CN117144416A - 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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- CN117144416A CN117144416A CN202311351728.4A CN202311351728A CN117144416A CN 117144416 A CN117144416 A CN 117144416A CN 202311351728 A CN202311351728 A CN 202311351728A CN 117144416 A CN117144416 A CN 117144416A
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- oxygen
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 96
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 96
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000001301 oxygen Substances 0.000 title claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 70
- 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 26
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 54
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 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
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010287 polarization Effects 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
- 238000004088 simulation Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
- C25B15/021—Process control or regulation of heating or cooling
-
- 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
- C25B15/083—Separating products
-
- 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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
-
- 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
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/60—Constructional parts of cells
- C25B9/67—Heating or cooling means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses a control system and a control method for the hydrogen content in oxygen in a low-load state of an alkaline water electrolysis hydrogen production system, wherein the control system comprises an electrolytic tank, a hydrogen separator, an oxygen separator, an alkali liquor cooler and an alkali liquor circulating pump; the electrolytic tank is respectively communicated with the hydrogen separator and the oxygen separator, the alkali liquor cooler is communicated with the electrolytic tank through an alkali liquor circulating pump, and the alkali liquor circulating pump is controlled through a PLC control program so as to control the alkali liquor flow. The system controls the circulation quantity of the alkaline liquor of the electrolytic tank to increase along with the reduction of the load of the electrolytic tank along with the reduction of the load, and when the load of the electrolytic tank is reduced to be lower than the low load, the system starts the adjustment of the circulation quantity of the alkaline liquor, so that the change of the circulation quantity of the alkaline liquor is synchronously controlled and adjusted, and the two are tracked and adjusted according to the corresponding proportion relation, so that the hydrogen in oxygen is controlled to operate within an allowable safety range, and when the load of the electrolytic tank is fluctuated, the controlled circulation quantity of the alkaline liquor is tracked to be changed along with the corresponding change along with the up-down 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 4-96vol.%, the technical safety limit for an emergency shutdown of the entire electrolyzer system is 1.5vol.%. 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. In 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 densities, the oxygen content produced is lower, resulting in an intra-industry alkaline water hydrogen production system operating at low loads with hydrogen content in oxygen exceeding the required technical safety limits of 1.5vol.%.
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 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 the lye circulating pump, and the lye circulating pump is controlled through a PLC control program so as to control the flow of lye.
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 is characterized in that when the running load of an electrolytic tank is reduced, the flow of an alkali liquor circulating pump is increased.
Preferably, a low-load operation parameter interval of the electrolytic tank is set, the electrolytic tank enters the low-load parameter interval, and an alkali liquor circulation quantity control system in the electrolytic tank system is started to adjust circulation quantity.
Preferably, the alkali liquor circulation amount of the electrolytic tank system is increased according to the load reduction amount, and when the load of the electrolytic tank is reduced to the minimum, the alkali liquor circulation amount is opened to the maximum.
Preferably, the low-load operation parameter interval of the electrolytic tank is set to 0-50% load.
Preferably, when the running condition of the electrolytic tank enters a preset low-load parameter interval, the control of increasing the flow is realized by the variable frequency control of the alkali liquor circulating pump, and the alkali liquor circulating quantity is tracked and regulated according to the load reduction change.
The invention has the technical effects and advantages that: the system controls the circulation quantity of the alkaline liquor of the electrolytic tank to increase along with the reduction of the load of the electrolytic tank along with the reduction of the load, and when the load of the electrolytic tank is reduced to be lower than the low load, the system starts the adjustment of the circulation quantity of the alkaline liquor, so that the change of the circulation quantity of the alkaline liquor is synchronously controlled and adjusted, and the two are tracked and adjusted according to the corresponding proportion relation, so that the hydrogen in oxygen is controlled to operate within an allowable safety range, and when the load of the electrolytic tank is fluctuated, the controlled circulation quantity of the alkaline liquor is tracked to be changed along with the corresponding change along with the up-down 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 showing the relationship between the circulation amount and the load of the lye 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 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 the lye circulating pump, and the lye circulating pump is controlled through a PLC control program so as to control the flow of lye.
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 of hydrogen in oxygen under low-load operation of an alkaline water electrolysis hydrogen production system sets a low-load operation parameter interval of an electrolytic cell, and the electrolytic cell enters the low-load parameter interval to start an alkali liquor circulation quantity control system in the electrolytic cell system for circulation quantity adjustment.
Preferably, the alkali liquor circulation amount of the solution tank system is increased according to the load reduction amount, and when the load of the electrolytic tank is reduced to the minimum, the alkali liquor circulation amount is opened to the maximum.
Preferably, the low load operation parameter interval of the electrolytic cell is set to 0-50% load.
Preferably, when the running condition of the electrolytic tank enters a preset low-load parameter interval, the control of increasing the flow is realized by the variable frequency control of the alkali liquor circulating pump, and the alkali liquor circulating amount is tracked and regulated according to the load reduction change
Specifically, the low-load operation parameter interval of the electrolytic tank is set with 0-50% of load, and the value of the low-load operation parameter interval is not unique and can be set according to the actual situation of a user.
Specifically, when the running condition of the electrolytic tank enters a preset low-load parameter interval, the control of increasing the flow is realized by the variable frequency control of the alkali liquor circulating pump, and meanwhile, the alkali liquor circulation quantity is tracked and regulated according to the load reduction change.
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 the current gain of the rectifier, the current rising target value and the system pressure, selecting a circulating pump, informing the 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 system load is reduced, and the set value is correspondingly set as an inlet flow SV set value, wherein the set value is not the only set value, the set value can be set according to the actual requirement of a user, the actual flow of the PV value detected by an electromagnetic flowmeter and the set value of the inlet flow SV set value is calculated through PID to obtain the proper 4-20ma analog quantity control alkali liquor circulating pump frequency converter control flow, so that the alkali liquor flow rate and flow rate are regulated, the cell voltage and the gas purity in a regulating tank are achieved, the technical safety threshold of hydrogen oxide is changed due to the change of the gas purity, and the electrolytic reaction area in the electrolytic tank can be stirred to reduce concentration polarization;
and then the variable frequency pump is used for controlling the flow to change according to the load reduction, so that the parameter stability is ensured after the variable working condition is ensured.
At this time, the hydrogen content in the oxygen gradually decreases after rising to the rated value from steady-state fluctuation, and continuously decreases the load to 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, 5% in turn according to the same operation mode after steady-state, so as to complete the final low-load operation index, thereby achieving an adjusted simulation trend graph and facilitating the control of the technical safety limit value of the hydrogen oxide.
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 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 the lye circulating pump, and the lye circulating pump is controlled through a PLC control program so as to control the flow of lye.
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, wherein the flow rate of the lye circulation pump increases when the operation load of the electrolytic cell decreases.
6. The control method of the control system for the hydrogen content in oxygen in the low-load state of the alkaline water electrolysis hydrogen production system according to claim 5, wherein the control method comprises the following steps: setting a low-load operation parameter interval of the electrolytic tank, and starting an alkali liquor circulation quantity control system in the electrolytic tank system to adjust the circulation quantity when the electrolytic tank enters the low-load operation parameter interval.
7. The control method of the control system for the hydrogen content in oxygen in the low-load state of the alkaline water electrolysis hydrogen production system according to claim 5, wherein the control method comprises the following steps: the alkali liquor circulation amount of the electrolytic tank system is increased according to the load reduction amount, and when the load of the electrolytic tank is reduced to the minimum, the alkali liquor circulation amount is opened to the maximum.
8. The control method of the control system for the hydrogen content in oxygen in the low-load state of the alkaline water electrolysis hydrogen production system according to claim 5, wherein the control 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 control method of the control system for the hydrogen content in oxygen in the low-load state of the alkaline water electrolysis hydrogen production system according to claim 5, wherein the control method comprises the following steps: when the running condition of the electrolytic tank enters a preset low-load parameter interval, the control of increasing the flow is realized by the variable frequency control of the alkali liquor circulating pump, and the alkali liquor circulating quantity is tracked and regulated according to the load reduction change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311351728.4A CN117144416A (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 |
|---|---|---|---|
| CN202311351728.4A CN117144416A (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 |
|---|---|
| CN117144416A true CN117144416A (en) | 2023-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311351728.4A Pending CN117144416A (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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| Country | Link |
|---|---|
| CN (1) | CN117144416A (en) |
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2023
- 2023-10-18 CN CN202311351728.4A patent/CN117144416A/en active Pending
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