CN111874200B - LNG ship heat energy comprehensive utilization system - Google Patents
LNG ship heat energy comprehensive utilization system Download PDFInfo
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- CN111874200B CN111874200B CN202010646675.9A CN202010646675A CN111874200B CN 111874200 B CN111874200 B CN 111874200B CN 202010646675 A CN202010646675 A CN 202010646675A CN 111874200 B CN111874200 B CN 111874200B
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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
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
- B63H21/383—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling cooling-water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J1/00—Arrangements of installations for producing fresh water, e.g. by evaporation and condensation of sea water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
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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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- 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
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
- B63J2002/125—Heating; Cooling making use of waste energy
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention relates to a heat energy comprehensive utilization system of an LNG ship, which comprises an LNG engine, a closed circulating heat exchanger, a waste gas heat exchanger, a tube bundle type heat exchanger, a CNG gas cylinder, an LNG gas cylinder, a heat dissipation coil, a low-temperature cooling water cabinet, an evaporative desalination machine and a seawater pump, wherein the LNG engine provides heat energy for the whole system, and the LNG gas cylinder, the tube bundle heat exchanger and the CNG gas cylinder form a self-constant-pressure self-conversion module; the heat dissipation coil pipe forms a cabin temperature constant temperature module which is used for maintaining the temperature of the cabin to be constant; the waste gas heat exchanger, the evaporative desalination machine and the seawater pump form a desalination module; the closed circulation heat exchanger and the seawater pump form a closed circulation cooling module, and the low-temperature cooling water tank forms an open circulation cooling module for ensuring good cooling of the LNG engine. The invention utilizes the heat energy generated by the work of the LNG engine and the cold energy generated by the conversion of the LNG to the CNG, and realizes the functions of self-pressurization and self-conversion of the system, constant cabin temperature, cooling of the engine and efficient light-dimming by reasonably controlling the flow of high-temperature and low-temperature cooling water.
Description
Technical Field
The invention relates to the technical field of heat energy application, in particular to a heat energy comprehensive utilization system of an LNG ship.
Background
As is well known, ships powered by fossil energy cause serious pollution, so that the development of green ships is imminent, and the application of clean energy power systems is the best solution.
Liquefied Natural Gas (LNG) is used as a clean energy source, releases a large amount of cold energy when vaporized, and basically does not produce a pollution gas when burned as a fuel. However, the existing LNG ships often cannot effectively utilize the cold energy. The low-grade heat energy and the cold energy of the LNG can be expanded and utilized, so that the energy utilization efficiency can be improved, and the high-efficiency development and utilization of new energy can be realized. The invention takes the above as a starting point, and invents a set of complete comprehensive utilization system for heat energy of LNG ships.
Disclosure of Invention
The invention aims to solve the technical problem of providing an LNG ship heat energy comprehensive utilization system aiming at the technical blank in the prior art, which utilizes high-temperature cooling water generated by an LNG engine and cold energy generated when LNG is vaporized, realizes the functions of constant temperature, cooling and desalination of a cabin by reasonably matching the high-temperature cooling water with low-temperature cooling, has closed cooling circulation and open cooling circulation, and can ensure the cooling efficiency of the engine and improve the reliability of work.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an LNG ship heat energy comprehensive utilization system comprises an LNG engine, a closed cycle heat exchanger, a waste gas heat exchanger, a tube bundle heat exchanger, a CNG gas cylinder, an LNG gas cylinder, a heat dissipation coil, a low-temperature cooling water cabinet, an evaporative desalination machine and a seawater pump;
the LNG gas cylinder, the tube bundle type heat exchanger and the CNG gas cylinder are sequentially connected, and the gas outlet end of the CNG gas cylinder is connected with the gas inlet end of the LNG engine;
the seawater pump is connected with the closed circulating heat exchanger, and high-temperature cooling water of the LNG engine enters the closed circulating heat exchanger through a closed circulating cooling water pipeline V to exchange heat with low-temperature seawater and then flows back to the LNG engine; the low-temperature seawater becomes high-temperature cooling water after heat exchange, part of the high-temperature cooling water enters the tube bundle heat exchanger through a pipeline II, and under the action of the high-temperature cooling water, liquefied natural gas in the LNG gas cylinder absorbs heat through the tube bundle heat exchanger, is converted into gaseous natural gas from constant pressure and is compressed and stored in a CNG gas cylinder, and is conveyed to the LNG engine through a pipeline I;
the tube bundle type heat exchanger, the heat dissipation coil and the low-temperature cooling water cabinet are sequentially connected, part of high-temperature cooling water is changed into low-temperature cooling water after heat exchange through the tube bundle type heat exchanger, the other part of high-temperature cooling water from the closed circulation heat exchanger is mixed with the low-temperature cooling water and then flows to the heat dissipation coil to dissipate constant heat and maintain the temperature of the cabin constant, and then the low-temperature cooling water flows into the low-temperature cooling water cabinet;
high-temperature waste gas generated by the LNG engine is conveyed to the waste gas heat exchanger through a pipeline III, and high-temperature cooling water from a pipeline II is further heated and then conveyed to the evaporative desalination machine; meanwhile, the seawater pump conveys seawater into an evaporative type desalination machine, and the evaporative type desalination machine is partially vacuumized to reduce the boiling point of the seawater; fresh water generated by the evaporative fresh water generator is stored for ship production and life, and cooling water after heat exchange is conveyed to the low-temperature cooling water tank.
In the scheme, a temperature sensor and a screwed valve V4 are arranged on an inlet pipeline of the heat dissipation coil and are controlled in a correlated manner to ensure that the temperature of the mixed low-temperature cooling water is 24-26 ℃.
In the above scheme, the end of the pipeline II is provided with a three-way valve V9, one outlet of the three-way valve V9 is connected to the inlet of the tube bundle heat exchanger, and the other outlet is connected to the inlet of the waste gas heat exchanger.
In the scheme, a three-way valve V10 is arranged on a pipeline between the tube bundle heat exchanger and the radiating tube disc, one inlet of the three-way valve V10 is connected with the low-temperature cooling water outlet of the tube bundle heat exchanger, and the other inlet is a high-temperature cooling water inlet.
In the above scheme, the outlet of the low-temperature cooling water tank is connected to the LNG engine through a pipeline IV, and is used for supplementing low-temperature cooling water to the LNG engine; and a four-way valve V13 is arranged on the pipeline II, one inlet of the four-way valve V13 is connected with the high-temperature cooling water outlet from the pipeline IV, one inlet of the four-way valve V13 is connected with the high-temperature cooling water outlet of the closed circulation heat exchanger, one outlet of the four-way valve V9 is connected with the inlet of the three-way valve V10, and the other outlet of the four-way valve V13 is connected with the high-temperature cooling water inlet of the three-way valve V10.
In the above scheme, a three-way valve V12 is arranged behind the seawater pump, an inlet of the three-way valve V12 is connected with the seawater pump, one outlet of the three-way valve V12 is connected with an inlet of the closed cycle heat exchanger, and the other outlet is connected with an inlet of the evaporative desalination machine.
In the scheme, a three-way valve V11 is arranged at the inlet of the low-temperature cooling water tank; an inlet of the three-way valve V11 is connected with an outlet of the heat dissipation coil, and a flowmeter F1 is arranged between the three-way valve V11 and the heat dissipation coil; the other inlet of the three-way valve V11 is connected with the outlet of the evaporative desalination machine, and a flow meter F2 is arranged between the three-way valve V11 and the evaporative desalination machine; the outlet of the three-way valve V11 is connected with the low-temperature cooling water tank.
In the scheme, a flow meter F3 is arranged on the pipeline II.
In the above scheme, a safety valve V16 is arranged on the pipeline iii to ensure the safety of the pipeline.
In the above scheme, the tube bundle radiator is equipped with electric heating wire for maintain high temperature cooling water temperature, when high temperature cooling water temperature is not enough to make LNG in the LNG gas cylinder to the CNG in the CNG gas cylinder from the constant pressure conversion, electric heating wire gets into work.
The invention has the beneficial effects that:
1. the invention realizes the functions of self-pressurization self-conversion, cabin temperature constancy, engine cooling and high-efficiency light-weight control of the system by reasonably controlling the flow of high-temperature cooling water and low-temperature cooling water by utilizing the heat energy generated by the work of the LNG engine and the cold energy generated by the conversion of LNG to CNG. The corresponding module work can be completed without consuming more energy in other forms, thereby being beneficial to the comprehensive utilization of heat energy and having low operation cost.
2. The high-temperature cooling water of the desalination module is subjected to heat exchange again by adopting the ship waste gas, so that the grade of a heat source entering the desalination device is improved, and the desalination efficiency is improved.
3. The LNG engine cooling adopts open circulation and closed circulation, and sets primary cooling and secondary cooling, thereby ensuring the working reliability of the LNG engine to the maximum extent.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a structural view of an LNG ship heat energy comprehensive utilization system according to the present invention.
In the figure: 1. an LNG engine; 2. a closed cycle heat exchanger; 3. an exhaust gas heat exchanger; 4. a CNG gas cylinder; 5. a tube bundle heat exchanger; 6. an LNG gas cylinder; 7. a heat-dissipating coil pipe; 8. a low-temperature cooling water tank; 9. an evaporative desalination machine; 10. a sea water pump; 11. a seawater filter;
v1, V2, V3, V4, V5, V6, V7, V8, screw valves; v9, V10, V11, V12, three-way valve; v13 and a four-way valve; v14, V15, V16 and a safety valve; a V20, V21 solenoid valve; f1, F2, F3 and a flowmeter.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the heat energy comprehensive utilization system for the LNG ship provided by the invention comprises an LNG engine 1, a closed cycle heat exchanger 2, an exhaust gas heat exchanger 3, a tube bundle heat exchanger 5, a CNG gas cylinder 4, an LNG gas cylinder 6, a heat radiation coil 7, a cryogenic cooling water tank 8, an evaporative desalination machine 9, and a seawater pump 10. Wherein, LNG engine 1 provides heat energy for entire system, and LNG boats and ships heat energy comprehensive utilization system mainly has four functional module: 1) the self-constant pressure self-conversion module consists of an LNG gas cylinder 6, a tube bundle heat exchanger and a CNG gas cylinder 4 and is used for realizing the self-constant pressure conversion from LNG to CNG; 2) the cabin temperature constant temperature module consists of a heat radiation coil 7 and is used for maintaining the temperature of the cabin to be constant; 3) a desalination module consisting of a waste gas heat exchanger 3, an evaporative desalination machine 9 and a seawater pump 10; 4) a cooling module: the system comprises a closed circulation cooling module consisting of a closed circulation heat exchanger 2 and a seawater pump 10 and an open circulation cooling module consisting of a low-temperature cooling water tank 8, and is used for ensuring the good cooling of the LNG engine 1.
CNG (compressed natural gas) is arranged in the pipeline I; high-temperature cooling water is arranged in the pipeline II; the high-temperature waste gas of the LNG engine 1 is in the pipeline III; and low-temperature cooling water is arranged in the pipeline IV.
And the tail end of the pipeline II is provided with a three-way valve V9, one outlet of the three-way valve V9 is connected with the inlet of the bundle heat exchanger 5, and the other outlet of the three-way valve V9 is connected with the inlet of the waste gas heat exchanger 3.
A three-way valve V10 is arranged on a pipeline between the tube bundle type heat exchanger 5 and the radiating tube plate, one inlet of the three-way valve V10 is connected with a low-temperature cooling water outlet of the tube bundle type heat exchanger 5, and the other inlet is a high-temperature cooling water inlet.
The inlet of the low-temperature cooling water cabinet 8 is provided with a three-way valve V11, one inlet of the three-way valve V11 is connected with the outlet of the heat dissipation coil 7, the other inlet of the three-way valve V11 is connected with the outlet of the evaporative light-making machine 9, and the outlet of the three-way valve V11 is connected with the low-temperature cooling water cabinet 8.
A three-way valve V12 is arranged behind the seawater pump 10, the inlet of the three-way valve V12 is connected with the seawater pump 10, one outlet of the three-way valve V12 is connected with the inlet of the closed circulation heat exchanger 2, and the other outlet is connected with the inlet of the evaporative desalination machine 9.
And a four-way valve V13 is arranged on the pipeline II, one inlet of the four-way valve V13 is connected with the high-temperature cooling water outlet from the pipeline IV, one inlet of the four-way valve V13 is connected with the high-temperature cooling water outlet of the closed circulation heat exchanger 2, one outlet of the four-way valve V9 is connected with the inlet of the three-way valve V10, and the other outlet of the four-way valve V13 is connected with the high-temperature cooling water inlet of the three-way valve V10.
In the self-constant pressure self-conversion module, an LNG gas cylinder 6, a tube bundle type heat exchanger 5 and a CNG gas cylinder 4 are sequentially connected, and the gas outlet end of the CNG gas cylinder 4 is connected with the gas inlet end of an LNG engine 1. LNG is typically stored in-157 c cylinders and converted to CNG by thermal vaporization. In order to realize the function of converting LNG into CNG from constant pressure, the electromagnetic valve V20 is opened, the compressed natural gas stored in the CNG gas cylinder 4 enters the LNG engine 1, and the LNG engine 1 starts to operate. After the LNG engine 1 normally operates for a period of time, the seawater enters the closed circulation heat exchanger 2 through the screwed valve V8 and the seawater filter 11 under the action of the seawater pump 10, and meanwhile, the high-temperature cooling water of the LNG engine 1 enters the closed circulation heat exchanger 2 through the closed circulation cooling water pipeline V to exchange heat with the low-temperature seawater and then flows back to the LNG engine 1. The low-temperature seawater absorbs heat to become high-temperature cooling water (at the temperature of 60 ℃), part of the high-temperature cooling water enters the tube bundle heat exchanger 5 through the electromagnetic valve V21 through the pipeline II, and under the action of the high-temperature cooling water, liquefied natural gas in the LNG cylinder 6 absorbs heat through the tube bundle heat exchanger 5, is converted into gaseous natural gas from constant pressure, is compressed and stored in the CNG cylinder 4, and is distributed to the LNG engine 1 through the pipeline I. The flow of high-temperature cooling water flowing into the tube bundle type heat exchanger 5 is adjusted through the three-way valve V9, the volume of LNG converted into CNG is controlled, and accurate control is achieved.
In the cabin temperature constant temperature module, a tube bundle type heat exchanger 5, a heat dissipation coil 7 and a low-temperature cooling water cabinet 8 are connected in sequence. When part of the high-temperature cooling water is used for maintaining the self-constant pressure conversion from the LNG to the CNG, the high-temperature cooling water is changed into low-temperature cooling water (with the temperature of 15 ℃) and the other part of the high-temperature cooling water (with the temperature of 60 ℃), is mixed with the low-temperature cooling water through the screw valve V5 and then flows to the heat dissipation coil 7. The pipeline is provided with a temperature sensor which is in associated control with a screwing valve V4 on the pipeline, so that the temperature of the mixed low-temperature cooling water is ensured to be 24-26 ℃, the low-temperature cooling water (with the temperature of 24-26 ℃) enters the heat dissipation coil 7, constant heat is dissipated, and the temperature of the cabin is kept constant. Then the low-temperature cooling water (with the temperature of 24-26 ℃) flows into the low-temperature cooling water cabinet 8.
In the desalination module, the evaporation desalination machine 9 is partially vacuumized to reduce the boiling point of the seawater to 65-70 ℃. In order to realize the function of producing fresh water, high-temperature waste gas generated by the LNG engine 1 is conveyed to the waste gas heat exchanger 3 through the pipeline III, high-temperature cooling water (with the temperature of 60 ℃) from the pipeline II is further heated to 90-95 ℃, then is conveyed to the evaporative type fresh water producing machine 9 through the screwed valve V6, and the waste gas cooled in the waste gas heat exchanger 3 is discharged through the screwed valve V7. Meanwhile, the seawater pump 10 delivers seawater into the evaporative desalination machine 9. The fresh water produced by the evaporative desalination machine 9 is stored for ship production and life.
The high-temperature cooling water (the temperature is 90-95 ℃) is changed into the high-temperature cooling water with the temperature of 65 ℃ after passing through the evaporative light-making machine 9, the high-temperature cooling water (the temperature is 65 ℃) enters the low-temperature cooling water cabinet 8 through the screwed valve V1 and the three-way valve V11, and the high-temperature cooling water and the three-way valve V11 are mixed to form the cooling water with the temperature of 30-40 ℃.
In the engine cooling module, closed circulation cooling is primary cooling, and heat exchange is carried out through outboard seawater. The open cycle is a two-stage cooling cycle, high-temperature cooling water forms low-temperature cooling water after heat exchange through the constant temperature system and the light-making system and is stored in the low-temperature cooling water tank 8, and an outlet of the low-temperature cooling water tank 8 is connected to the LNG engine 1 through a pipeline IV and used for supplementing the low-temperature cooling water to the LNG engine 1. When the heat load of the LNG engine 1 is low, only the primary cooling circulation is started, at the moment, low-temperature cooling water (with the temperature of 30-40 ℃) in the low-temperature cooling water tank 8 is discharged out of a board through the screwed valve V3, and the LNG engine 1 can be cooled well by closed circulation cooling water; when the heat load of the LNG engine 1 is high, the primary cooling circulation and the secondary cooling circulation are simultaneously started, at the moment, the pipeline IV screwed valve V2 is opened, and low-temperature cooling water (with the temperature of 30-40 ℃) in the low-temperature cooling water tank 8 enters the engine through the pipeline IV, so that the LNG engine 1 can achieve good cooling, the cooling efficiency of the engine can be ensured, and the working reliability can be improved. Meanwhile, low-temperature cooling water (with the temperature of 30-40 ℃) is cooled to become high-temperature cooling water (with the temperature of 60 ℃) and then enters a pipeline II through a four-way valve V13, and then enters other modules, so that the LNG heat energy comprehensive utilization system can better run.
Further optimizing, the tube bundle type radiator is provided with an electric heating wire for maintaining the temperature of high-temperature cooling water, and when the temperature of the high-temperature cooling water is not enough to convert LNG in the LNG cylinder 6 into CNG in the CNG cylinder 4 from constant pressure, the electric heating wire works.
Further preferably, a flow meter F1 is arranged between the three-way valve V11 and the heat dissipation coil 7. A flow meter F2 is provided between the three-way valve V11 and the evaporative desalination device 9. And a flow meter F3 is arranged on the pipeline II.
Further optimization, the surface of the pipeline is covered with the heat-insulating layer, so that heat loss in the pipeline flowing process is prevented.
Further optimizing, LNG steam bottle 6 is equipped with relief valve V14, and the CNG steam bottle is equipped with relief valve V15.
Further optimizing, each screwing valve in the system can adjust the opening of the valve according to the change of the temperature sensor, and the heat flow flowing into each device is controlled, so that the accurate control and stable operation are realized.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An LNG ship heat energy comprehensive utilization system is characterized by comprising an LNG engine, a closed cycle heat exchanger, a waste gas heat exchanger, a tube bundle type heat exchanger, a CNG gas cylinder, an LNG gas cylinder, a heat dissipation coil, a low-temperature cooling water cabinet, an evaporative desalination machine and a seawater pump;
the LNG gas cylinder, the tube bundle type heat exchanger and the CNG gas cylinder are sequentially connected, and the gas outlet end of the CNG gas cylinder is connected with the gas inlet end of the LNG engine;
the seawater pump is connected with the closed circulating heat exchanger, and high-temperature cooling water of the LNG engine enters the closed circulating heat exchanger through a closed circulating cooling water pipeline V to exchange heat with low-temperature seawater and then flows back to the LNG engine; the low-temperature seawater becomes high-temperature cooling water after heat exchange, part of the high-temperature cooling water enters the tube bundle heat exchanger through a pipeline II, and under the action of the high-temperature cooling water, liquefied natural gas in the LNG gas cylinder absorbs heat through the tube bundle heat exchanger, is converted into gaseous natural gas from constant pressure and is compressed and stored in a CNG gas cylinder, and is conveyed to the LNG engine through a pipeline I;
the tube bundle type heat exchanger, the heat dissipation coil and the low-temperature cooling water cabinet are sequentially connected, part of high-temperature cooling water is changed into low-temperature cooling water after heat exchange through the tube bundle type heat exchanger, the other part of high-temperature cooling water from the closed circulation heat exchanger is mixed with the low-temperature cooling water and then flows to the heat dissipation coil to dissipate constant heat and maintain the temperature of the cabin constant, and then the low-temperature cooling water flows into the low-temperature cooling water cabinet;
high-temperature waste gas generated by the LNG engine is conveyed to the waste gas heat exchanger through a pipeline III, and high-temperature cooling water from a pipeline II is further heated and then conveyed to the evaporative desalination machine; meanwhile, the seawater pump conveys seawater into an evaporative type desalination machine, and the evaporative type desalination machine is partially vacuumized to reduce the boiling point of the seawater; fresh water generated by the evaporative fresh water generator is stored for ship production and life, and cooling water after heat exchange is conveyed to the low-temperature cooling water tank;
and the outlet of the low-temperature cooling water tank is connected to the LNG engine through a pipeline IV and used for supplementing low-temperature cooling water to the LNG engine.
2. The LNG ship heat energy comprehensive utilization system according to claim 1, wherein a temperature sensor and a screw valve V4 are arranged on an inlet pipeline of the heat dissipation coil, and are controlled in a correlation manner to ensure that the temperature of the mixed low-temperature cooling water is 24-26 ℃.
3. The LNG ship thermal energy comprehensive utilization system according to claim 1, wherein a three-way valve V9 is arranged at the end of the pipeline II, and one outlet of the three-way valve V9 is connected with the inlet of the tube bundle heat exchanger, and the other outlet is connected with the inlet of the waste gas heat exchanger.
4. The LNG ship heat energy comprehensive utilization system according to claim 1, wherein a three-way valve V10 is arranged on a pipeline between the tube bundle heat exchanger and the heat dissipation tube plate, one inlet of the three-way valve V10 is connected with a low-temperature cooling water outlet of the tube bundle heat exchanger, and the other inlet is a high-temperature cooling water inlet.
5. The LNG ship heat energy comprehensive utilization system as claimed in claim 1, wherein the pipeline II is provided with a four-way valve V13, one inlet of the four-way valve V13 is connected with the high-temperature cooling water outlet from the pipeline IV, one inlet is connected with the high-temperature cooling water outlet of the closed cycle heat exchanger, one outlet is connected with the inlet of a three-way valve V9, and one outlet is connected with the high-temperature cooling water inlet of the three-way valve V10.
6. The LNG ship heat energy comprehensive utilization system according to claim 1, wherein a three-way valve V12 is arranged behind the seawater pump, an inlet of the three-way valve V12 is connected with the seawater pump, one outlet of the three-way valve V12 is connected with an inlet of the closed cycle heat exchanger, and the other outlet of the three-way valve V12 is connected with an inlet of the evaporative desalination machine.
7. The LNG ship heat energy comprehensive utilization system according to claim 1, wherein a three-way valve V11 is provided at an inlet of the cryogenic cooling water tank; an inlet of the three-way valve V11 is connected with an outlet of the heat dissipation coil, and a flowmeter F1 is arranged between the three-way valve V11 and the heat dissipation coil; the other inlet of the three-way valve V11 is connected with the outlet of the evaporative type desalination machine, and a flow meter F2 is arranged between the three-way valve V11 and the evaporative type desalination machine; the outlet of the three-way valve V11 is connected with the low-temperature cooling water tank.
8. The LNG ship heat energy comprehensive utilization system according to claim 1, wherein a flow meter F3 is provided on the pipeline II.
9. The comprehensive heat energy utilization system for the LNG ships as claimed in claim 1, wherein a safety valve V16 is disposed on the pipeline III for ensuring the safety of the pipeline.
10. The LNG ship thermal energy comprehensive utilization system according to claim 1, wherein the tube bundle heat exchanger is equipped with an electric heating wire for maintaining a high temperature cooling water temperature, and the electric heating wire is put into operation when the high temperature cooling water temperature is not enough to convert LNG in an LNG cylinder to CNG in a CNG cylinder from a constant pressure.
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| CN112815734B (en) * | 2020-12-30 | 2022-09-13 | 大连船舶重工集团有限公司 | Multiple protection system and method for ship vacuum condenser |
| CN113859503A (en) * | 2021-10-28 | 2021-12-31 | 广州文冲船厂有限责任公司 | Adjusting system of ship fresh-water making device |
| CN114590391A (en) * | 2022-03-25 | 2022-06-07 | 广船国际有限公司 | Cargo hold secondary heating system and boats and ships |
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|---|---|---|---|---|
| JP2014171962A (en) * | 2013-03-08 | 2014-09-22 | Sasakura Engineering Co Ltd | Fresh water generator and fresh water generation method |
| CN203824198U (en) * | 2014-02-20 | 2014-09-10 | 武汉三江航天远方科技有限公司 | Marine LNG (Liquefied Natural Gas) cold energy and flue gas waste heat comprehensive utilization system |
| CN104595063B (en) * | 2015-01-28 | 2016-10-12 | 江苏科技大学 | Liquified natural gas gasification system based on double fuel engine of boat and ship cooling water heat |
| CN105697189B (en) * | 2016-03-31 | 2017-05-03 | 山东大学 | System and control method for increasing energy utilization rate of EGR engine |
| 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 |
| CN206954482U (en) * | 2017-07-28 | 2018-02-02 | 浙江海洋大学 | A kind of Central Cooling Water System of LNG fuel ship |
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| CN108975438B (en) * | 2018-07-26 | 2021-07-13 | 江苏科技大学 | LNG regasification and fresh water preparation system and method for LNG power ship |
| CN209053716U (en) * | 2018-09-11 | 2019-07-02 | 广东海洋大学 | A kind of waste heat of LNG Power Vessel and cold energy utilization system |
| CN109812310A (en) * | 2019-04-15 | 2019-05-28 | 哈尔滨工程大学 | A kind of afterheat utilizing system suitable for marine low-speed engine waste heat energy regenerating |
| CN110171553B (en) * | 2019-05-17 | 2021-01-05 | 武汉理工大学 | Comprehensive utilization system for waste heat of hydrogen fuel cell power ship |
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2020
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