A high and low temperature electrolyzed water hydrogen production and hydrogen storage coupling device and method

Abstract

The present invention relates to a high-low temperature electrolyzed water hydrogen production and hydrogen storage coupling device. The pure water electrolysis hydrogen production system is connected to a first DC power supply to start the hydrogen production of the pure water electrolysis hydrogen production system by turning on the first DC power supply. The high temperature electrolysis hydrogen production system is connected to a second DC power supply to start the hydrogen production of the high temperature electrolysis hydrogen production system by turning on the second DC power supply. The first outlet pipeline of the pure water electrolysis hydrogen production system is directly connected to the purification device. The second outlet pipeline of the pure water electrolysis hydrogen production system is connected to the main gas path inlet of the ejector. The high temperature electrolysis hydrogen production system is connected to the side gas path inlet of the ejector. The common gas outlet of the ejector is connected to the purification device. The hydrogen storage bottle group is respectively connected to the purification device and the high temperature electrolysis hydrogen production system. The present invention also relates to a high-low temperature electrolyzed water hydrogen production and hydrogen storage coupling method. According to the high-low temperature electrolyzed water hydrogen production and hydrogen storage coupling device and method of the present invention, the power consumption required to generate the same amount of hydrogen is reduced, and the hydrogen production power consumption is lowered.

Description

Technical Field

[0001] The present invention relates to hydrogen production by electrolysis of water, and more particularly to a high-low temperature electrolytic water hydrogen production and storage coupling device and method. Background Art

[0002] Hydrogen production by electrolysis of water technology has received wide attention due to its advantages such as simple process, high purity of the obtained hydrogen, and easy availability of raw materials. According to different working temperatures, the existing electrolytic water hydrogen production technologies are divided into high-temperature electrolytic water hydrogen production technology and low-temperature electrolytic water hydrogen production technology.

[0003] High-temperature electrolytic water hydrogen production technology is also called SOEC electrolytic water hydrogen production technology, and its working temperature is generally between 500°C and 1000°C, with high electrolytic hydrogen production efficiency. However, the core equipment of the high-temperature hydrogen production system, the electrolytic cell, has low strength, resulting in the outlet pressure of the high-temperature hydrogen production system generally not exceeding 0.2 MPa. Therefore, a large electric-driven hydrogen pre-booster device needs to be invested before hydrogen storage, and it has not been commercially applied yet.

[0004] The currently commercially applied electrolytic water hydrogen production technology is low-temperature electrolytic water hydrogen production technology, which is generally divided into pure water hydrogen production technology (also called PEMEC hydrogen production technology) and alkaline electrolytic water hydrogen production technology. The characteristics of these two technologies are that the working pressure can reach 3 MPa. The working temperature of pure water hydrogen production technology generally remains around 65°C, and the working temperature of alkaline electrolytic water hydrogen production technology generally remains around 85°C. In addition, the pure water hydrogen production technology requires a short start-up stabilization time, and the produced hydrogen has less water content and higher gas purity. However, the electrolytic hydrogen production efficiency of low-temperature electrolytic water hydrogen production technology is relatively low. Summary of the Invention

[0005] In order to solve the problems that the high-temperature electrolytic water hydrogen production technology in the above-mentioned prior art cannot be commercialized and the electrolytic hydrogen production efficiency of the low-temperature electrolytic water hydrogen production technology is relatively low, the present invention provides a high-low temperature electrolytic water hydrogen production and storage coupling device and method.

[0006] The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to the present invention includes a pure water electrolytic hydrogen production system, a first DC power supply, a high-temperature electrolytic hydrogen production system, a second DC power supply, an ejector, a purification device, and a hydrogen storage bottle group. Among them, the pure water electrolytic hydrogen production system is connected to the first DC power supply to start the hydrogen production of the pure water electrolytic hydrogen production system by turning on the first DC power supply. The high-temperature electrolytic hydrogen production system is connected to the second DC power supply to start the hydrogen production of the high-temperature electrolytic hydrogen production system by turning on the second DC power supply. The pure water electrolytic hydrogen production system has a first outlet pipeline and a second outlet pipeline. The first outlet pipeline is directly connected to the purification device. The ejector has a main gas path inlet, a side gas path inlet, and a common gas outlet. The second outlet pipeline of the pure water electrolytic hydrogen production system is connected to the main gas path inlet of the ejector. The high-temperature electrolytic hydrogen production system is connected to the side gas path inlet of the ejector. The common gas outlet of the ejector is connected to the purification device. The hydrogen storage bottle group is respectively connected to the purification device and the high-temperature electrolytic hydrogen production system.

[0007] Preferably, the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a hydrogen-using device. Among them, the inlet of the hydrogen storage bottle group is connected to the purification device, and the outlet of the hydrogen storage bottle group is respectively connected to the high-temperature electrolytic hydrogen production system and the hydrogen-using device.

[0008] Preferably, the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a valve group. Among them, the hydrogen storage bottle group is respectively connected to the high-temperature electrolytic hydrogen production system and the hydrogen-using device through the valve group to distribute the gas in the hydrogen storage bottle group.

[0009] Preferably, the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes an electric-driven hydrogen gas booster device. Among them, the hydrogen storage bottle group is connected to the purification device through the electric-driven hydrogen gas booster device.

[0010] Preferably, the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a pure water supply system, which is respectively connected to the pure water electrolytic hydrogen production system and the high-temperature electrolytic hydrogen production system to supply water to the pure water electrolytic hydrogen production system and the high-temperature electrolytic hydrogen production system respectively.

[0011] The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling method according to the present invention includes the following steps: S1. At the initial startup, the second DC power supply is disconnected, and the preheating device in the high-temperature electrolytic hydrogen production system starts to heat up. The first DC power supply is energized, and the hydrogen produced by the pure water electrolytic hydrogen production system directly enters the purification device through the first outlet pipeline and is stored in the hydrogen storage bottle group. S2. Part of the gas in the hydrogen storage bottle group is introduced into the high-temperature electrolytic hydrogen production system as a protective gas. The second DC power supply is energized, and the hydrogen produced by the high-temperature electrolytic hydrogen production system enters the side gas path of the ejector. The hydrogen produced by the pure water electrolytic hydrogen production system enters the main gas path of the ejector through the second outlet pipeline. The mixed gas enters the purification device through the common gas outlet of the ejector and is then stored in the hydrogen storage bottle group.

[0012] It should be understood that when the first DC power supply is powered on, that is, the pure water electrolysis hydrogen production system is started, the pure water electrolysis hydrogen production system can achieve stable operation within 1 hour.

[0013] Preferably, the second DC power supply is powered on after the preheating device in the high-temperature electrolysis hydrogen production system is heated to the operating temperature.

[0014] Preferably, the gas in the hydrogen storage bottle group is distributed through a valve group, a part of which enters the high-temperature electrolysis hydrogen production system to be used as a protective gas, and the other part enters the hydrogen-using equipment for utilization.

[0015] Preferably, the pressure of the main gas path of the pure water electrolysis hydrogen production system entering the ejector through the second outlet pipeline is adjusted within 0-3MPa (especially 1MPa-3MPa) to control the pressure of the common gas outlet of the ejector.

[0016] Preferably, the pressure of the side gas path entering the ejector of the high-temperature electrolysis hydrogen production system is between 0.01MPa and 0.2MPa, and the pressure of the common gas outlet of the ejector is between the pressures of the main gas path and the side gas path.

[0017] The high-low temperature water electrolysis hydrogen production and storage coupling device and method according to the present invention simultaneously covers high temperature and low temperature water electrolysis hydrogen production and storage technologies, combining the high hydrogen production efficiency of the high temperature electrolysis hydrogen production system and the high outlet pressure of the pure water electrolysis hydrogen production system, so that the power consumption required to produce the same amount of hydrogen is reduced, and the overall hydrogen production power consumption of the device is reduced. In particular, the high-low temperature water electrolysis hydrogen production and storage coupling device according to the present invention can ensure that the hydrogen has a certain pressure through the ejector, a non-electrically driven gas pressurizing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall block diagram of a high and low temperature water electrolysis hydrogen production and storage coupling device according to a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A flowchart of the high and low temperature water electrolysis hydrogen production and storage coupling device when it is turned on;

[0020] Figure 3 yes Figure 1 Flow chart of the high and low temperature water electrolysis hydrogen production and storage coupling device during stable operation. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0022] like Figure 1As shown in the figure, the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to a preferred embodiment of the present invention includes a pure water supply system 1, a pure water electrolytic hydrogen production system 2, a first DC power supply 3, a high temperature electrolytic hydrogen production system 4, a second DC power supply 5, an ejector 6, a purification device 7, an electric drive hydrogen booster device 8, a hydrogen storage bottle group 9, a valve group 10, and a hydrogen using device 11.

[0023] The pure water electrolytic hydrogen production system 2 is supplied with raw water by the pure water supply system 1. Its first outlet pipeline is connected to the ejector 6, and its second outlet pipeline is directly connected to the purification device 7. When the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to the present invention is just started up and the high temperature electrolytic hydrogen production system 4 is heating up, the hydrogen produced by the pure water supply system 1 bypasses the ejector 6 through the second outlet pipeline and directly enters the purification device 7, and then is pressurized by the electric drive hydrogen booster device 8 and stored in the hydrogen storage bottle group 9. When the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to the present invention is operating stably, the hydrogen produced by the pure water electrolytic hydrogen production system 2 enters the ejector 6 through the first outlet pipeline.

[0024] The high temperature electrolytic hydrogen production system 4 is also supplied with raw water by the pure water supply system 1, and its outlet pipeline is connected to the ejector 6. When operating stably, the hydrogen produced by the high temperature electrolytic hydrogen production system 4 is pressurized by the ejector 6 and enters the subsequent purification device 7, electric drive hydrogen booster device 8, and hydrogen storage bottle group 9 together with the hydrogen produced by the pure water electrolytic hydrogen production system 2.

[0025] The ejector 6 includes a main gas path inlet, a side gas path inlet, and a common gas outlet. When operating stably, the hydrogen produced by the pure water electrolytic hydrogen production system 2 enters the main gas path inlet of the ejector 6, and the hydrogen produced by the high temperature electrolytic hydrogen production system 4 enters the side gas path inlet of the ejector 6. The pressure of the hydrogen at the common gas outlet is between the two hydrogen production systems 2 and 4.

[0026] The hydrogen in the hydrogen storage bottle group 9 is adjusted by the valve group 10. A part of it is used by the hydrogen using device 11, and the other part is used as a protective gas for the high temperature electrolytic hydrogen production system 4 during the electrolysis process. The valve group 10 includes a pressure reducing valve, a ball valve, a reversing valve, etc. Its function is to distribute the gas in the hydrogen storage bottle group 9, ensuring that the high temperature electrolytic hydrogen production system 4 has enough protective gas and ensuring a stable hydrogen source for the hydrogen using device 11.

[0027] As Figure 2As shown in the figure, the operation plan of the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to a preferred embodiment of the present invention when starting up includes: the valve group 10 is closed, the second DC power supply 5 of the high-temperature electrolytic hydrogen production system 4 is disconnected, and the preheating system therein starts to work to heat up the high-temperature equipment in the device; the pure water supply system 1 supplies water to the pure water electrolytic hydrogen production system 2, the first DC power supply 3 is turned on, the pure water electrolytic hydrogen production system 2 starts to produce hydrogen, and the hydrogen is stored in the hydrogen storage bottle group 9 after passing through the purification device 7 and the electric-driven hydrogen booster device 8. Adjust the valve group 10 so that a part of the hydrogen in the hydrogen storage bottle group 9 is used by the hydrogen-consuming equipment 11, and the other part is used as a protective gas when the high-temperature electrolytic hydrogen production system 4 starts to work.

[0028] As Figure 3 shown in the figure, the operation plan of the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to a preferred embodiment of the present invention when operating stably includes: after the high-temperature electrolytic hydrogen production system 4 finishes heating up, the pure water supply system 1 supplies water to the high-temperature electrolytic hydrogen production system 4, the second DC power supply 5 is turned on, and the high-temperature electrolytic hydrogen production system 4 starts to produce hydrogen. The hydrogen produced by the pure water electrolytic hydrogen production system 2 passes through the ejector 6, and takes out and boosts the hydrogen produced by the high-temperature electrolytic hydrogen production system 4 together. The hydrogen outlet pressure of the pure water electrolytic hydrogen production system 2 can be adjusted within 1-3 MPa according to the actual working conditions, so as to achieve the purpose of controlling the outlet pressure of the ejector 6.

[0029] By coupling the pure water electrolytic hydrogen production system 2 and the high-temperature electrolytic hydrogen production system 4, compared with a single high-temperature hydrogen production system, this device reduces the investment in electric-driven boosting equipment; compared with a single low-temperature hydrogen production system, this device improves the hydrogen production efficiency.

[0030] Table 1 below gives the comparison of hydrogen production power consumption between the existing low-temperature hydrogen production system and the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device of the present invention.

[0031] Table 1

[0032]

[0033] Generally speaking, the overall hydrogen production power consumption of the high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to the present invention is reduced.

[0034] Example 1

[0035] Suppose that 60 standard cubic meters of hydrogen per hour is required. The working temperature of the high-temperature electrolytic hydrogen production system 4 is 800 °C, the heating-up time is 10 hours, and the required amount of protective hydrogen is 6 standard cubic meters per hour. The pressure at the outlet of the high-temperature electrolytic hydrogen production system 4 is 0.07 MPa, the ratio of the required high-pressure side hydrogen flow rate to the low-pressure side hydrogen flow rate is 2, and the required pressure on the high-pressure side is 1 MPa.

[0036] According to the hydrogen production solution of the present invention, the high-temperature electrolysis hydrogen production system 4 supplies 20 standard cubic meters of hydrogen per hour, and the pure water electrolysis hydrogen production system 2 supplies 40 standard cubic meters of hydrogen per hour.

[0037] Step 1: At the initial startup, the preheating device in the high-temperature electrolysis hydrogen production system 4 starts to heat up. The pure water supply system 1 supplies water to the pure water electrolysis hydrogen production system 2, and the first DC power supply 3 supplies power to the pure water electrolysis hydrogen production system 2 to start hydrogen production. At this time, the hydrogen produced by the pure water electrolysis hydrogen production system 2 directly passes through the purification device 7 and the electric-driven hydrogen booster device 8 and is stored in the hydrogen storage bottle group 9.

[0038] Step 2: After 10 hours, the high-temperature electrolysis hydrogen production system 4 is heated up to 800 °C. At this time, the hydrogen storage bottle group 9 contains nearly 400 standard cubic meters of hydrogen. The pure water supply system 1 starts to supply water to the high-temperature electrolysis hydrogen production system 4.

[0039] Step 3: Adjust the valve group 10 so that a small part of the hydrogen in the hydrogen storage bottle group 9 is used as a protective gas for the high-temperature electrolysis hydrogen production system 4, and most of the hydrogen is used by the hydrogen-consuming equipment 11. Supply power to the high-temperature electrolysis hydrogen production system 4 to start hydrogen production.

[0040] Step 4: The hydrogen produced by the high-temperature electrolysis hydrogen production system 4 enters the side gas path of the ejector 6, and the hydrogen produced by the pure water electrolysis hydrogen production system 2 enters the main gas path of the ejector 6. The pure water electrolysis hydrogen production system 2 sets the outlet pressure to 1 MPa. After the hydrogen produced by the two electrolysis hydrogen production systems 2 and 4 is mixed through the ejector 6, the pressure becomes 0.3 MPa, and then it is purified by the purification device 7 and pressurized by the electric-driven hydrogen booster device 8 and stored in the hydrogen storage bottle group 9. Repeat Step 3.

[0041] If the existing electrolytic water hydrogen production method is adopted, about 300 kwh of electricity is consumed to produce 60 standard cubic meters of hydrogen per hour. If the electrolytic water hydrogen production method of the present invention is adopted, only about 260 kwh of electricity is consumed to produce 60 standard cubic meters of hydrogen per hour.

[0042] The above-mentioned are only the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various changes can be made to the above-mentioned embodiments of the present invention. That is, all simple, equivalent changes and modifications made according to the claims and the content of the specification of the present invention application fall within the scope of the claims of the present invention patent. The content not described in detail in the present invention is all conventional technical content.

Claims

1. A high and low temperature electrolyzed water hydrogen production and hydrogen storage coupling device, characterized in that It includes a pure water electrolysis hydrogen production system, a first DC power supply, a high-temperature electrolysis hydrogen production system, a second DC power supply, an ejector, a purification device, and a hydrogen storage bottle group. Among them, the pure water electrolysis hydrogen production system is connected to the first DC power supply to start the hydrogen production of the pure water electrolysis hydrogen production system by turning on the first DC power supply. The high-temperature electrolysis hydrogen production system is connected to the second DC power supply to start the hydrogen production of the high-temperature electrolysis hydrogen production system by turning on the second DC power supply. The pure water electrolysis hydrogen production system has a first outlet pipeline and a second outlet pipeline. The first outlet pipeline is directly connected to the purification device. The ejector has a main gas path inlet, a side gas path inlet, and a common gas outlet. The second outlet pipeline of the pure water electrolysis hydrogen production system is connected to the main gas path inlet of the ejector. The high-temperature electrolysis hydrogen production system is connected to the side gas path inlet of the ejector. The common gas outlet of the ejector is connected to the purification device. The hydrogen storage bottle group is respectively connected to the purification device and the high-temperature electrolysis hydrogen production system.

2. The high and low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to claim 1, wherein The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a hydrogen-using device. Among them, the inlet of the hydrogen storage bottle group is connected to the purification device, and the outlet of the hydrogen storage bottle group is respectively connected to the high-temperature electrolysis hydrogen production system and the hydrogen-using device.

3. The high and low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to claim 2, characterized in that, The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a valve group. Among them, the hydrogen storage bottle group is respectively connected to the high-temperature electrolysis hydrogen production system and the hydrogen-using device through the valve group to distribute the gas in the hydrogen storage bottle group.

4. The high and low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to claim 1, characterized in that, The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes an electrically driven hydrogen booster device. Among them, the hydrogen storage bottle group is connected to the purification device through the electrically driven hydrogen booster device.

5. The high and low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to claim 1, characterized in that The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling device further includes a pure water supply system, which is respectively connected to the pure water electrolysis hydrogen production system and the high-temperature electrolysis hydrogen production system to supply water to the pure water electrolysis hydrogen production system and the high-temperature electrolysis hydrogen production system respectively.

6. A method for coupling high and low temperature electrolytic water hydrogen production and hydrogen storage using the high and low temperature electrolytic water hydrogen production and hydrogen storage coupling device according to any one of claims 1-5, characterized in that, It includes the following steps: S1. At the initial startup, the second DC power supply is disconnected, and the preheating device in the high-temperature electrolysis hydrogen production system starts to heat up. The first DC power supply is energized, and the hydrogen generated by the pure water electrolysis hydrogen production system directly enters the purification device through the first outlet pipeline and is then stored in the hydrogen storage bottle group. S2. Part of the gas in the hydrogen storage bottle group is introduced into the high-temperature electrolysis hydrogen production system as a protective gas. The second DC power supply is energized, and the hydrogen generated by the high-temperature electrolysis hydrogen production system enters the side gas path of the ejector. The hydrogen generated by the pure water electrolysis hydrogen production system enters the main gas path of the ejector through the second outlet pipeline. The mixed gas enters the purification device through the common gas outlet of the ejector and is then stored in the hydrogen storage bottle group.

7. The high-low temperature electrolytic water hydrogen production and hydrogen storage coupling method according to claim 6, characterized in that, Wait until the preheating device in the high-temperature electrolysis hydrogen production system heats up to the working temperature before turning on the second DC power supply.

8. The method for coupling high and low temperature electrolytic water hydrogen production and hydrogen storage according to claim 6, characterized in that, The gas in the hydrogen storage bottle group is distributed through the valve group. Part of it enters the high-temperature electrolysis hydrogen production system for use as a protective gas, and the other part enters the hydrogen-using device for utilization.

9. The high and low temperature electrolytic water hydrogen production and hydrogen storage coupling method according to claim 6, characterized in that, The pressure of the pure water electrolysis hydrogen production system entering the main gas path of the ejector through the second outlet pipeline is adjusted within 0 - 3 MPa to control the pressure of the common gas outlet of the ejector.

10. The method for coupling high and low temperature electrolytic water hydrogen production and hydrogen storage according to claim 9, characterized in that, The pressure of the high-temperature electrolysis hydrogen production system entering the side gas path of the ejector is between 0.01 MPa and 0.2 MPa, and the pressure of the common gas outlet of the ejector is between the pressures of the main gas path and the side gas path.

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