CN108860550B - Double-power supply and propulsion system for LNG power ship and working method - Google Patents
Double-power supply and propulsion system for LNG power ship and working method Download PDFInfo
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- CN108860550B CN108860550B CN201810419792.4A CN201810419792A CN108860550B CN 108860550 B CN108860550 B CN 108860550B CN 201810419792 A CN201810419792 A CN 201810419792A CN 108860550 B CN108860550 B CN 108860550B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/20—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units
- B63H2021/202—Use of propulsion power plant or units on vessels the vessels being powered by combinations of different types of propulsion units of hybrid electric type
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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
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
- Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels
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Abstract
The invention discloses a double-power supply and propulsion system of an LNG power ship and a working method. After LNG is pressurized to supercritical pressure by a booster pump, the LNG is heated into ultrahigh pressure and high-temperature natural gas by using seawater and cooling water of a main engine cylinder sleeve of a ship as heat sources to expand and do work in a turbine, and a generator is driven to generate electricity to serve as one of ship navigation power; meanwhile, the natural gas expanded in the turbine enters a ship host system to be combusted to serve as another power for ship navigation, so that the LNG power ship can be driven by electric power or gas according to different navigation working conditions. The invention fully utilizes the waste heat released after seawater and LNG are combusted as the heat source for LNG regasification and turbine power generation, thereby not only further improving the utilization efficiency of LNG cold energy and heat energy, but also obviously reducing the cold energy and heat energy discharged to the environment when the traditional LNG power ship sails, and protecting the ocean and atmospheric environment to the maximum extent.
Description
Technical Field
The invention relates to a double-power supply and propulsion system and process for an LNG power ship, and belongs to the technical field of energy recovery and utilization.
Background
At present, heavy oil is still the first choice for most marine fuels, but the specific gravity of LNG-powered vessels is increasing year by year, in the large context of controlling carbon emissions in the global shipping market. Relevant studies have shown that by 2030, this is 9% of unconventional fuels and a major rise in 2050, and a large share of all boat-type fuels. However, in the development process of the LNG power ship, the high-grade energy of LNG is simply utilized, and in most cases, the LNG is only combusted to provide power for the ship, and other grade energy is not combined, so that the LNG is systematically and efficiently utilized according to the characteristics of LNG. In addition, although there are some energy comprehensive utilization systems for LNG, most of them are designed for ships.
At present, the LNG differential pressure energy utilization mode is mainly power generation. The patent application No. 201610063898.6 discloses a natural gas pressure differential energy recovery-producing LNG system and process. The system is provided with a heat exchange device, an expansion unit, a cold energy recovery unit and a gas-liquid separation device which are connected between a high-pressure natural gas main line and a low-pressure natural gas branch line through pipelines. The high-pressure natural gas enters the expansion unit to drive the expansion machine to work after being subjected to heat exchange and cooling, and the generator connected with the expansion machine works accordingly. The low-temperature low-pressure natural gas and the liquefied natural gas come out of the expansion machine, the liquefied natural gas enters the cold energy recovery unit, and the low-temperature low-pressure natural gas enters the low-pressure natural gas pipeline through heat exchange with the high-pressure natural gas. The high-pressure natural gas is used for heating the expanded low-temperature low-pressure natural gas, so that the temperature of the high-pressure natural gas at the inlet of the expander is reduced, and the power generation efficiency is reduced.
Similarly, the patent of application No. 201520364530.4 discloses a system for efficiently utilizing pressure energy and cold energy of natural gas in a pipe network, which recovers the pressure energy of natural gas in a high-pressure natural gas pipeline to generate electricity and recovers the cold energy of natural gas in the pipe network to make ice. Although the patent utilizes the pressure difference energy and the cold energy of the natural gas, the brine cannot be recycled in the cold accumulation process, a large amount of fresh water needs to be consumed, and the generated electric energy part is used for returning the temperature of the natural gas outlet, so that the efficiency is low. Since the freezing point of the brine is lower than 0 ℃, the low-temperature natural gas coming out of the brine tank enters the water storage tank, which may cause the water storage tank to freeze, and cause the damage of equipment. And because the flow of the urban natural gas pipe network changes along with the gas consumption of the city, the system is unstable.
Disclosure of Invention
The present invention aims to overcome the defects and problems of the prior art and provide a double power supply and propulsion system for an LNG-powered ship.
The invention utilizes high-temperature and high-pressure natural gas formed by heat exchange with propane and cooling water of a main engine cylinder sleeve of a ship after pressurization to expand and reduce pressure in a turbine to do work, and drives a generator to generate electricity to provide power for ship navigation. The natural gas after doing work in the turbine enters a main engine of the ship to be combusted so as to provide power for the navigation of the ship. The LNG power ship can be freely and selectively propelled by a main engine of the ship or electrically propelled according to the navigation requirement. In addition, the heat energy in the seawater is utilized to heat the propane after heat exchange with the LNG. The energy consumption of the ship propulsion system is reduced, and the economy and the environmental protection of the whole operation of the ship are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-power supply and propulsion system of an LNG power ship and a working method thereof comprise an LNG power supply subsystem and an electric power supply subsystem, wherein the LNG power supply subsystem is formed by sequentially connecting an LNG liquid storage tank 1, a booster pump 3, an inlet a and an outlet c of an LNG vaporizer 5, an inlet g and an outlet h of a first heat exchanger 6, an inlet k and an outlet l of a turbine 7 and a fuel inlet m of a ship main engine 9 by pipelines; the outlets d and f of the LNG vaporizer 5 are also sequentially connected with the inlet v and the outlet u of the propane liquid storage tank 16, the inlet t and the outlet s of the second heat exchanger 14, and the inlets b and e of the LNG vaporizer 5 by pipelines; the inlet i of the first heat exchanger 6 is also connected with the outlet o of the cooling water cylinder sleeve 10 of the marine main engine through a pipeline, and the outlet j is also connected with the inlet p of the cooling water cylinder sleeve 10 of the marine main engine through a pipeline; the electric power supply subsystem is formed by sequentially connecting a power output end x of the turbine 7, a generator 18, a storage battery 19, an input end w of a power conversion device 20, an output end z and a propeller 21; the input end y of the power conversion device 20 is also connected with the power output end n of the marine main engine 9.
Further, a first electromagnetic valve 2 is connected between the liquid storage tank 1 and the booster pump 3 through a pipeline, and a pressure gauge 4 is connected between the booster pump 3 and the LNG vaporizer 5 through a pipeline.
Further, a second electromagnetic valve 17 is connected between the inlets b and e of the LNG vaporizer 5 and the outlet s of the second heat exchanger 14 by adopting a pipeline; a third electromagnetic valve 15 is connected between the propane liquid storage tank 16 and the inlet t of the second heat exchanger 14 through a pipeline.
Further, an inlet r of the second heat exchanger 14 is also sequentially connected with a flow meter 13, a pump 12 and a fourth electromagnetic valve 11 by pipelines; the heating medium in the second heat exchanger 14 is seawater.
Further, the LNG vaporizer 5 is a three-channel vaporizer, the inlet a and the outlet c are inlets and outlets of a first channel, the inlet b and the outlet d are inlets and outlets of a second channel, the inlet e and the outlet f are inlets and outlets of a third channel, the first channel is a cold fluid LNG channel, the inlets b and e of the second channel and the third channel are connected by a manifold, and the outlets d and f are connected with the main pipeline after being connected by the manifold to serve as a hot fluid propane channel.
Further, the inlet of the first heat exchanger 6 and the outlet o of the cooling water cylinder sleeve 10 of the marine main engine are connected with a fifth electromagnetic valve 8 by adopting a pipeline; the heating medium in the first heat exchanger 6 adopts cooling water of a main engine cylinder sleeve of a ship.
The invention discloses a working method of a double-power supply and propulsion system of an LNG power ship, which comprises the following two subsystems: the LNG power supply subsystem and the electric power supply subsystem;
the working mode of the LNG power supply subsystem is as follows: LNG at-160 ℃ in the LNG storage tank 1 enters the booster pump 3 through the first electromagnetic valve 2 and is converted into high-pressure LNG through pressurization, the high-pressure LNG enters the high-efficiency compact LNG vaporizer 5 through the inlet a of the high-efficiency compact LNG vaporizer 5 to fully exchange heat with propane, the temperature of the LNG is raised to be close to 0 ℃, the LNG enters the first heat exchanger 6 to exchange heat with cooling water of a ship main engine cylinder sleeve at about 80 ℃ in the ship main engine cooling water cylinder sleeve 10 to be raised to high-temperature high-pressure natural gas, the high-temperature high-pressure natural gas enters the turbine 7 to be expanded and work, then the pressure and the temperature of the high-temperature high-pressure natural gas are reduced, and. Meanwhile, propane after heat exchange with LNG enters a propane liquid storage tank 16 from outlets d and f of the LNG vaporizer 5, and then enters a second heat exchanger 14 from the propane liquid storage tank 16 to exchange heat with seawater and raise temperature, and then enters the LNG vaporizer 5; seawater is pumped into the second heat exchanger 14 through an inlet r of the second heat exchanger 14 by the pump 12, exchanges heat with propane, and is discharged into the sea through an outlet q of the second heat exchanger 14;
the working mode of the electric power supply subsystem is as follows: the high-temperature and high-pressure natural gas entering the turbine 7 expands to do work, the generator 18 is driven to work to generate electricity, the generated electric energy is stored in the storage battery 19, and the electric energy in the storage battery 19 and the kinetic energy in the ship main engine 9 are determined by the power conversion device 20 according to the navigation requirement and distributed to the propeller 21 to work.
Drawings
Fig. 1 is a schematic diagram of the principle of the embodiment of the present invention.
In the figure: the system comprises an LNG storage tank, 2 parts of a first electromagnetic valve, 3 parts of a booster pump, 4 parts of a pressure gauge, 5 parts of an LNG vaporizer, 6 parts of a first heat exchanger, 7 parts of a turbine, 8 parts of a fifth electromagnetic valve, 9 parts of a ship main engine, 10 parts of a ship main engine cooling water cylinder sleeve, 11 parts of a fourth electromagnetic valve, 12 parts of a pump, 13 parts of a flow meter, 14 parts of a second heat exchanger, 15 parts of a third electromagnetic valve, 16 parts of a propane storage tank, 17 parts of a second electromagnetic valve, 18 parts of a generator, 19 parts of a storage battery, 20 parts of a power conversion device and 21 parts of a propeller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1: the LNG power ship double-power supply and propulsion system comprises an LNG power supply subsystem and an electric power supply subsystem, wherein the LNG power supply subsystem is formed by sequentially connecting an LNG liquid storage tank 1, a booster pump 3, an inlet a and an outlet c of an LNG vaporizer 5, an inlet g and an outlet h of a first heat exchanger 6, an inlet k and an outlet l of a turbine 7 and a fuel inlet m of a ship main machine 9 by pipelines; the outlets d and f of the LNG vaporizer 5 are also sequentially connected with the inlet v and the outlet u of the propane liquid storage tank 16, the inlet t and the outlet s of the second heat exchanger 14, and the inlets b and e of the LNG vaporizer 5 by pipelines; an inlet i of the first heat exchanger 6 is connected with an outlet o of the cooling water cylinder sleeve 10 of the marine main engine through a pipeline, and an outlet j of the first heat exchanger is connected with an inlet p of the cooling water cylinder sleeve 10 of the marine main engine through a pipeline; the electric power supply subsystem is formed by sequentially connecting a power output end x of the turbine 7, a generator 18, a storage battery 19, an input end w of a power conversion device 20, an output end z and a propeller 21; the input end y of the power conversion device 20 is also connected with the power output end n of the marine main engine 9.
Still adopt pipe connection to have first solenoid valve 2 between liquid storage pot 1 and the booster pump 3, still adopt pipe connection to have manometer 4 between booster pump 3 and the LNG vaporizer 5.
A second electromagnetic valve 17 is connected between the inlets b and e of the LNG vaporizer 5 and the outlet s of the second heat exchanger 14 by pipelines; a third electromagnetic valve 15 is connected between the propane liquid storage tank 16 and the inlet t of the second heat exchanger 14 through a pipeline.
The inlet r of the second heat exchanger 14 is also sequentially connected with a flowmeter 13, a pump 12 and a fourth electromagnetic valve 11 by pipelines; the heating medium in the second heat exchanger 14 is seawater.
The LNG vaporizer 5 is a three-channel vaporizer, an inlet a and an outlet c are inlets and outlets of a first channel, an inlet b and an outlet d are inlets and outlets of a second channel, an inlet e and an outlet f are inlets and outlets of a third channel, the first channel is a cold fluid LNG channel, the inlets b and the e of the second channel and the three channels are connected by using manifolds, and the outlets d and the f are connected with a main pipeline after being connected by using manifolds to serve as hot fluid propane channels.
The inlet of the first heat exchanger 6 and the outlet o of the cooling water cylinder sleeve 10 of the marine main engine are also connected with a fifth electromagnetic valve 8 by adopting a pipeline; the heating medium in the first heat exchanger 6 adopts cooling water of a main engine cylinder sleeve of a ship.
A working method of a double-power supply and propulsion system of an LNG power ship specifically comprises the following two modes:
(1) the working mode of the LNG power supply subsystem is as follows: LNG at-160 ℃ in the LNG storage tank 1 enters the booster pump 3 through the first electromagnetic valve 2 and is converted into high-pressure LNG through pressurization, the high-pressure LNG enters the high-efficiency compact LNG vaporizer 5 through the inlet a of the high-efficiency compact LNG vaporizer 5 to fully exchange heat with propane, the temperature of the LNG is raised to be close to 0 ℃, the LNG enters the first heat exchanger 6 to exchange heat with cooling water of a ship main engine cylinder sleeve at about 80 ℃ in the ship main engine cylinder cooling water sleeve 10 to be raised to high-temperature high-pressure natural gas, the high-temperature natural gas enters the turbine 7 to expand and work, the pressure and the temperature of the natural gas are reduced, the natural gas enters the ship main engine 9 through the outlet l of the turbine 7 to be combusted into kinetic energy of a ship, and the combusted. Meanwhile, the propane liquid after heat exchange with the LNG enters a propane liquid storage tank 16 from outlets d and f of the LNG vaporizer 5, and then the propane enters a second heat exchanger 14 from the propane liquid storage tank 16 to exchange heat with seawater and vaporize at a raised temperature, and then enters the LNG vaporizer 5; seawater is pumped into the second heat exchanger 14 through an inlet r of the second heat exchanger 14 by the pump 12, exchanges heat with propane, and is discharged into the sea through an outlet q of the second heat exchanger 14;
(2) the working mode of the electric power supply subsystem is as follows: the high-temperature and high-pressure natural gas entering the turbine 7 expands to do work, a rotor in the turbine 7 rotates to drive the generator 18 to work and generate electricity, the generated electric energy is stored in the storage battery 19, and the electric energy in the storage battery 19 and the kinetic energy in the ship main engine 9 are determined by the power conversion device 20 according to the navigation requirement and distributed to the propeller 21 to work.
The foregoing is only a preferred embodiment of the present invention. The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such equivalent changes and modifications as would be obvious to one skilled in the art be included herein are deemed to be within the scope and spirit of the present invention as defined by the appended claims.
Claims (9)
1. The utility model provides a double dynamical supply of LNG power ship and propulsion system which characterized in that: the LNG power supply system is composed of an LNG power supply subsystem and an electric power supply subsystem; the LNG power supply subsystem is formed by sequentially connecting an LNG liquid storage tank (1), a booster pump (3), an inlet a and an outlet c of an LNG vaporizer (5), an inlet g and an outlet h of a first heat exchanger (6), an inlet k and an outlet l of a turbine (7) and a fuel inlet m of a marine main engine (9) by pipelines; outlets d and f of an LNG vaporizer (5) in the LNG power supply subsystem are communicated by adopting a manifold and are sequentially connected with an inlet v and an outlet u of a propane liquid storage tank (16), an inlet t and an outlet s of a second heat exchanger (14) and manifold inlets of inlets b and e of the LNG vaporizer (5) through pipelines; the inlet i of the first heat exchanger (6) is connected with the outlet o of the cooling water cylinder sleeve (10) of the marine main engine through a pipeline, and the outlet j is also connected with the inlet p of the cooling water cylinder sleeve (10) of the marine main engine through a pipeline; the electric power supply subsystem is formed by sequentially connecting a power output end x of the turbine (7), a generator (18), a storage battery (19), an input end w and an output end z of a power conversion device (20) and a propeller (21); the input end y of the power conversion device (20) is also connected with the power output end n of the marine main engine (9).
2. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: and a first electromagnetic valve (2) is connected between the LNG liquid storage tank (1) and the booster pump (3) through a pipeline.
3. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: and a pressure gauge (4) is connected between the booster pump (3) and the LNG vaporizer (5) through a pipeline.
4. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: and a second electromagnetic valve (17) is connected between the inlets b and e of the LNG vaporizer (5) and the outlet s of the second heat exchanger (14) by adopting pipelines.
5. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: and a third electromagnetic valve (15) is connected between the propane liquid storage tank (16) and the inlet t of the second heat exchanger (14) by adopting a pipeline.
6. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: the inlet r of the second heat exchanger (14) is also sequentially connected with a flowmeter (13), a pump (12) and a fourth electromagnetic valve (11) by pipelines; wherein the heating medium in the second heat exchanger (14) adopts seawater.
7. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: the LNG vaporizer (5) is a three-channel vaporizer, wherein an inlet a and an outlet c are inlets and outlets of a first channel, an inlet b and an outlet d are inlets and outlets of a second channel, an inlet e and an outlet f are inlets and outlets of a third channel, the first channel is a cold fluid LNG channel, the inlets b and e of the second channel and the three channels are connected by adopting manifolds, and the outlets d and f are connected with a main pipeline after being connected by adopting manifolds to be used as hot fluid propane channels.
8. The LNG-powered ship dual-power supply and propulsion system of claim 1, wherein: the inlet of the first heat exchanger (6) and the outlet o of the cooling water cylinder sleeve (10) of the marine main engine are also connected with a fifth electromagnetic valve (8) by adopting a pipeline; wherein the heating medium in the first heat exchanger (6) adopts cooling water of a main engine cylinder jacket of the ship.
9. A working method of a double-power supply and propulsion system of an LNG power ship is characterized in that: the method comprises the following two working modes:
(A) the working mode of the LNG power supply subsystem is as follows: LNG in the LNG liquid storage tank (1) enters a booster pump (3) through a first electromagnetic valve (2) and is changed into low-temperature high-pressure LNG through pressurization, then enters an LNG vaporizer (5) to be fully exchanged with propane to be changed into high-pressure natural gas close to 0 ℃, then enters a first heat exchanger (6) to be exchanged with cooling water of a ship main engine cylinder sleeve in a ship main engine cooling water cylinder sleeve (10) to be exchanged with heat and heated to be changed into high-temperature high-pressure natural gas, then enters a turbine (7) to be expanded and acted to be changed into low-temperature low-pressure natural gas, and then enters a ship main engine (9) to be combusted into; meanwhile, propane after heat exchange with LNG enters a propane liquid storage tank (16) from the LNG vaporizer (5), and then enters a second heat exchanger (14) from the propane liquid storage tank (16) to be heated and then enters the LNG vaporizer (5); seawater is pumped into a second heat exchanger (14) by a pump (12), exchanges heat with propane and is discharged into the sea;
(B) the working mode of the electric power supply subsystem is as follows: the high-temperature and high-pressure natural gas enters the turbine (7) to do work through expansion, the generator (18) is driven to work, the generated electric energy is stored in the storage battery (19), and the electric energy in the storage battery (19) and the kinetic energy in the ship main engine (9) are distributed to the propeller (21) to work through the power conversion device (20) according to the navigation requirement.
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| CN109878675A (en) * | 2019-02-28 | 2019-06-14 | 哈尔滨工程大学 | A kind of bi-motor coaxial-type pneumoelectric mixing ship power system |
| CN109878676A (en) * | 2019-02-28 | 2019-06-14 | 哈尔滨工程大学 | A kind of double paddle bavin pneumoelectric mixing ship power systems of three machines |
| CN109878682A (en) * | 2019-02-28 | 2019-06-14 | 哈尔滨工程大学 | A kind of double paddle pneumoelectric mixing ship power systems of the single machine of carrying fuel battery |
| CN109911161A (en) * | 2019-02-28 | 2019-06-21 | 哈尔滨工程大学 | A kind of double paddle pneumoelectric mixing ship power systems of single machine |
| CN111271599B (en) * | 2020-01-20 | 2021-09-21 | 江苏科技大学 | LNG power luxury cruise ship garbage treatment system and method |
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