CN113734352A - Gas supply system with re-condensation function and working method - Google Patents
Gas supply system with re-condensation function and working method Download PDFInfo
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- CN113734352A CN113734352A CN202111120929.4A CN202111120929A CN113734352A CN 113734352 A CN113734352 A CN 113734352A CN 202111120929 A CN202111120929 A CN 202111120929A CN 113734352 A CN113734352 A CN 113734352A
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- 238000009833 condensation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002828 fuel tank Substances 0.000 claims abstract description 41
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 32
- 239000000446 fuel Substances 0.000 claims description 27
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000003949 liquefied natural gas Substances 0.000 description 67
- 239000007789 gas Substances 0.000 description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000005420 bog Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013526 supercooled liquid Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000006200 vaporizer Substances 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
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B11/00—Interior subdivision of hulls
- B63B11/04—Constructional features of bunkers, e.g. structural fuel tanks, or ballast tanks, e.g. with elastic walls
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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
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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 relates to the technical field of ships, in particular to a gas supply system with a recondensing function and a working method, wherein the gas supply system comprises a fuel tank, a gas inlet pipe and a gas outlet pipe, wherein the fuel tank is used for storing LNG; the first gas supply pipeline comprises an LNG supply pump, a primary heat exchanger, a high-pressure pump, a secondary heat exchanger and a high-pressure gasifier which are sequentially communicated, the LNG supply pump is communicated with the fuel tank, and the high-pressure gasifier is communicated with high-pressure gas equipment; the second gas supply pipeline comprises a BOG compressor, an inlet of the BOG compressor is communicated with the upper end of the fuel tank, and an outlet of the BOG compressor is communicated with low-pressure gas equipment; and one end of the condensation pipeline is communicated with an outlet of the BOG compressor, and the other end of the condensation pipeline is communicated with the fuel tank and an inlet of the BOG compressor. The invention can reduce the equipment investment and ensure the cooling and recycling efficiency of the BOG.
Description
Technical Field
The invention relates to the technical field of ships, in particular to an air supply system with a recondensing function and a working method.
Background
With the rapid development and the iterative updating of the technology of the marine Gas supply system, the equipment investment cost of the LNG (Liquefied Natural Gas) system is correspondingly reduced. Large ocean-going transport vessels fueled with LNG are gaining an increasing share of the sailing market. The storage of LNG on board inevitably generates excess BOG (Boil Off Gas flash), which increases gradually over time, resulting in a rise in pressure in the LNG bunker, which is a safety hazard for the LNG bunker and the safety of the ship operation.
On large LNG carriers and LNG filling vessels, a large amount of BOG is generated accordingly due to the large LNG tank volume of such vessels. To process and recover these BOGs, such vessels are typically equipped with all reliquefaction devices. There are many kinds of reliquefaction technologies in the LNG industry, and many reliquefaction apparatuses for expansion refrigeration using nitrogen as a refrigerant, such as BOG reliquefaction technology represented by Turbo-Brayton cryogenic system of french liquid air corporation, are used on ships. The technology adopts an inverse Brayton cycle system, nitrogen is used as a circulating cooling medium, the nitrogen is pressurized by an oil-free centrifugal compressor, fresh water and liquid nitrogen are cooled and then enter a centripetal expansion machine for acting to form low-temperature nitrogen meeting the cooling requirement, and then the nitrogen enters a heat exchanger to cool BOG into liquid LNG which is then sent back to a fuel tank.
The other is a Stirling refrigerating device. The working principle of the device is a supercooling mode, liquid at the bottom of the LNG fuel cabin is pumped into the Stirling refrigerator through the immersed pump in the LNG fuel cabin to be supercooled, then the liquid is sprayed to the top of the LNG fuel cabin, BOG gas in the fuel cabin is converted into LNG, and therefore the purpose of reducing the pressure in the cabin is achieved.
Both the two technologies can completely process the BOG generated in the LNG fuel tank, and the two technologies are a preferred solution for LNG transport ships and LNG filling ships with large cargo tank volume and correspondingly large generated BOG amount. However, for a dual-fuel power ship, the LNG fuel tank has relatively small volume, the generated BOG is less, and if the BOG complete recondensing system is used, the outstanding problems of large initial investment of equipment, large size of a reliquefaction device, low refrigeration efficiency and large energy consumption of the equipment exist.
Therefore, there is a need for a gas supply system and method of operation with re-condensation to address the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a gas supply system with a re-condensing function and a working method, which can reduce equipment investment and ensure the cooling and recycling efficiency of BOG.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air supply system with recondensing, comprising:
a bunker for storing LNG;
the first gas supply pipeline comprises an LNG supply pump, a primary heat exchanger, a high-pressure pump, a secondary heat exchanger and a high-pressure gasifier which are sequentially communicated, the LNG supply pump is communicated with the fuel tank, and the high-pressure gasifier is communicated with high-pressure gas equipment;
the second gas supply pipeline comprises a BOG compressor, an inlet of the BOG compressor is communicated with the upper end of the fuel tank, and an outlet of the BOG compressor is communicated with low-pressure gas equipment;
and one end of the condensation pipeline is communicated with an outlet of the BOG compressor, the other end of the condensation pipeline is communicated with inlets of the bunker and the BOG compressor, part of BOG can enter the secondary heat exchanger and pass through the primary heat exchanger for heat exchange and cooling, the BOG which is changed into a liquid state enters the bunker, and the BOG which is in a gaseous state enters the inlet of the BOG compressor.
Furthermore, a throttle expansion valve is arranged on the condensation pipeline, an inlet of the throttle expansion valve is communicated with the first-stage heat exchanger, and an outlet of the throttle expansion valve is respectively communicated with the fuel cabin and an inlet of the BOG compressor.
Furthermore, a gas-liquid separator is arranged on the condensation pipeline, one end of the gas-liquid separator is communicated with an outlet of the throttle expansion valve, and the other end of the gas-liquid separator is respectively communicated with the fuel tank and an inlet of the BOG compressor.
Further, a spraying pipe is arranged at one end of the gas-liquid separator, which is communicated with the fuel compartment, and the spraying pipe is positioned in the fuel compartment.
Furthermore, a plurality of spray headers are arranged on the spray pipe.
Further, a temperature sensor is arranged between the throttle expansion valve and the first-stage heat exchanger.
Furthermore, the throttle expansion valve is an electronic control type throttle expansion valve, and the throttle expansion valve is electrically connected with the temperature sensor.
Further, a flow meter is arranged on the condensation pipeline and located between the outlet of the BOG compressor and the secondary heat exchanger.
Further, the LNG supply pump is provided with two.
A method of operating a gas supply system with recondensing for gas supply and BOG condensation using a gas supply system with recondensing as described above, comprising the steps of:
LNG in the fuel tank is supplied to a high-pressure pump through an LNG supply pump to be pressurized, and is gasified through a high-pressure gasifier and then supplied to high-pressure gas equipment for use;
BOG is pressurized by a BOG compressor and then is supplied to low-pressure gas equipment for use;
and part of the BOG enters a secondary heat exchanger and a primary heat exchanger through a condensation pipeline, the LNG passing through the primary heat exchanger and the secondary heat exchanger is used for cooling and liquefying the BOG, the liquefied BOG enters the fuel tank, and the gaseous BOG enters an inlet of the BOG compressor.
The invention has the beneficial effects that:
the invention provides an air supply system with a re-condensation function. LNG in the fuel tank supplies gas to high-pressure gas equipment through a first gas supply pipeline, and BOG supplies gas to low-pressure gas equipment through a second gas supply pipeline; part BOG enters into second grade heat exchanger and one-level heat exchanger through the condensation pipeline, because the liquefied LNG that circulates between one-level heat exchanger and the second grade heat exchanger utilizes the lower LNG of temperature to cool down BOG, when promoting the LNG temperature on the first air supply pipeline, has reduced BOG's temperature, and BOG condensation after the cooling is liquid entering into the fuel tank, still is gaseous entering into the second air supply pipeline. Through the arrangement, the LNG with lower temperature on the first gas supply pipeline is fully utilized to cool and recover the BOG, so that the cooling and recovering efficiency is improved, and the investment of equipment is reduced.
According to the working method of the gas supply system with the recondensing function, the gas supply system with the recondensing function is used for supplying gas and condensing BOG, so that the equipment investment can be reduced, and the cooling and recycling efficiency of the BOG can be guaranteed.
Drawings
Fig. 1 is a schematic diagram of a gas supply system with recondensing according to the present invention.
In the figure:
10. a fuel compartment; 20. an LNG supply pump; 21. a primary heat exchanger; 22. a high pressure pump; 23. a secondary heat exchanger; 24. a high pressure gasifier; 30. a BOG compressor; 31. a low pressure gas fired device; 40. a throttle expansion valve; 41. a gas-liquid separator; 42. a flow meter; 43. a temperature sensor; 44. and (4) a spray pipe.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The dual-fuel power transport ship comprises, but is not limited to, bulk carriers, oil tankers, container ships, automobile transport ships and the like which use LNG as fuel, and the LNG fuel tanks on the ships can be selected from IMO B type tanks, IMO C type tanks and film tank patent technology of GTT company in France. The LNG bunker volume of a dual fuel powered vessel is small relative to the cargo hold of an LNG carrier, and correspondingly less BOG is produced. The adoption of a BOG total recondensing system would have the outstanding problems of large initial equipment investment, large size of a reliquefaction device, low refrigeration efficiency, and large energy consumption of equipment, and thus, is not suitable for the dual-fuel powered ship.
Moreover, LNG bunker BOG is not allowed to vent directly to the atmosphere as required by IGF regulations. In order to ensure that the pressure in the LNG fuel tank is always kept below the design pressure of the fuel tank, redundant BOG generated in the tank can be also burnt by a dual-fuel boiler for treatment. However, this portion of the burned BOG is not efficiently converted to the energy required on board, resulting in lower fuel utilization on board the vessel, and also increasing the vessel CO2And (4) emission of greenhouse gases. This BOG processing approach is clearly not a preferred option.
In order to solve the above problems, reduce the equipment investment, ensure the cooling and recycling efficiency of the BOG, and improve the economy, as shown in fig. 1, the present invention provides a gas supply system with a recondensing function. The gas supply system with recondensing includes: a fuel compartment 10, a first air supply line, a second air supply line and a condensation line.
Wherein the fuel tank 10 is used for storing LNG; the first gas supply pipeline comprises an LNG supply pump 20, a primary heat exchanger 21, a high-pressure pump 22, a secondary heat exchanger 23 and a high-pressure gasifier 24 which are sequentially communicated, the LNG supply pump 20 is communicated with the fuel compartment 10, and the high-pressure gasifier 24 is communicated with high-pressure gas equipment (a high-pressure dual-fuel direct injection ME-GI low-speed engine with the gas pressure range of 200-350 barG); the second gas supply pipeline comprises a BOG compressor 30, an inlet of the BOG compressor 30 is communicated with the upper end of the fuel tank 10, and an outlet of the BOG compressor 30 is communicated with a low-pressure gas device (a marine generator set and a boiler, wherein the gas pressure of the low-pressure gas device is 4-6barG) 31; one end of the condensing pipeline is communicated with an outlet of the BOG compressor 30, the other end of the condensing pipeline is communicated with inlets of the fuel tank 10 and the BOG compressor 30, part of BOG can enter the secondary heat exchanger 23 and pass through the primary heat exchanger 21 to be subjected to heat exchange and cooled, the liquid BOG enters the fuel tank 10, and the gaseous BOG enters the inlet of the BOG compressor 30.
LNG in the fuel tank 10 supplies gas to the high-pressure gas equipment through a first gas supply pipeline, and BOG supplies gas to the low-pressure gas equipment 31 through a second gas supply pipeline; part of BOG enters into the second heat exchanger 23 and the first heat exchanger 21 through the condensation pipeline, because the liquefied LNG circulates between the first heat exchanger 21 and the second heat exchanger 23, the temperature of the BOG is reduced by the LNG with lower temperature, and when the temperature of the LNG on the first air supply pipeline is increased, the temperature of the BOG is reduced, and the BOG after being cooled is condensed into the liquid state to enter into the fuel tank 10 and still enters into the second air supply pipeline as the gas state. Through the arrangement, LNG with lower temperature on the first gas supply pipeline is fully utilized, so that the cooling and recycling efficiency of BOG is ensured, and the investment of equipment is reduced.
Further, a throttle expansion valve 40 is arranged on the condensation pipeline, an inlet of the throttle expansion valve 40 is communicated with the first-stage heat exchanger 21, and an outlet of the throttle expansion valve 40 is communicated with inlets of the fuel tank 10 and the BOG compressor 30 respectively. A temperature sensor 43 is provided between the expansion valve 40 and the first-stage heat exchanger 21, and detects the temperature of the condensed BOG entering the expansion valve 40. Further, the expansion valve 40 is an electronic control type expansion valve, and the expansion valve 40 is electrically connected to the temperature sensor 43. The opening degree of the electronic control type throttle expansion valve can be adjusted in real time according to the temperature adopted by the temperature sensor 43.
The compressed ambient BOG is heat exchanged with LNG supplied by the LNG supply pump 20 via the secondary heat exchanger 23, and the BOG temperature is reduced from 40-50 c to about-100 c. This portion of the BOG continues to exchange heat with the cold energy delivered by the LNG feed pump 20 through the primary heat exchanger 21, and the temperature of the BOG is further reduced from about-100 ℃ to-130 ℃ and 140 ℃. At this point, the BOG is substantially in a supercooled liquid state. The recondensed BOG (liquid) is then reduced in pressure by the throttle expansion valve 40, and the high-pressure supercooled BOG fluid is reduced in pressure and expanded to a low-pressure gas-liquid two-phase state. During depressurization, part of the recondensed BOG will become flash gas. The function of the throttle expansion valve 40 is to adjust the ratio of the mixture of BOG and LNG that is optimally recovered. Then gas-liquid separation is carried out, and a cycle of the re-condensation process of the BOG part is completed.
In order to facilitate gas-liquid separation, a gas-liquid separator 41 is disposed on the condensation pipeline, one end of the gas-liquid separator 41 is communicated with an outlet of the throttle expansion valve 40, and the other end is communicated with inlets of the bunker 10 and the BOG compressor 30, respectively. The gas-liquid two-phase fluid enters a gas-liquid separator 41, the gas and the liquid are separated, the saturated BOG enters the fuel tank 10, and the separated gas BOG is connected to an inlet pipeline of the BOG compressor 30 for recirculation. For certain situations, the gas-liquid separator 41 is not an essential component, and if the gas-liquid separator 41 is not present, the gas-liquid mixture enters the fuel compartment 10.
Further, a shower pipe 44 is provided at one end of the gas-liquid separator 41 communicating with the fuel compartment 10, and the shower pipe 44 is located in the fuel compartment 10. The provision of the shower pipes 44 facilitates the discharge of the fluid, which is in a liquid state, into the fuel compartment 10.
Further, a plurality of shower heads are provided on the shower pipe 44. By providing multiple showerheads, the rate of fluid discharge into the fuel compartment 10 can be further enhanced.
Further, a flow meter 42 is disposed on the condensation line, and the flow meter 42 is located between the outlet of the BOG compressor 30 and the secondary heat exchanger 23. The flow of the BOG undergoing condensation can be monitored in real time by setting the flow meter 42.
Further, two LNG supply pumps 20 are provided. The two LNG supply pumps 20 are arranged in a redundant manner, and when one of the two LNG supply pumps fails, the other LNG supply pump can still work, so that the stability and the reliability of gas supply to the high-pressure gas equipment are ensured.
Since the temperature within the fuel tank 10 directly affects the BOG recovery efficiency. To improve the recovery efficiency of the condensing circuit, the higher the LNG feed pump 20 outlet pressure, the higher the corresponding BOG recondensation efficiency. However, the increase in the outlet pressure of the LNG feed pump 20 may affect the design of the sealing device of the high-pressure pump 22 downstream thereof, and may even result in a reduction in the service life of the high-pressure pump 22. When the outlet pressure of the LNG supply pump 20 is increased, the LNG vaporization temperature is also increased accordingly. In order to avoid cavitation at the inlet of the high pressure pump 22 and damage to the high pressure pump 22, the LNG feed pump 20 is preferably at a pressure not exceeding 10 barG.
To increase the BOG recovery efficiency, the higher the pressure of the BOG compressor 30, the higher the corresponding BOG recondensation efficiency. The design pressure at the outlet of the BOG compressor 30 is preferably 10 barG.
In view of the reliability of the condensing lines, the BOG compressor 30 is preferably oil-free to ensure that the re-condensed BOG is returned to the LNG tank after a series of processes without any oil content, so that a small amount of oil-containing BOG is not carried to the LNG tank, thereby avoiding contamination of the LNG tank.
It is noted that a return line is provided between the fuel tank 10 and the high-pressure pump 22, and a part of unused LNG can be introduced into the fuel tank 10 through the return line, thereby avoiding waste of LNG.
The embodiment also provides an operation method of a gas supply system with recondensing function, which uses the gas supply system with recondensing function to supply gas and condense BOG, and comprises the following steps:
LNG in the fuel tank 10 is pressurized by the LNG supply pump 20 supplied to the high-pressure pump 22, gasified by the high-pressure vaporizer 24, and supplied to the high-pressure gas-fired facility;
BOG is pressurized by a BOG compressor 30 and then supplied to a low-pressure gas device 31 for use;
and part of the BOG enters the secondary heat exchanger 23 and the primary heat exchanger 21 through a condensation pipeline, the LNG passing through the primary heat exchanger 21 and the secondary heat exchanger 23 is used for cooling and liquefying the BOG, the liquefied BOG enters the fuel tank 10, and the gaseous BOG enters the inlet of the BOG compressor 30 for next circulation.
Compared with the prior art, the gas supply system with the recondensing function provided by the invention has the following advantages: the investment return rate is high (equipment purchasing cost is low), the operation cost is low (no electric energy on a ship is consumed), and the operation is safe and reliable (no extra moving parts and equipment are provided). The invention cools the redundant BOG and recycles the redundant BOG into the fuel tank 10 through a relatively simple and reliable process flow.
The BOG recovered in the fuel tank 10 is supplied to gas-using equipment on the ship as fuel again, so that the fuel utilization rate of the ship is improved, and the emission of greenhouse gas CO2 is reduced.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An air supply system with recondensing, comprising:
a fuel tank (10), said fuel tank (10) for storing LNG;
the first gas supply pipeline comprises an LNG supply pump (20), a primary heat exchanger (21), a high-pressure pump (22), a secondary heat exchanger (23) and a high-pressure gasifier (24) which are sequentially communicated, wherein the LNG supply pump (20) is communicated with the fuel tank (10), and the high-pressure gasifier (24) is communicated with high-pressure gas equipment;
a second gas supply pipeline comprising a BOG compressor (30), wherein an inlet of the BOG compressor (30) is communicated with the upper end of the fuel tank (10), and an outlet of the BOG compressor (30) is communicated with a low-pressure gas device (31);
and one end of the condensation pipeline is communicated with an outlet of the BOG compressor (30), the other end of the condensation pipeline is communicated with inlets of the fuel tank (10) and the BOG compressor (30), part of BOG can enter the secondary heat exchanger (23) and passes through the primary heat exchanger (21) to be subjected to heat exchange and cooling, the BOG which is changed into a liquid state enters the fuel tank (10), and the BOG which is in a gaseous state enters an inlet of the BOG compressor (30).
2. The gas supply system with recondensing function according to claim 1, wherein a throttle expansion valve (40) is disposed on the condensing pipeline, an inlet of the throttle expansion valve (40) is communicated with the primary heat exchanger (21), and an outlet of the throttle expansion valve (40) is communicated with inlets of the bunker (10) and the BOG compressor (30), respectively.
3. The gas supply system with recondensing function according to claim 2, wherein a gas-liquid separator (41) is provided on the condensing line, and one end of the gas-liquid separator (41) communicates with an outlet of the throttle expansion valve (40) and the other end communicates with inlets of the bunker (10) and the BOG compressor (30), respectively.
4. A supply system with recondensing according to claim 3, wherein the end of the gas-liquid separator (41) communicating with the fuel compartment (10) is provided with a shower (44), the shower (44) being located in the fuel compartment (10).
5. A supply system with recondensing according to claim 4, wherein a plurality of showers are provided on the shower pipe (44).
6. An air supply system with recondensing according to claim 2, wherein a temperature sensor (43) is provided between the throttle expansion valve (40) and the primary heat exchanger (21).
7. An air supply system with recondensing according to claim 6, wherein the expansion valve (40) is an electronically controlled expansion valve, and the expansion valve (40) is electrically connected to the temperature sensor (43).
8. A recondensing gas supply system according to claim 1, wherein a flow meter (42) is provided on the condensing line, the flow meter (42) being located between the outlet of the BOG compressor (30) and the secondary heat exchanger (23).
9. A gas supply system with recondensation function according to claim 1, wherein there are two LNG supply pumps (20).
10. A method of operating a gas supply system with recondensing for gas supply and BOG condensation with a gas supply system with recondensing according to any of claims 1 to 9, comprising the steps of:
LNG in a fuel tank (10) is supplied to a high-pressure pump (22) through an LNG supply pump (20) to be pressurized, and is gasified through a high-pressure gasifier (24) and then supplied to a high-pressure gas plant for use;
BOG is pressurized by a BOG compressor (30) and then is supplied to low-pressure gas equipment (31) for use;
and part of the BOG enters a secondary heat exchanger (23) and a primary heat exchanger (21) through a condensation pipeline, the LNG passing through the primary heat exchanger (21) and the secondary heat exchanger (23) is used for cooling and liquefying the BOG, the liquefied BOG enters the fuel tank (10), and the gaseous BOG enters an inlet of the BOG compressor (30).
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| CN202111120929.4A CN113734352A (en) | 2021-09-24 | 2021-09-24 | Gas supply system with re-condensation function and working method |
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| CN202111120929.4A CN113734352A (en) | 2021-09-24 | 2021-09-24 | Gas supply system with re-condensation function and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114379715A (en) * | 2021-12-06 | 2022-04-22 | 沪东中华造船(集团)有限公司 | Ship cabin pressure control system |
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| CN114379715A (en) * | 2021-12-06 | 2022-04-22 | 沪东中华造船(集团)有限公司 | Ship cabin pressure control system |
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