CN111852598A - Ship waste heat recovery power generation system - Google Patents
Ship waste heat recovery power generation system Download PDFInfo
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- CN111852598A CN111852598A CN201910363894.3A CN201910363894A CN111852598A CN 111852598 A CN111852598 A CN 111852598A CN 201910363894 A CN201910363894 A CN 201910363894A CN 111852598 A CN111852598 A CN 111852598A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 32
- 238000010248 power generation Methods 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 239000000203 mixture Substances 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 238000000926 separation method Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003546 flue gas Substances 0.000 claims abstract description 16
- 238000009835 boiling Methods 0.000 claims abstract description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 31
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 42
- 229910021529 ammonia Inorganic materials 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
- F01K21/04—Steam engine plants not otherwise provided for using mixtures of steam and gas; Plants generating or heating steam by bringing water or steam into direct contact with hot gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a ship waste heat recovery power generation system. The system comprises: the main machine generates flue gas; the first heat exchange device is communicated with the main machine; the gas-liquid separation device is communicated with the first heat exchange device; the expansion machine is communicated with the steam outlet of the gas-liquid separation device and is used for generating power by utilizing the steam; the mixing device is used for mixing the dead steam which does work through expansion and the liquid of the separation device into a gas-liquid two-phase mixture; the heating system is communicated with the mixing device and is used for liquefying the mixed gas-liquid two-phase mixture into a first mixed working medium; the first mixed working medium is a mixture at least comprising two working media, wherein the boiling point of at least one working medium is lower than 100 ℃. Compared with the prior art in which water is used as a working medium, the steam for power generation can be generated under the condition of low temperature of flue gas, and the utilization rate of heat is further improved.
Description
Technical Field
The invention relates to the technical field of ship energy conservation, in particular to a ship waste heat recovery power generation system.
Background
The International Maritime Organization (IMO) establishes two ship energy efficiency standards, the "ship energy efficiency design index" (EEDI) and the "ship energy efficiency management plan" (SEEMP). This is the first mandatory legal document specifically for international maritime greenhouse gas emission reduction and has been implemented in 2013, 1 month and 1 day on international vessels sailing at 400 total tons and above with keels.
The thermal efficiency of known diesel engines is generally 45% to 50%. The cooling water takes away heat by external heat exchange by about 20-25%. The heat carried away by the exhaust gas is about 25-30%. Currently, two-stroke low speed diesel engines have the highest efficiency of all thermal engines-close to 50%, but still have more than half of the fuel energy unutilized.
The exhaust afterheat recovering power generating technology for main engine belongs to the secondary heat energy utilizing technology, and can raise the fuel oil utilizing rate and lower installed power. Therefore, the technology of generating power by using the exhaust waste heat of the marine main engine is an important technical direction for reducing CO2 emission and EEDI.
At present, steam Rankine cycle power generation and Organic Rankine Cycle (ORC) power generation are mainly used in the middle-low temperature exhaust waste heat recovery power generation mode in the industry, and different modes are applied to different fields and different occasions according to the cycle characteristics of the power generation modes. The exhaust gas of the marine diesel engine is mostly low-temperature heat sources at 260-350 ℃, and the operating load of the main engine and the exhaust parameters of the marine diesel engine change along with the change of sea conditions in the operation process of the marine diesel engine, so that the exhaust gas waste heat recovery system is easy to deviate from the design working condition. At present, ships divided abroad have a steam Rankine cycle power generation technology, and the technology has the following defects in ship exhaust waste heat recovery power generation:
(1) For a medium-low temperature heat source, water or organic matters are used as working media, water vapor or organic matter vapor is evaporated at a constant temperature, evaporation equipment is limited by node temperature difference, the temperature of exhaust cannot be reduced to an ideal range, and waste heat cannot be fully recovered;
(2) when the operation load of the main engine deviates from the design working condition of the ship waste heat recovery power generation system, the efficiency of system waste heat recovery is reduced, and waste heat cannot be fully recovered.
Aiming at the defects existing in the ship main engine waste heat recovery, the ship waste heat recovery power generation system which can recover the middle and low temperature heat sources and has higher system waste heat recovery efficiency is provided, and the technical problem to be solved is solved.
Disclosure of Invention
In order to at least partially solve the above problems, the present invention provides a ship waste heat recovery power generation system. This boats and ships waste heat recovery power generation system includes:
a main machine, which generates flue gas;
the first heat exchange device is communicated with the host and is used for exchanging heat between a first mixed working medium and the flue gas so as to heat the first mixed working medium;
the gas-liquid separation device is communicated with the first heat exchange device and is used for separating the liquid working medium and the steam generated by heating the first mixed working medium;
The expander generator set is communicated with a steam outlet of the gas-liquid separation device and is used for generating power by utilizing the steam;
the mixing device is respectively communicated with a liquid side working medium outlet of the gas-liquid separation device and an outlet of the expander generator set and is used for mixing the separated liquid working medium with the steam with the temperature and pressure reduced; and
the heating system is communicated with the mixing device and is used for condensing the mixed liquid working medium and the steam gas-liquid mixture and liquefying the gas-liquid mixture into the first mixed working medium;
the first mixed working medium is a mixture at least comprising two working media, wherein the boiling point of at least one of the working media is lower than 100 ℃.
In an optional embodiment, the liquid working medium is a mixture obtained by partially evaporating the first mixed working medium into the steam, and the steam is formed by evaporating the working medium with the lowest boiling point in the first mixed working medium.
In an optional embodiment, the first mixed working medium is ammonia water, the circulating working medium of the heating system is ammonia water with a higher concentration, and other organic working media such as R245fa, R123, R134a, R22 and the like can also be selected.
In an alternative embodiment, the heating system is disposed between the mixing device and the first heat exchange device.
In an optional embodiment, the heat exchanger further comprises a second heat exchanger, a hot side of the second heat exchanger is located between the mixing device and the heating system, and a cold side of the second heat exchanger is located between the first heat exchanger and the heating system.
In an optional embodiment, the gas-liquid separation device further comprises a third heat exchange device, wherein a hot side of the third heat exchange device is located between the gas-liquid separation device and the mixing device, and a cold side of the third heat exchange device is located between a cold side of the second heat exchange device and the first heat exchange device.
In an alternative embodiment, a pressure regulating valve is arranged between the hot side of the third heat exchange device and the mixing device, and is used for controlling the pressure of the liquid working medium input into the mixing device.
In an optional embodiment, the heating system comprises a first condenser, a compressor, a second condenser and a throttle valve which are communicated in sequence;
the first condenser is used for transferring the heat of the gas-liquid mixture to a heating agent working medium, the gas-liquid mixture is condensed into a liquid state through heat exchange, and the heating agent working medium is heated and evaporated into low-temperature and low-pressure heating agent steam;
The compressor is used for compressing the low-temperature and low-pressure heating agent steam into high-temperature and high-pressure heating agent steam;
the second condenser is used for transferring the heat of the high-temperature and high-pressure heating agent steam to water to heat the water;
the throttle valve is used for throttling and depressurizing the heating agent behind the second condenser into a low-pressure heating agent.
According to the ship waste heat recovery power generation system, the energy carried by the flue gas generated by the main engine (such as a ship diesel engine) can be fully utilized, and the defects of the waste heat recovery system in the prior art are overcome. The first mixed working medium can be used as a circulating working medium, the energy carried by the flue gas is fully recovered, the recovered heat energy is converted into electric energy, and meanwhile, the ship waste heat recovery power generation system further comprises a heating system which can utilize low-temperature waste heat which cannot be converted into the electric energy to heat and generate hot water, so that the utilization rate of the heat energy is further improved.
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
Drawings
The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, there is shown in the drawings,
fig. 1 is a schematic structural diagram of a ship waste heat recovery power generation system according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
Fig. 1 is a schematic structural diagram of a ship waste heat recovery power generation system according to an embodiment of the present invention. As shown in fig. 1, the system includes: the system comprises a main machine 10, a first heat exchange device 21, a gas-liquid separation device 31, an expander 40, a generator 80, a mixing device 51 and a heating system 60.
Specifically, in embodiment 1, the main machine 10 may be a power output unit such as a marine diesel engine. The main body 10 is capable of generating smoke. The flue gas can be medium-high temperature flue gas. The first heat exchange device 21 is communicated with the main machine 10 and is used for exchanging heat between the first mixed working medium and the flue gas so as to heat the first mixed working medium. Specifically, the first heat exchange device 21 is communicated with an exhaust passage of the main unit 10, so that the flue gas exhausted from the main unit 10 can enter the first heat exchange device 21. The first heat exchanger 21 can then heat the first mixed working medium by means of the flue gas having a medium-high temperature. For example, the first heat exchange device 21 may be an industrial heat exchanger. The first heat exchange means 21 may comprise a hot side and a cold side. The cold side and the hot side may be pipes intertwined and in thermal contact. The hot side is used for circulating the flue gas, and the cold side is used for circulating first mixed working medium for the hot side can carry out the heat transfer to the cold side, and then heats the first mixed working medium of cold side. The first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23, which will be described later, may be industrial heat exchangers in the prior art, and will not be described herein again.
The first mixed working medium is a mixture at least comprising two working media, wherein the boiling point of at least one working medium is lower than 100 ℃. For example, the first mixed working medium may be an ammonia water mixture, wherein the boiling point of ammonia gas is lower than 100 ℃, so that ammonia gas is easy to evaporate to form ammonia vapor after the ammonia water mixture is heated, and the remaining part is water containing a small amount of ammonia gas. Preferably, the ammonia is a standard conventional chemical solvent, is widely applied to agriculture, refrigeration, power industry and the like, is properly treated, is a safe chemical preparation conforming to ecology, and the price of the ammonia water working medium is much lower than that of the organic working medium. Compared with the prior art in which water is used as a working medium, the steam for power generation can be generated under the condition of low temperature of flue gas, and the utilization rate of heat is further improved.
In addition, compared with water and organic working media, the ammonia water is subjected to variable-temperature evaporation in the evaporation process, so that the irreversible loss of the working media in the heat absorption process can be reduced, a good matching characteristic is formed with the temperature of a heat source, and the utilization rate of the heat source is improved. The first mixed working medium is heated to form a liquid working medium and steam (such as ammonia water steam). The critical pressure of ammonia is 12MPa, the working pressure of the pressure-bearing part can be reduced at a higher heat absorption temperature by taking ammonia water as a working medium, the design and the operation of saturated heat exchange equipment and a pipeline system of the ship waste heat recovery power generation system are facilitated, and the equipment investment is reduced.
It should be noted that the liquid working medium has a lower ammonia content than the ammonia vapor and the first mixed working medium. Therefore, in the following description, the first mixed working medium is ammonia water (ammonia-rich solution) with a relatively high ammonia content; the liquid working medium is also an ammonia water mixture (lean ammonia solution) with low ammonia content, and the steam is ammonia water steam consisting of a main part of ammonia gas and the rest of water vapor.
The first mixed working medium is ammonia water (ammonia-rich solution) with high ammonia content; the liquid working medium is also an ammonia water mixture (ammonia-poor solution) with low ammonia content, and the steam is a main part of ammonia gas and the rest part of steam for illustration.
The first mixed working medium can generate liquid working medium and steam after being heated. Specifically, in this embodiment, the ammonia water is heated to generate ammonia vapor and an ammonia water mixture containing a small amount of ammonia gas. The mixture is introduced into the gas-liquid separation device 31 connected to the first heat exchange device 21 through a pipe. After the mixture is introduced into the gas-liquid separation device 31, steam (for example, ammonia steam) is introduced into an expander 40 connected thereto through a pipe provided in, for example, an upper portion of the gas-liquid separation device 31, and the expander 40 can generate electricity from the ammonia steam. The ammonia water mixture (liquid working medium) containing a small amount of ammonia gas in the gas-liquid separation device 31 can flow out through a pipe provided, for example, at the lower portion of the gas-liquid separation device 31.
The steam with high temperature and high pressure is changed into low pressure and low temperature steam after doing work in the expander 40, and then is discharged from the outlet of the expander generator set 40. The mixing device 51 may be respectively communicated with the liquid working medium outlet of the gas-liquid separation device 31 and the outlet of the expander generator set 40, for mixing the liquid working medium and the steam with reduced temperature. The steam may be mixed with water containing a small amount of ammonia gas in the mixing device 51 to form a gas-liquid mixture.
Specifically, the expander 40 may be a high inlet pressure turbine, and may take the form of a centripetal turbine, a centrifugal turbine, a screw expander, or the like. The generator can select a high-speed generator or a low-speed generator according to the power grade and the rotating speed condition. If a high speed generator is used, the expander is directly coaxial with the generator or coupled via a coupling. If a low speed generator is used, a reduction gearbox may be used to connect the expander 40 to the generator 80.
The heating system 60 is in communication with the mixing device 51, and is configured to condense a mixture (i.e., a gas-liquid mixture of the liquid working medium and the steam) generated after mixing in the mixing device 51, and liquefy the gas-liquid mixture into a first mixed working medium. Specifically, the heating system 60 may be in communication with the mixing device 51, and is configured to heat water by using heat of the mixed gas-liquid mixture (an ammonia water mixture containing a small amount of ammonia and ammonia vapor), so as to generate hot water, and condense the gas-liquid mixture into the first mixed working medium.
Specifically, the heating system 60 may include a first condenser 61, a compressor 62, a second condenser 63, and a throttle valve 64, which are connected in series. The inlet of the first condenser 61 is connected to the outlet of the throttle valve 64, and the outlet of the first condenser 61 is connected to the compressor 62. The hot side of the first condenser 61 uses a gas-liquid mixture of gas and liquid phases (a gas-liquid mixture of a mixed liquid working medium and steam) of the mixing device 51 as a heat source, and the cold side of the first condenser is a heating agent working medium (for example, high-concentration ammonia water), so that the heat of the gas-liquid mixture is transferred to the heating agent working medium, the gas-liquid mixture from the mixing device 51 is condensed into a liquid state through heat exchange, and the heating agent working medium in the first condenser 61 is heated and evaporated into low-temperature and low-pressure heating agent steam, for example, low-temperature and low-pressure ammonia water steam.
The compressor 62 of the heating system 60 is configured to compress the low-temperature and low-pressure heating medium vapor into the high-temperature and high-pressure heating medium vapor, and the temperature and pressure of the compressed vapor can be adjusted by controlling the performance of the compressor 62. An inlet of the compressor 62 is connected to an outlet of the first condenser 61, and an outlet of the compressor 62 is connected to the second condenser 63.
The second condenser 63 of the heating system 60 serves to transfer heat of the high-temperature and high-pressure heating agent vapor to water to heat the water. Specifically, the cold side of the second condenser 63 circulates water to be heated, the hot side circulates high-temperature and high-pressure heating agent steam (such as ammonia water steam), the inlet of the hot side is connected with the outlet of the compressor 62, the outlet of the hot side is connected with the throttle valve 64, so that the heat of the high-temperature and high-pressure ammonia water steam is transferred to the water to be heated to heat the water to be heated, and the ammonia water steam is condensed into a saturated ammonia water solution (i.e., a heating agent working medium) after releasing heat. The throttle valve 64 has a main function of throttling and depressurizing the high-pressure ammonia solution, and adjusting the high-pressure ammonia solution at the inlet into low-pressure gas-liquid two-phase ammonia water. The throttle valve 64 has an inlet connected to the hot side outlet of the second condenser 63 and an outlet connected to the cold side inlet of the first condenser 61.
In embodiment 1, in order to utilize the heat of the flue gas more efficiently, reduce the irreversible loss in the heat release process to the maximum extent and improve the heat energy utilization efficiency, the system further comprises a second heat exchange device 22. Further preferably, the system further comprises a third heat exchange device 23. Specifically, the hot side of the second heat exchanging device 22 is located between the mixing device 51 and the heating system 60. The cold side of the second heat exchange device 22 is located between the first heat exchange device 21 and the heating system 60. The second heat exchange device 22 heats the condensed first mixed working medium by using the heat of the second mixed working medium (ammonia water mixture containing a small amount of ammonia gas) coming out of the gas-liquid separation device 31. It is further ensured that the first mixed working medium can be raised to a relatively high temperature before entering the first heat exchange device 21.
The hot side of the third heat exchange means 23 may be located between the gas-liquid separation device 31 and the mixing means 51. The cold side of the third heat exchange means 23 may be located between the cold side of the second heat exchange means 22 and the first heat exchange means 21. The third heat exchanger 23 heats the condensed first mixed working medium by using the heat of the liquid working medium just coming out of the gas-liquid separator 31, so that the temperature of the liquid working medium can be reduced to a relatively low temperature before the liquid working medium enters the mixing device 51, and the heat of the working medium of the non-working part is fully utilized.
In the present embodiment, a pressure regulating valve 72 may be further provided between the gas-liquid separation device 31 and the mixing device 51. The pressure regulating valve 72 may be two-stage. The pressure regulating valve 72 can control the pressure of the liquid working medium in the gas-liquid separation device 31 entering the mixing device 51, and further regulate the pressure of the mixture mixed by the mixing device 51. In this implementation, the system also includes a generator 80. The generator 80 and the expander 40 can constitute an expansion generator set for outputting electric energy to the outside.
The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A marine vessel waste heat recovery power generation system, comprising:
a main machine, which generates flue gas;
The first heat exchange device is communicated with the host and is used for exchanging heat between a first mixed working medium and the flue gas so as to heat the first mixed working medium;
the gas-liquid separation device is communicated with the first heat exchange device and is used for separating the liquid working medium and the steam generated by heating the first mixed working medium;
the expander generator set is communicated with a steam outlet of the gas-liquid separation device and is used for generating power by utilizing the steam;
the mixing device is respectively communicated with a liquid side working medium outlet of the gas-liquid separation device and an outlet of the expander generator set and is used for mixing the separated liquid working medium with the steam with the temperature and pressure reduced; and
the heating system is communicated with the mixing device and is used for condensing the mixed liquid working medium and the steam gas-liquid mixture and liquefying the gas-liquid mixture into the first mixed working medium;
the first mixed working medium is a mixture at least comprising two working media, wherein the boiling point of at least one of the working media is lower than 100 ℃.
2. The ship waste heat recovery power generation system of claim 1, wherein the liquid working medium is a mixture of the first mixed working medium and the steam after partial evaporation, and the steam is formed by evaporation of the working medium with the lowest boiling point in the first mixed working medium.
3. The ship waste heat recovery power generation system of claim 1, wherein the first mixed working medium is ammonia water, the heating system circulating working medium is high-concentration ammonia water, and other organic working media such as R245fa, R123, R134a, R22 and the like can be selected.
4. The marine vessel waste heat recovery power generation system of claim 1, wherein the heating system is disposed between the mixing device and the first heat exchange device.
5. The marine heat recovery power generation system of claim 1, further comprising a second heat exchange device, wherein a hot side of the second heat exchange device is located between the mixing device and the heating system, and a cold side of the second heat exchange device is located between the first heat exchange device and the heating system.
6. The marine vessel waste heat recovery power generation system of claim 5, further comprising a third heat exchange device, wherein a hot side of the third heat exchange device is located between the gas-liquid separation device and the mixing device, and a cold side of the third heat exchange device is located between a cold side of the second heat exchange device and the first heat exchange device.
7. The marine vessel waste heat recovery power generation system of claim 6, wherein a pressure regulating valve is arranged between the hot side of the third heat exchange device and the mixing device, and is used for controlling the pressure of the liquid working medium input into the mixing device.
8. The ship waste heat recovery power generation system of claim 1, wherein the heating system comprises a first condenser, a compressor, a second condenser and a throttle valve which are sequentially communicated;
the first condenser is used for transferring the heat of the gas-liquid mixture to a heating agent working medium, the gas-liquid mixture is condensed into a liquid state through heat exchange, and the heating agent working medium is heated and evaporated into low-temperature and low-pressure heating agent steam;
the compressor is used for compressing the low-temperature and low-pressure heating agent steam into high-temperature and high-pressure heating agent steam;
the second condenser is used for transferring the heat of the high-temperature and high-pressure heating agent steam to water to heat the water;
the throttle valve is used for throttling and depressurizing the heating agent behind the second condenser into a low-pressure heating agent.
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| CN201910363894.3A CN111852598A (en) | 2019-04-30 | 2019-04-30 | Ship waste heat recovery power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910363894.3A CN111852598A (en) | 2019-04-30 | 2019-04-30 | Ship waste heat recovery power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852599A (en) * | 2019-04-30 | 2020-10-30 | 中国船舶重工集团公司第七一一研究所 | Ship waste heat recovery power generation system |
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| US4093868A (en) * | 1974-04-29 | 1978-06-06 | Manning John I | Method and system utilizing steam turbine and heat pump |
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