CN115874195A - Pure water electrolysis hydrogen production system - Google Patents
Pure water electrolysis hydrogen production system Download PDFInfo
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- CN115874195A CN115874195A CN202211538762.8A CN202211538762A CN115874195A CN 115874195 A CN115874195 A CN 115874195A CN 202211538762 A CN202211538762 A CN 202211538762A CN 115874195 A CN115874195 A CN 115874195A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention provides a pure water electrolysis hydrogen production system, which comprises a pure water tank, an external circulating pump, a heat exchanger, an external filtering device, an internal circulating filtering system and a differential pressure type PEM electrolytic cell; the external filtering device comprises a first polishing mixed bed resin tank and a first precision filter, wherein the outlet of the first polishing mixed bed resin tank is communicated with the inlet of the first precision filter, the outlet of the first precision filter is communicated with the inlet of the internal circulation filtering system, and the outlet of the internal circulation filtering system is communicated with the pure water inlet of the differential pressure type PEM electrolytic cell; the internal circulation filtering system comprises an internal circulation cache water tank, an internal circulation pump, a second polishing mixed bed resin tank and a second precision filter. The pure water electrolysis hydrogen production system can reduce the problem of low pure water resistivity caused by external air pollution, temperature rise, membrane electrode surface catalyst falling and the like, thereby prolonging the service life of the differential pressure type PEM electrolytic cell and reducing the waste of pure water.
Description
Technical Field
The invention relates to the technical field of electrolytic hydrogen production, in particular to a pure water electrolytic hydrogen production system.
Background
Hydrogen is used as a substitute of traditional fossil energy and is vigorously popularized and supported by the nation in recent years. The technology of electrolytic hydrogen production is widely mentioned, and numerous enterprises at home and abroad have laid out the electrolytic hydrogen production industry. Compared with the mature alkaline process hydrogen production technology (ALK), the PEM (proton exchange membrane) electrolysis hydrogen production technology has the advantages of no pollution of electrolyzed pure water, capability of adapting to the power fluctuation of renewable energy sources, hydrogen production purity of more than 99.999 percent, small occupied area and the like, and is widely applied to the fields of power plants, electronic factories, transportation industries, fuel cells and new energy substitution.
The electrolyte of the PEM electrolytic cell is pure water, the PEM electrolytic technology mainly utilizes hydrogen ions in the pure water to pass through a proton exchange membrane to be combined with electrons to form hydrogen atoms, and the hydrogen atoms are combined with each other to form hydrogen molecules to finally obtain the hydrogen. A core component PEM electrolytic cell (PEM membrane electrode) of the PEM electrolytic hydrogen production technology is designed in a differential pressure mode, the hydrogen outlet side is high in pressure (more than or equal to 3 MPa), the oxygen outlet side is normal in pressure, and the differential pressure of the two sides of the PEM membrane electrode is more than 30 times. The PEM electrolyzer has the advantage of ensuring the hydrogen production purity to be over 99.999 percent, but the hydrogen easily permeates to the oxygen side due to the differential pressure effect, so that the hydrogen content in the oxygen is increased, and the explosion hazard is easily generated (the explosion range of the hydrogen in the oxygen is 4 to 93 percent). Most PEM hydrogen production devices adopt low-permeability membrane electrodes to prepare hydrogen, in order to solve the danger caused by hydrogen permeation, a fan is required to be adopted to pump air into a gas-liquid separator (pure water tank) to dilute and discharge the hydrogen, and the fan pumps the air into the pure water tank to cause the resistivity of pure water to slide down rapidly. In addition, in the pure water circulation process, the pure water resistivity is reduced due to the increase of temperature, and the pure water quality is polluted by the catalyst on the membrane electrode surface layer under the condition that the catalyst is washed in the long-time operation, so that the pure water resistivity is reduced, and the pure water resistivity is kept about 1M omega cm or even lower than 1M omega cm for a long time when the PEM hydrogen production device normally works (the PEM hydrogen production device generally requires the pure water resistivity to be higher than 10M omega cm). The above influence factors are ranked from high to low, namely air pollution, temperature rise and catalyst shedding.
The problem of low pure water resistivity can not affect the performance of the electrolytic cell in a short time, the long-term operation can accelerate the service life attenuation of the electrolytic cell, the cost of the electrolytic cell accounts for more than 70 percent of the system, and the cost of replacing the electrolytic cell is high. Aiming at the problem of low resistivity of pure water, the solution adopted by some manufacturers is to keep a drainage state all the time, so that new pure water continuously enters a pure water tank to keep a high resistivity value, and the pure water is seriously wasted and cannot be applied to actual production projects.
Disclosure of Invention
The invention aims to provide a pure water electrolysis hydrogen production system which can solve the problem of low pure water resistivity caused by external air pollution, temperature rise, membrane electrode surface catalyst falling off and the like, thereby prolonging the service life of a differential pressure type PEM electrolytic cell and reducing the waste of pure water.
The invention provides a pure water electrolysis hydrogen production system, which comprises a pure water tank, an external circulating pump, a heat exchanger, an external filtering device, an internal circulating filtering system and a differential pressure type PEM electrolytic cell;
an outlet of the pure water tank is communicated with an inlet of the external circulating pump, and an outlet of the external circulating pump is communicated with an inlet of the heat exchanger; the external filtering device comprises a first polishing mixed bed resin tank and a first precision filter, the outlet of the heat exchanger is communicated with the inlet of the first polishing mixed bed resin tank, the outlet of the first polishing mixed bed resin tank is communicated with the inlet of the first precision filter, the outlet of the first precision filter is communicated with the inlet of the internal circulation filtering system, the outlet of the internal circulation filtering system is communicated with the pure water inlet of the differential pressure type PEM electrolytic tank, and the circulating water outlet of the differential pressure type PEM electrolytic tank is communicated with the inlet of the pure water tank;
the internal circulation filtering system comprises an internal circulation cache water tank, an internal circulation pump, a second polishing mixed bed resin tank and a second precision filter, wherein an outlet of the internal circulation cache water tank is communicated with an inlet of the internal circulation pump, an outlet of the internal circulation pump is divided into two paths, one path of outlet is communicated with a pure water inlet of the differential pressure type PEM electrolytic tank, the other path of outlet is communicated with an inlet of the second polishing mixed bed resin tank, an outlet of the second polishing mixed bed resin tank is communicated with an inlet of the second precision filter, and an outlet of the second precision filter is communicated with an inlet of the internal circulation cache water tank; and the outlet of the first precision filter is communicated with the inlet of the internal circulation cache water tank or the inlet of the second polishing mixed bed resin tank.
Wherein, the pure water tank is used for storing the pure water to oxygen and pure water separation from differential PEM electrolysis trough make the pure water can cyclic utilization. The heat exchanger is used for reducing the temperature of the pure water in the pure water tank so that the temperature of the pure water meets the water inlet temperature of the differential pressure type PEM electrolytic cell. The internal circulation buffer water tank is used for storing purified pure water. The pressure difference type PEM electrolyzer is used for electrolyzing pure water to generate hydrogen and oxygen, and the oxygen generated by electrolysis and the pure water not electrolyzed return to the pure water tank together;
polishing resin is arranged in a first polishing mixed bed resin tank in the external filtering device and is used for purifying the water quality of the pure water in the pure water tank so as to improve the resistivity, and a first precision filter is used for intercepting particles with the particle size of more than 0.01um, such as catalyst falling, pollution of other equipment of a system, air pollution or resin falling of the polishing resin tank; the external filtering device can increase the resistivity of the pure water from less than 1M omega cm to more than 5M omega cm;
polishing resin is arranged in a second polishing mixed bed resin tank in the internal circulation filtering system and is used for purifying the pure water filtered by the external filtering device or the pure water in the internal circulation buffer water tank again so as to improve the resistivity, and a second precision filter removes particles with the thickness of more than 0.01um, such as resin falling of the polishing resin tank, again; the resistivity of the pure water treated by the second polishing mixed bed resin tank and the second precision filter is more than 18M omega cm. Simultaneously, inner loop buffer memory water tank is for sealing the water tank, can solve before the pure water gets into the differential type PEM electrolysis trough with the air contact and reduce the problem of resistivity, and inner loop buffer memory water tank can also balance the water pressure and the flow that get into the water pressure of the preceding pure water of differential type PEM electrolysis trough simultaneously, avoids the pure water to pass through the electrolysis trough hydrogen production efficiency decline that the fluctuation of water pressure of direct entering differential type PEM electrolysis trough caused behind the clarifier.
Further, the external filtering device comprises at least two first polishing mixed-bed resin tanks, the at least two first polishing mixed-bed resin tanks are arranged in parallel, inlets of the at least two first polishing mixed-bed resin tanks are communicated with an outlet of the heat exchanger after being connected in parallel, and outlets of the at least two first polishing mixed-bed resin tanks are communicated with an inlet of the first precision filter after being connected in parallel.
Furthermore, the internal circulation filtering system comprises at least two second polishing mixed-bed resin tanks, the at least two second polishing mixed-bed resin tanks are arranged in parallel, inlets of the at least two second polishing mixed-bed resin tanks are communicated with an outlet of the internal circulation pump after being connected in parallel, and outlets of the at least two second polishing mixed-bed resin tanks are communicated with an inlet of the second precision filter after being connected in parallel.
Furthermore, a first resistivity meter is arranged on the pure water tank and used for detecting the resistivity of the pure water in the pure water tank. When the first resistivity meter detects that the resistivity of the pure water in the pure water tank does not reach the standard, the pure water electrolytic hydrogen production system sends out corresponding alarm information; when the first resistivity meter detects that the resistivity of the pure water in the pure water tank does not reach the standard and is lower than the lower limit value, the pure water electrolytic hydrogen production system is shut down and prompts that the polishing mixed bed resin tank (the first polishing mixed bed resin tank) needs to be replaced.
Furthermore, a second resistivity meter is arranged on the internal circulation cache water tank and used for detecting the resistivity of pure water in the internal circulation cache water tank, and the set water quality standard resistivity value of the second resistivity meter is higher than the set water quality standard resistivity value of the first resistivity meter. When the second resistivity meter detects that the resistivity of the pure water in the internal circulation cache water tank does not reach the standard, the pure water electrolytic hydrogen production system sends out corresponding alarm information; when the second resistivity meter detects that the resistivity of the pure water in the internal circulation cache water tank does not reach the standard and is lower than the lower limit value, the pure water electrolytic hydrogen production system is shut down and the polishing mixed bed resin tank (the second polishing mixed bed resin tank) is prompted to be replaced.
Further, the pure water electrolytic hydrogen production system also comprises a first filter and a second filter, wherein the first filter is arranged on a pipeline between the outlet of the external circulating pump and the inlet of the heat exchanger, and the second filter is arranged on a pipeline between the outlet of the internal circulating pump and the pure water inlet of the differential pressure type PEM electrolytic cell.
Furthermore, the pure water electrolysis hydrogen production system also comprises a water supplementing pipeline, the water supplementing pipeline is communicated with the inlet of the internal circulation cache water tank, and a water inlet valve is arranged on the water supplementing pipeline.
Furthermore, the pure water electrolysis hydrogen production system also comprises a first water discharge pipeline and a second water discharge pipeline, wherein the first water discharge pipeline is communicated with an outlet of the pure water tank, the second water discharge pipeline is communicated with an outlet of the internal circulation cache water tank, a first water discharge valve is arranged on the first water discharge pipeline, and a second water discharge valve is arranged on the second water discharge pipeline; a first liquid level meter is arranged on the pure water tank and is in signal connection with the external circulating pump and the first drain valve at the same time; and a second liquid level meter is arranged on the internal circulation cache water tank and is simultaneously in signal connection with the internal circulation pump, the water inlet valve and the second water discharge valve. The first water discharge pipeline is used for discharging pure water in the pure water tank, and the second water discharge pipeline is used for discharging the pure water in the internal circulation buffer water tank. The first liquid level meter is used for detecting the liquid level of pure water in the pure water tank, and the second liquid level meter is used for detecting the liquid level of pure water in the internal circulation buffer water tank.
Further, the first liquid level meter comprises a first low liquid level point, a first medium liquid level point, a first high liquid level point and a first high liquid level point which are sequentially arranged on the pure water tank from bottom to top;
when the liquid level in the pure water tank is lower than the first low liquid level point, the external circulating pump stops running; when the liquid level height in the pure water tank is greater than or equal to the first middle liquid point, the external circulating pump is started;
when the liquid level in the pure water tank is lower than the first neutral point, the first drain valve is closed; when the liquid level height in the pure water tank is greater than or equal to the first high liquid level point, the first drain valve is opened;
and when the liquid level in the pure water tank is higher than or equal to the first high liquid level point, the pure water electrolytic hydrogen production system stops working.
Further, the second liquid level meter comprises a second low liquid level point, a second medium liquid level point, a medium high liquid level point, a second high liquid level point and a second high liquid level point which are sequentially arranged on the internal circulation cache water tank from bottom to top;
when the liquid level in the internal circulation cache water tank is lower than the second low liquid level point, the internal circulation pump stops running; when the liquid level in the internal circulation cache water tank is higher than or equal to the second middle liquid level point, the internal circulation pump is started;
when the liquid level in the internal circulation cache water tank is lower than the second neutral point, the water inlet valve is opened; when the liquid level in the internal circulation cache water tank is higher than or equal to the middle-high liquid level point, the water inlet valve is closed;
when the liquid level in the internal circulation buffer water tank is lower than the middle-high liquid level point, the second drain valve is closed; when the liquid level in the internal circulation cache water tank is greater than or equal to the second high liquid level point, the second drain valve is opened;
and when the liquid level in the internal circulation cache water tank is higher than or equal to the second high liquid level point, the pure water electrolytic hydrogen production system stops working.
Furthermore, a temperature sensor is arranged on the pure water tank and is in signal connection with the heat exchanger. The temperature sensor is used for detecting the temperature of pure water in the pure water tank, and the temperature sensor controls the water quantity of cooling water in the heat exchanger in real time according to the temperature change of the pure water in the pure water tank, so that the water inlet temperature of the electrolytic bath is kept stable, and the optimal hydrogen production efficiency is kept.
Further, an air filter is arranged on the pure water tank, and external air can enter the pure water tank after being filtered by the air filter; the pure water electrolysis hydrogen production system further comprises an exhaust pipeline, the exhaust pipeline is communicated with the top of the pure water tank, a fan is arranged on the exhaust pipeline, and the fan is used for pumping gas in the pure water tank out of the pure water tank.
Further, a combustible gas alarm is arranged on the pure water tank and used for detecting the hydrogen content in the pure water tank. When the combustible gas alarm instrument detects that the content of hydrogen in the pure water tank exceeds the standard, the pure water electrolysis hydrogen production system alarms; and when the combustible gas alarm detects that the content of hydrogen in the pure water tank exceeds the standard and exceeds the upper limit value, the pure water electrolytic hydrogen production system is shut down.
Furthermore, a first check valve is arranged on a pipeline between the outlet of the heat exchanger and the inlet of the first polishing mixed bed resin tank, and a second check valve is arranged on a pipeline between the outlet of the internal circulating pump and the inlet of the second polishing mixed bed resin tank. The first check valve and the second check valve are used for preventing the pure water in the pipeline from flowing backwards.
Furthermore, the heat exchanger is a pollution-free all-steel brazed plate heat exchanger.
Furthermore, all pipelines in the pure water tank, the internal circulation cache water tank and the system are made of pollution-free PP materials, so that pollution to pure water is avoided.
Further, the pure water electrolysis hydrogen production system also comprises a hydrogen separator, a cooler and a hydrogen dryer, wherein a hydrogen outlet of the differential pressure type PEM electrolytic tank is communicated with an inlet of the hydrogen separator, an outlet of the hydrogen separator is communicated with an inlet of the cooler, and an outlet of the cooler is communicated with an inlet of the hydrogen dryer. The hydrogen separator is used for separating hydrogen from water, the cooler is used for cooling the hydrogen, and the hydrogen drier is used for drying and purifying the hydrogen.
According to the pure water electrolysis hydrogen production system provided by the invention, the heat exchanger is arranged, and the temperature of the pure water is reduced by the heat exchanger, so that the temperature of the pure water meets the water inlet temperature of the differential pressure type PEM electrolytic tank, and the problem of pure water resistivity reduction caused by pure water temperature rise is solved. By arranging multistage filtering equipment such as an external filtering device and an internal circulation filtering system, the catalyst and air pollutants falling off from the surface layer of the membrane electrode can be effectively filtered, so that the problem of pure water resistivity reduction caused by the falling off of the catalyst on the surface layer of the membrane electrode and external air pollution is solved; simultaneously, this pure water electrolysis hydrogen manufacturing system is through setting up two water tanks (pure water tank + inner loop buffer memory water tank), and the inner loop buffer memory water tank is for sealing the water tank, can solve before the pure water gets into the differential type PEM electrolysis trough with the air contact and reduce the problem of resistivity, the water pressure and the flow of pure water before the differential type PEM electrolysis trough can also balanced entering simultaneously in the inner loop buffer memory water tank, avoid the pure water to directly get into the hydrogen production efficiency decline of electrolysis trough that the water pressure fluctuation of differential type PEM electrolysis trough caused after passing through the clarifier. Moreover, the water quality of the pure water can be improved to a higher level through the circulating filtration of the internal circulating filtration system, so that the hydrogen production efficiency is further improved.
The pure water electrolysis hydrogen production system can solve the problem of low pure water resistivity caused by external air pollution, temperature rise, membrane electrode surface catalyst falling off and the like, thereby prolonging the service life of the differential pressure type PEM electrolyzer and improving the hydrogen production efficiency; and the frequent discharge of the pure water can be avoided, and the waste of the pure water is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a pure water electrolytic hydrogen production system in an embodiment of the invention.
FIG. 2 is a schematic diagram of a system for producing hydrogen by electrolyzing pure water according to another embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a pure water electrolytic hydrogen production system in another embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The terms first, second, third, fourth and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
As shown in fig. 1, the pure water electrolytic hydrogen production system provided by the embodiment of the invention comprises a pure water tank 1, an external circulating pump 2, a heat exchanger 3, an external filtering device 4, an internal circulating filtering system 5 and a differential pressure type PEM electrolyzer 6;
the outlet of the pure water tank 1 is communicated with the inlet of an external circulating pump 2, and the outlet of the external circulating pump 2 is communicated with the inlet of a heat exchanger 3; the external filtering device 4 comprises a first polishing mixed bed resin tank 41 and a first precision filter 42, the outlet of the heat exchanger 3 is communicated with the inlet of the first polishing mixed bed resin tank 41, the outlet of the first polishing mixed bed resin tank 41 is communicated with the inlet of the first precision filter 42, the outlet of the first precision filter 42 is communicated with the inlet of the internal circulation filtering system 5, the outlet of the internal circulation filtering system 5 is communicated with the pure water inlet of the differential pressure type PEM electrolytic tank 6, and the circulating water outlet of the differential pressure PEM electrolytic tank 6 is communicated with the inlet of the pure water tank 1;
the internal circulation filtering system 5 comprises an internal circulation cache water tank 51, an internal circulation pump 52, a second polishing mixed bed resin tank 53 and a second precision filter 54, wherein an outlet of the internal circulation cache water tank 51 is communicated with an inlet of the internal circulation pump 52, an outlet of the internal circulation pump 52 is divided into two paths, one path of outlet is communicated with a pure water inlet of the differential pressure type PEM electrolytic tank 6, the other path of outlet is communicated with an inlet of the second polishing mixed bed resin tank 53, an outlet of the second polishing mixed bed resin tank 53 is communicated with an inlet of the second precision filter 54, and an outlet of the second precision filter 54 is communicated with an inlet of the internal circulation cache water tank 51; the outlet of the first fine filter 42 communicates with the inlet of the internal circulation buffer tank 51.
Wherein the pure water tank 1 is used for storing pure water and separating oxygen from the differential pressure type PEM electrolyzer 6 from the pure water, so that the pure water can be recycled. The heat exchanger 3 is used for reducing the temperature of the pure water in the pure water tank 1 so that the temperature of the pure water meets the inlet water temperature of the differential pressure type PEM electrolyzer 6. The internal circulation buffer water tank 51 is used for storing purified pure water. The pressure difference type PEM electrolyzer 6 is used for electrolyzing pure water to generate hydrogen and oxygen, and the oxygen generated by electrolysis and the pure water which is not electrolyzed are returned to the pure water tank 1 together.
Polishing resin is arranged in a first polishing mixed bed resin tank 41 in the external filtering device 4 and is used for purifying the water quality of the pure water in the pure water tank 1 so as to improve the resistivity, and a first precision filter 42 is used for intercepting particles with the thickness of more than 0.01um, such as catalyst falling, pollution of other equipment of a system, air pollution or resin falling of the polishing resin tank; the external filter device 4 can raise the resistivity of pure water from less than 1M Ω · cm to more than 5M Ω · cm.
Polishing resin is arranged in a second polishing mixed bed resin tank 53 in the internal circulation filtering system 5 and is used for purifying the pure water filtered by the external filtering device 4 or the pure water in the internal circulation cache water tank 51 again to improve the resistivity, and particles of more than 0.01um such as resin falling off of the polishing resin tank are removed again by a second precision filter 54; the resistivity of pure water after the treatment by the second polishing mixed bed resin tank 53 and the second precision filter 54 is more than 18 M.OMEGA.cm. Simultaneously, inner loop buffer memory water tank 51 is for sealing the water tank, can solve the problem that the pure water gets into before the differential type PEM electrolysis trough 6 and reduce the resistivity with the air contact, and inner loop buffer memory water tank 51 can also balance the water pressure and the flow that get into the differential type PEM electrolysis trough 6 preceding pure water simultaneously, avoids the pure water to pass through behind the clarifier direct electrolytic cell hydrogen production efficiency decline that the water pressure fluctuation that gets into differential type PEM electrolysis trough 6 caused.
By the double purification measures, it can be ensured that the resistivity of the pure water in the internal circulation buffer water tank 51 (i.e. after entering the electrolytic cell) is always kept higher than 10M Ω · cm.
Specifically, the pure water electrolysis hydrogen production system that this embodiment provided utilizes heat exchanger 3 to reduce the temperature of pure water through setting up heat exchanger 3, makes the temperature of pure water satisfy the temperature of intaking of differential PEM electrolysis trough 6 to solve the problem that leads to the pure water resistivity to descend because of the pure water temperature risees. By arranging the multistage filtering devices such as the external filtering device 4 and the internal circulating filtering system 5, the catalyst and air pollutants falling off from the surface layer of the membrane electrode can be effectively filtered, so that the problem of reduction of the resistivity of pure water caused by the falling off of the catalyst on the surface layer of the membrane electrode and the pollution of external air is solved; simultaneously, this pure water electrolysis hydrogen manufacturing system is through setting up two water tanks (pure water tank 1+ inner loop buffer memory water tank 51), and inner loop buffer memory water tank 51 is for sealing the water tank, can solve before the pure water gets into differential PEM electrolysis trough 6 with the air contact and reduce the problem of resistivity, inner loop buffer memory water tank 51 can also balance the water pressure and the flow that get into the preceding pure water of differential PEM electrolysis trough 6, avoid the pure water to directly get into the electrolysis trough hydrogen production efficiency decline that the water pressure fluctuation of differential PEM electrolysis trough 6 caused behind the clarifier. Moreover, the water quality of the pure water can be improved to a higher level through the circulating filtration of the internal circulating filtration system 5, so that the hydrogen production efficiency is further improved.
The pure water electrolysis hydrogen production system can solve the problem of low pure water resistivity caused by external air pollution, temperature rise, membrane electrode surface catalyst falling off and the like, thereby prolonging the service life of the differential pressure type PEM electrolytic cell 6 and improving the hydrogen production efficiency; and the frequent discharge of the pure water can be avoided, and the waste of the pure water is reduced.
As another embodiment, as shown in FIG. 2, the outlet of the first fine filter 42 is communicated with the inlet of the second mixed bed polishing resin tank 53. This arrangement allows pure water entering the internal circulation buffer tank 51 to undergo two times of purification filtration, thereby further improving the quality of pure water (but this way increases the throughput of the second polishing mixed bed resin tank 53 and the second precision filter 54).
As shown in fig. 3, as another embodiment, the external filtering device 4 includes at least two first polishing mixed bed resin tanks 41 (two first polishing mixed bed resin tanks 41 are illustrated in the figure), the at least two first polishing mixed bed resin tanks 41 are arranged in parallel, inlets of the at least two first polishing mixed bed resin tanks 41 are connected in parallel and then communicated with an outlet of the heat exchanger 3, and outlets of the at least two first polishing mixed bed resin tanks 41 are connected in parallel and then communicated with an inlet of the first fine filter 42. The branch at each first polishing mixed bed resin tank 41 is provided with a first valve 44, and by switching the first valves 44, different first polishing mixed bed resin tanks 41 can be put into use (namely, when one first polishing mixed bed resin tank 41 fails to be replaced, the first polishing mixed bed resin tank 41 can be switched to other first polishing mixed bed resin tanks 41 to be used), so that the working time of the pure water electrolysis hydrogen production system is prolonged (because polishing resin is a consumable product and cannot be regenerated, when the pure water electrolysis hydrogen production system needs to work uninterruptedly, the replacement and switching use functions of polishing resin need to be considered). Meanwhile, a pressure gauge, a flow meter or a resistivity meter and the like can be arranged on a branch where each first polishing mixed bed resin tank 41 is located to detect whether the polishing resin is invalid, and when the polishing resin in the first polishing mixed bed resin tank 41 on the branch is invalid, the system is automatically switched to other first polishing mixed bed resin tanks 41 to be used, so that the normal use of the pure water electrolytic hydrogen production system is ensured.
As shown in fig. 3, as another embodiment, the internal circulation filtration system 5 includes at least two second polishing mixed-bed resin tanks 53 (two second polishing mixed-bed resin tanks 53 are illustrated in the figure), the at least two second polishing mixed-bed resin tanks 53 are arranged in parallel, inlets of the at least two second polishing mixed-bed resin tanks 53 are connected in parallel and then communicated with an outlet of the internal circulation pump 52, and outlets of the at least two second polishing mixed-bed resin tanks 53 are connected in parallel and then communicated with an inlet of the second fine filter 54. Each branch where the second polishing mixed-bed resin tank 53 is located is provided with a second valve 56, and by switching the second valves 56, different second polishing mixed-bed resin tanks 53 can be put into use (that is, when one second polishing mixed-bed resin tank 53 fails to be replaced, the second polishing mixed-bed resin tank 53 can be switched to other second polishing mixed-bed resin tanks 53 to be used), so that the working time of the pure water electrolysis hydrogen production system is prolonged. Meanwhile, a pressure gauge, a flow meter or a resistivity meter and the like can be arranged on a branch where each second polishing mixed bed resin tank 53 is located to detect whether the polishing resin is invalid, and when the polishing resin in the second polishing mixed bed resin tank 53 on the branch is invalid, the system is automatically switched to other second polishing mixed bed resin tanks 53 to be used, so that the normal use of the pure water electrolytic hydrogen production system is ensured.
Further, as shown in fig. 1, in the present embodiment, the pure water tank 1 is provided with a first resistivity meter 11, and the first resistivity meter 11 is used for detecting the resistivity of the pure water in the pure water tank 1; when the first resistivity meter 11 detects that the resistivity of the pure water in the pure water tank 1 does not reach the standard, the pure water electrolytic hydrogen production system sends out corresponding alarm information; when the first resistivity meter 11 detects that the resistivity of the pure water in the pure water tank 1 does not reach the standard and is lower than the lower limit value, the pure water electrolytic hydrogen production system is shut down and the polishing mixed bed resin tank (the first polishing mixed bed resin tank 41) needs to be replaced.
Further, as shown in fig. 1, in the present embodiment, a second resistivity meter 511 is disposed on the internal circulation buffer water tank 51, the second resistivity meter 511 is used for detecting the resistivity of pure water (i.e. the resistivity of the inlet water of the electrolytic cell) in the internal circulation buffer water tank 51, and the set water quality standard resistivity value is higher than the water quality standard resistivity value set by the first resistivity meter 11. When the second resistivity meter 511 detects that the resistivity of the pure water in the internal circulation cache water tank 51 does not reach the standard, the pure water electrolytic hydrogen production system sends corresponding alarm information; when the second resistivity meter 511 detects that the resistivity of the pure water in the internal circulation cache water tank 51 does not reach the standard and is lower than the lower limit value, the pure water electrolytic hydrogen production system is shut down and the polishing mixed bed resin tank (the second polishing mixed bed resin tank 53) is prompted to be replaced.
Further, as shown in fig. 1, in the present embodiment, the pure water electrolytic hydrogen production system further includes a first filter 71 and a second filter 72, the first filter 71 is disposed on the pipeline between the outlet of the external circulation pump 2 and the inlet of the heat exchanger 3, and the second filter 72 is disposed on the pipeline between the outlet of the internal circulation pump 52 and the pure water inlet of the differential pressure type PEM electrolyzer 6. The first filter 71 and the second filter 72 serve to further filter impurities in the system.
Specifically, in the present embodiment, the first filter 71 and the second filter 72 are both wire mesh filters, and are mainly used for intercepting foreign particles in the pure water to protect subsequent equipment.
Further, as shown in fig. 1, in this embodiment, the pure water electrolysis hydrogen production system further includes a water replenishing pipeline 81, the water replenishing pipeline 81 is communicated with an inlet of the internal circulation cache water tank 51, a water inlet valve 811 is disposed on the water replenishing pipeline 81, and the water replenishing pipeline 81 is used for replenishing pure water into the internal circulation cache water tank 51.
Further, as shown in fig. 1, in the present embodiment, the pure water electrolysis hydrogen production system further includes a first drain pipe 82 and a second drain pipe 83, the first drain pipe 82 is communicated with an outlet of the pure water tank 1, the second drain pipe 83 is communicated with an outlet of the internal circulation cache water tank 51, the first drain pipe 82 is provided with a first drain valve 821, and the second drain pipe 83 is provided with a second drain valve 831; a first liquid level meter 12 is arranged on the pure water tank 1, and the first liquid level meter 12 is in signal connection with the external circulating pump 2 and the first drain valve 821 at the same time; the internal circulation buffer water tank 51 is provided with a second liquid level meter 512, and the second liquid level meter 512 is in signal connection with the internal circulation pump 52, the water inlet valve 811 and a second water discharge valve 831.
Specifically, the first drain line 82 is used to discharge pure water in the pure water tank 1, and the second drain line 83 is used to discharge pure water in the internal circulation buffer water tank 51. The first liquid level gauge 12 is used for detecting the level of pure water in the pure water tank 1, and the second liquid level gauge 512 is used for detecting the level of pure water in the internal circulation buffer water tank 51.
Further, in this embodiment, the first liquid level meter 12 includes four liquid level feedback points, namely, a first low liquid level point (not shown), a first middle liquid level point, a first high liquid level point, and a first high liquid level point, which are sequentially disposed on the pure water tank 1 from bottom to top, and heights of the first low liquid level point, the first middle liquid level point, the first high liquid level point, and the first high liquid level point sequentially increase;
when the liquid level in the pure water tank 1 is lower than the first low liquid level point, the external circulating pump 2 stops running; when the liquid level height in the pure water tank 1 is greater than or equal to the first middle liquid level point, the external circulating pump 2 is started;
when the liquid level in the pure water tank 1 is lower than the first neutral point, the first drain valve 821 is closed; when the liquid level in the pure water tank 1 is higher than or equal to the first high liquid level point, the first drain valve 821 is opened;
and when the liquid level in the pure water tank 1 is higher than or equal to the first high liquid level point, the pure water electrolytic hydrogen production system stops working.
Further, in this embodiment, the second liquid level meter 512 includes five liquid level feedback points, which are sequentially disposed on the internal circulation cache water tank 51 from bottom to top, including a second low liquid level point (not shown), a second middle liquid level point, a middle high liquid level point, a second high liquid level point, and a second high liquid level point, that is, the heights of the second low liquid level point, the second middle liquid level point, the middle high liquid level point, the second high liquid level point, and the second high liquid level point are sequentially increased;
when the liquid level in the internal circulation buffer water tank 51 is lower than the second low liquid level point, the internal circulation pump 52 stops operating; when the liquid level in the internal circulation cache water tank 51 is greater than or equal to the second middle liquid level point, the internal circulation pump 52 is started;
when the liquid level in the internal circulation cache water tank 51 is lower than the second middle liquid level point, the water inlet valve 811 is opened; when the liquid level in the internal circulation cache water tank 51 is higher than or equal to the middle-high liquid level, the water inlet valve 811 is closed;
when the liquid level in the internal circulation cache water tank 51 is lower than the middle-high liquid level point, the second drain valve 831 is closed; when the liquid level in the internal circulation cache water tank 51 is greater than or equal to the second high liquid level point, the second drain valve 831 is opened;
and when the liquid level in the internal circulation cache water tank 51 is higher than or equal to the second high liquid level point, the pure water electrolytic hydrogen production system stops working.
Specifically, control the liquid level height of pure water in pure water tank 1 and the inner loop buffer water tank 51 through above-mentioned mode, can further stably get into water pressure and the flow of pure water before the differential PEM electrolysis trough 6, prolong the life of electrolysis trough, promote hydrogen production efficiency for hydrogen production purity can keep being greater than 99.999%, and solve the extravagant problem of pure water discharge.
Further, as shown in fig. 1, in the present embodiment, a temperature sensor 13 is disposed on the pure water tank 1, and the temperature sensor 13 is in signal connection with the heat exchanger 3. The temperature sensor 13 is used for detecting the temperature of the pure water in the pure water tank 1, and the temperature sensor 13 controls the water quantity of the cooling water in the heat exchanger 3 in real time according to the temperature change of the pure water in the pure water tank 1, so that the water inlet temperature of the electrolytic cell is kept stable (for example, kept at 30-50 ℃), and the optimal hydrogen production efficiency is kept; when the temperature value of the pure water in the pure water tank 1 does not reach the standard, the pure water electrolysis hydrogen production system gives an alarm, and when the temperature value of the pure water in the pure water tank 1 does not reach the standard and exceeds the upper limit value, the pure water electrolysis hydrogen production system is shut down.
Further, as shown in fig. 1, in the present embodiment, the pure water tank 1 is an open water tank, an air filter 16 is disposed on the pure water tank 1, and external air can enter the pure water tank 1 after being filtered by the air filter 16; the pure water electrolysis hydrogen production system further comprises an exhaust pipeline 14, the exhaust pipeline 14 is communicated with the top of the pure water tank 1, a fan 141 is arranged on the exhaust pipeline 14, and the fan 141 is used for pumping gas in the pure water tank 1 out of the pure water tank 1.
Specifically, under the suction effect of fan 141, outside air can enter into pure water tank 1 after air cleaner 16 filters to dilute the oxygen in pure water tank 1, the oxygen after air dilution is taken out to the outside of pure water tank 1 again through fan 141 and is discharged to the atmosphere side by side, thereby separates oxygen and pure water in pure water tank 1.
Further, as shown in fig. 1, in the present embodiment, a combustible gas alarm 15 is provided on the pure water tank 1, and the combustible gas alarm 15 is used for detecting the hydrogen content in the pure water tank 1. When the combustible gas alarm instrument 15 detects that the hydrogen content in the pure water tank 1 exceeds the standard (namely, the hydrogen concentration leaked from the electrolytic bath into the pure water tank 1 is too high), the pure water electrolytic hydrogen production system alarms; and when the combustible gas alarm 15 detects that the content of the hydrogen in the pure water tank 1 exceeds the standard and exceeds the upper limit value, the pure water electrolytic hydrogen production system is shut down.
Further, as shown in fig. 1, in the present embodiment, a first check valve 43 is provided on a pipe between an outlet of the heat exchanger 3 and an inlet of the first polishing mixed bed resin tank 41, and a second check valve 55 is provided on a pipe between an outlet of the internal circulation pump 52 and an inlet of the second polishing mixed bed resin tank 53. The first check valve 43 and the second check valve 55 serve to prevent the reverse flow of pure water in the pipeline.
Further, in the present embodiment, the heat exchanger 3 is a non-pollution all-steel brazed plate heat exchanger, the volume is small, and the steel material is non-pollution to pure water.
Further, in the present embodiment, the pure water tank 1, the internal circulation buffer water tank 51 and all the pipes in the system are made of non-pollution PP material to avoid pollution to pure water. Meanwhile, all the electrical equipment in the system is explosion-proof equipment.
Further, as shown in fig. 1, in the present embodiment, the pure water electrolytic hydrogen production system further includes a hydrogen separator 91, a cooler 92, and a hydrogen dryer 93, wherein the hydrogen outlet of the differential pressure type PEM electrolyzer 6 is communicated with the inlet of the hydrogen separator 91, the outlet of the hydrogen separator 91 is communicated with the inlet of the cooler 92, and the outlet of the cooler 92 is communicated with the inlet of the hydrogen dryer 93.
Specifically, the hydrogen separator 91 is used for separating hydrogen from water, the cooler 92 is used for cooling the hydrogen, and the hydrogen dryer 93 is used for drying and purifying the hydrogen. The hydrogen dryers 93 adopt a double tower structure in which one of the hydrogen dryers 93 performs an adsorption function and the other hydrogen dryer 93 performs a regeneration function. The hydrogen produced by the pressure difference type PEM electrolytic tank 6 firstly enters a hydrogen separator 91 to separate hydrogen from water, then enters a cooler 92 to be cooled and condense part of water vapor, then enters a hydrogen dryer 93 to be dried and purified, and the purity of the dried hydrogen can reach more than 99.999 percent so as to meet the requirements of users.
The work flow of the pure water electrolysis hydrogen production system in the embodiment is as follows:
1. after the pure water electrolysis hydrogen production system is started, the fan 141 is started firstly to ensure that the air in the pure water tank 1 is smooth; simultaneously, a water inlet valve 811 is opened to supplement pure water into the internal circulation cache water tank 51 until the liquid level in the internal circulation cache water tank 51 reaches a medium-high liquid level point; when the liquid level of the water supplemented to the internal circulation buffer water tank 51 reaches a second middle liquid level point, the internal circulation pump 52 is started, and the differential pressure type PEM electrolyzer 6 is started for electrolysis.
2. The pure water enters the pressure difference type PEM electrolytic tank 6 for electrolysis after passing through the internal circulating pump 52 and the second filter 72 to generate hydrogen and oxygen, the pressure difference type PEM electrolytic tank 6 is designed in a pressure difference mode, one side of a hydrogen outlet is high pressure (more than 3 MPa), and one side of an oxygen outlet is normal pressure. Hydrogen generated by electrolysis firstly enters a hydrogen separator 91 to separate hydrogen from water, then enters a cooler 92 to be cooled and condensed, then enters a hydrogen drier 93 to be dried and purified, and the purity of the dried hydrogen can reach more than 99.999 percent; a back pressure valve (not shown) is arranged on one side of the hydrogen outlet, and the like to keep the pressure on the hydrogen side at high pressure, and then the pressure can be adjusted to the pressure required by a user through a pressure reducing valve (not shown) for discharging.
3. Oxygen generated by the electrolysis of the differential pressure type PEM electrolytic cell 6 and pure water which is not electrolyzed return to the pure water tank 1 together, and most of the pure water carries away the heat of the differential pressure type PEM electrolytic cell 6 with the oxygen to maintain the working temperature of the electrolytic cell because the consumption of the pure water in the differential pressure type PEM electrolytic cell 6 is very small. The oxygen and the pure water are subjected to gas-liquid separation in the pure water tank 1, the air from which dust is removed by the air filter 16 enters the pure water tank 1, and the air dilutes the oxygen and the leaked hydrogen and is discharged by the fan 141. At this time, the pure water in the pure water tank 1 is contaminated with air, and the resistivity of the pure water is less than 1 M.OMEGA.cm, so that the requirement of the electrolytic bath for the quality of the electrolyzed water cannot be satisfied.
4. And when the liquid level in the pure water tank 1 reaches a first middle liquid point, the external circulating pump 2 is started, pure water in the pure water tank 1 passes through the external circulating pump 2 and the first filter 71 and then enters the heat exchanger 3 for heat exchange and temperature reduction, and then enters the first polishing mixed bed resin tank 41 and the first precision filter 42 of the external filtering device 4 for purification and filtration, and the external filtering device 4 can increase the resistivity of the pure water from less than 1M omega cm to more than 5M omega cm.
5. The pure water filtered by the external filtering device 4 enters the internal circulation cache water tank 51 of the internal circulation filtering system 5, the internal circulation cache water tank 51 is a closed water tank, is not in contact with air and is not polluted, and the resistivity of the pure water can be ensured to keep a high value. Pure water in the internal circulation cache water tank 51 is divided into two paths after passing through an internal circulation pump 52, one path enters the differential pressure type PEM electrolytic tank 6 to produce hydrogen, the other path enters the second polishing mixed bed resin tank 53 and the second precision filter 54 to be purified and filtered for the second time, and the resistivity of the pure water after being processed by the second polishing mixed bed resin tank 53 and the second precision filter 54 is larger than 18M omega cm. The pure water treated by the second polishing mixed bed resin tank 53 and the second precision filter 54 enters the internal circulation buffer water tank 51 again to form a closed loop, and the internal circulation purifies the pure water again.
By the double purification measures, it can be ensured that the resistivity of the pure water in the internal circulation buffer water tank 51 (i.e. after entering the electrolytic cell) is always kept higher than 10M Ω · cm.
Meanwhile, the flow rate set by the external circulating pump 2 is similar to the flow rate of pure water entering the differential pressure type PEM electrolytic tank 6 by the internal circulating pump 52, so that the flow rate of the system can be kept stable as much as possible, and the frequent fluctuation of the flow rate of the pure water in the system is avoided.
The pure water electrolysis hydrogen production system provided by the embodiment of the invention aims at three main reasons which cause the resistivity reduction of pure water: the problems of resistivity reduction and water supply pressure fluctuation are solved by adopting measures of a double-circulation purification pipeline and double water tanks. Through setting up heat exchanger 3, utilize heat exchanger 3 to reduce the temperature of pure water, make the temperature of pure water satisfy the temperature of intaking of differential PEM electrolysis trough 6 to solve because of the pure water temperature risees and lead to the problem that the pure water resistivity descends. By arranging the external filtering device 4, the internal circulation filtering system 5 and other multi-stage filtering equipment, the catalyst and air pollutants falling off from the surface layer of the membrane electrode can be effectively filtered, so that the problem of pure water resistivity reduction caused by the falling off of the catalyst on the surface layer of the membrane electrode and external air pollution is solved; simultaneously, this pure water electrolysis hydrogen manufacturing system is through setting up two water tanks (pure water tank 1+ inner loop buffer memory water tank 51), and inner loop buffer memory water tank 51 is for sealing the water tank, can solve the problem that the pure water gets into the preceding and air contact of differential type PEM electrolysis trough 6 and reduce resistivity, inner loop buffer memory water tank 51 can also balance the water pressure and the flow that get into the preceding pure water of differential type PEM electrolysis trough 6 simultaneously, the electrolysis trough hydrogen production efficiency that the water pressure fluctuation of avoiding the pure water to directly get into differential type PEM electrolysis trough 6 behind the clarifier caused descends. Moreover, the water quality of the pure water can be improved to a higher level through the circulating filtration of the internal circulating filtration system 5, so that the hydrogen production efficiency is further improved.
Simultaneously, through controlling the liquid level height of pure water in pure water tank 1 and the inner loop buffer memory water tank 51, can further stably get into water pressure and the flow of pure water before the differential PEM electrolysis trough 6, prolong the life of electrolysis trough, promote hydrogen production efficiency for hydrogen production purity can keep being greater than 99.999%, and solve the problem that pure water discharges the waste.
The pure water electrolysis hydrogen production system can reduce the problem of low pure water resistivity caused by external air pollution, temperature rise, membrane electrode surface catalyst falling off and the like, thereby prolonging the service life of the differential pressure type PEM electrolytic cell 6 and improving the hydrogen production efficiency; and the frequent discharge of the pure water can be avoided, and the waste of the pure water is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A pure water electrolysis hydrogen production system is characterized by comprising a pure water tank (1), an external circulating pump (2), a heat exchanger (3), an external filtering device (4), an internal circulating filtering system (5) and a differential pressure type PEM electrolytic tank (6);
the outlet of the pure water tank (1) is communicated with the inlet of the external circulating pump (2), and the outlet of the external circulating pump (2) is communicated with the inlet of the heat exchanger (3); the external filtering device (4) comprises a first polishing mixed bed resin tank (41) and a first precision filter (42), the outlet of the heat exchanger (3) is communicated with the inlet of the first polishing mixed bed resin tank (41), the outlet of the first polishing mixed bed resin tank (41) is communicated with the inlet of the first precision filter (42), the outlet of the first precision filter (42) is communicated with the inlet of the internal circulation filtering system (5), the outlet of the internal circulation filtering system (5) is communicated with the pure water inlet of the differential pressure type PEM electrolytic tank (6), and the circulating water outlet of the differential pressure type PEM electrolytic tank (6) is communicated with the inlet of the pure water tank (1);
the internal circulation filtering system (5) comprises an internal circulation cache water tank (51), an internal circulation pump (52), a second polishing mixed bed resin tank (53) and a second precision filter (54), wherein an outlet of the internal circulation cache water tank (51) is communicated with an inlet of the internal circulation pump (52), an outlet of the internal circulation pump (52) is divided into two paths, one path of outlet is communicated with a pure water inlet of the pressure difference type PEM electrolytic tank (6), the other path of outlet is communicated with an inlet of the second polishing mixed bed resin tank (53), an outlet of the second polishing mixed bed resin tank (53) is communicated with an inlet of the second precision filter (54), and an outlet of the second precision filter (54) is communicated with an inlet of the internal circulation cache water tank (51); the outlet of the first precision filter (42) is communicated with the inlet of the internal circulation buffer water tank (51) or the inlet of the second polishing mixed bed resin tank (53).
2. The system for producing hydrogen by electrolyzing pure water according to claim 1, wherein the external filtering device (4) comprises at least two first polished mixed-bed resin tanks (41), wherein the at least two first polished mixed-bed resin tanks (41) are arranged in parallel, the inlets of the at least two first polished mixed-bed resin tanks (41) are connected in parallel and then communicated with the outlet of the heat exchanger (3), and the outlets of the at least two first polished mixed-bed resin tanks (41) are connected in parallel and then communicated with the inlet of the first precision filter (42).
3. The system for producing hydrogen by electrolyzing pure water according to claim 1, wherein the internal circulation filtration system (5) comprises at least two second polished mixed-bed resin tanks (53), wherein the at least two second polished mixed-bed resin tanks (53) are arranged in parallel, the inlets of the at least two second polished mixed-bed resin tanks (53) are connected in parallel and then communicated with the outlet of the internal circulation pump (52), and the outlets of the at least two second polished mixed-bed resin tanks (53) are connected in parallel and then communicated with the inlet of the second precision filter (54).
4. The pure water electrolytic hydrogen production system according to claim 1, wherein the pure water tank (1) is provided with a first resistivity meter (11), and the first resistivity meter (11) is used for detecting the resistivity of pure water in the pure water tank (1); and a second resistivity instrument (511) is arranged on the internal circulation cache water tank (51), and the second resistivity instrument (511) is used for detecting the resistivity of pure water in the internal circulation cache water tank (51).
5. A pure water electrolytic hydrogen production system according to claim 1, further comprising a first filter (71) and a second filter (72), the first filter (71) being disposed on the line between the outlet of the external circulation pump (2) and the inlet of the heat exchanger (3), the second filter (72) being disposed on the line between the outlet of the internal circulation pump (52) and the pure water inlet of the differential pressure PEM electrolyzer (6).
6. The pure water electrolytic hydrogen production system according to claim 1, further comprising a water replenishing pipeline (81), wherein the water replenishing pipeline (81) is communicated with an inlet of the internal circulation cache water tank (51), and a water inlet valve (811) is arranged on the water replenishing pipeline (81).
7. The pure water electrolytic hydrogen production system according to claim 6, further comprising a first water discharge pipeline (82) and a second water discharge pipeline (83), wherein the first water discharge pipeline (82) is communicated with an outlet of the pure water tank (1), the second water discharge pipeline (83) is communicated with an outlet of the internal circulation cache water tank (51), a first water discharge valve (821) is arranged on the first water discharge pipeline (82), and a second water discharge valve (831) is arranged on the second water discharge pipeline (83); a first liquid level meter (12) is arranged on the pure water tank (1), and the first liquid level meter (12) is in signal connection with the external circulating pump (2) and the first drain valve (821) at the same time; and a second liquid level meter (512) is arranged on the internal circulation buffer water tank (51), and the second liquid level meter (512) is simultaneously in signal connection with the internal circulation pump (52), the water inlet valve (811) and the second drain valve (831).
8. The pure water electrolytic hydrogen production system according to claim 7, wherein the first liquid level meter (12) comprises a first low liquid level point, a first medium liquid level point, a first high liquid level point and a first high liquid level point which are arranged on the pure water tank (1) from bottom to top in sequence;
when the liquid level in the pure water tank (1) is lower than the first low liquid level point, the external circulating pump (2) stops running; when the liquid level in the pure water tank (1) is higher than or equal to the first middle liquid level point, the external circulating pump (2) is started;
when the liquid level height in the pure water tank (1) is lower than the first neutral liquid level point, the first drain valve (821) is closed; when the liquid level height in the pure water tank (1) is greater than or equal to the first high liquid level point, the first drain valve (821) is opened;
and when the liquid level in the pure water tank (1) is higher than or equal to the first high liquid level point, the pure water electrolytic hydrogen production system stops working.
9. The system for electrolytic production of hydrogen by pure water according to claim 7, wherein the second liquid level meter (512) comprises a second low liquid level point, a second medium liquid level point, a medium high liquid level point, a second high liquid level point and a second high liquid level point which are arranged on the internal circulation cache water tank (51) from bottom to top in sequence;
when the liquid level in the internal circulation buffer water tank (51) is lower than the second low liquid level point, the internal circulation pump (52) stops running; when the liquid level in the internal circulation buffer water tank (51) is greater than or equal to the second middle liquid level point, the internal circulation pump (52) is started;
when the liquid level in the internal circulation buffer water tank (51) is lower than the second middle liquid level point, the water inlet valve (811) is opened; when the liquid level height in the internal circulation buffer water tank (51) is greater than or equal to the middle and high liquid level point, the water inlet valve (811) is closed;
when the liquid level in the internal circulation buffer water tank (51) is lower than the middle and high liquid level point, the second drain valve (831) is closed; when the liquid level in the internal circulation cache water tank (51) is greater than or equal to the second high liquid level point, the second drain valve (831) is opened;
and when the liquid level in the internal circulation cache water tank (51) is more than or equal to the second high liquid level point, the pure water electrolytic hydrogen production system stops working.
10. The system for the electrolytic production of hydrogen by pure water according to claim 1, wherein the pure water tank (1) is provided with a temperature sensor (13), and the temperature sensor (13) is in signal connection with the heat exchanger (3).
11. The pure water electrolytic hydrogen production system according to claim 1, wherein an air filter (16) is arranged on the pure water tank (1), and external air can enter the pure water tank (1) after being filtered by the air filter (16); pure water electrolysis hydrogen manufacturing system still includes exhaust pipe (14), exhaust pipe (14) with the top position intercommunication of pure water tank (1), be equipped with fan (141) on exhaust pipe (14), fan (141) are used for with gas in pure water tank (1) is taken out extremely outside pure water tank (1).
12. The system for hydrogen production by pure water electrolysis according to any one of claims 1-11, further comprising a hydrogen separator (91), a cooler (92) and a hydrogen dryer (93), wherein the hydrogen outlet of the pressure differential PEM electrolyzer (6) is communicated with the inlet of the hydrogen separator (91), the outlet of the hydrogen separator (91) is communicated with the inlet of the cooler (92), and the outlet of the cooler (92) is communicated with the inlet of the hydrogen dryer (93).
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| CN202211538762.8A CN115874195A (en) | 2022-12-02 | 2022-12-02 | Pure water electrolysis hydrogen production system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117756057A (en) * | 2023-11-20 | 2024-03-26 | 北京航宇高科氢能源科技有限公司 | PEM water electrolysis high-pressure water-gas separation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117756057A (en) * | 2023-11-20 | 2024-03-26 | 北京航宇高科氢能源科技有限公司 | PEM water electrolysis high-pressure water-gas separation device |
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