In-situ electrolytic hydrogen production device and method for sewage and wastewater

Abstract

The invention relates to the technical field of sewage and wastewater treatment in-situ recycling, in particular to a sewage and wastewater in-situ electrolytic hydrogen production device and method.The sewage and wastewater in-situ electrolytic hydrogen production device comprises a vacuum device, a vacuum tank, a liquid storage tank, a raw water tank, a self-cleaning filter, a water pump, a membrane distillation assembly, a steam-water separation tank, a condenser and an electrolytic hydrogen production unit. The electrolytic hydrogen production unit is communicated with the liquid storage tank, the vacuum device is communicated with the vacuum tank, the vacuum tank is communicated with the liquid storage tank, the condenser is communicated with the vacuum tank, the steam-water separation tank is communicated with the condenser, the membrane distillation assembly is communicated with the steam-water separation tank, the water pump is communicated with the membrane distillation assembly, the raw water tank is communicated with the water pump, and the self-cleaning filter is communicated with the raw water tank. Therefore, purified water is obtained after the sewage and wastewater are filtered and subjected to membrane distillation and enters the liquid storage tank. The electrolytic hydrogen production unit electrolyzes purified water to produce hydrogen and oxygen, the hydrogen is converted into hydrogen energy, emergency energy supply is provided for the sewage station, the oxygen can be supplied back to the sewage and wastewater station for pure oxygen aeration, and the energy consumption of equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the field of electrolytic hydrogen production from wastewater treatment, and in particular to a device and method for in-situ electrolytic hydrogen production from wastewater. Background Art

[0002] Hydrogen energy is recognized as a green and clean energy of the future. Hydrogen energy is usually produced by electrolyzing water to obtain hydrogen, which consumes a large amount of water resources.

[0003] my country has built a large number of urban sewage treatment plants, rural sewage treatment stations, and industrial wastewater treatment stations / plants. The destinations of these treated sewage and wastewater are nothing more than direct discharge and internal reuse, and they have not been fully utilized. At the same time, the aeration process in the operation of these treatment plants requires a large amount of oxygen. For a long time, external air has been used directly as the air source, but the oxygen content of air is only about 21%, so the aeration efficiency is low, which increases energy consumption, equipment operation loss and failure rate.

[0004] Existing water electrolysis hydrogen production devices or technologies use seawater, river water, city tap water, etc. as water sources, which are not suitable for on-site utilization of produced water from sewage treatment plants. Summary of the invention

[0005] The purpose of the present invention is to provide an in-situ electrolysis hydrogen production device and method for wastewater, so as to enable the wastewater at the site to be utilized in situ to produce raw water that meets the requirements of electrolysis hydrogen production, thereby converting the wastewater resources into hydrogen and oxygen on-site, converting hydrogen into hydrogen energy, and supplying oxygen back for pure oxygen aeration.

[0006] To achieve the above-mentioned objectives, in a first aspect, the present invention provides an in-situ electrolysis hydrogen production device for wastewater, comprising a vacuum device, a vacuum tank, a liquid storage tank, a raw water tank, a self-cleaning filter, a water pump, a membrane distillation component, a steam-water separation tank, a condenser and an electrolysis hydrogen production unit, wherein the vacuum tank is connected to the liquid storage tank, the vacuum device is connected to the vacuum tank, the condenser is connected to the vacuum tank, the steam-water separation tank is connected to the condenser, the membrane distillation component is connected to the steam-water separation tank, the electrolysis hydrogen production unit is connected to the liquid storage tank, the water pump is connected to the membrane distillation component, the raw water tank is connected to the water pump, and the self-cleaning filter is connected to the raw water tank.

[0007] Wherein, the raw water tank comprises a water tank body, a heater and a temperature control module. The heater is arranged on one side of the water tank body, and the temperature control module is connected to the heater.

[0008] Among them, the self-cleaning filter includes a filter shell, two placement shells, a driving motor, a gear and two racks. The two placement shells are slidably arranged in the filter shell, and the two racks are respectively fixed on the two placement shells. The gear is meshed with the two racks. The output end of the driving motor is fixedly connected to the gear. A filter element is detachably arranged in the filter shell.

[0009] Wherein, the self-cleaning filter further comprises a baffle, a rotating plate and a driver, wherein the baffle is arranged on one side of the filter shell, the rotating plate is rotatably arranged on one side of the baffle, and the output end of the driver is connected to the rotating plate.

[0010] Wherein, the self-cleaning filter further includes an alarm, and the alarm is arranged on the driver.

[0011] Wherein, the membrane distillation component adopts PVDF hydrophobic hollow fiber membrane.

[0012] Among them, the condenser includes a condenser, a heat exchange cavity, a preheating cavity and a circulating pump. The condenser is connected to the vacuum tank and the steam-water separation tank. The heat exchange cavity is arranged on the outside of the condenser, the circulating pump is connected to the heat exchange cavity, and the preheating cavity is arranged at the front end of the raw water tank.

[0013] Wherein, the condenser further includes a heat sink, and the heat sink is arranged outside the heat exchange cavity.

[0014] The membrane distillation assembly and the subsequent pipelines are evacuated by a vacuum device.

[0015] In a second aspect, the present invention also provides a method for using a wastewater in-situ electrolysis hydrogen production device, comprising: pre-treating the wastewater with a self-cleaning filter to remove large particle impurities;

[0016] After the impurities are removed, the wastewater enters the raw water tank to heat the raw water with automatic temperature control;

[0017] The heated water enters the membrane distillation module through a water pump, and the water completes gas-liquid separation inside the membrane distillation module, and the gas phase material is produced from the steam outlet of the membrane distillation module;

[0018] The water vapor produced at the steam outlet is separated into steam and water through a steam-water separation tank;

[0019] The gas phase is condensed into membrane distilled purified water in the condenser;

[0020] The electrolyzer performs electrolysis reaction on the clean water in the liquid storage tank.

[0021] The present invention discloses an in-situ electrolysis hydrogen production device and method for wastewater. The vacuum equipment and vacuum tank are used to create a negative pressure environment to promote the vaporization and evaporation of raw water at a temperature below 100°C. The liquid storage tank is connected to the vacuum tank so as to store the liquid that has been distilled and purified. Then, the condenser is connected to the vacuum tank, and its function is to cool the steam separated from the steam-water separation tank into liquid. The steam coming out of the membrane distillation component will enter the steam-water separation tank, where the pure water vapor and the entrained liquid water will be separated. The membrane distillation component is immediately before the steam-water separation tank. It uses a semipermeable membrane to selectively allow water vapor molecules to pass through and block liquid water and other pollutants, thereby purifying the water quality. In order to ensure smooth water flow, the system is also equipped with a water pump, which is located upstream of the membrane distillation component and is responsible for sending water flow into the membrane distillation component for treatment. The raw water required by the water pump comes from the raw water tank, which is the water source supply point in the entire system. In addition, in order to ensure the quality of raw water entering the system, the system is also equipped with a self-cleaning filter, which is connected to the raw water tank and can automatically remove larger particles in the water to prevent them from entering subsequent treatment units and affecting the treatment effect or causing equipment damage.

[0022] Through these components that cooperate with each other, the sewage treatment device of the present invention can not only effectively treat sewage, but also prepare hydrogen and oxygen products on-site during the treatment process, directly discharge the sewage, thereby realizing the resource utilization of sewage treatment, and utilizing subsequent products to further achieve the goal of low-carbon and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural diagram of a device for producing hydrogen by in-situ electrolysis of wastewater according to the present invention.

[0025] Figure 2 It is the right side structural diagram of a device for producing hydrogen by in-situ electrolysis of wastewater according to the present invention.

[0026] Figure 3 It is the left structural diagram of a device for producing hydrogen by in-situ electrolysis of wastewater according to the present invention.

[0027] Figure 4 It is a transverse cross-sectional structural diagram of a device for producing hydrogen by in-situ electrolysis of wastewater according to the present invention.

[0028] Figure 5It is a longitudinal cross-sectional structural diagram of a device for producing hydrogen by in-situ electrolysis of wastewater according to the present invention.

[0029] Figure 6 The present invention is a flow chart of a method for using a sewage and wastewater in-situ electrolysis hydrogen production device.

[0030] Vacuum tank 101, liquid storage tank 102, raw water tank 103, self-cleaning filter 104, water pump 105, membrane distillation component 106, steam-water separation tank 107, condenser 108, water tank body 109, heater 110, temperature control module 111, filter shell 112, placement shell 113, drive motor 114, gear 115, rack 116, baffle 117, rotating plate 118, driver 119, alarm 120, condenser 121, heat exchange cavity 122, preheating cavity 123, circulation pump 124, heat sink 125, electrolytic hydrogen production unit 126, vacuum device 127. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0033] First embodiment

[0034] See also Figure 1 to Figure 5The present invention provides an in-situ electrolysis hydrogen production device for wastewater, comprising a vacuum device 127, a vacuum tank 101, a liquid storage tank 102, a raw water tank 103, a self-cleaning filter 104, a water pump 105, a membrane distillation component 106, a steam-water separation tank 107 and a condenser 108, wherein the vacuum tank 101 is connected to the liquid storage tank 102, the vacuum device 127 is connected to the vacuum tank 101, the condenser 108 is connected to the liquid storage tank 102, the steam-water separation tank 107 is connected to the condenser 108, the membrane distillation component 106 is connected to the steam-water separation tank 107, the electrolysis hydrogen production unit 126 is connected to the liquid storage tank 102, the water pump 105 is connected to the membrane distillation component 106, the raw water tank 103 is connected to the water pump 105, and the self-cleaning filter 104 is connected to the raw water tank 103.

[0035] In this embodiment, the present invention proposes a wastewater treatment electrolysis hydrogen production device, which is designed to achieve resource utilization of wastewater through a series of efficient and environmentally friendly technical means.

[0036] The vacuum tank 101 is used to create a low-pressure environment to promote the vaporization and evaporation of raw water at a temperature below 100°C. The liquid storage tank 102 is connected to the vacuum tank 101 to store the liquid that has been distilled and purified. Then, the condenser 108 is connected to the vacuum tank 101, and its function is to cool the steam separated from the steam-water separation tank 107 into liquid. The steam coming out of the membrane distillation component 106 will enter the steam-water separation tank 107, where the water vapor and the entrained excess liquid are separated. The membrane distillation component 106 is immediately before the steam-water separation tank 107. It uses a hydrophobic microporous membrane for liquid separation. When there is a temperature difference between the two sides of the membrane, water molecules evaporate from the high-temperature side and reach the low-temperature side through the micropores of the membrane to condense, thereby achieving the separation, concentration or purification of the solution. In order to ensure smooth water flow, the system is also equipped with a water pump 105, which is located upstream of the membrane distillation component 106 and is responsible for sending water flow into the membrane distillation component 106 for treatment. The raw water required by the water pump 105 comes from the raw water tank 103, which is the water supply point in the entire system. In addition, in order to ensure the quality of the raw water entering the system, the system is also equipped with a self-cleaning filter 104, which is connected to the raw water tank 103 and can automatically remove larger particles in the water to prevent them from entering the subsequent treatment unit, affecting the treatment effect or causing equipment damage.

[0037] Through these components that cooperate with each other, the sewage treatment device of the present invention can not only effectively treat sewage, but also electrolyze the treated water through the electrolysis hydrogen production unit 126 to recycle hydrogen and oxygen during the treatment process, thereby realizing the resource utilization of sewage treatment and achieving the goal of low carbon and environmental protection.

[0038] The raw water tank 103 includes a water tank body 109 , a heater 110 and a temperature control module 111 . The heater 110 is disposed on one side of the water tank body 109 , and the temperature control module 111 is connected to the heater 110 .

[0039] The heater 110 is installed on one side of the water tank body 109 and is used to heat the raw water in the water tank. The temperature control module 111 is connected to the heater 110, which can accurately control the water temperature and automatically heat the raw water at a temperature of 50 to 90°C, thereby ensuring that the water temperature reaches the preset value, which helps the subsequent processing steps to proceed smoothly.

[0040] The self-cleaning filter 104 includes a filter shell 112, two placement shells 113, a drive motor 114, a gear 115 and two racks 116. The two placement shells 113 are slidably arranged in the filter shell 112, and the two racks 116 are respectively fixed on the two placement shells 113. The gear 115 is meshed with the two racks 116. The output end of the drive motor 114 is fixedly connected to the gear 115. A filter element is detachably arranged in the filter shell 112.

[0041] The two placement shells 113 can slide inside the filter shell 112, and a rack 116 is fixed to each placement shell 113. The gear 115 meshes with the two racks 116. When the drive motor 114 is started, its output end drives the gear 115 to rotate, thereby causing the two racks 116 and the placement shell 113 to reciprocate. The purpose of this design is to automatically clean impurities attached to the filter element. The filter element itself is detachably arranged inside the filter shell 112, which is convenient for regular replacement or cleaning.

[0042] The self-cleaning filter 104 further includes a baffle 117 , a rotating plate 118 and a driver 119 . The baffle 117 is disposed on one side of the filter housing 112 . The rotating plate 118 is rotatably disposed on one side of the baffle 117 . The output end of the driver 119 is connected to the rotating plate 118 .

[0043] The self-cleaning filter 104 further includes an alarm 120 , which is disposed on the driver 119 .

[0044] The filter is also equipped with an alarm 120 installed on the driver 119. When the filter needs maintenance or fails, the alarm 120 will sound an alarm to remind the operator to handle it in time.

[0045] The membrane distillation component 106 uses a PVDF hydrophobic hollow fiber membrane.

[0046] The membrane distillation component 106 uses PVDF (polyvinylidene fluoride) hydrophobic hollow fiber membrane material. This material has good chemical stability and mechanical strength, and has high porosity and permeability, which is suitable for efficient water purification process and can effectively separate pollutants in water. The special PVDF hydrophobic membrane for membrane distillation can more effectively permeate water vapor, ensuring that the final water quality meets the expected standards.

[0047] The condenser 108 includes a condenser 121, a heat exchange cavity 122, a preheating cavity 123 and a circulation pump 124. The condenser 121 is connected to the vacuum tank 101 and the steam-water separation tank 107. The heat exchange cavity 122 is arranged on the outside of the condenser 121. The circulation pump 124 is connected to the heat exchange cavity 122. The preheating cavity 123 is arranged at the front end of the raw water tank 103.

[0048] One end of the condenser 121 is connected to the vacuum tank 101, and the other end is connected to the steam-water separation tank 107, so as to guide the steam discharged from the steam-water separation tank 107 to the vacuum tank 101 for further processing. The heat exchange cavity 122 is wrapped around the outside of the condenser 121, and the internal cooling medium exchanges heat with the steam in the condenser 121, so that the steam is cooled into liquid water. The circulation pump 124 is connected to the heat exchange cavity 122. Through the action of the circulation pump 124, the cooling medium can continue to flow in the heat exchange cavity 122 to ensure the condensation efficiency. In addition, the preheating cavity 123 is arranged at the front end of the raw water tank 103, which is used to preheat the raw water that is about to enter the membrane distillation component 106, so as to improve the evaporation efficiency during the membrane distillation process.

[0049] The condenser 108 further includes a heat sink 125 , and the heat sink 125 is disposed outside the heat exchange cavity 122 .

[0050] In order to enhance the heat dissipation performance of the heat exchange cavity 122, the condenser 108 further includes heat sinks 125 disposed on the outside thereof. These heat sinks 125 can increase the contact area between the heat exchange cavity 122 and the outside air, accelerate the heat dissipation, and thus improve the cooling effect.

[0051] The membrane distillation assembly 106 and the subsequent pipelines are evacuated by a vacuum pump.

[0052] In addition, in order to ensure that the working environment of the membrane distillation module 106 is in the best state, the module and the subsequent pipelines are evacuated by a vacuum pump. This can not only reduce the air resistance inside the system and improve the separation efficiency of the membrane distillation module 106, but also prevent oxygen or other gases in the air from interfering with the hydrogen production process or contaminating the treated water quality, further improving the performance and reliability of the entire wastewater treatment system.

[0053] Second, see Figure 6 The present invention also provides a method for using a wastewater in-situ electrolysis hydrogen production device, comprising:

[0054] S201 The self-cleaning filter 104 pre-treats the wastewater to remove excess impurities;

[0055] The wastewater enters the self-cleaning filter 104 for pre-treatment. At this stage, the self-cleaning filter 104 intercepts and removes large particles and other suspended matter in the wastewater through the built-in filter element to ensure the normal operation of the subsequent treatment unit. The filter automatically cleans the filter element through the internal drive mechanism to maintain the filtration efficiency.

[0056] S202 The wastewater after impurities are removed enters the raw water tank 103 to heat the raw water with automatic temperature control;

[0057] Here, the heater 110 in the raw water tank 103 will automatically heat the wastewater under the control of the temperature control module 111. This process ensures that the water temperature can meet the requirements of the subsequent membrane distillation process and improves the working efficiency of the membrane distillation component 106.

[0058] S203: The heated water enters the membrane distillation module 106 through the water pump 105, and the water completes vapor-liquid separation inside the membrane distillation module 106, and the gas phase material is produced from the steam outlet of the membrane distillation module 106;

[0059] The membrane distillation module 106 utilizes the selective permeability of the PVDF hydrophobic hollow fiber membrane to allow water to pass through the membrane wall in gaseous form under the pressure difference on both sides of the membrane, thereby achieving separation of water and soluble impurities. The gaseous water vapor is then discharged through the steam outlet of the membrane distillation module 106.

[0060] The water vapor produced by the steam outlet S204 is separated into steam and water by passing through the steam-water separation tank 107;

[0061] In the steam-water separation tank 107, the water vapor and the unevaporated liquid water are further separated to ensure that only pure water vapor enters the next processing step.

[0062] The gas phase S205 is condensed into distilled water in the condenser 108;

[0063] The high-temperature water vapor gradually cools down and finally condenses into distilled water through the cooling effect of the condenser 108. This process not only recycles water resources, but also provides a pure water source for subsequent electrolytic hydrogen production.

[0064] S206 electrolytic cell electrolyzes the distilled water in the liquid storage tank 102 to produce.

[0065] In the electrolyzer, distilled water is used as raw material and decomposed into hydrogen and oxygen under the action of direct current. In this way, through the work flow of the entire sewage and wastewater treatment device, not only the sewage and wastewater are purified, but also hydrogen and oxygen that can be used for other industrial or energy applications are produced.

[0066] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A device for producing hydrogen by in-situ electrolysis of wastewater, comprising a vacuum device, a vacuum tank and a liquid storage tank, wherein the vacuum tank is connected to the liquid storage tank, and the vacuum device is connected to the vacuum tank, characterized in that: It also includes a raw water tank, a self-cleaning filter, a water pump, a membrane distillation component, a steam-water separation tank, a condenser and an electrolytic hydrogen production unit, the condenser is connected to the vacuum tank, the steam-water separation tank is connected to the condenser, the membrane distillation component is connected to the steam-water separation tank, the electrolytic hydrogen production unit is connected to the liquid storage tank, the water pump is connected to the membrane distillation component, the raw water tank is connected to the water pump, and the self-cleaning filter is connected to the raw water tank.

2. The in-situ electrolysis hydrogen production device for wastewater according to claim 1, characterized in that: The raw water tank comprises a water tank body, a heater and a temperature control module. The heater is arranged on one side of the water tank body, and the temperature control module is connected to the heater.

3. The in-situ electrolysis hydrogen production device for wastewater according to claim 2, characterized in that: The self-cleaning filter includes a filter shell, two placement shells, a driving motor, a gear and two racks. The two placement shells are slidably arranged in the filter shell, and the two racks are respectively fixed on the two placement shells. The gear is meshed with the two racks. The output end of the driving motor is fixedly connected to the gear. A filter element is detachably arranged in the filter shell.

4. The in-situ electrolysis hydrogen production device for wastewater according to claim 3, characterized in that: The self-cleaning filter further comprises a baffle, a rotating plate and a driver, wherein the baffle is arranged on one side of the filter housing, the rotating plate is rotatably arranged on one side of the baffle, and the output end of the driver is connected to the rotating plate.

5. The in-situ electrolysis hydrogen production device for wastewater according to claim 4, characterized in that: The self-cleaning filter further comprises an alarm, and the alarm is arranged on the driver.

6. The in-situ electrolysis hydrogen production device for wastewater according to claim 5, characterized in that: The membrane distillation component adopts PVDF hydrophobic hollow fiber membrane.

7. The in-situ electrolysis hydrogen production device for wastewater according to claim 6, characterized in that: The condenser includes a condenser, a heat exchange cavity, a preheating cavity and a circulation pump. The condenser is connected to the vacuum tank and the steam-water separation tank. The heat exchange cavity is arranged outside the condenser, the circulation pump is connected to the heat exchange cavity, and the preheating cavity is arranged at the front end of the raw water tank.

8. The in-situ electrolysis hydrogen production device for wastewater according to claim 7, characterized in that: The condenser further comprises a heat sink, and the heat sink is arranged outside the heat exchange cavity.

9. The in-situ electrolysis hydrogen production device for wastewater according to claim 8, characterized in that: The membrane distillation assembly and the subsequent pipelines are evacuated by a vacuum device.

10. A method for using a wastewater in-situ electrolysis hydrogen production device, using the wastewater in-situ electrolysis hydrogen production device according to any one of claims 1 to 9, It is characterized in that These include: self-cleaning filters to pre-treat wastewater to remove large particles of impurities; After the impurities are removed, the wastewater enters the raw water tank for automatic temperature control and heating; The heated water enters the membrane distillation module through a water pump, and the water completes gas-liquid separation inside the membrane distillation module, and the gas phase material is produced from the steam outlet of the membrane distillation module; The water vapor produced at the steam outlet is separated into steam and water through a steam-water separation tank; The gas phase is condensed into membrane distilled purified water in the condenser; The purified water from membrane distillation is collected in the liquid storage tank; The electrolyzer performs electrolysis reaction on the clean water in the liquid storage tank.

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