CN215757657U - Universal water electrolysis hydrogen production test system capable of being used in multiple stacks - Google Patents
Universal water electrolysis hydrogen production test system capable of being used in multiple stacks Download PDFInfo
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- CN215757657U CN215757657U CN202122063199.0U CN202122063199U CN215757657U CN 215757657 U CN215757657 U CN 215757657U CN 202122063199 U CN202122063199 U CN 202122063199U CN 215757657 U CN215757657 U CN 215757657U
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Abstract
The utility model provides a general type electrolyzed water hydrogen production test system capable of being used in multiple stacks, which comprises hydrogen side outlet stop valves arranged at hydrogen side outlets of each electrolytic cell stack, wherein all the hydrogen side outlet stop valves are connected in parallel and gathered, a hydrogen side temperature sensor is arranged on a gathering pipeline and is connected with a hydrogen separator, a hydrogen side pressure regulating valve, a hydrogen side pressure sensor and a hydrogen side water replenishing switch valve are arranged at the upper side of the hydrogen separator, a hydrogen side liquid level meter is arranged at the parallel side, and a hydrogen side water discharge valve and a hydrogen side water return valve are arranged at the lower side; the rear end of the hydrogen side water return valve is provided with a hydrogen side cooler, a hydrogen side raw material circulating pump, a hydrogen side inlet stop valve and a hydrogen side inlet of the electrolytic cell stack which are connected in sequence; the connection condition of the oxygen side outlet shutoff valve is similar to that of the hydrogen side outlet shutoff valve. The two sides of the electrolytic cell stack are respectively connected with the anode and the cathode of the direct current power supply. The utility model can be universally used for various types of electrolytic cell stacks and can be used for the performance test of the parallel use of a plurality of electrolytic cell stacks.
Description
Technical Field
The utility model relates to the field of hydrogen production by water electrolysis, in particular to a universal water electrolysis hydrogen production test system capable of being used in a multi-pile mode.
Background
The development of hydrogen energy and the expansion of the proportion of renewable energy sources in hydrogen production in the overall energy source have become one of effective ways for achieving the aim of 'carbon neutralization'. The water electrolysis hydrogen production is the most hopeful technology for realizing large-scale hydrogen production by combining clean energy at present, and the performance and the stability of an electrolytic cell stack are widely concerned.
The existing commercial hydrogen production technologies can be classified into alkaline electrolysis hydrogen production (AEC), pure water electrolysis hydrogen Production (PEMEC), and weak alkali electrolysis hydrogen production (AEMEC). However, there is currently no universal test system that meets the performance and stability detection requirements for the above-described hydrogen production techniques.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a universal water electrolysis hydrogen production test system capable of being used in multiple stacks, which meets the test requirements of normal-temperature hydrogen production technologies of different types of electrolytic cell stacks.
In order to achieve the above object, the present invention provides a multi-pile and multi-use general type electrolyzed water hydrogen production test system, which is used for a plurality of electrolysis cell piles of the same specification, and comprises a hydrogen side outlet stop valve arranged at the hydrogen side outlet of each electrolysis cell pile and an oxygen side outlet stop valve arranged at the oxygen side outlet of each electrolysis cell pile; all the hydrogen side outlet stop valves are connected in parallel and gathered, a pipeline after the hydrogen side outlet stop valves are gathered is provided with a hydrogen side temperature sensor and is connected with a hydrogen separator, the upper side of the hydrogen separator is provided with a hydrogen side pressure regulating valve, a hydrogen side pressure sensor and a hydrogen side water replenishing switch valve, the parallel side of the hydrogen separator is provided with a hydrogen side liquid level meter, and the lower side of the hydrogen separator is provided with a hydrogen side water discharge valve and a hydrogen side water return valve; the rear end of the hydrogen side water return valve is provided with a hydrogen side cooler, a hydrogen side raw material circulating pump, a hydrogen side inlet stop valve and a hydrogen side inlet of the electrolytic cell stack which are connected in sequence; all the oxygen side outlet stop valves are connected in parallel and gathered, an oxygen side temperature sensor is installed on a pipeline after the oxygen side outlet stop valves are gathered and connected with an oxygen separator, an oxygen side pressure regulating valve, an oxygen side pressure sensor and an oxygen side water replenishing switch valve are installed on the upper side of the oxygen separator, an oxygen side liquid level meter is installed on the parallel side of the oxygen separator, and a hydrogen side water discharge valve and an oxygen side water return valve are installed on the lower side of the oxygen separator; the rear end of the oxygen side water return valve is provided with an oxygen side cooler, an oxygen side raw material circulating pump, an oxygen side inlet stop valve and an oxygen side inlet of the electrolytic cell stack which are connected in sequence.
The number of the hydrogen side inlet stop valve, the oxygen side inlet stop valve and the electrolytic cell stack is multiple; the hydrogen side inlet stop valves are connected in parallel with each other through a hydrogen side raw material circulating pump, and each hydrogen side inlet stop valve is connected with the hydrogen side inlet of one of the electrolytic cell stacks; the oxygen side inlet stop valves are connected in parallel with each other through the oxygen side raw material circulating pump, and each oxygen side inlet stop valve is connected with the oxygen side inlet of one of the electrolytic cell stacks.
The inlet ends of the hydrogen side water replenishing switch valve and the oxygen side water replenishing switch valve are connected with the same water replenishing pump, the water replenishing pump is set to provide raw material water, and the raw material water is deionized water or alkali liquor.
The hydrogen side pressure sensor is in communication connection with the hydrogen side pressure regulating valve, and the oxygen side pressure sensor is in communication connection with the oxygen side pressure regulating valve, so that the hydrogen side pressure sensor transmits a pressure signal detected by the hydrogen side pressure sensor to the hydrogen side pressure regulating valve, and the oxygen side pressure sensor transmits a pressure signal detected by the oxygen side pressure sensor to the oxygen side pressure regulating valve.
The hydrogen side liquid level meter is in communication connection with the hydrogen side water replenishing switch valve and the hydrogen side water discharging valve respectively, so that the hydrogen side liquid level meter transmits a detected liquid level signal to the hydrogen side water replenishing switch valve and the hydrogen side water discharging valve; the oxygen side liquid level meter is in communication connection with the oxygen side water replenishing switch valve and the oxygen side drain valve respectively, so that the oxygen side liquid level meter transmits a liquid level signal detected by the oxygen side liquid level meter to the oxygen side water replenishing switch valve and the oxygen side drain valve.
The control requirement of the liquid level height represented by the liquid level signal detected by the hydrogen side liquid level meter is as follows: the water level meter can not be lower than a low-side detection point of the hydrogen-side liquid level meter and can not be higher than a water replenishing port on the hydrogen separator; and the control requirement of the liquid level height represented by the liquid level signal detected by the oxygen side liquid level meter is as follows: can not be lower than the low-side detection point of the oxygen-side liquid level meter and can not be higher than a water filling port on the oxygen separator.
The hydrogen side temperature sensor is in communication with the hydrogen side cooler such that the hydrogen side temperature sensor transmits a temperature signal detected by the hydrogen side temperature sensor to the hydrogen side cooler.
The oxygen-side temperature sensor is in communication with the oxygen-side cooler such that the oxygen-side temperature sensor transmits a temperature signal detected by the oxygen-side temperature sensor to the oxygen-side cooler.
The electrolytic cell stack is connected with a direct current power supply, so that direct current required by electrolysis is provided by the direct current power supply; the direct current power supply is provided with a plurality of electrolysis gears and can simultaneously supply power to a plurality of electrolytic cell stacks; the dc power supply can record the voltage and current supplied to each cell stack and can record the total voltage, total current required for electrolysis.
The general type water electrolysis hydrogen production test system capable of being used in multiple stacks is provided with the respective parallel loops of the hydrogen side and the oxygen side, can simultaneously meet the test requirements of normal-temperature hydrogen production technologies of different types of electrolytic cell stacks, can be used for performance test of parallel use of the multiple electrolytic cell stacks, and can conveniently and efficiently detect the volt-ampere characteristic curve, the hydrogen production efficiency influence along with the working temperature and pressure of an alkaline electrolysis electrolytic cell, a pure water electrolysis cell and a weak base electrolysis hydrogen production electrolytic cell and the feasibility of combined use of the multiple electrolytic cell stacks.
Drawings
FIG. 1 is a schematic structural diagram of a general-purpose water electrolysis hydrogen production test system capable of being used in multiple stacks.
FIG. 2 is a schematic diagram of the connection between the cell stack and the DC power supply of the present invention.
FIG. 3 is a working principle diagram of a test mode of a strong alkali hydrogen production electrolytic cell stack and a test mode of electrolyte bilateral circulation of a weak alkali hydrogen production electrolytic cell stack of a general water electrolysis hydrogen production test method capable of being used in multiple stacks.
FIG. 4 is a schematic diagram of the test mode of a pure water hydrogen production electrolytic cell stack of a general type test method for producing hydrogen by electrolyzing water, which can be used in multiple stacks.
FIG. 5 is a working schematic diagram of the electrolyte hydrogen side circulation test mode of the weak base hydrogen production electrolytic cell stack of the general water electrolysis hydrogen production test method capable of being used in multiple stacks.
Reference numerals:
a plurality of electrolyzer stacks stack1, stack2, stack3, stack4, a hydrogen side pressure regulating valve 1, a hydrogen side pressure sensor 2, a hydrogen separator 3, a hydrogen side level meter 4, a hydrogen side water replenishing switch valve 5, a water replenishing pump 6, an oxygen side water replenishing switch valve 7, an oxygen side level meter 8, an oxygen separator 9, an oxygen side pressure sensor 10, an oxygen side pressure regulating valve 11, an oxygen side water returning valve 12, an oxygen side water discharging valve 13, an oxygen side cooler 14, an oxygen side raw material circulating pump 15, an oxygen side temperature sensor 16, a hydrogen side water discharging valve 17, a hydrogen side cooler 18, a hydrogen side raw material circulating pump 19, an oxygen side inlet cut-off valve 20, a hydrogen side inlet cut-off valve 21, an oxygen side outlet cut-off valve 22, a hydrogen side outlet cut-off valve 23, a hydrogen side temperature sensor 24, a hydrogen side water returning valve 25, and a direct current power supply 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Fig. 1 shows a general type test system for hydrogen production from electrolyzed water, which can be used in combination with a plurality of stacks, stack1, stack2, stack3 and stack4, of the same specification, and comprises: a hydrogen side pressure regulating valve 1, a hydrogen side pressure sensor 2, a hydrogen separator 3, a hydrogen side level meter 4, a hydrogen side water replenishing switch valve 5, a water replenishing pump 6, an oxygen side water replenishing switch valve 7, an oxygen side level meter 8, an oxygen separator 9, an oxygen side pressure sensor 10, an oxygen side pressure regulating valve 11, an oxygen side water return valve 12, an oxygen side water discharge valve 13, an oxygen side cooler 14, an oxygen side raw material circulating pump 15, an oxygen side temperature sensor 16, a hydrogen side water discharge valve 17, a hydrogen side cooler 18, a hydrogen side raw material circulating pump 19, an oxygen side inlet stop valve 20, a hydrogen side inlet stop valve 21, an oxygen side outlet stop valve 22, a hydrogen side outlet stop valve 23, a hydrogen side temperature sensor 24, and a hydrogen side water return valve 25.
The hydrogen side outlet of each electrolytic cell stack is provided with a hydrogen side outlet stop valve 23, all the hydrogen side outlet stop valves 23 are connected in parallel and gathered, a pipeline after the hydrogen side outlet stop valves 23 are gathered is provided with a hydrogen side temperature sensor 24 and connected with a hydrogen separator 3, the upper side of the hydrogen separator 3 is provided with a hydrogen side pressure regulating valve 1, a hydrogen side pressure sensor 2 and a hydrogen side water replenishing switch valve 5, the parallel side (namely the side surface) of the hydrogen separator 3 is provided with a hydrogen side liquid level meter 4, and the lower side of the hydrogen separator 3 is provided with a hydrogen side drain valve 17 and a hydrogen side water returning valve 25. The rear end of the hydrogen side return valve 25 is provided with a hydrogen side cooler 18, a hydrogen side raw material circulating pump 19, a hydrogen side inlet stop valve 21 and a hydrogen side inlet of the electrolytic cell stack which are connected in sequence, wherein the hydrogen side inlet stop valve 21 and the electrolytic cell stack are in a plurality of numbers, the hydrogen side inlet stop valves 21 are connected in parallel with each other through the hydrogen side raw material circulating pump 19, and each hydrogen side inlet stop valve 21 is connected with the hydrogen side inlet of one of the electrolytic cell stacks respectively.
The oxygen side outlets of each electrolytic cell stack1, stack2, stack3 and stack4 are all provided with an oxygen side outlet stop valve 22, all the oxygen side outlet stop valves 22 are connected in parallel and gathered, an oxygen side temperature sensor 16 is installed on a pipeline after the oxygen side outlet stop valves 22 are gathered and connected with an oxygen separator 9, an oxygen side pressure regulating valve 11, an oxygen side pressure sensor 10 and an oxygen side water replenishing switch valve 7 are installed on the upper side of the oxygen separator 9, an oxygen side liquid level meter 8 is installed on the parallel side of the oxygen separator 9, and a hydrogen side drain valve 13 and an oxygen side water return valve 12 are installed on the lower side of the oxygen separator 9. The rear end of the oxygen side water return valve 12 is provided with an oxygen side cooler 14, an oxygen side raw material circulating pump 15, an oxygen side inlet stop valve 20 and an oxygen side inlet of the electrolytic cell stack which are connected in sequence, wherein the number of the oxygen side inlet stop valve 20 and the electrolytic cell stack is a plurality, the oxygen side inlet stop valves 20 are connected in parallel with each other through the oxygen side raw material circulating pump 15, and each oxygen side inlet stop valve 20 is connected with the oxygen side inlet of one of the electrolytic cell stacks respectively.
The inlet ends of the hydrogen side water replenishing switch valve 5 and the oxygen side water replenishing switch valve 7 are connected with the same water replenishing pump 6, and the water replenishing pump 6 is set to provide raw material water. Wherein the raw material water can be deionized water or alkali liquor, and the alkali liquor is weak alkali liquor or strong alkali liquor.
The hydrogen side pressure sensor 2 is in communication with the hydrogen side pressure regulating valve 1, and the oxygen side pressure sensor 10 is in communication with the oxygen side pressure regulating valve 11, so that the hydrogen side pressure sensor 2 can transmit a pressure signal detected by the pressure sensor to the hydrogen side pressure regulating valve 1 to control the opening of the hydrogen side pressure regulating valve 1, and the oxygen side pressure sensor 10 can transmit a pressure signal detected by the pressure sensor to the oxygen side pressure regulating valve 11 to control the opening of the oxygen side pressure regulating valve 11.
The hydrogen side liquid level meter 4 is in communication connection with the hydrogen side water replenishing switch valve 5 and the hydrogen side water discharging valve 17 respectively, so that the hydrogen side liquid level meter 4 can transmit a liquid level signal detected by the hydrogen side liquid level meter to the hydrogen side water replenishing switch valve 5 and the hydrogen side water discharging valve 17 to control the opening and closing of the two valves.
The oxygen side liquid level meter 8 is in communication connection with the oxygen side water replenishing switch valve 7 and the oxygen side water discharging valve 13, so that the oxygen side liquid level meter 8 can transmit the detected liquid level signal to the oxygen side water replenishing switch valve 7 and the oxygen side water discharging valve 13 to control the opening and closing of the valves.
In this embodiment, the control requirement for the liquid level height represented by the liquid level signal is: cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator. For alkaline electrolyte (namely raw material water) of strong alkali and weak alkali, the change of the electrolyte concentration in the equipment is ensured within 1% after water is consumed by electrolysis (compared with 27-32% required by the national standard GBT37562-2019 of the current related industrial application, the requirement of the test system of the application is higher).
That is, in the present embodiment, when the hydrogen-side level meter 4 (or the oxygen-side level meter 8) detects that the liquid level indicated by the liquid level signal is higher than the water replenishment port on the hydrogen separator 3 (or the oxygen separator 9), the hydrogen-side water discharge valve 17 (or the oxygen-side water discharge valve 13) is opened; when the liquid level indicated by the liquid level signal is lower than the water replenishment port on the hydrogen separator 3 (or the oxygen separator 9), the hydrogen side water discharge valve 17 (or the oxygen side water discharge valve 13) is closed. Thereby, the control requirement of the liquid level height represented by the liquid level signal is satisfied.
Similarly, when the hydrogen-side level meter 4 (or the oxygen-side level meter 8) detects that the liquid level height indicated by the liquid level signal is lower than the low-side detection point of the hydrogen-side level meter 4 (or the oxygen-side level meter 8), the hydrogen-side water replenishment switching valve 5 (or the oxygen-side water replenishment switching valve 7) is opened; when the liquid level indicated by the liquid level signal is higher than the low-side detection point of the hydrogen-side level meter 4 (or the oxygen-side level meter 8), the hydrogen-side water replenishment switching valve 5 (or the oxygen-side water replenishment switching valve 7) is closed. Thereby, the control requirement of the liquid level height represented by the liquid level signal is satisfied.
The hydrogen side temperature sensor 24 is in communication with the hydrogen side cooler 18, whereby the hydrogen side temperature sensor 24 can transmit its sensed temperature signal to the hydrogen side cooler 18 to control the amount of cooling and thus the temperature entering the hydrogen separator 3. In this embodiment, the required temperature entering the hydrogen separator 3 needs to be controlled at 60 ℃ to 95 ℃, set as required.
The oxygen side temperature sensor 16 is in communication with the oxygen side cooler 14, whereby the oxygen side temperature sensor 16 can transmit its detected temperature signal to the oxygen side cooler 14 to control the amount of cooling and thus the temperature entering the oxygen separator 9. Wherein the required temperature entering the oxygen separator 9 is consistent with the required temperature entering the hydrogen separator 3, and the required temperature entering the oxygen separator 9 needs to be controlled between 60 ℃ and 95 ℃, and is set according to requirements.
As shown in fig. 1 and 2, the cell stack is connected to a dc power supply 26 so that dc power required for electrolysis is supplied from the dc power supply 26; the direct current power supply 26 has a plurality of electrolysis gears and can simultaneously supply power to a plurality of electrolytic cell stacks; the dc power supply 26 can record the voltage and current provided to each cell stack 26 and can record the total voltage, total current required for electrolysis.
The data of the required test of the universal water electrolysis hydrogen production test system capable of being used in multiple stacks comprises the following data: the influence of the volt-ampere characteristic curve and the hydrogen production efficiency of the electrolytic cell stack along with the working temperature and the pressure and the feasibility of the combined use of a plurality of electrolytic cell stacks. The volt-ampere characteristic curve of the electrolytic cell stack is obtained by recording voltage and current data through the direct current power supply 26, and the influence of the hydrogen production efficiency along with the working temperature and the pressure is obtained by measuring the liquid level through the hydrogen side liquid level meter 4 and the oxygen side liquid level meter 8, measuring the temperature through the oxygen side temperature sensor 16 and the hydrogen side temperature sensor 24, and measuring the pressure through the hydrogen side pressure sensor 2 and the oxygen side pressure sensor 10.
Based on the universal water electrolysis hydrogen production system capable of being used in a multi-pile mode, the universal water electrolysis hydrogen production testing method capable of being used in a multi-pile mode is switchable among four working modes, wherein the working modes comprise a strong alkali hydrogen production electrolytic cell pile testing mode, a pure water hydrogen production electrolytic cell pile testing mode, a weak alkali hydrogen production electrolytic cell pile electrolyte bilateral circulation testing mode and a weak alkali hydrogen production electrolytic cell pile electrolyte hydrogen side circulation testing mode.
Fig. 3 shows a first working mode of a general-purpose test method for hydrogen production by water electrolysis, which can be used in multiple stacks, wherein the working mode is a test mode of a strong alkali hydrogen production electrolytic cell stack, that is, in the working mode, the electrolytic cell stack is a strong alkali hydrogen production electrolytic cell stack. The strong alkali hydrogen production electrolytic cell stack is characterized in that a hydrogen side and an oxygen side can not bear differential pressure operation, and the hydrogen side and the oxygen side must be simultaneously provided with electrolyte circulation during work.
In the working mode, the universal water electrolysis hydrogen production test method capable of being used in multiple stacks specifically comprises the following steps:
step S1: connecting the universal water electrolysis hydrogen production test system which can be used in a multi-pile mode and is used together with a plurality of electrolytic cell piles;
step S2: opening an oxygen side inlet stop valve 20, a hydrogen side inlet stop valve 21, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 which are arranged in front of and behind the electrolytic cell stack of the multi-stack and universal type electrolytic water hydrogen production test system; closing the hydrogen side water discharge valve 17 and the oxygen side water discharge valve 13, and opening the hydrogen side water replenishing switch valve 5 and the oxygen side water replenishing switch valve 7, so that the strong alkali liquor is injected into the hydrogen separator 3 and the oxygen separator 9 through the water replenishing pump 6 until the control requirement of the liquid level height represented by the liquid level signal is met (namely the liquid level signal cannot be lower than the low-side detection site of the liquid level meter and cannot be higher than the water replenishing port on the separator), and closing the hydrogen side water replenishing switch valve 5 and the oxygen side water replenishing switch valve 7 at the moment.
In this embodiment, the alkali solution is a 30% by weight potassium hydroxide solution or a 25% by weight sodium hydroxide solution.
If a plurality of alkaline electrolytic cell stacks are measured to be connected in parallel, opening an oxygen side inlet stop valve 20, a hydrogen side inlet stop valve 21, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 which are arranged in front of and behind each electrolytic cell stack; if a single cell stack is to be measured, the oxygen side inlet cut-off valve 20, the hydrogen side inlet cut-off valve 21, the oxygen side outlet cut-off valve 22, and the hydrogen side outlet cut-off valve 23 in front of and behind the cell stack to be measured need only be opened.
Step S3: and opening the oxygen side raw material circulating pump 15, the hydrogen side raw material circulating pump 19, the oxygen side water return valve 12 and the hydrogen side water return valve 25 to enable strong alkali liquor to fill the inside of the whole universal type electrolyzed water hydrogen production test system capable of being used in a multi-pile mode, and maintaining the liquid levels in the hydrogen separator 3 and the oxygen separator 9.
The steps S1-S3 are for ensuring that the alkaline electrolytic cell stack has electrolyte on both the hydrogen side and the oxygen side.
Step S4: when the strong alkali lye is filled in the general type water electrolysis hydrogen production test system which can be used in a multi-pile mode, direct current is introduced into the tested electrolytic cell pile, and the electrolytic cell pile begins to generate hydrogen and oxygen. Thereby, the hydrogen gas and the unreacted electrolyte enter the hydrogen separator 3, and the oxygen gas and the unreacted electrolyte enter the oxygen separator 9.
Step S5: the hydrogen-side pressure regulating valve 1 and the oxygen-side pressure regulating valve 11 regulate the opening of the valves based on the data measured by the hydrogen-side pressure sensor 2 and the oxygen-side pressure sensor 10, respectively, and the required outlet pressure, thereby stabilizing the outlet pressure; the hydrogen side water replenishing switch valve 5 and the oxygen side water replenishing switch valve 7 are respectively opened or closed according to the liquid level height represented by the liquid level signals detected by the hydrogen side liquid level meter 4 and the oxygen side liquid level meter 8 and the control requirement of the liquid level height, so that the stable liquid levels in the hydrogen separator 3 and the oxygen separator 9 are maintained; the hydrogen side cooler 18 and the oxygen side cooler 14 control their cooling powers based on the data detected by the hydrogen side temperature sensor 24 and the oxygen side temperature sensor 16, respectively, and the required temperatures.
Thus, the pressure equalization of the hydrogen side and the oxygen side is ensured in operation by the step S5.
In said step S5, the required outlet pressure is set according to the requirements, and should generally be between 0 and 3.5 MPa. The control requirements for the level height represented by the level signal are: cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator. The required temperature is controlled to be 60-95 ℃, and is set according to requirements.
In the step S5, since water is consumed during the cell stack reaction, in the step S5, the water replenishing pump 6 is configured to supply deionized water, and when the levels measured by the hydrogen-side level meter 4 and the oxygen-side level meter 8 are low (e.g., lower than the low-side detection point of the level meters), the hydrogen-side water replenishing switching valve 5 and the oxygen-side water replenishing switching valve 7 are opened, the water replenishing pump 6 injects deionized water into the separator, and after a specified level, the corresponding hydrogen-side water replenishing switching valve 5 and the corresponding oxygen-side water replenishing switching valve 7 are closed.
Although hydrogen and oxygen are produced by electrolysis and water is consumed, the liquid level is low, but the water consumption rate is much lower than the water replenishment rate, and therefore, the hydrogen side water replenishment switching valve 5 and the oxygen side water replenishment switching valve 7 may be closed to cut off the water replenishment and prevent the water in the separator from overflowing in accordance with the control requirement of the liquid level height.
Fig. 4 shows a second operation mode of the general water electrolysis hydrogen production test method capable of being used in multiple stacks, where the operation mode is a test mode of pure water hydrogen production electrolytic cell stacks, that is, in the operation mode, all the electrolytic cell stacks are pure water hydrogen production electrolytic cell stacks. The pure water hydrogen production electrolytic cell stack is characterized in that the hydrogen side pressure is slightly higher than the oxygen side, and only the oxygen side of the pure water hydrogen production electrolytic cell stack is filled with water during working.
In the working mode, the universal water electrolysis hydrogen production test method capable of being used in multiple stacks specifically comprises the following steps:
step S1': connecting the universal water electrolysis hydrogen production test system which can be used in a multi-pile mode and is used together with a plurality of electrolytic cell piles;
step S2': opening an oxygen side inlet stop valve 20, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 at the front and the rear of an electrolytic cell stack of the multi-stack and common type electrolytic water hydrogen production test system, and closing the hydrogen side inlet stop valve 21; and closing the hydrogen side water discharge valve 17 and the oxygen side water discharge valve 13, closing the hydrogen side water replenishing switch valve 5 and opening the oxygen side water replenishing switch valve 7 so that the deionized water is injected into the oxygen separator 9 through the water replenishing pump 6 until the liquid level height of the oxygen separator 9 meets the control requirement of the liquid level height indicated by the liquid level signal (namely, the liquid level height cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator), and closing the oxygen side water replenishing switch valve 7 at the moment.
If a plurality of electrolytic cell stacks are measured to be connected in parallel, opening an oxygen side inlet stop valve 20, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 at the front and the back of each electrolytic cell stack, and closing a hydrogen side inlet stop valve 21 of each electrolytic cell stack; if a single alkaline cell stack is to be measured, it is only necessary to open the oxygen side inlet cut-off valve 20, the oxygen side outlet cut-off valve 22, and the hydrogen side outlet cut-off valve 23 before and after the cell stack to be measured, and to close the hydrogen side inlet cut-off valve 21 of the cell stack.
Step S3': the oxygen side feed circulation pump 15 and the oxygen side return valve 12 are opened while the hydrogen side feed circulation pump 19 and the hydrogen side return valve 25 are kept closed to fill the entire loop of the oxygen side of the electrolyzer stack with deionized water and maintain the level of the oxygen separator 9.
The above steps S1 '-S3' are for ensuring that the oxygen side of the pure water electrolyzer stack is filled with water.
Step S4': when the ionized water fills the whole loop on the oxygen side of the electrolytic cell stack, direct current is introduced into the electrolytic cell stack to be tested, and the electrolytic cell stack starts to generate hydrogen and oxygen. Thus, hydrogen entrains mist into the hydrogen separator 3 and oxygen and unreacted deionized water into the oxygen separator 9.
Step S5': the hydrogen-side pressure regulating valve 1 and the oxygen-side pressure regulating valve 11 regulate the opening of the valves based on the data measured by the hydrogen-side pressure sensor 2 and the oxygen-side pressure sensor 10, respectively, and the required outlet pressure, thereby stabilizing the outlet pressure; the hydrogen side water replenishing switch valve 5 is kept closed, and the oxygen side water replenishing switch valve 7 is opened or closed according to the liquid level height represented by the liquid level signal detected by the oxygen side liquid level meter 8 and the control requirement of the liquid level height, so that the stable liquid level in the oxygen separator 9 is maintained; the hydrogen side cooler 18 is not operated, and the oxygen side cooler 14 controls its cooling power based on the data detected by the oxygen side temperature sensor 16 and the required temperature.
In said step S5', the required outlet pressure is set according to the requirements, and should generally be between 0-3.5 MPa. The control requirements for the level height represented by the level signal are: cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator. The required temperature is controlled to be 60-95 ℃, and is set according to requirements.
Thus, the hydrogen-side pressure of the pure water electrolyzer stack is made slightly higher than the oxygen-side pressure in step S5'.
In the step S5 ', since water is consumed during the reaction of the electrolytic cell stack, in the step S5', the make-up water pump 6 is configured to supply deionized water, and when the liquid level measured by the oxygen-side level meter 8 is low (e.g., lower than the low-side detection point of the level meter), the oxygen-side make-up water switching valve 7 is opened, so that the make-up water pump 6 injects deionized water into the oxygen separator, and the corresponding oxygen-side make-up water switching valve 7 is closed after a specified liquid level.
The third and fourth working modes of the testing method of the universal type water electrolysis hydrogen production testing system capable of being used in multiple stacks are both the testing modes of the weak base hydrogen production electrolytic cell stack, and under the third and fourth working modes, the electrolytic cell stack is the weak base hydrogen production electrolytic cell stack. The weak base hydrogen production electrolytic cell stack is characterized in that a hydrogen side and an oxygen side can bear a certain differential pressure, and the difference is that in work, under a third work doing mode, the hydrogen side and the oxygen side are filled with water at the same time, and the third work doing mode is an electrolyte bilateral circulation test mode of the weak base hydrogen production electrolytic cell stack; and in the fourth working mode, the hydrogen side of the electrolytic cell stack is filled with moisture, and the test mode is the electrolyte hydrogen side circulation test mode of the weak alkali hydrogen production electrolytic cell stack.
In the electrolyte bilateral circulation test mode of the weak-base hydrogen production electrolytic cell stack, because the hydrogen-requiring side and the oxygen-requiring side are full of moisture at the same time, the steps of the corresponding test method are as shown in fig. 3, and are completely consistent with the general water electrolysis hydrogen production test method which can be used in a multi-stack mode under the working mode of testing the strong-base hydrogen production electrolytic cell stack. The difference is that the test objects of the two are different, and the electrolytic cell stack is the weak-alkali hydrogen-making electrolytic cell stack in the electrolyte bilateral circulation test mode of the weak-alkali hydrogen-making electrolytic cell stack.
Under the circulation test mode of the hydrogen side of the electrolyte of the weak base hydrogen production electrolytic cell stack, only the hydrogen side is full of moisture, and the corresponding test method of the universal water electrolysis hydrogen production test system capable of being used in multiple stacks is shown in fig. 5, and comprises the following steps:
step S1 ″: connecting the universal water electrolysis hydrogen production test system which can be used in a multi-pile mode and is used together with a plurality of electrolytic cell piles;
step S2 ″: opening a hydrogen side inlet stop valve 21, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 at the front and the rear of an electrolytic cell stack of the general type electrolytic water hydrogen production test system capable of being used in multiple stacks, and closing an oxygen side inlet stop valve 20; closing the hydrogen side water discharge valve 17 and the oxygen side water discharge valve 13, opening the hydrogen side water replenishing switch valve 5 and closing the oxygen side water replenishing switch valve 7, so that the weak alkali lye is injected into the hydrogen separator 3 through the water replenishing pump 6 until the liquid level height of the hydrogen separator 3 meets the control requirement of the liquid level height represented by the liquid level signal (namely, the liquid level height cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator), and closing the hydrogen side water replenishing switch valve 5 at the moment.
Wherein the weak alkali lye is a potassium hydroxide solution with the mass fraction of 5%.
If a plurality of electrolytic cell stacks are measured to be connected in parallel, opening a hydrogen side inlet stop valve 21, an oxygen side outlet stop valve 22 and a hydrogen side outlet stop valve 23 at the front and the back of each electrolytic cell stack, and closing an oxygen side inlet stop valve 20 of each electrolytic cell stack; if a single alkaline cell stack is to be measured, it is only necessary to open the hydrogen side inlet cut-off valve 21, the oxygen side outlet cut-off valve 22, and the hydrogen side outlet cut-off valve 23 before and after the cell stack to be measured, and to close the oxygen side inlet cut-off valve 20 of the cell stack.
Step S3 ″: the oxygen side feed circulation pump 15 and the oxygen side return valve 12 are kept closed, while the hydrogen side feed circulation pump 19 and the hydrogen side return valve 25 are opened to fill the entire circuit of the hydrogen side of the electrolyzer stack with weak alkaline liquor (i.e., feed water) and to maintain the liquid level of the hydrogen separator 3.
The above steps S1-S3 are for ensuring that the hydrogen side of the electrolyzer stack is filled with moisture.
Step S4 ″: when the weak alkali lye is filled in the whole loop of the hydrogen side of the electrolytic cell stack, the direct current is introduced into the electrolytic cell stack to be tested, and the electrolytic cell stack begins to generate hydrogen and oxygen. Thus, hydrogen gas entrains water mist into the hydrogen separator 3, and oxygen gas and unreacted raw water enter the oxygen separator 9. That is, the hydrogen separator 3 is substantially free of water.
Step S5 ″: the hydrogen side pressure regulating valve 1 and the oxygen side pressure regulating valve 11 regulate the valve opening such that the hydrogen side pressure is slightly higher than or equal to the oxygen side pressure, based on the data measured by the hydrogen side pressure sensor 2 and the oxygen side pressure sensor 10, respectively, and the required outlet pressure; the oxygen side water replenishing switch valve 7 is kept closed, and the hydrogen side water replenishing switch valve 5 is opened or closed according to the liquid level height indicated by the liquid level signal detected by the hydrogen side liquid level meter 4 and the control requirement of the liquid level height, so that the stable liquid level in the hydrogen separator 3 is maintained; the oxygen side cooler 14 is not operated, and the hydrogen side cooler 18 controls its cooling power based on the data detected by the hydrogen side temperature sensor 24 and the required temperature.
Thus, the hydrogen separator 3 and the oxygen separator 9 are maintained at a certain pressure difference by step S5 ″.
In said step S5 ", the required outlet pressure is set according to the requirements, and should generally be between 0 and 3.5 MPa. The control requirements for the level height represented by the level signal are: cannot be lower than the low-side detection point of the liquid level meter and cannot be higher than the water replenishing port on the separator. The required temperature is controlled to be 60-95 ℃, and is set according to requirements.
In the step S5 ″, since water is consumed during the reaction of the electrolyzer stack, in the step S5 ″, the water replenishment pump 6 is set to supply deionized water, and when the liquid level measured by the hydrogen side level meter 4 is low, the hydrogen side water replenishment on-off valve 5 is opened, the water replenishment pump 6 injects deionized water into the hydrogen separator, and after the specified liquid level is reached, the corresponding hydrogen side water replenishment on-off valve 5 is closed.
In addition, the step S5 ″ may further include: the oxygen side drain valve 13 controls the opening and closing of the oxygen side drain valve 13 according to the data measured by the oxygen side level meter 8 and the oxygen side level meter 8 to maintain the liquid level for opening or closing, thereby maintaining the stable liquid level in the oxygen separator 9.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The utility model has not been described in detail in order to avoid obscuring the utility model.
Claims (9)
1. A general type electrolyzed water hydrogen production test system capable of being used in multiple stacks is characterized in that the system is used for multiple electrolytic cell stacks with the same specification and comprises a hydrogen side outlet stop valve arranged at a hydrogen side outlet of each electrolytic cell stack and an oxygen side outlet stop valve arranged at an oxygen side outlet of each electrolytic cell stack;
all the hydrogen side outlet stop valves are connected in parallel and gathered, a pipeline after the hydrogen side outlet stop valves are gathered is provided with a hydrogen side temperature sensor and is connected with a hydrogen separator, the upper side of the hydrogen separator is provided with a hydrogen side pressure regulating valve, a hydrogen side pressure sensor and a hydrogen side water replenishing switch valve, the parallel side of the hydrogen separator is provided with a hydrogen side liquid level meter, and the lower side of the hydrogen separator is provided with a hydrogen side water discharge valve and a hydrogen side water return valve; the rear end of the hydrogen side water return valve is provided with a hydrogen side cooler, a hydrogen side raw material circulating pump, a hydrogen side inlet stop valve and a hydrogen side inlet of the electrolytic cell stack which are connected in sequence;
all the oxygen side outlet stop valves are connected in parallel and gathered, an oxygen side temperature sensor is installed on a pipeline after the oxygen side outlet stop valves are gathered and connected with an oxygen separator, an oxygen side pressure regulating valve, an oxygen side pressure sensor and an oxygen side water replenishing switch valve are installed on the upper side of the oxygen separator, an oxygen side liquid level meter is installed on the parallel side of the oxygen separator, and a hydrogen side water discharge valve and an oxygen side water return valve are installed on the lower side of the oxygen separator; the rear end of the oxygen side water return valve is provided with an oxygen side cooler, an oxygen side raw material circulating pump, an oxygen side inlet stop valve and an oxygen side inlet of the electrolytic cell stack which are connected in sequence.
2. The universal water electrolysis hydrogen production test system capable of being used in multiple stacks according to claim 1, wherein the number of the hydrogen side inlet stop valve, the oxygen side inlet stop valve and the electrolytic cell stack is multiple; the hydrogen side inlet stop valves are connected in parallel with each other through a hydrogen side raw material circulating pump, and each hydrogen side inlet stop valve is connected with the hydrogen side inlet of one of the electrolytic cell stacks; the oxygen side inlet stop valves are connected in parallel with each other through the oxygen side raw material circulating pump, and each oxygen side inlet stop valve is connected with the oxygen side inlet of one of the electrolytic cell stacks.
3. The universal water electrolysis hydrogen production test system capable of being used in multiple piles according to claim 1, wherein the inlet ends of the hydrogen side water replenishing switch valve and the oxygen side water replenishing switch valve are both connected with the same water replenishing pump, the water replenishing pump is configured to provide raw material water, and the raw material water is deionized water or alkali liquor.
4. The universal water electrolysis hydrogen production test system capable of being used in combination in multiple stacks according to claim 1, wherein the hydrogen side pressure sensor is in communication connection with the hydrogen side pressure regulating valve, and the oxygen side pressure sensor is in communication connection with the oxygen side pressure regulating valve, so that the hydrogen side pressure sensor transmits the pressure signal detected by the hydrogen side pressure sensor to the hydrogen side pressure regulating valve, and the oxygen side pressure sensor transmits the pressure signal detected by the oxygen side pressure sensor to the oxygen side pressure regulating valve.
5. The universal type electrolytic water hydrogen production test system capable of being used in combination of multiple piles according to claim 1, wherein the hydrogen side liquid level meter is in communication connection with the hydrogen side water replenishing switch valve and the hydrogen side water discharging valve respectively, so that the hydrogen side liquid level meter transmits a liquid level signal detected by the hydrogen side liquid level meter to the hydrogen side water replenishing switch valve and the hydrogen side water discharging valve; the oxygen side liquid level meter is in communication connection with the oxygen side water replenishing switch valve and the oxygen side drain valve respectively, so that the oxygen side liquid level meter transmits a liquid level signal detected by the oxygen side liquid level meter to the oxygen side water replenishing switch valve and the oxygen side drain valve.
6. The universal hydrogen production from electrolyzed water test system capable of being used in combination according to claim 5, wherein the control requirements of the liquid level height represented by the liquid level signal detected by the hydrogen side liquid level meter are as follows: the water level meter can not be lower than a low-side detection point of the hydrogen-side liquid level meter and can not be higher than a water replenishing port on the hydrogen separator;
and the control requirement of the liquid level height represented by the liquid level signal detected by the oxygen side liquid level meter is as follows: can not be lower than the low-side detection point of the oxygen-side liquid level meter and can not be higher than a water filling port on the oxygen separator.
7. The universal water electrolysis hydrogen production test system capable of being used in combination in multiple stacks according to claim 1, wherein the hydrogen side temperature sensor is in communication connection with the hydrogen side cooler, so that the hydrogen side temperature sensor transmits the temperature signal detected by the hydrogen side temperature sensor to the hydrogen side cooler.
8. The universal water electrolysis hydrogen production test system capable of being used in combination according to claim 7, wherein the oxygen side temperature sensor is in communication connection with the oxygen side cooler, so that the oxygen side temperature sensor transmits the temperature signal detected by the oxygen side temperature sensor to the oxygen side cooler.
9. The universal water electrolysis hydrogen production test system capable of being used in multiple stacks according to claim 7, wherein the electrolyzer stack is connected with a direct current power supply, so that direct current power required by electrolysis is provided by the direct current power supply; the dc power supply is capable of recording the voltage and current supplied to each cell stack and recording the total voltage, total current required for electrolysis.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112534085A (en) * | 2018-07-27 | 2021-03-19 | 西门子能源环球有限责任两合公司 | Electrolysis unit and method for operating an electrolysis unit |
| CN114739456A (en) * | 2022-04-13 | 2022-07-12 | 佛山仙湖实验室 | Multi-channel PEM pure water electrolysis hydrogen production testing device and using method thereof |
| CN115029733A (en) * | 2022-06-23 | 2022-09-09 | 中国船舶重工集团公司第七一八研究所 | System and method for regulating and controlling flow of alkaline liquor of many-to-one water electrolysis hydrogen production device |
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2021
- 2021-08-30 CN CN202122063199.0U patent/CN215757657U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112534085A (en) * | 2018-07-27 | 2021-03-19 | 西门子能源环球有限责任两合公司 | Electrolysis unit and method for operating an electrolysis unit |
| CN112534085B (en) * | 2018-07-27 | 2023-09-26 | 西门子能源环球有限责任两合公司 | Electrolytic cell and method for operating an electrolytic cell |
| CN114739456A (en) * | 2022-04-13 | 2022-07-12 | 佛山仙湖实验室 | Multi-channel PEM pure water electrolysis hydrogen production testing device and using method thereof |
| CN114739456B (en) * | 2022-04-13 | 2023-08-22 | 佛山仙湖实验室 | Multichannel PEM pure water electrolysis hydrogen production testing device and application method |
| CN115029733A (en) * | 2022-06-23 | 2022-09-09 | 中国船舶重工集团公司第七一八研究所 | System and method for regulating and controlling flow of alkaline liquor of many-to-one water electrolysis hydrogen production device |
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