Device for producing hydrogen by utilizing wastewater

Abstract

The invention relates to the technical field of hydrogen production, in particular to a device for producing hydrogen by using wastewater. According to the device for producing hydrogen by utilizing the wastewater, the heat exchange mechanism is mounted in the first wastewater treatment tank, so that waste heat generated by electrolysis can be used for removing volatile components in the wastewater, energy recycling is realized, and the hydrogen production cost is effectively reduced; a first exhaust pipe of the first wastewater treatment tank is connected with a waste gas treatment tank, a first liquid outlet pipe is connected with a second wastewater treatment tank, a stirring assembly and a heater are mounted in the second wastewater treatment tank, the second wastewater treatment tank is provided with a second exhaust pipe, and the second exhaust pipe is connected with a condensation mechanism; a liquid discharge pipe of the condensation mechanism is connected with an electrolytic hydrogen production mechanism, the electrolytic hydrogen production mechanism is provided with an electrode assembly, a hydrogen collection mechanism and an oxygen collection mechanism, and the electrode assembly is connected with the heat exchange mechanism, so that hydrogen collection is realized, and oxygen can also be collected.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production, and in particular to a device for producing hydrogen by utilizing wastewater. Background Art

[0002] Hydrogen energy is a clean energy widely found in nature. The volatility and intermittency of renewable energy generation give hydrogen energy unique significance and value. Through the "electricity-hydrogen" conversion, volatile green electricity can be converted into hydrogen energy on a large scale for long-term storage, transportation and energy use, making hydrogen energy likely to occupy an important position in the future energy structure.

[0003] Hydrogen production by water electrolysis is one of the important methods for industrial hydrogen production, especially the preparation of "green hydrogen". It has the advantages of simple principle and clear carbon reduction path. However, all commercial hydrogen production by electrolysis currently uses pure water, which requires huge amounts of fresh water resources and high water treatment costs. How to use low-quality water for hydrogen production by electrolysis is a question worth considering. If industrial wastewater can be used for hydrogen production by electrolysis, while achieving wastewater treatment and reduction and saving fresh water resources, it will generate huge economic and social value. For example, patent number CN201910957388.7 discloses a wastewater hydrogen production device, in which a wastewater storage tank is connected to a reaction component, a cathode and an anode are respectively arranged in a first reaction chamber and a second reaction chamber, a partition net is arranged between the first reaction chamber and the second reaction chamber, a proton exchange membrane is arranged between the partition nets, a reaction component is electrically connected to a power supply, a first gas-liquid separation device is connected to the first reaction chamber, a second gas-liquid separation device is connected to the second reaction chamber, and a hydrogen collector is connected to the reaction chamber where the cathode is located. However, the device has a low energy utilization rate, because the heat generated during the electrolytic hydrogen production process cannot be recycled, resulting in high hydrogen production costs; and low hydrogen production efficiency, low hydrogen production, and other problems. Therefore, this has inhibited the industrial application of wastewater hydrogen production related technologies to a certain extent.

[0004] In view of this, it is very necessary to provide a device for producing hydrogen using wastewater to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a device for producing hydrogen using wastewater.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a device for producing hydrogen using wastewater, comprising a wastewater treatment mechanism, the wastewater treatment mechanism comprising a first wastewater treatment tank, a heat exchange mechanism installed in the wastewater treatment tank, the first wastewater treatment tank is provided with a first liquid inlet pipe, a first liquid outlet pipe and a first exhaust pipe, the first exhaust pipe is connected to a waste gas treatment tank, the first liquid outlet pipe is connected to a second wastewater treatment tank, the second wastewater treatment tank is installed with a stirring component and a heater, the second wastewater treatment tank is provided with a second exhaust pipe, the second exhaust pipe is connected to a condensing mechanism, the discharge pipe of the condensing mechanism is connected to an electrolytic hydrogen production mechanism, the electrolytic hydrogen production mechanism comprises an electrolyzer, an electrode assembly is installed in the electrolyzer, the electrode assembly is connected to the heat exchange mechanism, and the electrolyzer is connected to a hydrogen collection mechanism and an oxygen collection mechanism.

[0007] Furthermore, the first liquid inlet pipe, the first liquid outlet pipe, and the second liquid outlet pipe are all connected with valves.

[0008] Furthermore, the heat exchange mechanism includes a water tank, a circulating self-priming pump is installed at the water outlet of the water tank, a heat exchange pipe is connected to the circulating self-priming pump, and the water outlet end of the heat exchange pipe is connected to the water tank; and the heat exchange pipe is spirally shaped and arranged inside the first wastewater treatment tank.

[0009] Furthermore, the condensation mechanism includes a condenser, the liquid outlet pipe of the condenser is connected to a partition plate, the partition plate is provided with a plurality of holes penetrating the plate body, a flow equalizing tube is inserted in the holes, the flow equalizing tube extends to the end of the tube mouth above the partition plate and is flush; and a filter is provided under the partition plate.

[0010] Furthermore, the stirring assembly includes a motor, the output end of the motor is provided with a rotating shaft, a plurality of support rods are connected to the rotating shaft, the ends of the plurality of support rods are connected with spiral pieces, the spiral pieces gradually expand from the inside to the outside; the spiral pieces are provided with a plurality of through holes.

[0011] Furthermore, the electrode assembly includes an electrode rod, a sleeve is sleeved on the electrode rod, a limiting member for limiting the electrode rod is provided at the connection between the electrode rod and the sleeve, and an adjusting member and an electrode rod fixing frame are provided at the bottom of the sleeve.

[0012] Furthermore, the adjusting member includes a support plate, a first fixed plate and an adjusting rod, the support plate and the first fixed plate are parallel; the adjusting rod passes through and connects the support plate and the first fixed plate in sequence; the first fixed plate is arranged on the periphery of the sleeve and can be sleeved on the sleeve for fixing; and the support plate is provided with a positioning groove, and the positioning groove matches the bottom of the electrode rod.

[0013] Furthermore, the electrode rod fixing frame includes a second fixing plate and a connecting rod, the second fixing plate is sleeved on the electrode rod, and the connecting rod connects the second fixing plate and the sleeve.

[0014] Furthermore, a water inlet pipe and a water outlet pipe are provided below the sleeve, and the water inlet pipe and the water outlet pipe are connected to the heat exchange mechanism.

[0015] Furthermore, the hydrogen collecting mechanism includes a hydrogen separator, to which a hydrogen storage tank is connected; the oxygen collecting mechanism includes an oxygen separator, to which an oxygen storage tank is connected, and the hydrogen collecting mechanism is arranged above the oxygen collecting mechanism.

[0016] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present application sets a heat exchange mechanism in the first wastewater treatment tank, and the heat exchange mechanism is connected to the electrode assembly, so that the waste heat generated by electrolysis can be used to remove volatile components in the wastewater, thereby realizing energy recycling and effectively reducing the cost of hydrogen production.

[0018] 2. The present application arranges a stirring assembly, a heater, and a filter in the second wastewater treatment tank, and connects a condensing mechanism to the second exhaust pipe of the second wastewater treatment tank, and installs a filter under the condensing mechanism, so that pure water can be obtained from the treated wastewater, thereby ensuring the purity of subsequent hydrogen production and realizing the recycling of wastewater.

[0019] 3. The present application installs an electrode assembly in the electrolytic cell, wherein the electrode assembly includes an electrode rod, the electrode rod is sleeved with a sleeve, a limiter for limiting the electrode rod is provided at the connection between the electrode rod and the sleeve, and an adjustment member and an electrode rod fixing frame are provided at the bottom of the sleeve, thereby facilitating the replacement of the electrode rod and improving the efficiency of hydrogen production.

[0020] 4. This application connects a hydrogen collection mechanism and an oxygen collection machine to the electrolyzer, thereby not only collecting hydrogen but also collecting oxygen. When the oxygen is not used for back-end sales, it can be further introduced into wastewater to accelerate the rate of pure water replenishment into the electrolyte and improve system efficiency.

[0021] 5. The device for producing hydrogen from wastewater in this application has a simple structure, wide adaptability, and can be used on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a device for producing hydrogen using wastewater in a preferred embodiment of the present invention;

[0023] Figure 2It is a structural schematic diagram of a stirring assembly in a preferred embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a condensation component in a preferred embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the structure of the electrode assembly in a preferred embodiment of the present invention.

[0026] Figure numerals: 1. first wastewater treatment tank; 2. heat exchange mechanism; 201. water storage tank; 202. circulating self-priming pump; 203. heat exchange tube; 3. condenser; 4. second wastewater treatment tank; 5. stirring assembly; 501. motor; 502. rotating shaft; 503. support rod; 504. spiral sheet; 505. through hole; 6. filter; 7. electrolytic cell; 8. electrode rod; 9. sleeve; 10; adjusting member; 1001. support plate; 1002. first fixed plate; 1003. adjusting rod; 11. electrode rod fixing frame; 1101. second fixed plate; 1102. connecting rod; 12. hydrogen separator; 13. hydrogen storage tank; 14. oxygen separator; 15. oxygen storage tank; 16. partition plate; 17. flow equalizing pipe; 18. heater; 19. filter; 20. waste gas treatment tank. DETAILED DESCRIPTION

[0027] The technical solutions in the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 can be understood according to specific circumstances.

[0029] Reference Figure 1-Figure 4As shown, a preferred embodiment of the present invention is a device for producing hydrogen using wastewater, comprising a wastewater treatment mechanism, wherein the wastewater treatment mechanism comprises a first wastewater treatment tank 1, wherein a heat exchange mechanism 2 is installed in the wastewater treatment tank 1, so that the waste heat generated by electrolysis can be used to remove volatile components in the wastewater, thereby realizing energy recycling and effectively reducing the cost of hydrogen production; the first wastewater treatment tank 1 is provided with a first liquid inlet pipe, a first liquid outlet pipe and a first exhaust pipe, the first exhaust pipe is connected to a waste gas treatment tank 20, the first liquid outlet pipe is connected to a second wastewater treatment tank 4, and a stirring assembly 5 is installed in the second wastewater treatment tank 4 , heater 18, a second exhaust pipe is provided on the second wastewater treatment tank 4, the second exhaust pipe is connected with a condensing mechanism, the discharge pipe of the condensing mechanism is connected with an electrolytic hydrogen production mechanism, the electrolytic hydrogen production mechanism includes an electrolytic cell 7, an electrode assembly is installed in the electrolytic cell 7, the electrode assembly is connected to the heat exchange mechanism 2, the electrolytic cell 7 is connected with a hydrogen collecting mechanism and an oxygen collecting mechanism, which can not only collect hydrogen but also collect oxygen, and the oxygen can be further introduced into the wastewater when not used for back-end sale, so as to accelerate the rate of replenishment of pure water into the electrolyte and improve the system efficiency.

[0030] As a preferred embodiment of the present invention, it may also have the following additional technical features: valves are connected to the first liquid inlet pipe, the first liquid outlet pipe, and the liquid discharge pipe of the condensing mechanism, thereby facilitating the control of the flow rates of the first liquid inlet pipe, the first liquid outlet pipe, and the liquid discharge pipe of the condensing mechanism.

[0031] In this embodiment, the heat exchange mechanism 2 includes a water tank 201, a circulating self-priming pump 202 is installed at the water outlet of the water tank 201, a heat exchange tube 203 is connected to the circulating self-priming pump 202, and the water outlet end of the heat exchange tube 203 is connected to the water tank 201; and the heat exchange tube 203 is spiral and arranged inside the first wastewater treatment tank 1. In this way, the wastewater can be heated and the volatile substances in the wastewater can be removed.

[0032] In this embodiment, the condensation mechanism includes a condenser 3, a partition plate 16 is connected to the liquid outlet pipe of the condenser 3, a plurality of plug holes penetrating the plate body are provided on the partition plate 16, a flow equalizing tube 17 is inserted into the plug hole, and the end of the flow equalizing tube 17 extending to the top of the partition plate is flush; and a filter 6 is provided below the partition plate 16. Thus, pure water can be obtained through the condensation mechanism for electrolytic hydrogen production operation.

[0033] In this embodiment, the stirring assembly 5 includes a motor 501, and a rotating shaft 502 is provided at the output end of the motor 501, and a plurality of supporting rods 503 are connected to the rotating shaft 502, and the ends of the plurality of supporting rods 503 are connected to spiral pieces 504, and the spiral pieces 504 gradually expand from the inside to the outside; and a plurality of through holes 505 are provided on the spiral pieces 504. Thus, the wastewater can be fully and evenly mixed, and the volatilization of water vapor is accelerated, so as to obtain pure water for subsequent electrolytic hydrogen production operation.

[0034] In this embodiment, the electrode assembly includes an electrode rod 8, on which a sleeve 9 is sleeved, a limiter 10 for limiting the electrode rod is provided at the connection between the electrode rod 8 and the sleeve 9, and an adjusting member 10 and an electrode rod fixing frame 11 are provided at the bottom of the sleeve 9; the adjusting member 10 includes a support plate 1001, a first fixing plate 1002 and an adjusting rod 1003, and the support plate 1001 and the first fixing plate 1002 are parallel; the adjusting rod 1003 passes through and connects the support plate 1001 and the first fixing plate 1002 in sequence; the first fixing plate 1002 is arranged on the periphery of the sleeve 9, and can be sleeved on the sleeve 9 for fixing; and the support plate 1001 is provided with a positioning groove, and the positioning groove matches the bottom of the electrode rod 8. Therefore, by adjusting the up and down position of the adjusting rod 1003, the up and down position of the supporting plate 1001 can be driven, thereby realizing the position adjustment of the electrode rod 8, which is beneficial to the reuse of the electrode rod 8, not only improving the utilization rate of the electrode rod 8, but also extending the service life of the electrode rod 8.

[0035] In this embodiment, the electrode rod fixing frame 11 includes a second fixing plate 1101 and a connecting rod 1102, wherein the second fixing plate 1101 is sleeved on the electrode rod 8, and the connecting rod 1102 connects the second fixing plate 1101 and the sleeve 9. Thus, the electrode rod fixing frame 11 can fix and position the electrode rod 8, so that during operation, the position of the electrode rod 8 will not change with the flow of the electrolyte.

[0036] In this embodiment, a water inlet pipe and a water outlet pipe are provided below the sleeve 9, and the water inlet pipe and the water outlet pipe are connected to the heat exchange mechanism 2. Therefore, after the electrode rod 8 is cooled by cold water entering through the water inlet pipe, the hot water is discharged by the water outlet pipe, forming an efficient water cooling cycle, effectively cooling and protecting the electrode rod 8, and further extending the service life of the electrode rod 8.

[0037] In this embodiment, the hydrogen collecting mechanism includes a hydrogen separator 12, and the hydrogen separator 12 is connected to a hydrogen storage tank 13; the oxygen collecting mechanism includes an oxygen separator 14, and the oxygen separator 14 is connected to an oxygen storage tank 15, and the hydrogen collecting mechanism is arranged above the oxygen collecting mechanism. That is, when hydrogen production starts, the electrolyte in the electrolytic cell 7 undergoes an oxidation-reduction reaction to generate hydrogen and oxygen. If the electrolytic cell 7 is an alkaline electrolytic cell or an AEM (anion exchange membrane) electrolytic cell, the electrolyte first undergoes a reduction hydrogen evolution reaction at the cathode, and the generated OH - The electrolyte enters the anode through the diaphragm or anion exchange membrane and undergoes an oxidation reaction to produce oxygen. If the electrolyzer 7 is a PEM (proton exchange membrane) electrolyzer, the electrolyte now undergoes an oxidation oxygen evolution reaction at the anode to produce H + It enters the cathode through the proton exchange membrane and undergoes a reduction reaction to produce hydrogen. The hydrogen and oxygen produced enter the hydrogen separator 12 and the oxygen separator 14 respectively. This process separates the produced hydrogen and oxygen from the mixed electrolyte or water. The separated hydrogen and oxygen enter the hydrogen storage tank 13 and the oxygen storage tank 15 respectively, thereby achieving full utilization of the wastewater. At the same time, the hydrogen and oxygen pipelines contain a one-way valve to prevent the produced hydrogen and oxygen from flowing back.

[0038] The working principle of the present invention is as follows: a high-temperature electrolyte of a non-pure aqueous solution enters a heat exchange mechanism 2 in a first wastewater treatment tank 1, and the wastewater is heated by exchanging heat with surrounding wastewater, and volatiles in the wastewater are removed; the volatiles are collected by a waste gas treatment tank 20 and then centrally treated; when the wastewater obtained from the first liquid outlet pipe of the first wastewater treatment tank 1 does not contain volatiles, or when the volatiles are as low as a set concentration, the first liquid outlet pipe is opened to allow the pre-treated wastewater to enter the second wastewater treatment tank 4, and the first liquid inlet pipe is opened to replace a new batch of wastewater for treatment;

[0039] The wastewater treated with volatiles enters the second wastewater treatment tank 4, and under the action of the stirring component 5, the heater 17, the condensing mechanism, and the filter 19, pure water is obtained, and the pure water is discharged to the electrolytic cell 7 through the second drain pipe on the second wastewater treatment tank for electrolytic hydrogen production. At the same time, the waste heat generated during the electrolysis process is used to remove volatile components in the wastewater, thereby realizing energy recovery and effectively reducing the cost of hydrogen production.

[0040] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0041] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A device for producing hydrogen using wastewater, characterized in that: The invention comprises a wastewater treatment mechanism, wherein the wastewater treatment mechanism comprises a first wastewater treatment tank, a heat exchange mechanism is installed in the first wastewater treatment tank, a first liquid inlet pipe, a first liquid outlet pipe and a first exhaust pipe are provided on the first wastewater treatment tank, the first exhaust pipe is connected to a waste gas treatment tank, the first liquid outlet pipe is connected to a second wastewater treatment tank, a stirring component and a heater are installed in the second wastewater treatment tank, a second exhaust pipe is provided on the second wastewater treatment tank, a condensation mechanism is connected to the second exhaust pipe, an electrolytic hydrogen production mechanism is connected to the liquid discharge pipe of the condensation mechanism, the electrolytic hydrogen production mechanism comprises an electrolyzer, an electrode assembly is installed in the electrolyzer, the electrode assembly is connected to the heat exchange mechanism, and the electrolyzer is connected to a hydrogen collection mechanism and an oxygen collection mechanism.

2. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The first liquid inlet pipe, the first liquid outlet pipe and the second liquid outlet pipe are all connected with valves.

3. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The heat exchange mechanism includes a water tank, a circulating self-priming pump is installed at the water outlet of the water tank, a heat exchange pipe is connected to the circulating self-priming pump, and the water outlet end of the heat exchange pipe is connected to the water tank; and the heat exchange pipe is spiral and arranged inside the first wastewater treatment tank.

4. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The condensation mechanisms all include a condenser, the liquid outlet pipe of the condenser is connected to a partition plate, the partition plate is provided with a plurality of insertion holes penetrating the plate body, a flow equalizing tube is inserted into the insertion holes, the flow equalizing tube extends to the end of the tube mouth above the partition plate and is flush; and a filter is provided under the partition plate.

5. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The stirring assembly comprises a motor, the output end of the motor is provided with a rotating shaft, the rotating shaft is connected with a plurality of supporting rods, the ends of the plurality of supporting rods are connected with spiral pieces, the spiral pieces gradually expand from the inside to the outside; the spiral pieces are provided with a plurality of through holes.

6. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The electrode assembly comprises an electrode rod, a sleeve is sleeved on the electrode rod, a limiting piece for limiting the electrode rod is provided at the connection between the electrode rod and the sleeve, and an adjusting piece and an electrode rod fixing frame are provided at the bottom of the sleeve.

7. The device for producing hydrogen from wastewater according to claim 6, characterized in that: The adjusting member includes a support plate, a first fixed plate and an adjusting rod, wherein the support plate and the first fixed plate are parallel to each other; the adjusting rod passes through and connects the support plate and the first fixed plate in sequence; the first fixed plate is arranged on the periphery of the sleeve and can be sleeved on the sleeve for fixing; and the support plate is provided with a positioning groove, which matches the bottom of the electrode rod.

8. The device for producing hydrogen from wastewater according to claim 6, characterized in that: The electrode rod fixing frame comprises a second fixing plate and a connecting rod, wherein the second fixing plate is sleeved on the electrode rod, and the connecting rod connects the second fixing plate and the sleeve.

9. The device for producing hydrogen from wastewater according to claim 6, characterized in that: A water inlet pipe and a water outlet pipe are provided below the sleeve, and the water inlet pipe and the water outlet pipe are connected to the heat exchange mechanism.

10. The device for producing hydrogen from wastewater according to claim 1, characterized in that: The hydrogen collecting mechanism comprises a hydrogen separator, and a hydrogen storage tank is connected to the hydrogen separator; the oxygen collecting mechanism comprises an oxygen separator, and an oxygen storage tank is connected to the oxygen separator, and the hydrogen collecting mechanism is arranged above the oxygen collecting mechanism.

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