CN114657602A - Water replenishing device and water replenishing method for water electrolysis hydrogen production system - Google Patents
Water replenishing device and water replenishing method for water electrolysis hydrogen production system Download PDFInfo
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- CN114657602A CN114657602A CN202210254113.9A CN202210254113A CN114657602A CN 114657602 A CN114657602 A CN 114657602A CN 202210254113 A CN202210254113 A CN 202210254113A CN 114657602 A CN114657602 A CN 114657602A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 460
- 239000001257 hydrogen Substances 0.000 title claims abstract description 192
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 192
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 183
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 117
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001502 supplementing effect Effects 0.000 claims abstract description 79
- 239000001301 oxygen Substances 0.000 claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 69
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000005086 pumping Methods 0.000 claims abstract description 45
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 20
- 239000013589 supplement Substances 0.000 claims abstract description 17
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 102
- 238000012544 monitoring process Methods 0.000 claims description 25
- 230000009469 supplementation Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000003020 moisturizing effect Effects 0.000 description 16
- 239000002994 raw material Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011160 research Methods 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
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
-
- 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
- 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
Abstract
The invention relates to the technical field of water electrolysis hydrogen production equipment, in particular to a water supplementing device and a water supplementing method for a water electrolysis hydrogen production system, wherein the water supplementing device comprises a water tank, a first valve, a second valve, a third valve, a fourth valve, a pressure stabilizing valve, a water supply pipeline, a pumping device, a water outlet pipeline and at least one water delivery pipeline; the use quantity of the pumps can be effectively saved through a one-to-many design concept, the equipment cost is saved, meanwhile, the problem that the whole water replenishing device cannot be used due to the fact that a single pump has a problem is effectively avoided due to the design scheme of the pumps which are used and prepared one by one, the pumping loop is provided with the pressure stabilizing valves which are connected in parallel, and when the post-stage water replenishing is abnormal, the normal use of the pumps can be guaranteed. In addition, independent water supplement of the hydrogen separator and the oxygen separator can be effectively realized through logic control of the control system, the risk of hydrogen and oxygen mixing is avoided, and the safety and the stability of the water supplement device and the hydrogen production system are improved.
Description
Technical Field
The invention relates to the technical field of water electrolysis hydrogen production equipment, in particular to a water supplementing device and a water supplementing method for a water electrolysis hydrogen production system.
Background
Hydrogen energy has attracted attention because of its advantages such as no pollution in combustion and high calorific value. The existing technology for preparing hydrogen by electrolyzing water is mature, has relatively simple operation, and is an important means for preparing hydrogen at present and later. Most of water replenishing devices of the existing hydrogen production equipment adopt a one-to-one (1 water replenishing pump corresponds to one set of framework) water replenishing mode, only rely on a control valve and a water pump to replenish water for a hydrogen-oxygen separator of a hydrogen production system (hydrogen production equipment), and easily generate a phenomenon of mixing hydrogen and oxygen, so that safety risk is generated; when a plurality of sets of hydrogen production equipment run, the water replenishing devices of the sets run simultaneously to replenish water, so that the running risk of the equipment is increased, and the use cost of the equipment is increased; how to optimize the water replenishing device and the water replenishing mode becomes the key point of research on the water replenishing device of the current water electrolysis hydrogen production system.
Disclosure of Invention
The invention aims to provide a water replenishing device and a water replenishing method for a water electrolysis hydrogen production system, which solve the defects of single water replenishing pumps and one-to-one single water replenishing of the existing water replenishing devices and the problem of mixing of hydrogen and oxygen.
The invention provides a water replenishing device for a water electrolysis hydrogen production system, which comprises a water supply pipeline, a water outlet pipeline and at least one water conveying pipeline; the water outlet pipeline comprises an input pipeline and an output pipeline which are connected;
at least one water tank is arranged between the water supply pipeline and the input pipeline, and the water tanks are arranged between the water supply pipeline and the input pipeline in parallel; a water inlet of the water tank is connected with a water supply pipeline, and a first valve is arranged between the water inlet and the water supply pipeline;
the water outlet of the water tank is connected with the input pipeline, and a second valve is arranged between the water outlet and the input pipeline; the output pipeline is provided with at least one water supply interface, and the plurality of water conveying pipelines are correspondingly connected with the plurality of water supply interfaces of the output pipeline; the output ends of the water conveying pipelines are respectively connected with the water electrolysis hydrogen production systems for supplementing water to the water electrolysis hydrogen production systems;
the water conveying pipeline comprises a hydrogen side water replenishing pipeline and an oxygen side water replenishing pipeline which are arranged in parallel, a water replenishing outlet of the hydrogen side water replenishing pipeline is provided with a third valve, and the third valve is connected with a hydrogen separator or a hydrogen washer of the water electrolysis hydrogen production system; and a water replenishing outlet of the oxygen side water replenishing pipeline is provided with a fourth valve, and the fourth valve is connected with an oxygen separator or an oxygen washer of the water electrolysis hydrogen production system.
Furthermore, the water supplementing device further comprises a pumping unit, wherein the pumping unit comprises a first pumping loop, and the first pumping loop is arranged on the output pipeline and is positioned at the front end of the water supply interface; the first pumping loop comprises a first ball valve, a first filter, a first water replenishing pump, a first check valve and a second ball valve which are arranged in sequence.
Further, the pumping unit comprises a second pumping circuit; the second pumping loop is connected with the first pumping loop in parallel and comprises a third ball valve, a second filter, a second water replenishing pump, a second check valve and a fourth ball valve which are sequentially arranged.
Further, the water replenishing device further comprises a pressure stabilizing loop, and the pressure stabilizing loop comprises a pressure stabilizing valve; the pressure stabilizing valve is arranged in parallel with the pumping unit and is used for stabilizing the pressure of the first pumping loop and/or the second pumping loop.
Furthermore, a pressure monitoring unit and/or a flow monitoring unit are arranged on the output pipeline between the pumping unit and the water supply interface, the pressure monitoring unit is used for monitoring the pressure of the output pipeline, and the flow monitoring unit is used for detecting the flow of the output pipeline.
Further, the pressure monitoring unit comprises a pressure transmitter and a pressure gauge which are arranged in parallel; the flow monitoring unit includes a flow meter.
Furthermore, each water tank is provided with a liquid level meter which is used for monitoring the liquid level of the water tank; the bottom of the water tank is provided with a sewage outlet.
Furthermore, each water tank is also provided with a fifth valve, and the fifth valve is connected with the first valve in parallel and is positioned between the water supply pipeline and the input pipeline.
The invention also provides a water replenishing method for the water electrolysis hydrogen production system, which comprises the water replenishing device for the water electrolysis hydrogen production system, and comprises the following steps:
setting a water replenishing liquid level threshold value of the hydrogen production system; and acquiring water replenishing liquid level information of each hydrogen production system, and controlling and executing corresponding water replenishing operation according to the water replenishing liquid level information of each hydrogen production system.
Furthermore, setting a water replenishing liquid level threshold value of the hydrogen production systems, acquiring water replenishing liquid level information of each hydrogen production system, and controlling and executing corresponding water replenishing operation according to the water replenishing liquid level information of each hydrogen production system; the method specifically comprises the following steps:
the current water replenishing liquid level information of the hydrogen production systems is larger than a set water replenishing liquid level threshold value, the hydrogen production systems are in a full state, water replenishing is not needed, and at the moment, the third valve and the fourth valve of each water conveying pipeline cannot be opened;
if the current water replenishing liquid level information of one hydrogen production system is smaller than the set water replenishing liquid level threshold value, opening a third valve or a fourth valve of a water conveying pipeline of the hydrogen production system, and replenishing water to the hydrogen side and the oxygen side of the hydrogen production system independently, and replenishing water to the oxygen side after the independent water replenishing of the hydrogen side of the hydrogen production system is finished or replenishing water to the hydrogen side after the independent water replenishing of the oxygen side of the hydrogen production system is finished; judging that the water supplementing liquid level information is increased to a set water supplementing liquid level threshold value when water supplementing is completed;
in the multiple hydrogen production systems, the current water replenishing liquid level information of the multiple hydrogen production systems does not reach the set water replenishing liquid level threshold, water is preferentially replenished to the side with the minimum water replenishing liquid level information,
the side with the minimum water supplementing liquid level information is the hydrogen side of one hydrogen production system, the hydrogen sides of the hydrogen production systems needing water supplementing are supplemented with water at the same time, the third valves corresponding to the water conveying pipelines are opened for water supplementing at the same time, the water supplementing liquid level information is increased to the set water supplementing liquid level threshold, the corresponding third valves are closed until the water supplementing liquid level information of the hydrogen sides of all the hydrogen production systems needing water supplementing is increased to the water supplementing liquid level threshold, and water supplementing at the hydrogen sides is completed;
and if the side with the minimum water supplementing liquid level information is the oxygen side of one hydrogen production system, simultaneously supplementing water to the oxygen sides of the hydrogen production systems needing water supplementing, simultaneously opening fourth valves corresponding to water conveying pipelines to supplement water, raising the water supplementing liquid level information to a set water supplementing liquid level threshold, closing the corresponding fourth valves until the water supplementing liquid level information of the oxygen sides of all the hydrogen production systems needing water supplementing is raised to the water supplementing liquid level threshold, and completing water supplementing on the oxygen sides.
The technical scheme of the invention has the following advantages:
the water replenishing device for the water electrolysis hydrogen production system can effectively save the using number of the pumps and the equipment cost by a one-to-many design concept, and simultaneously effectively avoid the problem that the whole water replenishing device cannot be used due to the problem of a single pump by a one-to-one pump design scheme. In addition, the liquid levels of the hydrogen separator and the oxygen separator are detected and judged through the logic control of the control system, raw material water is supplemented to the washers, and the washers automatically overflow to the separators to complete water supplement and ensure the safe and stable operation of the hydrogen production system to produce hydrogen; in addition, the independent water replenishing of the hydrogen separator and the oxygen separator can be effectively realized through the logic control of the control system, the risk of hydrogen and oxygen mixing is avoided, and the safety and the stability of the operation of the water replenishing device and the hydrogen production system are improved.
The water replenishing method disclosed by the invention realizes independent water replenishing of the hydrogen side and the oxygen side of the hydrogen production system, effectively prevents the hydrogen and oxygen on the hydrogen side and the oxygen side from being mixed in the water replenishing process, simultaneously satisfies the simultaneous independent water replenishing of the hydrogen side and the oxygen side of a plurality of hydrogen production systems, satisfies the separation of hydrogen and oxygen, ensures the safety, and greatly improves the water replenishing efficiency.
Drawings
FIG. 1 is a block diagram of a water replenishing device for a water electrolysis hydrogen production system according to the present invention;
wherein: 1. the device comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a fourth valve, a fifth valve, a sixth valve, a fourth valve, a sixth valve, a fourth valve, a sixth valve, a fourth valve, a sixth valve, a fourth valve, a sixth valve, a fourth valve, a sixth valve, a.
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.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the water replenishing device for a water electrolysis hydrogen production system of the invention comprises a water supply pipeline, a water outlet pipeline and at least one water conveying pipeline; the water outlet pipeline comprises an input pipeline and an output pipeline which are connected;
at least one water tank is arranged between the water supply pipeline and the input pipeline, and the water tanks are arranged between the water supply pipeline and the input pipeline in parallel; a water inlet of the water tank 3 is connected with a water supply pipeline, and a first valve 1 is arranged between the water inlet and the water supply pipeline; each water tank is also provided with a fifth valve 14 which is arranged in parallel with the first valve and is positioned between the water supply pipeline and the input pipeline;
the water outlet of the water tank is connected with the input pipeline, and a second valve 15 is arranged between the water outlet and the input pipeline; the output pipeline is provided with at least one water supply interface, and the plurality of water conveying pipelines are correspondingly connected with the plurality of water supply interfaces of the output pipeline; the output ends of the water conveying pipelines are respectively connected with the water electrolysis hydrogen production systems for supplementing water to the water electrolysis hydrogen production systems;
the water delivery pipeline comprises a hydrogen side water replenishing pipeline and an oxygen side water replenishing pipeline which are arranged in parallel, a water replenishing outlet of the hydrogen side water replenishing pipeline is sequentially provided with a first check valve 11 and a third valve 12, and the third valve is connected with a hydrogen separator or a hydrogen washer of the water electrolysis hydrogen production system; and a water replenishing outlet of the oxygen side water replenishing pipeline is sequentially provided with a first check valve and a fourth valve 13, and the fourth valve is connected with an oxygen separator or an oxygen washer of the water electrolysis hydrogen production system.
The water replenishing device further comprises a pumping unit, wherein the pumping unit comprises a first pumping circuit and a second pumping circuit; the first pumping loop is arranged on the output pipeline and is positioned at the front end of the water supply interface; the first pumping loop comprises a first ball valve 16, a first filter 9, a first water replenishing pump 10, a first check valve 11 and a second ball valve 17 which are arranged in sequence; the second pumping loop is connected with the first pumping loop in parallel and comprises a third ball valve, a second filter, a second water replenishing pump, a second check valve and a fourth ball valve which are sequentially arranged.
The water replenishing device further comprises a pressure stabilizing loop, wherein the pressure stabilizing loop comprises a pressure stabilizing valve 5; the pressure stabilizing valve is arranged in parallel with the pumping unit and is used for stabilizing the pressure of the first pumping loop and/or the second pumping loop.
In this embodiment, the first valve, the third valve and the fourth valve are preferably water replenishing solenoid valves; the second valve 15 is an electromagnetic ball valve, and the fifth valve is preferably a manual ball valve; the first ball valve, the second ball valve, the third ball valve and the fourth ball valve are isolating ball valves, preferably electromagnetic ball valves.
Raw material water enters respective raw material water tanks through water supplementing electromagnetic valves, each raw material water tank is provided with a liquid level detection unit and controls the starting and stopping of the water supplementing electromagnetic valves, a bypass of each water supplementing electromagnetic valve is provided with a manual water supplementing ball valve, each raw material water tank is provided with a sewage discharge outlet and a water outlet, and outlets of the water tanks are combined and then connected with inlets of water supplementing pumps of the pumping devices; the inlet of the water replenishing pump is provided with a blocking ball valve and a filter, so that the water replenishing pump is convenient to overhaul and filter impurities in water, the outlet of the water replenishing pump is provided with a check valve and a blocking ball valve, so that other units of water or gas are prevented from returning to the outlet of the pump, meanwhile, a self-operated pressure stabilizing valve is arranged in parallel in a loop of the water replenishing pump, and when the pressure at the outlet of the pump is too high, the backflow setting of the water replenishing pump is realized by adjusting the pressure stabilizing valve of a bypass; the device of the invention takes the form of a double pump circuit (a first pumping circuit and a second pumping circuit) with one being used and the other being prepared.
And a pressure monitoring unit and/or a flow monitoring unit are arranged on the output pipeline between the pumping unit and the water supply interface, the pressure monitoring unit is used for monitoring the pressure of the output pipeline, and the flow monitoring unit is used for detecting the flow of the output pipeline. Each water tank is provided with a liquid level meter 2, and the liquid level meters are used for monitoring the liquid level of the water tanks; the bottom of the water tank is provided with a sewage draining outlet which is connected with a sewage draining valve 4, and the sewage draining valve is a manual ball valve or an electromagnetic ball valve. Preferably, the pressure monitoring unit comprises a pressure transmitter 6 and a pressure gauge 7 which are arranged in parallel; the flow monitoring unit comprises a flow meter 8.
A flowmeter and a pressure transmitter are arranged on the main pipeline, whether the main pipeline is abnormal or not is judged according to pressure, and a low-flow alarm is set; different hydrogen production systems are respectively connected in a plurality of water conveying pipelines, and a check valve and a pneumatic ball valve are respectively arranged on a hydrogen side water replenishing pipeline and an oxygen side water replenishing pipeline of the hydrogen separator and the oxygen separator to prevent water from flowing back; the water replenishing process preferentially replenishes water to the washer, and the water replenishing at the hydrogen side and the oxygen side is realized in a control logic mode, so that the mixing of hydrogen and oxygen is effectively avoided.
The invention also provides a water replenishing method for the water electrolysis hydrogen production system, which comprises the water replenishing device for the water electrolysis hydrogen production system, and comprises the following steps:
setting a water replenishing liquid level threshold of the hydrogen production systems, acquiring water replenishing liquid level information of each hydrogen production system, and controlling and executing corresponding water replenishing operation according to the water replenishing liquid level information of each hydrogen production system; the method specifically comprises the following steps:
the current water replenishing liquid level information of the hydrogen production systems is larger than a set water replenishing liquid level threshold value, the hydrogen production systems are in a full state, water replenishing is not needed, and at the moment, the third valve and the fourth valve of each water conveying pipeline cannot be opened;
if the current water replenishing liquid level information of one hydrogen production system is smaller than the set water replenishing liquid level threshold value, opening a third valve or a fourth valve of a water conveying pipeline of the hydrogen production system, and replenishing water to the hydrogen side and the oxygen side of the hydrogen production system independently, and replenishing water to the oxygen side after the independent water replenishing of the hydrogen side of the hydrogen production system is finished or replenishing water to the hydrogen side after the independent water replenishing of the oxygen side of the hydrogen production system is finished; judging that the water supplementing liquid level information is increased to a set water supplementing liquid level threshold value when water supplementing is completed;
in the multiple hydrogen production systems, the current water replenishing liquid level information of the multiple hydrogen production systems does not reach the set water replenishing liquid level threshold, water is preferentially replenished to the side with the minimum water replenishing liquid level information,
the side with the minimum water supplementing liquid level information is the hydrogen side of one hydrogen production system, the hydrogen sides of the hydrogen production systems needing water supplementing are supplemented with water at the same time, the third valves corresponding to the water conveying pipelines are opened for water supplementing at the same time, the water supplementing liquid level information is increased to the set water supplementing liquid level threshold, the corresponding third valves are closed until the water supplementing liquid level information of the hydrogen sides of all the hydrogen production systems needing water supplementing is increased to the water supplementing liquid level threshold, and water supplementing at the hydrogen sides is completed;
and the side with the minimum water supplementing liquid level information is the oxygen side of one hydrogen production system, the oxygen sides of the hydrogen production systems needing water supplementation simultaneously supplement water, the fourth valves corresponding to the water conveying pipelines are opened simultaneously to supplement water, the water supplementing liquid level information is increased to the set water supplementing liquid level threshold value, the corresponding fourth valves are closed until the water supplementing liquid level information of the oxygen sides of all the hydrogen production systems needing water supplementation is increased to the water supplementing liquid level threshold value, and the water supplementing of the oxygen sides is completed.
A concrete moisturizing of this scheme is used:
1# to N # raw material water tanks are adopted and configured according to the scale of the hydrogen production system, and a pumping device adopts two pumping loops which are used one by one; the two water replenishing pumps are used for replenishing water for the sets of hydrogen production system equipment (01-i).
4 x 1000 cubic hydrogen production equipment is needed, 4 sets of hydrogen production systems with 1000m3/H are arranged, the working pressure of the hydrogen production systems is 2.0MPa, 2 sets of 10 cubic raw material water tanks are adopted according to the hydrogen demand scale, and according to the chemical reaction formula, 2H2O ═ 2H2 ═ O2 = (electrified); about 1L of water is consumed to produce 1m3 of hydrogen; therefore, the maximum water replenishing amount required by 4 sets of 1000m3/h equipment is 4m3/h, the model selection of the water replenishing pump is not less than 6m3/h,
when a set of separators are independently replenished, taking the size of an actual container as an example, the required quantity of the apparatus from low-liquid-level replenishing water to high-liquid-level replenishing water is about 1m3The maximum effective water replenishing flow is 5m3The water replenishing time is about 1/5-60-12 minutes (calculated according to 10 minutes) because the water replenishing time is the difference of the pump output flow of 6m3/h and the water consumption of the water replenishing process of 1m 3/h.
According to the characteristic curve of the pump, a bypass pressure stabilizing valve DN20 is selected, and the diameter is selected to ensure that the maximum backflow flow can circulate and the minimum flow for the operation of the pump is ensured.
When 4 sets of systems are replenished simultaneously, the requirement of the system is about 3.5m3Maximum water supplement of 2m3The water replenishing time is about 1.75h, and the system can continuously and stably run in the time period.
The time method comprises the following steps:
according to the gas yield proportion of the system, in the water electrolysis process, 2H2O ═ 2H2 ═ O2 × (power on), the yield of hydrogen is twice that of oxygen, the liquid carried out by the gas is considered to be the same (containing diluted alkali liquor and needing to be washed away in a washer), therefore, the water replenishing times of the hydrogen-oxygen separator are calculated according to 2:1 (the water replenishing proportion is not less than the proportion), and the water replenishing time and the water replenishing quantity of each set of equipment are different in consideration of different operation conditions of the equipment; the water replenishment logic is set as follows:
according to the calculation result, when the time for replenishing water once on the hydrogen side and the oxygen side is considered, the single time period is not less than 2 x 3-6 h (when replenishing water simultaneously, the time for replenishing water once is longest, about 1.75h is considered here as 2h, hydrogen is replenished for 2 times simultaneously in 1 period, and oxygen is replenished for 1 time simultaneously); take 24 hours and a day as an example, water is supplemented in a period of 4P +2 hours.
Example (a):
0-6 points are taken as a period, water is supplemented at 0-4 points on the hydrogen side, and water is supplemented at 5-6 points on the oxygen side;
6-12 points are taken as a period, water is supplemented at 7-10 points on the hydrogen side, and water is supplemented at 11-12 points on the oxygen side; and then sequentially increased.
In each time period, independently replenishing water on the hydrogen side and the oxygen side; only water is supplemented to the hydrogen separator or the oxygen separator, and each pneumatic valve is set to be in an interlocking state, so that only one valve is ensured to act. And in addition, water is supplemented from the lowest liquid level by judging the lowest liquid level of the 01-i gas-liquid processors. And the liquid level difference values of different gas-liquid processor units can be set for water supplement.
The times method comprises the following steps:
according to the gas production ratio of the system, the water replenishing times of the hydrogen and oxygen separators are calculated according to the ratio of 2:1, the water replenishing time and the water replenishing quantity of each set of equipment are different in consideration of different operation conditions of the equipment, and the water replenishing logic is set as follows:
each operation unit simultaneously judges the water replenishing requirement, when the ith equipment needs water replenishing, the requirements of the hydrogen and oxygen side of the water replenishing are firstly judged, and the total number of the 2i pneumatic valves in the system is 2.
Preferably, when a single set of equipment needs to be supplemented with water, only one valve (the third valve or the fourth valve corresponding to the set of equipment) is opened, and the other valves are interlocked.
When the set 2 or other sets need water supplement, if the water supplement is consistent, the water supplement at the same side can be started, and the time for judging the water supplement end of the last stage is used.
Example (c): the system totally counts 4 sets of systems, and every set of system moisturizing is according to every 2 times of hydrogen side of moisturizing after, and oxygen side moisturizing is 1 time, and when only single set of system moisturizing, 1# equipment moisturizing is accomplished the back, judges minimum liquid level moisturizing device i # through the liquid level and starts, and every set of system counts alone simultaneously and judges the direction of moisturizing.
Example (c): the system totally amounts to 4 sets of systems, and every set of system moisturizing is according to every 2 times the hydrogen side after, and oxygen side moisturizing is 1 time, and during 1# equipment moisturizing hydrogen side, if 2# equipment judges that needs moisturizing hydrogen side, then the moisturizing valve is opened simultaneously, if 2# equipment judges that needs the moisturizing side, then waits for 1# moisturizing to accomplish, judges in proper order like the same, and the minimum liquid level equipment of preferential moisturizing.
Liquid level method:
according to the gas production ratio of the system, the water replenishing times of the hydrogen and oxygen separators are calculated according to the ratio of 2:1, the water replenishing time and the water replenishing quantity of each set of equipment are different in consideration of different operation conditions of the equipment, and the water replenishing logic is set as follows:
and each operation unit simultaneously judges the water supplementing requirement and performs graded water supplementing on the liquid levels of the hydrogen separator and the oxygen separator.
According to calculation, the maximum time of single water replenishing is 1.75h, in order to further improve the safety of the system (avoid too long water replenishing time of a single device to cause too low liquid level), the water replenishing liquid level can be divided into 4 grades (between the low water replenishing liquid level and the high water replenishing liquid level), and when the minimum water replenishing liquid level is judged to be 3/4, the water replenishing pump is started in advance to replenish water.
Preferably, when a plurality of machines simultaneously need water supplement, and when the water supplement sides are consistent, water supplement at the same side can be started;
when the equipment is normally shut down, water is supplemented to the upper limit liquid level in the separator at the same time, and the separator is ensured to be in a safe liquid level state.
The water replenishing method disclosed by the invention realizes independent water replenishing of the hydrogen side and the oxygen side of the hydrogen production system, effectively prevents the hydrogen and oxygen on the hydrogen side and the oxygen side from being mixed in the water replenishing process, simultaneously satisfies the simultaneous independent water replenishing of the hydrogen side and the oxygen side of a plurality of hydrogen production systems, satisfies the separation of hydrogen and oxygen, ensures the safety, and greatly improves the water replenishing efficiency.
The water replenishing device further comprises a controller, the controller comprises a control system, the controller is connected with the valve, the pressure monitoring unit, the flowmeter, the liquid level meter and the water replenishing pump, and the control system is arranged conventionally according to the prior art to control the operation of the whole water replenishing device for the water electrolysis hydrogen production system.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A water replenishing device for a water electrolysis hydrogen production system is characterized by comprising a water supply pipeline, a water outlet pipeline and at least one water conveying pipeline; the water outlet pipeline comprises an input pipeline and an output pipeline which are connected;
at least one water tank is arranged between the water supply pipeline and the input pipeline, and the water tanks are arranged between the water supply pipeline and the input pipeline in parallel; a water inlet of the water tank is connected with a water supply pipeline, and a first valve is arranged between the water inlet and the water supply pipeline;
the water outlet of the water tank is connected with the input pipeline, and a second valve is arranged between the water outlet and the input pipeline; the output pipeline is provided with at least one water supply interface, and the plurality of water conveying pipelines are correspondingly connected with the plurality of water supply interfaces of the output pipeline; the output ends of the water conveying pipelines are respectively connected with the water electrolysis hydrogen production systems for supplementing water to the water electrolysis hydrogen production systems;
the water conveying pipeline comprises a hydrogen side water replenishing pipeline and an oxygen side water replenishing pipeline which are arranged in parallel, a water replenishing outlet of the hydrogen side water replenishing pipeline is provided with a third valve, and the third valve is connected with a hydrogen separator or a hydrogen washer of the water electrolysis hydrogen production system; and a water replenishing outlet of the oxygen side water replenishing pipeline is provided with a fourth valve, and the fourth valve is connected with an oxygen separator or an oxygen washer of the water electrolysis hydrogen production system.
2. The water replenishing device for the water electrolysis hydrogen production system according to claim 1, wherein the water replenishing device comprises a pumping unit, the pumping unit comprises a first pumping loop, and the first pumping loop is arranged on the output pipeline and is positioned at the front end of the water supply interface; the first pumping loop comprises a first ball valve, a first filter, a first water replenishing pump, a first check valve and a second ball valve which are arranged in sequence.
3. The water replenishing device for a water electrolysis hydrogen production system according to claim 2, wherein the pumping unit comprises a second pumping circuit; the second pumping loop is connected with the first pumping loop in parallel and comprises a third ball valve, a second filter, a second water replenishing pump, a second check valve and a fourth ball valve which are sequentially arranged.
4. The water replenishing device for the water electrolysis hydrogen production system according to claim 3, which comprises a pressure stabilizing loop, wherein the pressure stabilizing loop comprises a pressure stabilizing valve; the pressure stabilizing valve is arranged in parallel with the pumping unit and is used for stabilizing the pressure of the first pumping loop and/or the second pumping loop.
5. The water replenishing device for a water electrolysis hydrogen production system according to claim 4, wherein a pressure monitoring unit and/or a flow monitoring unit is arranged on the output pipeline between the pumping unit and the water supply interface, the pressure monitoring unit is used for monitoring the pressure of the output pipeline, and the flow monitoring unit is used for detecting the flow of the output pipeline.
6. The water replenishing device for the water electrolysis hydrogen production system according to claim 5, wherein the pressure monitoring unit comprises a pressure transmitter and a pressure gauge which are arranged in parallel; the flow monitoring unit includes a flow meter.
7. The water replenishing device for a system for producing hydrogen by water electrolysis according to any one of claims 1 to 6, wherein each water tank is provided with a liquid level meter for monitoring the liquid level of the water tank.
8. The water replenishing device for a system for producing hydrogen by water electrolysis according to claim 7, wherein each water tank is further provided with a fifth valve, the fifth valve is arranged in parallel with the first valve, and the fifth valve is positioned between the water supply pipeline and the input pipeline; the third valve and the fourth valve of the multiple water pipelines are interlocked.
9. A water replenishing method for a water electrolysis hydrogen production system, comprising the water replenishing device for the water electrolysis hydrogen production system as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
setting a water replenishing liquid level threshold value of the hydrogen production system; and acquiring water replenishing liquid level information of each hydrogen production system, and controlling and executing corresponding water replenishing operation according to the water replenishing liquid level information of each hydrogen production system.
10. The water supplementing method of the water supplementing device for the hydrogen production system through water electrolysis according to claim 9, wherein the water supplementing liquid level threshold of the hydrogen production system is set, the water supplementing liquid level information of each hydrogen production system is obtained, and the corresponding water supplementing operation is controlled and executed according to the water supplementing liquid level information of each hydrogen production system; the method specifically comprises the following steps:
the current water replenishing liquid level information of the hydrogen production systems is larger than a set water replenishing liquid level threshold value, the hydrogen production systems are in a full state, water replenishing is not needed, and at the moment, the third valve and the fourth valve of each water conveying pipeline cannot be opened;
if the current water replenishing liquid level information of one hydrogen production system is smaller than the set water replenishing liquid level threshold value, opening a third valve or a fourth valve of a water conveying pipeline of the hydrogen production system, and replenishing water to the hydrogen side and the oxygen side of the hydrogen production system independently, and replenishing water to the oxygen side after the independent water replenishing of the hydrogen side of the hydrogen production system is finished or replenishing water to the hydrogen side after the independent water replenishing of the oxygen side of the hydrogen production system is finished; judging that the water supplementing liquid level information is increased to a set water supplementing liquid level threshold value when water supplementing is completed;
in the multiple hydrogen production systems, the current water replenishing liquid level information of the multiple hydrogen production systems does not reach the set water replenishing liquid level threshold, water is preferentially replenished to the side with the minimum water replenishing liquid level information,
the side with the minimum water supplementing liquid level information is the hydrogen side of one hydrogen production system, the hydrogen sides of the hydrogen production systems needing water supplementing are supplemented with water at the same time, the third valves corresponding to the water conveying pipelines are opened for water supplementing at the same time, the water supplementing liquid level information is increased to the set water supplementing liquid level threshold, the corresponding third valves are closed until the water supplementing liquid level information of the hydrogen sides of all the hydrogen production systems needing water supplementing is increased to the water supplementing liquid level threshold, and water supplementing at the hydrogen sides is completed;
and the side with the minimum water supplementing liquid level information is the oxygen side of one hydrogen production system, the oxygen sides of the hydrogen production systems needing water supplementation simultaneously supplement water, the fourth valves corresponding to the water conveying pipelines are opened simultaneously to supplement water, the water supplementing liquid level information is increased to the set water supplementing liquid level threshold value, the corresponding fourth valves are closed until the water supplementing liquid level information of the oxygen sides of all the hydrogen production systems needing water supplementation is increased to the water supplementing liquid level threshold value, and the water supplementing of the oxygen sides is completed.
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