CN112324530B - Marine LNG cold energy utilization cold-electricity cogeneration system - Google Patents
Marine LNG cold energy utilization cold-electricity cogeneration system Download PDFInfo
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- CN112324530B CN112324530B CN202011202164.4A CN202011202164A CN112324530B CN 112324530 B CN112324530 B CN 112324530B CN 202011202164 A CN202011202164 A CN 202011202164A CN 112324530 B CN112324530 B CN 112324530B
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- 238000010248 power generation Methods 0.000 claims abstract description 66
- 238000005057 refrigeration Methods 0.000 claims abstract description 44
- 238000004378 air conditioning Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 30
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 13
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 13
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011555 saturated liquid Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 9
- 239000003949 liquefied natural gas Substances 0.000 abstract description 72
- 239000002918 waste heat Substances 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 13
- ZSSPATINHRVRTN-UHFFFAOYSA-N 3-fluoro-2-[4-[(2-nitroimidazol-1-yl)methyl]triazol-1-yl]propan-1-ol Chemical compound N1=NN(C(CF)CO)C=C1CN1C([N+]([O-])=O)=NC=C1 ZSSPATINHRVRTN-UHFFFAOYSA-N 0.000 description 10
- 239000003345 natural gas Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000000969 carrier Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 101100343585 Arabidopsis thaliana LNG1 gene Proteins 0.000 description 2
- 101100184147 Caenorhabditis elegans mix-1 gene Proteins 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
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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
- F01K23/065—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 the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
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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
- F01K25/06—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 mixtures of different fluids
- F01K25/065—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 mixtures of different fluids with an absorption fluid remaining at least partly in the liquid state, e.g. water for ammonia
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
- F02G5/04—Profiting from waste heat of exhaust gases in combination with other waste heat from combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/06—Apparatus for de-liquefying, e.g. by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
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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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a cold and electricity combined supply system for cold energy utilization of marine LNG (liquefied natural gas), which comprises a two-stage LNG cold energy utilization power generation system, a two-stage refrigeration system and an LNG circulating pump, wherein the two-stage LNG cold energy utilization power generation system comprises a first-stage LNG cold energy utilization power generation system, a second-stage refrigeration system and a second-stage LNG cold energy utilization power generation system; the LNG is pressurized by the LNG circulating pump and then enters a first-stage LNG cold energy utilization power generation system for heat exchange; the LNG cold energy sent into the ship main engine is used for ship power generation, a ship low-temperature refrigeration house, a high-temperature refrigeration house and an air conditioning system, the LNG cold energy and the LNG are subjected to heat exchange through a plurality of working media to enable the LNG to reach the air inlet temperature required by the main engine, and the comprehensive utilization efficiency of the cold energy is improved through the combined heat exchange of the working media of the systems. On the basis of integrating the waste heat resources of the ship main engine, LNG high-grade cold energy is fully utilized to carry out low-temperature power generation. The limited LNG cold energy can be fully utilized, and the operation cost of the ship type is effectively reduced.
Description
Technical Field
The invention relates to the technical field of ships, in particular to an LNG cold energy utilization cold-electricity combined supply system of an LNG fuel power fishing boat.
Background
In recent years, natural gas has become a green energy source pillar with its high efficiency, clean performance and wide use.
The natural gas can be liquefied into LNG at 0.101MPa and about-162 ℃, and the volume of the liquefied natural gas is about 1/625 of the latter compared with the volume of the natural gas with the same quality. Generally, the natural gas production place is far away from the demand place, so that the imported natural gas needs to solve the problems of long-distance storage and transportation. While transportation of liquefied natural gas is mainly by sea transportation, it is necessary to liquefy natural gas at a relatively low cost in order to transport such a large amount of natural gas at a high safety. The liquefied natural gas greatly compresses the volume, and the transportation process is greatly facilitated. However, the energy consumption for producing one ton of LNG by the existing LNG production process is about 850 kW.h, and the cold energy released by each ton of LNG vaporized at the receiving terminal can reach 240 kW.h. Therefore, the cold energy is reasonably and effectively utilized, on one hand, the high-grade cold energy of the LNG can be fully utilized, the economic benefit is improved, and on the other hand, the environmental pollution in the LNG gasification process can be reduced.
At present, the pollution prevention convention of the International Maritime Organization (IMO) has higher and higher requirements on the emission of various harmful substances, and compared with the unstable price of fuel oil and the emission of a large amount of CO in combustion2And SOxAnd the LNG has stable and low market price, better emission performance and environmental friendliness. For the above reasons, more LNG carriers use primarily, or even completely, LNG as fuel.
For LNG carriers that are completely LNG-fueled, the power of LNG carriers is large, and thus, the LNG carriers consume nearly 300m per day3LNG (calculated as liquid volume) and BOG produced by cargo hold per day is removed by about 100m3(reduced to liquid volume) there is still a huge amount of cold energy available and therefore has attracted extensive attention from researchers, but the LNG cold energy utilization on small LNG-fueled vessels has not attracted sufficient attention because of the relatively small amount of cold available. However, since there are many places requiring cold energy on the ship, such as a refrigerator, an air conditioner, etc., the operation cost of the ship can be effectively reduced by using the LNG cold energy to replace the conventional refrigeration cycle.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention aims to provide a marine LNG cold energy utilization cold-electricity combined supply system which is stable in operation, safe, reliable, efficient and suitable for a small LNG fuel power ship.
The technical scheme is as follows: in order to achieve the purpose, the marine LNG cold energy utilization cold and power combined supply system comprises a first-stage LNG cold energy utilization power generation system, a second-stage LNG cold energy utilization power generation system, a two-stage refrigeration system and an LNG circulating pump; the LNG enters a first-stage LNG cold energy utilization power generation system for heat exchange after being pressurized by the LNG circulating pump;
the first-stage LNG cold energy utilization power generation system comprises a first heat exchanger, a second heat exchanger, a first mixer, a second working medium pump, a tenth heat exchanger, a fourth heat exchanger, a ninth heat exchanger, a first expander, a separator and a first power generation medium circulating in the first-stage LNG cold energy utilization power generation system, and the first heat exchanger, the second heat exchanger, the first mixer, the second working medium pump, the tenth heat exchanger, the fourth heat exchanger, the ninth heat exchanger, the first expander and the separator are connected in sequence through pipelines to form a closed-loop structure; after being pressurized by a second working medium pump, a first power generation working medium is heated into superheated steam by a tenth heat exchanger, a fourth heat exchanger and a ninth heat exchanger in sequence and expanded in a first expander to do work, the expanded working medium enters the first heat exchanger and the second heat exchanger respectively for heat exchange, and the first power generation working medium is condensed into saturated liquid and then enters the next cycle;
the second-stage LNG cold energy utilization power generation system comprises a tenth heat exchanger, a third working medium pump, a third heat exchanger, a fourth heat exchanger, an eighth heat exchanger, a flash tank, a second expander, a second mixer and a second power generation working medium circulating in the second-stage LNG cold energy utilization power generation system, and the tenth heat exchanger, the third working medium pump, the third heat exchanger, the fourth heat exchanger, the eighth heat exchanger, the flash tank, the second expander and the second mixer are sequentially connected through pipelines; the flash tank is provided with a gas output end and a liquid output end respectively, and the gas output end is connected with the second expander through a pipeline; the working medium at the output end of the liquid and the working medium at the output end of the second expansion machine are mixed in the mixer and are connected with the tenth heat exchanger to form a closed loop structure; the third working medium pump is used for pressurizing the ammonia water solution after heat exchange with the first power generation medium of the first-stage LNG cold energy utilization power generation system, and the ammonia water solution sequentially enters a third heat exchanger, a fourth heat exchanger and an eighth heat exchanger to exchange heat with the first power generation working medium circulating in the first-stage LNG cold energy utilization power generation system and ethanol water solutions with different mass fractions; and after flash evaporation in the flash evaporator, expanding in a second expander to do work, mixing the expanded second power generation working medium with the separated liquid phase, and then, entering a tenth heat exchanger to be condensed into saturated liquid and then entering the next cycle.
Preferably, the first stage LNG cold energy is R1150 used by a first power generation medium in the power generation system; the second-stage LNG cold energy utilizes a second power generation working medium in the power generation system to adopt an ammonia water solution with the mass fraction of 0.86.
Preferably, the third working medium pump pressurizes the ammonia water solution after exchanging heat with the first power generation working medium of the first-stage LNG cold energy utilization power generation system, and the ammonia water solution sequentially enters a third heat exchanger, a fourth heat exchanger, an eighth heat exchanger to exchange heat with the first power generation working medium circulating in the first-stage LNG cold energy utilization power generation system, an ethanol water solution with the mass fraction of 0.6 and an ethanol water solution with the mass fraction of 0.4; and the expanded working medium enters the first heat exchanger and the second heat exchanger for heat exchange at the ratio of 0.25 to 0.75 respectively.
Furthermore, the two-stage refrigeration system comprises a low-temperature refrigeration house system and a refrigeration system formed by serially connecting a high-temperature refrigeration house and an air-conditioning system; the low-temperature refrigeration house system comprises a fourth working medium pump, a fifth heat exchanger, a third heat exchanger and a first refrigeration working medium circulating in the low-temperature refrigeration house system, and the fourth working medium pump, the fifth heat exchanger and the third heat exchanger are connected in sequence through pipelines to form a closed-loop structure; the third heat exchanger takes the material flow pressurized by the third working medium pump and the material flow heated by the second heat exchanger as cold sources; the fifth heat exchanger takes air of a low-temperature refrigerator as a heat source; the refrigerating system formed by connecting the high-temperature refrigeration house and the air conditioning system in series comprises a fifth working medium pump, a sixth heat exchanger, a seventh heat exchanger, a fourth heat exchanger and a second refrigerating working medium circulating in the refrigerating system, and the fifth working medium pump, the sixth heat exchanger, the seventh heat exchanger and the fourth heat exchanger are sequentially connected through pipelines to form a closed-loop structure; the sixth heat exchanger takes air of a high-temperature refrigerator as a heat source; the seventh heat exchanger takes indoor air as a heat source; the fourth heat exchanger takes two streams heated by the third heat exchanger and a stream heated by the tenth heat exchanger as cold sources at the same time.
Furthermore, the first heat exchanger takes the material flow pressurized by the first working medium pump as a cold source, the second heat exchanger takes the material flow heated by the first heat exchanger as the cold source, the tenth heat exchanger takes the material flow at the outlet of the mixer as a heat source, the fourth heat exchanger takes the material flow heated by the seventh heat exchanger as a heat source, and the ninth heat exchanger takes the engine cooling water as a heat source.
The tenth heat exchanger takes the material flow pressurized by the second working medium pump as a cold source; the third heat exchanger takes the material flow heated by the fifth heat exchanger as a heat source; and the eighth heat exchanger takes the exhaust gas discharged by the main engine as a heat source.
Preferably, the first refrigeration working medium in the low-temperature refrigeration house system adopts an ethanol water solution with the mass fraction of 0.6; the second refrigeration working medium in the high-temperature cold storage and the air conditioning system of the two-stage refrigeration system adopts 0.4 mass percent of ethanol water solution.
Has the advantages that: compared with the prior art, the invention has the following remarkable effects: 1. the LNG cold energy sent into the ship main engine is used for ship power generation, ship low-temperature cold storage, high-temperature cold storage and air conditioning systems, the LNG cold energy reaches the inlet air temperature required by the main engine by heat exchange between a plurality of working media and LNG, and the cold energy are improved by combined heat exchange of the working media of the systems
The comprehensive utilization efficiency of (2). 2. On the basis of integrating the waste heat resources of the ship main engine, LNG high-grade cold energy is fully utilized to carry out low-temperature power generation. 3. Limited LNG cold energy can be sufficiently utilized on a certain LNG power fishing vessel, and the operation cost of the ship type is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the present invention includes a two-stage LNG cold energy utilization power generation system, a two-stage refrigeration system, and an LNG circulation pump; LNG enters the first-stage LNG cold energy utilization power generation system after being pressurized by the LNG circulating pump to carry out heat exchange.
The first-stage LNG cold energy utilization power generation system comprises a first heat exchanger HX-1, a second heat exchanger HX-2, a second working medium pump P-2, a first mixer MIX-1, a tenth heat exchanger HX-10, a fourth heat exchanger HX-4, a ninth heat exchanger HX-9, a first expander K-1, a separator SEP and a first power generation working medium (R1150) circulating in the first-stage system, and the first heat exchanger HX-1, the second heat exchanger HX-2, the first mixer MIX-1, the second working medium pump P-2, the tenth heat exchanger HX-10, the fourth heat exchanger HX-4, the ninth heat exchanger HX-9, the first expander K-1 and the separator SEP are sequentially connected through pipelines to form a closed-loop structure; the first heat exchanger takes the material flow pressurized by the first working medium pump as a cold source, the second heat exchanger takes the material flow heated by the first heat exchanger as the cold source, the tenth heat exchanger takes the material flow at the outlet of the mixer as a heat source, the fourth heat exchanger takes the material flow heated by the seventh heat exchanger as a heat source, and the ninth heat exchanger takes the material flow W1 (engine cooling water) as a heat source. The method comprises the steps that engine cylinder jacket cooling water is used as a main heat source of a Rankine cycle power generation system, a first working medium pump P-1 pressurizes material flow LNG1 from a storage tank to 0.65MPa, and heat exchange is conducted between the material flow LNG1 and a first-stage LNG cold energy through a first heat exchanger HX-1 and a second heat exchanger HX-2 and a circulating working medium in the power generation system. After being pressurized by a second working medium pump P-2, the circulating working medium (R1150) is heated into superheated steam by sequentially passing through a tenth heat exchanger HX-10, a fourth heat exchanger HX-4 and a ninth heat exchanger HX-9, and is expanded in a first expander K-1 to do work. The expanded working medium enters the first heat exchanger HX-1 and the second heat exchanger HX-2 for heat exchange at the ratio of 0.25 to 0.75 respectively, and enters the next cycle after being condensed into saturated liquid. The second-stage LNG cold energy utilization cycle power generation system comprises a tenth heat exchanger HX-10, a third working medium pump P-3, a third heat exchanger HX-3, a fourth heat exchanger HX-4, an eighth heat exchanger HX-8, a flash tank V-100, a second expander K-2, a second mixer MIX-2 and a second power generation working medium (ammonia water solution with the mass fraction of 0.86) circulating in the second-stage system, wherein the tenth heat exchanger HX-10, the third working medium pump P-3, the third heat exchanger HX-3, the fourth heat exchanger HX-4, the eighth heat exchanger HX-8, the flash tank V-100, the second expander K-2 and the second mixer MIX-2 are sequentially connected through pipelines. The tenth heat exchanger takes the material flow pressurized by the second working medium pump as a cold source; the third heat exchanger takes the material flow heated by the fifth heat exchanger as a heat source; the eighth heat exchanger uses stream G1 (the main exhaust gas) as the heat source. The flue gas of the ship main engine is used as a main heat source of the second-stage LNG cold energy utilization circulating power generation system, and a high-temperature cold storage, a low-temperature cold storage and an air conditioning system are used as auxiliary materials. The third working medium pump P-3 pressurizes the ammonia water solution subjected to heat exchange with the first-stage LNG cold energy by using the working medium of the power generation system for 7MPa, and the ammonia water solution sequentially enters a third heat exchanger HX-3, a fourth heat exchanger HX-4, an eighth heat exchanger HX-8 to exchange heat with the circulating working medium, an ethanol aqueous solution with the mass fraction of 0.6, an ethanol aqueous solution with the mass fraction of 0.4 and the ship main engine waste gas in the power generation system by using the first-stage LNG cold energy (the ethanol aqueous solutions with different mass fractions exchange heat in the third heat exchanger and the fourth heat exchanger, and the ship main engine waste gas exchanges heat in the eighth heat exchanger). After flash evaporation in the flash evaporator V-100, expansion work is performed in the second expansion machine K-2, the expanded working medium is mixed with the separated liquid phase (C5-1 and C5-2), and then the mixture enters the tenth heat exchanger HX-10 to be condensed into saturated liquid and then enters the next cycle. The tenth heat exchanger HX-10 takes a stream R1 as a cold source; the third heat exchanger HX-3 takes a material flow E2 as a heat source; the fourth heat exchanger HX-4 takes the material flow E-3 as a heat source; the eighth heat exchanger HX-8 takes a material flow G1 as a heat source; the flash tank V-100 is respectively provided with a gas output end and a liquid output end, and the gas output end is connected with a second expander through a pipeline; and the working medium at the output end of the liquid and the working medium at the output end of the second expansion machine are mixed in a second mixer MIX-2 and are connected with a tenth heat exchanger HX-10 to form a closed-loop structure.
The two-stage refrigeration system can be divided into a low-temperature refrigeration house system and a refrigeration system formed by connecting a high-temperature refrigeration house and an air conditioning system in series; the low-temperature refrigeration house system comprises a fourth working medium pump P-4, a fifth heat exchanger HX-5, a third heat exchanger HX-3 and a first refrigeration working medium circulating in the system, and the fourth working medium pump P-4, the fifth heat exchanger HX-5 and the third heat exchanger HX-3 are connected in sequence through pipelines to form a closed-loop structure. The third heat exchanger HX-3 takes the material flow C1 and the LNG4 as cold sources at the same time; the fifth heat exchanger takes the air of the low-temperature cold storage as a heat source.
The refrigeration system with the high-temperature refrigerator and the air conditioning system connected in series comprises a fifth working medium pump P-5, a sixth heat exchanger HX-6, a seventh heat exchanger HX-7, a fourth heat exchanger HX-4 and a second refrigeration working medium circulating in the system, wherein the fifth working medium pump P-5, the sixth heat exchanger HX-6, the seventh heat exchanger HX-7 and the fourth heat exchanger HX-4 are sequentially connected through a pipeline to form a closed-loop structure. Preferably, the sixth heat exchanger HX-6 takes the air of a high-temperature refrigerator as a heat source; the seventh heat exchanger HX-7 takes indoor air as a heat source; the fourth heat exchanger HX-4 takes the stream C2, LNG5 and R2 as cold sources at the same time.
TABLE 1 optimized Key node parameters
Claims (10)
1. The utility model provides a marine LNG cold energy utilizes cold-electricity cogeneration system which characterized in that: the system comprises a first-stage LNG cold energy utilization power generation system, a second-stage LNG cold energy utilization power generation system, a two-stage refrigeration system and an LNG circulating pump; the LNG enters a first-stage LNG cold energy utilization power generation system for heat exchange after being pressurized by the LNG circulating pump;
the first-stage LNG cold energy utilization power generation system comprises a first heat exchanger, a second heat exchanger, a first mixer, a second working medium pump, a tenth heat exchanger, a fourth heat exchanger, a ninth heat exchanger, a first expander, a separator and a first power generation medium circulating in the first-stage LNG cold energy utilization power generation system, and the first heat exchanger, the second heat exchanger, the first mixer, the second working medium pump, the tenth heat exchanger, the fourth heat exchanger, the ninth heat exchanger, the first expander and the separator are connected in sequence through pipelines to form a closed-loop structure; after being pressurized by a second working medium pump, a first power generation working medium is heated into superheated steam by a tenth heat exchanger, a fourth heat exchanger and a ninth heat exchanger in sequence and expanded in a first expander to do work, the expanded working medium enters the first heat exchanger and the second heat exchanger respectively for heat exchange, and the first power generation working medium is condensed into saturated liquid and then enters the next cycle;
the second-stage LNG cold energy utilization power generation system comprises a tenth heat exchanger, a third working medium pump, a third heat exchanger, a fourth heat exchanger, an eighth heat exchanger, a flash tank, a second expander, a second mixer and a second power generation working medium circulating in the second-stage LNG cold energy utilization power generation system, and the tenth heat exchanger, the third working medium pump, the third heat exchanger, the fourth heat exchanger, the eighth heat exchanger, the flash tank, the second expander and the second mixer are sequentially connected through pipelines; the flash tank is provided with a gas output end and a liquid output end respectively, and the gas output end is connected with the second expander through a pipeline; the working medium at the output end of the liquid and the working medium at the output end of the second expansion machine are mixed in the mixer and are connected with the tenth heat exchanger to form a closed loop structure; the third working medium pump is used for pressurizing the ammonia water solution after heat exchange with the first-stage LNG cold energy by using the first power generation medium of the power generation system, and the ammonia water solution sequentially enters a third heat exchanger, a fourth heat exchanger and an eighth heat exchanger to exchange heat with ethanol water solutions with different mass fractions and the waste gas of the ship main engine; and after flash evaporation in the flash evaporator, expanding in a second expander to do work, mixing the expanded second power generation working medium with the separated liquid phase, and then, entering a tenth heat exchanger to be condensed into saturated liquid and then entering the next cycle.
2. The marine LNG cold energy utilization combined cooling and power supply system according to claim 1, wherein: the first stage LNG cold energy is R1150 used with a first power generation medium in a power generation system.
3. The marine LNG cold energy utilization combined cooling and power supply system according to claim 1, wherein: the second-stage LNG cold energy utilizes a second power generation working medium in the power generation system to adopt an ammonia water solution with the mass fraction of 0.86.
4. The marine LNG cold energy utilization combined cooling and power supply system according to claim 1, wherein: and the third working medium pump is used for pressurizing the ammonia water solution after heat exchange with the first power generation medium of the first-stage LNG cold energy utilization power generation system, and the ammonia water solution sequentially enters the third heat exchanger, the fourth heat exchanger and the eighth heat exchanger to exchange heat with the first power generation working medium circulating in the first-stage LNG cold energy utilization power generation system, the ethanol water solution with the mass fraction of 0.6 and the ethanol water solution with the mass fraction of 0.4.
5. The marine LNG cold energy utilization combined cooling and power supply system according to claim 1, wherein: and the expanded working medium enters the first heat exchanger and the second heat exchanger for heat exchange at the ratio of 0.25 to 0.75 respectively.
6. The marine LNG cold energy utilization combined cooling and power supply system according to claim 1, wherein: the two-stage refrigeration system comprises a low-temperature refrigeration house system and a refrigeration system formed by connecting a high-temperature refrigeration house and an air conditioning system in series;
the low-temperature refrigeration house system comprises a fourth working medium pump, a fifth heat exchanger, a third heat exchanger and a first refrigeration working medium circulating in the low-temperature refrigeration house system, and the fourth working medium pump, the fifth heat exchanger and the third heat exchanger are connected in sequence through pipelines to form a closed-loop structure; the third heat exchanger takes the material flow pressurized by the third working medium pump and the material flow heated by the second heat exchanger as cold sources; the fifth heat exchanger takes air of a low-temperature refrigerator as a heat source;
the refrigeration system with the high-temperature refrigeration house connected with the air conditioning system in series comprises a fifth working medium pump, a sixth heat exchanger, a seventh heat exchanger, a fourth heat exchanger and a second refrigeration working medium circulating in the refrigeration system, and the fifth working medium pump, the sixth heat exchanger, the seventh heat exchanger and the fourth heat exchanger are connected in sequence through pipelines to form a closed-loop structure; the sixth heat exchanger takes air of a high-temperature refrigerator as a heat source; the seventh heat exchanger takes indoor air as a heat source; the fourth heat exchanger takes two streams heated by the third heat exchanger and a stream heated by the tenth heat exchanger as cold sources at the same time.
7. The marine LNG cold energy utilization combined cooling and power supply system according to claim 6, characterized in that: the first heat exchanger takes the material flow pressurized by the first working medium pump as a cold source, the second heat exchanger takes the material flow heated by the first heat exchanger as the cold source, the tenth heat exchanger takes the material flow at the outlet of the mixer as a heat source, the fourth heat exchanger takes the material flow heated by the seventh heat exchanger as a heat source, and the ninth heat exchanger takes the engine cooling water as a heat source.
8. The marine LNG cold energy utilization combined cooling and power supply system according to claim 6, wherein: the tenth heat exchanger takes the material flow pressurized by the second working medium pump as a cold source; the third heat exchanger takes the material flow heated by the fifth heat exchanger as a heat source; and the eighth heat exchanger takes the exhaust gas discharged by the main engine as a heat source.
9. The marine LNG cold energy utilization combined cooling and power supply system according to claim 6, wherein: the first refrigeration working medium in the low-temperature refrigeration house system adopts an ethanol water solution with the mass fraction of 0.6.
10. The marine LNG cold energy utilization combined cooling and power supply system according to claim 6, characterized in that: the second refrigeration working medium in the high-temperature refrigeration house and the air-conditioning system of the two-stage refrigeration system adopts 0.4 mass percent of ethanol water solution.
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| CN202215312U (en) * | 2011-08-15 | 2012-05-09 | 北京天成山泉电子科技有限公司 | LNG (liquefied natural gas) cold energy multistage recycling system suitable for ship |
| CN206158809U (en) * | 2016-09-19 | 2017-05-10 | 青岛科技大学 | System is used multipurposely to LNG power boat's cold energy |
| CN207006622U (en) * | 2016-11-14 | 2018-02-13 | 青岛远洋船员职业学院 | A kind of cold energy gradient utilization system of LNG cargo ships |
| CN109113824A (en) * | 2018-08-15 | 2019-01-01 | 江苏科技大学 | LNG Power Vessel fuel cold energy method of comprehensive utilization and its system |
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| AU2005290036B2 (en) * | 2004-09-22 | 2008-06-12 | Fluor Technologies Corporation | Configurations and methods for LPG and power cogeneration |
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| CN202215312U (en) * | 2011-08-15 | 2012-05-09 | 北京天成山泉电子科技有限公司 | LNG (liquefied natural gas) cold energy multistage recycling system suitable for ship |
| CN206158809U (en) * | 2016-09-19 | 2017-05-10 | 青岛科技大学 | System is used multipurposely to LNG power boat's cold energy |
| CN207006622U (en) * | 2016-11-14 | 2018-02-13 | 青岛远洋船员职业学院 | A kind of cold energy gradient utilization system of LNG cargo ships |
| CN109113824A (en) * | 2018-08-15 | 2019-01-01 | 江苏科技大学 | LNG Power Vessel fuel cold energy method of comprehensive utilization and its system |
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