CN103967648A - Comprehensive waste heat recovery system of ship low-speed diesel engine - Google Patents
Comprehensive waste heat recovery system of ship low-speed diesel engine Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 239000002918 waste heat Substances 0.000 title abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000010248 power generation Methods 0.000 claims abstract description 18
- 239000000498 cooling water Substances 0.000 claims abstract description 9
- 239000006200 vaporizer Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 16
- 229920006395 saturated elastomer Polymers 0.000 claims description 10
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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 invention provides a comprehensive waste heat recovery system of a ship low-speed diesel engine. The comprehensive waste heat recovery system comprises a combined waste heat boiler system, a power turbine power generation system, a steam turbine power generation system, high-temperature cooling water utilization and heat exchange equipment and an organic working medium steam turbine power generation system. Waste heat energy of exhaust of the ship low-speed diesel engine is effectively recycled through a combined waste heat boiler. Waste heat of ship low-speed diesel engine cylinder jacket cooling waste and pressurized air air-cooling heat exchanger cooling water are effectively recycled through a cylinder jacket heat exchanger and a three-section type air-cooling heat exchanger. Exhaust pressure energy is recycled through a power turbine, and hot water energy of the boiler and an air-cooling heat exchanger is recycled through a low-temperature steam turbine. The energy is converted into electric energy, so that waste heat of the ship main engine is comprehensively recycled, heat efficiency of the diesel engine is remarkably improved, and the EEDI energy consumption index of a ship is decreased.
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 oneself in becoming economic development a first-class major issue.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 to vessel motion, has brought serious environmental problem on the other hand.How effectively reducing 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 facing the fuel cost of great number, also by facing extra fine, to compensate the destruction to environment.Diesel engine is as the major impetus of boats and ships, and oneself approaches 50% its thermal efficiency, but still have, 50% energy is deflated, cooling medium is taken away.If can utilize the heat of main exhaust and cooling water to generate electricity or provide steam as supplementary equipment thermal source, can Substitute For Partial subsidiary engine and donkey boiler, reach effect energy-conservation and that reduce discharging simultaneously.How further utilizing and excavating this part waste heat is problem to be solved by this invention.
In the marine main engine bootstrap system of each main marine main engine manufacturing company exploitation, all adopt conventional exhaust heat boiler, be characterized in utilizing the waste heat for generating steam of 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, all more than 170 ℃, is also that main frame bootstrap system has only utilized the energy of delivery temperature scope 170～300 ℃ (left and right), and in exhaust, its complementary energy has all entered environment.
In the Chinese file of publication number CN102777876A (open day on November 14th, 2012), a kind of marine diesel engine genset waste gas residual heat gas production system is disclosed.This system comprises hot well, boiler feed pump, drum, waste heat boiler, vaporizer and preheater.Can effectively 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 (open day on May 22nd, 2013), disclose a kind of marine main engine heat recovery exhaust treatment system and method, comprised waste heat boiler, steam turbine, generator, carbon dioxide absorption tower, water pump, water tank, horizontal ammonia convertor, alkane cracking device and deaerator.Can efficiently utilize marine main engine waste heat, can absorb carbon dioxide in tail gas again, reduce carbon emission.This technological scheme is to utilize deaerator air separation to be become to oxygen and the nitrogen of high concentration, the oxygen of high concentration carries out oxygen-enriched combusting heating boiler vaporizer generation high-temperature steam at waste heat boiler and diesel exhaust, driving steam turbine generating, realizes marine engine exhaust heat is utilized; 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 with diesel exhaust in carbon dioxide generate carbonic hydroammonium, realize carbon dioxide capture.In UTILIZATION OF VESIDUAL HEAT IN, relate to exhaust heat boiler and steam turbine, do 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 (open day on November 14th, 2012), disclose a kind of marine diesel engine genset power generation system using waste heat based on organic Rankine circulation, comprised waste heat boiler, organic working medium decompressor, retarder, alternator, regenerator, condenser, organic working medium suction booster and be arranged on the vaporizer in waste heat boiler.Can effectively reclaim the waste gas residual heat of generating diesel engine peculiar to vessel.This technology is the exhaust heat utilization for marine diesel engine genset, adopts the generating of organic working medium decompressor, does not relate to the UTILIZATION OF VESIDUAL HEAT IN of ship's main diesel engine.
In " thermal equilibrium analysis of large ship main frame device for recovering heat energy from waste gas " literary composition of publishing in < < Marine engineering > > 2009Vol.31, introduced the fundamental diagram system of external marine main engine Sulzer12RT2flex96C heat energy from waste gas reclaiming system, and UTILIZATION OF VESIDUAL HEAT IN system has been carried out to thermal equilibrium analysis.In Sulzer12RT2flex96C heat energy from waste gas reclaiming system schematic diagram, relate to marine main engine exhaust heat boiler, two pressure steam turbine and power turbine, but relate to, do not reclaim delivery temperature at combination exhaust heat boiler organic working medium vaporizer and the organic working medium steam turbine power generation unit of energy below 170 ℃.
In < < diesel engine > > (2012Vol.34), in " marine vehicle diesel residual heat utilizes technical research " literary composition of publication, introduced a kind of marine main engine MAN6S50ME-C bootstrap system, and UTILIZATION OF VESIDUAL HEAT IN system has been carried out to thermal equilibrium analysis.This bootstrap system is by ultralow temperature exhaust heat boiler, two pressure steam turbine and power turbine and organic working medium steam turbine power generation unit.By high-pressure superheater, high pressure evaporator, low pressure evaporator and recovery delivery temperature, the water heater at energy below 170 ℃ forms ultralow temperature exhaust heat boiler.Boiler flue gas outlet temperature is 95 ℃.Boiler feed water comes to collecting annulus, and the high temperature section of flow through respectively main engine jacket water-to-water heat exchanger and two-stage air cooling device is heated to 160 ℃, 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 be utilize water heater reclaim exhaust at energy below 170 ℃ for organic working medium vaporizer, organic working medium vaporizer is not directly replaced to water heater.Boiler feed water total amount is about 4t/h, there is no fully to 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 steam turbine power generation unit, but do not relate to two press steam turbine power generation unit, power turbine generator set and the designs of organic working medium turbine generator pack moduleization, 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 comprised of vaporizer, organic working medium steam turbine, vapour condenser and generator.By boiler hot hydrophone, be heated to 140 ℃ of flow of hot water through vaporizer, produce the organic working medium steam of High Temperature High Pressure, enter the acting of organic working medium steam turbine, drive generator generating.Organic working medium is isobutane.And cryogenic exhausting exhaust heat boiler water heater and organic working medium steam turbine power generation unit are arranged to an independent loop, have also limited 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 can effectively improve marine low speed diesel powered system capacity utilization ratio.
The object of the present invention is achieved like this:
Comprise that 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 comprised of conventional exhaust heat boiler section and organic working medium vaporizer section;
Diesel exhaust gas minute two-way in diesel engine gas collecting box flow through respectively turbosupercharger and power turbine power generation system, two-part exhaust is flowed through successively after mixing and is combined conventional exhaust heat boiler section and the organic working medium vaporizer section of afterheat boiler system, and enters atmosphere through combination heat boiler outlet flue;
The jacket-cooling water of diesel engine is cooling 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 boosts, the hot water of jacket water heat exchanger output is divided into two-way, one tunnel enters the high-temperature heat-exchanging of segmented air-cooled heat exchanger, conventional exhaust heat boiler section is inputted after directly mixing with the part in the water outlet of segmented air-cooled heat exchanger in another road, and the another part in the water outlet of segmented air-cooled heat exchanger is externally output directly;
The steam turbine of the steam supply turbine generating system that conventional exhaust heat boiler section produces, the exhaust steam after acting enters condenser, after being condensed, by condensate pump, boosts to collecting annulus;
Organic working medium vaporizer section and organic working medium turbine generating system form circulation.
The present invention can also comprise:
1, described segmented air-cooled heat exchanger is 3 stops air-cooled heat exchanger, comprise high-temperature heat-exchanging, mid temperature heat exchanger and cryogenic heat exchanger, also comprise the jacket water organic working medium preheater in parallel with jacket water heat exchanger, the organic working medium that goes 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, be saturated vapour and superheated vapor, overheated evaporator outlet connects for temperature controlled high pressure 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 filling condensing steam turbine generator groups of pressing, and its pair presses filling condensing steam turbine body, speed reducer and supplementary equipment and the 3rd generator to be integrated on public base, condenser underlying.
4, the power turbine of described power turbine generator set, the second gear-box and the second generator are integrated on public base, the underlying of lubrication and cooling system, power turbine, the 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 comprised 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 feedwater compression pump and auxiliary system are integrated on a public base.
Compared with prior art, the present invention has following beneficial effect:
(1) adopted combination exhaust heat boiler, can more reclaim delivery temperature at exhaust energy below 170 ℃, expanded UTILIZATION OF VESIDUAL HEAT IN scope and can utilize waste heat amount.
(2) the organic working medium vaporizer in combination exhaust heat boiler and the combination of organic working medium steam turbine power generation unit are transformed into high-grade electric energy by low-grade heat energy.
(3) adopted combination exhaust heat boiler, the pollutant carrying in flue gas is as NOx, SOx and CO
2deng, in the back-end ductwork of combination exhaust heat boiler with water of condensation in conjunction with generating corresponding acid, and along with water of condensation is discharged from discharge pipe, be conducive to emission control.
(4) realized to greatest extent the parameter matching of diesel engine, power turbine and combination exhaust heat boiler.
(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 powered system capacity utilization ratio.For reaching this purpose, take into full account the utilization of 170 ℃ of following energy of marine low speed diesel exhaust gas, comprehensively improve ship's main diesel engine UTILIZATION OF VESIDUAL HEAT IN potentiality, the guiding theory of overall plan of the present invention has been proposed.
Marine low speed diesel residual heat of the present invention utilizes system mainly to consist of the following components: reclaim marine low speed diesel exhaust gas waste heat combination afterheat boiler system, utilize the acting of multiple exhaust energy power turbine power generation system, utilize turbine generating system, the marine low speed diesel engine high-temperature cooling water that steam does work to utilize heat transmission equipment, utilize the organic working medium turbine generating system of low-quality energy acting.These a few part systems utilize pipeline to couple together, and working medium circulates betwixt, have formed transmission and the callback course of whole marine low speed diesel powered system waste heat energy.
Described marine low speed diesel residual heat utilizes system, considers cost-benefit situation, can be applicable in the marine low speed diesel powered system of the above power of 9,000kW.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 substantially not reduce under diesel engine performance prerequisite, by revising diesel engine, regularly and again mate diesel pressure booster, current high-power low-speed diesel delivery temperature is suitably improved, while making diesel engine power be greater than 50%, can be power turbine power generation system exhaust energy is provided, and diesel pressure booster still can be in full condition range 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 comprised of conventional exhaust heat boiler section 12 and organic working medium vaporizer section 11.Adopt split 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 is to adopt jacket-cooling water and pressurized air heat stepwise technology.Conventional exhaust heat boiler section 12 feed water preheaters are comprised of the jacket water heat exchanger 64 of diesel engine and the high-temperature heat-exchanging 23 of 3 stops air cooling device.The former pressurized air air-cooled heat exchanger of diesel engine is redesigned as high temperature, middle gentle low temperature 3 stops air cooling device, and air cooling device high-temperature heat-exchanging is for the feed-water preheating of conventional exhaust heat boiler section 12.
Described two filling condensing steam turbine generator groups 30 of pressing, its pair presses filling condensing steam turbine body 31, speed reducer 32 and supplementary equipment and generator 33 to be integrated on public base, and condenser 34 underlyings, form an electricity generation module.
Described power turbine generator set 40, its power turbine 41, gear-box 42 and generator 43, comprise that all component integrations such as air intake control valve group are on public base, the underlying of lubrication and cooling system, 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.The import of power turbine is connected by pipeline with low-speed diesel engine exhaust header, 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 comprised 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, guarantee that exhaust pressure is identical with low-speed diesel engine pressurized machine final vacuum pressure, and power turbine delivery temperature meets the mixed warm requirement of main exhaust simultaneously.
Described organic working medium Turbo-generator Set 50, its organic turbine body 51, gear-box 52 and generator 53 are integrated on a public base with condenser 54, liquid collecting tank 55, organic working medium feedwater compression pump 56 and auxiliary system, form an electricity generation module.While 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 170 ℃ of following energy of low-speed diesel engine exhaust; Organic working medium preheater is comprised of mid temperature heat exchanger and the jacket water organic working medium preheater of 3 stops air cooling device, 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 of use is controlled and regulated to a jacket water heat exchanger 64 and 65, one groups of flows of a jacket water cooler, temperature and pressure, 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 is in parallel by pipeline and valve 63,67 with jacket water heat exchanger 64, and both are connected on original jacket water cooler 65 system circuits of main frame, adopts the mode of throttling or shunting to realize heat exchange and the control of jacket water water temperature; Described regulating and controlling valve group 68,69 and 72 couples together the high-temperature heat-exchanging of jacket water heat exchanger 64,3 stops air cooling device 23 and the feedwater of low-pressure drum 16, realizes the mixed gentle flow control of low-pressure drum 16 feedwater; Valve 69,70,75 is low-pressure drum, high pressure drum and organic working medium evaporator flow modulating valve; By throttle down 63,66 and 67, when low operating mode, 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, realize jacket water first flow through jacket water organic working medium preheater 62, bootstrap system jacket water heat exchanger 64, for bootstrap system provides 80 ℃ of organic working medium undersaturated liquids and the hot water that requires flow; If during the inlet temperature that jacket water outlet temperature still requires higher than the cooling regulation of main frame, controlled and regulated by valve 66 and 74, jacket water is flowed through, and the original jacket water cooler 65 of main frame is laggard enters main frame.
Below in conjunction with Fig. 1, further describe the first mode of execution of the present invention.
Combination exhaust heat boiler is comprised of with organic working medium vaporizer section 11 conventional exhaust heat boiler section 12, is three pressure boilers; Conventional exhaust heat boiler section 12 is utilized the energy of 170～300 ℃ of delivery temperature scopes, and organic working medium vaporizer section 11 is utilized the energy of 100～170 ℃ of delivery temperature scopes, the exhaust outlet temperature that makes to combine exhaust heat boiler 10 is controlled at～and 100 ℃, across acid dew point, move.Conventional exhaust heat boiler section is two pressure boilers, and saturated vapour and superheated vapor, supply steam turbine power generation, and its feed water preheater is comprised 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 control to adopt high pressure drum 17 saturated vapour attemperation controls, and realization is connected with desuperheater 19 on superheater superheated vapor export pipeline by the branched pipe 18 on superheater 15 saturated vapour entrance pipes.Organic working medium vaporizer section 11 is connected with conventional exhaust heat boiler section 12, produce 90-95 ℃ of organic working medium steam as the vapour source of organic working medium Turbo-generator Set, organic working medium preheater is comprised of mid temperature heat exchanger 22, the jacket water organic working medium preheater 62 of 3 stops air-cooled heat exchanger.Reclaim as much as possible low grade heat energy, improved the generated energy of organic working medium steam turbine power generation unit.
Diesel exhaust gas after adjusting minute two-way in diesel engine gas collecting box flow through respectively pressurized machine and power turbine, the air displacement that enters power turbine accounts for 10% of diesel exhaust gas amount.Power turbine exhaust outlet temperature, higher than 20 to 30 ℃ of supercharger outlet delivery temperatures, by the mixed pressurized machine final vacuum temperature of power turbine exhaust ginseng, improves boiler smoke inlet temperature.After two-part exhaust mixes, flow through successively combination exhaust heat boiler high-pressure superheater 15, high pressure evaporator 14, low pressure evaporator 13 and organic working medium vaporizer 11, and enter atmosphere through combination heat boiler outlet flue, its row's temperature is at～100 ℃.
Utilize collecting annulus 60 as circulating water water source, after feed water pump 61 boosts, by jacket water heat exchanger 64, temperature is risen to behind 80 ℃ of left and right, be divided into two-way.The high-temperature heat-exchanging 23 that one tunnel enters 3 stops air-cooled heat exchanger 20 rises to temperature behind 160 ℃ of left and right, and hot water is divided into three parts.First portion supplies high-temperature-hot-water outside system through valve 71, be used as daily heating, directly enters collecting annulus 60 after heat exchange; Second portion enters high pressure drum 17 through flow control valve 70, after high pressure hot water circulating pump boosts, enters high pressure evaporator 14 and high-pressure superheater 15 is heated to form superheated vapor, enters steam turbine 31 actings after saturated vapour desuperheat; Third part is by another road hot water of valve 72 flow controls and jacket water heat exchanger 64, through valve 68 regulating flows, after mixing heat release, form 138 ℃ of high-temperature-hot-waters and enter low-pressure drum 16, and after being boosted by low pressure hot water recycle pump, flow to low pressure evaporator 13 and be heated to form saturated vapour aqueous mixtures, then flow in low-pressure drum, the saturated vapour of separating through low-pressure drum carbonated drink, for steam turbine 31 filling actings.Exhaust steam after the acting of filling condensing steam turbine enters condenser 34, after being condensed, by condensate pump 35, boosts to collecting annulus 60.
For guaranteeing marine low speed diesel engine system, normally work, the design of jacket water cooling circuit is thought of as jacket water organic working medium preheater 62 and is connected on the system circuit of the original jacket water cooler 65 of low-speed diesel engine after in parallel with jacket water heat exchanger 64 again, and the mode of controlling three's flow by the switch of pipeline and valve realizes heat exchange and jacket water water temperature is controlled; 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, guarantees 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 80 ℃ of liquid that require flow; Jacket water is through stream jacket water heat exchanger 64, for bootstrap system provides 80 ℃ of hot water that require flow; If during the inlet temperature that jacket water outlet temperature still requires higher than the cooling regulation of main frame, control and regulate by valve 66 and 74, guarantee that the jacket water laggard water temperature that enters main frame of the original jacket water cooler 65 of main frame of flowing through is controlled at the scope of regulation.
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 has provided the second mode of execution of the present invention.Compare with the first mode of execution shown in Fig. 1, difference part is that the organic working medium vaporizer 11 that combines exhaust heat boiler forms an independent loop with organic working medium Turbo-generator Set.Organic working medium compression pump 56, as systemic circulation pump, directly pumps into supercooled state organic working medium combination boiler organic working medium vaporizer, 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 the waste heat energy recovery rate of air cooling device and jacket water is low compared with Fig. 1 system, bootstrap system is relatively simple.
Claims (6)
1. a marine low speed diesel residual heat comprehensive recovery system, comprises that 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; It is characterized in that:
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 comprised of conventional exhaust heat boiler section and organic working medium vaporizer section;
Diesel exhaust gas minute two-way in diesel engine gas collecting box flow through respectively turbosupercharger and power turbine power generation system, two-part exhaust is flowed through successively after mixing and is combined conventional exhaust heat boiler section and the organic working medium vaporizer section of afterheat boiler system, and enters atmosphere through combination heat boiler outlet flue;
The jacket-cooling water of diesel engine is cooling 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 boosts, the hot water of jacket water heat exchanger output is divided into two-way, one tunnel enters the high-temperature heat-exchanging of segmented air-cooled heat exchanger, conventional exhaust heat boiler section is inputted after directly mixing with the part in the water outlet of segmented air-cooled heat exchanger in another road, and the another part in the water outlet of segmented air-cooled heat exchanger is externally output directly;
The steam turbine of the steam supply turbine generating system that conventional exhaust heat boiler section produces, the exhaust steam after acting enters condenser, after being condensed, by condensate pump, boosts to collecting annulus;
Organic working medium vaporizer section and organic working medium turbine generating system form circulation.
2. marine low speed diesel residual heat comprehensive recovery system according to claim 1, it is characterized in that: described segmented air-cooled heat exchanger is 3 stops air-cooled heat exchanger, comprise high-temperature heat-exchanging, mid temperature heat exchanger and cryogenic heat exchanger, also comprise the jacket water organic working medium preheater in parallel with jacket water heat exchanger, the organic working medium that goes 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.
3. marine low speed diesel residual heat comprehensive recovery system according to claim 1 and 2, it is characterized in that: conventional exhaust heat boiler section is two pressure boilers, be saturated vapour and superheated vapor, overheated evaporator outlet connects for temperature controlled high pressure drum, and the branched pipe on the saturated vapour entrance pipe of superheater is connected with the desuperheater on superheater superheated vapor export pipeline.
4. marine low speed diesel residual heat comprehensive recovery system according to claim 1 and 2, it is characterized in that: described Turbo-generator Set is two filling condensing steam turbine generator groups of pressing, its pair presses filling condensing steam turbine body, speed reducer and supplementary equipment and the 3rd generator to be integrated on public base, condenser underlying.
5. marine low speed diesel residual heat comprehensive recovery system according to claim 1 and 2, it is characterized in that: the power turbine of described power turbine generator set, the second gear-box and the second generator are integrated on public base, the underlying of lubrication and cooling system, power turbine, the 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 comprised 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.
6. marine low speed diesel residual heat comprehensive recovery system according to claim 1 and 2, is characterized in that: 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 feedwater compression pump and auxiliary system are integrated on a public base.
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