Light salt preparation integrated device and method, and electrolytic bath waste heat cold electricity light salt co-production system and method comprising light salt preparation integrated device

Abstract

The invention discloses a light salt preparation integrated device and method, and an electrolytic bath waste heat cold electricity light salt co-production system and method comprising the light salt preparation integrated device. The light salt preparation integrated device comprises an upper-stage light salt separation module and a lower-stage condensation light preparation module. The electrolytic bath waste heat cold electricity light salt co-production system comprises a power module, a cascade refrigeration module, a light salt preparation module and a hydrogen purification module. The light salt preparation integrated device disclosed by the invention can be used for preparing light salt by utilizing a freezing desalination method, and the supplement process and the cost of the electrolyte are simplified. And the electrolytic bath waste heat cold electricity light salt co-production system can drive the system to perform multi-effect co-production and purify hydrogen through coupling linkage among different modules by taking waste heat of seawater electrolysis hydrogen production as a heat source, so that the hydrogen purification process is simplified, and the overall cost of seawater electrolysis hydrogen production is reduced.

Description

Technical Field

[0001] The present invention relates to the field of desalinated salt preparation devices and thermal cycle systems, and in particular to an integrated desalinated salt preparation device and method, and an electrolytic cell waste heat cooling and electricity desalinated salt cogeneration system and method comprising the same. Background Art

[0002] As a clean energy with high energy density, hydrogen fuel can be used as an energy carrier to replace gasoline, diesel and other direct combustion, and is also an important industrial gas. In the face of potential large-scale hydrogen demand, water electrolysis is considered to be the most feasible clean hydrogen production technology. There are two methods for hydrogen production by electrolysis of seawater. One is to desalinate seawater by seawater desalination technology before electrolysis, and the other is to directly electrolyze seawater to produce hydrogen. However, the high electricity consumption cost of seawater electrolysis hydrogen production, the cost of electrolyte replenishment and the complexity of hydrogen purification process are the main factors limiting the development of seawater electrolysis hydrogen production and reducing its cost. In the direct seawater electrolysis hydrogen production equipment, it is also necessary to properly remove ion components to ensure the long-term stable operation of the electrolysis equipment. Therefore, it is desirable to use the waste heat of seawater electrolysis hydrogen production for cold electricity and salt desalination multi-effect cogeneration and use its different products for hydrogen purification and electrolyte replenishment to reduce the overall cost of water electrolysis hydrogen production. The thermal cycle system is extremely effective in waste heat utilization, and has diverse operating modes and production benefits.

[0003] The present invention is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The present invention proposes an integrated device for preparing desalinated salt and an electrolytic cell waste heat cooling and electricity desalinated salt cogeneration system. The integrated device for preparing desalinated salt of the present invention utilizes a freezing desalination method to prepare desalinated salt, and at the same time serves as a core component of an electrolytic cell waste heat cooling and electricity desalinated salt cogeneration system of the present invention. The system uses the waste heat of the electrolytic cell mixed liquid used to produce hydrogen by electrolysis of water as a heat source to drive an electrolytic cell waste heat cooling and electricity desalinated salt cogeneration system coupled by an organic Rankine cycle, an absorption refrigeration cycle, a compression refrigeration cycle, and an integrated device for preparing desalinated salt proposed by the present invention to perform multi-effect cogeneration of cooling, electricity, and desalinated salt. The electric energy produced by the system can be used for partial self-power supply of the system to reduce power consumption, and the cold energy produced can be used for the preparation of desalinated salt and the drying and purification of hydrogen, thereby simplifying the process of hydrogen purification and electrolyte replenishment, reducing the overall cost of hydrogen production by electrolysis of water, and improving the efficiency of hydrogen production by electrolysis of seawater.

[0005] In the present invention, the desalinated salt refers to the system's co-products of salt and desalinated water.

[0006] A first aspect of the present invention provides an integrated device for preparing desalinated salt, which comprises an upper desalinated salt separation module and a lower condensation desalination module;

[0007] The upper desalinated salt separation module includes a seawater inlet 17-1, an ice crystal precipitation tank 17-2, an upper refrigerant inlet 17-3, a filter ice delivery pipe 17-4, a brine diversion tank 17-5, a concentrated brine outlet 17-6, a wall heat exchanger 17-12, an upper refrigerant outlet 17-13, an upper coil heat exchanger 17-14 and a support column;

[0008] The lower condensation and desalination module includes a fresh water outlet 17-7, an ice crystal melting tank 17-8, a lower refrigerant inlet 17-9, a lower coil heat exchanger 17-10 and a lower refrigerant outlet 17-11;

[0009] The seawater inlet 17-1 is installed at the top center of the desalinated salt preparation integrated device, the ice crystal precipitation tank 17-2 is installed directly below the seawater inlet, and is installed directly above the ice crystal melting tank 17-8 through the support column, and the ice crystal melting tank 17-8 is located at the bottom of the entire desalinated salt preparation integrated device; the wall heat exchanger 17-12 is installed on the outer wall of the ice crystal precipitation tank 17-2, the upper refrigerant inlet 17-3 is connected to one port of the wall heat exchanger 17-12, the other port of the wall heat exchanger 17-12 is connected to one port of the upper coil heat exchanger 17-14 in the ice crystal precipitation tank 17-2, and the other port of the upper coil heat exchanger 17-14 is connected to the upper refrigerant outlet 17-13;

[0010] The filtering ice delivery pipe 17-4 is arranged on the open side of the ice crystal precipitation tank 17-2, and the outlet of the filtering ice delivery pipe 17-4 is connected to the ice crystal precipitation tank 17-2, and the brine guide tank 17-5 is arranged below the filtering ice crystal pipe 17-4; one port of the lower coil heat exchanger 17-10 installed in the ice crystal melting tank 17-8 is connected to the lower refrigerant inlet 17-9, and the other port of the lower coil heat exchanger 17-10 is connected to the lower refrigerant outlet 17-11; the concentrated brine outlet 17-6 and the fresh water outlet 17-7 are respectively installed on the side walls close to the ice crystal precipitation tank 17-2 and the ice crystal melting tank 17-8.

[0011] Preferably, the upper desalinated salt separation module and the lower condensation and desalination module are both cylindrical, and the integrated desalinated salt preparation device as a whole is a stack of two upper and lower cylinders.

[0012] Preferably, the filtering ice delivery pipe 17 - 4 is an insulated ice delivery pipe with filtering holes on one side, and the filtering ice delivery pipe 17 - 4 can be four or more symmetrically arranged.

[0013] The brine diversion trough 17-5 is a channel installed around the side wall of the ice crystal precipitation trough 17-2. The brine diversion trough 17-5 is provided with an outlet for collecting the brine obtained by filtration.

[0014] Preferably, the seawater inlet 17-1 needs to be installed at a certain height from the ice crystal precipitation tank 17-2, and use its potential energy to push the ice crystals to move to the filtering ice delivery pipe 17-4 around;

[0015] The wall heat exchanger 17 - 12 , the filtering ice delivery pipe 17 - 4 and the ice crystal melting tank 17 - 8 all need to be provided with additional insulation materials on their surfaces for insulation.

[0016] The second aspect of the present invention provides an integrated method for preparing desalted salt, using the integrated device for preparing desalted salt described in the first aspect of the present invention, which comprises the following steps:

[0017] Seawater enters the ice crystal precipitation tank 17-2 through the seawater inlet 17-1 until the tank is filled with seawater and the supply stops. The refrigerant of the absorption refrigeration subsystem enters the upper desalted salt separation module through the upper refrigerant inlet 17-3, and passes through the wall heat exchanger 17-12 and the upper coil heat exchanger 17-14 in turn for evaporative cooling, and finally flows out through the upper refrigerant outlet 17-13;

[0018] The seawater in the ice crystal precipitation tank 17-2 exchanges heat with the low-temperature refrigerant (accepts low temperature) and begins to freeze and precipitate freshwater ice crystals. The freshwater ice crystals float to the water surface due to their low density. At this time, the water level drops, and the gravity seawater tank 4 continues to introduce seawater into the ice crystal precipitation tank 17-2. Since the seawater inlet 17-1 is set at a certain distance from the water surface of the ice crystal precipitation tank 17-2, the impact of seawater on the center of the water surface will diffuse to the surroundings through the water flow and drive the ice crystals into the filtering ice delivery pipe 17-4;

[0019] The ice crystals carry part of the brine through the filtering and ice delivery pipe 17-4 to filter the brine and transport the ice crystals. The filtered brine flows through the filtering holes to the brine diversion groove 17-5 to be diverted and collected separately, and the ice crystals enter the ice crystal melting groove 17-8.

[0020] The refrigerant of the compression refrigeration sub-cycle enters the lower-stage condensation and desalination module through the lower-stage refrigerant inlet 17-9, exchanges heat with ice crystals and condenses through the lower-stage coil heat exchanger 17-10, and then flows out through the lower-stage refrigerant outlet 17-11. The ice crystals absorb heat and melt to generate fresh water, and the fresh water flows out through the fresh water outlet 17-7. Finally, as fresh water ice crystals are continuously precipitated, the seawater in the ice crystal precipitation tank 17-2 is continuously concentrated, and flows out through the concentrated brine outlet 17-6 to be collected for salt preparation.

[0021] The third aspect of the present invention provides an electrolytic cell waste heat cooling and electricity desalination salt cogeneration system, which includes a power module, a cascade refrigeration module, a desalination salt preparation module and a hydrogen purification module; the desalination salt preparation module includes the desalination salt preparation integrated device 17 described in the first aspect of the present invention.

[0022] Preferably, the hydrogen purification module comprises an electrolyzer 1, an evaporator 7, a gas-liquid separator 3, a hydrogen purification processor 5 and a hydrogen dryer 6, wherein the electrolyte outlet of the electrolyzer 1 is connected to the electrolyte side inlet of the evaporator 7, the electrolyte outlet of the evaporator 7 is connected to the inlet of the gas-liquid separator 3, the fluid outlet of the gas-liquid separator 3 is connected to the inlet of the electrolyzer 1, the vapor outlet of the gas-liquid separator 3 is connected to the inlet of the hydrogen purification processor 5, and the outlet of the hydrogen purification processor 5 is connected to the inlet of the hydrogen dryer 6;

[0023] The cascade refrigeration module includes an absorption refrigeration submodule and a compression refrigeration submodule, wherein the absorption refrigeration submodule includes a condensation generator 11, a condenser 14, an upper throttle valve 15, an absorber 13 and a circulating pump 12, the mixed working medium side steam outlet of the condensation generator 11 is connected to the inlet of the condenser 14, the outlet of the condenser 14 is connected to the inlet of the upper throttle valve 15, the outlet of the upper throttle valve 15 is connected to the upper refrigerant inlet 17-3 of the desalinated salt preparation integrated device 17, the upper refrigerant outlet 17-13 of the desalinated salt preparation integrated device 17 is connected to the inlet of the absorber 13, the outlet of the absorber 13 is connected to the inlet of the circulating pump 12, and the outlet of the circulating pump 12 is connected to the condensation generator 11 is connected to the mixed working fluid side inlet, the mixed working fluid side fluid outlet of the condensing generator 11 is connected to the nozzle inlet of the absorber 13; the compression refrigeration submodule includes a lower-level throttle valve 20 and a compressor 19, the lower-level refrigerant outlet 17-11 of the desalinated salt preparation integrated device 17 is connected to the inlet of the lower-level throttle valve 20, the outlet of the lower-level throttle valve 20 is connected to the refrigerant side inlet of the hydrogen dryer 6, the refrigerant side outlet of the hydrogen dryer 6 is connected to the inlet of the compressor 19, and the outlet of the compressor 19 is connected to the lower-level refrigerant inlet 17-9 of the desalinated salt preparation integrated device 17; the absorption refrigeration submodule and the compression refrigeration submodule are coupled into a cascade refrigeration module through the desalinated salt preparation integrated device 17;

[0024] The desalinated salt refrigeration module includes a desalinated salt preparation integrated device 17, a concentrated brine collection tank 16, a gravity seawater tank 4 and a fresh water pump 18, wherein the concentrated brine outlet 17-6 of the desalinated salt preparation integrated device 17 is connected to the concentrated brine collection tank 16, the seawater inlet 17-1 is connected to the gravity seawater tank 4, the fresh water outlet 17-7 is connected to the inlet of the fresh water pump 18, and the outlet of the fresh water pump 18 is connected to the fresh water replenishment port of the gas-liquid separator 3;

[0025] The power module includes an expander 8, a generator 9 and a working fluid pump 10. The working fluid side outlet of the evaporator 7 is connected to the inlet of the expander 8, the expander 8 is connected to the generator 9 through a rotating shaft, the expander 8 outlet is connected to the working fluid side inlet of the condensation generator 11, the working fluid side outlet of the condensation generator 11 is connected to the inlet of the working fluid pump 10, and the working fluid pump 10 outlet is connected to the working fluid side inlet of the evaporator 7; the power module is coupled to the hydrogen purification module through the evaporator 7, and is coupled to the cascade refrigeration module through the condensation generator 11; the generator 9 is respectively connected to the working fluid pump 10, the supplementary pump 2, the fresh water pump 18 and the circulating pump 12 through wires.

[0026] Preferably, the gravity seawater tank 4 is replenished with seawater from the sea by a pump, and a valve is provided at the outlet of the gravity seawater tank 4 to control the switch and flow rate.

[0027] Preferably, according to the power generation capacity of the power module, the electrolytic cell waste heat cooling and electricity desalination salt cogeneration system can be fully or partially self-sufficient.

[0028] The fourth aspect of the present invention provides a method for co-producing electrolytic cell waste heat, cooling, electricity and desalinated salt, using the electrolytic cell waste heat, cooling, electricity and desalinated salt co-production system according to the third aspect of the present invention, which comprises the following steps:

[0029] The electrolyzer 1 electrolyzes seawater to produce hydrogen, and the generated high-temperature electrolyte passes through the evaporator 7 as a heat source for the power cycle to provide heat energy, and then undergoes gas-liquid separation in the gas-liquid separator 3, and the separated hydrogen enters the hydrogen purification processor 5 for purification treatment, and finally undergoes freeze drying in the hydrogen dryer 6 for further purification, and finally obtains purified hydrogen;

[0030] In the power cycle, after the organic working fluid is pressurized by the working fluid pump 10, it absorbs heat and evaporates in the evaporator 7 to generate high-temperature and high-pressure steam. The high-temperature and high-pressure steam then enters the expander 8 to perform work. The expander 8 performs work and drives the generator 9 to generate electricity through the rotating shaft. The generator 9 provides electrical energy to the working fluid pump 10, the supplementary pump 2, the fresh water pump 18 and the circulating pump 12 through electric wires. The exhaust gas at the outlet of the expander 8 still has a certain temperature. The condensation generator 11 provides heat energy to the absorption refrigeration submodule of the cascade refrigeration module and makes the working fluid of the power module self-condense. Finally, the working fluid pump 10 is pressurized to perform the next cycle.

[0031] In the cascade refrigeration module, the mixed working medium of the absorption refrigeration submodule is transported from the absorber 13 to the condensation generator 11 through the circulating pump 12 for evaporation and separation. After the steam working medium leaves the condensation generator 11, it enters the condenser 14 for condensation, and then throttles, expands and cools through the upper throttle valve 15 to become a cooled working medium (low-temperature working medium). The cooled working medium enters the desalinated salt preparation integrated device 17 through the upper refrigerant inlet 17-3, and successively passes through the wall heat exchanger 17-12 and the upper coil heat exchanger 17-14 to freeze and refrigerate the seawater in the ice crystal precipitation tank 17-2, and finally flows out through the upper refrigerant outlet 17-13 and returns to the absorber 13. At the same time, the absorbent in the condensation generator 11 passes through the upper refrigerant inlet 17-3. The refrigerant passes through the absorber 13 nozzle inlet and returns to the absorber 13 to re-form a mixed working fluid with the solute; in the compression refrigeration submodule, the refrigerant is pressurized by the compressor 19 and enters the desalinated salt preparation integrated device 17 through the lower refrigerant inlet 17-9 of the desalinated salt preparation integrated device 17, and condenses and releases heat by using the ice crystals in the ice crystal melting tank 17-8 through the lower coil heat exchanger 17-10, and finally flows out through the lower refrigerant outlet 17-11, and then throttles through the lower throttle valve 20 to expand and cool down to become a low-temperature refrigerant. The low-temperature refrigerant enters the hydrogen dryer 6 for evaporative refrigeration, so that the hydrogen reaches the dew point temperature, freezes the water in the hydrogen, dries the hydrogen, and finally returns to the compressor 19 for pressurization to enter the next cycle;

[0032] In the desalinated salt preparation module, seawater is added to the ice crystal precipitation tank 17-2 through the gravity seawater tank 4, and the absorption refrigeration submodule freezes the seawater to precipitate freshwater ice crystals, which are sent to the ice crystal melting tank 17-8 through the filtering ice delivery pipe 17-4. The filtering ice delivery pipe 17-4 filters most of the brine entrained by the ice crystals, and diverts and collects them through the brine diversion tank 17-5. The ice crystals melt in the ice crystal melting tank 17-8 and absorb heat for condensation in the compression refrigeration subcycle, generating fresh water at the same time. The fresh water is supplied to the gas-liquid separator 3 through the fresh water pump 18, and finally the concentrated brine in the ice crystal precipitation tank 17-2 is collected by the concentrated brine collection tank 16 for preparing salt;

[0033] In the hydrogen purification module, the electrolyte after the electrolyzer 1 electrolyzes seawater to produce hydrogen is entrained with impure hydrogen and dissipated through the evaporator 7, and then enters the gas-liquid separator 3 for gas-liquid separation. The separated impure hydrogen first enters the hydrogen purification processor 5 for purification to remove most of the impurities, and then enters the hydrogen dryer 6 for low-temperature freeze-drying and purification using a compression refrigeration sub-cycle to obtain purified hydrogen. Finally, the concentrated electrolyte in the gas-liquid separator 3 is supplemented with fresh water produced by the salt preparation module, and then supplied to the electrolyzer 1 through the supplementary pump 2. At this point, the whole system completes the multi-effect cogeneration and hydrogen purification driven by the remaining heat.

[0034] In the present invention, light and concentrated refer to the initial light salt concentration.

[0035] Compared with the existing technology, the beneficial effects of the present invention are as follows: the integrated device for preparing desalinated salt and the electrolytic cell waste heat cold electricity desalinated salt cogeneration system proposed by the present invention can prepare desalinated salt by freezing desalination, simplifying the electrolyte replenishment process and cost. The electrolytic cell waste heat cold electricity desalinated salt cogeneration system can use the waste heat of seawater electrolysis to drive the system to produce hydrogen through coupling and linkage between different modules to produce multiple effects and purify hydrogen, thereby simplifying the hydrogen purification process and reducing the overall cost of seawater electrolysis to produce hydrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the integrated device for preparing desalinated salt according to the present invention;

[0037] The accompanying drawings are described as follows: seawater inlet 17-1, ice crystal precipitation tank 17-2, upper refrigerant inlet 17-3, filtered ice delivery pipe 17-4, brine diversion tank 17-5, concentrated brine outlet 17-6, fresh water outlet 17-7, ice crystal melting tank 17-8, lower refrigerant inlet 17-9, lower coil heat exchanger 17-10, lower refrigerant outlet 17-11, wall heat exchanger 17-12, upper refrigerant outlet 17-13, upper coil heat exchanger 17-14.

[0038] Figure 2 This is a schematic diagram of the structure of the electrolytic cell waste heat cooling electricity and desalinated salt cogeneration system of the present invention;

[0039] The accompanying drawings are described as follows: electrolytic cell 1, replenishing pump 2, gas-liquid separator 3, gravity seawater tank 4, hydrogen purification processor 5, hydrogen dryer 6, evaporator 7, expander 8, generator 9, working fluid pump 10, condensation generator 11, circulation pump 12, absorber 13, condenser 14, upper throttle valve 15, brine collection tank 16, desalinated salt preparation integrated device 17, fresh water pump 18, compressor 19, lower throttle valve 20. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with embodiments.

[0041] Those skilled in the art will appreciate that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0042] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0043] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0045] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0046] Example

[0047] Combine the following Figure 1 and Figure 2 A specific implementation scheme is proposed for the present invention:

[0048] The present invention provides an integrated device for preparing desalinated salt and an electrolytic cell waste heat cooling and electricity desalinated salt cogeneration system, wherein the integrated device for preparing desalinated salt 17 includes an upper desalinated salt separation module and a lower condensation desalination module. The upper desalinated salt separation module includes a seawater inlet 17-1, an ice crystal precipitation tank 17-2, an upper refrigerant inlet 17-3, a filtering ice delivery pipe 17-4, a brine diversion tank 17-5, a concentrated brine outlet 17-6, a wall heat exchanger 17-12, an upper refrigerant outlet 17-13, an upper coil-type heat exchanger 17-14 and a support column, and the lower condensation desalination module includes a fresh water outlet 17-7, an ice crystal melting tank 17-8, a lower refrigerant inlet 17-9, a lower coil-type heat exchanger 17-10 and a lower refrigerant outlet 17-11; the device as a whole is an upper desalinated salt separation module and a lower The stack of condensation and desalination modules (two cylinders) is characterized in that the seawater inlet 17-1 is installed at the top center of the device, the ice crystal precipitation tank 17-2 is installed directly below the seawater inlet, and is installed directly above the ice crystal melting tank 17-8 through the support column, and the ice crystal melting tank 17-8 is located at the bottom of the entire device; the wall heat exchanger 17-12 is installed on the outer wall of the ice crystal precipitation tank 17-2, the upper refrigerant inlet 17-3 is connected to one port of the wall heat exchanger 17-12, and the other port of the wall heat exchanger 17-12 is connected to the ice crystal precipitation tank 17-2. The upper coil heat exchanger 17-14 in the tank 17-2 is connected to one port of the upper coil heat exchanger 17-14, and the other port of the upper coil heat exchanger 17-14 is connected to the upper refrigerant outlet 17-13; four symmetrically arranged filtering ice delivery pipes 17-4 are arranged on the opening side of the ice crystal precipitation tank 17-2, and the filtering ice delivery pipe 17-4 is an insulated ice delivery pipe with a filtering hole on one side, and the outlet of the filtering ice delivery pipe 17-4 is connected to the ice crystal precipitation tank 17-2, and the brine diversion tank 17-5 is arranged below the filtering ice crystal pipe 17-4, and the brine diversion tank 17-5 In order to surround the channel installed on the side wall of the ice crystal precipitation tank 17-2, the brine diversion tank 17-5 is provided with an outlet for collecting the brine obtained by filtration; one port of the lower-level coil-type heat exchanger 17-10 installed in the ice crystal melting tank 17-8 is connected to the lower-level refrigerant inlet 17-9, and the other port of the lower-level coil-type heat exchanger 17-10 is connected to the lower-level refrigerant outlet 17-11; the concentrated brine outlet 17-6 and the fresh water outlet 17-7 are respectively installed on the side walls close to the ice crystal precipitation tank 17-2 and the ice crystal melting tank 17-8.

[0049] Furthermore, the seawater inlet 17-1 needs to be installed at a certain height from the ice crystal precipitation tank 17-2, so as to use its potential energy to push the ice crystals to move toward the filtering and ice-delivering pipes 17-4 around it.

[0050] Furthermore, at the locations where heat preservation treatment is required: the wall heat exchanger 17-12, the filtering ice delivery pipe 17-4 and the ice crystal melting tank 17-8 all need to be provided with additional heat preservation materials on their surfaces for heat preservation.

[0051] A specific implementation of the electrolytic cell waste heat cooling and electricity desalination salt cogeneration system provided by the present invention is as follows:

[0052] The electrolytic cell waste heat cooling and electricity desalination salt cogeneration system includes a power module, a cascade refrigeration module, a desalination salt preparation module and a hydrogen purification module. The power module includes an expander 8, a generator 9 and a working fluid pump 10. The working fluid side outlet of the evaporator 7 is connected to the inlet of the expander 8. The expander 8 is connected to the generator 9 through a rotating shaft. The expander 8 outlet is connected to the working fluid side inlet of the condensation generator 11. The working fluid side outlet of the condensation generator 11 is connected to the inlet of the working fluid pump 10. The working fluid pump 10 outlet is connected to the working fluid side inlet of the evaporator 7; the power module is coupled to the hydrogen purification module through the evaporator 7, and is coupled to the cascade refrigeration module through the condensation generator 11; the generator 9 is respectively connected to the working fluid pump 10, the supplementary pump 2, the fresh water pump 18 and the circulating pump 12 through electric wires. The cascade refrigeration module includes an absorption refrigeration submodule and a compression refrigeration submodule, wherein the absorption refrigeration submodule includes a condensation generator 11, a condenser 14, an upper throttle valve 15, an absorber 13 and a circulating pump 12, the mixed working medium side steam outlet of the condensation generator 11 is connected to the inlet of the condenser 14, the outlet of the condenser 14 is connected to the inlet of the upper throttle valve 15, the outlet of the upper throttle valve 15 is connected to the upper refrigerant inlet 17-3 of the desalinated salt preparation integrated device 17, the upper refrigerant outlet 17-13 of the desalinated salt preparation integrated device 17 is connected to the inlet of the absorber 13, the outlet of the absorber 13 is connected to the inlet of the circulating pump 12, and the outlet of the circulating pump 12 is connected to the condensation generator 11 is connected to the mixed working fluid side inlet, and the mixed working fluid side fluid outlet of the condensing generator 11 is connected to the nozzle inlet of the absorber 13; the compression refrigeration submodule includes a lower-level throttle valve 20 and a compressor 19, the lower-level refrigerant outlet 17-11 of the desalinated salt preparation integrated device 17 is connected to the inlet of the lower-level throttle valve 20, the outlet of the lower-level throttle valve 20 is connected to the refrigerant side inlet of the hydrogen dryer 6, the refrigerant side outlet of the hydrogen dryer 6 is connected to the inlet of the compressor 19, and the outlet of the compressor 19 is connected to the lower-level refrigerant inlet 17-9 of the desalinated salt preparation integrated device 17; the absorption refrigeration submodule and the compression refrigeration submodule are coupled into a cascade refrigeration module through the desalinated salt preparation integrated device 17. The desalinated salt refrigeration module includes an integrated desalinated salt preparation device 17, a concentrated brine collection tank 16, a gravity seawater tank 4 and a fresh water pump 18. The concentrated brine outlet 17-6 of the integrated desalinated salt preparation device 17 is connected to the concentrated brine collection tank 16, the seawater inlet 17-1 is connected to the gravity seawater tank 4, the fresh water outlet 17-7 is connected to the inlet of the fresh water pump 18, and the outlet of the fresh water pump 18 is connected to the fresh water replenishment port of the gas-liquid separator 3; the hydrogen purification module includes an electrolyzer 1, an evaporator 7, a gas-liquid separator 3, the hydrogen purification processor 5 and a hydrogen dryer 6.The electrolyte outlet of the electrolytic cell 1 is connected to the electrolyte side inlet of the evaporator 7, the electrolyte outlet of the evaporator 7 is connected to the inlet of the gas-liquid separator 3, the fluid outlet of the gas-liquid separator 3 is connected to the inlet of the electrolytic cell 1, the steam outlet of the gas-liquid separator 3 is connected to the inlet of the hydrogen purification processor 5, and the outlet of the hydrogen purification processor 5 is connected to the inlet of the hydrogen dryer 6.

[0053] It should also be noted that the gravity seawater tank 4 is replenished with seawater from the sea through a pump, and the outlet of the gravity seawater tank 4 should be equipped with a valve to control the switch and flow rate.

[0054] Furthermore, depending on the amount of power generated by the power module, the system can be self-sufficient in whole or in part.

[0055] Based on the above structural relationship, the power module, the cascade refrigeration module, the hydrogen purification module and the desalinated salt preparation module with the desalinated salt preparation integrated device as the core cooperate with each other to form a desalinated salt preparation integrated device and an electrolytic cell waste heat utilization cold electricity desalinated salt multi-effect cogeneration system proposed by the present invention.

[0056] Combination Figure 1 The working principle of the device of the present invention is described as follows:

[0057] Seawater enters the ice crystal precipitation tank 17-2 through the seawater inlet 17-1 until the tank is filled with seawater and the supply is stopped. The refrigerant of the absorption refrigeration subsystem enters the upper desalted salt separation module through the upper refrigerant inlet 17-3, and is successively subjected to evaporative cooling through the wall heat exchanger 17-12 and the upper coil heat exchanger 17-14, and finally flows out through the upper refrigerant outlet 17-13; the seawater in the ice crystal precipitation tank 17-2 exchanges heat with the low-temperature refrigerant (accepts low temperature) and begins to freeze and precipitate freshwater ice crystals. The freshwater ice crystals float to the water surface due to their low density. At this time, the water surface drops, and the gravity seawater tank 4 continues to introduce seawater into the ice crystal precipitation tank 17-2. Since the seawater inlet 17-1 is set at a height a certain distance from the water surface of the ice crystal precipitation tank 17-2, the impact of seawater on the center of the water surface will pass through the water The flow spreads around and drives the ice crystals into the filtering ice delivery pipe 17-4; the ice crystals carry part of the brine through the filtering ice delivery pipe 17-4 to filter the brine and transport the ice crystals, and the filtered brine flows through the filter holes to the brine diversion groove 17-5 to be diverted and collected separately, and the ice crystals enter the ice crystal melting groove 17-8; the refrigerant of the compression refrigeration sub-cycle enters the lower condensation and desalination module through the lower refrigerant inlet 17-9, exchanges heat with the ice crystals through the lower coil heat exchanger 17-10, and then flows out through the lower refrigerant outlet 17-11, and the ice crystals absorb heat and melt to generate fresh water, which flows out through the fresh water outlet 17-7. Finally, with the continuous precipitation of fresh water ice crystals, the seawater in the ice crystal precipitation groove 17-2 is continuously concentrated, and flows out through the concentrated brine outlet 17-6 for collection for salt preparation.

[0058] Combination Figure 1 and Figure 2 The working principle of the system of the present invention is described as follows:

[0059] The electrolyzer 1 electrolyzes seawater to produce hydrogen, and the high-temperature electrolyte produced passes through the evaporator 7 as a heat source for the power cycle to provide heat energy, and then undergoes gas-liquid separation in the gas-liquid separator 3, and the separated hydrogen enters the hydrogen purification processor 5 for purification treatment, and finally is further purified by freeze drying in the hydrogen dryer 6 to finally obtain purified hydrogen. In the power cycle, after the organic working fluid is pressurized by the working fluid pump 10, it absorbs heat and evaporates in the evaporator 7 to generate high-temperature and high-pressure steam, and the high-temperature and high-pressure steam then enters the expander 8 to perform work, and the expander 8 performs work and drives the generator 9 to generate electricity through the rotating shaft, and the generator 9 provides electrical energy to the working fluid pump 10, the supplementary pump 2, the fresh water pump 18 and the circulating pump 12 through electric wires, and the exhaust gas at the outlet of the expander 8 still has a certain temperature, and provides heat energy to the absorption refrigeration submodule of the cascade refrigeration module through the condensation generator 11, while causing the working fluid of the power module to self-condense, and finally pressurizes the working fluid pump 10 for the next cycle. In the cascade refrigeration module, the mixed working medium of the absorption refrigeration submodule is transported from the absorber 13 to the condensation generator 11 through the circulation pump 12 for evaporation and separation. After the steam working medium leaves the condensation generator 11, it enters the condenser 14 for condensation, and then throttles, expands and cools down through the upper throttle valve 15 to become a low-temperature working medium. The low-temperature working medium enters the desalinated salt preparation integrated device 17 through the upper refrigerant inlet 17-3, and successively passes through the wall heat exchanger 17-12 and the upper coil heat exchanger 17-14 to freeze and refrigerate the seawater in the ice crystal precipitation tank 17-2, and finally flows out through the upper refrigerant outlet 17-13 and returns to the absorber 13. At the same time, the absorbent in the condensation generator 11 passes through the absorption The nozzle inlet of the collector 13 returns to the absorber 13 to re-form a mixed working fluid with the solute; in the compression refrigeration sub-module, the refrigerant is pressurized by the compressor 19 and enters the desalinated salt preparation integrated device 17 through the lower refrigerant inlet 17-9 of the desalinated salt preparation integrated device 17, and condenses and releases heat by using the ice crystals in the ice crystal melting tank 17-8 through the lower coil heat exchanger 17-10, and finally flows out through the lower refrigerant outlet 17-11, and then throttles through the lower throttle valve 20 to expand and cool down to become a low-temperature refrigerant. The low-temperature refrigerant enters the hydrogen dryer 6 for evaporative refrigeration, so that the hydrogen reaches the dew point temperature, freezes the water in the hydrogen, dries the hydrogen, and finally returns to the compressor 19 for pressurization to enter the next cycle.In the desalinated salt preparation module, seawater is replenished into the ice crystal precipitation tank 17-2 through the gravity seawater tank 4, and the absorption refrigeration submodule freezes the seawater to precipitate freshwater ice crystals. The freshwater ice crystals are sent to the ice crystal melting tank 17-8 through the filtering ice delivery pipe 17-4. The filtering ice delivery pipe 17-4 filters most of the brine entrained by the ice crystals, and diverts and collects it through the brine diversion tank 17-5. The ice crystals melt in the ice crystal melting tank 17-8 and absorb heat to condense for the compression refrigeration sub-cycle, while generating fresh water. The fresh water is supplied to the gas-liquid separator 3 through the fresh water pump 18. Finally, the concentrated brine in the ice crystal precipitation tank 17-2 is collected by the concentrated brine collection tank 16 for preparing salt. In the hydrogen purification module, the electrolyte after the electrolyzer 1 electrolyzes seawater to produce hydrogen is entrained with impure hydrogen and dissipated through the evaporator 7, and then enters the gas-liquid separator 3 for gas-liquid separation. The separated impure hydrogen first enters the hydrogen purification processor 5 for purification to remove most of the impurities, and then enters the hydrogen dryer 6 for low-temperature freeze-drying and purification using a compression refrigeration sub-cycle to obtain purified hydrogen. Finally, the concentrated electrolyte in the gas-liquid separator 3 is supplemented with fresh water produced by the salt preparation module, and then supplied to the electrolyzer 1 through the supplementary pump 2. At this point, the whole system completes the multi-effect cogeneration and hydrogen purification driven by the remaining heat.

Claims

1. An integrated device for preparing desalinated salt, characterized in that: It includes an upper desalinated salt separation module and a lower condensation desalination module; The upper desalinated salt separation module comprises a seawater inlet (17-1), an ice crystal precipitation tank (17-2), an upper refrigerant inlet (17-3), a filtering ice delivery pipe (17-4), a brine diversion tank (17-5), a concentrated brine outlet (17-6), a wall heat exchanger (17-12), an upper refrigerant outlet (17-13), an upper coil heat exchanger (17-14) and a support column; The lower-stage condensation and desalination module comprises a fresh water outlet (17-7), an ice crystal melting tank (17-8), a lower-stage refrigerant inlet (17-9), a lower-stage coil heat exchanger (17-10) and a lower-stage refrigerant outlet (17-11); The seawater inlet (17-1) is installed at the top center of the desalinated salt preparation integrated device, the ice crystal precipitation tank (17-2) is installed directly below the seawater inlet, and is installed directly above the ice crystal melting tank (17-8) through the support column, and the ice crystal melting tank (17-8) is located at the bottom of the entire desalinated salt preparation integrated device; the wall heat exchanger (17-12) is installed on the outer wall of the ice crystal precipitation tank (17-2), the upper refrigerant inlet (17-3) is connected to one port of the wall heat exchanger (17-12), the other port of the wall heat exchanger (17-12) is connected to one port of the upper coil heat exchanger (17-14) in the ice crystal precipitation tank (17-2), and the other port of the upper coil heat exchanger (17-14) is connected to the upper refrigerant outlet (17-13); The filtering ice delivery pipe (17-4) is arranged on the open side of the ice crystal precipitation tank (17-2); the outlet of the filtering ice delivery pipe (17-4) is connected to the ice crystal precipitation tank (17-2); the brine guide tank (17-5) is arranged below the filtering ice crystal pipe 17-4; one port of the lower coil heat exchanger (17-10) installed in the ice crystal melting tank (17-8) is connected to the lower refrigerant inlet 17-9, and the other port of the lower coil heat exchanger (17-10) is connected to the lower refrigerant outlet (17-11); the concentrated brine outlet (17-6) and the fresh water outlet (17-7) are respectively installed on the side walls close to the ice crystal precipitation tank (17-2) and the ice crystal melting tank (17-8).

2. The integrated device for preparing desalinated salt according to claim 1, characterized in that: The upper desalinated salt separation module and the lower condensation and desalination module are both cylindrical, and the desalinated salt preparation integrated device as a whole is a stack of two upper and lower cylinders.

3. The integrated device for preparing desalinated salt according to claim 1, characterized in that: The filtering ice delivery pipe (17-4) is a heat-insulating ice delivery pipe with filtering holes provided on one side. The filtering ice delivery pipe (17-4) is four or more symmetrically arranged. The brine diversion trough (17-5) is a channel installed around the side wall of the ice crystal precipitation trough (17-2), and the brine diversion trough (17-5) is provided with an outlet for collecting brine obtained by filtration.

4. The integrated device for preparing desalinated salt according to claim 1, characterized in that: The seawater inlet (17-1) needs to be installed at a certain height from the ice crystal precipitation tank (17-2), and utilizes its potential energy to push ice crystals to move toward the filtering and ice delivery pipes (17-4) around it; The wall-type heat exchanger (17-12), the filtering ice delivery pipe (17-4) and the ice crystal melting tank (17-8) all need to be provided with additional insulation materials on their surfaces for insulation.

5. An integrated method for preparing desalinated salt, characterized in that: The integrated device for preparing desalinated salt according to any one of claims 1 to 4 comprises the following steps: Seawater enters the ice crystal precipitation tank (17-2) through the seawater inlet (17-1) until the tank is filled with seawater and the supply is stopped; the refrigerant of the absorption refrigeration subsystem enters the upper desalinated salt separation module through the upper refrigerant inlet (17-3), and sequentially passes through the wall heat exchanger (17-12) and the upper coil heat exchanger (17-14) for evaporative cooling, and finally flows out through the upper refrigerant outlet (17-13); The seawater in the ice crystal precipitation tank (17-2) exchanges heat with the low-temperature refrigerant to begin freezing and precipitating freshwater ice crystals, and the freshwater ice crystals float to the water surface. At this time, the water level drops, and seawater is continuously introduced into the ice crystal precipitation tank (17-2). The impact of the seawater on the center of the water surface will diffuse to the surroundings through the water flow and drive the ice crystals into the filtering ice delivery pipe (17-4); The ice crystals carry part of the brine through the filtering and ice-feeding pipe (17-4) to filter the brine and transport the ice crystals. The brine obtained by filtration flows to the brine diversion groove (17-5) to be diverted and collected separately, and the ice crystals enter the ice crystal melting groove (17-8); The refrigerant of the compression refrigeration sub-cycle enters the lower-stage condensation and desalination module through the lower-stage refrigerant inlet (17-9), exchanges heat with ice crystals for condensation through the lower-stage coil heat exchanger (17-10), and then flows out through the lower-stage refrigerant outlet (17-11). The ice crystals absorb heat and melt to generate fresh water, which flows out through the fresh water outlet (17-7). Finally, as fresh water ice crystals are continuously precipitated, the seawater in the ice crystal precipitation tank (17-2) is continuously concentrated, and flows out through the concentrated brine outlet (17-6) for collection.

6. An electrolytic cell waste heat cooling and electricity desalination salt cogeneration system, characterized in that: It comprises a power module, a cascade refrigeration module, a desalinated salt preparation module and a hydrogen purification module; the desalinated salt preparation module comprises the desalinated salt preparation integrated device (17) as described in any one of claims 1 to 4.

7. The electrolytic cell waste heat cooling and electricity desalination salt cogeneration system according to claim 6, characterized in that: The hydrogen purification module comprises an electrolytic cell (1), an evaporator (7), a gas-liquid separator (3), the hydrogen purification processor (5) and a hydrogen dryer (6), wherein the electrolyte outlet of the electrolytic cell (1) is connected to the electrolyte side inlet of the evaporator (7), the electrolyte outlet of the evaporator (7) is connected to the inlet of the gas-liquid separator (3), the fluid outlet of the gas-liquid separator (3) is connected to the inlet of the electrolytic cell (1), the steam outlet of the gas-liquid separator (3) is connected to the inlet of the hydrogen purification processor (5), and the outlet of the hydrogen purification processor (5) is connected to the inlet of the hydrogen dryer (6); The cascade refrigeration module comprises an absorption refrigeration submodule and a compression refrigeration submodule, wherein the absorption refrigeration submodule comprises a condensation generator (11), a condenser (14), an upper throttle valve (15), an absorber (13) and a circulation pump (12); a mixed working medium side steam outlet of the condensation generator (11) is connected to an inlet of the condenser (14); an outlet of the condenser (14) is connected to an inlet of the upper throttle valve (15); an outlet of the upper throttle valve (15) is connected to an upper refrigerant inlet (17-3) of the desalinated salt preparation integrated device (17); an upper refrigerant outlet (17-13) of the desalinated salt preparation integrated device (17) is connected to an inlet of the absorber (13); an outlet of the absorber (13) is connected to an inlet of the circulation pump (12); an outlet of the circulation pump (12) is connected to an outlet of the condensation generator (11); The mixed working fluid side inlet of the condensing generator (11) is connected, and the mixed working fluid side fluid outlet of the condensing generator (11) is connected to the nozzle inlet of the absorber (13); the compression refrigeration submodule comprises a lower-level throttle valve (20) and a compressor (19); the lower-level refrigerant outlet (17-11) of the desalinated salt preparation integrated device (17) is connected to the inlet of the lower-level throttle valve (20); the outlet of the lower-level throttle valve (20) is connected to the refrigerant side inlet of the hydrogen dryer (6); the refrigerant side outlet of the hydrogen dryer (6) is connected to the inlet of the compressor (19); the outlet of the compressor (19) is connected to the lower-level refrigerant inlet (17-9) of the desalinated salt preparation integrated device (17); the absorption refrigeration submodule and the compression refrigeration submodule are coupled to form a cascade refrigeration module through the desalinated salt preparation integrated device (17); The desalinated salt refrigeration module comprises the desalinated salt preparation integrated device (17), a concentrated salt water collection tank (16), a gravity seawater tank (4) and a fresh water pump (18); the concentrated salt water outlet (17-6) of the desalinated salt preparation integrated device (17) is connected to the concentrated salt water collection tank (16), the seawater inlet (17-1) is connected to the gravity seawater tank (4), the fresh water outlet (17-7) is connected to the inlet of the fresh water pump (18), and the outlet of the fresh water pump (18) is connected to the fresh water replenishment port of the gas-liquid separator (3); The power module comprises an expander (8), a generator (9) and a working fluid pump (10); the working fluid side outlet of the evaporator (7) is connected to the inlet of the expander (8); the expander (8) is connected to the generator (9) via a rotating shaft; the expander (8) outlet is connected to the working fluid side inlet of the condensation generator (11); the working fluid side outlet of the condensation generator (11) is connected to the inlet of the working fluid pump (10); the working fluid pump (10) outlet is connected to the working fluid side inlet of the evaporator (7); the power module is coupled to a hydrogen purification module via the evaporator (7) and is coupled to a cascade refrigeration module via the condensation generator (11); the generator (9) is respectively connected to the working fluid pump (10), a supplementary pump (2), a fresh water pump (18) and a circulating pump (12) via electric wires.

8. The electrolytic cell waste heat cooling and electricity desalination salt cogeneration system according to claim 7, characterized in that: The gravity seawater tank (4) is replenished with seawater from the sea by means of a pump, and a valve is provided at the outlet of the gravity seawater tank (4) to control the switch and flow rate.

9. The electrolytic cell waste heat cooling and electricity desalination salt cogeneration system according to claim 7, characterized in that: According to the power generation capacity of the power module, the electrolytic cell waste heat, cooling, electricity and desalination salt cogeneration system can be fully or partially self-sufficient.

10. A method for co-producing cold electricity and desalinated salt from electrolytic cell waste heat, characterized in that: The electrolytic cell waste heat cooling and electricity desalination salt cogeneration system according to any one of claims 7 to 9 comprises the following steps: The electrolytic cell (1) electrolyzes seawater to produce hydrogen, and the generated electrolyte passes through the evaporator (7) as a heat source for the power cycle to provide heat energy, and then undergoes gas-liquid separation in the gas-liquid separator (3), and the separated hydrogen enters the hydrogen purification processor (5) for purification, and finally is further purified by freeze drying in the hydrogen dryer (6) to obtain purified hydrogen; In the power cycle, after the organic working fluid is pressurized by the working fluid pump (10), it absorbs heat and evaporates in the evaporator (7) to generate steam, and the steam then enters the expander (8) to perform work. The expander (8) performs work and drives the generator (9) to generate electricity through the rotating shaft. The generator (9) provides electrical energy to the working fluid pump (10), the supplementary pump (2), the fresh water pump (18) and the circulating pump (12) through electric wires. The exhaust gas at the outlet of the expander (8) has a temperature, and provides heat energy to the absorption refrigeration submodule of the cascade refrigeration module through the condensation generator (11) while causing the working fluid of the power module to self-condense. Finally, the working fluid pump (10) is pressurized to perform the next cycle. In the cascade refrigeration module, the mixed working medium of the absorption refrigeration submodule is transported from the absorber (13) to the condensation generator (11) through the circulation pump (12) for evaporation and separation. After the steam working medium leaves the condensation generator (11), it enters the condenser (14) for condensation, and then throttles and expands through the upper throttle valve (15) to become a cooled working medium. The cooled working medium enters the desalinated salt preparation integrated device (17) through the upper refrigerant inlet (17-3), passes through the wall heat exchanger (17-12) and the upper coil heat exchanger (17-14) in sequence to freeze and refrigerate the seawater in the ice crystal precipitation tank (17-2), and finally flows out through the upper refrigerant outlet (17-13) and returns to the absorber (13). At the same time, the condensation generator (11) The absorbent in the absorber (13) returns to the absorber (13) through the nozzle inlet of the absorber (13) to re-form a mixed working fluid with the solute; in the compression refrigeration submodule, the refrigerant is pressurized by the compressor (19) and enters the desalinated salt preparation integrated device (17) through the lower refrigerant inlet (17-9) of the desalinated salt preparation integrated device (17), and condenses and releases heat through the lower coil heat exchanger (17-10) using the ice crystals in the ice crystal melting tank (17-8), and finally flows out through the lower refrigerant outlet (17-11), and then throttles through the lower throttle valve (20) to expand and cool to become refrigerant, and the refrigerant enters the hydrogen dryer (6) for evaporative refrigeration, freezes the water in the hydrogen, dries the hydrogen, and finally returns to the compressor (19) for pressurization to enter the next cycle; In the desalinated salt preparation module, seawater is replenished into the ice crystal precipitation tank (17-2) through the gravity seawater tank (4), the absorption refrigeration submodule freezes the seawater to precipitate freshwater ice crystals, the freshwater ice crystals are sent to the ice crystal melting tank (17-8) through the filtering ice delivery pipe (17-4), the filtering ice delivery pipe (17-4) filters the brine entrained by the ice crystals, and diverts and collects it through the brine diversion tank (17-5), the ice crystals melt in the ice crystal melting tank (17-8) and absorb heat to condense in the compression refrigeration subcycle, and at the same time generate fresh water, the fresh water is replenished into the gas-liquid separator (3) through the fresh water pump (18), and finally the concentrated brine in the ice crystal precipitation tank (17-2) is collected through the concentrated brine collection tank (16) for preparing salt; In the hydrogen purification module, the electrolyte obtained after the electrolyzer (1) electrolyzes seawater to produce hydrogen carries impure hydrogen through the evaporator (7) for heat dissipation, and then enters the gas-liquid separator (3) for gas-liquid separation. The separated impure hydrogen first enters the hydrogen purification processor (5) for purification to remove impurities, and then enters the hydrogen dryer (6) for low-temperature freeze-drying and purification using a compression refrigeration sub-cycle to obtain purified hydrogen. Finally, the concentrated electrolyte in the gas-liquid separator (3) is supplemented with fresh water produced by the salt preparation module, and then supplied to the electrolyzer (1) through the supplementary pump (2).

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