CN113697083A - LNG power CO2Cargo hold heat preservation system of transport ship by using cold energy of fuel - Google Patents
LNG power CO2Cargo hold heat preservation system of transport ship by using cold energy of fuel Download PDFInfo
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- CN113697083A CN113697083A CN202111162451.1A CN202111162451A CN113697083A CN 113697083 A CN113697083 A CN 113697083A CN 202111162451 A CN202111162451 A CN 202111162451A CN 113697083 A CN113697083 A CN 113697083A
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- storage tank
- refrigerant
- lng
- ship
- heat exchanger
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- 239000000446 fuel Substances 0.000 title claims abstract description 37
- 238000004321 preservation Methods 0.000 title claims description 9
- 239000003507 refrigerant Substances 0.000 claims abstract description 69
- 238000005057 refrigeration Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 4
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 95
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 54
- 239000003949 liquefied natural gas Substances 0.000 description 43
- 239000001569 carbon dioxide Substances 0.000 description 27
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides LNG power CO2The cargo hold heat insulating system for transport ship with cold fuel energy includes LNG tank, lightering pump, booster pump, refrigerant heat exchanger, cylinder water heater, CO2Heat exchanger, refrigerant circulating pump, and CO2Storage tank, refrigerant thermal bulb and temperature relay are applied to semi-cold semi-pressure CO using LNG as power2The transport vessel is provided with a ship. The system provided by the invention utilizes cold energy released in the using process of LNG fuel as CO2CO of transport ship2Storage tank refrigeration to avoid CO2The BOG is generated in the storage tank, and the ship does not need to additionally arrange new CO2The storage tank refrigeration equipment can save a large amount of ship electric energy and investment cost, improve the economy of the ship, effectively save the main engine cylinder liner water containing high-quality waste heat, and improve the energy utilization rate of the whole ship. Therefore, under the background of energy conservation and emission reduction of the current ship, the invention has good performanceAnd the application prospect is good.
Description
Technical Field
The invention belongs to the technical field of ships, and particularly relates to LNG (liquefied natural gas) power CO2Utilization of transport shipA heat preservation system of a cargo hold of fuel cold energy.
Background
Global warming is one of the environmental issues that are currently of great concern to international society. In recent years, carbon dioxide (CO) has been used2) The continuous increase of gas emission, and carbon emission reduction, sequestration and transportation technologies are widely concerned by the ship industry. The international maritime organization puts higher requirements on carbon emission, and China sets an ambitious goal of '2030 year carbon peak reaching and 2060 year carbon neutralization'. How to reduce CO under the background of increasingly severe carbon emission at home and abroad2Has become a difficult problem to solve.
To reduce CO on a large scale2Emission, possibly to CO2Trapped and utilized or stored. At present, CO is commonly used2The storage method mainly comprises ore carbonization, seawater carbon fixation, mine sealing and the like. For example, the storage capacity of an iceland is 2.5 trillion tons of CO2Over 55 years of global CO2And (4) discharging the amount. However, in any storage mode, CO is required2For offshore transfer and transportation, CO2Transport ship is exactly transporting CO2Is one of the important means of.
For increasing CO2Transport volume of, CO2CO is usually transported in liquid form using storage tanks2The storage tank of the transport ship has full-cooling type, full-pressure type and semi-cooling and semi-pressure type. The major disadvantages of the fully-cooled and fully-pressurized storage tanks are that the full pressure type adopts a high-pressure mode to supply CO2Liquefaction, the pressure requirement on a storage tank is high; the full cooling type needs to reduce the temperature in the storage tank to about minus 79 ℃, and needs high-cost refrigeration equipment and a thick storage tank heat-insulating layer. While semi-cold semi-pressure CO2The pressure in the storage tank is between 1.0MPa and 1.5MPa, the temperature is maintained between-36.61 ℃ and-25.74 ℃, the temperature and pressure of the required storage tank are relatively low, the economic efficiency is better, but a certain temperature difference still exists between the storage tank and the external environment, so that more heat is permeated in the storage tank, and liquid CO in the storage tank is inevitably generated2BOG is generated, and for this reason, a refrigeration device needs to be arranged on a ship, but the refrigeration device needs to be powered by a ship power system, and a large amount of ship electric energy is consumed.
The natural gas is a clean and environment-friendly high-quality energy source and is abundant in global reserves, and compared with fossil fuels such as petroleum and the like, the natural gas used as the marine energy source can avoid SOxCan also greatly reduce NOxAnd CO2And thus, current and future LNG powered ships will be increasing. Furthermore, due to the low density of natural gas, natural gas is often liquefied and stored in tanks in order to meet fuel carrying requirements and further reduce storage space. LNG (liquefied natural gas) is low-temperature liquid at the temperature of 163 ℃ below zero, and when the LNG is used as fuel, the LNG needs to be gasified by heat absorption and heated to the temperature of 20 ℃ to 45 ℃ for use, and a large amount of cold energy is released in the process.
Based on the method, an LNG power CO can be provided2Cargo hold heat preservation system of transport ship by using cold energy of fuel, and cold energy of LNG fuel is CO2CO of transport ship2The tank is refrigerated to keep it at a relatively low temperature, thereby avoiding CO2The BOG is generated in the storage tank, so that the method can greatly reduce the consumption of the electric energy of the ship and has high practical significance.
Disclosure of Invention
The invention aims to solve the problems mentioned above and provide an LNG power CO2The transportation ship utilizes the heat preservation system of the cargo hold of the cold energy of fuel. The system comprises an LNG fuel supply system, CO2A storage tank refrigeration system.
Wherein the LNG fuel supply system includes: LNG storage tank, lightering pump, booster pump, refrigerant heat exchanger, cylinder liner water heater.
The CO is2The storage tank refrigeration system includes: refrigerant heat exchanger, CO2Heat exchanger, refrigerant circulating pump, and CO2Storage tank, refrigerant temperature package, temperature relay.
In the LNG fuel supply system, be equipped with the lightering pump in the LNG storage tank, the lightering pump passes through pipe connection with the booster pump, the booster pump passes through pipe connection with the refrigerant heat exchanger, cylinder liner water heater passes through pipe connection with the refrigerant heat exchanger, and final pipeline accesss to the boats and ships host computer.
In CO2Storage tank refrigerationIn the system, the refrigerant heat exchanger and CO2The heat exchangers are connected by a pipeline, CO2The heat exchanger is connected with the refrigerant circulating pump through a pipeline, and CO2The heat exchanger is arranged at the CO2In the storage tank, the refrigerant thermal bulb is arranged on the refrigerant passing through CO2And the temperature relay is electrically connected with the refrigerant temperature bulb and the refrigerant circulating pump on the main pipeline after heat exchange of the heat exchanger.
When the ship sails, in the LNG fuel supply system, fuel in the LNG storage tank is output to the booster pump through the lightering pump for pressurization, the pressurized LNG fuel enters the refrigerant heat exchanger for heat exchange, and is gasified through the cylinder liner water heater and conveyed to the ship main engine for combustion after reaching the temperature requirement.
In CO2In the storage tank refrigerating system, the refrigerant absorbs the cold energy in the LNG fuel in the refrigerant heat exchanger, and the refrigerant is in the CO under the action of the refrigerant circulating pump2The refrigerant carries cold energy to enter CO through circulation in the storage tank refrigeration system2CO in storage tank2Heat exchanger for transferring cold energy to liquid CO2Is CO2And (5) refrigerating the storage tank.
The CO is2A control system is arranged in the storage tank refrigerating system, and the refrigerant passes through CO2The heat exchanger is CO2The storage tank transmits cold energy, a refrigerant thermal bulb is arranged on a main pipeline after the refrigerants are intersected, the refrigerant thermal bulb transmits collected temperature information to the temperature relay, and when the temperature relay detects that CO is collected from the temperature relay2When the temperature of the refrigerant discharged from the storage tank reaches a set lower limit value, the refrigerant circulating pump stops working, and CO is discharged2The storage tank refrigeration system is stopped; when higher than the set upper limit value, CO2The storage tank refrigeration system restarts to work so as to realize the utilization of LNG cold energy into CO2CO on transport vessel2The storage tank is insulated, and BOG is avoided.
Further, to increase CO2The convection heat exchange effect in the storage tank is positive floating in the ship and CO2When the filling rate of the storage tank is 95%, CO2The heat exchanger is arranged at a position 1m below the free liquid level in the storage tank.
The invention has the beneficial effects that:
1. the system is applied to semi-cold semi-pressure CO using LNG as power2On the transport ship, cold energy released in the process of using LNG fuel is skillfully utilized as CO2The storage tank is used for refrigeration, and the ship does not need to be additionally provided with CO2Storage tank refrigeration equipment, and the invention can avoid CO2BOG is generated in the cargo hold, so that the consumption of ship electric energy is reduced, and the cargo hold has good economical efficiency.
2. The system of the invention first utilizes CO2The energy in the storage tank heats the LNG fuel, and then the cylinder sleeve is adopted to heat water to reach the air inlet temperature of the main engine, so that the main engine cylinder sleeve water containing high-quality waste heat can be effectively saved, and the energy utilization rate of the whole ship is improved.
3. The system has simple structure, lower cost and easy realization, and can avoid the great waste of cold energy of LNG fuel and save CO for ships under the background of energy conservation and emission reduction2The storage tank requires electric energy for refrigeration, high-quality waste heat of cylinder liner water of the marine main engine is reduced, and the invention has good application prospect under the background of the current marine green environmental protection suggestion.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is LNG storage tank and CO2A schematic view of the installation position of the storage tank on the ship;
in the drawings: an LNG storage tank; 2. a lightering pump; 3. a booster pump; 4. a refrigerant heat exchanger; 5. a cylinder liner water heater; CO 62A heat exchanger; 7. a refrigerant circulating pump; CO 82A storage tank; 9. a refrigerant thermal bulb; 10. a temperature relay.
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.
LNG power CO2Cargo hold thermal insulation system for transport ship using cold energy of fuel, as shown in fig. 1, comprising LNG fuel supply system and CO2A storage tank refrigeration system. Wherein, LNG fuel supply system includes: LNG storage tank 1, lightering pump 2, booster pump 3, refrigerant heat exchanger 4, cylinder liner water heater 5. CO 22The storage tank refrigeration system includes: refrigerant heat exchanger 4, CO2Heat exchanger 6, refrigerant circulating pump 7, CO2 A storage tank 8, a refrigerant thermal bulb 9 and a temperature relay 10.
As shown in figure 1, the system of the invention is applied to LNG-powered semi-cold semi-pressure CO2On transport ships, due to CO2The deck space of the carrier is sufficient, so the LNG storage tank 1 is disposed on the deck in front of the stern of the ship. In the LNG fuel supply system, a transfer pump 2 is arranged in an LNG storage tank 1 and is used for transferring the LNG fuel out of the LNG storage tank 1, the transfer pump 2, a booster pump 3, a refrigerant heat exchanger 4 and a cylinder liner water heater 5 are sequentially connected through pipelines, and finally the pipelines are led to a ship main engine; in CO2In the storage tank refrigerating system, the refrigerant heat exchanger 4 and CO2The heat exchanger 6 and the refrigerant circulating pump 7 are connected in sequence through a pipeline, and CO is2The heat exchanger 6 is arranged at the CO2In the storage tank 8, refrigerant thermal bulb 9 sets up on the trunk line after the refrigerant heat transfer meets for detect the refrigerant temperature, and temperature relay 10 is connected with refrigerant thermal bulb 9 and refrigerant circulating pump 7.
As shown in FIGS. 1 and 2, the ship is provided with 4 COs2Storage tank 8, therefore 4 CO2The heat exchanger 6 is CO2Tank 8 refrigerated, i.e. CO2Heat exchanger 6 at each CO2Is required in the storage tank 8.
In CO2In the storage tank refrigerating system, the refrigerant in the pipeline can be selected from R170, R22, R1150, R530 and the like to exchange heat with the refrigerant heat exchanger 4 and is CO2The storage tank 8 transfers cold energy. The pipeline for the circulation of the cooling medium in the system is additionally provided with a heat-insulating layer, so that the loss of the cooling energy is reduced.
When the ship sails, in the LNG fuel supply system, fuel in the LNG storage tank 1 is output to the booster pump 3 through the lightering pump 2 to be pressurized, the pressurized LNG fuel enters the refrigerant heat exchanger 4 to exchange heat, and finally is heated by the cylinder liner water heater 5 to be gasified and conveyed to the ship main engine to be combusted.
In CO2In the storage tank refrigerating system, LNG fuel exchanges heat in the refrigerant heat exchanger 4, and the refrigerant exchanges heat in CO under the action of the refrigerant circulating pump 72The refrigerant carries cold energy to enter CO through circulation in the storage tank refrigeration system2In the storage tank 8CO of2A heat exchanger 6 for transferring cold energy to the liquid CO2Is CO2The storage tank 8 is refrigerated to keep the temperature relatively low and avoid CO2BOG production in tank 8.
In CO2A control system is arranged in the storage tank refrigerating system, and the refrigerant passes through CO2The heat exchanger 6 is CO2The storage tank 8 transfers cold energy, a refrigerant thermal bulb 9 is arranged on a main pipeline after the refrigerants are intersected, the refrigerant thermal bulb 9 transfers collected temperature information to the temperature relay 10, and when the temperature relay 10 detects that the temperature information is from CO2When the temperature of the refrigerant discharged from the storage tank is lower than a set lower limit value, the refrigerant circulating pump 7 stops working, and CO is discharged2The tank refrigeration system stops when the temperature relay 10 detects a secondary CO2When the temperature of the refrigerant discharged from the storage tank is higher than a set upper limit value, CO2The storage tank refrigeration system restarts to work so as to realize the utilization of LNG cold energy into CO2CO on transport vessel2The storage tank 8 is insulated to avoid the generation of BOG.
Further, to increase CO2Refrigeration effect in the storage tank 8, positive buoyancy in the ship and CO2When the filling rate of the storage tank 8 is 95%, CO2The heat exchanger 6 is arranged at a position 1m below the free liquid level in the storage tank, so that the refrigerant and the liquid CO in the tank body2The convection heat exchange is better realized.
In conclusion, the system is applied to the semi-cold semi-pressure CO using LNG as power2On the transport ship, cold energy released in the process of using LNG fuel is utilized as CO2Refrigeration, CO avoidance2The generation of BOG in the storage tank 8 can greatly reduce the original CO of the ship2The input cost of the refrigeration equipment of the storage tank 8 and the electric power cost during operation have high practical value.
The above description is only a preferred embodiment of the present invention, but is not limited by the above embodiments, and 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 (4)
1.LNG power CO2Cargo hold heat preservation system that transport ship utilized fuel cold energy, its characterized in that: the system comprises an LNG fuel supply system and CO2A storage tank refrigeration system, a refrigeration system,
the LNG fuel supply system includes: an LNG storage tank (1), a lightering pump (2), a booster pump (3), a refrigerant heat exchanger (4) and a cylinder liner water heater (5),
the CO is2The storage tank refrigeration system includes: refrigerant heat exchanger (4), CO2Heat exchanger (6), refrigerant circulating pump (7), CO2A storage tank (8), a refrigerant thermal bulb (9) and a temperature relay (10),
in CO2In the storage tank refrigerating system, the refrigerant heat exchanger (4) and CO2The heat exchanger (6), the refrigerant thermal bulb (9) and the refrigerant circulating pump (7) are connected in sequence through pipelines, and CO is2The heat exchanger (6) is arranged at the CO2In the storage tank (8).
2. An LNG powered CO according to claim 12Cargo hold heat preservation system that transport ship utilized fuel cold energy, its characterized in that: in the LNG fuel supply system, the lightering pump (2) is arranged in the LNG storage tank (1), and the lightering pump (2), the booster pump (3), the refrigerant heat exchanger (4) and the cylinder liner water heater (5) are sequentially connected through pipelines and finally lead to the ship main engine.
3. An LNG powered CO according to claim 12Cargo hold heat preservation system that transport ship utilized fuel cold energy, its characterized in that: in the ship positive floating state and CO2When the filling rate of the storage tank (8) is 95%, CO2The heat exchanger (6) is arranged at a position 1m below the free liquid level in the storage tank.
4. An LNG powered CO according to claim 12Cargo hold heat preservation system that transport ship utilized fuel cold energy, its characterized in that: the refrigerant thermometer bulb (9), the temperature relay (10) and the refrigerant circulating pump (7) are electrically connected with each other, and the refrigerant thermometer bulb (9) is arranged on the refrigerant through CO2The main pipeline after heat exchange of the heat exchanger (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162451.1A CN113697083B (en) | 2021-09-30 | 2021-09-30 | LNG power CO 2 Cargo hold heat preservation system for transport ship by using fuel cold energy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111162451.1A CN113697083B (en) | 2021-09-30 | 2021-09-30 | LNG power CO 2 Cargo hold heat preservation system for transport ship by using fuel cold energy |
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| Publication Number | Publication Date |
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| CN113697083A true CN113697083A (en) | 2021-11-26 |
| CN113697083B CN113697083B (en) | 2024-02-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114954798A (en) * | 2022-07-07 | 2022-08-30 | 广东海洋大学 | Liquefied carbon dioxide carrier cargo hold heat preservation system utilizing ammonia fuel cold energy |
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| CN113697083B (en) | 2024-02-20 |
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