CN117489987A - FSRU cargo control and regasification integrated gas processing system - Google Patents
FSRU cargo control and regasification integrated gas processing system Download PDFInfo
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- CN117489987A CN117489987A CN202311492560.9A CN202311492560A CN117489987A CN 117489987 A CN117489987 A CN 117489987A CN 202311492560 A CN202311492560 A CN 202311492560A CN 117489987 A CN117489987 A CN 117489987A
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- 238000012545 processing Methods 0.000 title claims description 16
- 239000007789 gas Substances 0.000 claims abstract description 106
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 58
- 238000001704 evaporation Methods 0.000 claims abstract description 37
- 230000008020 evaporation Effects 0.000 claims abstract description 36
- 238000003860 storage Methods 0.000 claims abstract description 34
- 238000011282 treatment Methods 0.000 claims abstract description 33
- 230000006837 decompression Effects 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 60
- 239000003345 natural gas Substances 0.000 claims description 30
- 239000000446 fuel Substances 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 4
- 238000005399 mechanical ventilation Methods 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 239000006200 vaporizer Substances 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 5
- 238000011049 filling Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/082—Arrangements for minimizing pollution by accidents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
- F17C9/04—Recovery of thermal energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Public Health (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of LNG transport ships and floating storage and regasification devices (FSRUs), in particular to an FSRU cargo control and regasification comprehensive gas treatment system, which comprises a liquefied natural gas storage cabin, an evaporator and a regasification module, wherein a liquefied natural gas pipeline of the liquefied natural gas storage cabin is communicated with the evaporator, the liquefied natural gas storage cabin is communicated with an evaporation gas pipeline, and the evaporation gas pipeline is respectively communicated with a decompression temperature reduction station, a high-pressure compressor, a light-load compressor 1 and a light-load compressor 2; the gas treatment system provided by the invention can not only meet the requirements of high-efficiency and safe treatment of the evaporated gas, avoid environmental pollution and energy waste, but also provide references and references for different requirements of different projects, and the follow-up actual projects can select proper gas treatment equipment and systems according to different gasifying capacities, local environment protection requirements and the like, so that the high-efficiency and safe treatment of the cargo evaporated gas is performed, the availability and flexibility of FSRU projects are enhanced, and the effective operation of the whole-ship gas treatment system is ensured.
Description
Technical Field
The invention relates to the technical field of LNG transport ships and Floating Storage and Regasification Units (FSRUs), in particular to an FSRU cargo control and regasification integrated gas treatment system.
Background
At present, most of the global mainstream FSRU vapor treatment systems are based on cargo vapor return filling ships for treatment, so that the ships are relatively simple to configure related treatment equipment, generally one or a combination of reliquefaction, a gas combustion unit or an external transmission compressor, and a plurality of treatment equipment are simultaneously equipped. Conventional treatments for excess boil-off gas are typically either combustion or venting to atmosphere. The evaporated gas is directly discharged to the atmosphere, so that energy waste is caused, and global warming and greenhouse effect are caused; direct combustion also increases carbon emissions and causes environmental damage.
Disclosure of Invention
The invention aims to provide an FSRU cargo control and regasification comprehensive gas treatment system which can carry out efficient and safe treatment on cargo evaporated gas, protect environment, avoid energy waste, enhance availability and flexibility of FSRU projects and ensure effective operation of a full-ship gas treatment system.
In order to achieve the above purpose, the present invention provides the following technical solutions: the FSRU cargo control and regasification comprehensive gas treatment system comprises a liquefied natural gas storage cabin, an evaporator and a regasification module, wherein a liquefied natural gas pipeline of the liquefied natural gas storage cabin is communicated with the evaporator, the liquefied natural gas storage cabin is communicated with the evaporation gas pipeline, the evaporation gas pipeline is respectively communicated with a decompression temperature reduction station, a high-pressure compressor, a light-load compressor 1 and a light-load compressor 2, the evaporation gas pipeline is communicated with inlet ends of the high-pressure compressor, the light-load compressor 1 and the light-load compressor 2, outlet ends of the light-load compressor 1 and the light-load compressor 2 are communicated with a main boiler 1 and a main boiler 2, the other end of the natural gas pipeline is respectively communicated with a dual-fuel generator 1, a dual-fuel generator 2, a dual-fuel generator 3 and a gas combustion device, and the evaporation gas pipeline is also respectively communicated with a low-pressure compressor 1, a low-pressure compressor 2 and a low-pressure compressor 3.
Preferably, the outlet of the pressure-reducing and temperature-reducing station is communicated with an evaporation gas pipeline, the outlet end of the regasification module is communicated with the evaporation gas pipeline, the inlet end of the regasification module is communicated with a natural gas pipeline, the other group of outlet ends of the regasification module is communicated with the other group of natural gas pipeline, the outlet end of the high-pressure compressor is communicated with the other group of natural gas pipeline, the inlet end of the pressure-reducing and temperature-reducing station is communicated with the other group of natural gas pipeline, the evaporation gas pipeline is communicated with the inlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3, the outlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3 are communicated with the natural gas pipeline, and the natural gas pipeline is respectively communicated with the inlet ends of the dual-fuel generator 1, the generator 2, the dual-fuel generator 3 and the gas combustion device.
Preferably, the liquefied natural gas storage tank adopts 175000m 3 MOSS type spherical cargo tank design, wherein the design temperature of the liquefied natural gas storage tank is-163 ℃, and the loading and unloading rate of the liquefied natural gas storage tank is 10000m 3 /h。
Preferably, the lng storage tank is raised to a tank pressure setting of 0.7barg.
Preferably, the capacities of the low pressure compressor 1, the low pressure compressor 2 and the low pressure compressor 3 are all 4t/h@6barg.
Preferably, an overpressure protection valve is arranged on the surface of a connecting pipeline between the liquefied natural gas storage cabin and the low-pressure compressor.
Preferably, the low-pressure compressor 1 performs natural vapor treatment, the low-pressure compressor 2 processes surplus vapor, and the low-pressure compressor 3 is kept ready for use.
Preferably, the natural gas pipeline is provided with a main gas fuel valve at the location of the cargo compartment.
Preferably, the natural gas pipeline adopts a double-wall pipe after entering the power module, and the annular space of the double-wall pipe is provided with mechanical ventilation.
Preferably, a liquid natural gas density monitoring device is arranged in the liquefied natural gas storage cabin.
Compared with the prior art, the invention has the following beneficial effects:
the gas treatment system provided by the invention can not only meet the requirements of high-efficiency and safe treatment of the evaporated gas, avoid environmental pollution and energy waste, but also provide references and references for different requirements of different projects, and the follow-up actual projects can select proper gas treatment equipment and systems according to different gasifying capacities, local environment protection requirements and the like, so that the high-efficiency and safe treatment of the cargo evaporated gas is performed, the availability and flexibility of FSRU projects are enhanced, and the effective operation of the whole-ship gas treatment system is ensured.
Drawings
Fig. 1 is a schematic diagram of a system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to FIG. 1, an FSRU cargo control and regasification integrated gas processing system includes liquefied natural gasStorage tank, evaporator and regasification module, since the currently prevailing cargo tank is of the thin film type and spherical type, the thin film type cargo tank is larger in deck space than the spherical cargo tank, is easy for equipment piping arrangement and has a better voyage field of view, but the spherical cargo tank is more effective in preventing sloshing and reducing the evaporation rate of cargo, so the lng storage tank of the system adopts 175000m 3 MOSS type spherical cargo tank design, liquefied natural gas storage tank design temperature of-163 ℃ and liquefied natural gas storage tank loading and unloading rate of 10000m 3 And/h, the liquefied natural gas pipeline of the liquefied natural gas storage cabin is communicated with the evaporator, the liquefied natural gas storage cabin is communicated with the evaporation gas pipeline, the evaporation gas pipeline is respectively communicated with a decompression temperature reduction station, a high-pressure compressor, a light-load compressor 1 and a light-load compressor 2, the evaporation gas pipeline is communicated with the inlet ends of the high-pressure compressor, the light-load compressor 1 and the light-load compressor 2, the outlet of the decompression temperature reduction station is communicated with the evaporation gas pipeline, the outlet end of the regasification module is communicated with the evaporation gas pipeline, the outlet ends of the light-load compressor 1 and the light-load compressor 2 are communicated with a main boiler 1 and a main boiler 2, the inlet ends of the regasification module are communicated with the natural gas pipeline, the other group of outlet ends of the regasification module are communicated with the other group of natural gas pipeline, the outlet end of the high-pressure compressor is communicated with one another through another group of natural gas pipelines, the inlet end of the decompression and temperature reduction station is communicated with one another through another group of natural gas pipelines, the other ends of the natural gas pipelines are respectively communicated with a dual-fuel generator 1, a dual-fuel generator 2, a dual-fuel generator 3 and a gas combustion device, the natural gas pipelines are respectively communicated with the inlet ends of the dual-fuel generator 1, the dual-fuel generator 2, the dual-fuel generator 3 and the gas combustion device, the evaporation gas pipeline is also respectively communicated with a low-pressure compressor 1, a low-pressure compressor 2 and a low-pressure compressor 3, the evaporation gas pipeline is communicated with the inlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3, and the outlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3 are all communicated with the natural gas pipeline.
After the liquefied natural gas is loaded into the cargo tank of the ship, although the cargo tank is insulated at a low temperature, the cargo tank is affected by infiltration and shaking of environmental heat and the like, LNG in the cargo tank or in a pipeline can be vaporized to generate boil-off gas (BOG), when the yield of the boil-off gas is larger than the consumption or absorption amount, the pressure in the cargo tank can continuously rise due to continuous accumulation of the boil-off gas (BOG), the cargo tank pressure is set to be 0.25barg under the conventional LNGC working condition, and the cargo tank pressure is set to be 0.7barg under the FSRU working condition because the loading and unloading frequency is high, the regasification working condition is fused, the liquid level change is large or the characteristics of the vapor (vapor) can not be filled back into the ship are considered, and the higher boil-off gas can be generated relative to the LNGC working condition, so that the cargo pressure setting of the liquefied natural gas storage tank is raised to be 0.7barg, the pressure accumulation (in the cargo tank can effectively reduce the yield of the boil-off gas and increase the capacity of the boil-off gas under the complex working condition. Under the condition of minimum fuel gas consumption, according to different liquid levels, the cabin pressure can be increased to prolong the storage time of the evaporated gas by 5 to 20 days.
At least two evaporation gas treatment modes are provided for the LNG carrier according to the IGC-CODE. The primary mode of the pretreatment evaporation gas is forced combustion by a main boiler, and the generated superfluous steam is subjected to condensation emission (steam-dump) treatment by a seawater cooling condenser; the secondary treatment mode releases the exhaust atmosphere (used only in emergency situations) by means of a manual vent valve or safety valve. Because the FSRU is mainly in an open heating mode during operation, the main boiler stops running at the moment, and meanwhile, steam-condensing emission (steam-dump) has a certain influence on the seawater environment, the following three BOG treatment modes are added after modification.
(1) Generating power by delivering boil-off gas to the dual-fuel generator 1, the dual-fuel generator 2 and the dual-fuel generator 3 for operation, and supplying electric power required for operation of the marine equipment;
(2) re-condensing the redundant evaporated gas by an LNG buffer tank of the re-gasification module, and conveying the redundant evaporated gas to the shore along with the externally conveyed gas;
(3) conveying the evaporator to the shore directly by a high-pressure compressor;
(4) in case of emergency, the excess boil-off gas is burned by a gas burner (GCU).
The original ship is provided with 2 double-fuel main boilers for turbine propulsion and power generation. After modification, the main boiler is in a cold state closed state in a conventional open gasification heating mode, so that the redundant evaporated gas cannot be directly and timely treated through forced combustion. The low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3 are additionally arranged on the existing ship and used for supplying and processing conventional fuel gas, each capacity is 4t/h@6barg, and the processing of natural evaporation gas (about 3.6 t/h) can be satisfied by 1 low-pressure compressor under conventional working conditions; when the liquefied natural gas storage cabin is filled, the second low-pressure compression can be started at any time to treat the redundant vapor according to factors such as different filling rates and whether the replacement gas returns to the cabin, and the third compressor is kept for standby. The low pressure compressor supplies low pressure gas to the following primary users:
(1) a dual fuel generator;
(2) a REGAS recondenser, i.e., a REGAS module;
(3) gas Combustion Unit (GCU).
When the consumption of the gas is lower than the minimum discharge capacity requirement of the low-pressure compressor, an overpressure protection valve is arranged on the surface of a connecting pipeline between the liquefied natural gas storage cabin and the low-pressure compressor, and excessive gas is returned to the cabin through the Overpressure Protection Valve (OPV). The dual-Fuel generator uses evaporated Gas as Fuel under the conventional FSRU working condition, and as the cabin where the generator is located is divided into a class A machine place according to the marine life safety convention (SOLAS), the high fire risk is achieved, a main Gas Fuel Valve (Fuel-Gas-Master-Valve) is arranged at the position of a cargo compartment area of a natural Gas pipeline, the main Gas Fuel Valve is used for emergency cutting, the natural Gas pipeline penetrates through the right outdoor area of the living area to be connected in a full butt welding manner, a double-wall pipe is adopted after the natural Gas pipeline enters a power module, and the annular space of the double-wall pipe is provided with mechanical ventilation to enable the interior of the double-wall pipe to be kept in a negative pressure state, and the ventilation times are not less than 30 times/hour.
The evaporation rate of the real ship is changed according to weather conditions, components of the liquefied natural gas storage tanks and liquid levels, and the increase or decrease of the tank pressure can also influence the evaporation rate. Sometimes, the generation amount of the evaporation gas in the cabin is small due to cold weather and the like, and the evaporation gas is insufficient to support the normal electricity consumption on the ship, and at the moment, if the external transmission system operates normally, the evaporation gas can be returned to a gas main pipe to supplement the evaporation gas (BOG) through decompression, precooling and gas-liquid separation treatment through an external transmission cabin pipeline, or a forced evaporator in a cargo equipment room is started to supplement the gas generated by LNG gasification through steam heating. The gas combustion device (GCU) carries out combustion treatment on the surplus evaporating gas which cannot be treated, and the combustion treatment is not started under the conventional working condition because the combustion treatment also has certain air pollution. Under the emergency working condition, the fuel gas can be supplied through the low-pressure compressor, and the fuel gas can also be directly taken out after passing through the fuel gas heater between the cargo machinery from the gas main pipe.
Under the operation condition of the regasification system, redundant low-pressure gas can be sent to the regasification module through a pressure control valve, cooled by an evaporation gas condenser and then sent to a buffer tank for recondensing. The rated recondensing amount can reach 8t/h, and the total amount supplied by 2 low-pressure compressors can be simultaneously satisfied. Of course, the amount of recondensed is proportional to the amount of recondensed, and the minimum recondensed (minimum output 9 t/h) is 0.84ton/h.
The liquid natural gas continuously absorbs external heat in the cabin, the top light components volatilize first, so that the heavy components of the liquid natural gas accumulate, and the density is increased. While the bottom liquid natural gas density is unchanged, thus creating the notion of upside down heavy and light. The top heavier liquid natural gas can turn to the bottom after exceeding the critical point, and the liquid natural gas at the bottom can be transferred to the top of the cabin, and the rolling phenomenon of the liquid natural gas can be accompanied by the generation of a large amount of evaporated gas, which can be 10 times to 20 times of the normal working condition. And thus may cause the relief valve to trip, and the boil-off gas is discharged into the atmosphere in large amounts, causing serious safety risks. FSRU is more prone to rolling over LNGC due to factors such as perennial dock, long hold-up time of LNG in the cabin (i.e., LNG aging), etc. To avoid this, the system adds a liquid natural gas density monitoring device, while adding a top injection line in the cabin number 2, 3. Once the layering of the liquid natural gas is detected, a corresponding alarm is given to remind a shipman to process, for example, the liquid natural gas at the bottom is lightered to the top through a top injection pipeline; in order to meet the high utilization rate requirements of the ship in 20 years without docking and running, and meanwhile, the supply of regasified natural gas cannot be influenced in the liquid natural gas filling, unloading or lightering operation, a new maintenance main pipe is added after modification to replace the role of an original ship LNG main pipe in maintenance (warming cabin, gas replacement or inerting and the like), and corresponding isolation facilities are added to the inlet and outlet of the gas/liquid pipeline of a single cargo tank, so that the single cargo tank is ensured not to influence the related operations of filling, unloading, lightering and the like of other liquid natural gas of the whole ship during maintenance.
The system enhances the capability and selection of FSRU projects for vapor treatment by optimizing or adding equipment or systems for vapor treatment of cargo. The FSRU cargo control and regasification integrated gas processing system comprises cargo storage, cabin pressure control, user management, LNG roll prediction and prevention, cargo hold maintenance, regasification and recondensing equipment and other key points. The main equipments are main boilers, high/low pressure compressors, dual fuel generators, evaporators, recondensing equipments, gas Combustion Units (GCU), gas-liquid separation tanks, etc.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
- An fsru cargo control and regasification integrated gas processing system including a lng storage tank, a vaporizer, and a regasification module, characterized in that: the utility model discloses a low-pressure natural gas boiler is characterized in that a liquefied natural gas pipeline of a liquefied natural gas storage cabin is communicated with an evaporator, the liquefied natural gas storage cabin is communicated with an evaporation gas pipeline, the evaporation gas pipeline is respectively communicated with a decompression temperature reduction station, a high-pressure compressor, a light-load compressor 1 and a light-load compressor 2, the evaporation gas pipeline is communicated with inlet ends of the high-pressure compressor, the light-load compressor 1 and the light-load compressor 2, outlet ends of the light-load compressor 1 and the light-load compressor 2 are communicated with a main boiler 1 and a main boiler 2, the other end of the natural gas pipeline is respectively communicated with a dual-fuel generator 1, a dual-fuel generator 2, a dual-fuel generator 3 and a gas combustion device, and the evaporation gas pipeline is also respectively communicated with a low-pressure compressor 1, a low-pressure compressor 2 and a low-pressure compressor 3.
- 2. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the outlet of the decompression and temperature reduction station is communicated with an evaporation gas pipeline, the outlet end of the regasification module is communicated with the evaporation gas pipeline, the inlet end of the regasification module is communicated with a natural gas pipeline, the other group of outlet ends of the regasification module is communicated with the other group of natural gas pipeline, the outlet end of the high-pressure compressor is communicated with the other group of natural gas pipeline, the inlet end of the decompression and temperature reduction station is communicated with the other group of natural gas pipeline, the evaporation gas pipeline is communicated with the inlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3, the outlet ends of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3 are communicated with the natural gas pipeline, and the natural gas pipeline is respectively communicated with the inlet ends of the generator 1, the dual-fuel generator 2, the generator 3 and the gas combustion device.
- 3. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the saidThe liquefied natural gas storage cabin adopts 175000m 3 MOSS type spherical cargo tank design, wherein the design temperature of the liquefied natural gas storage tank is-163 ℃, and the loading and unloading rate of the liquefied natural gas storage tank is 10000m 3 /h。
- 4. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the lng storage tanks are raised to a tank pressure setting of 0.7barg.
- 5. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the capacities of the low-pressure compressor 1, the low-pressure compressor 2 and the low-pressure compressor 3 are all 4t/h@6barg.
- 6. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: and an overpressure protection valve is arranged on the surface of a connecting pipeline between the liquefied natural gas storage cabin and the low-pressure compressor.
- 7. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the low-pressure compressor 1 carries out natural evaporation gas treatment, the low-pressure compressor 2 processes redundant evaporation gas, and the low-pressure compressor 3 is kept for standby.
- 8. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the natural gas pipeline is provided with a main gas fuel valve at the position of the cargo hold area.
- 9. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: the natural gas pipeline adopts a double-wall pipe after entering the power module, and the annular space of the double-wall pipe is provided with mechanical ventilation.
- 10. The FSRU cargo control and regasification integrated gas processing system of claim 1, wherein: and a liquid natural gas density monitoring device is arranged in the liquefied natural gas storage cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311492560.9A CN117489987A (en) | 2023-11-09 | 2023-11-09 | FSRU cargo control and regasification integrated gas processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311492560.9A CN117489987A (en) | 2023-11-09 | 2023-11-09 | FSRU cargo control and regasification integrated gas processing system |
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