Temperature complementary water supply method for LNG station gasifier sea water and warm sea water multi-pump station

Abstract

The application discloses a seawater and warm seawater multi-pump station temperature complementary water supply method for a gasifier of an LNG station, and relates to the technical field of LNG station gasifier water supply, in particular to a seawater and warm seawater multi-pump station temperature complementary water supply method for a gasifier of an LNG station. The seawater and warm seawater multi-pump station temperature complementary water supply method for a gasifier of an LNG station comprises the following steps: building a temperature complementary water supply device, wherein the temperature complementary water supply device comprises a plurality of water inlet pump stations, a closed water mixing tank, a plurality of water outlet pump stations and a plurality of gasifiers; judging whether to control the pressure and flow of the water inlet pump stations, the water outlet pump stations and the closed water mixing tank and generate a control instruction according to the quantity ratio of the water outlet pump stations and the gasifiers; and carrying out seawater and warm seawater mixing and outputting of the mixed seawater and warm seawater based on the control instruction, so as to realize seawater and warm seawater multi-pump station temperature complementary water supply for the gasifier of the LNG station. The seawater and warm seawater mixed by the closed water mixer are sent into the gasifier, that is, the low-lift of the seawater pump station and the high water temperature of the warm seawater pump station are utilized, so that the LNG station operation is more energy-saving.

Description

Technical Field

[0001] This invention belongs to the field of temperature complementary water supply technology, and particularly relates to a multi-pump temperature complementary water supply method for seawater and warm seawater in LNG station vaporizers. Background Technology

[0002] LNG is short for Liquid Natural Gas. It is primarily transported by sea, so many large LNG terminals are built near the coast to facilitate the loading and unloading of LNG ships, followed by cryogenic storage of the LNG. LNG terminals can either directly supply LNG to users or vaporize it into natural gas (NG) and transport it to users via pipelines.

[0003] In these coastal LNG terminals, the process of vaporizing LNG into NG requires vaporizers, which in turn require heat. There are various methods for providing heat, and different vaporizers require different heat supply methods. Common vaporizer types include three types: submerged combustion vaporizers (SCVs), open-frame vaporizers (ORVs), and intermediate medium vaporizers (IFVs). SCVs use the NG from the LNG terminal as a heat source, providing heat energy through NG combustion. NG combustion is relatively expensive, emitting CO2, and requires high-power blowers and water pumps as auxiliary equipment, consuming considerable electricity. Therefore, the overall operating cost of SCVs is relatively high. ORVs and IFVs commonly use nearby seawater as a heat source. Seawater is pumped into the vaporizer for heat exchange, and the low-temperature seawater discharged from the vaporizer automatically flows into the sea due to the elevation difference. These high-power water pumps consume considerable electricity. However, because the seawater pumping station is close to the vaporizer, the pumps have a low operating head, resulting in lower electricity consumption for the same seawater flow rate, thus lowering the overall operating cost of ORVs and IFVs. In cold regions, during certain seasons, seawater temperatures are too low or the sea is frozen, failing to provide the heat required by the vaporizer or failing to provide heat for the vaporizer. As a result, ORV and IFV vaporizers cannot operate, and SCV vaporizers must be used, increasing operating costs and carbon emissions.

[0004] LNG terminal technicians and managers are actively exploring methods to utilize warm seawater discharged from nearby power plants, steel mills, chemical plants, and other enterprises to provide heat for the vaporizers. This warm seawater is warmer than regular seawater, contains more heat, and can be used even in winter. To transport this warm seawater to the LNG terminal, a warm seawater pumping station needs to be constructed. Generally, these pumping stations are located far from the LNG terminal, resulting in significant pipeline losses and requiring high pump heads. However, due to the higher temperature of the warm seawater, a smaller flow rate is needed to deliver the same amount of heat. Once the warm seawater pumping station and the seawater pumping station within the LNG terminal are connected, they jointly supply seawater to the ORV and IFV vaporizers within the LNG terminal, providing heat. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a multi-pump temperature complementary water supply method for seawater and warm seawater in LNG station vaporizers, thereby resolving the issues present in the prior art.

[0006] To achieve the above objectives, the present invention provides a method for complementary temperature water supply from multiple pump stations to seawater and warm seawater in an LNG station vaporizer, comprising:

[0007] A temperature-complementary water supply device is constructed, comprising: several inlet pump stations, a sealed mixing tank, several outlet pump stations, and several vaporizers.

[0008] Based on the ratio of the number of water pump stations to the number of gasifiers, determine whether to control the pressure and flow of the water inlet pump station, water outlet pump station, and closed mixing tank, and generate control commands accordingly.

[0009] Based on control commands, the system performs mixing and output operations of seawater and warm seawater, enabling complementary temperature water supply from multiple pump stations for the seawater and warm seawater in the LNG station vaporizer.

[0010] Optionally, the water intake pumping station includes, but is not limited to, a water pump, a slow-closing check valve, an electric valve, a manual valve, and a seawater intake pool, wherein the seawater intake pool, the manual valve, the water pump, the slow-closing check valve, and the electric valve are connected in sequence;

[0011] The water outlet pumping station includes, but is not limited to, a water pump, a slow-closing check valve, an electric valve, a manual valve, and a warm seawater inlet tank, wherein the warm seawater inlet tank, the manual valve, the water pump, the slow-closing check valve, and the electric valve are connected in sequence.

[0012] Optionally, the inlet pump station, the outlet pump station, and the vaporizer are all connected to the sealed mixing tank, wherein the inlet pump station is connected to the sealed mixing tank through the electric valve;

[0013] The sealed mixing tank is connected to the vaporizer via an outlet pump station or an electric valve.

[0014] The water pumping station is connected to the sealed mixing tank via a manual valve and to the gasifier via an electric valve.

[0015] Optionally, the sealed mixing tank includes an inlet, an outlet, an inspection port, and a support.

[0016] Optionally, the process of generating control commands includes: if the ratio of the number of water outlet pump stations to the number of gasifiers is not equal to one, then the pressure and flow rate of the water inlet pump station are set according to the pressure requirement value of the gasifier; if the ratio of the number of water outlet pump stations to the number of gasifiers is equal to one, then the water outlet pressure of the water outlet pump station is set according to the gasifier requirement value; and control commands are generated based on the judgment result.

[0017] Optionally, the process of mixing seawater and warm seawater based on control commands and outputting the mixed mixture includes:

[0018] If the control command includes the pressure and flow rate of the inlet pump station, the pressure and flow rate of the inlet pump station are controlled by speed regulation, and the difference between the outlet pump station and the gasifier is obtained. The opening degree of the electric valve is adjusted according to the difference to control the mixing pressure flowing into the gasifier. If the control command includes the outlet pressure of the outlet pump station, the corresponding outlet pump station is controlled according to the value of the outlet pressure.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] This invention provides a method for temperature-complementary water supply from multiple pump stations to LNG station vaporizers, using seawater and warm seawater. This is achieved by constructing a temperature-complementary water supply device, which includes several inlet pump stations, a sealed mixing tank, several outlet pump stations, and several vaporizers. The method determines whether to control the pressure and flow rate of the inlet pump stations, outlet pump stations, and the sealed mixing tank based on the ratio of the number of outlet pump stations to vaporizers, and generates control commands accordingly. Based on these control commands, the mixing of seawater and warm seawater and the output of the mixed water are performed, ultimately achieving temperature-complementary water supply from multiple pump stations. This invention utilizes a sealed mixing tank to mix seawater and warm seawater before sending it to the vaporizer, leveraging the advantages of both the low head of the seawater pump stations and the high water temperature of the warm seawater pump stations, thus making the LNG station more energy-efficient. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of a multi-pump station temperature complementary water supply device with a single vaporizer and a single electric valve according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of a multi-pump station temperature complementary water supply device with dual vaporizers and dual electric valves according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of a dual-gasifier single-outlet pump station multi-pump station temperature complementary water supply device according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of a dual-gasifier dual-outlet pump station multi-pump station temperature complementary water supply device according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the method flow according to an embodiment of the present invention;

[0027] Reference numerals in the attached diagram: 1. First water pump; 2. First slow-closing check valve; 3. First electric valve; 4. First manual valve; 5. Seawater inlet tank; 6. Second water pump; 7. Second slow-closing check valve; 8. Second electric valve; 9. Second manual valve; 10. Warm seawater inlet tank; 11. Third water pump; 12. Third slow-closing check valve; 13. Third electric valve; 14. Third manual valve; 15. ORV vaporizer; 16. Fourth water pump; 17. Fourth slow-closing check valve; 18. Fourth electric valve; 19. Fourth manual valve; 20. IFV vaporizer; 21. Fifth electric valve; 22. Mixing tank; 23. Sixth electric valve. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a method for complementary temperature water supply from multiple pump stations to the seawater and warm seawater in an LNG station vaporizer, including:

[0032] Three pumping stations supply seawater at different temperatures. The seawater intake pumping station includes a first pump 1, a first slow-closing check valve 2, a first electric valve 3, a first manual valve 4, and a seawater intake pool 5. The warm seawater intake pumping station includes a second pump 6, a second slow-closing check valve 7, a second electric valve 8, a second manual valve 9, and a warm seawater intake pool 10. A mixing tank 22 is sealed. The outlet pipe of the mixing tank 22 connects to a fifth electric valve 21 and an ORV vaporizer 15. The outlets of both the seawater and warm seawater intake pumping stations are connected to the mixing tank 22. The seawater (mixed water) mixed in the mixing tank 22 flows into the ORV vaporizer 15 through the fifth electric valve 21. The pressure and flow rate of the seawater and warm seawater intake pumping stations are controlled by a speed regulation method, ensuring that the outlet pressure of the mixing tank 22 exactly meets the pressure requirements of the ORV vaporizer 15. With the fifth electric valve 21 fully open and no throttling loss, the mixed water flows into the ORV vaporizer 15 to vaporize the LNG. Seawater of different temperatures and warm seawater enter the mixing tank 22 and mix due to the kinetic energy and impact of the water flow. The temperature of the seawater flowing out of the mixing tank 22 tends to be more uniform, with the warm seawater being warmer than the seawater. The warm seawater inlet pump station is farther from the LNG station and farther from the mixing tank 22 than the seawater pump station, resulting in a higher operating head. The seawater inlet pump station is located within the LNG station, closer to the mixing tank 22, and has a lower operating head. In cold winters, the seawater temperature at the seawater intake of the seawater pump station can still be utilized, allowing it to operate primarily to provide flow. After the seawater and warm seawater are mixed, the minimum seawater flow requirement of the vaporizer is met, and the energy waste caused by having to increase the seawater flow rate when the warm seawater pump station operates alone is reduced. This structure and operating method can reduce the power consumption of the long-distance warm seawater pump station and lower the gasification cost of the LNG station.

[0033] Example 2

[0034] like Figure 2 As shown, this embodiment provides a method for complementary temperature water supply from multiple pump stations to the seawater and warm seawater in an LNG station vaporizer, including:

[0035] Three pumping stations transport seawater at different temperatures are provided. The seawater intake pumping station includes a first water pump 1, a first slow-closing check valve 2, a first electric valve 3, a first manual valve 4, and a seawater intake pool 5. The warm seawater intake pumping station includes a second water pump 6, a second slow-closing check valve 7, a second electric valve 8, a second manual valve 9, and a warm seawater intake pool 10. The mixing tank 22 is sealed. The outlet pipe of the mixing tank 22 is connected to the fifth electric valve 21 and the ORV vaporizer 15. The outlets of the seawater intake pumping station and the warm seawater intake pumping station are connected to the mixing tank 22. The seawater (mixed water) mixed in the mixing tank 22 flows into the ORV vaporizer 15 through the fifth electric valve 21 in the first path and into the IFV vaporizer 20 through the sixth electric valve 23 in the second path. The seawater intake pressure required by the IFV vaporizer 20 is higher than that of the ORV vaporizer 15. The pressure and flow rate of the seawater inlet pump station and the warm seawater inlet pump station are controlled by speed regulation to ensure that the outlet pressure of the mixing tank 22 just meets the pressure requirements of the IFV vaporizer 20. The sixth electric valve 23 of the second mixing line is fully open, with no throttling loss. The first mixing line flows into the ORV vaporizer 15. The opening of the electric valve 21 is adjusted, with some throttling loss, to ensure that the pressure of the mixing water flowing into the ORV vaporizer 15 meets the pressure requirements of the ORV. After seawater and warm seawater of different temperatures enter the mixing tank 22, they mix in the tank due to the kinetic energy and impact of the water flow. The temperature of the seawater flowing out of the mixing tank 22 tends to be uniform. The temperature of the warm seawater is higher than that of the seawater. The warm seawater inlet pump station is farther from the LNG station and farther from the mixing tank 22 than the seawater pump station. The warm seawater inlet pump station has a higher operating head. The seawater inlet pump station is located in the LNG station and closer to the mixing tank 22. The seawater inlet pump station has a lower operating head. In cold regions during winter, the temperature of the seawater at the intake of the seawater pumping station can still be utilized to keep the pumping station running, mainly to provide flow. After the seawater and warm seawater are mixed, the minimum seawater flow requirement of the gasifier is met, and the energy waste caused by having to increase the seawater flow when the warm seawater pumping station is running alone is reduced. This structure and operation method can reduce the power consumption of long-distance warm seawater pumping stations and reduce the gasification cost of LNG stations.

[0036] Example 3

[0037] like Figure 3 As shown, this embodiment provides a method for complementary temperature water supply from multiple pump stations to the seawater and warm seawater in an LNG station vaporizer, including:

[0038] Three pumping stations supply seawater at different temperatures. The seawater intake pumping station includes a first water pump 1, a first slow-closing check valve 2, a first electric valve 3, a first manual valve 4, and a seawater intake pool 5. The warm seawater intake pumping station includes a second water pump 6, a second slow-closing check valve 7, a second electric valve 8, a second manual valve 9, and a warm seawater intake pool 10. The mixing tank 22 is sealed. The seawater mixed in the mixing tank 22 flows into the ORV vaporizer 15 via the first electric valve 21, and into the IFV vaporizer 20 via the second water pump 11, slow-closing check valve 12, electric valve 13, and manual valve 14. The pressure and flow rate of the seawater intake pumping station and the warm seawater intake pumping station are controlled by speed regulation to ensure that the outlet pressure of the mixing tank 22 just meets the pressure requirements of the ORV vaporizer 15. The fifth electric valve 21 is fully open, with no throttling loss, and the mixed water flows into the ORV vaporizer 15 to vaporize the LNG. The second stream is pressurized by a mixed-water outlet pump station and fed into the IFV vaporizer 20. The pressure meets the requirements of the IFV vaporizer 20, and the LNG is vaporized. The third electric valve 13 and the third manual valve 14 are both fully open, with no throttling loss. This method is more efficient than... Figure 2 The method is more energy-efficient. The outlets of the seawater inlet pumping station and the warm seawater inlet pumping station are connected to the mixing tank 22, and the inlet of the mixing outlet pumping station is connected to the mixing tank 22. After seawater and warm seawater of different temperatures enter the mixing tank 22, they mix inside the tank due to the kinetic energy and impact of the water flow. The temperature of the seawater flowing out of the mixing tank 22 tends to be more uniform. The temperature of warm seawater is higher than that of seawater. The warm seawater inlet pumping station is farther from the LNG station and farther from the mixing tank 22 than the seawater pumping station. The warm seawater inlet pumping station has a higher operating head. The seawater inlet pumping station is located inside the LNG station and closer to the mixing tank 22. The seawater inlet pumping station has a lower operating head. In cold regions during winter, the temperature of the seawater at the intake of the seawater pumping station can still be utilized to keep the pumping station running, mainly to provide flow. After the seawater and warm seawater are mixed, the minimum seawater flow requirement of the gasifier is met, and the energy waste caused by having to increase the seawater flow when the warm seawater pumping station is running alone is reduced. This structure and operation method can reduce the power consumption of long-distance warm seawater pumping stations and reduce the gasification cost of LNG stations.

[0039] Example 4

[0040] like Figure 4 As shown, this embodiment provides a method for complementary temperature water supply from multiple pump stations to the seawater and warm seawater in an LNG station vaporizer, including:

[0041] Four pumping stations supplying seawater at different temperatures. The seawater intake pumping station includes a first pump 1, a first slow-closing check valve 2, a first electric valve 3, a first manual valve 4, and a seawater intake tank 5. The warm seawater intake pumping station includes a second pump 6, a second slow-closing check valve 7, a second electric valve 8, a second manual valve 9, and a warm seawater intake tank 10. One mixed-water outlet pumping station includes a pump 11, a slow-closing check valve 12, an electric valve 13, a manual valve 14, and an ORV vaporizer 15. Another mixed-water outlet pumping station includes a fourth pump 16, a fourth slow-closing check valve 17, a fourth electric valve 18, a fourth manual valve 19, and an IFV vaporizer 20. The outlets of the seawater intake pumping station and the warm seawater intake pumping station are connected to a mixing tank 22, and the inlets of the two mixed-water outlet pumping stations are connected to the mixing tank 22. Seawater of different temperatures and warm seawater enter the mixing tank 22 and mix due to the kinetic energy and impact of the water flow. The temperature of the seawater flowing out of the mixing tank 22 tends to be more uniform. The temperature of warm seawater is higher than that of seawater. The warm seawater inlet pumping station is farther from the LNG station and farther from the mixing tank 22 than the seawater pumping station. The warm seawater inlet pumping station has a higher operating head. The seawater inlet pumping station is located within the LNG station, closer to the mixing tank 22, and has a lower operating head. Since the ORV vaporizer requires a low seawater input pressure and the IFV vaporizer requires a high seawater input pressure, using two mixing outlet pumping stations to provide the flow rate and pressure according to the vaporizer requirements is more energy-efficient. In cold regions during winter, the temperature of the seawater at the intake of the seawater pumping station can still be utilized to keep the pumping station running, mainly to provide flow. After the seawater and warm seawater are mixed, the minimum seawater flow requirement of the gasifier is met, and the energy waste caused by having to increase the seawater flow when the warm seawater pumping station is running alone is reduced. This structure and operation method can reduce the power consumption of long-distance warm seawater pumping stations and reduce the gasification cost of LNG stations.

[0042] Example 5

[0043] like Figure 5 As shown, this embodiment provides a method for complementary temperature water supply from multiple pump stations to the seawater and warm seawater in an LNG station vaporizer, including:

[0044] The present invention constructs a temperature complementary water supply device, wherein the temperature complementary water supply device includes: several inlet pump stations, a sealed mixing tank, several outlet pump stations, and several vaporizers;

[0045] The inlet pumping station includes, but is not limited to, water pumps, slow-closing check valves, electric valves, manual valves, and seawater inlet tanks, with the seawater inlet tanks, manual valves, water pumps, slow-closing check valves, and electric valves connected in sequence; the outlet pumping station includes, but is not limited to, water pumps, slow-closing check valves, electric valves, manual valves, and warm seawater inlet tanks, with the warm seawater inlet tanks, manual valves, water pumps, slow-closing check valves, and electric valves connected in sequence.

[0046] The inlet pump station, outlet pump station, and vaporizer are all connected to a sealed mixing tank. The inlet pump station is connected to the sealed mixing tank via an electric valve; the sealed mixing tank is connected to the vaporizer via the outlet pump station or an electric valve; the outlet pump station is connected to the sealed mixing tank via a manual valve and to the vaporizer via an electric valve. The sealed mixing tank includes an inlet, an outlet, an inspection port, and a support frame.

[0047] Based on the ratio of the number of water pump stations to the number of gasifiers, determine whether to control the pressure and flow of the water inlet pump station, water outlet pump station, and closed mixing tank, and generate control commands accordingly.

[0048] The process of generating control commands includes: if the ratio of the number of water outlet pump stations to the number of gasifiers is not equal to one, then the pressure and flow rate of the water inlet pump station are set according to the pressure demand value of the gasifier; if the ratio of the number of water outlet pump stations to the number of gasifiers is equal to one, then the water outlet pressure of the water outlet pump station is set according to the gasifier demand value; and control commands are generated based on the judgment results.

[0049] The system operates based on control commands to mix seawater and warm seawater and output the mixed water. If the control command includes information such as the pressure and flow rate of the inlet pump station, the pressure and flow rate of the inlet pump station are controlled by speed regulation. The difference between the outlet pump station and the vaporizer is obtained, and the opening of the electric valve is adjusted according to the difference to control the mixing pressure flowing into the vaporizer. If the control command includes information such as the outlet pressure of the outlet pump station, the corresponding outlet pump station is controlled according to the outlet pressure value. This achieves complementary temperature water supply from multiple pump stations for seawater and warm seawater to the LNG station vaporizer.

[0050] Multiple pumping stations transporting seawater at different temperatures include multiple inlet pumping stations, a sealed mixing tank, and multiple outlet pumping stations. The outlets of the inlet pumping stations are connected to the mixing tank, and the inlets of the outlet pumping stations are connected to the mixing tank. The seawater inlets of multiple vaporizers are also connected to the mixing tank. Seawater of different temperatures enters the mixing tank and mixes thoroughly due to its kinetic energy and impact, resulting in a more uniform temperature of the seawater flowing out of the tank, achieving temperature complementarity. The pumping stations transporting high-temperature seawater have higher operating heads, while those transporting low-temperature seawater have lower operating heads. There are 2-10 inlet pumping stations and 1-20 outlet pumping stations. The sealed mixing tank includes 2-10 inlets, 1-20 outlets, a maintenance manhole, and a support structure.

[0051] In cold regions during winter, the seawater intake of the seawater pumping station is located at a depth below sea level where it does not freeze year-round, so the seawater temperature is still usable. However, if the seawater pumping station operates alone, the heat is insufficient, and the seawater is prone to freezing in the vaporizer. Operating the seawater pumping station in winter, with its low operating head, primarily provides flow. The mixing of seawater and warm seawater satisfies the minimum seawater flow requirement of the vaporizer and reduces the need for the pumping station to increase the seawater flow rate to meet this minimum requirement when operating alone. This structure and operating method can reduce the power consumption of long-distance warm seawater pumping stations and lower the LNG station vaporization cost.

[0052] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for supplying seawater and warm seawater to an LNG station vaporizer using a multi-pump system with complementary temperatures, characterized in that... Includes the following steps: A temperature-complementary water supply device is constructed, comprising: several inlet pump stations, a sealed mixing tank, several outlet pump stations, and several vaporizers. Based on the ratio of the number of water outlet pump stations to the number of vaporizers, determine whether to control the pressure and flow of the water inlet pump station, water outlet pump station and closed mixing tank and generate control commands. Based on control commands, the mixing of seawater and warm seawater and the output of the mixed seawater are carried out to realize the complementary temperature water supply of seawater and warm seawater from multiple pump stations to the LNG station vaporizer. The sealed mixing tank includes an inlet, an outlet, an inspection port, and a support. The process of generating control commands includes: if the ratio of the number of water outlet pump stations to the number of gasifiers is not equal to one, then the pressure and flow rate of the water inlet pump station are set according to the pressure requirement value of the gasifier; if the ratio of the number of water outlet pump stations to the number of gasifiers is equal to one, then the water outlet pressure of the water outlet pump station is set according to the pressure requirement value of the gasifier; and control commands are generated based on the judgment result. The process of mixing seawater and warm seawater based on control commands and outputting the mixed product includes: If the control command includes the pressure and flow rate of the inlet pump station, the pressure and flow rate of the inlet pump station are controlled by speed regulation, and the difference between the outlet pump station and the gasifier is obtained. The opening degree of the electric valve is adjusted according to the difference to control the mixing pressure flowing into the gasifier. If the control command includes the outlet pressure of the outlet pump station, the corresponding outlet pump station is controlled according to the value of the outlet pressure.

2. The method for complementary temperature supply of seawater and warm seawater from multiple pump stations to the LNG station vaporizer according to claim 1, characterized in that, The water intake pumping station includes a seawater intake pumping station and a warm seawater intake pumping station; The seawater intake pumping station includes, but is not limited to, a first water pump, a first slow-closing check valve, a first electric valve, a first manual valve, and a seawater intake pool, wherein the seawater intake pool, the first manual valve, the first water pump, the first slow-closing check valve, and the first electric valve are connected in sequence. The warm seawater inlet pumping station includes, but is not limited to, a second water pump, a second slow-closing check valve, a second electric valve, a second manual valve, and a warm seawater inlet pool. The warm seawater inlet pool, the second manual valve, the second water pump, the second slow-closing check valve, and the second electric valve are connected in sequence. The water outlet pumping station includes a first water outlet pumping station and a second water outlet pumping station; The first water outlet pump station includes, but is not limited to, a third manual valve, a third water pump, a third slow-closing check valve, and a third electric valve, wherein the third manual valve, the third water pump, the third slow-closing check valve, and the third electric valve are connected in sequence. The second water outlet pump station includes, but is not limited to, a fourth manual valve, a fourth water pump, a fourth slow-closing check valve, and a fourth electric valve, which are connected in sequence.

3. The method for complementary temperature supply of seawater and warm seawater from multiple pump stations to the LNG station vaporizer according to claim 2, characterized in that, The seawater inlet pumping station is connected to the sealed mixing tank via the first electric valve, and the warm seawater inlet pumping station is connected to the sealed mixing tank via the second electric valve. The vaporizer includes an ORV vaporizer and an IFV vaporizer; The sealed mixing tank is connected to the ORV vaporizer via a fifth electric valve and to the IFV vaporizer via a sixth electric valve. Alternatively, the sealed mixing tank is connected to the ORV vaporizer via a fifth electric valve, and to the IFV vaporizer via the second outlet pump station; the inlet of the second outlet pump station is connected to the sealed mixing tank via the fourth manual valve, and the outlet of the second outlet pump station is connected to the IFV vaporizer via the fourth electric valve. Alternatively, the sealed mixing tank is connected to the ORV vaporizer via the first outlet pump station and to the IFV vaporizer via the second outlet pump station; the inlet of the first outlet pump station is connected to the sealed mixing tank via the third manual valve, and the outlet of the first outlet pump station is connected to the ORV vaporizer via the third electric valve; the inlet of the second outlet pump station is connected to the sealed mixing tank via the fourth manual valve, and the outlet of the second outlet pump station is connected to the IFV vaporizer via the fourth electric valve.

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