CN111486479B - Dual-fuel ship power system based on liquid air energy storage and use method thereof - Google Patents
Dual-fuel ship power system based on liquid air energy storage and use method thereof Download PDFInfo
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- CN111486479B CN111486479B CN202010319926.2A CN202010319926A CN111486479B CN 111486479 B CN111486479 B CN 111486479B CN 202010319926 A CN202010319926 A CN 202010319926A CN 111486479 B CN111486479 B CN 111486479B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
The invention discloses a dual-fuel ship power system based on liquid air energy storage and a using method thereof. Before sailing, when electricity is used in a valley, liquid air is prepared as a ship power fuel and is loaded onto a ship; during navigation, the pressurized air and natural gas are mixed and combusted in a combustion chamber to generate high-temperature gas, and meanwhile, the high-temperature gas exchanges heat with a closed Rankine circulation loop and a liquid air power generation process; after being pressurized and subjected to multi-stage heat exchange, the liquid air enters an air turbine unit to be expanded and generate power, meanwhile, part of waste gas heat is recycled, and the redundant low-temperature liquid air cold energy can be used for cooling a freezing chamber; the vaporized liquid air is pure and has low enthalpy value, and the hot and humid air in the mixed environment can be used for refrigerating the ship room. The invention can realize the purposes of indoor cooling and dehumidification, ship power supply and high-efficiency utilization of liquid air energy storage.
Description
Technical Field
The invention relates to a liquid air energy storage and refrigeration technology, in particular to a dual-fuel ship power system based on liquid air energy storage and a using method thereof, and discloses a high-efficiency device and a method for cooling and dehumidifying a ship chamber by using cold air, supplying power to a ship by using liquid air and preparing dual fuels.
Background
The liquid air energy storage technology is a cryogenic energy storage technology which utilizes liquid air or liquid nitrogen as an energy storage medium. In a power valley period, liquid air or liquid nitrogen is produced by utilizing electric energy, and meanwhile, compression heat in the compression process is stored in a heat storage tank; and in the electric peak period, the liquid air is pressurized by a pump to generate cold energy and drive the air turbine to do work and generate power. The liquid air energy storage has the characteristics of large volume energy storage density, lower critical pressure and temperature, long service life of components, environmental friendliness, no geographic condition limit and the like, and is mainly suitable for large-scale and energy-type application.
When the ship sails near the equator, the air temperature is high and the humidity is high; in order to provide a comfortable working environment for the personnel on the ship, the ship air conditioner is necessary. At present, most of refrigeration for ships adopts a vapor compression refrigeration mode, and the refrigeration quantity is generated by utilizing the evaporation of a refrigerant, so that the temperature is reduced and the dehumidification is realized; although the mode has high refrigeration coefficient, compact device and mature technology, a large amount of electric energy is consumed, and the refrigeration benefit is low particularly under the conditions of ocean navigation and insufficient energy supply. The adsorption refrigeration driven by redundant low-grade heat energy has the limitation of poor heat and mass transfer effects.
In addition, the large amount of carbon dioxide and waste heat generated during the sailing process of the ship can cause great damage to the marine environment. Therefore, how to efficiently and reasonably utilize the liquid air energy storage system to cool and dehumidify the ship and provide fuel and power for the ship by combining clean energy natural gas has important significance.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a dual-fuel ship power system based on liquid air energy storage and having efficient and reasonable ship driving and refrigerating modes.
It is a further object of the invention to provide a method of use of said system.
The technical scheme is as follows: the dual-fuel ship power system comprises a closed Rankine circulation loop, a dual-fuel preparation process loop and a liquid air power generation process loop, wherein the closed Rankine circulation loop is connected in series in the liquid air power generation process loop, and the other input end of the closed Rankine circulation loop is connected with the output end of the dual-fuel preparation process loop, the closed Rankine circulation loop is used for cold energy transmission between the dual-fuel preparation process loop and the liquid air power generation process loop, the dual-fuel preparation process loop is used for preparing natural gas as fuel for a ship, and the liquid air power generation process loop is used for gasifying liquid air to provide power for the ship.
Preferably, the closed Rankine cycle includes: the system comprises a condensation heat exchanger, an evaporation heat exchanger, a pressure pump and a gas turbine, wherein the input end of the pressure pump is connected with the left output end of the evaporation heat exchanger, the output end of the pressure pump is connected with the left input end of the condensation heat exchanger, the input end of the gas turbine is connected with the right output end of the condensation heat exchanger, and the output end of the gas turbine is connected with the right input end of the evaporation heat exchanger; the right input end of the condensing heat exchanger is connected with the output end of the dual-fuel preparation process loop, and the left input end and the right output end of the evaporating heat exchanger are connected in series in the liquid air power generation process loop. The closed Rankine cycle continuously supplies cold energy to the dual-fuel preparation process loop under the driving of redundant low-temperature liquid air cold energy, and the output work of the turbine is effectively improved.
Preferably, the dual fuel preparation process loop comprises: the gas turbine unit comprises an air turbine unit, an air compressor, a combustion chamber and a gas turbine unit, wherein the air turbine unit is provided with an upper side input end, an upper side output end, a lower side input end and a lower side output end; the left input end of the gas turbine unit is connected with the right output end of the combustion chamber, and the right output end of the gas turbine unit is connected with the upper input end of the air turbine unit; the upper side output end of the air turbine unit is connected with the right side input end of the condensing heat exchanger of the closed Rankine cycle loop, the lower side input end of the air turbine unit is connected with the right side output end of the second heat exchanger of the liquid air power generation process loop, and the lower side output end of the air turbine unit is connected with the right side input end of the second heat exchanger of the liquid air power generation process loop. The dual-fuel preparation process loop takes natural gas mixed high-pressure air as a mixed working medium on the basis of the liquid air preparation process in the existing liquid air energy storage system, and the product can be directly used for a ship power system, so that the emission pollution of combustion tail gas is reduced, the power supply of a ship is ensured, and the ship navigation economy is improved.
Preferably, the air turbine set comprises at least one group of heat exchangers and air turbines, the number of the heat exchangers is the same as that of the air turbines, the heat exchangers in each group are connected in parallel, the right input ends of all the heat exchangers form the upper input end of the air turbine set in parallel, and the left output ends of all the heat exchangers form the upper output end of the air turbine set in parallel; the left input end of the foremost heat exchanger is the lower side input end of the air turbine unit; an air turbine is connected between two adjacent heat exchangers in series, an air turbine is connected between the last heat exchanger and the liquid air power generation process loop in series, and the output end of the last air turbine is the lower side output end of the air turbine set.
Preferably, the gas turbine installation comprises at least one gas turbine.
Preferably, the liquid air power generation process loop comprises: the system comprises a liquid air storage tank, a cryogenic pump, a first heat exchanger, a second heat exchanger and a mixer, wherein the input end of the cryogenic pump is connected with the liquid air storage tank, and the output end of the cryogenic pump is connected with the left input end of an evaporation heat exchanger; the first heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the evaporation heat exchanger, and the left output end and the right input end are connected with the freezing chamber; the second heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the first heat exchanger, and the right input end and the right output end are respectively connected with the lower side output end and the lower side input end of the air turbine unit of the dual-fuel preparation process loop; the mixer has right side input, upside input and left side output, the upside input with the left side output of second heat exchanger links to each other, and ambient air is input to the right side input, and the output of left side output can be used to the refrigerated cold air in the boats and ships room. On the basis of the liquid air power generation process in the existing liquid air energy storage system, the liquid air power generation process loop supplies redundant low-temperature liquid air cold energy to the freezing chamber, and simultaneously, the clean cold air of the product of the liquid air power generation circulation is directly used for cooling and dehumidifying the ship, so that the economic benefit of the system is improved, and the quality of the air in the ship is greatly improved.
Two heat exchangers in a liquid air power generation process loop are used, one heat exchanger is used for supplying redundant cold energy to a freezing chamber, and economic benefit is improved; one is used for exchanging heat with the clean cold air of the liquid air power generation cycle product, thereby improving the energy utilization efficiency.
The use method of the dual-fuel ship power system comprises the following steps:
(1) before sailing, when electricity is used in a valley, liquid air is prepared as a ship power fuel and is loaded onto a ship;
(2) in navigation, the dual-fuel preparation process works: after entering an air compressor, pressurizing the ambient air to high pressure, entering a combustion chamber to mix natural gas and raise the temperature, and obtaining fuel gas which can be used as power fuel of a ship; after entering a gas turbine unit for expansion and cooling, high-temperature and high-pressure gas at the outlet of the combustion chamber sequentially enters an air turbine unit and a condensing heat exchanger for absorbing and capturing cold energy and continuously cooling;
(3) during the peak period of electricity utilization, the liquid air power generation process works: liquid air at the outlet of the liquid air storage tank is pressurized to high pressure through a low-temperature pump, and then sequentially passes through an evaporation heat exchanger, a first heat exchanger and a second heat exchanger to release cold energy for heating, wherein the cold energy is respectively used for compression refrigeration cycle, refrigeration of a freezing chamber and indoor air conditioning, and then enters an air turbine unit for expansion power generation; the vaporized liquid air is pure and has low enthalpy value, and the hot and humid air in the mixed environment can be used for refrigerating the ship room.
The dual-fuel vessel power system comprises a closed Rankine circulation loop, a dual-fuel preparation process and a liquid air power generation process. Before sailing, when electricity is used in a valley, liquid air is prepared as a ship power fuel and is loaded onto a ship; during navigation, the pressurized air and natural gas are mixed and combusted in a combustion chamber to generate high-temperature gas, the gas which can be used as power fuel of a ship is obtained, and meanwhile, heat exchange is carried out with a closed Rankine circulation loop and a liquid air power generation process; after being pressurized and subjected to multi-stage heat exchange, the liquid air enters an air turbine unit to be expanded and generate power, meanwhile, part of waste gas heat is recycled, and the redundant low-temperature liquid air cold energy can be used for cooling a freezing chamber; the vaporized liquid air is pure and has low enthalpy value, and the hot and humid air in the mixed environment can be used for refrigerating the ship room. The invention can realize the purposes of indoor cooling and dehumidification, ship power supply and high-efficiency utilization of liquid air energy storage.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the invention shunts the cold energy of the low-temperature liquid air and the compression heat energy of the high-temperature waste gas for heat exchange, recovers the heat in the combustion waste gas and effectively improves the output work of the turbine.
(2) According to the invention, natural gas mixed high-pressure air is used as the working medium in the dual-fuel preparation process, and the product can be directly used for a ship power system, so that the emission pollution of combustion tail gas is reduced, the power supply of a ship is ensured, and the sailing economy of the ship is improved.
(3) The invention can utilize the cold energy of redundant low-temperature liquid air to supply a freezing chamber and drive closed Rankine cycle power generation, thereby improving the energy utilization efficiency.
(4) The invention directly uses the clean cold air of the product of the liquid air power generation circulation for cooling and dehumidifying the ship, improves the economic benefit of the system and greatly improves the quality of the air in the ship.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a Ts plot of the liquid air power generation process in the system of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The following description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the following embodiments, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
The dual-fuel ship power system takes the particularity of the hot and humid environment of the ship into consideration, is optimized on the basis of the original liquid air energy storage system, provides power for the ship by preparing dual fuels and liquid air to absorb heat and expand to drive the air turbine to do work, uses cold air after the air turbine does work to process hot and humid air in a ship chamber, achieves the effects of refrigeration and dehumidification, and is an efficient and reasonable ship driving and refrigeration mode.
The dual-fuel ship power system comprises a closed Rankine circulation loop, a dual-fuel preparation process loop and a liquid air power generation process loop, wherein the closed Rankine circulation loop is connected in series in the liquid air power generation process loop, and the other input end of the closed Rankine circulation loop is connected with the output end of the dual-fuel preparation process loop, the closed Rankine circulation loop is used for cold energy transmission between the dual-fuel preparation process loop and the liquid air power generation process loop, the dual-fuel preparation process loop is used for preparing natural gas as fuel for a ship, and the liquid air power generation process loop is used for gasifying liquid air to provide power for the ship.
Wherein, closed Rankine circulation circuit includes: condensing heat exchanger, evaporating heat exchanger, pressure pump and gas turbine.
Specifically, the condensing heat exchanger has a left input end, a left output end, a right input end and a right output end, and the evaporating heat exchanger has a left input end, a left output end, a right input end and a right output end; the input end of the pressure pump is connected with the left output end of the evaporation heat exchanger, and the output end of the pressure pump is connected with the left input end of the condensation heat exchanger; and the gas turbine input end is connected with the right output end of the condensing heat exchanger, and the gas turbine output end is connected with the right input end of the evaporating heat exchanger. In this embodiment, the gas turbine is an ethane turbine.
The dual fuel preparation process loop comprises: an air turbine assembly, an air compressor, a combustor, and a gas turbine assembly.
Specifically, the air turbine set is provided with an upper side input end, an upper side output end, a lower side input end and a lower side output end, the air compressor is provided with a left side input end and a right side output end, the combustion chamber is provided with two left side input ends and a right side output end, one left side input end is connected with the right side output end of the air compressor, and the other left side input end is used for inputting natural gas; the left input end of the gas turbine unit is connected with the right output end of the combustion chamber, and the right output end of the gas turbine unit is connected with the upper input end of the air turbine unit; the right input end of the condensing heat exchanger is connected with the upper side output end of the air turbine unit.
The air turbine unit comprises a plurality of heat exchangers and an air turbine, wherein the heat exchangers are connected in parallel, the right input ends of all the heat exchangers are connected in parallel to form the upper input end of the air turbine unit, and the left output ends of all the heat exchangers are connected in parallel to form the upper output end of the air turbine unit; the left input end of the foremost heat exchanger is the lower side input end of the air turbine unit; an air turbine is connected between two adjacent heat exchangers in series, an air turbine is connected between the last heat exchanger and the liquid air power generation process loop in series, and the output end of the last air turbine is the lower side output end of the air turbine set.
As shown in fig. 1, the air turbine set in this embodiment includes three heat exchangers and three air turbines, i.e., a third heat exchanger, a fourth heat exchanger and a fifth heat exchanger, a first air turbine, a second air turbine and a third air turbine, wherein right side input ends of the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger jointly form an upper side input end of the air turbine set, and left side output ends of the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger jointly form an upper side output end of the air turbine set; the left side input end of the third heat exchanger is the lower side input end of the air turbine set and is connected with the right side output end of the second heat exchanger in the liquid air power generation process loop, the right side output end of the third heat exchanger is connected with the input end of the first air turbine, the output end of the first air turbine is connected with the left side input end of the fourth heat exchanger, the right side output end of the fourth heat exchanger is connected with the input end of the second air turbine, the output end of the second air turbine is connected with the left side input end of the fifth heat exchanger, the right side output end of the fifth heat exchanger is connected with the input end of the third air turbine, and the output end of the third air turbine is the lower side output end of the air turbine set and is connected with the right side input end of the second heat exchanger in the liquid air power generation process loop.
The gas turbine plant comprises at least one gas turbine, and in the embodiment shown in fig. 1, the gas turbine plant comprises two gas turbines, namely a first gas turbine and a second gas turbine, the first gas turbine and the second gas turbine are connected in series, an input end of the first gas turbine is connected with a right output end of the combustion chamber, and an output end of the second gas turbine is connected with an upper input end of the air turbine plant.
The liquid air power generation process loop comprises: the system comprises a liquid air storage tank, a cryogenic pump, a first heat exchanger, a second heat exchanger and a mixer.
Specifically, the input end of the cryogenic pump is connected with the liquid air storage tank, and the output end of the cryogenic pump is connected with the left input end of the evaporation heat exchanger; the first heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the evaporation heat exchanger, and the left output end and the right input end are connected with the freezing chamber; the second heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the first heat exchanger, and the right input end and the right output end are respectively connected with the lower side output end and the lower side input end of the air turbine unit; the mixer has right side input, upside input and left side output, the upside input with the left side output of second heat exchanger links to each other, and the ambient air that meets the requirements is input to the right side input, and the output of left side output can be used to the refrigerated cold air in the boats and ships room.
The use method of the dual-fuel ship power system comprises the following steps:
(1) before sailing, when electricity is used in a valley, liquid air is prepared as a ship power fuel and is loaded onto a ship;
(2) in navigation, a loop of the dual-fuel preparation process works: after entering an air compressor, ambient air is pressurized to a high pressure (usually about 17 bar), enters a combustion chamber and is mixed with natural gas to be heated (the temperature is about 1413K), and fuel gas which can be used as a ship power fuel is obtained; after entering a gas turbine unit for expansion cooling (about 814.24K), high-temperature and high-pressure gas at the outlet of the combustion chamber sequentially enters an air turbine unit and a condensation heat exchanger for absorbing and capturing cold energy and continuously cooling (about 358K).
(3) During the peak period of electricity utilization, the liquid air power generation process loop works: liquid air at the outlet of the liquid air storage tank is pressurized to high pressure (usually about 120 bar) through a low-temperature pump, and then sequentially passes through an evaporation heat exchanger, a first heat exchanger and a second heat exchanger to release cold energy for heating (about 308.38K), wherein the cold energy is respectively used for compression type refrigeration cycle, refrigeration of a freezing chamber and indoor air conditioning, and then enters an air turbine unit for expansion power generation; the vaporized liquid air is pure and has low enthalpy value, and the hot and humid air in the mixed environment can be used for refrigerating the ship room.
The loop of the dual-fuel preparation process adopts a mixed working medium of air and natural gas; a pure air working medium is adopted in a liquid air power generation process loop; the closed Rankine cycle loop adopts working mediums such as ethane and the like.
The low-temperature liquid air cold energy and the high-temperature waste gas compression heat energy are shunted for heat exchange, the heat in the combustion waste gas is recovered, and the output work of the turbine is effectively improved. The natural gas mixed high-pressure air is used as the working medium in the dual-fuel preparation process, and the product can be directly used for a ship power system, so that the emission pollution of combustion tail gas is reduced, the power supply of a ship is ensured, and the sailing economy of the ship is improved. The redundant cold energy of the low-temperature liquid air can be used for supplying cold energy to the freezing chamber and driving the closed Rankine cycle power generation, and the energy utilization efficiency is improved. The clean cold air of the product of the liquid air power generation circulation is directly used for cooling and dehumidifying the ship, so that the economic benefit of the system is improved, and the quality of the air in the ship is greatly improved.
To further illustrate an example of the present invention, a simulation calculation was performed on FIG. 1, with the system key point parameters shown in Table 1.
TABLE 1 parameters for various operating points in FIG. 1
The invention shunts the cold energy of the low-temperature liquid air and the compression heat energy of the high-temperature waste gas for heat exchange, recovers the heat in the combustion waste gas and effectively improves the output work of the turbine.
The natural gas has the characteristics of small pollution of combustion products, high heat value and the like, and the natural gas mixed air is used as a substitute fuel of part of diesel oil, so that the pollution of combustion tail gas emission is reduced, and the power supply of the ship is also ensured; in order to further verify that the invention can improve the ship navigation economy, a 1000kW diesel engine with 205 liters of diesel oil per hour and 8000 hours of annual service time is taken as an example, the diesel oil cost is 8 yuan/L, and the natural gas cost is 4.7 yuan/m3(other costs already included), the heating value of natural gas and diesel are matched to 1.05m3The substitution of 50% of the diesel fuel with natural gas will result in a cost savings of approximately 25% over the full use of diesel fuel.
In order to further utilize cold air to cool and dehumidify the ship interior, a suitable indoor refrigeration condition (such as a typical room CFD model shown in fig. 1) is selected for simulation calculation: indoor area of 15m2The number of people is 2, the indoor design temperature is 26, the indoor design relative humidity is 60%, the indoor cooling load is 1.65kW, and the indoor humidity load is 0.218 kg/h; under the working condition, the vaporized pure air (the mass flow is 0.46kg/s, the design temperature is 292K, and the relative humidity is 0%) is mixed with the high-humidity high-temperature air (the mass flow is 0.29kg/s, the design temperature is 308K, and the relative humidity is 90%) on the sea surface, and the cold air (the mass flow is 0.75kg/s, the design temperature is 296.8K, and the relative humidity is 70.8%) with the temperature and humidity meeting the indoor design requirement is obtained.
In order to further illustrate the state change of the liquid air working medium in the liquid air power generation process loop, a temperature/entropy diagram is drawn at the working condition points 19-30 of the liquid air power generation process loop in fig. 1, as shown in fig. 2.
Claims (6)
1. A dual-fuel ship power system based on liquid air energy storage is characterized by comprising a closed Rankine circulation loop, a dual-fuel preparation process loop and a liquid air power generation process loop, wherein the closed Rankine circulation loop is connected in series in the liquid air power generation process loop, and the other input end of the closed Rankine circulation loop is connected with the output end of the dual-fuel preparation process loop, the closed Rankine circulation loop is used for cold energy transmission between the dual-fuel preparation process loop and the liquid air power generation process loop, the dual-fuel preparation process loop is used for preparing natural gas for ship fuel, and the liquid air power generation process loop is used for gasifying liquid air to provide power for a ship;
the dual fuel preparation process loop comprises: the gas turbine unit comprises an air turbine unit, an air compressor, a combustion chamber and a gas turbine unit, wherein the air turbine unit is provided with an upper side input end, an upper side output end, a lower side input end and a lower side output end; the left input end of the gas turbine unit is connected with the right output end of the combustion chamber, and the right output end of the gas turbine unit is connected with the upper input end of the air turbine unit; the upper side output end of the air turbine unit is connected with the right side input end of the condensing heat exchanger of the closed Rankine cycle loop, the lower side input end of the air turbine unit is connected with the right side output end of the second heat exchanger of the liquid air power generation process loop, and the lower side output end of the air turbine unit is connected with the right side input end of the second heat exchanger of the liquid air power generation process loop.
2. The dual-fuel vessel power system based on liquid air energy storage as claimed in claim 1, wherein the closed Rankine cycle comprises: the system comprises a condensation heat exchanger, an evaporation heat exchanger, a pressure pump and a gas turbine, wherein the input end of the pressure pump is connected with the left output end of the evaporation heat exchanger, the output end of the pressure pump is connected with the left input end of the condensation heat exchanger, the input end of the gas turbine is connected with the right output end of the condensation heat exchanger, and the output end of the gas turbine is connected with the right input end of the evaporation heat exchanger; the right input end of the condensing heat exchanger is connected with the output end of the dual-fuel preparation process loop, and the left input end and the right output end of the evaporating heat exchanger are connected in series in the liquid air power generation process loop.
3. The dual-fuel ship power system based on liquid air energy storage is characterized in that the air turbine set comprises at least one group of heat exchangers and air turbines, the number of the heat exchangers is the same as that of the air turbines, the heat exchangers in each group are connected in parallel, the right input ends of all the heat exchangers form the upper input end of the air turbine set in parallel, and the left output ends of all the heat exchangers form the upper output end of the air turbine set in parallel; the left input end of the foremost heat exchanger is the lower side input end of the air turbine unit; an air turbine is connected between two adjacent heat exchangers in series, an air turbine is connected between the last heat exchanger and the liquid air power generation process loop in series, and the output end of the last air turbine is the lower side output end of the air turbine set.
4. The dual fuel vessel power system based on liquefied air energy storage as claimed in claim 1, wherein the gas turbine unit includes at least one gas turbine.
5. The dual fuel vessel power system based on liquid air energy storage as claimed in claim 1, wherein the liquid air power generation process loop comprises: the system comprises a liquid air storage tank, a cryogenic pump, a first heat exchanger, a second heat exchanger and a mixer, wherein the input end of the cryogenic pump is connected with the liquid air storage tank, and the output end of the cryogenic pump is connected with the left input end of an evaporation heat exchanger; the first heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the evaporation heat exchanger, and the left output end and the right input end are connected with the freezing chamber; the second heat exchanger is provided with a left input end, a left output end, a right input end and a right output end, the left input end is connected with the right output end of the first heat exchanger, and the right input end and the right output end are respectively connected with the lower side output end and the lower side input end of the air turbine unit of the dual-fuel preparation process loop; the mixer has right side input, upside input and left side output, the upside input with the left side output of second heat exchanger links to each other, and ambient air is input to the right side input, and the output of left side output can be used to the refrigerated cold air in the boats and ships room.
6. Use of a dual fuel vessel power system based on liquid air energy storage according to any of claims 1-5, characterized by the following steps:
(1) before sailing, when electricity is used in a valley, liquid air is prepared as a ship power fuel and is loaded onto a ship;
(2) in navigation, the dual-fuel preparation process works: after entering an air compressor, pressurizing the ambient air to high pressure, entering a combustion chamber to mix natural gas and raise the temperature, and obtaining fuel gas which can be used as power fuel of a ship; after entering a gas turbine unit for expansion and cooling, high-temperature and high-pressure gas at the outlet of the combustion chamber sequentially enters an air turbine unit and a condensing heat exchanger for absorbing and capturing cold energy and continuously cooling;
(3) during the peak period of electricity utilization, the liquid air power generation process works: liquid air at the outlet of the liquid air storage tank is pressurized to high pressure through a low-temperature pump, and then sequentially passes through an evaporation heat exchanger, a first heat exchanger and a second heat exchanger to release cold energy for heating, wherein the cold energy is respectively used for compression refrigeration cycle, refrigeration of a freezing chamber and indoor air conditioning, and then enters an air turbine unit for expansion power generation; the vaporized liquid air is pure and has low enthalpy value, and the hot and humid air in the mixed environment can be used for refrigerating the ship room.
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| CN105736056A (en) * | 2016-02-03 | 2016-07-06 | 中国科学院理化技术研究所 | Liquid air energy storage system |
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| CN109268095A (en) * | 2018-08-15 | 2019-01-25 | 江苏科技大学 | LNG fuel cold energy method of comprehensive utilization and system for double fuel Power Vessel |
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| US20150113940A1 (en) * | 2013-10-25 | 2015-04-30 | Mada Energie Ltd | Systems, methods, and devices for liquid air energy storage in conjunction with power generating cycles |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105736056A (en) * | 2016-02-03 | 2016-07-06 | 中国科学院理化技术研究所 | Liquid air energy storage system |
| CN105928405A (en) * | 2016-06-14 | 2016-09-07 | 全球能源互联网研究院 | Layered cold storage device and cryogenic liquid air energy storage system using same |
| CN108240235A (en) * | 2017-05-26 | 2018-07-03 | 华北电力大学（保定） | A kind of non-compensation combustion type liquefied air energy-storing and power-generating system |
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