CN117187878A - System and method for controlling hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system - Google Patents
System and method for controlling hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system Download PDFInfo
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- CN117187878A CN117187878A CN202311351729.9A CN202311351729A CN117187878A CN 117187878 A CN117187878 A CN 117187878A CN 202311351729 A CN202311351729 A CN 202311351729A CN 117187878 A CN117187878 A CN 117187878A
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- oxygen
- hydrogen
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- electrolytic tank
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 97
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 97
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 85
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000001301 oxygen Substances 0.000 title claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003513 alkali Substances 0.000 claims description 32
- 150000002431 hydrogen Chemical class 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 12
- 239000012670 alkaline solution Substances 0.000 abstract description 10
- 230000008859 change Effects 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a system and a method for controlling the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system. The system controls the running temperature of the alkaline solution of the electrolytic tank to drop along with the load drop of the electrolytic tank along with the load drop, when the load of the electrolytic tank drops below the low load, the alkaline solution temperature is synchronously controlled and regulated along with the load drop through the alkaline solution cooler, and the alkaline solution temperature are tracked and regulated according to the corresponding proportion relation so as to ensure that hydrogen in oxygen is controlled to run within an allowable safety range, and when the load of the electrolytic tank fluctuates, the controlled alkaline solution temperature tracks the load to change along with the corresponding change along with the change of the load.
Description
Technical Field
The invention belongs to the technical field of electrolyzed water, and particularly relates to a system and a method for controlling the hydrogen content in oxygen in a low-load state of an alkaline electrolyzed water hydrogen production system.
Background
The gas purity is an important indicator of the electrolysis of alkaline water, and the gas purity of hydrogen produced during operation of the hydrogen production system is typically greater than 99.9vol.% (without additional purification) and the gas purity of oxygen produced is typically required to be greater than 98.5 vol.%. Since the two product gases can form an explosive mixture in the range of about 4-96 vol.%, the technical safety limit for an emergency shutdown of the entire electrolyzer system is 1.5 vol.%. Therefore, the content of hydrogen in the impurity of the product gas, namely oxygen, needs to be lower than the limit value in the operation process of the whole hydrogen production system so as to ensure the continuous operation and production of the hydrogen production system.
During the gas production process of the alkaline water electrolysis hydrogen production system, the purity of the gas increases along with the increase of the current density, however, at lower current density, the content of generated hydrogen is lower, so that the hydrogen content in oxygen of the alkaline water hydrogen production system in industry under low load operation exceeds the required technical safety limit of 1.5 vol.%.
Disclosure of Invention
The invention aims to provide a control method for hydrogen in oxygen under low-load operation of an alkaline water electrolysis hydrogen production system so as to solve the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a control system for the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system comprises an electrolytic tank, a hydrogen separator, an oxygen separator, an alkali liquor cooler, a temperature monitor and an alkali liquor circulating pump;
the electrolytic tank is respectively communicated with the hydrogen separator and the oxygen separator, the hydrogen separator and the oxygen separator are both communicated with the lye cooler, the lye cooler is communicated with the electrolytic tank through a lye circulating pump, a lye temperature monitor is arranged at the inlet of the electrolytic tank and is used for monitoring the temperature of lye, the lye temperature monitor is connected to a master controller, and when the master controller controls the electrolytic tank to run under low load, the master controller controls the lye cooler to reduce the lye temperature, so that the temperature of lye of the electrolytic tank also reduces along with the reduction of the load.
Preferably, the alkali liquor circulating pump comprises an alkali liquor circulating pump A or an alkali liquor circulating pump B, and the alkali liquor circulating pump A or the alkali liquor circulating pump B conveys the alkali liquor in the alkali liquor cooler into the electrolytic tank.
Preferably, the hydrogen separator is communicated with a hydrogen comprehensive tower, the hydrogen comprehensive tower is communicated with a hydrogen water cooler, the hydrogen water cooler is communicated with a hydrogen water separator, the hydrogen water separator discharges unqualified hydrogen and qualified hydrogen in two paths, and the hydrogen water separator is communicated with a hydrogen drainer.
Preferably, the oxygen separator is communicated with an oxygen comprehensive tower, the oxygen comprehensive tower is communicated with an oxygen water cooler, the oxygen water cooler is communicated with an oxygen water separator, the oxygen water separator discharges oxygen, and the oxygen water separator is communicated with an oxygen drainer.
A control method of a control system for the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system comprises the step of changing the operation temperature of alkaline liquid in an electrolysis tank according to the operation load change of the electrolysis tank.
Preferably, a low-load operation parameter interval of the electrolytic tank is set, and the electrolytic tank enters the low-load parameter interval to start an operation temperature control system of alkali liquor in the electrolytic tank system for temperature adjustment.
Preferably, the operating temperature of the lye in the electrolytic cell system is reduced in accordance with the operating load of the electrolytic cell to reduce the operating temperature of the lye.
Preferably, the low-load operation parameter interval of the electrolytic tank is set to 0-50% load.
Preferably, the temperature of the lye of the electrolytic tank is controlled by a cooling water system so that the outlet temperature of the electrolytic tank is stabilized within a range required by low load, and the electrolytic tank system can stably operate under the low load condition.
The invention has the technical effects and advantages that: the system controls the running temperature of the alkaline solution of the electrolytic tank to drop along with the load drop of the electrolytic tank along with the load drop, when the load of the electrolytic tank drops below the low load, the alkaline solution temperature is synchronously controlled and regulated along with the load drop through the alkaline solution cooler, and the alkaline solution temperature are tracked and regulated according to the corresponding proportion relation so as to ensure that hydrogen in oxygen is controlled to run within an allowable safety range, and when the load of the electrolytic tank fluctuates, the controlled alkaline solution temperature tracks the load to change along with the corresponding change along with the change of the load.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic diagram of the relationship between temperature and load according to the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings. Aspects of the invention are described in this disclosure with reference to the drawings, in which are shown a number of illustrative embodiments. The embodiments of the present disclosure need not be defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, may be implemented in any of a number of ways, as the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
As shown in FIG. 1, the invention provides a control system for the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system, which comprises an electrolytic tank, a hydrogen separator, an oxygen separator, an alkali liquor cooler, a temperature monitor and an alkali liquor circulating pump;
the electrolytic tank is respectively communicated with the hydrogen separator and the oxygen separator, the hydrogen separator and the oxygen separator are both communicated with the lye cooler, the lye cooler is communicated with the electrolytic tank through a lye circulating pump, a lye temperature monitor is arranged at the inlet of the electrolytic tank and is used for monitoring the temperature of lye, the lye temperature monitor is connected to a master controller, and when the master controller controls the electrolytic tank to run under low load, the master controller controls the lye cooler to reduce the lye temperature, so that the temperature of lye of the electrolytic tank also reduces along with the reduction of the load.
The alkali liquor circulating pump comprises an alkali liquor circulating pump A or an alkali liquor circulating pump B, and the alkali liquor circulating pump A or the alkali liquor circulating pump B conveys the alkali liquor in the alkali liquor cooler into the electrolytic tank.
The hydrogen separator is communicated with a hydrogen comprehensive tower, the hydrogen comprehensive tower is communicated with a hydrogen water cooler, the hydrogen water cooler is communicated with a hydrogen water separator, the hydrogen water separator discharges unqualified hydrogen and qualified hydrogen in two paths, and the hydrogen water separator is communicated with a hydrogen drainer.
The oxygen separator is communicated with the oxygen comprehensive tower, the oxygen comprehensive tower is communicated with the oxygen water cooler, the oxygen water cooler is communicated with the oxygen water separator, the oxygen water separator discharges oxygen, and the oxygen water separator is communicated with the oxygen drainer.
In order to achieve the above object, the present invention provides another technical solution as follows:
a control method for hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system is disclosed, wherein the operation temperature of alkaline liquid in the electrolytic tank system is changed according to the operation load change of the electrolytic tank.
Specifically, a low-load operation parameter interval of the electrolytic tank is set, and the electrolytic tank enters the low-load parameter interval to start an operation temperature control system of alkali liquor in an electrolytic tank system for temperature adjustment.
Specifically, the operating temperature of the lye in the electrolytic tank system is reduced according to the operating load of the electrolytic tank, so that the operating temperature of the lye is reduced.
Specifically, the low-load operation parameter interval of the electrolytic tank is set to 0-50% of load.
Specifically, the temperature of the alkaline liquor of the electrolytic tank is controlled through the cooling water system, so that the outlet temperature of the electrolytic tank is stabilized in a range required by low load, and the electrolytic tank system can stably operate under the condition of low load.
Working principle: the automatic control system adopts a programmable logic controller PLC, the automatic control system is configured by a Siemens 1500 series-1513 CPU master station+ET 200sp slave station, the PLC is a slave station, the whole alkaline water electrolysis hydrogen production system is in an automatic mode, the switching valves on the two sides of hydrogen and oxygen are automatically opened and continuously kept in a emptying state, the regulating valves on the two sides of hydrogen and oxygen, the regulating valve for cooling water, the rectifier, the circulating pump and the water supplementing pump are in an automatic mode, and the regulating valve for alkali liquor inlet is in a manual state with 50 percent opening; setting a rectifier current gain, a current rising target value and a system pressure, selecting a circulating pump, informing field personnel of inspection, pressing a key start button if no problem exists, and repeating the steps if the problem exists;
when the whole set of system reaches set values according to set parameters, namely pressure, temperature, flow and liquid level, hydrogen in oxygen and oxygen in hydrogen are stable, the SV temperature set value of a cooling water regulating valve and the inlet temperature of alkali liquor are set to 40-70 ℃, the numerical range of 40-70 ℃ is not the only value, the temperature range is set according to the actual requirement of a user, the PV temperature feedback value of the inlet temperature of the electrolytic tank and the SV set value are calculated through PID to obtain proper opening of the regulating valve, then the inlet temperature is quickly reduced to the SV set value, then the outlet temperature of the electrolytic tank is also quickly reduced along with the inlet temperature, and then the current target is set to be 50% load;
and the opening of the oxyhydrogen two-side regulating valve is rapidly reduced according to load reduction and gas production reduction, so that the parameter stability after the working condition is changed is ensured.
At this time, the hydrogen content state in the oxygen gradually decreases after rising from steady-state fluctuation to a rated value; step 5: and after the steady state, continuously reducing the load to 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10% and 5% according to the same operation mode in sequence, and completing the final low-load operation index, and finally realizing that the opening of the temperature regulating valve is measured on the premise of ensuring the volume ratio of hydrogen in oxygen under the condition of meeting the safety value, so that the relation trend among the opening of the temperature regulating valve, the temperature and the hydrogen value in oxygen is known, and the safety production can be realized by adjusting the applicability.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. A control system for hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system is characterized in that: comprises an electrolytic tank, a hydrogen separator, an oxygen separator, an alkali liquor cooler, a temperature monitor and an alkali liquor circulating pump;
the electrolytic tank is respectively communicated with the hydrogen separator and the oxygen separator, the hydrogen separator and the oxygen separator are both communicated with the lye cooler, the lye cooler is communicated with the electrolytic tank through a lye circulating pump, a lye temperature monitor is arranged at the inlet of the electrolytic tank and is used for monitoring the temperature of lye, the lye temperature monitor is connected to a master controller, and when the master controller controls the electrolytic tank to run under low load, the master controller controls the lye cooler to reduce the lye temperature, so that the temperature of lye of the electrolytic tank also reduces along with the reduction of the load.
2. The control system for hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system as claimed in claim 1, wherein: the alkali liquor circulating pump comprises an alkali liquor circulating pump A or an alkali liquor circulating pump B, and the alkali liquor circulating pump A or the alkali liquor circulating pump B conveys the alkali liquor in the alkali liquor cooler into the electrolytic tank.
3. The control system for hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system as claimed in claim 1, wherein: the hydrogen separator is communicated with a hydrogen comprehensive tower, the hydrogen comprehensive tower is communicated with a hydrogen water cooler, the hydrogen water cooler is communicated with a hydrogen water separator, the hydrogen water separator discharges unqualified hydrogen and qualified hydrogen in two paths, and the hydrogen water separator is communicated with a hydrogen drainer.
4. The control system for hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system as claimed in claim 1, wherein: the oxygen separator is communicated with the oxygen comprehensive tower, the oxygen comprehensive tower is communicated with the oxygen water cooler, the oxygen water cooler is communicated with the oxygen water separator, the oxygen water separator discharges oxygen, and the oxygen water separator is communicated with the oxygen drainer.
5. A control method of a control system for hydrogen content in oxygen in a low load state of an alkaline water electrolysis hydrogen production system according to any one of claims 1 to 4, characterized by: the operating temperature of the lye in the electrolytic cell varies according to the operating load of the electrolytic cell.
6. The method for controlling the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system according to claim 5, wherein the method comprises the following steps: setting a low-load operation parameter interval of the electrolytic tank, and starting an operation temperature control system of alkali liquor in an electrolytic tank system to perform temperature adjustment when the electrolytic tank enters the low-load operation parameter interval.
7. The method for controlling the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system according to claim 5, wherein the method comprises the following steps: the operation temperature of the alkaline liquor in the electrolytic tank system is reduced according to the operation load of the electrolytic tank, so that the operation temperature of the alkaline liquor is reduced.
8. The method for controlling the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system according to claim 5, wherein the method comprises the following steps: and the low-load operation parameter interval of the electrolytic tank is set with 0-50% of load.
9. The method for controlling the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system according to claim 5, wherein the method comprises the following steps: the temperature of the alkaline liquor of the electrolytic tank is controlled by the cooling water system, so that the outlet temperature of the electrolytic tank is stabilized in a range required by low load, and the electrolytic tank system can stably operate under the condition of low load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311351729.9A CN117187878A (en) | 2023-10-18 | 2023-10-18 | System and method for controlling hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311351729.9A CN117187878A (en) | 2023-10-18 | 2023-10-18 | System and method for controlling hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system |
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| Publication Number | Publication Date |
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| CN117187878A true CN117187878A (en) | 2023-12-08 |
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| CN202311351729.9A Pending CN117187878A (en) | 2023-10-18 | 2023-10-18 | System and method for controlling hydrogen content in oxygen in low-load state of alkaline water electrolysis hydrogen production system |
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| CN (1) | CN117187878A (en) |
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- 2023-10-18 CN CN202311351729.9A patent/CN117187878A/en active Pending
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