CN112693587A - Cargo hold drying system and method for LNG power ship - Google Patents
Cargo hold drying system and method for LNG power ship Download PDFInfo
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- CN112693587A CN112693587A CN202011553772.XA CN202011553772A CN112693587A CN 112693587 A CN112693587 A CN 112693587A CN 202011553772 A CN202011553772 A CN 202011553772A CN 112693587 A CN112693587 A CN 112693587A
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- 238000001035 drying Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003507 refrigerant Substances 0.000 claims abstract description 75
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000009423 ventilation Methods 0.000 claims abstract description 33
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000446 fuel Substances 0.000 claims abstract description 15
- 239000003570 air Substances 0.000 claims description 197
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 13
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 239000012080 ambient air Substances 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims 1
- 238000009834 vaporization Methods 0.000 abstract description 10
- 230000008016 vaporization Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005399 mechanical ventilation Methods 0.000 description 2
- 208000003643 Callosities Diseases 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 206010020649 Hyperkeratosis Diseases 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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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
- B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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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
- B63J2/02—Ventilation; Air-conditioning
- B63J2/08—Ventilation; Air-conditioning of holds
-
- 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
- B63J2/02—Ventilation; Air-conditioning
- B63J2/10—Ventilating-shafts; Air-scoops
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/22—Vaporising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Ocean & Marine Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a cargo hold drying system and method of an LNG power ship, the system mainly comprises: LNG heat transfer system, ethylene glycol solution heat transfer system, cargo hold ventilation drying system. When the cargo hold needs to be dried, the glycol solution is used as a refrigerant, and the cargo hold is cooled and dehumidified by using LNG cold energy, so that the utilization rate of the LNG cold energy can be improved, the consumption of a heat source in the vaporization process of LNG fuel can be reduced, and the reasonable utilization of energy is realized.
Description
Technical Field
The invention belongs to the technical field of ships, and particularly relates to a cargo hold drying system and method for an LNG power ship.
Background
At present, marine transportation is still one of important transportation modes in international trade transportation, and more than two thirds of goods are transported by sea according to statistics. With the rapid development of economy, the demand of marine transportation is increasing continuously, the transportation capacity of grocery ships and bulk cargo ships is large, the grocery ships and bulk cargo ships are widely applied to the aspect of cargo transportation, the types of transported cargos are more and more abundant, such as soybeans, corns, wheat and the like, and some industrial products are also provided, the cargos often need dry space during transportation, are easy to deteriorate under the humid condition, and once the cargos are damaged, huge loss can be caused. It is therefore necessary to ensure that the cargo holds are relatively dry when the vessel is transporting such items.
At present, most of the grocery ships and bulk cargo ships are not provided with drying systems, natural ventilation is usually adopted, the natural ventilation in winter can basically meet the requirement of drying a cargo hold, but the air temperature in summer is high, the air humidity is high, and the requirement of drying the cargo hold cannot be met only by natural ventilation. In addition, the cooling and dehumidifying are also good drying modes, and under the condition that the moisture content of the air is not changed, the water vapor can reach a saturated state through cooling, and the moisture in the air is condensed into water drops and is discharged to the outside. However, cooling air needs separate refrigeration equipment, and the cargo hold is large, so that the power consumption of the system is additionally increased, and the load of a ship power grid is greatly increased, which is contrary to the trend of energy conservation and emission reduction of ships.
The LNG powered ship is called an "LNG powered ship" and includes various types such as a grocery ship and a bulk cargo ship, which have large carrying capacity and thus relatively high power consumption, and the LNG fuel releases much cold energy during vaporization, and when the ship is underway, the LNG cold energy is generated at any moment, and if the cold energy is used for cooling and dehumidifying air in the cargo hold to meet the requirement of the cargo in the cargo hold on air humidity, the method has greater practical application significance.
Disclosure of Invention
The present invention is directed to a cargo hold drying system and method for an LNG-powered ship.
The first purpose of the invention is to provide a cargo hold drying system of an LNG power ship, which comprises an LNG heat exchange system, a glycol solution heat exchange system and a cargo hold ventilation drying system.
Wherein LNG heat transfer system includes: booster pump, LNG heat exchanger, heating circulation pump, cylinder liner water heater.
The glycol solution heat exchange system comprises: the system comprises a glycol heat exchanger, a drying circulating pump, a fan, a cargo compartment air cooler, a water condensation cabinet and a discharge valve.
The cargo compartment aeration drying system comprises: the device comprises an exhaust valve, an air return valve, an air inlet valve, an outside air dew point meter, an outside air humidity meter, a cargo compartment air inlet, a cargo compartment air outlet, a cargo compartment air dew point meter, a cargo compartment air humidity meter, an air inlet pipeline, an air return pipeline and a cargo compartment.
In the LNG heat exchange system, the booster pump is connected with the LNG heat exchanger through a pipeline, the LNG heat exchanger is connected with the cylinder sleeve water heater through a pipeline, the heating circulating pump is connected with the LNG heat exchanger through a pipeline, and the glycol solution with higher concentration circulates in the LNG heat exchange system as a refrigerant A. Cylinder liner water heater heats refrigerant A, refrigerant A circulates under the effect of heating cycle pump, LNG fuel is refuted out from the LNG fuel jar, reach certain pressure through the booster pump, flow through the LNG heat exchanger, carry out the heat transfer with refrigerant A, refrigerant A absorbs the cold energy from LNG, refrigerant A flows through cylinder liner water heater and heats once more, so circulation, and the LNG fuel via the LNG heat exchanger is vaporized and is reached the required temperature of boats and ships main power equipment, send to the boats and ships host computer and use.
In the glycol solution heat exchange system, the drying circulating pump is connected with the glycol heat exchanger through a pipeline, the cargo compartment air cooler is connected with the water condensation cabinet through a pipeline, a pipeline is arranged below the water condensation cabinet, a discharge valve is arranged on the pipeline, and the glycol solution with lower concentration is used as a refrigerant B. The refrigerant B and the refrigerant A exchange heat through the glycol heat exchanger, the refrigerant B absorbs cold energy carried by the refrigerant A, and the refrigerant B enters the cargo space air cooler under the action of the drying circulating pump.
In cargo hold ventilation drying system, be equipped with cargo hold air intake, cargo hold air outlet, cargo hold air dew point hygrometer, cargo hold air humidity appearance in the cargo hold, intake stack department is equipped with outside air dew point hygrometer, outside air humidity appearance, be equipped with the exhaust valve on the return air duct, be equipped with the air inlet valve on the intake stack, intake stack and return air duct intercommunication department are equipped with the return air valve.
A second object of the present invention is to provide a method for drying a cargo hold of an LNG-powered ship, based on the above-mentioned cargo hold drying system of an LNG-powered ship.
The method provides the following scheme:
the first scheme is as follows: when the dew point temperature of the outside air detected by the outside air dew point instrument is higher than that of the cargo compartment air detected by the cargo compartment air dew point instrument, natural ventilation is not performed at the moment, and the air in the cargo compartment is cooled and dehumidified only by using the LNG cold energy.
In the LNG heat exchange system, a cylinder liner water heater heats a refrigerant A, the refrigerant A circulates under the action of a heating circulating pump, LNG fuel is unloaded from an LNG fuel tank, reaches a certain pressure through a booster pump, flows through an LNG heat exchanger, exchanges heat with the refrigerant A, absorbs cold energy from LNG, and then the refrigerant A flows through the cylinder liner water heater to be heated again, so that the refrigerant A is prevented from being frozen due to too low temperature, and a heat source required by LNG vaporization is provided; in the glycol solution heat exchange system, a refrigerant B absorbs cold energy carried by a refrigerant A and enters a cargo compartment air cooler along a pipeline under the action of a drying circulating pump, at the moment, a fan blows the cargo compartment air cooler to reduce the temperature around the cargo compartment air cooler, so that the dew point temperature of the ambient air is reached, water vapor is condensed, condensed water is collected in a condensed water cabinet firstly, at the moment, a discharge valve is opened, and the condensed water is discharged to the outside of a ship through the pipeline, so that the air humidity is reduced, and the purpose of drying the cargo compartment is achieved; at the moment, in the cargo compartment ventilation drying system, the exhaust valve and the intake valve are closed, the return valve is opened, and the cargo compartment is not ventilated with the outside any more.
Scheme II: when the dew point temperature of the outside air detected by the outside air dew point meter is lower than the dew point temperature of the cargo compartment air detected by the cargo compartment air dew point meter, if the outside air humidity detected by the outside air humidity meter is higher than the humidity of the cargo compartment air detected by the cargo compartment air humidity meter, the cargo compartment is dried and ventilated.
At the moment, in the LNG heat exchange system, a cylinder liner water heater heats a refrigerant A, the refrigerant A circulates under the action of a heating circulating pump, LNG fuel is unloaded from an LNG fuel tank, reaches a certain pressure through a booster pump, flows through an LNG heat exchanger, exchanges heat with the refrigerant A, absorbs cold energy from LNG, and then the refrigerant A flows through the cylinder liner water heater to be heated again, so that the refrigerant A is prevented from being frozen due to too low temperature, and a heat source required by LNG vaporization is provided; in the glycol solution heat exchange system, a refrigerant B absorbs cold energy carried by a refrigerant A and enters a cargo compartment air cooler along a pipeline under the action of a drying circulating pump, at the moment, a fan blows the cargo compartment air cooler to reduce the temperature around a cargo compartment air cooler 8 so as to reach the dew point temperature of ambient air and enable water vapor to form dew, condensed water is collected in a condensation cabinet firstly, at the moment, a discharge valve is opened, and the condensed water is discharged to the outside of a ship through the pipeline so as to reduce the air humidity; in the cargo compartment ventilation and drying system, an exhaust valve and an air inlet valve are opened, an air return valve is closed, outside air enters the cargo compartment from an air inlet pipeline through a cargo compartment air inlet, and meanwhile, air in the cargo compartment is exhausted to the atmosphere from the air return pipeline through a cargo compartment air outlet.
The third scheme is as follows: when the dew point temperature of the outside air detected by the outside air dew point instrument is lower than the dew point temperature of the cargo compartment air detected by the cargo compartment air dew point instrument, if the outside air temperature and the humidity both meet the requirement of cargo compartment drying, natural ventilation can be carried out on the cargo compartment only.
At the moment, in the LNG heat exchange system, the cylinder liner water heater heats the refrigerant A, the refrigerant A absorbs cold energy from LNG, then the refrigerant A flows through the cylinder liner water heater to be heated again, the refrigerant B is prevented from freezing and provides a heat source required by LNG vaporization, meanwhile, the drying circulating pump is turned off, the refrigerant B and the refrigerant A do not exchange heat any more, at the moment, outside air enters the cargo hold from one side of the cargo hold cover and is discharged from the other side of the cargo hold cover, and the purpose of natural ventilation is achieved.
And the scheme is as follows: under special conditions, such as when a ship is berthed and checked, workers need to enter the cargo compartment, under the condition of not considering the humidity and the temperature of the cargo compartment, the cargo compartment needs to be ventilated in order to meet the requirement of the oxygen content in the cargo compartment, but the requirement cannot be met quickly only by natural ventilation, a mechanical ventilation mode can be adopted, the return air valve is closed, the air inlet valve and the exhaust air valve are opened, under the action of the fan, outside air enters the cargo compartment from the air inlet pipeline through the air inlet of the cargo compartment, and the air in the cargo compartment is exhausted from the air outlet of the cargo compartment through the air return pipeline, so that the quick ventilation of the cargo compartment is realized.
The invention has the advantages that:
1. the system of the invention utilizes the LNG cold energy to cool and dehumidify the air of the ship cargo hold, thereby achieving the purpose of drying the cargo hold, fully utilizing the cold energy of the LNG fuel, reducing the consumption of a heat source in the vaporization process of the LNG fuel and realizing the reasonable utilization of energy.
2. The system can realize ventilation rapidly when the cargo hold needs enough oxygen, and solves the problem of low efficiency of the traditional natural ventilation.
3. The system has simple structure, convenient installation and easy realization, does not need to install expensive dehumidification equipment, and has low investment cost and operation cost.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic view of an internal circulation of the cargo compartment;
FIG. 3 is a schematic view of the aeration drying of the cargo hold;
figure 4 is a schematic view of the natural ventilation of the cargo hold.
In the drawings: 1. a booster pump; an LNG heat exchanger; 3. heating the circulating pump; 4. a cylinder liner water heater; 5. a glycol heat exchanger; 6. drying the circulating pump; 7. a fan; 8. a cargo space air cooler; 9. a water condensing cabinet; 10. a relief valve; 11. an exhaust valve; 12. a return air valve; 13. an air inlet valve; 14. an outside air dew point meter; 15. an outside air humidity meter; 16. an air inlet of the cargo hold; 17. an air outlet of the cargo compartment; 18. a cargo compartment air dew point meter; 19. a cargo compartment air humidity gauge; 20. an air inlet pipeline; 21. a return air duct; 22. the cargo hold.
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 examples.
A cargo hold drying system of an LNG power ship mainly comprises an LNG heat exchange system, an ethylene glycol solution heat exchange system and a cargo hold ventilation drying system. As shown in fig. 1, 2 and 3.
Wherein LNG heat transfer system includes: booster pump 1, LNG heat exchanger 2, heating circulation pump 3, cylinder liner water heater 4.
The glycol solution heat exchange system comprises: the system comprises a glycol heat exchanger 5, a drying circulating pump 6, a fan 7, a cargo compartment air cooler 8, a water condensing cabinet 9 and a discharge valve 10.
The cargo compartment aeration drying system comprises: an exhaust valve 11, an air return valve 12, an air inlet valve 13, an outside air dew point instrument 14, an outside air humidity instrument 15, a cargo compartment air inlet 16, a cargo compartment air outlet 17, a cargo compartment air dew point instrument 18, a cargo compartment air humidity instrument 19, an air inlet pipeline 20, an air return pipeline 21 and a cargo compartment 22.
In the LNG heat exchange system, the booster pump 1 is connected with the LNG heat exchanger 2 through a pipeline, the LNG heat exchanger 2 is connected with the cylinder liner water heater 4 through a pipeline, the heating circulating pump 3 is connected with the LNG heat exchanger 2 through a pipeline, and the ethylene glycol solution with higher concentration circulates in the LNG heat exchange system as a refrigerant A. Refrigerant A flows through cylinder liner water heater 4, cylinder liner water heater 4 heats refrigerant A, refrigerant A circulates under the effect of heating circulating pump 3, LNG fuel is refuted out from the LNG fuel jar, reach certain pressure through booster pump 1, flow through LNG heat exchanger 2, exchange heat with refrigerant A, refrigerant A absorbs the cold energy from LNG, refrigerant A flows through cylinder liner water heater 4 and heats once more, prevent that refrigerant A temperature is too low and freeze, and provide the required heat source of LNG vaporization, so circulation, LNG fuel is vaporized and reaches the required temperature of boats and ships main power equipment, send to the burning of boats and ships host computer.
In the glycol solution heat exchange system, the drying circulating pump 6 is connected with the glycol heat exchanger 5 through a pipeline, the area of dotted lines in fig. 1 is a cargo compartment heat exchange device which is arranged in a cargo compartment 22 and comprises a fan 7, a condensate tank 9 and a cargo compartment air cooler 8, because the ship is provided with a plurality of cargo compartments 22, a plurality of such heat exchange devices are provided, as illustrated by taking a cargo compartment number 1 as an example, the cargo compartment air cooler 8 is connected with the condensate tank 9 through a pipeline, a pipeline is arranged below the condensate tank 9 and is provided with a discharge valve 10, wherein glycol solution with lower concentration is taken as a refrigerant B, the refrigerant B and the refrigerant A exchange heat through the glycol heat exchanger 5, the refrigerant B absorbs cold energy carried by the refrigerant A, the refrigerant B enters the cargo compartment air cooler 8 under the action of the drying circulating pump 6, the fan 7 blows air to the cargo compartment air cooler 8, so that the temperature around the cargo compartment air cooler 8 is reduced, thereby achieving the dew point temperature of the ambient air, causing the water vapor to condense, reducing the air humidity, and achieving the purpose of drying the cargo compartment 22.
In cargo hold ventilation drying system, be equipped with cargo hold air intake 16, cargo hold air outlet 17, cargo hold air dew point appearance 18, cargo hold air humidity appearance 19 in the cargo hold 22, intake stack 20 department is equipped with external air dew point appearance 14, external air humidity appearance 15, be equipped with exhaust valve 11 on the return air duct 21, be equipped with inlet valve 13 on the intake stack 20, intake stack 20 and return air duct 21 intercommunication department are equipped with return air valve 12.
The invention provides the following scheme:
the first scheme is as follows: when the dew point temperature of the outside air detected by the outside air dew point meter 14 is higher than the dew point temperature of the cargo compartment air detected by the cargo compartment air dew point meter 18, natural ventilation is not performed any more, and the air in the cargo compartment is cooled and dehumidified only by using the LNG cold energy.
In the LNG heat exchange system, a cylinder liner water heater 4 heats a refrigerant A, the refrigerant A circulates under the action of a heating circulating pump 3, LNG fuel is transported out of an LNG fuel tank, reaches a certain pressure through a booster pump 1, flows through an LNG heat exchanger 2, exchanges heat with the refrigerant A, absorbs cold energy from LNG, and then the refrigerant A flows through the cylinder liner water heater 4 to be heated again, so that the refrigerant A is prevented from being frozen due to too low temperature, and a heat source required by LNG vaporization is provided; in the glycol solution heat exchange system, the refrigerant B absorbs cold energy carried by the refrigerant A and enters a cargo compartment air cooler 8 along a pipeline under the action of a drying circulating pump 6, at the moment, a fan 7 blows the cargo compartment air cooler 8 to reduce the ambient temperature of the cargo compartment air cooler 8, so that the dew point temperature of ambient air is reached, water vapor is condensed, condensed water is firstly collected in a condensation water cabinet 9, at the moment, a discharge valve 10 is opened, and the condensed water is discharged to the outside of a ship through the pipeline, so that the air humidity is reduced, and the purpose of drying the cargo compartment is achieved; in the cargo compartment ventilation and drying system, the exhaust valve 11 and the intake valve 13 are closed, and the return valve 12 is opened, so that the cargo compartment is not ventilated with the outside any more, as shown in fig. 2.
Scheme II: when the dew point temperature of the outside air detected by the outside air dew point meter 14 is lower than the dew point temperature of the cargo compartment air detected by the cargo compartment air dew point meter 18, the cargo compartment 22 is dry-ventilated if the outside air humidity detected by the outside air humidity meter 15 is higher than the humidity of the cargo compartment air detected by the cargo compartment air humidity meter 19.
At this time, in the LNG heat exchange system, the cylinder liner water heater 4 heats the refrigerant a, the refrigerant a circulates under the action of the heating circulating pump 3, the LNG fuel is unloaded from the LNG fuel tank, reaches a certain pressure through the booster pump 1, flows through the LNG heat exchanger 2, exchanges heat with the refrigerant a, the refrigerant a absorbs cold energy from the LNG, and then the refrigerant a flows through the cylinder liner water heater 4 to be heated again, so that the refrigerant a is prevented from freezing due to too low temperature, and a heat source required by vaporization of the LNG is provided; in the glycol solution heat exchange system, the refrigerant B absorbs cold energy carried by the refrigerant A and enters a cargo compartment air cooler 8 along a pipeline under the action of a drying circulating pump 6, at the moment, a fan 7 blows the cargo compartment air cooler 8 to reduce the ambient temperature of the cargo compartment air cooler 8 so as to reach the dew point temperature of ambient air, so that water vapor is condensed, condensed water is firstly collected in a condensation cabinet 9, at the moment, a discharge valve 10 is opened, and the condensed water is discharged to the outside of a ship through the pipeline so as to reduce the air humidity; in the cargo compartment ventilating and drying system, the exhaust air valve 11 and the intake air valve 13 are opened, and the return air valve 12 is closed, as shown in fig. 3, and outside air is introduced into the cargo compartment 22 from the intake duct 20 through the cargo compartment intake port 16 via the intake air valve 13, and at the same time, air in the cargo compartment 22 is discharged to the atmosphere from the return air duct 21 through the exhaust air valve 11 via the cargo compartment outlet port 17.
The third scheme is as follows: when the dew point temperature of the outside air detected by the outside air dew point meter 14 is lower than the dew point temperature of the cargo compartment air detected by the cargo compartment air dew point meter 18, only the cargo compartment may be naturally ventilated if both the outside air temperature and the humidity satisfy the requirement for the dryness of the cargo compartment.
At this time, the drying circulation pump 6 is turned off, so that the electric energy consumed by the operation of the drying circulation pump can be saved, the refrigerant B and the refrigerant A do not exchange heat any more, in the LNG heat exchange system, the cylinder liner water heater 4 heats the refrigerant A, the refrigerant A absorbs cold energy from LNG, then the refrigerant A flows through the cylinder liner water heater 4 to be heated again, at this time, the cylinder liner water flowing through the cylinder liner water heater 4 should increase the flow rate to prevent the refrigerant A from freezing and provide enough heat source for vaporization of LNG, FIG. 4 is a schematic diagram of natural ventilation, a natural ventilation inlet and a natural ventilation outlet are respectively arranged at two sides of a cabin cover, when natural ventilation is performed, a natural ventilation inlet and a natural ventilation outlet are opened, the left and the right of the drawing do not represent the left and the right of a ship board, FIG. 4 can be regarded as a schematic diagram obtained by looking from the ship bow to the stern, and can be regarded as only representing that the natural ventilation inlet and the natural, at the moment, the outside air enters the cargo hold from one side of the hatch cover and is exhausted from the other side of the hatch cover, and the purpose of natural ventilation is achieved.
And the scheme is as follows: in special situations, such as when a ship is berthed for inspection, workers need to enter the cargo compartment 22, and in order to meet the requirement of the oxygen content in the cargo compartment 22 without considering the humidity and the temperature of the cargo compartment 22, the cargo compartment 22 needs to be ventilated, but only natural ventilation cannot meet the requirement quickly, the requirement can be met in a mechanical ventilation mode, at the moment, the air return valve 12 is closed, the air inlet valve 13 and the exhaust valve 11 are opened, under the action of the fan 7, outside air enters the cargo compartment 22 from the air inlet pipeline 20 through the cargo compartment air inlet 16 through the air inlet valve 13, air in the cargo compartment 22 is exhausted to the atmosphere from the air return pipeline 21 through the exhaust valve 11 through the cargo compartment air outlet 17, and therefore the cargo compartment 22 can be ventilated quickly, and the requirement of the oxygen concentration in the cargo compartment 22 can be met as soon.
The foregoing is merely a preferred embodiment of the present invention and the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting. It should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a cargo hold drying system of LNG power ship which characterized in that: the system comprises an LNG heat exchange system, an ethylene glycol solution heat exchange system and a cargo compartment ventilation drying system;
wherein LNG heat transfer system includes: a booster pump (1), an LNG heat exchanger (2), a heating circulating pump (3) and a cylinder liner water heater (4);
the glycol solution heat exchange system comprises: the system comprises a glycol heat exchanger (5), a drying circulating pump (6), a fan (7), a cargo compartment air cooler (8), a condensate tank (9) and a discharge valve (10);
the cargo compartment aeration drying system comprises: the air-conditioning system comprises an exhaust valve (11), an air return valve (12), an air inlet valve (13), an external air dew point instrument (14), an external air humidity instrument (15), a cargo compartment air inlet (16), a cargo compartment air outlet (17), a cargo compartment air dew point instrument (18), a cargo compartment air humidity instrument (19), an air inlet pipeline (20), an air return pipeline (21) and a cargo compartment (22), wherein the cargo compartment air inlet (16), the cargo compartment air outlet (17), the cargo compartment air dew point instrument (18) and the cargo compartment air humidity instrument (19) are arranged in the cargo compartment (22).
2. A cargo tank drying system for an LNG-powered ship as claimed in claim 1, wherein: in cargo compartment ventilation system, intake duct (20) department is equipped with outside air dew point hygrometer (14), outside air humidity appearance (15), be equipped with exhaust valve (11) on return air duct (21), be equipped with intake valve (13) on intake duct (20), intake duct (20) and return air duct (21) intercommunication department are equipped with return air valve (12).
3. A cargo tank drying system for an LNG-powered ship as claimed in claim 1, wherein: the drying circulating pump (6) is connected with the glycol heat exchanger (5) through a pipeline.
4. A cargo tank drying system for an LNG-powered ship as claimed in claim 1, wherein: the cargo compartment air cooler (8) is connected with the water condensation cabinet (9) through a pipeline, a pipeline is arranged below the water condensation cabinet (9), and a discharge valve (10) is arranged on the pipeline.
5. A cargo tank drying system for an LNG-powered ship as claimed in claim 1, wherein: in the LNG heat exchange system, the booster pump (1) is connected with the LNG heat exchanger (2) through a pipeline, the LNG heat exchanger (2) is connected with the cylinder sleeve water heater (4) through a pipeline, and the heating circulating pump (3) is connected with the LNG heat exchanger (2) through a pipeline.
6. A method of drying a cargo hold of an LNG-powered ship using the system of claim 1, characterized by: when the dew point temperature of the outside air detected by an outside air dew point instrument (14) is lower than the dew point temperature of the cargo compartment air detected by a cargo compartment air dew point instrument (18), but the outside air humidity detected by an outside air humidity instrument (15) is higher than the air humidity in the cargo compartment detected by a cargo compartment air humidity instrument (19), drying and ventilation are carried out on a cargo compartment (22), at the moment, in an LNG heat exchange system, a cylinder sleeve water heater (4) heats a refrigerant (1), the refrigerant (1) circulates under the action of a heating circulating pump (3), LNG fuel flows through an LNG heat exchanger (2) to exchange heat with the refrigerant (1), the refrigerant (1) absorbs the cold energy from LNG, then the refrigerant (1) flows through the cylinder sleeve water heater (4) to be heated again, in an ethylene glycol solution heat exchange system, the refrigerant (2) absorbs the cold energy carried by the refrigerant (1) and enters a cargo compartment air cooler (8) along a pipeline under, at the moment, the fan (7) blows air to the cargo compartment air cooler (8), so that the ambient temperature of the cargo compartment air cooler (8) is reduced, the dew point temperature of ambient air is reached, water vapor is condensed, and the air humidity is reduced, in the cargo compartment ventilation and drying system, the exhaust valve (11) and the intake valve (13) are opened, the return air valve (12) is closed, external air enters the cargo compartment (22) from the intake pipeline (20) through the intake valve (13) through the cargo compartment air inlet (16), and meanwhile, the air in the cargo compartment (22) is exhausted to the atmosphere from the return air pipeline (21) through the exhaust valve (11) through the cargo compartment air outlet (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553772.XA CN112693587A (en) | 2020-12-24 | 2020-12-24 | Cargo hold drying system and method for LNG power ship |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011553772.XA CN112693587A (en) | 2020-12-24 | 2020-12-24 | Cargo hold drying system and method for LNG power ship |
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| CN112693587A true CN112693587A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011553772.XA Pending CN112693587A (en) | 2020-12-24 | 2020-12-24 | Cargo hold drying system and method for LNG power ship |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113636059A (en) * | 2021-09-03 | 2021-11-12 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Single dehumidifier double or multiple cargo compartment dehumidification system |
| CN113650972A (en) * | 2021-08-31 | 2021-11-16 | 郑州轻工业大学 | Passive self-help refrigerated container and control method thereof |
| CN113859507A (en) * | 2021-08-31 | 2021-12-31 | 广州文冲船舶修造有限公司 | Rust-resistant dehumidification system in cabin |
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| GB501269A (en) * | 1936-05-23 | 1939-02-20 | Mark Ralph Colby | Method of and apparatus for preventing damage to cargo in cargo compartments |
| CN211336398U (en) * | 2019-12-27 | 2020-08-25 | 青岛科技大学 | System for refrigerated container utilizes boats and ships LNG cold energy |
| CN214296413U (en) * | 2020-12-24 | 2021-09-28 | 山东海运股份有限公司 | Cargo hold drying system of LNG power ship |
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| GB501269A (en) * | 1936-05-23 | 1939-02-20 | Mark Ralph Colby | Method of and apparatus for preventing damage to cargo in cargo compartments |
| CN211336398U (en) * | 2019-12-27 | 2020-08-25 | 青岛科技大学 | System for refrigerated container utilizes boats and ships LNG cold energy |
| CN214296413U (en) * | 2020-12-24 | 2021-09-28 | 山东海运股份有限公司 | Cargo hold drying system of LNG power ship |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113650972A (en) * | 2021-08-31 | 2021-11-16 | 郑州轻工业大学 | Passive self-help refrigerated container and control method thereof |
| CN113859507A (en) * | 2021-08-31 | 2021-12-31 | 广州文冲船舶修造有限公司 | Rust-resistant dehumidification system in cabin |
| CN113650972B (en) * | 2021-08-31 | 2022-08-12 | 郑州轻工业大学 | Passive self-help refrigerated container and control method thereof |
| CN113859507B (en) * | 2021-08-31 | 2022-11-08 | 广州文冲船舶修造有限公司 | Rust-resistant dehumidification system in cabin |
| CN113636059A (en) * | 2021-09-03 | 2021-11-12 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Single dehumidifier double or multiple cargo compartment dehumidification system |
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