CN114622219A - Pure water circulation system for hydrogen production device, control method of pure water circulation system and hydrogen production device - Google Patents
Pure water circulation system for hydrogen production device, control method of pure water circulation system and hydrogen production device Download PDFInfo
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- CN114622219A CN114622219A CN202210303508.3A CN202210303508A CN114622219A CN 114622219 A CN114622219 A CN 114622219A CN 202210303508 A CN202210303508 A CN 202210303508A CN 114622219 A CN114622219 A CN 114622219A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 761
- 239000001257 hydrogen Substances 0.000 title claims abstract description 111
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 111
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 142
- 238000000746 purification Methods 0.000 claims abstract description 64
- 239000007789 gas Substances 0.000 claims description 91
- 239000007788 liquid Substances 0.000 claims description 51
- 238000000926 separation method Methods 0.000 claims description 50
- 230000001276 controlling effect Effects 0.000 claims description 44
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 6
- 238000005342 ion exchange Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 description 10
- 239000008213 purified water Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
- C25B15/023—Measuring, analysing or testing during electrolytic production
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
- C25B15/085—Removing impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/04—Non-contaminated water, e.g. for industrial water supply for obtaining ultra-pure water
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- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Metallurgy (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Automation & Control Theory (AREA)
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Abstract
The invention discloses a pure water circulating system for a hydrogen production device, a control method of the pure water circulating system and the hydrogen production device. The pure water circulation system for a hydrogen production plant includes: the system comprises an electrolytic cell, a pure water transmission branch, a pure water purification branch, a pure water transmission main path and a first water quality detector; the pure water transmission branch is used for transmitting unpurified pure water to the pure water transmission main road; the pure water purification branch is used for purifying pure water and conveying the purified pure water to the pure water main transmission path; the pure water transmission main path is used for transmitting the unpurified pure water or the purified pure water to the electrolytic bath; the first water quality detector is used for detecting the water quality of the pure water in the pure water transmission main path. The embodiment of the invention can ensure that the quality of the pure water entering the electrolytic bath reaches the standard, thereby improving the quality of the prepared hydrogen.
Description
Technical Field
The invention relates to the technical field of hydrogen production, in particular to a pure water circulating system for a hydrogen production device, a control method of the pure water circulating system and the hydrogen production device.
Background
The hydrogen energy is used as clean energy and has the characteristics of wide source, high combustion heat value, no pollution, multiple utilization forms and the like. In recent years, the hydrogen energy industry is being supported by the nation with great effort. In the existing industrial hydrogen production methods, the hydrogen production by electrolyzing pure water is more and more concerned due to the advantages of sufficient raw material sources, environmental protection and no pollution. However, the method for producing hydrogen by electrolyzing pure water has strict requirements on pure water circulation, and if the quality of the pure water does not reach the standard, the pure water entering the electrolytic bath contains more impurity electrolytes, such as calcium, magnesium and other related particles. Then, other electrolytes may combine with the hydrogen generated by electrolysis to form other substances, so that the hydrogen product contains more impurities, which affects the quality of the hydrogen. Therefore, the existing pure water electrolysis hydrogen production device is difficult to ensure that the quality of pure water entering the electrolytic bath reaches the standard, and the finally produced hydrogen has poor quality.
Disclosure of Invention
The invention provides a pure water circulating system for a hydrogen production device, a control method of the pure water circulating system and the hydrogen production device, which are used for ensuring that the quality of pure water entering an electrolytic bath reaches the standard, so that the quality of produced hydrogen is improved.
In a first aspect, an embodiment of the present invention provides a pure water circulation system for a hydrogen production apparatus, including: the system comprises an electrolytic cell, a pure water transmission branch, a pure water purification branch, a pure water transmission main path and a first water quality detector;
the pure water transmission branch is used for transmitting the pure water which is not purified to the pure water transmission main road;
the pure water purification branch is used for purifying pure water and conveying the purified pure water to the pure water transmission main path;
the pure water transmission main path is used for transmitting the unpurified pure water or the purified pure water to the electrolytic bath;
the first water quality detector is used for detecting the water quality of the pure water in the pure water transmission main path.
Optionally, the pure water transmission branch comprises a first transmission pipeline and a first regulating valve arranged on the first transmission pipeline;
the pure water purification branch comprises a second transmission pipeline, a water quality purifier and a third transmission pipeline which are connected in sequence; a second regulating valve is arranged on the second transmission pipeline and/or the third transmission pipeline;
the pure water transmission main path comprises a fourth transmission pipeline, a filter and a fifth transmission pipeline which are connected in sequence; the first transmission pipeline and the third transmission pipeline are both connected with the fourth transmission pipeline, and the fifth transmission pipeline is connected with the electrolytic cell; and the first water quality detector is used for detecting the water quality of the pure water in the fifth transmission pipeline.
Optionally, the first water quality detector comprises: a conductivity meter;
the water quality purifier comprises: an ion exchange tank.
Optionally, the pure water circulation system for a hydrogen plant further includes:
the pure water supply module is used for introducing pure water into the pure water supply module;
a water inlet of the separator is connected with a water outlet of the pure water supply module, a water outlet of the separator is connected with the pure water transmission branch and the pure water purification branch, and a gas inlet of the separator is connected with a gas outlet of the electrolytic cell;
and the gas inlet of the gas separation module is connected with the gas outlet of the separator, the gas outlet of the gas separation module is used for discharging target gas, and the water outlet of the gas separation module is connected with the second water inlet of the pure water supply module.
Optionally, the pure water supply module includes: a pure water tank and a booster pump;
the first water inlet of the pure water tank is used as the first water inlet of the pure water supply module, the water outlet of the pure water tank is connected with the water inlet of the booster pump, and the second water inlet of the pure water tank is connected with the water outlet of the gas separation module;
and the water outlet of the booster pump is connected with the water inlet of the separator.
Optionally, a temperature controller is arranged on the pure water tank and used for controlling the temperature of the pure water in the pure water tank.
Optionally, a breather valve is arranged on the pure water tank for adjusting the pressure in the pure water tank.
Optionally, a second water quality detector and a fourth regulating valve are further arranged on a connecting pipeline between the pure water tank and the booster pump; and the second water quality detector is used for detecting the water quality of the pure water output by the pure water tank.
Optionally, the pure water supply module further comprises a water outlet, and a first water outlet pipe is connected to the water outlet of the pure water supply module; the delivery port of separator still is connected with the second drain pipe, first drain pipe with all be provided with the drain valve on the second drain pipe.
Optionally, the pure water circulation system for a hydrogen plant further includes:
a first buffer tank; the first buffer tank is connected between the water outlet of the gas separation module and the second water inlet of the pure water supply module, and is used for conveying the pure water output by the gas separation module to the pure water supply module after the pure water is decompressed;
a second buffer tank; the second buffer tank is connected with the first water drainage pipe and used for releasing the pressure of the pure water output by the first water drainage pipe.
Optionally, the gas separation module comprises: a first cooler and a gas-liquid separator; the gas inlet of the first cooler is connected with the gas outlet of the separator, and the gas outlet of the first cooler is connected with the gas inlet of the gas-liquid separator; and the gas outlet of the gas-liquid separator is used as the gas outlet of the gas separation module, and the water outlet of the gas-liquid separator is used as the water outlet of the gas separation module.
Optionally, a liquid level meter is further arranged in the separator; the liquid level meter is used for detecting the liquid level of the pure water in the separator.
In a second aspect, an embodiment of the present invention further provides a hydrogen production apparatus, including: the pure water circulation system for the hydrogen production apparatus provided by any embodiment of the present invention.
In a third aspect, an embodiment of the present invention further provides a control method for a pure water circulation system for a hydrogen production apparatus, where the control method is executed by a controller, and the control method includes:
acquiring the water quality of the pure water in the pure water transmission main path detected by the first water quality detector;
if the water quality of the pure water in the main pure water transmission path reaches the standard, controlling the conduction of the pure water transmission branch and controlling the closing of the pure water purification branch;
and if the water quality of the pure water in the main pure water transmission path does not reach the standard but does not exceed the upper limit value, controlling the pure water transmission branch to be closed, and controlling the pure water purification branch to be switched on.
Optionally, the method for controlling a pure water circulation system for a hydrogen plant further includes:
and if the water quality of the pure water in the main pure water transmission path exceeds the upper limit value, controlling the pure water circulating system for the hydrogen production device to stop draining.
Optionally, the method for controlling a pure water circulation system for a hydrogen plant further includes:
acquiring the liquid level in the separator detected by the liquid level detector;
if the liquid level in the separator reaches a first liquid level, controlling the pure water supply module to stop supplying pure water into the separator;
if the liquid level in the separator is reduced to a second liquid level, controlling the pure water supply module to supply pure water to the separator; wherein the second level is lower than the first level.
The pure water circulating system for the hydrogen production device provided by the embodiment of the invention is provided with a pure water transmission branch, a pure water purification branch, a pure water transmission main path and a first water quality detector which jointly form a pure water quality detection and self-purification module at the water inlet front end of the electrolytic cell. In the operation process of the pure water circulating system, firstly, the first water quality detector is used for detecting the water quality of the pure water conveyed to the pure water transmission main path, and then the conduction conditions of the pure water transmission branch, the pure water purification branch and the pure water transmission main path are controlled according to the water quality detection result. Specifically, when the quality of the unpurified pure water reaches the standard, the pure water is directly conveyed to the pure water transmission main road by adopting the pure water transmission branch road; when the quality of the purified pure water does not reach the standard, the pure water is firstly purified by the pure water purification branch, and then the purified pure water is conveyed to the pure water transmission main path, so that the quality of the purified pure water reaches the standard and then is conveyed to the electrolytic cell. Therefore, the pure water transmission path can be selected according to the quality of the pure water in the pure water transmission main path by additionally arranging the pure water transmission branch, the pure water purification branch, the pure water transmission main path and the first water quality detector. On one hand, the quality of pure water supplied to the electrolytic cell can be guaranteed to reach the standard, so that the hydrogen production by electrolyzing the pure water is guaranteed to be reliably carried out, and the quality of a hydrogen product is guaranteed; on the other hand, the purified water which reaches the standard without purification is directly conveyed through the purified water transmission branch, so that the purification is not needed, the circulation step can be saved, the power consumption is effectively reduced, and the operation flow is accelerated.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a pure water circulation system for a hydrogen production apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the structure of another pure water circulation system for a hydrogen plant according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a pure water circulation system for a hydrogen plant according to another embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a method for controlling a pure water circulation system for a hydrogen production apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
The embodiment of the invention provides a pure water circulating system for a hydrogen production device. Fig. 1 is a schematic structural diagram of a pure water circulation system for a hydrogen production apparatus according to an embodiment of the present invention. Referring to fig. 1, the pure water circulation system for a hydrogen plant includes: an electrolytic bath 10, a pure water transmission branch 21, a pure water purification branch 22, a pure water transmission main branch 23 and a first water quality detector C1.
The same unpurified pure water, for example, pure water output from a pre-device such as a pure water tank, a booster pump, or a circulation pump, is introduced into the water inlet of the pure water delivery branch 21 and the water inlet of the pure water purification branch 22. The water outlet of the pure water transmission branch 21 and the water outlet of the pure water purification branch 22 are both connected with the water inlet of the pure water transmission main path 23, and the water outlet of the pure water transmission main path 23 is connected with the water inlet of the electrolytic bath 10. The pure water transmission branch 21, the pure water purification branch 22, the pure water transmission main branch 23 and the first water quality detector C1 together form a pure water quality detection and self-purification module at the front end of the water inlet of the electrolytic cell 10. The pure water transmission branch line 21 is used for transmitting the pure water which is not purified to the pure water transmission main line 23; the pure water purification branch path 22 is used for purifying unpurified pure water and delivering the purified pure water to the pure water transmission main path 23; the pure water transfer main path 23 is for supplying unpurified pure water or purified pure water to the electrolytic bath 10; the first water quality detector C1 is used to detect the water quality of the pure water in the pure water transmission main path 23.
The pure water purification branch 22 is a pure water transmission path that can purify pure water without purification, reduce impurities and other electrolytes contained in the pure water, and improve the quality of the pure water. Illustratively, a purifying device capable of separating impurity particles and ions in the pure water from the water is disposed in the pure water purifying branch 22. The first water quality detector C1 is a detector capable of quantitatively or qualitatively detecting the quality level of pure water. The quality of the pure water can be classified into several grades which reach the standard, do not reach the standard but do not exceed the upper limit value and exceed the upper limit value according to the detection standard. Wherein, the pure water with the water quality up to the standard contains the least impurity particles, and the water quality is the best; the pure water with the water quality not reaching the standard but not exceeding the upper limit value has more impurity particles and poorer water quality; pure water with a water quality exceeding the upper limit contains the largest number of impurity particles and the worst water quality. Illustratively, the first water quality detector C1 may be a conductivity meter that analyzes the quality of pure water by detecting the conductivity of pure water. Specifically, the higher the conductivity, the more impurity particles are contained in the purified water, and the poorer the quality of the purified water is.
Illustratively, there are one or more pure water purification branches 22, one of which is exemplarily shown in fig. 1, and when only one pure water purification branch 22 is provided, the pure water purification branch 22 is provided in parallel with the pure water delivery branch 21. The scheme of providing more than one pure water purification branch 22 can be seen in fig. 2, and exemplarily, two pure water purification branches 22 are arranged in parallel with the pure water transmission branch 21.
Illustratively, regulating valves are arranged in the pure water transmission branch 21, the pure water purification branch 22 and the pure water transmission main branch 23, and are used for controlling the connection and disconnection of the pure water transmission pipeline; the regulating valve can be manually controlled by a worker and also can be automatically controlled by a controller.
All devices in the pure water circulating system for the hydrogen production device are uniformly regulated and controlled by a controller in the hydrogen production device, and the controller is a PLC control cabinet, for example. Illustratively, the control process of the pure water circulation system for the hydrogen production apparatus includes:
firstly, the pure water transmission branch 21 is controlled to be switched on, and the pure water purification branch 22 is controlled to be switched off, so that the pure water which is not purified is directly transmitted to the pure water transmission main path 23 through the pure water transmission branch 21; when pure water is transferred to the pure water transfer main path 23, the first water quality detector C1 detects the water quality in the pure water transfer main path 23.
And acquiring the pure water quality detected by the first water quality detector C1. In this case, the detected pure water quality includes at least the following cases, and each possible case and the corresponding control method will be described below.
1. The quality of the pure water reaches the standard, which indicates that the pure water which is not purified meets the working requirement of the electrolytic bath 10. At this time, the pure water delivery branch 21, the pure water purification branch 22 and the main pure water delivery branch 23 can be continuously controlled to be on, so that the pure water which is not purified is directly delivered to the electrolytic cell 10 through the pure water delivery branch 21 and the main pure water delivery branch 23 without turning on the pure water purification branch 22.
2. The quality of the pure water does not meet the standard but does not exceed the upper limit value, indicating that the unpurified pure water does not meet the operational requirements of the electrolytic cell 10, but is still within the range that can be purified by the pure water purification branch 22. At this time, the pure water transport branch 21, the (at least one) pure water purification branch 22, and the main pure water transport branch 23 are controlled to be turned off, so that the raw pure water is purified by the pure water purification branch 22 and then transported to the electrolytic cell 10 by the main pure water transport branch 23. Illustratively, the pure water purification branch may include a purification sub-branch and a return sub-branch arranged in parallel; like this, when purification back pure water quality still not reach the standard, can control the pure water in the pure water transmission main road 23 and flow back to the water inlet that purifies the sub-branch road through the backward flow sub-branch road, purify the pure water once more through purifying the sub-branch road. After the purification for the preset times, the quality of the pure water still does not reach the standard, and the hydrogen production device can be controlled to stop to discharge water.
3. The quality of the pure water exceeds the upper limit, indicating that the unpurified pure water neither meets the operational requirements of the electrolytic cell 10, nor exceeds the range that can be purified by the pure water purification branch 22. At the moment, the hydrogen production device can be directly controlled to stop, and the pure water circulating system is controlled to enter a water discharging stage.
The pure water circulating system for the hydrogen production device provided by the embodiment of the invention is provided with a pure water transmission branch 21, a pure water purification branch 22, a pure water transmission main branch 23 and a first water quality detector C1 which jointly form a pure water quality detection and self-purification module at the water inlet front end of the electrolytic cell 10. In the operation process of the pure water circulation system, firstly, the first water quality detector C1 detects the water quality of the pure water conveyed to the pure water transmission main path 23, and then the conduction conditions of the pure water transmission branch path 21, the pure water purification branch path 22 and the pure water transmission main path 23 are controlled according to the water quality detection result. Specifically, when the quality of the unpurified pure water meets the standard, the pure water is directly conveyed to the pure water main conveying path 23 by the pure water conveying branch path 21; when the quality of the unpurified pure water does not reach the standard, the pure water purification branch 22 is adopted to firstly purify the pure water, and then the purified pure water is conveyed to the pure water transmission main path 23, so that the water quality reaches the standard and then is conveyed to the electrolytic cell 10. Therefore, in the embodiment of the present invention, by adding the pure water transmission branch 21, the pure water purification branch 22, the pure water transmission main path 23, and the first water quality detector C1, the pure water transmission path can be selected according to the quality of the pure water in the pure water transmission main path 23. On one hand, the quality of the pure water supplied to the electrolytic bath 10 can be ensured to reach the standard, thereby ensuring the reliable operation of hydrogen production by electrolyzing the pure water and ensuring the quality of hydrogen products; on the other hand, the purified water which reaches the standard without purification is directly conveyed through the purified water transmission branch 21 without purification, so that the circulation steps can be saved, the power consumption is effectively reduced, and the operation flow is accelerated.
FIG. 2 is a schematic diagram showing the structure of another pure water circulation system for a hydrogen plant according to an embodiment of the present invention. Referring to fig. 2, on the basis of the above-described embodiments, optionally, the pure water delivery branch 21 includes a first delivery pipe 211 and a first regulating valve 212 provided on the first delivery pipe 211. By controlling the on-off state of the first regulating valve 212, it is possible to control whether or not the pure water delivery branch 21 is on. For example, the controller may control the opening and closing of the first regulating valve 212 according to the water quality detected by the first water quality detector C1, and control the opening of the first regulating valve 212 according to the demand for pure water flow, etc., to achieve automatic control of the pure water circulation system. Illustratively, the first regulator valve 212 may be a ball valve.
The pure water purification branch 22 comprises a second transmission pipeline 221, a water quality purifier 223 and a third transmission pipeline 222 which are connected in sequence; second regulating valve 224 is disposed on second transfer pipe 221 and/or third transfer pipe 222. In fig. 2 it is exemplarily shown that both the second 221 and the third 222 transfer line are provided with ball valves. The on-off state and the opening degree of the second regulating valve 224 may also be collectively controlled by the controller, similarly to the first regulating valve 212. Illustratively, the water quality purifier 223 may be an ion exchange tank to block the backward transfer of impurity ions in pure water.
The pure water transmission main path 23 comprises a fourth transmission pipeline 231, a filter 233 and a fifth transmission pipeline 232 which are connected in sequence; the first transmission pipeline 211 and the third transmission pipeline 222 are both connected with a fourth transmission pipeline 231, and a fifth transmission pipeline 232 is connected with the electrolytic cell 10; the first water quality detector C1 is used for detecting the water quality of the pure water in the fifth transmission pipeline 232; the filter 233 is used for filtering the impurity particles in the pure water, and further ensuring that the quality of the pure water delivered to the electrolytic cell 10 reaches the standard. Illustratively, the fifth transport pipeline 232 is further provided with a regulating valve, such as a ball valve, near the electrolytic cell 10 for controlling whether the pure water main transport pipeline 23 is communicated with the electrolytic cell 10; the regulating valve can also be controlled by the controller in a unified manner.
With continued reference to fig. 2, in addition to the above embodiments, the pure water circulation system for a hydrogen plant optionally further includes: a pure water supply module 30, a separator 40, and a gas separation module 50. Wherein, the first water inlet of the pure water supply module 30 is used for introducing the feed pure water to the pure water supply module 30; the water inlet of the separator 40 is connected with the water outlet of the pure water supply module 30, the water outlet of the separator 40 is connected with both the pure water transmission branch 21 and the pure water purification branch 22, and the air inlet of the separator 40 is connected with the air outlet of the electrolytic cell 10. The gas inlet of the gas separation module 50 is connected to the gas outlet of the separator 40, the gas outlet of the gas separation module 50 is used for discharging the target gas, and the water outlet of the gas separation module 50 is connected to the second water inlet of the pure water supply module 30.
For example, the water circulation process in the pure water circulation system can be referred to by arrow marks on the pipeline in fig. 2, and the specific circulation process includes: when the circulation starts, the pure water fed from the battery limits automatically enters the pure water supply module 30 from the first water inlet of the pure water supply module 30; the feed pure water is processed by the pure water supply module 30 and then is delivered from the water outlet of the pure water supply module 30 to the water inlet of the separator 40; pure water is conveyed from a water outlet at the bottom of the separator 40 to the pure water transmission branch 21 and the pure water purification branch 22, and after the detected water quality reaches the standard, the standard pure water is conveyed from the pure water transmission main path 23 to a water inlet of the electrolytic cell 10; the pure water is subjected to electrochemical reaction in the electrolytic bath 10, and the process gas generated by the reaction still contains certain liquid components; the process gas is conveyed to the gas inlet of the separator 40 through the gas outlet of the electrolytic cell 10 and then conveyed to the gas inlet of the gas separation module 50 through the gas outlet of the separator 40; the gas separation module 50 performs gas-liquid separation and other processes on the process gas, and discharges the target gas from the gas outlet of the gas separation module 50, for example, to a gas storage tank, and a small amount of pure water obtained after the process gas is processed is delivered to the second water inlet of the pure water supply module 30 through the water outlet of the gas separation module 50, thereby completing the cycle.
In this embodiment, pure water is first sent to the electrolytic cell 10 through the separator 40, and the process gas generated by the electrolytic cell 10 is first sent to the gas separation module 50 through the separator 40, so that the process gas is first subjected to primary gas-liquid separation in the separator 40, and a small amount of separated pure water is directly returned to the circulation through the separator 40. The gas separated by the separator 40 is subjected to gas-liquid separation again in the gas separation module 50, so that the obtained target gas has lower water content and better quality.
On the basis of the above embodiments, optionally, since hydrogen and oxygen can be obtained after the electrolysis of water in the electrolysis bath 10, the target gas can include hydrogen and oxygen, and the hydrogen and oxygen can be separated and stored and used respectively, so that the maximum utilization of the electrolysis product can be realized. Then, the gas outlet of the separator 40 includes an oxygen-side gas outlet and a hydrogen-side gas outlet; the gas separation module 50 includes: an oxygen side separation branch and a hydrogen side separation branch. Specifically, the air inlet of the oxygen-side separation branch is connected to the oxygen-side air outlet, the air outlet of the oxygen-side separation branch is used for discharging oxygen, and the water outlet of the oxygen-side separation branch is connected to the second water inlet of the pure water supply module 30. The gas inlet of the hydrogen side separation branch is connected with the gas outlet of the hydrogen side, the gas outlet of the hydrogen side separation branch is used for discharging hydrogen, and the water outlet of the hydrogen side separation branch is connected with the second water inlet of the pure water supply module 30. The structures of the oxygen-side separation branch and the hydrogen-side separation branch may be the same, and refer to fig. 3 in particular. It should be noted that fig. 3 only shows an exemplary specific structure of one gas separation branch.
FIG. 3 is a schematic structural view of a pure water circulation system for a hydrogen production plant according to still another embodiment of the present invention. Referring to fig. 3, on the basis of the above embodiments, optionally, the pure water supply module 30 further comprises a water discharge port, and a first water discharge pipe 61 is connected to the water discharge port of the pure water supply module 30; the water outlet of the separator 40 is also connected with a second water discharge pipe 62, and the first water discharge pipe 61 and the second water discharge pipe 62 are both provided with water discharge valves. The controller can control the drain valve to be opened when the first water quality detector C1 detects that the water quality exceeds the upper limit value or the system is shut down, so that the pure water enters the automatic drainage process in a circulating mode, and the pure water circulating process is completed.
Further, the pure water circulation system for a hydrogen plant further includes: a first buffer tank 71 and a second buffer tank 72. The first buffer tank 71 is connected between the water outlet of the gas separation module 50 and the second water inlet of the pure water supply module 30, and is configured to depressurize the pure water output by the gas separation module 50 and then deliver the depressurized pure water to the pure water supply module 30. The second buffer tank 72 is connected to the first drain pipe 62, and is configured to discharge the pure water output by the first drain pipe 62 after being depressurized in the drain process. Since the pure water in the separator 40 is the pure water obtained after the pressure boosting treatment (the pressure can reach 3MPa), in the prior art, in order to ensure the safety of the drainage, the opening degree of the drainage valve is usually very small during the drainage, so the drainage time is long. In the embodiment, the buffer tank is arranged, so that pure water is discharged after being subjected to pressure relief treatment, the opening degree of the drain valve can be increased, the drainage process is accelerated, and the time for stopping the device is saved.
Further, the pure water circulation system for a hydrogen plant may further include a third drain pipe 63 connecting the second buffer tank 72 and the first drain pipe 61. Thus, the pure water discharged from the bottom of the separator 40 is depressurized through the second buffer tank 72 and then merged into the first drain pipe 61 at the bottom of the pure water supply module 30, and it is possible to arrange that the drains of the separator 40 and the pure water supply module 30 are simultaneously opened.
Next, a specific structure that each functional module may have in the pure water circulation system for a hydrogen production apparatus will be described with reference to fig. 3.
With continued reference to fig. 3, on the basis of the above embodiments, optionally, the pure water supply module 30 includes: a purified water tank 31 and a booster pump 32. A first water inlet of the pure water tank 31 is used as a first water inlet of the pure water supply module 30, a water outlet of the pure water tank 31 is connected with a water inlet of the booster pump 32, and a second water inlet of the pure water tank 30 is connected with a water outlet of the gas separation module 50; the drain port of the pure water tank 30 serves as a drain port of the pure water supply module 30. The water outlet of the booster pump 32 is connected to the water inlet of the separator 40.
In addition to the above embodiments, the pure water tank 30 may be provided with a temperature controller 33, and the temperature controller 33 may be used to control the temperature of the pure water in the pure water tank 31. Specifically, the temperature controller 33 controls the temperature of the pure water in the pure water tank 31 to match the optimal working temperature of the electrolytic cell 10, for example, the optimal working temperature of the electrolytic cell 10 is 60 ℃, and then the temperature of the pure water in the pure water tank 31 may be raised to 60 ℃ first, so that the pure water approaches the optimal working temperature of the electrolytic cell 10 when entering the electrolytic cell 10, thereby enabling the electrolytic cell 10 to reach the target working state quickly and reducing the start-up time of the electrolytic cell 10.
On the basis of the above embodiments, optionally, a breather valve 34 is further disposed on the pure water tank 30, and the breather valve 34 is used for adjusting the pressure in the pure water tank 30. Specifically, whether the breather valve 34 is opened or not, the opening degree, the opening time and the like are controlled, so that the pressure in the pure water tank 31 under different working conditions such as water replenishing and draining can be ensured to be constant, the booster pump 23 can work under a stable working condition all the time, the fluctuation of outlet water pressure caused by the adjustment of the booster pump 32 on the inlet water pressure is avoided, the outlet water pressure is kept at the target pressure, the overpressure risk of the system is reduced, and the smooth and safe operation of the hydrogen production process is ensured.
In addition to the above embodiments, optionally, a second water quality detector C2 and a fourth regulating valve 35 are further provided on the connection pipeline between the pure water tank 31 and the booster pump 32; the second water quality detector C2 is used for detecting the quality of the pure water output from the pure water tank 31. When the water quality of the pure water output by the pure water tank 31 does not exceed the upper limit value, the fourth regulating valve 35 can be controlled to be opened, and the booster pump 32 can be controlled to normally work, so that the pure water is conveyed after being boosted; when the quality of the pure water output from the pure water tank 31 exceeds the upper limit value, the fourth regulating valve 35 may be controlled to close and/or the booster pump 32 may be controlled not to operate, the pure water transmission path may be blocked, and the water discharge may be stopped. Like this, provide the source at the pure water and carry out a water quality testing earlier, when source pure water quality of water surpassed the upper limit, directly block its backward transmission, can avoid the unnecessary start-up of follow-up each device in the pure water circulation system, in time carry out the drainage to and in time carry out work such as pollution source investigation of boundary area feeding pure water. Illustratively, the second water quality detector C2 may be a conductivity meter.
On the basis of the above embodiments, optionally, the pure water supply module 30 further includes: a pressure gauge P1 and a safety valve PSV. The pressure detector P1 is used to detect the pressure of the pure water output by the booster pump 32; the safety valve PSV is connected between the water inlet and the water outlet of the booster pump 32 through a pipe. When the pressure of the pure water output by the booster pump 32 exceeds the upper pressure limit value, the connection between the booster pump 32 and the separator 40 can be controlled to be disconnected, and the safety valve PSV is controlled to be opened, so that the pure water flows back to the water inlet of the booster pump 32, and the overpressure protection of the system is realized.
On the basis of the above embodiments, optionally, a liquid level meter is further provided in the separator 40; the liquid level meter is used to detect the level of pure water in the separator 40. The controller may automatically determine whether water needs to be replenished into the separator 40 based on the liquid level in the separator 40. Specifically, when the liquid level in the separator 40 reaches the first liquid level, the pure water supply module 30 is controlled to stop supplying pure water into the separator 40; as the electrolysis reaction proceeds, the liquid level in the separator 40 gradually decreases; when the liquid level in the separator 40 drops to the second liquid level, the pure water supply module 30 is controlled to continuously supply pure water to the separator 40, so that the hydrogen production process is continuously performed, and the interruption of the hydrogen production process due to insufficient supply of pure water is avoided. Wherein the second level is lower than the first level.
With continued reference to fig. 3, in addition to the above embodiments, the pure water circulation system for a hydrogen plant optionally further includes: a temperature detector T, a circulation pump 80 and a second cooler 90. The water inlet of circulating pump 80 is connected with the water outlet of separator 40, the water outlet of circulating pump 80 is connected with the water inlet of second cooler 90, and the water outlet of second cooler 90 is connected with first transmission pipeline 211 and second transmission pipeline 221. Wherein, the number of the circulating pumps 80 can be set according to actual requirements.
Because the electrolysis reaction is continuously exothermic during the process, the temperature of the system is continuously increased, and there may be a safety risk. In this embodiment, the temperature detector T detects the system temperature, for example, as shown in fig. 3, the outlet water temperature of the second cooler 90, or the pure water temperature in the electrolytic bath 10, and when the system temperature exceeds the temperature safety threshold, the controller may control the cooling function of the second cooler 90 to be turned on to cool the pure water. As indicated by the hollow arrows in fig. 3, the cooling water for the second cooler 90 enters from the bottom of the cooler and exits from the top of the cooler. When the system temperature falls below the temperature safety threshold, the cooling function of the second cooler 90 may be controlled to be turned off, so that the second cooler 90 serves only as the pure water flow path. Further, the second cooler 90 may employ a high efficiency coiled tube heat exchanger to rapidly equilibrate the system temperature. For example, a pressure monitor P2 may be further disposed on the connection line between the circulation pump 80 and the second cooler 90, for detecting the pressure of the pure water supplied to the second cooler 90 and controlling the pressure during the circulation of the pure water.
With continued reference to fig. 3, based on the above embodiments, the gas separation module 50 optionally includes: a first cooler 51 and a gas-liquid separator 52; the air inlet of the first cooler 51 is connected with the air outlet of the separator 40, and the air outlet of the first cooler 51 is connected with the air inlet of the gas-liquid separator 52; the gas outlet of the gas-liquid separator 52 serves as the gas outlet of the gas separation module 50, and the water outlet of the gas-liquid separator 52 serves as the water outlet of the gas separation module 50. The controller may control the cooling function of the first cooler 51 to be turned on when necessary. As indicated by the hollow arrows in fig. 3, the cooling water of the first cooler 51 enters from the bottom of the cooler and exits from the top of the cooler.
Taking the pure water circulation system shown in fig. 3 as an example, the circulation flow of the pure water circulation system specifically includes: when the circulation is started, the pure water fed from the battery limits automatically enters the pure water tank 31, and the temperature and the pressure of the pure water tank 31 are controlled in real time through the temperature controller 33 and the breather valve 34. After the water quality is detected by the electric second water quality detector C2 to be not more than the upper limit value, the pressure of the pure water is increased by the booster pump 32, the boosted pure water enters the separator 40, then enters the second cooler 90 from the bottom of the separator 40 through the circulating pump 80 for temperature control; after the water quality is detected to reach the standard by the first water quality detector C1, the pure water enters the electrolytic bath 10. The pure water is subjected to electrochemical reaction in the electrolytic bath 10, the process gas generated by the reaction enters the next link through the separator 40, the first cooler 51 and the gas-liquid separator 52, and a small amount of pure water separated by the gas-liquid separator 52 returns to the pure water tank 31 through the first buffer tank 71, so that the circulation is completed.
When the water quality of the system does not reach the standard but does not exceed the upper limit value, the pure water coming from the second cooler 90 is cut into the pure water purifier 223, so that the pure water can be purified automatically, and the long-term operation of the system is met. When the first water quality detector C1 detects that the water quality exceeds the upper limit value or the system is shut down, the pure water circularly enters the automatic drainage process, the pure water coming out from the bottom of the separator 40 is decompressed through the second buffer tank 52, then the pure water is connected into a drainage line at the bottom of the pure water tank 31, a drainage valve at the bottom of the pure water tank 31 is opened, and the pure water in the separator 40 and the pure water tank 31 can be drained simultaneously.
In summary, the embodiment of the invention provides a pure water circulation system for a hydrogen production device, which can meet the requirements on electrical conductivity and control requirements on parameters such as temperature and flow; the device can realize the self-purification circulation of pure water, the automatic temperature and pressure control of pure water and the on-line water replenishing and draining.
The embodiment of the invention also provides a hydrogen production device, which comprises the pure water circulating system for the hydrogen production device provided by any embodiment of the invention and has corresponding beneficial effects. Wherein the hydrogen production device is a hydrogen production device for electrolyzing pure water, such as a PEM hydrogen production device. The hydrogen plant also illustratively includes equipment for processing (e.g., re-purifying, etc.) and storing the target gases (hydrogen and oxygen) separated by the gas separation module.
The embodiment of the invention also provides a control method of the pure water circulating system for the hydrogen production device, which can be executed by a controller in the hydrogen production device, wherein the controller can be a PLC control cabinet and can uniformly regulate and control all equipment in the hydrogen production device. The control method of the pure water circulating system for the hydrogen production device is used for controlling the pure water circulating system for the hydrogen production device provided by any embodiment of the invention, and has corresponding beneficial effects.
Fig. 4 is a schematic flow chart illustrating a method for controlling a pure water circulation system for a hydrogen production apparatus according to an embodiment of the present invention. Referring to fig. 4, the method for controlling the pure water circulation system for a hydrogen plant includes:
and S110, acquiring the water quality of the pure water in the pure water transmission main path detected by the first water quality detector.
S120, judging whether the water quality of the pure water in the main pure water transmission path reaches the standard or not; if yes, go to S130; if not, go to S140.
And S130, controlling the conduction of the pure water transmission branch and controlling the closing of the pure water purification branch.
Wherein, the pure water transmission branch and the pure water purification branch can be switched on and off by controlling the on-off of the regulating valve on the branch.
S140, judging whether the water quality of the pure water in the main pure water transmission path exceeds an upper limit value; if yes, go to S160; if not, go to S150.
S150, controlling the pure water transmission branch to be closed, and controlling the pure water purification branch to be conducted.
Before the pure water in the main pure water transmission path does not reach the standard, the disconnection between the main pure water transmission path and the electrolytic bath can be always controlled, so that the pure water which does not reach the standard is prevented from being transmitted to the electrolytic bath.
And S160, controlling the pure water circulating system for the hydrogen production device to stop draining.
According to the control method of the pure water circulating system for the hydrogen production device, provided by the embodiment of the invention, the water quality of the pure water conveyed to the pure water transmission main path is detected by the first water quality detector, and then the conduction conditions of the pure water transmission branch, the pure water purification branch and the pure water transmission main path are controlled according to the water quality detection result. According to the embodiment, the pure water transmission path is selected according to the pure water quality in the pure water transmission main path, so that on one hand, the quality of pure water supplied to the electrolytic tank can be guaranteed to reach the standard, the hydrogen production by electrolyzing pure water is guaranteed to be reliably carried out, and the quality of a hydrogen product is guaranteed; on the other hand, the purified water which reaches the standard without purification is directly transmitted through the purified water transmission branch without purification, so that the circulation steps can be saved, the power consumption is effectively reduced, and the operation flow is accelerated.
On the basis of each of the above embodiments, optionally, before the pure water is supplied to the booster pump, the control method further includes: the temperature controller controls the pure water temperature in the pure water tank to match the optimal working temperature of the electrolytic bath. Therefore, the pure water can be close to the optimal working temperature of the electrolytic cell when entering the electrolytic cell, so that the electrolytic cell can quickly reach the target working state, and the starting time of the electrolytic cell is reduced.
On the basis of each of the above embodiments, optionally, before the pure water is supplied to the booster pump, the control method further includes: acquiring the water quality of the pure water output by the pure water tank detected by the second water quality detector; if the water quality of the pure water output by the pure water tank does not exceed the upper limit value, controlling the pipeline between the pure water tank and the booster pump to be conducted, and controlling the booster pump to be started; and if the quality of the pure water output by the pure water tank exceeds the upper limit value, controlling the pipeline between the pure water tank and the booster pump to be not conducted and/or controlling the booster pump to be not started. Therefore, the water quality can be preliminarily detected at the beginning of circulation, and the treatment such as shutdown drainage, feeding pure water inspection and the like can be timely carried out when the water quality exceeds the upper limit.
On the basis of the foregoing embodiments, optionally, during the water inlet and outlet process of the pure water tank, the control method further includes: the pressure in the pure water tank is adjusted to be constant through the breather valve. Specifically, the pressure in the pure water tank is constant under different working conditions such as water replenishing and draining by controlling whether the breather valve is opened or not, and controlling the opening degree, the opening time and the like.
In addition to the above embodiments, the method for controlling a pure water circulation system for a hydrogen plant may further include: acquiring the liquid level in the separator detected by a liquid level detector; if the liquid level in the separator reaches the first liquid level, controlling the pure water supply module to stop supplying pure water into the separator; if the liquid level in the separator is reduced to a second liquid level, controlling a pure water supply module to supply pure water to the separator; wherein the second level is lower than the first level. The embodiment is arranged in such a way, so that automatic water supplement in the pure water circulating system can be realized, and the normal and continuous operation of the hydrogen production process is ensured.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A pure water circulation system for a hydrogen production apparatus, comprising: the system comprises an electrolytic tank, a pure water transmission branch, a pure water purification branch, a pure water transmission main path and a first water quality detector;
the pure water transmission branch is used for transmitting unpurified pure water to the pure water transmission main road;
the pure water purification branch is used for purifying pure water and conveying the purified pure water to the pure water transmission main path;
the pure water transmission main path is used for transmitting the unpurified pure water or the purified pure water to the electrolytic bath;
the first water quality detector is used for detecting the water quality of the pure water in the pure water transmission main path.
2. The pure water circulation system for a hydrogen plant according to claim 1,
the pure water transmission branch comprises a first transmission pipeline and a first regulating valve arranged on the first transmission pipeline;
the pure water purification branch comprises a second transmission pipeline, a water quality purifier and a third transmission pipeline which are connected in sequence; a second regulating valve is arranged on the second transmission pipeline and/or the third transmission pipeline;
the pure water transmission main path comprises a fourth transmission pipeline, a filter and a fifth transmission pipeline which are connected in sequence; the first transmission pipeline and the third transmission pipeline are both connected with the fourth transmission pipeline, and the fifth transmission pipeline is connected with the electrolytic cell; and the first water quality detector is used for detecting the water quality of the pure water in the fifth transmission pipeline.
3. The pure water circulation system for a hydrogen plant according to claim 2, wherein the first water quality detector comprises: a conductivity meter;
the water quality purifier comprises: an ion exchange tank.
4. The pure water circulation system for a hydrogen plant according to claim 1, further comprising:
the pure water supply module is used for introducing pure water into the pure water supply module;
a water inlet of the separator is connected with a water outlet of the pure water supply module, a water outlet of the separator is connected with the pure water transmission branch and the pure water purification branch, and a gas inlet of the separator is connected with a gas outlet of the electrolytic cell;
and the gas inlet of the gas separation module is connected with the gas outlet of the separator, the gas outlet of the gas separation module is used for discharging target gas, and the water outlet of the gas separation module is connected with the second water inlet of the pure water supply module.
5. The pure water circulation system for a hydrogen plant according to claim 4, wherein the pure water supply module comprises: a pure water tank and a booster pump;
the first water inlet of the pure water tank is used as the first water inlet of the pure water providing module, the water outlet of the pure water tank is connected with the water inlet of the booster pump, and the second water inlet of the pure water tank is connected with the water outlet of the gas separation module;
and the water outlet of the booster pump is connected with the water inlet of the separator.
6. The pure water circulation system for a hydrogen production plant according to claim 5, wherein a temperature controller is provided on the pure water tank for controlling the temperature of the pure water in the pure water tank.
7. The pure water circulation system for a hydrogen production plant according to claim 5, wherein a breather valve is provided on the pure water tank for adjusting the pressure in the pure water tank.
8. The pure water circulation system for the hydrogen production device according to claim 5, wherein a second water quality detector and a fourth regulating valve are further arranged on a connecting pipeline between the pure water tank and the booster pump; and the second water quality detector is used for detecting the water quality of the pure water output by the pure water tank.
9. The pure water circulation system for a hydrogen plant according to claim 4, wherein the pure water supply module further comprises a water outlet, and a first water outlet pipe is connected to the water outlet of the pure water supply module; the delivery port of separator still is connected with the second drain pipe, first drain pipe with all be provided with the drain valve on the second drain pipe.
10. The pure water circulation system for a hydrogen plant according to claim 9, further comprising:
a first buffer tank; the first buffer tank is connected between the water outlet of the gas separation module and the second water inlet of the pure water supply module, and is used for conveying the pure water output by the gas separation module to the pure water supply module after the pure water is decompressed;
a second buffer tank; the second buffer tank is connected with the first water drainage pipe and used for releasing the pressure of the pure water output by the first water drainage pipe.
11. The pure water circulation system for a hydrogen plant according to claim 4, wherein the gas separation module comprises: a first cooler and a gas-liquid separator; the gas inlet of the first cooler is connected with the gas outlet of the separator, and the gas outlet of the first cooler is connected with the gas inlet of the gas-liquid separator; and the gas outlet of the gas-liquid separator is used as the gas outlet of the gas separation module, and the water outlet of the gas-liquid separator is used as the water outlet of the gas separation module.
12. The pure water circulation system for a hydrogen plant according to claim 4, wherein a liquid level meter is further provided in the separator; the liquid level meter is used for detecting the liquid level of the pure water in the separator.
13. A hydrogen production apparatus, comprising: a pure water circulation system for a hydrogen plant according to any one of claims 1 to 12.
14. A method for controlling a pure water circulation system for a hydrogen production apparatus, characterized by comprising: the system comprises an electrolytic cell, a pure water transmission branch, a pure water purification branch, a pure water transmission main path and a first water quality detector;
the control method of the pure water circulation system for the hydrogen production plant is executed by a controller, and comprises the following steps:
acquiring the water quality of the pure water in the pure water transmission main path detected by the first water quality detector;
if the water quality of the pure water in the main pure water transmission path reaches the standard, controlling the conduction of the pure water transmission branch and controlling the closing of the pure water purification branch;
and if the water quality of the pure water in the main pure water transmission path does not reach the standard but does not exceed the upper limit value, controlling the pure water transmission branch to be closed, and controlling the pure water purification branch to be switched on.
15. The method for controlling a pure water circulation system for a hydrogen plant according to claim 14, further comprising:
and if the water quality of the pure water in the main pure water transmission path exceeds the upper limit value, controlling the pure water circulating system for the hydrogen production device to stop draining.
16. The method for controlling a pure water circulation system for a hydrogen plant according to claim 14, further comprising: a pure water supply module and a separator; a liquid level detector is arranged in the separator;
the control method of the pure water circulation system for the hydrogen production plant further comprises the following steps:
acquiring the liquid level in the separator detected by the liquid level detector;
if the liquid level in the separator reaches a first liquid level, controlling the pure water supply module to stop supplying pure water into the separator;
if the liquid level in the separator is reduced to a second liquid level, controlling the pure water supply module to supply pure water to the separator; wherein the second level is lower than the first level.
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