Seawater electrolysis hydrogen production system

Abstract

The invention discloses a seawater electrolysis hydrogen production system, and relates to the technical field of seawater hydrogen production, the seawater electrolysis hydrogen production system comprises a separation module, a flow adjusting module, an electrolysis module and a waste liquid treatment module, the water outlet position of the waste liquid treatment module is connected with a seawater outlet, and the water inlet position of the separation module is connected with a seawater inlet; a seawater pump is arranged in the seawater outlet, and a reverse osmosis membrane is arranged in the separation module. According to the seawater electrolysis hydrogen production system, impurities and water in seawater can be separated through the reverse osmosis membrane arranged in the separation module, seawater pretreatment is achieved, discharged seawater cannot be interfered by too many impurities, hydrogen with higher quality can be conveniently produced, and the hydrogen production efficiency is improved. The seawater also contains a small amount of untreated chloride ions, the chloride ions react in the anode to release chlorine, and the chlorine is collected by the chlorine collecting device to prevent the chlorine from being directly discharged into the atmosphere to cause pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production from seawater, and in particular to a hydrogen production system by electrolyzing seawater. Background Art

[0002] Seawater electrolysis is a technology that uses water molecules in seawater to produce hydrogen through electrolysis. It can be seen as an alternative solution to renewable energy because seawater is relatively abundant and hydrogen is a clean energy source.

[0003] For example, the Chinese patent with publication number CN217857673U discloses a system for producing hydrogen by electrolysis of seawater, comprising: an electrolyzer; a seawater storage tank device connected to the seawater inlet and the seawater outlet of the electrolyzer; a waste liquid storage tank device connected to the waste liquid outlet of the electrolyzer; and an acid liquid storage tank device connected to the acid liquid inlet of the electrolyzer; the electrolyzer comprises an electrolysis hydrogen production unit, the electrolysis hydrogen production unit comprises a cathode, an anode and a diaphragm; a first acid liquid pump and a second acid liquid pump are arranged in parallel between the outlet of the acid liquid storage tank device and the acid liquid inlet of the electrolyzer, the first acid liquid pump is connected to the cathode of the electrolyzer, and the second acid liquid pump is connected to the anode of the electrolyzer. The system for producing hydrogen by electrolysis of seawater utilizes pulse impulse and the corrosive effect of high-concentration acid to wash the cathode and the anode alternately, which can avoid the formation of a scaling layer on the active site of the electrolyzer and maintain high electrolysis hydrogen production activity.

[0004] The existing technology has the following problems:

[0005] In the existing process of hydrogen production by electrolysis of seawater, the discharged seawater cannot be pretreated, which causes impurities in the seawater to easily affect the electrolysis effect, resulting in poor quality of the produced hydrogen. In addition, a certain amount of chlorine will be produced in the existing process of hydrogen production by electrolysis of seawater. The discharge of chlorine into the air will cause certain atmospheric pollution. At the same time, after the existing hydrogen production by electrolysis of seawater is completed, the waste liquid cannot be deeply cleaned, and direct discharge is likely to cause certain water pollution. Summary of the invention

[0006] The present invention provides a system for producing hydrogen by electrolyzing seawater to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A seawater electrolysis hydrogen production system comprises a separation module, a flow regulation module, an electrolysis module and a waste liquid treatment module, wherein the water outlet of the waste liquid treatment module is connected to a seawater outlet, the water inlet of the separation module is connected to a seawater inlet, and a seawater pump is arranged in the seawater outlet.

[0009] Preferably, a reverse osmosis membrane is provided in the separation module, one side of the reverse osmosis membrane is connected to the water inlet of the waste liquid treatment module, and the other side of the reverse osmosis membrane is connected to the inlet of the flow regulating module.

[0010] Preferably: a water-gas linkage valve is provided in the flow regulating module, and the water outlet of the flow regulating module is connected to the water inlet of the electrolysis module.

[0011] Preferably, an ion selective membrane is provided in the electrolysis module, a cathode electrode is provided on one side of the ion selective membrane, and an anode electrode is provided on the other side of the ion selective membrane.

[0012] Preferably: the water outlets of the anode electrode and the cathode electrode are both provided with water stop valves, and the water outlets of the water stop valves are connected to the water inlet of the waste liquid treatment module.

[0013] Preferably: one side of the cathode electrode is connected to a hydrogen collecting device, and one side of the anode electrode is connected to an oxygen collecting device and a chlorine collecting device.

[0014] Preferably: the water outlet of the waste liquid treatment module is connected to the water inlet of the seawater outlet, an activated carbon adsorption device is provided in the waste liquid treatment module, and an ultraviolet irradiation device is provided in the waste liquid treatment module.

[0015] The seawater electrolysis hydrogen production system includes the following process:

[0016] Step 1: Seawater is discharged into the separation module through the seawater inlet;

[0017] Step 2: The separation module pre-treats the seawater, discharges the water into the electrolysis module, and discharges the separation liquid into the waste liquid treatment module;

[0018] Step 3: The electrolysis module performs an electrolysis reaction on the water, collects the produced gas, and discharges the produced waste liquid into the waste liquid treatment module;

[0019] Step 4: The waste liquid treatment module deeply cleans the discharged waste liquid and discharges the waste liquid through the seawater outlet.

[0020] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0021] 1. The present invention provides a system for producing hydrogen by electrolyzing seawater. The reverse osmosis membrane arranged in the separation module can separate impurities and water in the seawater, so as to pre-treat the seawater and prevent the discharged seawater from being disturbed by too many impurities, so as to produce higher quality hydrogen.

[0022] 2. The present invention provides a system for producing hydrogen by electrolyzing seawater. A small amount of untreated chloride ions are contained in the seawater. The chloride ions react in the anode to release chlorine gas. The chlorine gas is collected by a chlorine gas collection device to prevent the chlorine gas from being directly discharged into the atmosphere to cause pollution.

[0023] 3. The present invention provides a seawater electrolysis hydrogen production system. The activated carbon adsorption equipment arranged in the waste liquid treatment module can further remove the difficult-to-degrade organic matter and pollutants in the waste liquid. At the same time, the ultraviolet irradiation equipment arranged can disinfect the waste liquid to ensure that the bacterial indicators meet the emission standards, thereby effectively preventing water pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the process flow of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] A seawater electrolysis hydrogen production system comprises a separation module, a flow regulation module, an electrolysis module and a waste liquid treatment module. The water outlet of the waste liquid treatment module is connected to a seawater outlet, the water inlet of the separation module is connected to a seawater inlet, and a seawater pump is arranged in the seawater outlet.

[0027] It should be noted that the separation module can separate impurities and moisture in seawater, the flow regulation module can detect the water pressure difference and control the water flow to achieve better flow control, the electrolysis module will complete the electrolysis reaction of seawater and collect the produced gas, and the waste liquid treatment module can deeply treat the waste liquid to effectively prevent water pollution.

[0028] like Figure 1 As shown, a reverse osmosis membrane is provided in the separation module, one side of the reverse osmosis membrane is connected to the water inlet of the waste liquid treatment module, and the other side of the reverse osmosis membrane is connected to the inlet of the flow regulating module.

[0029] It should be noted that the reverse osmosis membrane can separate impurities and water in seawater. The separated liquid will be discharged into the waste liquid treatment module through the high-pressure side, and the separated seawater will be discharged into the electrolysis module through the low-pressure side.

[0030] like Figure 1 As shown, a water-gas linkage valve is provided in the flow regulating module, and the water outlet of the flow regulating module is connected to the water inlet of the electrolysis module.

[0031] It should be noted that the water-gas linkage valve is a device for controlling water flow. It controls the opening and closing of the valve by detecting the water pressure difference, thereby controlling the water flow. The water-gas linkage valve is usually composed of a valve, a regulator and a sensor. The regulator monitors the changes in the water pressure difference and controls the opening and closing of the valve. The sensor is used to detect the opening of the valve, thereby feedbacking the water flow information to achieve better flow control.

[0032] like Figure 1 As shown, an ion selective membrane is arranged in the electrolysis module, a cathode electrode is arranged on one side of the ion selective membrane, and an anode electrode is arranged on the other side of the ion selective membrane.

[0033] It should be noted that the ion selective membrane uses a thin film with a specific pore size and space device to separate the positive ions and negative ions in seawater. A cathode electrode and an anode electrode are arranged in the electrolysis module. The cathode electrode and the anode electrode are located on both sides of the ion selective membrane. The cations in the seawater will pass through the ion selective membrane and be guided to the cathode, and the anions in the seawater will be blocked by the ion selective membrane.

[0034] like Figure 1 As shown, water outlets of the anode electrode and the cathode electrode are both provided with water stop valves, and the water outlets of the water stop valves are connected to the water inlet of the waste liquid treatment module.

[0035] It should be noted that the water stop valve is closed so that the electrolysis module can carry out the electrolysis reaction normally, and the water stop valve is opened so that the waste liquid can be discharged.

[0036] like Figure 1 As shown, one side of the cathode electrode is connected to a hydrogen collection device, and one side of the anode electrode is connected to an oxygen collection device and a chlorine collection device.

[0037] It should be noted that oxygen and hydrogen are collected by an oxygen collecting device and a hydrogen collecting device respectively, and chlorine is collected by a chlorine collecting device at the same time to prevent chlorine from being directly discharged into the atmosphere to cause pollution.

[0038] like Figure 1 As shown, the water outlet of the waste liquid treatment module is connected to the water inlet of the seawater outlet, an activated carbon adsorption device is provided in the waste liquid treatment module, and an ultraviolet irradiation device is provided in the waste liquid treatment module.

[0039] It should be noted that an activated carbon adsorption device is installed in the waste liquid treatment module, which can further remove the difficult-to-degrade organic matter and pollutants in the waste liquid. At the same time, the ultraviolet irradiation equipment can disinfect the waste liquid to ensure that the bacterial indicators meet the emission standards, effectively preventing water pollution.

[0040] The seawater electrolysis hydrogen production system includes the following processes:

[0041] Step 1: Seawater is discharged into the separation module through the seawater inlet;

[0042] Step 2: The separation module pre-treats the seawater, discharges the water into the electrolysis module, and discharges the separation liquid into the waste liquid treatment module;

[0043] Step 3: The electrolysis module performs an electrolysis reaction on the water, collects the produced gas, and discharges the produced waste liquid into the waste liquid treatment module;

[0044] Step 4: The waste liquid treatment module deeply cleans the discharged waste liquid and discharges the waste liquid through the seawater outlet.

[0045] The working principle of the present invention is as follows: a seawater pump is arranged at the seawater inlet. The seawater pump is a device specially used for extracting, transporting and treating seawater. Starting the seawater pump will drive the seawater to be discharged into the separation module. A reverse osmosis membrane is arranged in the separation module. The reverse osmosis membrane can separate impurities and water in the seawater. The separated separation liquid will be discharged into the waste liquid treatment module through the high-pressure side, and the separated seawater will be discharged into the electrolysis module through the low-pressure side. A flow regulating module is arranged between the separation module and the electrolysis module, in which a water-gas linkage valve is arranged. The water-gas linkage valve is a device for controlling water flow. The water flow is controlled by detecting the water pressure difference to control the opening and closing of the valve. The water-gas linkage valve is usually composed of a valve, a regulator and a sensor. The regulator monitors the change of the water pressure difference and controls the opening and closing of the valve. The sensor is used to detect the opening of the valve, thereby feeding back the water flow information to achieve better flow control. An ion selective membrane is arranged in the electrolysis module. The ion selective membrane uses a thin film with a specific pore size and space device to separate the positive ions and negative ions in seawater. A cathode electrode and an anode electrode are arranged in the electrolysis module. The cathode electrode and the anode electrode are located on both sides of the ion selective membrane. The cations in the seawater are separated by the membrane. The electrons will pass through the ion selective membrane and be guided to the cathode, and the anions in the seawater will be blocked by the ion selective membrane and guided to the anode. At the same time, an alkaline electrolytic solution is added to the electrolysis module. Through the voltage difference between the anode and the cathode, the water molecules in the seawater lose electrons at the anode and become oxygen atoms, and then the two oxygen atoms combine to release oxygen. At the same time, at the cathode, the water molecules in the seawater gain electrons and become hydrogen atoms, and then the two hydrogen atoms combine to release hydrogen. Oxygen and hydrogen are collected by oxygen collection devices and hydrogen collection devices respectively. At the same time, the seawater also contains a small amount of untreated chloride ions. Chlorine ions react in the anode and release chlorine gas, which is collected by a chlorine collection device to prevent it from being directly discharged into the atmosphere and causing pollution. The two water stop valves are then opened to make the electrolysis module and the waste liquid treatment module the same. The waste liquid after electrolysis will be discharged into the waste liquid treatment module. An activated carbon adsorption device is provided in the waste liquid treatment module to further remove the difficult-to-degrade organic matter and pollutants in the waste liquid. At the same time, the ultraviolet irradiation equipment can disinfect the waste liquid to ensure that the bacterial indicators meet the emission standards, effectively preventing water pollution. The waste liquid treatment module then discharges the treated seawater through the seawater inlet.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A system for producing hydrogen by electrolyzing seawater, characterized in that: The seawater electrolysis hydrogen production system comprises a separation module, a flow regulating module, an electrolysis module and a waste liquid treatment module. The water outlet of the waste liquid treatment module is connected to a seawater outlet, the water inlet of the separation module is connected to a seawater inlet, and a seawater pump is arranged in the seawater outlet.

2. A system for producing hydrogen by electrolysis of seawater according to claim 1, characterized in that: A reverse osmosis membrane is arranged in the separation module, one side of the reverse osmosis membrane is connected to the water inlet of the waste liquid treatment module, and the other side of the reverse osmosis membrane is connected to the inlet of the flow regulating module.

3. A system for producing hydrogen by electrolysis of seawater according to claim 1, characterized in that: The flow regulating module is provided with a water-gas linkage valve, and the water outlet of the flow regulating module is connected to the water inlet of the electrolysis module.

4. A system for producing hydrogen by electrolysis of seawater according to claim 1, characterized in that: An ion selective membrane is arranged in the electrolysis module, a cathode electrode is arranged on one side of the ion selective membrane, and an anode electrode is arranged on the other side of the ion selective membrane.

5. A system for producing hydrogen by electrolysis of seawater according to claim 4, characterized in that: The water outlets of the anode electrode and the cathode electrode are both provided with water stop valves, and the water outlets of the water stop valves are connected to the water inlet of the waste liquid treatment module.

6. A system for producing hydrogen by electrolysis of seawater according to claim 4, characterized in that: One side of the cathode electrode is connected to a hydrogen collecting device, and one side of the anode electrode is connected to an oxygen collecting device and a chlorine collecting device.

7. A system for producing hydrogen by electrolysis of seawater according to claim 1, characterized in that: The water outlet of the waste liquid treatment module is connected to the water inlet of the seawater outlet, the waste liquid treatment module is provided with an activated carbon adsorption device, and the waste liquid treatment module is provided with an ultraviolet irradiation device.

8. The system for producing hydrogen by electrolysis of seawater according to claim 1, characterized in that: The seawater electrolysis hydrogen production system includes the following process: Step 1: Seawater is discharged into the separation module through the seawater inlet; Step 2: The separation module pre-treats the seawater, discharges the water into the electrolysis module, and discharges the separation liquid into the waste liquid treatment module; Step 3: The electrolysis module performs an electrolysis reaction on the water, collects the produced gas, and discharges the produced waste liquid into the waste liquid treatment module; Step 4: The waste liquid treatment module deeply cleans the discharged waste liquid and discharges the waste liquid through the seawater outlet.

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