Wastewater hydrogen production system based on phase separation

Abstract

The utility model discloses a waste water hydrogen production system based on phase separation, which belongs to the field of electrochemistry and comprises a self-selection phase separation tower, a waste water liquid inlet, a volatile component outlet, a self-selection phase separation liquid supernatant, a self-selection phase separation liquid subnatant, a liquid level meter, a mass transfer cabin, a capture chamber, a mass transfer channel and an electrolytic bath, according to the utility model, the problems of ion exchange membrane failure, catalyst deactivation, secondary pollution and toxic gas generation and the like caused by complex industrial wastewater components are fundamentally solved, the problem of large occupied space of a large-size purification system is avoided, and the hydrogen production efficiency of hydrogen production by electrolysis of industrial wastewater is greatly improved; and meanwhile, resource utilization of industrial wastewater in the future is facilitated, and a powerful technical support is provided for direct hydrogen production of the industrial wastewater.

Description

Technical Field

[0001] The utility model relates to the field of electrochemistry, and more specifically to a wastewater hydrogen production system based on phase separation. Background Art

[0002] Hydrogen production by water electrolysis is highly dependent on pure water. However, my country and even the world are in a current situation of shortage of fresh water resources. A large amount of wastewater is generated in industry and life. If it is used for hydrogen production, it will realize the energy utilization of wastewater resources, which is an important means for the future green transformation of the industry and the development of new quality productivity. However, the composition of wastewater is extremely complex, including inorganic salts, water, organic matter, volatile matter, etc. Among them, inorganic salt ions, especially chloride ions, may undergo competitive reactions (such as chlorine evolution side reactions) to cause catalyst poisoning or corrosion; secondly, organic matter may cause side reactions in the electrolysis process, or adsorb on the electrode surface, reducing the electrolysis efficiency; the introduction of volatile matter may cause the gas produced by electrolysis to be mixed with impurities and have lower purity.

[0003] The current common industrial method of producing hydrogen from wastewater is still to obtain pure water through pretreatment and then produce hydrogen through electrolysis. This involves complex and cumbersome process flows, such as solid sedimentation, sterilization, multi-stage reverse osmosis, resin exchange, etc., which are costly and complex. In addition, if wastewater is directly passed into the electrolysis system for hydrogen production, it is difficult to ensure the purity, efficiency, effect of hydrogen production and the life of system equipment; and due to the complexity of wastewater, it is difficult to achieve comprehensive coverage of a set of equipment, and targeted development is required, which greatly increases manpower, engineering and other costs. Therefore, it is urgent to develop simple, efficient, low-cost, highly tolerant and universal system equipment for efficient hydrogen production from wastewater. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wastewater hydrogen production system based on phase separation.

[0005] The purpose of the utility model is achieved through the following solutions:

[0006] A wastewater hydrogen production system based on phase separation, characterized in that it comprises: a self-selective phase-separation tower, a wastewater inlet, an upper layer of self-selective phase-separation liquid, a lower layer of self-selective phase-separation liquid, a mass transfer chamber, a capture chamber, a mass transfer channel and an electrolyzer; the self-selective phase-separation tower is used to separate organic components and inorganic components in wastewater, a wastewater inlet is provided on the self-selective phase-separation tower, and a self-selective phase-separation liquid with selective separation is filled in the self-selective phase-separation tower; wastewater enters the self-selective phase-separation tower from the wastewater inlet and contacts with the self-selective phase-separation liquid, and the self-selective phase-separation liquid with selective separation can separate the organic components in the wastewater into the self-selective phase-separation liquid The upper layer obtains the self-selected phase-separation liquid upper layer liquid, and the inorganic components in the wastewater are phase-separated to the lower layer of the self-selected phase-separation liquid to obtain the self-selected phase-separation liquid lower layer liquid; the self-selected phase-separation tower is connected to the mass transfer cabin, and the inorganic solution of the lower layer of the self-selected phase-separation liquid can enter the mass transfer cabin for storage; the mass transfer cabin is provided with a gas inlet for introducing gas into the liquid contained in the mass transfer cabin, and the gas creates a high humidity environment in the mass transfer cabin, and after the high humidity gas passes through the mass transfer channel, a gas containing only high-purity water vapor is obtained, and then enters the capture chamber; a spray device is provided in the capture chamber for circulating and spraying electrolyte, and the electrolyte directly absorbs pure water in the high humidity gas.

[0007] Furthermore, the self-selected phase-separation liquid includes a lower layer liquid and an upper layer liquid; the lower layer liquid includes 10-25wt% magnesium sulfate, 10-25wt% sodium sulfate and 15-34wt% sodium citrate; the upper layer liquid includes PEG400 aqueous solution, PEG600 aqueous solution, PEG800 aqueous solution, PEG1000 aqueous solution, PEG1500 aqueous solution, PEG2000 aqueous solution, PEG3000 aqueous solution, PEG4000 aqueous solution, PEG6000 aqueous solution or PEG8000 aqueous solution.

[0008] Furthermore, a volatile matter outlet is provided on the self-selective phase separation tower, and if the wastewater contains volatile matter, the volatile matter outlet is discharged or collected for post-treatment.

[0009] Furthermore, the gas introduced into the liquid contained in the mass transfer chamber comes directly from a gas separated from the oxygen / hydrogen produced by electrolysis, or an inert gas is added; these gases are further circulated through an external air pump; if the oxygen produced by electrolysis is used, when oxygen is not needed as a product, the oxygen produced by electrolysis can be continuously used to create a high humidity environment.

[0010] Furthermore, a demister or a waterproof and breathable filter layer is provided on the mass transfer channel to block small water droplets or salt mist brought out by the gas in the mass transfer cabin.

[0011] Furthermore, the electrolyte circulated and sprayed in the capture chamber is an electrolyte with low saturated vapor pressure, high conductivity, and electrochemical stability, specifically including KOH solution, K2 CO 3 Solution, KHCO 3 solution, NaOH solution, Na 2 CO 3 Solution, NaHCO 3 Solution, K 3 PO 4 Solution, CH 3 COOK solution, H 2 SO 4 Solution, HClO 4 , H 3 PO 4 Any one or more combinations of solutions.

[0012] Furthermore, it also includes a power supply module, which supplies power to the electrolytic cell.

[0013] Furthermore, it also includes a liquid level meter and a control system. When the liquid concentration in the lower layer of the self-selected phase-separation liquid rises to a set value, or the liquid level drops to a set height of the liquid level meter, the control system is triggered to control the wastewater inlet to open, so that the wastewater enters the self-selective phase-separation tower through the wastewater inlet again, and the organic matter in the wastewater remains in the upper layer of the self-selected phase-separation liquid, and the inorganic salts and water in the wastewater enter the lower layer, thereby providing a continuous supply of water for hydrogen production by electrolysis.

[0014] Furthermore, it also includes a solid-liquid separator, in which solid matter is deposited at the bottom of the self-selective phase separation tower and the mass transfer chamber, and after the solid matter enters the solid-liquid separator by opening the channel at a fixed time, the solid salt is separated and the excess water continues to return to the system.

[0015] Furthermore, by using the waste heat generated by electrolysis as a heat source to heat the self-selective phase separation liquid, the phase separation effect and the self-selective separation effect of wastewater are enhanced, and at the same time, the water in the lower layer of the self-selective phase separation liquid is accelerated to be absorbed by the electrolyte through heating.

[0016] Furthermore, it also includes a hydrogen separator, an oxygen separator and a hydrogen purifier. The hydrogen generated by electrolysis passes through the hydrogen separator and the hydrogen purifier, and the oxygen passes through the oxygen separator and the oxygen purifier to obtain the final product.

[0017] The beneficial effects of the utility model include:

[0018] The present utility model has explored a new connection mechanism after creative thinking: through self-selective phase separation, the organic matter, volatile matter, and inorganic salt solution in the wastewater are automatically separated, and at the same time, a high-humidity gas environment is induced to transfer pure water molecules to the electrolyte, so that pure water is supplemented for electrolytic hydrogen production without additional energy consumption. Specifically, it can induce the organic matter, inorganic solution, volatile matter and other components in the wastewater to separate into the upper liquid layer, and at the same time, a high-humidity gas environment is created by blowing air into the lower liquid layer, so that pure water molecules enter the electrolyte in the water capture device through the interface pressure difference. The self-selective phase separation tower, the moisture creation chamber and the mass transfer chamber can be integrated into an integrated device to achieve the above functions. Different from the conventional separation method that requires additional energy consumption to obtain pure water through condensation after generating high-humidity gas, in the present utility model, due to the natural pressure difference driving force between the high-humidity gas and the electrolyte, the process of the electrolyte absorbing the gas does not require additional energy consumption.

[0019] The utility model can obtain pure water from complex wastewater through electrolytes for hydrogen production. The utility model fundamentally solves the problems of ion exchange membrane failure, catalyst deactivation, secondary pollution and toxic gas generation due to the complex composition of industrial wastewater, avoids the problem of large space occupied by large-scale purification systems, and greatly improves the hydrogen production efficiency of electrolysis of industrial wastewater. At the same time, it is conducive to the resource utilization of industrial wastewater in the future and provides strong technical support for direct hydrogen production from industrial wastewater.

[0020] The utility model can effectively isolate organic and inorganic substances in wastewater, thereby ensuring that pure water enters the electrolyte for electrolytic hydrogen production, avoiding the systematic impact of complex components of wastewater on electrolytic hydrogen production. In addition, the system provided by the utility model is universal and does not need to be customized for wastewater in specific scenarios, thus greatly saving engineering, labor, and brainpower costs, etc., and facilitating rapid and large-scale product promotion.

[0021] The utility model directly utilizes the waste heat generated by electrolysis without the need to find an additional heat source, and can improve the comprehensive energy utilization efficiency of the system. At the same time, compared with conventional wastewater treatment or wastewater hydrogen production systems, the utility model can also recover solid salts in wastewater while producing hydrogen, realizing the dual-effect utilization of wastewater as a resource and energy.

[0022] The utility model realizes the process of producing hydrogen by electrolysis of industrial wastewater. Compared with the existing wastewater treatment process, it can realize low-cost wastewater treatment and the production of hydrogen energy at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0025] Figure 2 The data test results of the system running stably for more than 72 hours in Case 1 of the technical effect verification of the utility model;

[0026] Figure 3 The data test results of the system running stably for more than 72 hours in Case 2 of the technical effect verification of the utility model;

[0027] Among them, 1-self-selective phase separation tower; 2-wastewater inlet; 3-volatile matter outlet; 4-self-selective phase separation liquid upper layer liquid; 5-self-selective phase separation liquid lower layer liquid; 6-liquid level meter; 7-mass transfer chamber; 8-capture chamber; 9-mass transfer channel; 10-solid-liquid separator; 11-solid salt; 12-electrolyzer; 13-power supply module; 14-hydrogen separator; 15-oxygen separator; 16-hydrogen purifier. DETAILED DESCRIPTION

[0028] All features disclosed in all embodiments in this specification, or all features implicitly disclosed, except mutually exclusive features and / or steps, can be combined and / or expanded or replaced in any manner.

[0029] The specific implementation process of the utility model is as follows:

[0030] The utility model provides a wastewater hydrogen production system based on phase separation, comprising a self-selective phase separation tower 1, a wastewater inlet 2, a volatile matter outlet 3, a self-selective phase separation liquid upper layer liquid 4, a self-selective phase separation liquid lower layer liquid 5, a liquid level meter 6, a mass transfer cabin 7, a capture chamber 8, a mass transfer channel 9, a solid-liquid separator 10, a solid salt 11, an electrolyzer 12, a power supply module 13, a hydrogen separator 14, an oxygen separator 15 and a hydrogen purifier 16.

[0031] Specifically, the self-selective phase-separation tower 1 is a device for separating organic components and inorganic components in wastewater. The utility model is filled with a self-selective phase-separation liquid with selective separation in the device. When the wastewater enters the self-selective phase-separation tower 1 from the wastewater inlet 2 and contacts the self-selective phase-separation liquid, the self-selective phase-separation liquid with selective separation can be used to separate the organic components in the wastewater to the upper layer of the self-selective phase-separation liquid to obtain the self-selective phase-separation liquid upper layer liquid 4, and the inorganic components in the wastewater can be separated to the lower layer of the self-selective phase-separation liquid to obtain the self-selective phase-separation liquid lower layer liquid 5. If the wastewater contains volatiles, they can be simultaneously discharged or collected through the volatile outlet 3 of the self-selective phase-separation tower for post-treatment. As an optional scheme, the self-selected phase separation liquid can be a composition of a lower layer liquid (10-25wt% magnesium sulfate, 10-25wt% sodium sulfate, 15-34wt% sodium citrate) and an upper layer liquid (PEG400 aqueous solution, PEG600 aqueous solution, PEG800 aqueous solution, PEG1000 aqueous solution, PEG1500 aqueous solution, PEG2000 aqueous solution, PEG3000 aqueous solution, PEG4000 aqueous solution, PEG6000 aqueous solution or PEG8000 aqueous solution).

[0032] After selective separation in the self-selective phase separation tower 1, the water and inorganic substances in the wastewater enter the lower layer of the self-selective phase separation liquid. The self-selective phase separation tower 1 is connected to the mass transfer chamber 7, and the inorganic solution in the lower layer of the self-selective phase separation liquid enters the mass transfer chamber 7.

[0033] The mass transfer chamber 7 is used to hold the inorganic solution in the lower layer of the self-selected phase separation liquid, and to introduce gas into the contained liquid. The gas comes directly from a gas separated from the oxygen / hydrogen produced by electrolysis, or an inert gas (nitrogen, argon, etc.) is added. These gases can be further recycled through an external air pump. If oxygen produced by electrolysis is used, when oxygen is not needed as a product, the oxygen produced by electrolysis can also be continuously used to create a high humidity environment.

[0034] A high humidity environment is created in the mass transfer cabin 7 by the gas. After the high humidity gas passes through the mass transfer channel 9, the gas containing only high-purity water vapor is obtained and enters the capture chamber 8. A demister or a waterproof and breathable filter layer is provided on the mass transfer channel 9 to block small water droplets or salt mist etc. brought out of the mass transfer cabin 7 by the gas.

[0035] The capture chamber 8 is circulated with an electrolyte (such as KOH, NaOH, K 2 CO 3 , H 2 SO 4 HClO 4 The high humidity gas entering the capture chamber 8 from the mass transfer chamber 7 has a positive vapor pressure difference with the electrolyte, inducing the moisture in the gas to be absorbed by the electrolyte, and providing pure moisture for subsequent electrolytic hydrogen production.

[0036] The gas that has absorbed moisture is continuously passed into the lower layer liquid 5 of the self-selective phase-separation liquid in the mass transfer chamber 7 to construct a high humidity environment; the inorganic solution in the mass transfer chamber 7 that has consumed moisture is connected to the self-selective phase-separation tower 1, so the concentration of the inorganic solution is balanced between the two, laying the foundation for the solution environment for further wastewater to continue to be passed into the self-selective phase-separation tower 1 and to separate the organic phase and the inorganic aqueous solution.

[0037] When the concentration of the lower layer of the self-selective phase-separation liquid rises to the set value, or the liquid level drops to the set height of the liquid level gauge 6, the trigger system controls the wastewater inlet 2 to open, so that the wastewater enters the self-selective phase-separation tower 1 through the wastewater inlet 2 again, and the organic matter in the wastewater is separated to the upper layer of the self-selective phase-separation liquid again, and the inorganic salts and water in the wastewater enter the lower layer, thereby providing a continuous supply of water for hydrogen production by electrolysis.

[0038] The power supply module 13 supplies power to the electrolyzer 12 for producing hydrogen by electrolysis. The hydrogen produced by electrolysis passes through the hydrogen separator 14 and the hydrogen purifier 16, and the oxygen passes through the oxygen separator 15 and is purified to obtain the final product.

[0039] In addition, since the wastewater contains high salt content, some solid salt will be deposited at the bottom of the self-selective phase separation tower 1 and the mass transfer chamber 7 after the water is consumed. After the solid salt enters the solid-liquid separator 10 by opening the channel at a fixed time, the solid salt 11 is separated and the excess water continues to return to the system.

[0040] The utility model can effectively isolate organic and inorganic substances in wastewater, thereby ensuring that pure water enters the electrolyte for electrolytic hydrogen production, thereby avoiding the systematic impact of complex components of wastewater on electrolytic hydrogen production.

[0041] During the whole process, the waste heat generated by electrolysis can also be used as a heat source to heat the self-selective phase separation liquid to enhance the phase separation effect and the self-selective separation effect of wastewater. At the same time, heating can be used to accelerate the entry of water in the lower layer of the self-selective phase separation into the electrolyte.

[0042] The system will realize the process of hydrogen production by electrolysis of industrial wastewater. Compared with the existing wastewater treatment process, it can achieve low-cost wastewater treatment while realizing the production of hydrogen energy.

[0043] Any process flow in an industrial electrolysis system that integrates the above-mentioned principle device falls within the protection scope of the present utility model.

[0044] The utility model has the following advantages:

[0045] The utility model can effectively isolate organic and inorganic substances in wastewater, thereby ensuring that pure water enters the electrolyte for electrolytic hydrogen production, thereby avoiding the systematic impact of complex components of wastewater on electrolytic hydrogen production.

[0046] The utility model realizes the process of producing hydrogen by electrolysis of industrial wastewater. Compared with the existing wastewater treatment process, it can realize low-cost wastewater treatment and the production of hydrogen energy at the same time.

[0047] During the whole process, the waste heat generated by electrolysis can also be used as a heat source to heat the self-selective phase separation liquid to enhance the phase separation effect and the self-selective separation effect of wastewater. At the same time, heating can be used to accelerate the entry of water in the lower layer of the self-selective phase separation into the electrolyte.

[0048] The utility model greatly ensures the stability and feasibility of the system, and because the system is mature, it is easy to quickly realize large-scale preparation.

[0049] Since the electrolyte is supplemented with impurity-free water in the mass transfer chamber in the utility model, all organic matter, inorganic matter, volatile matter, etc. are isolated outside, thus breaking through the bottleneck of direct industrial wastewater hydrogen production being restricted by the composition of industrial wastewater due to different sources of wastewater. In addition, the utility model can effectively prevent the oxidation and escape of harmful and toxic components in industrial wastewater, and is a green, non-toxic and environmentally friendly process system. The electrolytic hydrogen production system does not contain impurity ions such as calcium ions and magnesium ions, and there will be no calcium and magnesium precipitation during long-term operation, reducing the cost of later cleaning and maintenance.

[0050] The utility model system has good stability and high efficiency. By utilizing the phase separation function of the self-selected phase separation liquid and creating a gas environment of pure water molecules, the organic matter in the wastewater is phase-separated to the upper liquid of the self-selected phase separation liquid, and the inorganic matter in the wastewater is phase-separated to the lower liquid. At the same time, a high-humidity gas environment is created in the mass transfer chamber, and the pure water molecules in the gas are absorbed by the electrolyte in the capture chamber, which can completely isolate the organic and inorganic matter in the wastewater from the outside and avoid their influence on the electrolyte, thereby obtaining high-purity hydrogen without any corrosion and toxicity to the electrolysis system.

[0051] For further optimization, the self-selective phase-separation tower and mass transfer chamber can be provided with an insulating coating on the surface, or a vacuum sandwich structure can be provided for overall thermal insulation, and the waste heat generated by electrolysis can be used as a heat source for the self-selective phase-separation liquid to enhance the phase separation effect and the self-selective separation effect of wastewater. At the same time, heating can be used to accelerate the entry of water in the lower layer of the self-driving liquid into the electrolyte.

[0052] The capture chamber in the mass transfer cabin of the utility model system replenishes water for the electrolyte for electrolysis; at the same time, electrolysis synchronously consumes water to continuously maintain the interface pressure difference between the electrolyte and the high-humidity gas, thereby continuing to induce water to evaporate from the lower layer of the self-selected phase separation liquid, thereby creating a high-humidity gas environment; the water in the lower layer of the self-selected phase separation liquid is further consumed, providing a solution concentration environment for further wastewater self-selective separation. This multi-correlated regulation process allows the system to continuously use industrial wastewater for hydrogen production.

[0053] The utility model system collects hydrogen and oxygen independently and can collect high-purity hydrogen and oxygen at the same time.

[0054] The utility model system can realize a dynamic and continuous process of hydrogen production using any type of industrial wastewater without distinction, and has no restrictions on wastewater components, concentration, etc.; in addition, the system can provide a way of energy utilization of industrial wastewater, turning a large amount of industrial wastewater into treasure, and realizing the development of new clean energy while reducing environmental pollution.

[0055] Case 1 of technical effect verification of this utility model:

[0056] Use 25% MgSO 4 The self-selected phase separation liquid is formed by mixing with 30wt% PEG8000, and chemical wastewater is used as the water source. The wastewater mainly contains inorganic salt ions such as chloride ions, sulfate ions, sodium ions, acetone, chloroform, tetrachloroethane, acetone aldehyde dimethyl acetal and other organic substances and volatiles. The KOH electrolyte has a concentration of 45wt%, and the electrolytic cell operates at 60°C for more than 72 hours without side reactions and catalyst corrosion. After the reaction, the proportion of each impurity component in the KOH electrolyte is less than 0.1wt%, such as Figure 1 shown.

[0057] Case 2 of technical effect verification of this utility model:

[0058] Use 25% MgSO 4 The self-selective phase separation liquid is formed by mixing with 30wt% PEG8000, and chemical wastewater is used as the water source. The wastewater mainly contains inorganic salt ions such as chloride ions, sulfate ions, sodium ions, acetone, trimethylsilanol, trichloromethane, tetrachloroethylene, pentachloroethane, hexachloroethane and silicone oil. The KOH electrolyte is 45wt% in concentration, and the electrolytic cell is operated at 60°C for more than 72 hours without side reactions and catalyst corrosion. After the reaction, the proportion of each impurity component in the KOH electrolyte is less than 0.1wt%, such as Figure 2 shown.

[0059] It should be noted that within the scope of protection defined in the claims of the present utility model, the following embodiments can be combined and / or expanded or replaced in any logical way from the above specific implementation methods, such as disclosed technical principles, disclosed technical features or implicitly disclosed technical features.

[0060] Example 1

[0061] A wastewater hydrogen production system based on phase separation, comprising:

[0062] Self-selective phase-separation tower 1, wastewater inlet 2, self-selective phase-separation liquid upper layer liquid 4, self-selective phase-separation liquid lower layer liquid 5, mass transfer chamber 7, capture chamber 8, mass transfer channel 9 and electrolytic cell 12; the self-selective phase-separation tower 1 is used to separate organic components and inorganic components in wastewater, and the wastewater inlet 2 is provided on the self-selective phase-separation tower 1, and the self-selective phase-separation liquid with selective separation is filled in the self-selective phase-separation tower 1; the wastewater enters the self-selective phase-separation tower 1 from the wastewater inlet 2 and contacts with the self-selective phase-separation liquid, and the self-selective phase-separation liquid with selective separation can separate the organic components in the wastewater to the upper layer of the self-selective phase-separation liquid to obtain the self-selective phase-separation liquid The upper liquid 4 phase-separates the inorganic components in the wastewater to the lower layer of the self-selected phase-separation liquid to obtain the lower layer liquid 5 of the self-selected phase-separation liquid; the self-selected phase-separation tower 1 is connected to the mass transfer chamber 7, and the inorganic solution of the lower layer of the self-selected phase-separation liquid can enter the mass transfer chamber 7 for storage; the mass transfer chamber 7 is provided with a gas inlet for introducing gas into the liquid contained in the mass transfer chamber 7, and the gas creates a high humidity environment in the mass transfer chamber 7, and the high humidity gas passes through the mass transfer channel 9 to obtain a gas containing only high-purity water vapor, and then enters the capture chamber 8; a spraying device is provided in the capture chamber 8 for circulating and spraying electrolyte, and the electrolyte directly absorbs the pure water in the high humidity gas.

[0063] Example 2

[0064] Based on Example 1, the self-selected phase separation liquid includes a lower layer liquid and an upper layer liquid; the lower layer liquid includes 10-25wt% magnesium sulfate, 10-25wt% sodium sulfate and 15-34wt% sodium citrate; the upper layer liquid includes PEG400 aqueous solution, PEG600 aqueous solution, PEG800 aqueous solution, PEG1000 aqueous solution, PEG1500 aqueous solution, PEG2000 aqueous solution, PEG3000 aqueous solution, PEG4000 aqueous solution, PEG6000 aqueous solution or PEG8000 aqueous solution.

[0065] Example 3

[0066] On the basis of Example 1, a volatile matter outlet 3 is provided on the self-selective phase separation tower 1. If the wastewater contains volatile matter, it is discharged through the volatile matter outlet 3 or collected for post-treatment.

[0067] Example 4

[0068] On the basis of Example 1, gas is introduced into the liquid contained in the mass transfer chamber 7, and the gas comes directly from a gas separated from the oxygen / hydrogen produced by electrolysis, or an inert gas is added; these gases are further circulated through an external air pump; if oxygen produced by electrolysis is used, when oxygen is not needed as a product, the oxygen produced by electrolysis can be continuously used to create a high humidity environment.

[0069] Example 5

[0070] On the basis of Example 1, a demister or a waterproof and breathable filter layer is provided on the mass transfer channel 9 to block the small water droplets or salt mist brought out by the gas in the mass transfer cabin 7 .

[0071] Example 6

[0072] On the basis of Example 1, the electrolyte circulated and sprayed in the capture chamber 8 is an electrolyte with low saturated vapor pressure, high conductivity, and electrochemical stability, specifically including KOH solution, K 2 CO 3 Solution, KHCO 3 solution, NaOH solution, Na 2 CO 3 Solution, NaHCO 3 Solution, K 3 PO 4 Solution, CH 3 COOK solution, H 2 SO 4 Solution, HClO 4 , H 3 PO 4 Any one or more combinations of solutions.

[0073] Example 7

[0074] On the basis of embodiment 1, it further includes a power supply module 13 , which supplies power to the electrolytic cell 12 .

[0075] Example 8

[0076] On the basis of Example 1, it also includes a liquid level meter 6 and a control system. When the concentration of the lower layer liquid 5 of the self-selected phase-separation liquid rises to a set value, or the liquid level drops to a set height of the liquid level meter 6, the control system is triggered to control the wastewater inlet 2 to open, so that the wastewater enters the self-selective phase-separation tower 1 through the wastewater inlet 2 again, and the organic matter in the wastewater remains in the upper layer of the self-selected phase-separation liquid, and the inorganic salts and water in the wastewater enter the lower layer, thereby providing a continuous supply of water for hydrogen production by electrolysis.

[0077] Example 9

[0078] On the basis of Example 1, a solid-liquid separator 10 is further included. Solid matter is deposited at the bottom of the self-selective phase separation tower 1 and the mass transfer chamber 7. After the solid matter enters the solid-liquid separator 10 by opening the channel at a fixed time, the solid salt 11 is separated and the excess water continues to return to the system.

[0079] Example 10

[0080] On the basis of Example 1, the waste heat generated by electrolysis is used as a heat source to heat the self-selective phase-separation liquid to enhance the phase separation effect and the self-selective separation effect of wastewater. At the same time, heating is used to accelerate the absorption of water in the self-selective phase-separation lower layer liquid 5 by the electrolyte.

[0081] Embodiment 11

[0082] On the basis of Example 1, it also includes a hydrogen separator 14, an oxygen separator 15 and a hydrogen purifier 16. The hydrogen generated by electrolysis passes through the hydrogen separator 14 and the hydrogen purifier 16, and the oxygen passes through the oxygen separator 15 and oxygen purification to obtain the final product.

[0083] The specific implementation methods of the present utility model are not limited to the above-mentioned methods. The above description is only the preferred embodiment of the present utility model and the technical principles used. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described here. It is possible for those skilled in the art to make various obvious changes, adjustments and substitutions without departing from the scope of protection of the present utility model. Therefore, although the present utility model is described in more detail through the above embodiments, the present utility model is not limited to the above embodiments, but may also include more other equivalent embodiments without departing from the principles and concepts of the present utility model, and the scope of the present utility model is determined by the scope of the attached claims.

Claims

1. A wastewater hydrogen production system based on phase separation, characterized in that: include: A self-selective phase separation tower (1), a wastewater inlet (2), a self-selective phase separation liquid upper layer liquid (4), a self-selective phase separation liquid lower layer liquid (5), a mass transfer chamber (7), a capture chamber (8), a mass transfer channel (9) and an electrolytic cell (12); The self-selective phase-separation tower (1) is used to separate organic components and inorganic components in wastewater. A wastewater inlet (2) is provided on the self-selective phase-separation tower (1), and a self-selective phase-separation liquid with selective separation is filled in the self-selective phase-separation tower (1); wastewater enters the self-selective phase-separation tower (1) from the wastewater inlet (2) and contacts with the self-selective phase-separation liquid. The self-selective phase-separation liquid with selective separation can separate the organic components in the wastewater to the upper layer of the self-selective phase-separation liquid to obtain the self-selective phase-separation liquid upper layer liquid (4), and separate the inorganic components in the wastewater to the lower layer of the self-selective phase-separation liquid to obtain the self-selective phase-separation liquid. The subliquid layer liquid (5) is connected to the mass transfer chamber (7) by the self-selective phase separation tower (1), and the inorganic solution in the sublime layer of the self-selective phase separation liquid can enter the mass transfer chamber (7) for storage; the mass transfer chamber (7) is provided with a gas inlet for introducing gas into the liquid stored in the mass transfer chamber (7), and the gas creates a high humidity environment in the mass transfer chamber (7). After the high humidity gas passes through the mass transfer channel (9), the gas containing only high purity water vapor is obtained and enters the capture chamber (8); the capture chamber (8) is provided with a spraying device for circulating and spraying electrolyte, and the electrolyte directly absorbs the pure water in the high humidity gas.

2. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The self-selected phase separation liquid includes a lower layer liquid and an upper layer liquid; the lower layer liquid includes 10-25wt% magnesium sulfate, 10-25wt% sodium sulfate and 15-34wt% sodium citrate; the upper layer liquid includes PEG400 aqueous solution, PEG600 aqueous solution, PEG800 aqueous solution, PEG1000 aqueous solution, PEG1500 aqueous solution, PEG2000 aqueous solution, PEG3000 aqueous solution, PEG4000 aqueous solution, PEG6000 aqueous solution or PEG8000 aqueous solution.

3. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The self-selective phase separation tower (1) is provided with a volatile matter outlet (3). If the wastewater contains volatile matter, the volatile matter is discharged through the volatile matter outlet (3) or collected for post-treatment.

4. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The gas introduced into the liquid contained in the mass transfer chamber (7) is directly derived from a stream of oxygen / hydrogen generated by electrolysis, or an inert gas is added; the gas is further circulated through an external air pump; if the oxygen generated by electrolysis is used, when oxygen is not needed as a product, the oxygen generated by electrolysis can be continuously used to create a high humidity environment.

5. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: A defoamer or a waterproof and breathable filter layer is provided on the mass transfer channel (9) to block small water droplets or salt mist brought out by the gas in the mass transfer chamber (7).

6. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The electrolyte circulated and sprayed in the capture chamber (8) is an electrolyte with low saturated vapor pressure, high electrical conductivity and electrochemical stability, specifically including any one or more combinations of KOH solution, K2CO3 solution, KHCO3 solution, NaOH solution, Na2CO3 solution, NaHCO3 solution, K3PO4 solution, CH3COOK solution, H2SO4 solution, HClO4, and H3PO4 solution.

7. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: It also includes a power supply module (13), which supplies power to the electrolytic cell (12).

8. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: It also includes a liquid level meter (6) and a control system. When the concentration of the lower layer liquid (5) of the self-selective phase separation liquid rises to a set value, or the liquid level drops to a set height of the liquid level meter (6), the control system is triggered to control the wastewater inlet (2) to open, so that the wastewater enters the self-selective phase separation tower (1) through the wastewater inlet (2) again, and the organic matter in the wastewater remains in the upper layer of the self-selective phase separation liquid, and the inorganic salts and water in the wastewater enter the lower layer, thereby providing a continuous supply of water for electrolytic hydrogen production.

9. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The invention also comprises a solid-liquid separator (10). Solid matter is deposited at the bottom of the self-selective phase separation tower (1) and the mass transfer chamber (7). The solid matter enters the solid-liquid separator (10) by opening the channel at a fixed time, and the solid salt (11) is separated, and the excess water continues to return to the system.

10. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: By using the waste heat generated by electrolysis as a heat source to heat the self-selective phase separation liquid, the phase separation effect and the self-selective separation effect of wastewater are enhanced. At the same time, heating is used to accelerate the absorption of water in the lower layer liquid (5) of the self-selective phase separation by the electrolyte.

11. The wastewater hydrogen production system based on phase separation according to claim 1, characterized in that: The invention also comprises a hydrogen separator (14), an oxygen separator (15) and a hydrogen purifier (16). The hydrogen generated by electrolysis passes through the hydrogen separator (14) and the hydrogen purifier (16), and the oxygen passes through the oxygen separator (15) and the oxygen purifier to obtain the final product.

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