CN114056499A - Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power - Google Patents
Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power Download PDFInfo
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- CN114056499A CN114056499A CN202111400205.5A CN202111400205A CN114056499A CN 114056499 A CN114056499 A CN 114056499A CN 202111400205 A CN202111400205 A CN 202111400205A CN 114056499 A CN114056499 A CN 114056499A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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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
- B63H21/18—Use of propulsion power plant or units on vessels the vessels being powered by nuclear energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/4446—Floating structures carrying electric power plants for converting nuclear energy into electric energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
Abstract
A Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power comprises a steam generation module, wherein a nuclear reactor is arranged in a reactor cabin of the steam generation module, and the nuclear reactor is sequentially connected with a steam generator and a main circulating pump to form a first circulating network; the heat of the saturated steam generated by the steam generator is sequentially supplied to a power generation system, a natural gas liquefaction system, a pump set turbine system, a cabin section heating system, a hybrid steam system and an upper oil gas treatment and public system. The invention overcomes the defects of the prior art, applies the heat energy converted by nuclear energy to each system in the floating device, and each system is stable and reliable, saves energy, protects environment and reduces pollution. Meanwhile, the medium-temperature seawater after the exhaust steam is cooled is applied to a fresh water making system, so that the fresh water demand of a steam system is met, the medium-temperature seawater is effectively utilized, the thermal efficiency of the system is improved, and the environmental damage is reduced.
Description
Technical Field
The invention relates to the technical field of floating liquefied natural gas devices (FLNG), in particular to a floating liquefied natural gas device (FLNG) driving system based on nuclear power.
Background
A floating natural gas liquefaction device (FLNG) is a novel floating production storage and unloading device (FPSO) integrating liquefaction, storage, loading and unloading of offshore natural gas, and the FLNG is a research hotspot in the field of development of deepwater oil-gas fields and large and medium-sized marginal oil-gas fields at present. The driving system of the FLNG is closely related to the FLNG power generation system, the natural gas processing system, the liquefaction system and the storage system, and is a power source of the FLNG factory. At present, the main driving modes of the deep water oil-gas field and the large and medium marginal oil-gas field FLNG are steam turbine driving and gas turbine driving, fossil fuel is combusted to serve as an energy source, and the fuel consumption is large. Taking the FLNG plant with a yield of 200 ten thousand tons/year as an example, the annual gas consumption is respectively 0.19 billion cubic meters and 0.14 billion cubic meters, the annual gas consumption cost is about 5 million, and huge pollution is brought to the environment while a large amount of energy is consumed.
Disclosure of Invention
In order to solve the problems, the invention provides a Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power, which aims to achieve the purposes of reasonably utilizing the nuclear power as energy and avoiding consuming a large amount of fossil fuel and damaging the marine environment, and adopts the technical scheme that:
a Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power comprises a steam generation module, wherein a nuclear reactor is arranged in a reactor cabin of the steam generation module, and the nuclear reactor is sequentially connected with a steam generator and a main circulating pump to form a first circulating network; the steam generator generates saturated steam which respectively enters a power generation system, a natural gas liquefaction system, a pump set turbine system, a cabin section heating system, a miscellaneous steam system and an upper oil gas treatment and public system.
The steam generator is respectively connected with a generator turbine of the power generation system and a refrigerant turbine of the natural gas liquefaction system, 4-8 mpa saturated steam generated by the steam generator does work in the motor turbine and the refrigerant turbine to form exhaust steam which is converged into an exhaust steam header pipe, the exhaust steam header pipe is sequentially connected with a condenser, a condensate pump, a warm water tank, a deaerator, a water feeding pump and a high-pressure water feeding heater, the high-pressure water feeding heater flows back to the steam generator, and a water feeding control valve is arranged between the high-pressure water feeding heater and the steam generator.
The steam generator is connected with a pump set turbine of the pump set turbine system, a cabin section heating system, a miscellaneous steam system and an upper oil gas treatment and public system through a throttling device and then is converged into a steam exhaust main pipe, the steam exhaust main pipe is sequentially connected with a condenser, a condensate pump, a warm water tank, a deaerator, a water feeding pump and a high-pressure water feeding heater, and the high-pressure water feeding heater flows back to the steam generator.
The other end of the warm water tank is connected with a fresh water cabin, a fresh water pump is arranged between the fresh water cabin and the warm water tank, and a warm water tank control valve is arranged between the fresh water pump and the warm water tank.
Seawater is pumped into the condenser and the vacuum boiling type fresh water generator respectively through the seawater pump, the seawater flows back to the sea after heat exchange in the vacuum boiling type fresh water generator, the condenser is sequentially connected with the vacuum boiling type fresh water generator and the fresh water cabin through pipelines, and the seawater enters the vacuum boiling type fresh water generator through the condenser to form fresh water and enters the fresh water cabin.
The natural gas liquefaction system is provided with a refrigerant compressor, a refrigerant heat exchanger, an LNG storage cabin and a condensate oil cabin, wherein the refrigerant compressor is connected with one end of the refrigerant heat exchanger to form a second circulation network, and the other end of the refrigerant heat exchanger is respectively connected with the LNG storage cabin and the gas-liquid separation treatment system; the natural gas is treated by the gas-liquid separation treatment system and then respectively enters the refrigerant heat exchanger and the condensate oil tank.
In the Floating Liquefied Natural Gas (FLNG) drive system based on nuclear power, a voltage stabilizer is further arranged on a path of the main circulating pump to the nuclear reactor and a path of the nuclear reactor to the steam generator in the first circulating network.
The Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power is characterized in that the nuclear reactor is a pressurized water reactor, and the heat carrier is water pressurized to 15-20 mpa.
The Floating Liquefied Natural Gas (FLNG) driving system based on the nuclear power further comprises a cabin section heating system which comprises a dirty oil cabin, a lubricating oil tank, an oil residue cabin and a water generator.
The Floating Liquefied Natural Gas (FLNG) driving system based on the nuclear power further comprises an inert gas deck water seal, a ballast water inter-filter radiator, a cabin washing seawater heater and winter cabin heating.
The Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power further comprises a molecular sieve heater, an amine liquid reboiler, a separation tower reboiler, a condensate stabilizer reboiler, domestic hot water, room heating and pipeline heat tracing heating.
The Floating Liquefied Natural Gas (FLNG) driving system based on the nuclear power further comprises a first liquid level sensor arranged in the warm water tank, and the first liquid level sensor is in signal connection with a warm water tank control valve.
In the Floating Liquefied Natural Gas (FLNG) drive system based on nuclear power, a second liquid level sensor is arranged in the steam generator, and the second liquid level sensor is in signal connection with the water supply control valve.
The Floating Liquefied Natural Gas (FLNG) drive system based on nuclear power is characterized in that the generator turbine is connected with the generator through a pipeline.
In the Floating Liquefied Natural Gas (FLNG) power system based on nuclear power, the heat carrier medium circulating in the first circulation network is water.
The invention has the beneficial effects that:
1. the invention adopts nuclear energy as a power source of the FLNG, applies the heat energy converted by the nuclear energy to heat energy users with different heights, recycles the heat energy carried by the dead steam, and improves the utilization rate of the nuclear energy. The steam is used as a heat carrying medium of the driving system, and has strong heat carrying capacity, safety, reliability and high heat exchange efficiency.
2. The nuclear fuel is used as clean energy, is green, low-carbon, energy-saving, environment-friendly, high in energy density, long in service life of single-pile fuel and strong in power. Nuclear fuel is economical and environmentally friendly for FLNG plants with high energy consumption.
3. A large amount of fresh water resources required by the FLNG nuclear power two-loop steam system adopt warm seawater subjected to heat exchange with exhaust steam in the condenser, and when the heat energy demand of the water making machine is reduced and the water making efficiency is improved, a large amount of warm seawater is utilized due to heat exchange temperature rise in the condenser, so that the direct mass discharge of the warm seawater is reduced, the heat efficiency of the system is improved, and the damage to the ecological environment is reduced.
Drawings
FIG. 1 is a system diagram of the present invention;
wherein: 1-nuclear reactor, 2-steam generator, 3-main circulating pump, 4-voltage stabilizer, 5-throttling device, 6-pump set turbine, 7-generator turbine, 8-sump oil tank, 9-oil residue tank, 10-lubricating oil tank, 11-water making machine, 12-inert gas deck water seal, 13-ballast water inter-filter radiator, 14-washing tank seawater heater, 15-cabin heating, 16-molecular sieve heater, 17-amine liquid reboiler, 18-fractionating tower reboiler, 19-condensate stabilizing tower reboiler, 20-domestic hot water, 21-room heating, 22-pipeline heat tracing, 23-gas-liquid separation treatment system, 24-refrigerant turbine, 25-compressor, 26-refrigerant heat exchanger, 23-refrigerant heat exchanger, 27-LNG storage cabin, 28-condensate oil cabin, 29-vacuum boiling type water making machine, 33-water supply control valve, 34-warm water tank control valve, 35-condenser, 36-condensate water pump, 37-warm water tank, 38-deaerator, 39-water supply pump, 40-high pressure water supply heater, 41-sea water pump, 42-fresh water pump, 43-fresh water cabin and 44-generator.
Detailed Description
The invention is further explained with reference to the drawings.
Example 1
As shown in fig. 1, a Floating Liquefied Natural Gas (FLNG) drive system based on nuclear power includes a reactor cabin, a nuclear reactor is arranged in the reactor cabin, the nuclear reactor adopts a conventional pressurized water reactor, the pressurized water reactor is sequentially connected with a steam generator and a main circulating pump through pipelines, the main circulating pump flows back to the pressurized water reactor to form a first circulating network, a voltage stabilizer is arranged between a passage of the main circulating pump flowing back to the pressurized water reactor and a passage of the pressurized water reactor to the steam generator, and the voltage stabilizer is used for preventing the equipment from being damaged due to overhigh pressure in the first circulating network and preventing the coolant from boiling due to overlow pressure.
The steam generator is respectively connected with a generator turbine of the power generation system and a refrigerant turbine of the natural gas liquefaction system through pipelines, and the generator turbine is connected with the generator. 4mpa-8mpa saturated steam generated in the steam generator is provided for the generator turbine and the refrigerant turbine, after the 4mpa-8mpa saturated steam works in the generator turbine, the heat energy of the steam is converted into mechanical energy, and a generator turbine rotor is connected with the generator to convert the mechanical energy into electric energy for instruments and meters of the whole ship, life and illumination.
The natural gas liquefaction system is also provided with a refrigerant compressor, a refrigerant heat exchanger, an LNG storage cabin and a condensate oil cabin, wherein the refrigerant heat exchanger and the connecting compressor form a second circulation network, the other end of the connecting compressor is connected with a refrigerant turbine, natural gas enters the gas-liquid separation treatment system and is subjected to gas-liquid separation and a series of deacidification, dehydration and demercuration operations, condensate oil obtained by separation is injected into the condensate oil cabin, purified natural gas obtained by separation exchanges heat with high-pressure refrigerant in the refrigerant heat exchanger and is injected into the LNG cabin after being changed into liquid natural gas, low-pressure refrigerant after heat exchange returns to the refrigerant compressor and continues to provide cold energy for the refrigerant heat exchanger after being compressed into high-pressure refrigerant. After the 4-8 mpa saturated steam works in the refrigerant turbine, a refrigerant compressor in the natural gas liquefaction system is driven to operate, the heat energy is converted into mechanical energy, and the low-pressure refrigerant is compressed into high-pressure refrigerant in the refrigerant compressor. The saturated steam acts in the motor turbine and the refrigerant turbine to form exhaust steam which is converged into an exhaust steam header pipe, the exhaust steam header pipe is sequentially connected with a condenser, a condensate pump, a warm water tank, a deaerator, a water feeding pump and a high-pressure water feeding heater, and the high-pressure water feeding heater flows back to the steam generator.
The steam generator enters a pump set turbine system through a throttling device at 1.6-1.96 mpa, drives a pump set turbine to drive a sea water pump, a condensate pump, a fresh water pump and a feed water pump to operate, and high-temperature saturated steam is converged into a steam exhaust main pipe after passing through the pump set turbine. High-temperature saturated steam enters a cabin section heating system, a miscellaneous steam system and an upper oil-gas treatment and public system at a rate of 0.4-0.98 mpa through a throttling device, wherein the cabin section heating system comprises a sump oil tank, a lubricating oil tank, an oil residue tank and a water generator for heating. The miscellaneous steam system comprises a sewage inert gas deck water seal, a ballast water inter-filter radiator, a washing cabin seawater heater and a winter cabin heating system. The upper oil gas treatment and public system comprises a molecular sieve heater, an amine liquid reboiler, a separation tower reboiler, a condensate stabilizer reboiler, domestic hot water, room heating and pipeline heat tracing heating. The high-temperature saturated steam is converged into the dead steam main pipe after acting in each system.
The condenser is sequentially connected with the vacuum boiling type water making machine, the fresh water cabin, the fresh water pump and the warm water tank, a warm water tank control valve is arranged between the fresh water pump and the warm water tank, seawater (low-temperature seawater) in the sea is pumped into the condenser and the vacuum boiling type water making machine respectively through the seawater pump, and in the condenser, exhaust steam in an exhaust steam main pipe enters the condenser to exchange heat with the low-temperature seawater to be condensed into water, and then the water is pumped into the warm water tank by the condensing water pump to be heated. The low-temperature seawater exchanges heat with the exhaust steam in the condenser to form medium-temperature seawater, and the medium-temperature seawater enters the vacuum boiling type fresh water generator; meanwhile, low-temperature seawater in the sea provides low temperature for the condensation of the water making machine in the vacuum boiling type water making machine, the low-temperature seawater forms intermediate temperature seawater after heat exchange in the vacuum boiling type water making machine, the intermediate temperature seawater enters the water making machine after heat exchange with the condenser and flows back to the sea together, the vacuum degree in the vacuum boiling type water making machine is 90%, the seawater is boiled and evaporated when being heated to about 45 ℃ through a steam loop, and the seawater is condensed through the low-temperature seawater and then is supplemented into a fresh water cabin.
A first liquid level sensor is arranged in the warm water tank, a control signal of the first liquid level sensor is connected with a control valve of the warm water tank, when the water level is too low, the control valve of the warm water tank is automatically opened, and fresh water is pumped into the warm water tank from the fresh water cabin by a fresh water pump. After the warm water tank is heated at a low temperature, the circulating heat-carrying medium is deaerated by the deaerator and then pumped into the high-pressure water supply heater by the water supply pump for heating, and the heat-carrying medium is heated by the high-pressure water supply heater to form the heat-carrying medium with the pressure of 7-12 mpa and then enters the steam generator. And 7-12 mpa heat-carrying medium enters a steam generator, and is subjected to heat exchange evaporation with 15-20mpa water from the pressurized water reactor to form 4-8 mpa saturated steam and cooled heat-carrying medium, and the cooled heat-carrying medium is pumped into the pressurized water reactor through a main circulating pump for heating and is continuously circulated in the first circulating network. Providing 4-8 mpa of saturated steam to a power generation system, a natural gas liquefaction system, a pump package turbine system, a cabin section heating system, a utility steam system, and a topside oil and gas treatment and public system.
The steam generator is internally provided with a second liquid level sensor which is in signal connection with the water supply control valve, the second liquid level sensor sends a liquid level signal to the water supply control valve, the water supply control valve supplements heat-carrying media into the steam generator in real time according to the liquid level signal, the heat-carrying media enter the steam generator and exchange heat with 15-20mpa water coming out from the pressurized water reactor for evaporation, and 4-8 mpa high-temperature saturated steam is formed.
The invention overcomes the defects of the prior art, applies the heat energy converted by nuclear energy to the power generation system, the turbine system, the natural gas liquefaction system, the cabin and cargo oil heating system, the miscellaneous steam system and the process system of the upper module of the floating device, has stable and reliable system, saves energy, protects environment and reduces pollution. Meanwhile, the medium-temperature seawater after the exhaust steam is cooled is applied to a fresh water making system, so that the fresh water demand of a steam system is met, the medium-temperature seawater is effectively utilized, the thermal efficiency of the system is improved, and the environmental damage is reduced.
Claims (10)
1. A nuclear power based Floating Liquefied Natural Gas (FLNG) drive system, comprising: the reactor is provided with a steam generating module, a nuclear reactor is arranged in a reactor cabin of the steam generating module, and the nuclear reactor is sequentially connected with a steam generator and a main circulating pump to form a first circulating network; saturated steam generated by the steam generator respectively enters a power generation system, a natural gas liquefaction system, a pump set turbine system, a cabin section heating system, a miscellaneous steam system and an upper oil gas treatment and public system;
the steam generator is respectively connected with a generator turbine of the power generation system and a refrigerant turbine of the natural gas liquefaction system, 4-8 mpa saturated steam generated by the steam generator does work in the motor turbine and the refrigerant turbine to form exhaust steam which is converged into an exhaust steam header pipe, the exhaust steam header pipe is sequentially connected with a condenser, a condensate pump, a warm water tank, a deaerator, a water feeding pump and a high-pressure water feeding heater, the high-pressure water feeding heater flows back to the steam generator, and a water feeding control valve is arranged between the high-pressure water feeding heater and the steam generator;
the steam generator is connected with a pump set turbine of a pump set turbine system, a cabin section heating system, a miscellaneous steam system and an upper oil gas treatment and public system through a throttling device and then is converged into a steam exhaust main pipe, the steam exhaust main pipe is sequentially connected with a condenser, a condensate pump, a warm water tank, a deaerator, a water feeding pump and a high-pressure water feeding heater, and the high-pressure water feeding heater flows back to the steam generator;
the other end of the warm water tank is connected with a fresh water cabin, a fresh water pump is arranged between the fresh water cabin and the warm water tank, and a warm water tank control valve is arranged between the fresh water pump and the warm water tank;
the seawater is pumped into a condenser and a vacuum boiling type fresh water generator by a seawater pump respectively, the seawater flows back to the sea after heat exchange in the vacuum boiling type fresh water generator, the condenser is sequentially connected with the vacuum boiling type fresh water generator and a fresh water cabin by pipelines, and the seawater enters the vacuum boiling type fresh water generator by the condenser to form fresh water and enters the fresh water cabin;
the natural gas liquefaction system is provided with a refrigerant compressor, a refrigerant heat exchanger, an LNG storage cabin and a condensate oil cabin, wherein the refrigerant compressor is connected with one end of the refrigerant heat exchanger to form a second circulation network, and the other end of the refrigerant heat exchanger is respectively connected with the LNG storage cabin and the gas-liquid separation treatment system; the natural gas is treated by the gas-liquid separation treatment system and then respectively enters the refrigerant heat exchanger and the condensate oil tank.
2. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: in the first circulation network, a pressurizer is provided on a path from the main circulation pump to the nuclear reactor and on a path from the nuclear reactor to the steam generator.
3. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the nuclear reactor is a pressurized water reactor, and the heat transfer medium is water pressurized to 15-20 mpa.
4. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the cabin section heating system comprises a dirty oil cabin, a lubricating oil tank, an oil residue cabin and a water making machine.
5. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the miscellaneous steam system comprises an inert gas deck water seal, a radiator between ballast water filters, a seawater washing heater and a winter cabin for heating.
6. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the upper oil gas treatment and public system comprises a molecular sieve heater, an amine liquid reboiler, a separation tower reboiler, a condensate stabilizer reboiler, domestic hot water, room heating and pipeline heat tracing heating.
7. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: a first liquid level sensor is arranged in the warm water tank and is in signal connection with a control valve of the warm water tank.
8. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: and a second liquid level sensor is arranged in the steam generator and is in signal connection with the water supply control valve.
9. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the generator turbine is connected with the generator through a pipeline.
10. The nuclear power based Floating Liquefied Natural Gas (FLNG) drive system of claim 1, wherein: the heat transfer medium circulating in the first circulation network is water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111400205.5A CN114056499A (en) | 2021-11-19 | 2021-11-19 | Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power |
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| CN202111400205.5A CN114056499A (en) | 2021-11-19 | 2021-11-19 | Floating Liquefied Natural Gas (FLNG) driving system based on nuclear power |
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