LNGC-FSRU Multifunctional Steam System

Abstract

This invention relates to the technical field of LNG carriers and floating storage and regasification units (FSRUs), particularly to a multi-functional steam system for LNGC-FSRUs. The system includes an atmospheric venting chamber, a low-pressure steam user, and a regasification desuperheating and depressurization station. The outlet of the atmospheric venting chamber is connected via water pipes to a first-stage water supply heater, auxiliary boilers No. 1, No. 2, and No. 3. The inlet of the first-stage water supply heater is connected to a main condenser and an auxiliary condenser, and the outlet of the first-stage water supply heater is connected to a second-stage water supply heater. This multi-functional steam system not only meets the propulsion, power generation, and heating needs of conventional ships during navigation, but also, after desuperheating and depressurization, is used to heat ethylene glycol, meeting the heat requirements for closed-loop or mixed LNG regasification heating. Furthermore, the supplementary use of the waste gas boiler solves the demand for low-load steam in open regasification mode, reducing energy consumption, protecting the environment, and simplifying ship operation.

Description

Technical Field

[0001] This invention relates to the field of LNG carriers and floating storage and regasification units (FSRUs), specifically to an LNGC-FSRU multifunctional steam system. Background Technology

[0002] Steam systems on ships are primarily used for propulsion, power generation, or heating, typically employing one or more of these functions in conventional vessels. Although the rapid development of electric propulsion has led to the gradual replacement of steam systems by electric drives due to their higher construction costs and generally lower efficiency, steam systems remain an indispensable component of modern industry. Currently, a small number of international projects incorporate closed-loop regasification heating, generally using steam for heating. Adding new types of power generation or heating equipment not only significantly increases construction costs but also increases the operational burden on the crew. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-functional steam system for LNGC-FSRU, which can be modified and upgraded using the existing main steam configuration to create a multi-functional steam system. This system can not only meet the main propulsion and power generation functions of LNGC, but also provide a heat source for closed regasification heating and mixed regasification heating. This reduces construction costs and makes ship operation and management simpler and easier.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an LNGC-FSRU multi-functional steam system, comprising an atmospheric venting chamber, a low-pressure steam user, and a regasification desuperheating and depressurization station. The outlet of the atmospheric venting chamber is connected via water pipes to a first-stage water supply heater, auxiliary boilers NO.1, NO.2, and NO.3. The inlet of the first-stage water supply heater is connected to a main condenser and an auxiliary condenser. The outlet of the first-stage water supply heater is connected to a second-stage water supply heater. The outlet of the second-stage water supply heater is connected via a water pipe to a third-stage water supply heater. The outlet end is connected to main boilers No.1 and No.2, respectively. The outlet ends of main boilers No.1 and No.2 are connected to high-pressure turbines and low-pressure turbines, respectively. The outlet ends of main boilers No.1 and No.2 are also connected to turbine generators No.1 and No.2, respectively. The inlet end of the low-pressure steam user is also connected to a low-pressure steam desuperheating and depressurization station. The outlet end of the regasification desuperheating and depressurization station is connected to a steam / ethylene glycol heat exchanger and a condensate heating system, respectively. The outlet ends of both the steam / ethylene glycol heat exchanger and the condensate heating system are connected to condensate collection cabinets.

[0005] Preferably, the outlets of the main condenser and the auxiliary condenser are both connected to the first-stage water heater via water pipes; the No.1 main boiler is connected to the high-pressure turbine via a superheated steam pipe; the No.2 main boiler is connected to the low-pressure turbine via a superheated steam pipe; the outlets of the No.1 and No.2 main boilers are both connected to the inlet of the main condenser via steam pipes; the outlets of the No.1 turbine generator and the No.2 turbine generator are both connected to the inlet of the main condenser and the auxiliary condenser; the outlets of the No.1 and No.2 main boilers are also connected to the inlet of the regasification desuperheating and pressure reducing station via a superheated steam pipe; the pipe between the auxiliary boiler and the auxiliary condenser is also connected to the inlet of the low-pressure steam user; the outlet of the low-pressure steam user is connected to the inlet of the atmospheric venting chamber; and the inlet of the low-pressure steam desuperheating and pressure reducing station is connected to the No.1 and No.2 main boilers.

[0006] Preferably, the outlet ends of the No.1 auxiliary boiler, No.2 auxiliary boiler and No.3 auxiliary boiler are all connected to the inlet end of the auxiliary condenser through steam pipes, and an exhaust valve is installed on the surface of the pipe between the auxiliary boiler and the auxiliary condenser.

[0007] Preferably, the outlet of the regasification desuperheating and pressure reducing station is interconnected with the steam / ethylene glycol heat exchanger and the condensate heating system via a steam pipeline, and the outlet of the condensate collection tank is interconnected with the inlet of the second-stage water supply heater via a water pipeline.

[0008] Preferably, the superheated steam output of the No.1 main boiler and the No.2 main boiler is 49.5 ton / h, the superheated steam pressure of the No.1 main boiler and the No.2 main boiler is 61.5 barg, and the maximum gas consumption of the No.1 main boiler and the No.2 main boiler is 2941 kg / h.

[0009] Preferably, a forward nozzle control valve is installed on the upper housing of the high-pressure turbine.

[0010] Preferably, the power of the NO.1 turbine generator and the NO.2 turbine generator is 2800kW, the inlet steam pressure of the NO.1 turbine generator and the NO.2 turbine generator is 59barg, and the inlet steam temperature of the NO.1 turbine generator and the NO.2 turbine generator is 510℃.

[0011] Preferably, the steam pipeline of the pressure reducing and desuperheating station adopts two control pipelines, one large and one small, operating in parallel.

[0012] Preferably, the outlet pipeline of the low-pressure steam desuperheating and depressurization station is equipped with pressure and temperature sensors, the outlet pipeline of the low-pressure steam desuperheating and depressurization station is also equipped with a high-pressure and high-temperature alarm, and the outlet end of the low-pressure steam desuperheating and depressurization station is also equipped with a safety valve.

[0013] Preferably, the condensate collection tank is equipped with a temperature sensor and a liquid level sensor, and a safety valve is installed on the inlet pipe of the condensate collection tank.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention's multifunctional steam system not only meets the propulsion, power generation, and heating needs of conventional ships during navigation, but also heats ethylene glycol after desuperheating and depressurization, satisfying the heat requirements for closed or mixed LNG regasification heating. Furthermore, the supplementary use of the waste gas boiler solves the demand for low-load steam in open regasification mode, reduces energy consumption, and is beneficial to environmental protection. In addition to reducing construction costs, it also makes ship operation and management simpler and easier. Attached Figure Description

[0016] Figure 1 It is a structural schematic diagram of the present invention. Detailed Implementation

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Please see Figure 1The LNGC-FSRU multi-functional steam system includes an atmospheric venting compartment, a low-pressure steam user, and a regasification desuperheating and pressure reduction station. The outlet of the atmospheric venting compartment is connected via water pipes to a first-stage water supply heater, auxiliary boilers No. 1, No. 2, and No. 3. The inlet of the first-stage water supply heater is connected to a main condenser and an auxiliary condenser. The outlets of both the main and auxiliary condensers are interconnected with the first-stage water supply heater via water pipes. The outlets of auxiliary boilers No. 1, No. 2, and No. 3 are interconnected with the inlet of the auxiliary condensers via steam pipes. Vent valves are installed on the surface of the pipes between the condensers. A second-stage water supply heater is connected to the outlet of the first-stage water supply heater. A third-stage water supply heater is connected to the outlet of the second-stage water supply heater via a water pipe. The outlets of the third-stage water supply heaters are connected to both main boilers No. 1 and No. 2. High-pressure and low-pressure turbines are connected to the outlets of main boilers No. 1 and No. 2, respectively. Main boiler No. 1 and the high-pressure turbine are interconnected via superheated steam pipes, and main boiler No. 2 and the low-pressure turbine are interconnected via superheated steam pipes. The outlets of main boilers No. 1 and No. 2... The outlets of both main boilers NO.1 and NO.2 are connected to the inlet of the main condenser via steam pipes. The outlets of these two main boilers are also connected to turbine generators NO.1 and NO.2, respectively. The outlets of both turbine generators are connected to the inlet of the main condenser and auxiliary condenser. The outlets of the main boilers NO.1 and NO.2 are also connected to the inlet of the regasification desuperheating and pressure reducing station via superheated steam pipes. The pipe between the auxiliary boiler and the auxiliary condenser is also connected to the inlet of the low-pressure steam user. The inlet of the low-pressure steam user is also connected to a low-pressure steam... The desuperheating and pressure reducing station is interconnected with the outlet of the low-pressure steam user and the inlet of the atmospheric venting chamber. The inlet of the low-pressure steam desuperheating and pressure reducing station is interconnected with the No.1 and No.2 main boilers. The outlet of the regasification desuperheating and pressure reducing station is connected to a steam / ethylene glycol heat exchanger and a condensate heating system. The outlet of the regasification desuperheating and pressure reducing station is interconnected with the steam / ethylene glycol heat exchanger and the condensate heating system through steam pipelines. The outlets of the steam / ethylene glycol heat exchanger and the condensate heating system are both connected to condensate collection tanks. The outlet of the condensate collection tanks is interconnected with the inlet of the second-stage water supply heater through interconnected water pipelines.

[0019] Although most newly built LNG carriers currently use dual-fuel diesel engines or gas turbines for propulsion, boiler steam turbines still account for a significant proportion of LNGC or FSRU projects in service. While their efficiency is relatively lower compared to dual-fuel generators and gas turbines, they offer significant advantages such as high power output, low operating and maintenance costs, long service life, and high reliability. Furthermore, the gas consumption of the main boiler in most projects is greater than the natural evaporation of the liquefied cargo, thus eliminating the need for additional reliquefaction units and reducing construction costs. According to the Rankine cycle principle, the thermal efficiency of using superheated steam to drive a steam turbine is much higher than that using saturated steam. Superheated steam also offers the following advantages:

[0020] a. Water droplets are less likely to form inside the steam turbine, reducing turbine impeller erosion and frictional resistance;

[0021] b. Higher pipe flow velocities (up to 100 m / s) can be used, which can reduce the size of the steam network (provided the pressure drop does not exceed the allowable range).

[0022] c. It only drains water during startup, and no condensate forms in the pipeline after operation, making it especially suitable for long-term operation;

[0023] Therefore, superheated steam is selected for propulsion. Generally, two main marine boilers are configured, namely No. 1 and No. 2. These are equipped with dual-fuel (oil / gas) burners, superheaters, steam drums, water drums, economizers, condensate supply, and heating systems. The main performance parameters of No. 1 and No. 2 main boilers are as follows:

[0024] Superheated steam output: Maximum 49.5 tons / hour;

[0025] Superheated steam pressure: 61.5 barg;

[0026] Superheated steam temperature: 515℃;

[0027] Gas consumption: Maximum 2941 kg / h;

[0028] The main propulsion unit employs a cross-shaft turbine with a tail-connected double reduction gearbox, primarily divided into three units: a high-pressure turbine unit, a low-pressure turbine and condenser unit, and a reduction gearbox unit, facilitating installation and alignment. The turbine housing has openings for steam extraction. The reduction gears are double-reduction, double-helix, tandemly articulated, with the first reduction gear located at the front and the second at the rear. To control the main turbine's output power, a forward-driving nozzle control valve is installed on the upper casing of the high-pressure turbine. A separate reverse control valve is also provided on the turbine, controllable via a lever or button using electric and hydraulic mechanisms. The main parameters of the propulsion turbine are as follows:

[0029] Output shaft power: 21320kW for forward rotation, 7313kW for reverse rotation;

[0030] Control valve inlet steam pressure: 59 barg;

[0031] Control valve inlet steam temperature: 510℃;

[0032] Condenser exhaust vacuum (based on seawater temperature 27°C): 722 mmHgvac.

[0033] In addition, the main condenser and vacuum pump, steam seal condenser, main water supply booster pump, first-stage water supply heater, second-stage water supply heater, third-stage water supply heater, air heater, condensate cabinet, soot blower and DUMP control valve are used as related auxiliary equipment.

[0034] The high-pressure superheated steam generated by the main boiler is mostly used for the propulsion system, with a portion also piped to turbine generators No. 1 and No. 2 for power generation, supplying the ship's electrical needs. In LNGC mode, the maximum power required under normal operating conditions is approximately 5299 kW. Turbine generators No. 1 and No. 2 have a combined power output of 2800 kW, therefore, the two turbine generators can fully cover the ship's electrical load. In FSRU mode, during open regasification heating, the main boiler is shut down, and the required power is supplied by the dual-fuel generators. During closed regasification heating or hybrid regasification heating, the main boiler is operational, and the turbine generators can provide some or all of the power depending on the regasification output. The main parameters of the turbine generators are as follows:

[0035] Power generation capacity: 2800kW;

[0036] Imported steam: 59 barg x 510℃;

[0037] Exhaust vacuum at outlet: 6.7 kPa;

[0038] Rotational speed (turbine / generator): approximately 10,000-18,000 rpm;

[0039] Compared to dual-fuel generators or gas turbines, turbine generators offer advantages such as simple structure, long service life, and low maintenance costs. For LNGC-FSRU projects, turbine generators are particularly suitable for low to medium regasification load conditions. The main boiler provides the heat source for turbine startup, eliminating the need to start other equipment, simplifying operation, and saving manpower.

[0040] In LNGC mode, steam is used not only for propulsion and power generation but also for low-pressure steam users such as: oil tank heating, central air conditioning heating units, room heaters, humidifiers, water makers, fuel oil heaters, hot water heaters, IGG dryers, forced evaporators and LNG evaporators, subsea door flushing, and pipeline heat tracing. In FSRU mode, steam also provides the main heat source for closed-loop or mixed regasification heating. However, if these user facilities directly use superheated steam generated by the main boiler, there will be the following disadvantages:

[0041] a. The heat transfer coefficient of superheated steam is relatively low and easily changes, making it difficult to quantify accurately and thus difficult to select and control heat exchangers precisely.

[0042] b. Some processes will be less efficient when using superheated steam;

[0043] c. The heat exchange equipment used for superheated steam is of a higher grade and more expensive;

[0044] d. The high temperature of superheated steam may damage sensitive equipment;

[0045] Therefore, high-pressure superheated steam needs to be deheated and depressurized to saturated steam before it can be used for heating. A low-pressure steam deheating and depressurization station is installed, which significantly improves the heat transfer coefficient and keeps the temperature essentially constant during steam condensation into water. This facilitates the correct selection and control of heat exchange equipment. To ensure the normal operation of regasification heating in closed or mixed regasification systems, a regasification deheating and depressurization station (REGAS-PRDS) is added to depressurize and cool the superheated steam generated by the main boiler to a saturated steam state for heat exchange with the steam / ethylene glycol plate cooler. The main parameters of the low-pressure steam deheating and depressurization station are as follows:

[0046] Configuration: 2x100%

[0047] Steam flow rate: 1.585-93000 kg / h;

[0048] Steam pressure: reduced from 60 barg to 10.5 barg;

[0049] Steam temperature: Reduce from 515℃ to 192℃;

[0050] Desuperheating water temperature: 75-90℃;

[0051] Desuperheating water pressure: minimum 15 barg;

[0052] Pressure reduction is achieved directly through control valves and pressure control loops, while desuperheating requires adding a certain amount of water to the superheated steam via the desuperheater's mixing device. When the water enters the desuperheater, it absorbs heat from the superheated steam and evaporates, thus reducing the temperature of the superheated steam. Because the steam flow rate of the desuperheating station is relatively high at this point, two control lines, one large and one small, are operated in parallel. When the flow demand is low, only the small flow control line needs to be activated; as the flow gradually increases and exceeds the maximum load of the small flow line, the large flow line will be activated. The outlet pipeline of the low-pressure steam desuperheating and depressurization station is equipped with pressure and temperature sensors to monitor and control the outlet pressure and temperature within the required range, preventing downstream overpressure or overheating. The outlet pipeline of the low-pressure steam desuperheating and depressurization station is also equipped with a high-pressure, high-temperature alarm. In abnormal situations, the inlet shut-off valve can be directly shut off to avoid the risk of damage to the system from high-pressure overheating. A safety valve is also installed at the outlet of the low-pressure steam desuperheating and depressurization station for mechanical protection of the downstream pipeline.

[0053] The de-cooled and depressurized low-pressure steam is sent to the first steam / glycol heat exchanger. Due to the long distance, the temperature after de-cooling is generally maintained at a superheat of 5-7℃ to prevent excessive condensation from forming in the pipeline during transportation, which would affect steam delivery. The main parameters of the steam / glycol plate cooler are as follows:

[0054] Heat exchange load: 21MW;

[0055] Design pressure: 13 barg;

[0056] Design temperature: 205℃;

[0057] Heat exchanger material: 316L stainless steel.

[0058] The condensate after steam / glycol heat exchange needs to be recycled back to the boiler feedwater and also supplied to the desuperheating and pressure reducing station for regasification. The desuperheating water is required to be no less than 75 degrees Celsius. However, due to variations in regasification load, the condensate temperature at the plate cooler outlet fluctuates, ranging from approximately 7 to 80 degrees Celsius. Therefore, a condensate heating system is needed to heat the return condensate to meet the desuperheating water requirements. Since a large adjustment ratio is required to adjust the steam flow from minimum to maximum, the condensate heating system uses three control lines (one large and two small) connected in parallel to control different steam volumes, ensuring the condensate is heated to 80 to 85 degrees Celsius under different load conditions. The main parameters of the condensate heating system are as follows:

[0059] Condensation temperature: Heated from 7-80℃ to 80-85℃;

[0060] Condensate flow rate: 1950-80700 kg / h

[0061] Steam pressure: 9.3-10.2 barg;

[0062] Steam temperature: Approximately 186℃;

[0063] The condensate collection tank is equipped with temperature and level sensors. A safety valve is installed on the inlet pipe of the condensate collection tank. Under abnormal operating conditions (high temperature, high temperature, low level, etc.), there will be corresponding alarms or the inlet steam supply valve will be shut off to avoid the risk of overpressure and overheating in the downstream system.

[0064] After converting the LNGC to an FSRU, three dual-fuel generators were added to supply the increased power load under FSRU operating conditions. To recover and utilize exhaust waste heat, an auxiliary boiler was added to the exhaust pipe outlet of each generator, namely Auxiliary Boiler No.1, Auxiliary Boiler No.2, and Auxiliary Boiler No.3. Each boiler adopts an independent steam drum (DRUM) design and can operate independently. Auxiliary Boiler No.2 is equipped with a burner to ensure normal steam supply in emergency situations such as generator failure. The main parameters of the auxiliary boilers are as follows:

[0065] Configuration: 3x50%;

[0066] Steam pressure generated: 10.5 barg;

[0067] Steam temperature generated: approximately 188°C;

[0068] Steam output: 1200 kg / h;

[0069] The low-pressure steam generated by the auxiliary boiler is sent to the low-pressure steam main in the engine room to supply all steam users in open regasification heating mode or to supplement some low-pressure steam in closed / mixed regasification heating mode. Since the steam output of the exhaust boiler varies with the generator load, when the output exceeds the actual usage, the excess steam can be discharged to the auxiliary condenser through the vent valve (DUMP-VALVE). In FSRU open regasification heating mode, there are fewer steam users, and the steam generated by the auxiliary boiler can fully meet the ship's needs. Therefore, there is no need to restart the main boiler, greatly reducing the burden on the main boiler and improving energy efficiency.

[0070] The main equipment of the LNGC-FSRU multi-functional steam system includes: main boiler, economizer, exhaust gas boiler, high and low pressure turbines, turbine generator, desuperheating and depressurization station, steam heater, and container heating system. The ship is equipped with two main boilers, which use dual-fuel (oil / gas) burners to generate high-pressure superheated steam, serving as the primary heat source for propulsion, power generation, and heating. Additionally, the ship has two economizers and three exhaust gas boilers to recover heat from the exhaust gases of the main boilers and generators. The turbine generators generate enough electricity for all operating conditions. In the FSRU closed-loop regasification heating mode, the superheated steam from the main boilers provides the heating source. This superheated steam is converted into low-pressure steam through the desuperheating and depressurization station, and then the heat is transferred to the regasification heating medium, ethylene glycol, via a steam / ethylene glycol plate cooler. Finally, ethylene glycol heats the LNG for regasification, resulting in natural gas that is then exported.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An LNGC-FSRU multi-functional steam system, comprising an atmospheric venting chamber, a low-pressure steam user, and a regasification desuperheating and depressurization station, characterized in that: The outlet of the atmospheric venting chamber is connected via water pipes to a first-stage water supply heater, auxiliary boilers NO.1, NO.2, and NO.

3. The inlet of the first-stage water supply heater is connected to a main condenser and an auxiliary condenser. The outlet of the first-stage water supply heater is connected to a second-stage water supply heater. The outlet of the second-stage water supply heater is connected via water pipes to a third-stage water supply heater. The outlet of the third-stage water supply heater is connected to main boilers NO.1 and NO.

2. The outlets of main boilers NO.1 and NO.2 are connected to a high-pressure turbine and a low-pressure turbine, respectively. The outlets of main boilers NO.1 and NO.2 are also connected to turbine generators NO.1 and NO.2, respectively. The inlet of the low-pressure steam user is connected to a low-pressure steam desuperheating and pressure reducing station. The regas... The outlet of the desuperheating and pressure reducing station is connected to a steam / ethylene glycol heat exchanger and a condensate heating system. Both the outlets of the steam / ethylene glycol heat exchanger and the condensate heating system are connected to condensate collection tanks. The outlets of the No.1 and No.2 main boilers are interconnected with the inlet of the main condenser via steam pipes. The outlets of the No.1 and No.2 turbine generators are interconnected with the inlet of the main condenser and the auxiliary condenser. The outlets of the No.1 and No.2 main boilers are also interconnected with the inlet of the regasification desuperheating and pressure reducing station via superheated steam pipes. The pipe between the auxiliary boiler and the auxiliary condenser is also interconnected with the inlet of the low-pressure steam user. The outlet of the low-pressure steam user is interconnected with the inlet of the atmospheric venting chamber. The inlet of the low-pressure steam desuperheating and pressure reducing station is interconnected with the No.1 and No.2 main boilers.

2. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The outlets of the main condenser and the auxiliary condenser are connected to the first-stage water supply heater via water pipes. The No.1 main boiler is connected to the high-pressure turbine via a superheated steam pipe, and the No.2 main boiler is connected to the low-pressure turbine via a superheated steam pipe.

3. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The outlet ends of the No.1, No.2 and No.3 auxiliary boilers are all connected to the inlet end of the auxiliary condenser through steam pipes, and exhaust valves are installed on the surface of the pipes between the auxiliary boilers and the auxiliary condenser.

4. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The outlet of the regasification desuperheating and pressure reducing station is connected to the steam / ethylene glycol heat exchanger and condensate heating system via a steam pipeline, and the outlet of the condensate collection tank is connected to the inlet of the second-stage water supply heater via a water pipeline.

5. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The superheated steam output of the No.1 and No.2 main boilers is 49.5 tons / hour, the superheated steam pressure of the No.1 and No.2 main boilers is 61.5 barg, and the maximum gas consumption of the No.1 and No.2 main boilers is 2941 kg / hour.

6. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The high-pressure turbine is equipped with a forward nozzle control valve on its upper housing.

7. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The No.1 and No.2 turbine generators have a power of 2800kW, an inlet steam pressure of 59barg, and an inlet steam temperature of 510℃.

8. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The steam pipeline of the pressure reducing and desuperheating station adopts two control pipelines, one large and one small, operating in parallel.

9. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The outlet pipeline of the low-pressure steam desuperheating and depressurization station is equipped with pressure and temperature sensors, a high-pressure and high-temperature alarm, and a safety valve.

10. The LNGC-FSRU multifunctional steam system according to claim 1, characterized in that: The condensate collection tank is equipped with a temperature sensor and a liquid level sensor, and a safety valve is installed on the inlet pipe of the condensate collection tank.

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