiler.Effectively can reclaim the waste gas residual heat of generating diesel engine peculiar to vessel.This technology utilizes for the exhaust heat of marine diesel engine genset, adopts the generating of organic working medium decompressor, do not relate to the UTILIZATION OF VESIDUAL HEAT IN of ship's main diesel engine.
In " thermal equilibrium analysis of the large ship main frame device for recovering heat energy from waste gas " literary composition published in " Marine engineering " 2009Vol.31, describe the fundamental diagram system of external marine main engine Sulzer12RT2flex96C heat energy from waste gas reclaiming system, and thermal equilibrium analysis is carried out to UTILIZATION OF VESIDUAL HEAT IN system.Relate to marine main engine exhaust heat boiler, two pressure steam turbine and power turbine in Sulzer12RT2flex96C heat energy from waste gas reclaiming system schematic diagram, but do not relate to the combination exhaust heat boiler organic working medium vaporizer and organic working medium turbine LP rotors that reclaim delivery temperature energy below 170 DEG C.
" marine vehicle diesel residual heat utilizes technical research " one of publication describes a kind of marine main engine MAN6S50ME-C bootstrap system in literary composition in " diesel engine " (2012Vol.34), and carries out thermal equilibrium analysis to UTILIZATION OF VESIDUAL HEAT IN system.This bootstrap system is by ultralow temperature exhaust heat boiler, two pressure steam turbine and power turbine and organic working medium turbine LP rotors.Ultralow temperature exhaust heat boiler is made up of the water heater of high-pressure superheater, high pressure evaporator, low pressure evaporator and recovery delivery temperature energy below 170 DEG C.Boiler flue gas outlet temperature is 95 DEG C.Boiler feed water comes to collecting annulus, and the high temperature section flowing through main engine jacket water-to-water heat exchanger and two-stage air cooling device is respectively heated to 160 DEG C, and a part directly enters high pressure drum, and another part enters low pressure cooker cylinder after mixing with the feedwater out of jacket water heat exchanger.
In MAN6S50ME-C bootstrap system in literary composition, cryogenic exhausting exhaust heat boiler utilizes water heater to reclaim exhaust energy below 170 DEG C for organic working medium vaporizer, organic working medium vaporizer directly not to be replaced water heater.Boiler feed water total amount is about 4t/h, does not fully recycle the energy of jacket water and air cooling device high temperature air.In literary composition, power generating equipment is two pressure steam turbine and power turbine, with organic working medium turbine LP rotors, but do not relate to two pressure turbine LP rotors, power turbine generator set and the modular design of organic working medium turbine LP rotors, do not relate to the control of auxiliary system, bootstrap system yet.
In MAN6S50ME-C bootstrap system in literary composition, organic working medium turbine generating system is made up of vaporizer, organic working medium steam turbine, vapour condenser and generator.Be heated to 140 DEG C of hot water by boiler hot hydrophone and flow through vaporizer, produce the organic working medium steam of High Temperature High Pressure, enter the acting of organic working medium steam turbine, drive electrical power generators.Organic working medium is isobutane.And cryogenic exhausting exhaust heat boiler water heater and organic working medium turbine LP rotors are arranged to an independent loop, also limit the recycling of jacket water and air cooling device waste heat.Do not relate to jacket water and air cooling device organic working medium heat exchanger.
Summary of the invention
The object of the present invention is to provide a kind of marine low speed diesel residual heat comprehensive recovery system that effectively can improve marine low speed diesel power systems energy utilization efficiency.
The object of the present invention is achieved like this:
Comprise combination afterheat boiler system, power turbine power generation system, turbine generating system, high-temperature cooling water utilize heat transmission equipment and organic working medium turbine generating system;
The water pipe type forced circulation boiler of the horizontal positioned forced heat exchanging heating surface of the vertical flue with bypass flue that described combination afterheat boiler system is made up of conventional exhaust heat boiler section and organic working medium vaporizer section;
Diesel exhaust gas point two-way in diesel engine gas collecting box flows through turbosupercharger and power turbine power generation system respectively, flow through conventional exhaust heat boiler section and the organic working medium vaporizer section of combination afterheat boiler system after two-part exhaust mixing successively, and enter air through combination heat boiler outlet flue;
The jacket-cooling water of diesel engine is cooled by jacket water heat exchanger, collecting annulus is as circulating water water source, circulating water passes through jacket water heat exchanger after feed water pump boosting, the hot water that jacket water heat exchanger exports is divided into two-way, one tunnel enters the high-temperature heat-exchanging of segmented air-cooled heat exchanger, another road inputs conventional exhaust heat boiler section after directly mixing with the part in the water outlet of segmented air-cooled heat exchanger, and the another part in the water outlet of segmented air-cooled heat exchanger directly externally exports;
The steam turbine of the steam supply turbine generating system that conventional exhaust heat boiler section produces, the exhaust steam after acting enters condenser, boosts to collecting annulus after being condensed by condensate pump;
Organic working medium vaporizer section and organic working medium turbine generating system form and circulate.
The present invention can also comprise:
1, described segmented air-cooled heat exchanger is 3 stops air-cooled heat exchanger, namely high-temperature heat-exchanging, mid temperature heat exchanger and cryogenic heat exchanger is comprised, also comprise the jacket water organic working medium preheater in parallel with jacket water heat exchanger, the organic working medium going out organic working medium turbine generating system enters mid temperature heat exchanger and is entering organic working medium vaporizer section after jacket water organic working medium preheater.
2, conventional exhaust heat boiler section is two pressure boilers, i.e. saturated vapour and superheated vapor, overheated evaporator outlet connects and is used for temperature controlled HP steam drum, and the branched pipe on the saturated vapour entrance pipe of superheater is connected with the desuperheater on superheater superheated vapor export pipeline.
3, described Turbo-generator Set is two pressure filling condensing steam turbine generator groups, and its pair of pressure filling condensing steam turbine body, speed reducer and supplementary equipment and the 3rd generator are integrated on public base, and condenser is underlying.
4, the power turbine of described power turbine generator set, second gear-box and the second generator are integrated on public base, lubrication and cooling system is underlying, power turbine, second gear-box and the second generator are by same petrol station centralized oil supply, the import of power turbine is connected by pipeline with diesel exhaust gas header, power turbine exhaust outlet is connected by pipeline with combination exhaust-heat boiler flue gas entrance, power turbine air intake control valve group is made up of three valves and two throttle reducing transformers, three valves are urgent bypass valve, quick-closing valve and Flow-rate adjustment bypass valve, urgent bypass valve is connected with first throttle step down transformer, Flow-rate adjustment bypass valve and the second throttling decompressor.
5, organic turbine body of described organic working medium Turbo-generator Set, the 4th gear-box and the 4th generator and condenser, liquid collecting tank, organic working medium pressurize pump and auxiliary system are integrated on a public base.
Compared with prior art, the present invention has following beneficial effect:
(1) have employed combination exhaust heat boiler, more can reclaim delivery temperature exhaust energy below 170 DEG C, expand UTILIZATION OF VESIDUAL HEAT IN scope and waste heat amount can be utilized.
(2) low-grade thermal energy is become high-grade electric energy with the combination of organic working medium turbine LP rotors by the organic working medium vaporizer combined in exhaust heat boiler.
(3) have employed combination exhaust heat boiler, the pollutant carried in flue gas is as NOx, SOx and CO
2deng, to combine with water of condensation in the back-end ductwork of combination exhaust heat boiler and generate corresponding acid, and discharge from discharge pipe along with water of condensation, be conducive to emission control.
(4) parameter matching of diesel engine, power turbine and combination exhaust heat boiler is achieved to greatest extent.
(5) power turbine, steam turbine, organic working medium turbine generating system are combined with combination the organic of exhaust heat boiler, can realize the comprehensive utilization of marine low speed diesel residual heat.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the first mode of execution of marine low speed diesel residual heat comprehensive recovery system of the present invention.
Fig. 2 is the schematic diagram of the second mode of execution of marine low speed diesel residual heat comprehensive recovery system of the present invention.
Embodiment
Below in conjunction with drawings and Examples, marine low speed diesel residual heat comprehensive recovery system of the present invention is further described:
The object of the invention is to improve marine low speed diesel power systems energy utilization efficiency.For reaching this purpose, take into full account the utilization of marine low speed diesel exhaust gas less than 170 DEG C energy, comprehensive raising ship's main diesel engine UTILIZATION OF VESIDUAL HEAT IN potentiality, propose the guiding theory of overall plan of the present invention.
Marine low speed diesel residual heat of the present invention utilizes system mainly to consist of the following components: the organic working medium turbine generating system that the combination afterheat boiler system of recovery marine low speed diesel engine exhaust waste heat, the power turbine power generation system utilizing multiple exhaust energy to do work, the turbine generating system utilizing steam to do work, marine low speed diesel engine high-temperature cooling water utilize heat transmission equipment, utilize low-quality energy to do work.This few part system utilizes pipeline to couple together, and working medium circulates betwixt, constitutes transmission and the callback course of whole marine low speed diesel power systems waste heat energy.
Described marine low speed diesel residual heat utilizes system, considers cost-benefit situation, can be applicable on the marine low speed diesel power systems of 9, more than 000kW power.This bootstrap system utilizes the energy of marine low speed diesel exhaust gas, air cooling device and jacket water with the form of generating.
Described marine low speed diesel exhaust gas temperature is under substantially not reducing diesel engine performance prerequisite, by revising diesel engine timing and again mating diesel pressure booster, current high-power low-speed diesel delivery temperature is suitably improved, when making diesel engine power be greater than 50%, can be power turbine power generation system and exhaust energy is provided, and diesel pressure booster still can within the scope of full working scope stable operation, improve the utilization rate of waste heat of boiler simultaneously.
The water pipe type forced circulation boiler of the horizontal positioned forced heat exchanging heating surface of the vertical flue with bypass flue that described combination exhaust heat boiler 10 is made up of with organic working medium vaporizer section 11 conventional exhaust heat boiler section 12.Split is adopted to arrange the form of conventional exhaust heat boiler section 12 and organic working medium vaporizer section 11 or integrated type arrangement combinations exhaust heat boiler.The tube bank of organic working medium vaporizer adopts corrosion resisting steel.
Described combination exhaust heat boiler feed-water preheating adopts jacket-cooling water and pressurized air heat stepwise technology.Conventional exhaust heat boiler section 12 feed water preheater is made up of the jacket water heat exchanger 64 of diesel engine and the high-temperature heat-exchanging 23 of 3 stops air cooling device.Redesign former for diesel engine pressurized air air-cooled heat exchanger for high temperature, middle gentle low temperature 3 stops air cooling device, air cooling device high-temperature heat-exchanging is used for the feed-water preheating of conventional exhaust heat boiler section 12.
Described two pressure filling condensing steam turbine generator groups 30, its pair of pressure filling condensing steam turbine body 31, speed reducer 32 and supplementary equipment and generator 33 are integrated on public base, and condenser 34 is underlying, forms an electricity generation module.
Described power turbine generator set 40, its power turbine 41, gear-box 42 and generator 43, comprise all component integrations such as air intake control valve group on public base, lubrication and cooling system is underlying, forms an electricity generation module.Power turbine, gear-box and generator are by same petrol station centralized oil supply.Single-stage power turbine or two-stage series connection power turbine and gear-box integrate.Import and the low-speed diesel engine of power turbine are vented header and are connected by pipeline, and power turbine exhaust outlet is connected by pipeline with ultralow temperature exhaust-heat boiler flue gas entrance.Power turbine air intake control valve group is made up of three valves and two throttle reducing transformers.Three valves are urgent bypass valve 44, quick-closing valve 45 and Flow-rate adjustment bypass valve 46.Urgent bypass valve 44 is connected with throttle reducing transformer 47, and Flow-rate adjustment bypass valve 46 is connected with expenditure and pressure device 48.Quick-closing valve and Flow-rate adjustment bypass valve, by controlling power turbine generated output, ensure that exhaust pressure is identical with low-speed diesel engine pressurized machine final vacuum pressure, and power turbine delivery temperature meets the requirement that main exhaust mixes temperature simultaneously.
Described organic working medium Turbo-generator Set 50, its organic turbine body 51, gear-box 52 and generator 53 is integrated on a public base with condenser 54, liquid collecting tank 55, organic working medium pressurize pump 56 and auxiliary system, forms an electricity generation module.When adopting organic working medium R245fa, the working pressure ~ 1.1MPa of organic working medium steam turbine, exhaust steam pressure 0.2 ~ 0.3MPa; When organic working medium is R236 and R601a, working pressure and exhaust pressure respective change.Organic working medium vaporizer 11 is connected with conventional exhaust heat boiler section, forms combination exhaust heat boiler, directly reclaims the energy that low-speed diesel engine is vented less than 170 DEG C; Organic working medium preheater is made up of the mid temperature heat exchanger of 3 stops air cooling device and jacket water organic working medium preheater, absorbs the energy of air cooling device and jacket water.
Described subsystem, comprise a jacket water organic working medium preheater 62, the modulating valve group that a jacket water heat exchanger 64 and a jacket water cooler 65, one group of flow, temperature and pressure control and regulate, a steam turbine water of condensation collecting annulus 60 and pump group 61 etc.It is characterized in that: jacket water cooler 65 is the original jacket water coolers of low-speed diesel engine; Described jacket water organic working medium preheater 62 and jacket water heat exchanger 64 are by pipeline and valve 63,67 in parallel, and both are connected on main frame original jacket water cooler 65 system circuit, adopt the mode of throttling or shunting to realize heat exchange and jacket water water temperature controls; The high-temperature heat-exchanging 23 of jacket water heat exchanger 64,3 stops air cooling device couples together with the feedwater of low-pressure drum 16 by described regulating and controlling valve group 68,69 and 72, realizes the mixed gentle flow control of low-pressure drum 16 feedwater; Valve 69,70,75 is low-pressure drum, HP steam drum and organic working medium evaporator flow modulating valve; By throttle down 63,66 and 67, jacket water can be realized when low operating mode and carry out short circle without three heat exchangers, guarantee main engine jacket water maintenance work temperature; From 30% operating mode, by throttle down 73, realize jacket water and first flow through jacket water organic working medium preheater 62, bootstrap system jacket water heat exchanger 64, for bootstrap system provides the 80 DEG C of organic working medium undersaturated liquids and hot water requiring flow; If jacket water outlet temperature still higher than main frame cooling regulation require inlet temperature time, undertaken controlling and regulating by valve 66 and 74, jacket water flow through main frame original jacket water cooler 65 laggard enter main frame.
The first mode of execution of the present invention is further described below in conjunction with Fig. 1.
Combination exhaust heat boiler is made up of with organic working medium vaporizer section 11 conventional exhaust heat boiler section 12, is three pressure boilers; Conventional exhaust heat boiler section 12 utilizes the energy of exhaust temperature ranges 170 ~ 300 DEG C, and organic working medium vaporizer section 11 utilizes the energy of exhaust temperature ranges 100 ~ 170 DEG C, the exhaust exit temperature of combination exhaust heat boiler 10 is made to control, at ~ 100 DEG C, to run across acid dew point.Conventional exhaust heat boiler section is two pressure boilers, i.e. saturated vapour and superheated vapor, and for steam turbine power generation, its feed water preheater is made up of the jacket water heat exchanger 64 of diesel engine and the high-temperature heat-exchanging 23 of 3 stops air-cooled heat exchanger.Superheated vapor outlet temperature controls to adopt HP steam drum 17 saturated steam attemperation to control, and being connected with the desuperheater 19 on superheater superheated vapor export pipeline by the branched pipe 18 on superheater 15 saturated vapour entrance pipe is realized.Organic working medium vaporizer section 11 is connected with conventional exhaust heat boiler section 12, produce the vapour source of 90-95 DEG C of organic working medium steam as organic working medium Turbo-generator Set, organic working medium preheater is made up of the mid temperature heat exchanger 22 of 3 stops air-cooled heat exchanger, jacket water organic working medium preheater 62.Reclaim low grade heat energy as much as possible, improve the generated energy of organic working medium turbine LP rotors.
Diesel exhaust gas after adjustment point two-way in diesel engine gas collecting box flows through pressurized machine and power turbine respectively, and the air displacement entering power turbine accounts for 10% of diesel exhaust gas amount.Power turbine exhaust exit temperature, higher than supercharger outlet delivery temperature 20 to 30 DEG C, is vented the mixed pressurized machine final vacuum temperature of ginseng by power turbine, improves boiler smoke inlet temperature.After two-part exhaust mixing, flow through combination exhaust heat boiler high-pressure superheater 15, high pressure evaporator 14, low pressure evaporator 13 and organic working medium vaporizer 11 successively, and enter air through combination heat boiler outlet flue, its row's temperature is at ~ 100 DEG C.
Utilize collecting annulus 60 as circulating water water source, temperature is risen to about 80 DEG C by jacket water heat exchanger 64 after feed water pump 61 boosts after, be divided into two-way.After temperature is risen to about 160 DEG C by the high-temperature heat-exchanging 23 that one tunnel enters 3 stops air-cooled heat exchanger 20, hot water is divided into three parts.First portion supplies high-temperature-hot-water through valve 71 outside system, is used as daily heating, directly enters collecting annulus 60 after heat exchange; Second portion enters HP steam drum 17 through flow control valve 70, after high pressure hot water circulating pump boosting, enters high pressure evaporator 14 and high-pressure superheater 15 is heated to form superheated vapor, enters steam turbine 31 and do work after saturated steam attemperation; Part III passes through another road hot water of valve 72 flow control and jacket water heat exchanger 64, through valve 68 regulating flow, form 138 DEG C of high-temperature-hot-waters after mixing heat release and enter low-pressure drum 16, and be heated to form saturated vapour aqueous mixtures by flowing to low pressure evaporator 13 after the boosting of low pressure hot water recycle pump, then flow in low-pressure drum, through the saturated vapour that low-pressure drum carbonated drink is separated, do work for steam turbine 31 filling.Exhaust steam after the acting of filling condensing steam turbine enters condenser 34, boosts to collecting annulus 60 after being condensed by condensate pump 35.
For guaranteeing that marine low speed diesel engine system normally works, the design of jacket water cooling circuit be thought of as jacket water organic working medium preheater 62 in parallel with jacket water heat exchanger 64 after be connected on the system circuit of the original jacket water cooler 65 of low-speed diesel engine again, realize heat exchange by the mode of the switch control rule three flow of pipeline and valve and jacket water water temperature controls; When low operating mode by throttle down 63,66 and 67, Open valve 73 and 74, can realize jacket water and carry out short circle without three heat exchangers, guarantee main engine jacket water maintenance work temperature; From 30% operating mode, by throttle down 73, Open valve 63,66 and 67, realizes jacket water through stream jacket water organic working medium preheater 62, for organic working medium vaporizer provides the 80 DEG C of liquid requiring flow; Jacket water through stream jacket water heat exchanger 64, for bootstrap system provides the 80 DEG C of hot water requiring flow; If jacket water outlet temperature still require higher than main frame cooling regulation inlet temperature time, undertaken controlling and regulating by valve 66 and 74, ensure jacket water flow through main frame original jacket water cooler 65 laggard enter the water temperature of main frame control in regulation scope.
The present invention can reclaim the heat energy in marine low speed diesel exhaust gas, air cooling device and jacket water to greatest extent, and is converted into high-grade electric energy, can reach good emission reduction effect.
Fig. 2 gives the second mode of execution of the present invention.Compared with the first mode of execution shown in Fig. 1, difference part is that the organic working medium vaporizer 11 combining exhaust heat boiler forms an independent loop with organic working medium Turbo-generator Set.Supercooled state organic working medium, as systemic circulation pump, is directly pumped into combination boiler organic working medium vaporizer by organic working medium compression pump 56, saves diesel air cooler mid temperature heat exchanger 22 and jacket water organic working medium preheater 62.
Air cooling device is two section type air cooling device in addition, i.e. air cooling device high-temperature heat-exchanging 23 and cryogenic heat exchanger 21; Jacket water retains cylinder sleeve water-to-water heat exchanger 64 and jacket water cooler 65.Although comparatively Fig. 1 system is low for the waste heat energy recovery rate of air cooling device and jacket water, bootstrap system is relatively simple.
Claims (1)
1. a marine low speed diesel residual heat comprehensive recovery system, comprises combination afterheat boiler system, power turbine power generation system, turbine generating system, high-temperature cooling water utilizes heat transmission equipment and organic working medium turbine generating system; It is characterized in that:
Described combination afterheat boiler system is made up of conventional exhaust heat boiler section (12) and organic working medium vaporizer section (11), is three pressure boilers, conventional exhaust heat boiler section (12) utilizes the energy of exhaust temperature ranges 170 ~ 300 DEG C, organic working medium vaporizer section (11) utilizes the energy of exhaust temperature ranges 100 ~ 170 DEG C, makes the exhaust exit temperature of combination exhaust heat boiler (10) control running across acid dew point, conventional exhaust heat boiler section is two pressure boilers, i.e. saturated vapour and superheated vapor, for steam turbine power generation, conventional exhaust heat boiler section feed water preheater is made up of the jacket water heat exchanger (64) of diesel engine and the high-temperature heat-exchanging (23) of 3 stops air-cooled heat exchanger, superheated vapor outlet temperature controls to adopt HP steam drum (17) saturated steam attemperation to control, to be connected with the desuperheater (19) on superheater superheated vapor export pipeline by the branched pipe (18) on superheater (15) saturated vapour entrance pipe and to realize, organic working medium vaporizer section (11) is connected with conventional exhaust heat boiler section (12), produce the vapour source of 90-95 DEG C of organic working medium steam as organic working medium Turbo-generator Set, organic working medium preheater is by the mid temperature heat exchanger (22) of 3 stops air-cooled heat exchanger, jacket water organic working medium preheater (62) forms,
Diesel exhaust gas point two-way in diesel engine gas collecting box flows through pressurized machine and power turbine respectively, the air displacement entering power turbine accounts for 10% of diesel exhaust gas amount, power turbine exhaust exit temperature is higher than supercharger outlet delivery temperature 20 to 30 DEG C, after two-part exhaust mixing, flow through combination exhaust heat boiler high-pressure superheater (15), high pressure evaporator (14), low pressure evaporator (13) and organic working medium vaporizer (11) successively, and enter air through combination heat boiler outlet flue;
Collecting annulus (60) is as circulating water water source, two-way is divided into temperature is risen to 80 DEG C by jacket water heat exchanger (64) after feed water pump (61) boosting after, temperature is risen to 160 DEG C of after heat moisture and becomes three parts by the high-temperature heat-exchanging (23) that one tunnel enters 3 stops air-cooled heat exchanger (20), first portion supplies high-temperature-hot-water through the first valve (71) outside system, directly enters collecting annulus (60) after heat exchange, second portion enters HP steam drum (17) through flow control valve (70), after high pressure hot water circulating pump boosting, enter high pressure evaporator (14) and high-pressure superheater (15) is heated to form superheated vapor, after saturated steam attemperation, enter steam turbine (31) acting, Part III passes through another road hot water of (72) flow control of the second valve and jacket water heat exchanger (64), through the 3rd valve (68) regulating flow, form 138 DEG C of high-temperature-hot-waters after mixing heat release and enter low-pressure drum (16), and be heated to form saturated vapour aqueous mixtures by flowing to low pressure evaporator (13) after the boosting of low pressure hot water recycle pump, then flow in low-pressure drum, through the saturated vapour that low-pressure drum carbonated drink is separated, for steam turbine (31) filling acting, exhaust steam after the acting of filling condensing steam turbine enters condenser (34), collecting annulus (60) is boosted to by condensate pump (35) after being condensed,
Be connected on the system circuit of the original jacket water cooler (65) of low-speed diesel engine after jacket water organic working medium preheater (62) is in parallel with jacket water heat exchanger (64) again, realize heat exchange by the mode of the switch control rule three flow of pipeline and valve and jacket water water temperature controls; When low operating mode by closedown the 4th valve (63), the 5th valve (66) and the 6th valve (67), open the 7th valve (73) and the 8th valve (74), realize jacket water and carry out short circle without three heat exchangers; From 30% operating mode, by closing the 7th valve (73), open the 4th valve (63), the 5th valve (66) and the 6th valve (67), realize jacket water through stream jacket water organic working medium preheater (62), for organic working medium vaporizer provides the 80 DEG C of liquid requiring flow; Jacket water through stream jacket water heat exchanger (64), for bootstrap system provides the 80 DEG C of hot water requiring flow; If when jacket water outlet temperature still specifies higher than main frame cooling the inlet temperature required, undertaken controlling and regulating by the 5th valve (66) and the 8th valve (74), ensure jacket water flow through main frame original jacket water cooler (65) laggard enter the water temperature of main frame control in regulation scope.
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