Multi-energy coupling hydrogen production-seawater desalination system using liquid metal magnetic fluid power generation

Abstract

The present application relates to the field of seawater desalination, and more particularly to a multi-energy coupling hydrogen production-seawater desalination system using liquid metal magnetic fluid power generation, comprising a linear concentrating solar device, a liquid metal magnetic fluid power generation device, a humidification and dehumidification seawater desalination device and an electrolytic cell device, the linear concentrating solar device is used for absorbing and converting solar energy, and the liquid metal magnetic fluid power generation device is used for power supply to the humidification and dehumidification seawater desalination device and the electrolytic cell device. Through the linear concentrating solar device, the liquid metal magnetic fluid power generation device can supply power to the humidification and dehumidification seawater desalination device for seawater desalination, and also can supply power to the electrolytic cell device, realizing multi-energy coupling hydrogen production, so as to improve the energy recovery efficiency of the seawater desalination device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seawater desalination, and particularly to a multi-energy coupling hydrogen production-seawater desalination system using liquid metal magnetic fluid power generation. BACKGROUND

[0002] With the continuous progress of science and technology and the continuous development of society, the finiteness of traditional fossil energy and the pollution problems it brings, human beings urgently need a new energy structure to maintain the balance of ecology and social development, so the use of renewable energy and clean energy becomes increasingly important. Among renewable energy, solar energy occupies a dominant position. Since the development of science and technology, people have used various forms and methods of solar energy, mainly including solar thermal utilization and solar electric utilization.

[0003] Magnetic fluid power generation applies Faraday's law of electromagnetic induction. The main use of liquid metal in the magnetic fluid power generation device is electromagnetic induction rather than its heat transfer capacity. When the liquid metal flows through the magnetic field, the magnetic lines of force are cut off, generating an electromotive force in the magnetic field and the flow direction. People usually use magnetic fluid power generation technology combined with solar energy to provide power for seawater desalination, but the energy recovery efficiency of the existing seawater desalination device is not high. SUMMARY

[0004] Based on the technical problems existing in the prior art, the present application provides a multi-energy coupling hydrogen production-seawater desalination system using liquid metal magnetic fluid power generation, which can improve the energy recovery efficiency of the seawater desalination device.

[0005] The technical scheme adopted by the present application to solve its technical problems is to provide a multi-energy coupling hydrogen production-seawater desalination system using liquid metal magnetic fluid power generation, which comprises a linear concentrating solar power device, a liquid metal magnetic fluid power generation device, a humidification and dehumidification seawater desalination device, and an electrolytic cell device. The linear concentrating solar power device is used to absorb and convert solar energy. The liquid metal magnetic fluid power generation device is used to power the humidification and dehumidification seawater desalination device and the electrolytic cell device.

[0006] Further, the linear concentrating solar power device comprises a heliostat field, a central receiver, and a steam generator one and a steam generator two. Sunlight is received by the heliostat field and reflected to the central receiver. The molten salt in the central receiver absorbs heat and circulates in the steam generator one. The steam generator two is connected to a biogas power plant. Biogas in the biogas power plant circulates in the biogas power plant.

[0007] Further, the liquid metal MHD power generation device comprises a mixer one, a separator one and a MHD power generation device one, and a mixer two, a separator two and a MHD power generation device two, the mixer one, the separator one, the mixer two and the separator two are used to mix, separate and input the water vapor output by the steam generator one and the steam generator two into the MHD power generation device one and the MHD power generation device two for power supply.

[0008] Further, the mixer one, the separator one and the MHD power generation device one constitute a high-temperature and high-pressure cycle, and the mixer two, the separator two and the MHD power generation device two constitute a low-temperature and low-pressure cycle.

[0009] Further, the MHD power generation device one and the MHD power generation device two each comprise two magnetic poles with opposite magnetic poles and a generator arranged on the magnetic poles, a liquid metal inlet two and a liquid metal outlet two, a magnetic field is formed between the two magnetic poles, the liquid metal flows into the magnetic field along the liquid metal inlet two and flows out along the liquid metal outlet two. The liquid metal cuts the magnetic induction lines in the magnetic field to generate electromotive force, which is then collected and transmitted by the generator.

[0010] Further, the working medium of the MHD power generation device one is liquid metal bismuth, and the working medium of the MHD power generation device two is liquid metal bismuth-lead.

[0011] Further, the liquid metal outlet two of the MHD power generation device one is in communication with the mixer one, the liquid metal outlet two of the MHD power generation device two is in communication with the mixer two, and the liquid metal after generating a magnetic field in the MHD power generation device one and the liquid metal after generating a magnetic field in the MHD power generation device two can respectively return to the mixer one and the mixer two through the liquid metal outlet two of the MHD power generation device one and the liquid metal outlet two of the MHD power generation device two.

[0012] Further, the humidifying and dehumidifying seawater desalination device comprises a heat accumulator, a condenser, a pressurizing pump, a dehumidifier and a humidifier, and the heat accumulator, the condenser, the pressurizing pump, the dehumidifier and the humidifier are in communication with each other through pipelines.

[0013] Further, the electrolytic cell device comprises a heat exchanger and a PEM electrolytic cell, and the heat exchanger and the PEM electrolytic cell are in communication with each other through pipelines.

[0014] Further, the heat accumulator is in communication with the steam generator one and the steam generator two.

[0015] The beneficial effects of this invention are: it provides a multi-energy coupled hydrogen production-seawater desalination system utilizing liquid metal magnetohydrodynamic (MHD) power generation, comprising a linear concentrating solar energy device, a liquid metal MHD power generation device, a humidification and dehumidification seawater desalination device, and an electrolyzer device. The linear concentrating solar energy device is used to absorb and convert solar energy, and the liquid metal MHD power generation device is used to supply power to the humidification and dehumidification seawater desalination device and the electrolyzer device. By simultaneously supplying power to the humidification and dehumidification seawater desalination device via the linear concentrating solar energy device and the liquid metal MHD power generation device, the system can simultaneously supply power to the electrolyzer device, achieving multi-energy coupled hydrogen production and thereby improving the energy recovery efficiency of the seawater desalination device. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] In the picture: Figure 1 A schematic diagram of the overall structure of the multi-energy coupled hydrogen production-seawater desalination system utilizing liquid metal magnetohydrodynamic power generation provided by the present invention.

[0018] Figure 2 for Figure 1 The diagram shown is a structural schematic of a steam generator.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the mixer.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the separator.

[0021] Figure 5 for Figure 1 The diagram shown is a structural diagram of a magnetohydrodynamic (MHD) power generation device.

[0022] Figure 6 for Figure 1 The diagram shows the structure of the heat exchanger.

[0023] Figure 7 for Figure 1 The diagram shown is a structural diagram of a PEM electrolyzer.

[0024] Figure 8 for Figure 1 The diagram shown is a structural diagram of the heat accumulator.

[0025] Figure 9 for Figure 1 The diagram shows the structure of the condenser.

[0026] Figure 10 for Figure 1 The diagram shown is a structural diagram of a dehumidifier.

[0027] Figure 11For Figure 1 A structure diagram of the humidifier shown in FIG. 1.

[0028] BRIEF DESCRIPTION OF DRAWINGS 100, multi-energy coupling hydrogen production-seawater desalination system using liquid metal MHD power generation; 10, linear concentrating solar power device; 11, heliostat field; 111, heliostat field; 12, central receiver; 13, steam generator one; 131, heat-absorbing working medium inlet one; 132, heat-releasing working medium inlet one; 133, heat-releasing working medium outlet one; 134, heat-absorbing working medium steam outlet one; 14, steam generator two; 20, liquid metal MHD power generation device; 21, mixer one; 211, liquid metal inlet one; 212, water vapor inlet one; 213, mixed working medium outlet one; 22, separator one; 221, mixed working medium inlet one; 222, water vapor outlet one; 223, liquid metal outlet one; 23, MHD power generation device one; 231, magnetic pole; 232, generator; 233, liquid metal inlet two; 234, liquid metal outlet two; 24, mixer two; 25, separator two; 26, MHD power generation device two; 30, humidification and dehumidification seawater desalination device; 31, heat accumulator; 311, water vapor inlet one; 312, preheated water outlet; 313, preheated water inlet; 314, water vapor outlet two; 32, condenser; 321, heat-releasing working medium inlet two; 322, heat-absorbing working medium outlet two; 323, heat-releasing working medium outlet two; 324, heat-absorbing working medium inlet two; 33, pressurizing pump; 34, dehumidifier; 341, air inlet one; 342, air outlet one; 343, seawater outlet one; 344, condensed fresh water outlet; 345, seawater inlet one; 35, humidifier; 351, seawater outlet two; 352, seawater inlet two; 353, air inlet two; 354, air outlet two; 40, electrolyzer device; 41, heat exchanger; 411, heat-releasing working medium inlet three; 412, heat-releasing working medium outlet three; 413, heat-absorbing working medium inlet three; 414, heat-absorbing working medium outlet three; 42, PEM electrolyzer; 421, hot water inlet one; 422, proton exchange membrane; 423, anode oxygen outlet; 424, cathode hydrogen outlet; 50, biogas power plant; 60, seawater supply device; 61, fresh water tank; 62, wastewater tank one; 63, wastewater tank two; 70, oxygen tank; 80, hydrogen tank; 200, power grid user. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be described in detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, and only schematically illustrate the basic principles of the present application, and therefore only show the components related to the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Please refer to Figure 1 The multi-energy coupling hydrogen production-seawater desalination system 100 using liquid metal MHD power generation includes a linear concentrating solar power device 10, a liquid metal MHD power generation device 20, a humidification-dehumidification seawater desalination device 30 and an electrolytic cell device 40. The linear concentrating solar power device 10 is used to absorb and convert solar energy to provide power for the liquid metal MHD power generation device 20, and the liquid metal MHD power generation device 20 is used to power the humidification-dehumidification seawater desalination device 30 and the electrolytic cell device 40.

[0031] The linear concentrating solar power device 10 includes a heliostat field 11, a central receiver 12, a steam generator 1 13 and a steam generator 2 14, wherein the heliostat field 11 is composed of a plurality of heliostats 111, and the central receiver 12 is a pipe collector structure, and the pipe of the central receiver 12 stores molten salt. The specific structure of the heliostat 111 is not described in detail, which is the prior art. The heliostat field 11 can concentrate and reflect sunlight to the pipe of the central receiver 12, so that the molten salt in the pipe receives solar energy and improves the utilization rate of solar energy. Compared with the traditional solar panel, the heliostat field 11 can more efficiently absorb and utilize solar energy, reduce energy cost and reduce environmental pollution.

[0032] The connections between the devices in the drawings are all pipelines, and the lines are used instead of lines in the drawings.

[0033] Please refer to Figure 2, the steam generator one 13 and the steam generator two 14 are provided with the heat-absorbing working medium inlet one 131, the heat-releasing working medium inlet one 132, the heat-releasing working medium outlet one 133 and the heat-absorbing working medium steam outlet one 134. Specifically, the heat-absorbing working medium inlet one 131 is located at the lower left side of the steam generator one 13 and the steam generator two 14, the heat-releasing working medium inlet one 132 is located above the heat-absorbing working medium inlet, the heat-releasing working medium outlet one 133 is located at the lower right side of the steam generator one 13 and the steam generator two 14, and the heat-absorbing working medium steam outlet one 134 is located at the upper right side of the steam generator one 13 and the steam generator two 14. The heat-releasing working medium inlet one 132 and the heat-releasing working medium outlet one 133 of the steam generator one 13 are in communication with the central receiver 12, for accepting the hot molten salt in the central receiver 12 and outputting the molten salt after heat exchange to the central receiver 12, and the heat-releasing working medium inlet one 132 of the steam generator two 14 is in communication with the biogas power plant, for accepting the waste gas with waste heat from the biogas power plant.

[0034] The liquid metal magnetic fluid power generation device 20 comprises a mixer one 21, a separator one 22 and a magnetic fluid power generation device one 23, and a mixer two 24, a separator two 25 and a magnetic fluid power generation device two 26, wherein the mixer one 21, the separator one 22 and the magnetic fluid power generation device one 23 constitute a high-temperature and high-pressure cycle, and the mixer two 24, the separator two 25 and the magnetic fluid power generation device two 26 constitute a low-temperature and low-pressure cycle. The high-temperature and high-pressure cycle and the low-temperature and low-pressure cycle cooperate with each other, so that different liquid metals can quickly switch from a high-temperature and high-pressure state to a low-temperature and low-pressure state, or from a low-temperature and low-pressure state to a high-temperature and high-pressure state during the cycle power generation, without the need for self-slow heating and pressurizing or cooling and depressurizing, thereby improving the loop thermal efficiency, so as to reduce the problem of low thermal efficiency of a single loop.

[0035] Please refer to Figure 3 The mixer one 21 and the mixer two 24 are both provided with a liquid metal inlet one 211, a water vapor inlet one 212 and a mixed working medium outlet one 213. Specifically, in this embodiment, the liquid metal inlet one 211 is arranged at the bottom of the mixer one 21 and the mixer two 24, the water vapor inlet one 212 is arranged on the side wall of the mixer one 21 and the mixer two 24, and the mixed working medium outlet is arranged at the top of the mixer one 21 and the mixer two 24. The water vapor inlet one 212 of the mixer one 21 is in communication with the heat-absorbing working medium steam outlet one 134 of the steam generator one 13 and the heat-absorbing working medium steam outlet one 134 on the steam generator two 14, for receiving the water vapor output by the steam generator one 13 and the steam generator two 14.

[0036] Please refer to Figure 4, the mixed working medium inlet one 221, the water vapor outlet one 222 and the liquid metal outlet one 223 are arranged on the separator one 22 and the separator two 25. Specifically, in the embodiment, the mixed working medium inlet one 221 is arranged at the upper left side of the separator one 22 and the separator two 25, the water vapor outlet one 222 is arranged at the upper right side of the separator one 22 and the separator two 25, and the liquid metal outlet one 223 is arranged at the lower right side of the separator one 22 and the separator two 25. The mixed working medium inlet one 221 of the separator one 22 is communicated with the mixed working medium outlet one 213 of the mixer one 21, and the mixed working medium inlet one 221 of the separator two 25 is communicated with the mixed working medium outlet one 213 of the mixer two 24, for receiving the mixed water vapor and liquid metal in the mixer one 21 and the mixer two 24. The liquid metal in the mixer one 21 is liquid metal bismuth, and the liquid metal in the mixer two 24 is liquid metal bismuth-lead. The water vapor outlet one 222 of the separator one 22 is communicated with the water vapor inlet one 212 of the mixer two 24.

[0037] Please refer to Figure 5 The magnetic fluid power generation device one 23 and the magnetic fluid power generation device two 26 each include two magnetic poles 231 with opposite magnetic polarity and a generator 232 arranged on the magnetic poles 231, and are each provided with a liquid metal inlet two 233 and a liquid metal outlet two 234. The liquid metal inlet two 233 is located at the top end of the magnetic fluid power generation device one 23 and the magnetic fluid power generation device two 26, and the liquid metal outlet two 234 is located at the bottom end of the magnetic fluid power generation device one 23 and the magnetic fluid power generation device two 26. A magnetic field is formed between the two magnetic poles 231, and the liquid metal flows into the magnetic field along the liquid metal inlet two 233 and then flows out along the liquid metal outlet two 234. The liquid metal cuts the magnetic induction lines in the magnetic field to generate electromotive force, which is then collected and transmitted by the generator 232. The liquid metal inlet two 233 of the magnetic fluid power generation device one 23 is communicated with the liquid metal outlet one 223 of the separator one 22, the liquid metal inlet two 233 of the magnetic fluid power generation device two 26 is communicated with the liquid metal outlet one 223 of the separator one 22, the liquid metal outlet two 234 of the magnetic fluid power generation device one 23 is communicated with the liquid metal inlet one 211 of the mixer one 21, and the liquid metal outlet two 234 of the magnetic fluid power generation device two 26 is communicated with the liquid metal inlet one 211 of the mixer two 24, for recycling the liquid metal after generating a magnetic field into the mixer one 21 and the mixer two 24 to continue mixing with the water vapor, forming a circulating power generation.

[0038] The working medium of the magnetic fluid power generation device one 23 is liquid metal bismuth, which is mixed with water vapor in the mixer one 21, and the water vapor gives the liquid metal bismuth the required pressure for circulation, and then the liquid metal bismuth is separated in the separator one 22 by using the density difference, and then enters the magnetic fluid power generation device one 23 to generate electricity.

[0039] The working medium of the MHD power generation device two 26 is liquid metal bismuth-lead, the liquid metal bismuth-lead is mixed with water vapor in the mixer two 24, the water vapor gives the liquid metal bismuth-lead the required pressure for circulation, and the liquid metal bismuth-lead is separated in the separator two 25 by using the density difference, and then enters the MHD power generation device two 26 to generate electricity.

[0040] The humidifying and dehumidifying seawater desalination device 30 comprises a regenerator 31, a condenser 32, a pressurizing pump 33, a dehumidifier 34, a humidifier 35, and a seawater supply device 60 and a fresh water tank 61, a waste water tank one 62, a waste water tank two 63, an oxygen tank 70 and a hydrogen tank 80 for storing seawater and fresh water.

[0041] Please refer to Figure 8 , the regenerator 31 is provided with a water vapor inlet one 311212, a preheated water outlet 312, a preheated water inlet 313 and a water vapor outlet two 314. Specifically, in this embodiment, the regenerator 31 stores water, the water vapor inlet one 311212 is located at the upper left side of the regenerator 31, the preheated water outlet 312 is located at the top end of the regenerator 31, the preheated water inlet 313 is located at the bottom of the regenerator 31, and the water vapor outlet two 314 is located at the lower right side of the regenerator 31. The water vapor inlet two of the regenerator 31 and the water vapor outlet of the separator two 25 are communicated, the preheated water inlet 313 of the regenerator 31 is communicated with the pressurizing pump 33, and the preheated water outlet 312 of the regenerator 31 is communicated with the heat-absorbing working medium inlets of the steam generator one 13 and the steam generator two 14. At the beginning, the water stored in the regenerator 31 is input into the steam generator one 13 and the steam generator two 14 through the preheated water inlet 313, and later, the water vapor output from the separator two 25 enters the condenser 32 to be condensed, and then enters the regenerator 31 to be delivered to the steam generator one 13 and the steam generator two 14 after being pressurized by the pressurizing pump 33.

[0042] Please refer to Figure 9 , the condenser 32 is provided with a heat-releasing working medium inlet two 321, a heat-absorbing working medium outlet two 322, a heat-releasing working medium outlet two 323 and a heat-absorbing working medium inlet two 324. Specifically, in this embodiment, the heat-releasing working medium inlet two 321 is located at the upper left side of the condenser 32, the heat-absorbing working medium outlet two 322 is located at the lower left side of the condenser 32, the heat-releasing working medium outlet two 323 and the heat-absorbing working medium inlet two 324 are both located at the lower right side of the condenser 32, and the heat-absorbing working medium inlet two 324 is located below the heat-releasing working medium outlet two 323. The heat-releasing working medium inlet of the condenser 32 is communicated with the water vapor outlet of the regenerator 31, the heat-releasing working medium outlet of the condenser 32 is communicated with the pressurizing pump 33, and the heat-absorbing working medium inlet of the condenser 32 is communicated with the seawater supply device.

[0043] Please refer to Figure 10The dehumidifier 34 is provided with an air inlet 341, an air outlet 342, a seawater outlet 343, a condensed fresh water outlet 344, and a seawater inlet 345. In this embodiment, the air inlet 341 is located at the upper left side of the dehumidifier 34, the air outlet 342 is located at the lower left side of the dehumidifier 34, the seawater outlet 343 is located at the top end of the dehumidifier 34, the condensed fresh water outlet 344 is located at the bottom left side of the dehumidifier 34, and the seawater inlet 345 is located at the bottom right side of the dehumidifier 34.

[0044] Please refer to Figure 11 The humidifier 35 is provided with a seawater outlet 351, a seawater inlet 352, an air inlet 353, and an air outlet 354. In this embodiment, the seawater outlet 351 is located at the lower left end of the humidifier 35, the seawater inlet 352 and the air inlet 353 are both located at the upper right end of the humidifier 35, the air inlet is located below the seawater inlet, and the air outlet 354 is located at the lower right end of the humidifier 35. The heat-absorbing working medium outlet of the condenser 32 and the seawater inlet of the humidifier 35 are in communication, the air outlet of the humidifier 35 and the air inlet of the dehumidifier 34 are in communication, and the seawater outlet of the humidifier 35 and the heat-absorbing working medium inlet of the condenser 32 are in communication.

[0045] The electrolytic cell device 40 includes a heat exchanger 41 and a PEM electrolytic cell 42, which are in communication with each other through pipelines.

[0046] Please refer to Figure 6 The heat exchanger 41 is provided with a heat-releasing working medium inlet 411, a heat-releasing working medium outlet 412, a heat-absorbing working medium inlet 413, and a heat-absorbing working medium outlet 414. In this embodiment, the heat exchanger 41 is placed horizontally and has a U-shaped structure. The heat-releasing working medium inlet 411 is located at the lower left side of the height direction of the heat exchanger 41, the heat-releasing working medium outlet 412 is located at the upper right side, and the heat-absorbing working medium inlet 413 and the heat-absorbing working medium outlet 414 are both located at the top end of the height direction of the heat exchanger 41. The heat-releasing working medium inlet of the heat exchanger 41 is in communication with the heat-releasing working medium outlet of the steam generator 214, and is used to receive the waste heat biogas after heat exchange in the steam generator 214, thereby recovering waste heat. The heat-absorbing working medium inlet of the heat exchanger 41 and the seawater outlet of the dehumidifier 34 are in communication, and the heat-releasing working medium outlet of the heat exchanger 41 is in communication with the waste water tank.

[0047] Please refer to Figure 7The PEM electrolyzer 42 is provided with a hot water inlet 421, a proton exchange membrane 422, an anode oxygen outlet 423 and a cathode hydrogen outlet 424, and the hot water inlet 421, the proton exchange membrane 422, the anode oxygen outlet 423 and the cathode hydrogen outlet 424 are in communication with each other. Specifically, in the embodiment, the hot water inlet 421 is located at the left side of the PEM electrolyzer 42, the proton exchange membrane 422 is located at the middle of the PEM electrolyzer 42, and the anode oxygen outlet 423 and the cathode hydrogen outlet 424 are both located at the right side of the PEM electrolyzer 42.

[0048] The working principle of the multi-energy coupling hydrogen production-seawater desalination system 100 using liquid metal magnetic fluid power generation provided by the application is as follows: sunlight is received by the heliostat field 11 and reflected to the central receiver 12, the molten salt in the central receiver 12 absorbs the heat of solar energy, and enters the steam generator one 13 through the pipeline to exchange heat with the originally stored water from the heat accumulator 31, so that the water is converted into water vapor output. The steam generator two 14 exchanges heat with the water from the waste gas of the biogas power plant, and the water vapor of the steam generator one 13 and the steam generator two 14 supplies the mixer one 21. The steam generator two 14 provides heat source to the heat exchanger 41 by reacting excess biogas.

[0049] The water vapor then enters the mixer one 21 and mixes with the bismuth metal, the water vapor gives the liquid metal cycle the required pressure, and the water vapor continues to enter the mixer two 24 in the separator one 22 by using the density difference for separation, the water vapor enters the heat accumulator 31, and the liquid metal enters the magnetic fluid power generation device two 26 to generate power, and the magnetic fluid power generation device one 23 supplies power to the electrolyzer device 40, and the magnetic fluid power generation device two 26 supplies power to the power grid user and the pressure pump 33.

[0050] The water vapor separated from the separator two 25 enters the heat accumulator 31, exchanges heat with the water pressurized by the pressure pump 33 in the heat accumulator 31, and then enters the condenser 32, and the condensed water enters the pressure pump 33. The seawater supply device supplies seawater to the dehumidifier 34, exchanges heat with the water vapor in the condenser 32, and then enters the humidifier 35 for humidification, and the air circulates in the dehumidifier 34 and the humidifier 35, a part of the fresh water collected by the dehumidifier 34 is stored in the fresh water tank, and a part of the fresh water is provided to enter the heat exchanger 41, and the waste water of the humidifier 35 is collected by the waste water tank.

[0051] The water vapor of the separator two 25 enters from the water vapor inlet and is transported to the condenser 32 from the water vapor outlet, and the water pressurized by the pressure pump 33 enters from the preheated water inlet 313 and is transported to the two steam generators from the preheated water outlet 312 for water circulation.

[0052] The condensed fresh water enters the heat exchanger 41 to exchange heat with the biogas, the hot water enters the PEM electrolytic cell 42, the second magnetic fluid power generation device 26 supplies power to the PEM electrolytic cell 42, hydrogen ions pass through the proton exchange membrane 422 to combine with electrons at the cathode to become hydrogen gas, and the hydrogen gas is output to the hydrogen tank 80 at the cathode hydrogen gas outlet 424, and oxygen is output to the oxygen tank 70 at the anode oxygen outlet 423.

[0053] Beneficial effects: The liquid metal magnetic fluid power generation device 20 in the application can supply power to the seawater desalination of the humidifying and dehumidifying seawater desalination device 30, and can also supply power to the electrolytic cell device 40, realizing multi-energy coupling hydrogen production; at the same time, the waste gas of the biogas power plant can be used as energy power, and heat energy is provided for electrolysis of the electrolytic cell device 40, realizing waste heat recovery; the water vapor providing heat energy for seawater desalination can be recycled in the steam generator one 13 and the steam generator two 14, reducing the supply of external water. Therefore, the technical scheme of the application can realize multi-directional power supply of the liquid metal magnetic fluid power generation device 20, recycling of waste gas with waste heat in the biogas power plant, recycling of water vapor used in seawater desalination, and reduction of the supply of external water, thereby improving the energy recovery efficiency of the seawater desalination device.

[0054] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection or integral connection, it can be mechanical connection, it can be direct connection or indirect connection through an intermediate medium, it can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0055] It should be understood that the terms "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0056] The above is based on the ideal embodiment of the application, through the above description, relevant personnel can make various changes and modifications without deviating from the scope of the application. The technical scope of the application is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. A multi-energy coupling hydrogen production-seawater desalination system using liquid metal MHD power generation, characterized in that: The application relates to a linear concentrating solar power device, a liquid metal magnetohydrodynamic power generation device, a humidifying and dehumidifying seawater desalination device and an electrolytic cell device, wherein the linear concentrating solar power device is used for absorbing and converting solar energy, the linear concentrating solar power device comprises a heliostat field, a central receiver, a steam generator one and a steam generator two, sunlight is received by the heliostat field and reflected to the central receiver, molten salt in the central receiver absorbs heat and circulates in the steam generator one, the steam generator two is communicated with a biogas power plant, and biogas in the biogas power plant circulates in the biogas power plant; the liquid metal magnetohydrodynamic power generation device comprises a mixer one, a separator one, a magnetohydrodynamic power generation device one, a mixer two, a separator two and a magnetohydrodynamic power generation device two, the mixer one, the separator one and the magnetohydrodynamic power generation device one constitute a high-temperature and high-pressure cycle, the mixer two, the separator two and the magnetohydrodynamic power generation device two constitute a low-temperature and low-pressure cycle, the mixer one, the separator one, the mixer two and the separator two are used for mixing, separating and inputting water vapor output by the steam generator one and the steam generator two into the magnetohydrodynamic power generation device one and the magnetohydrodynamic power generation device two to generate power, the magnetohydrodynamic power generation device one and the magnetohydrodynamic power generation device two each comprise two magnetic poles with opposite magnetism, a generator arranged on the magnetic poles, a liquid metal inlet two and a liquid metal outlet two, a magnetic field is formed between the two magnetic poles, liquid metal flows into the magnetic field through the liquid metal inlet two and flows out through the liquid metal outlet two, the liquid metal cuts magnetic induction lines in the magnetic field to bring electromotive force, and then the electromotive force is collected and transmitted by the generator, the working medium of the magnetohydrodynamic power generation device one is liquid metal bismuth, and the working medium of the magnetohydrodynamic power generation device two is liquid metal bismuth-lead; the liquid metal outlet two of the magnetohydrodynamic power generation device one is communicated with the mixer one, the liquid metal outlet two of the magnetohydrodynamic power generation device two is communicated with the mixer two, and the liquid metal after the magnetic field is generated in the magnetohydrodynamic power generation device one and the liquid metal after the magnetic field is generated in the magnetohydrodynamic power generation device two respectively return to the mixer one and the mixer two through the liquid metal outlet two of the magnetohydrodynamic power generation device one and the liquid metal outlet two of the magnetohydrodynamic power generation device two; the liquid metal magnetohydrodynamic power generation device is used for generating power for the humidifying and dehumidifying seawater desalination device and the electrolytic cell device.

2. The multi-energy coupling hydrogen production-seawater desalination system using liquid metal MHD power generation according to claim 1, characterized in that: The humidifying and dehumidifying seawater desalination device comprises a heat accumulator, a condenser, a pressurizing pump, a dehumidifier and a humidifier, and the heat accumulator, the condenser, the pressurizing pump, the dehumidifier and the humidifier are communicated with each other through pipelines.

3. The multi-energy coupling hydrogen production-seawater desalination system using liquid metal MHD power generation according to claim 1, characterized in that: The electrolytic cell device comprises a heat exchanger and a PEM electrolytic cell, and the heat exchanger and the PEM electrolytic cell are communicated with each other through pipelines.

4. The multi-coupling hydrogen production-seawater desalination system using liquid metal MHD power generation according to claim 2, characterized in that: The heat accumulator is communicated with the steam generator one and the steam generator two.

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