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CN119061438A - Method and device for preparing hydrogen - Google Patents

Method and device for preparing hydrogen Download PDF

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Publication number
CN119061438A
CN119061438A CN202310627714.4A CN202310627714A CN119061438A CN 119061438 A CN119061438 A CN 119061438A CN 202310627714 A CN202310627714 A CN 202310627714A CN 119061438 A CN119061438 A CN 119061438A
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China
Prior art keywords
alkali liquor
flow
sample
hydrogen
lye
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CN202310627714.4A
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Chinese (zh)
Inventor
陈园园
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Xi'an Longji Hydrogen Energy Technology Co ltd
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Xi'an Longji Hydrogen Energy Technology Co ltd
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Priority to CN202310627714.4A priority Critical patent/CN119061438A/en
Publication of CN119061438A publication Critical patent/CN119061438A/en
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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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

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  • 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)
  • Analytical Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The present disclosure relates to a hydrogen preparation method and apparatus, and relates to the field of hydrogen preparation, applied to a hydrogen production system, the hydrogen production system includes: the device comprises an electrolytic tank, a hydrogen side alkali liquor conveying device and an oxygen side alkali liquor conveying device, wherein two ends of the hydrogen side alkali liquor conveying device are respectively connected with an input end and an output end of the electrolytic tank, and two ends of the oxygen side alkali liquor conveying device are respectively connected with the input end and the output end of the electrolytic tank. The method comprises the steps of determining a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow. The hydrogen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and the oxygen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate. And controlling the electrolytic tank to electrolyze the alkali liquor and output hydrogen and oxygen. The device can flexibly control the flow rate of alkali liquor conveyed by the alkali liquor conveying device on the hydrogen side and the oxygen side, and can improve the concentration of hydrogen and oxygen obtained by electrolysis.

Description

Hydrogen production method and device
Technical Field
The present disclosure relates to the field of hydrogen production, and in particular, to a method and apparatus for producing hydrogen.
Background
The hydrogen preparation method for producing hydrogen by water electrolysis has no pollution in the production process, and the produced hydrogen has high purity, so the method has become one of important production ways for producing hydrogen industrially. The working principle of the water electrolysis hydrogen production is that after the electrolysis cell of the electrolytic tank is charged with direct current, water in the electrolysis cell is decomposed, hydrogen is separated out from the cathode, and oxygen is separated out from the anode. The concentration of hydrogen and oxygen is one of important parameters of an electrolytic cell, a single pipeline is adopted to convey alkaline solution in the current production process of water electrolysis hydrogen production, researches on the concentration of hydrogen and oxygen are mainly focused on the directions of membrane materials, current density, electrolytic cell structure and the like, and the improvement effect on the concentration of hydrogen and oxygen is limited.
Disclosure of Invention
The purpose of the present disclosure is to provide a method and apparatus for producing hydrogen gas for increasing the concentration of hydrogen produced by water electrolysis.
According to a first aspect of an embodiment of the present disclosure, there is provided a method for preparing hydrogen, applied to a hydrogen production system, the hydrogen production system including an electrolytic tank, a hydrogen side lye delivery device and an oxygen side lye delivery device, both ends of the hydrogen side lye delivery device being respectively connected to an input end and an output end of the electrolytic tank, both ends of the oxygen side lye delivery device being respectively connected to the input end and the output end of the electrolytic tank, the method including:
Determining a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow;
controlling the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and controlling the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate;
And controlling the electrolytic tank to electrolyze the alkali liquor, and outputting hydrogen and oxygen.
Optionally, the determining the target lye flow according to the preset lye total flow and the preset lye proportion includes:
And distributing the preset alkali liquor total flow according to the preset alkali liquor proportion to obtain the first alkali liquor flow and the second alkali liquor flow, wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset alkali liquor total flow.
Optionally, the hydrogen side alkali liquor conveying device comprises a first alkali liquor circulating pump and a first regulating valve, the oxygen side alkali liquor conveying device comprises a second alkali liquor circulating pump and a second regulating valve, the control of the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and the control of the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate comprise:
Controlling the opening of the first regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at the first alkali liquor flow rate;
and controlling the opening of the second regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank by the second alkali liquor flow rate.
Optionally, the hydrogen side lye delivery device further comprises a first flowmeter, the oxygen side lye delivery device further comprises a second flowmeter, and the method further comprises:
Detecting a first actual flow rate of the alkali liquor in the hydrogen side alkali liquor conveying device through the first flow meter;
Detecting a second actual flow rate of the lye in the oxygen side lye delivery device by the second flow meter;
And sending prompt information under the condition that the first alkali liquor flow is not matched with the first actual flow and/or the second alkali liquor flow is not matched with the second actual flow, wherein the prompt information is used for prompting that the alkali liquor flow of the hydrogen production system is abnormal.
Optionally, the preset total alkali liquor flow is obtained by the following steps:
Sequentially controlling the total alkali liquor flow rate to be a plurality of sample alkali liquor flow rates so as to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor flow rate, wherein the total alkali liquor flow rate is the sum of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device and the alkali liquor flow rate of the oxygen side alkali liquor conveying device;
And determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor.
Optionally, the sample alkali liquor flow comprises a first sample alkali liquor flow and a second sample alkali liquor flow, and the sequentially controlling the total alkali liquor flow to be a plurality of sample alkali liquor flows to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to each sample alkali liquor flow comprises:
Controlling the total alkali liquor flow rate to be the first sample alkali liquor flow rate so as to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to the first sample alkali liquor flow rate;
Controlling the total alkali liquor flow rate to be the second sample alkali liquor flow rate so as to obtain a second sample hydrogen concentration and a second sample oxygen concentration corresponding to the second sample alkali liquor flow rate, wherein the first sample alkali liquor flow rate and the second sample alkali liquor flow rate are different;
And determining the total flow of the preset alkali liquor according to the first sample hydrogen concentration, the first sample oxygen concentration, the second sample hydrogen concentration and the second sample oxygen concentration.
Optionally, the preset lye ratio is determined by:
Sequentially controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to a plurality of sample alkali liquor ratios to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor ratio, wherein the hydrogen side alkali liquor flow is the alkali liquor flow of the hydrogen side alkali liquor conveying device, the oxygen side alkali liquor flow is the alkali liquor flow of the oxygen side alkali liquor conveying device, and the sample alkali liquor ratio is the ratio of the hydrogen side alkali liquor flow to the oxygen side alkali liquor flow;
and determining the preset alkali liquor proportion according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the plurality of sample alkali liquor proportions.
Optionally, the sample lye proportion comprises a first sample lye proportion, a second sample lye proportion and a third sample lye proportion, and the controlling the hydrogen side lye flow and the oxygen side lye flow according to the plurality of sample lye proportions in turn to obtain the sample hydrogen concentration and the sample oxygen concentration corresponding to each sample lye proportion comprises:
Controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the first sample alkali liquor proportion to obtain a third sample hydrogen concentration and a third sample oxygen concentration corresponding to the first sample alkali liquor proportion, wherein the first sample alkali liquor proportion is the proportion of a first hydrogen side alkali liquor flow and a first oxygen side alkali liquor flow, the first hydrogen side alkali liquor flow is the maximum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow is the preset total alkali liquor flow;
controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the second sample alkali liquor proportion to obtain a fourth sample hydrogen concentration and a fourth sample oxygen concentration corresponding to the second sample alkali liquor proportion, wherein the second sample alkali liquor proportion is the proportion of a second hydrogen side alkali liquor flow and a second oxygen side alkali liquor flow, the second hydrogen side alkali liquor flow is the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow is the preset total alkali liquor flow;
And controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the third sample alkali liquor proportion to obtain a fifth sample hydrogen concentration and a fifth sample oxygen concentration corresponding to the third sample alkali liquor proportion, wherein the third sample alkali liquor proportion is the ratio of the third hydrogen side alkali liquor flow to the third oxygen side alkali liquor flow, the third hydrogen side alkali liquor flow is the intermediate value of the maximum alkali liquor flow and the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow is the preset total alkali liquor flow.
According to a second aspect of the embodiments of the present disclosure, there is provided a hydrogen production apparatus applied to a hydrogen production system, the hydrogen production system including an electrolytic tank, a hydrogen side lye delivery device and an oxygen side lye delivery device, both ends of the hydrogen side lye delivery device being respectively connected with an input end and an output end of the electrolytic tank, both ends of the oxygen side lye delivery device being respectively connected with the input end and the output end of the electrolytic tank, the hydrogen production apparatus including:
The determining module is configured to determine a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow;
The first control module is configured to control the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate and control the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate;
and the second control module is configured to control the electrolysis tank to electrolyze the alkali liquor and output hydrogen and oxygen.
Optionally, the determining module is configured to:
And distributing the preset alkali liquor total flow according to the preset alkali liquor proportion to obtain the first alkali liquor flow and the second alkali liquor flow, wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset alkali liquor total flow.
Optionally, the hydrogen side alkali liquor conveying device comprises a first alkali liquor circulating pump and a first regulating valve, the oxygen side alkali liquor conveying device comprises a second alkali liquor circulating pump and a second regulating valve, the control of the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and the control of the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate comprise:
Controlling the opening of the first regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at the first alkali liquor flow rate;
and controlling the opening of the second regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank by the second alkali liquor flow rate.
Optionally, the hydrogen side lye delivery device further comprises a first flowmeter, the oxygen side lye delivery device further comprises a second flowmeter, and the device further comprises:
A first detection module configured to detect a first actual flow rate of the lye in the hydrogen side lye delivery device by the first flow meter;
a second detection module configured to detect a second actual flow rate of the lye in the oxygen side lye delivery device by the second flow meter;
The prompting module is configured to send prompting information when the first alkali liquor flow is not matched with the first actual flow and/or the second alkali liquor flow is not matched with the second actual flow, and the prompting information is used for prompting that the alkali liquor flow of the hydrogen production system is abnormal.
Optionally, the preset total alkali liquor flow is obtained by the following steps:
Sequentially controlling the total alkali liquor flow rate to be a plurality of sample alkali liquor flow rates so as to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor flow rate, wherein the total alkali liquor flow rate is the sum of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device and the alkali liquor flow rate of the oxygen side alkali liquor conveying device;
And determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor.
Optionally, the sample alkali liquor flow comprises a first sample alkali liquor flow and a second sample alkali liquor flow, and the sequentially controlling the total alkali liquor flow to be a plurality of sample alkali liquor flows to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to each sample alkali liquor flow comprises:
Controlling the total alkali liquor flow rate to be the first sample alkali liquor flow rate so as to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to the first sample alkali liquor flow rate;
Controlling the total alkali liquor flow rate to be the second sample alkali liquor flow rate so as to obtain a second sample hydrogen concentration and a second sample oxygen concentration corresponding to the second sample alkali liquor flow rate, wherein the first sample alkali liquor flow rate and the second sample alkali liquor flow rate are different;
And determining the total flow of the preset alkali liquor according to the first sample hydrogen concentration, the first sample oxygen concentration, the second sample hydrogen concentration and the second sample oxygen concentration.
Optionally, the preset lye ratio is determined by:
Sequentially controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to a plurality of sample alkali liquor ratios to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor ratio, wherein the hydrogen side alkali liquor flow is the alkali liquor flow of the hydrogen side alkali liquor conveying device, the oxygen side alkali liquor flow is the alkali liquor flow of the oxygen side alkali liquor conveying device, and the sample alkali liquor ratio is the ratio of the hydrogen side alkali liquor flow to the oxygen side alkali liquor flow;
and determining the preset alkali liquor proportion according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the plurality of sample alkali liquor proportions.
Optionally, the sample lye proportion includes a first sample lye proportion, a second sample lye proportion and a third sample lye proportion, and the controlling the hydrogen side lye flow and the oxygen side lye flow according to the plurality of sample lye proportions in order to obtain the sample hydrogen concentration and the sample oxygen concentration corresponding to each sample lye proportion includes:
Controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the first sample alkali liquor proportion to obtain a third sample hydrogen concentration and a third sample oxygen concentration corresponding to the first sample alkali liquor proportion, wherein the first sample alkali liquor proportion is the proportion of a first hydrogen side alkali liquor flow and a first oxygen side alkali liquor flow, the first hydrogen side alkali liquor flow is the maximum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow is the preset total alkali liquor flow;
controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the second sample alkali liquor proportion to obtain a fourth sample hydrogen concentration and a fourth sample oxygen concentration corresponding to the second sample alkali liquor proportion, wherein the second sample alkali liquor proportion is the proportion of a second hydrogen side alkali liquor flow and a second oxygen side alkali liquor flow, the second hydrogen side alkali liquor flow is the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow is the preset total alkali liquor flow;
And controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the third sample alkali liquor proportion to obtain a fifth sample hydrogen concentration and a fifth sample oxygen concentration corresponding to the third sample alkali liquor proportion, wherein the third sample alkali liquor proportion is the ratio of the third hydrogen side alkali liquor flow to the third oxygen side alkali liquor flow, the third hydrogen side alkali liquor flow is the intermediate value of the maximum alkali liquor flow and the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow is the preset total alkali liquor flow.
Through the technical scheme, the method comprises the steps of firstly determining the first alkali liquor flow and the second alkali liquor flow according to the preset total alkali liquor flow and the preset alkali liquor proportion, then controlling the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow, controlling the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow, and finally controlling the electrolytic tank to electrolyze the alkali liquor and output hydrogen and oxygen. According to the method, the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device are controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow and the second alkali liquor flow respectively according to the preset total alkali liquor flow and the preset alkali liquor proportion, the flow of the alkali liquor conveyed by the hydrogen side alkali liquor conveying device and the flow of the alkali liquor conveyed by the oxygen side alkali liquor conveying device can be flexibly controlled, and the concentration of hydrogen and oxygen obtained by water electrolysis can be improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a hydrogen plant, according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of producing hydrogen gas according to an exemplary embodiment;
FIG. 3 is a schematic diagram of another hydrogen plant shown according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating another method of producing hydrogen gas according to an exemplary embodiment;
FIG. 5 is a flow chart illustrating another method of producing hydrogen gas according to an exemplary embodiment;
FIG. 6 is a schematic diagram of another hydrogen plant shown in accordance with the embodiment of FIG. 5;
FIG. 7 is a flow chart illustrating a method of determining a total flow of a preset lye according to an exemplary embodiment;
FIG. 8 is a flow chart illustrating a method of determining a preset lye ratio according to an exemplary embodiment;
FIG. 9 is a schematic diagram showing a comparison of caustic flow versus oxyhydrogen concentration according to the embodiment of FIG. 8;
FIG. 10 is a schematic diagram showing a comparison trend of total lye flow versus energy consumption according to the embodiment of FIG. 8;
FIG. 11 is a schematic diagram showing the effect of a difference in oxyhydrogen side flow on oxyhydrogen concentration according to the embodiment of FIG. 8;
Fig. 12 is a block diagram showing a hydrogen production apparatus according to an exemplary embodiment;
fig. 13 is a block diagram illustrating another hydrogen production apparatus according to an exemplary embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Before introducing the method and the device for preparing hydrogen shown in the disclosure, an application scenario related to an embodiment of the disclosure is first described. At present, a single pipeline is generally adopted to convey alkali liquor, as shown in fig. 1, after the alkali liquor output by an alkali liquor circulating pump passes through a total flow valve, the alkali liquor is divided into two paths and is respectively conveyed to an electrolytic tank through a hydrogen side alkali liquor valve and an oxygen side alkali liquor valve for electrolysis. Because the operating mode is complicated, pressure exists in the electrolytic tank, the alkali liquor flow of the hydrogen side and the oxygen side is regulated through the hydrogen side alkali liquor valve and the oxygen side alkali liquor valve, the problem of unbalance of pressure on two sides and the problem of turbulence exist, the alkali liquor conveying mode of a single pipeline is caused, and the alkali liquor flow of the hydrogen side and the oxygen side cannot be accurately regulated respectively.
Fig. 2 is a flow chart illustrating a method of producing hydrogen gas according to an exemplary embodiment, as shown in fig. 2, the method including:
step 101, determining a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow.
The hydrogen production system comprises an electrolytic tank, a hydrogen side alkali liquor conveying device and an oxygen side alkali liquor conveying device, wherein two ends of the hydrogen side alkali liquor conveying device are respectively connected with an input end and an output end of the electrolytic tank, two ends of the oxygen side alkali liquor conveying device are respectively connected with the input end and the output end of the electrolytic tank, and alkali liquor can be respectively conveyed to the electrolytic tank through the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device.
Firstly, the preset total alkali liquor flow and the preset alkali liquor proportion with the highest concentration of hydrogen and oxygen obtained by electrolysis can be obtained through experiments in advance. The preset alkali liquor ratio can be understood as the ratio of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device to the alkali liquor flow rate of the oxygen side alkali liquor conveying device. That is, the concentration of the hydrogen and the oxygen obtained by the electrolysis of the alkaline solution in the electrolytic tank can be ensured to be the highest by determining the alkaline solution flow rate of the hydrogen-side alkaline solution conveying device and the alkaline solution flow rate of the oxygen-side alkaline solution conveying device according to the preset total alkaline solution flow rate and the preset alkaline solution proportion. Wherein, the total flow rate of the preset lye can be selected in the range of 260L/h-320L/h, preferably, the total flow rate of the preset lye can be selected in the range of 280L/h-300L/h, further preferably, the total flow rate of the preset lye can be 290L/h, the proportion of the preset lye can be selected in the range of 0.7:1-1:0.7, preferably, the proportion of the preset lye can be selected in the range of 0.9:1-1:0.9, and preferably, the proportion of the preset lye can be 1:1.
In the production process of the electrolyzed water, the target alkali liquor flow including the first alkali liquor flow and the second alkali liquor flow can be obtained according to the preset alkali liquor total flow and the preset alkali liquor proportion. In one embodiment, the preset lye total flow may be distributed according to a preset lye ratio to obtain a first lye flow and a second lye flow. Wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset total alkali liquor flow, and the ratio of the first alkali liquor flow to the second alkali liquor flow is the preset alkali liquor ratio. Taking the preset total alkali liquor flow rate of 290L/h and the preset alkali liquor ratio of 1:1 as an example, the first alkali liquor flow rate of 145L/h and the second alkali liquor flow rate of 145L/h can be obtained.
Step 102, controlling the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and controlling the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate.
Step 103, controlling the electrolytic tank to electrolyze the alkali liquor, and outputting hydrogen and oxygen.
For example, after the first alkali liquor flow rate and the second alkali liquor flow rate are obtained, the hydrogen side alkali liquor conveying device can be controlled to convey alkali liquor to the electrolytic tank through the hydrogen side alkali liquor conveying pipe according to the first alkali liquor flow rate, and the oxygen side alkali liquor conveying device can be controlled to convey alkali liquor to the electrolytic tank through the oxygen side alkali liquor conveying pipe according to the second alkali liquor flow rate. Under the condition that the hydrogen side alkali liquor conveying device conveys alkali liquor according to the first alkali liquor flow rate and the oxygen side alkali liquor conveying device conveys alkali liquor according to the second alkali liquor flow rate, the electrolysis tank is controlled to electrolyze the alkali liquor so as to output hydrogen and oxygen, hydrogen and oxygen with larger concentration can be obtained, and the purity of hydrogen prepared by water electrolysis is improved.
To sum up, according to the disclosure, first alkali liquor flow and second alkali liquor flow are determined according to the preset alkali liquor total flow and the preset alkali liquor proportion, then the hydrogen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow, the oxygen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow, and finally the electrolytic tank is controlled to electrolyze the alkali liquor to output hydrogen and oxygen. According to the method, the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device are controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow and the second alkali liquor flow respectively according to the preset total alkali liquor flow and the preset alkali liquor proportion, the flow of the alkali liquor conveyed by the hydrogen side alkali liquor conveying device and the flow of the alkali liquor conveyed by the oxygen side alkali liquor conveying device can be flexibly controlled, and the concentration of hydrogen and oxygen obtained by water electrolysis can be improved.
Fig. 4 is a flow chart illustrating another method of preparing hydrogen gas according to an exemplary embodiment, and as shown in fig. 4, step 102 may be implemented by:
And 1021, controlling the opening of the first regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at the first alkali liquor flow rate.
Step 1022, controlling the opening of the second regulating valve according to the first alkali liquor flow rate, so that the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank by the second alkali liquor flow rate.
The hydrogen side alkali liquor conveying device can comprise a first alkali liquor circulating pump and a first regulating valve, and the oxygen side alkali liquor conveying device comprises a second alkali liquor circulating pump and a second regulating valve. After the first alkali liquor flow rate and the second alkali liquor flow rate are determined, a first opening corresponding to the first alkali liquor flow rate and a second opening corresponding to the second alkali liquor flow rate can be determined. And then the opening of the first regulating valve is regulated to be a first opening, and the opening of the second regulating valve is regulated to be a second opening, so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at a first alkali liquor flow rate, and the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank at a second alkali liquor flow rate.
Fig. 5 is a flow chart illustrating another method for producing hydrogen gas according to an exemplary embodiment, as shown in fig. 5, the method further comprising:
Step 104, detecting a first actual flow rate of the lye in the hydrogen side lye conveying device through a first flow meter.
Step 105, detecting a second actual flow rate of the lye in the oxygen side lye delivery device by a second flow meter.
And 106, sending out prompt information under the condition that the first alkali liquor flow rate is not matched with the first actual flow rate and/or the second alkali liquor flow rate is not matched with the second actual flow rate.
By way of example, the hydrogen side lye delivery device may further comprise a first flow meter and the oxygen side lye delivery device may further comprise a second flow meter. The first flowmeter may be disposed on an alkali liquor conveying pipe of the hydrogen side alkali liquor conveying device, and the second flowmeter may be disposed on an alkali liquor conveying pipe of the oxygen side alkali liquor conveying device. In the process of conveying alkali liquor to the electrolytic tank by the hydrogen side alkali liquor conveying device and the hydrogen side alkali liquor conveying device, the first actual flow of the alkali liquor in the hydrogen side alkali liquor conveying device can be monitored in real time through the first flowmeter, and the second actual flow of the alkali liquor in the oxygen side alkali liquor conveying device can be monitored in real time through the second flowmeter. And the first actual flow rate and the first alkali liquor flow rate can be matched, and the second alkali liquor flow rate and the second actual flow rate can be matched.
If any one of the three conditions occurs, a prompt message can be sent to prompt the abnormality of the hydrogen production system. The first alkali liquor flow rate is not matched with the first actual flow rate and the second alkali liquor flow rate is not matched with the second actual flow rate, the second alkali liquor flow rate is matched with the first actual flow rate and the second alkali liquor flow rate is not matched with the second actual flow rate, and the third alkali liquor flow rate is not matched with the first actual flow rate and the second alkali liquor flow rate is matched with the second actual flow rate.
It should be noted that, a first flow threshold corresponding to the first actual flow and the first alkali solution flow may be preset, and a second flow threshold corresponding to the second alkali solution flow and the second actual flow may be set. The first lye flow rate may be considered to be mismatched with the first actual flow rate if the difference between the first actual flow rate and the first lye flow rate is greater than a first flow rate threshold, and the first lye flow rate may be considered to be matched with the first actual flow rate if the difference between the first actual flow rate and the first lye flow rate is less than or equal to the first flow rate threshold. Likewise, if the difference between the second actual flow rate and the second lye flow rate is greater than the second flow rate threshold, the second lye flow rate may be considered to be mismatched with the second actual flow rate, and if the difference between the second actual flow rate and the second lye flow rate is less than or equal to the second flow rate threshold, the second lye flow rate may be considered to be matched with the second actual flow rate.
In some embodiments, as shown in FIG. 6, the hydrogen side lye delivery device may include a first lye tank, a first lye circulation pump, a first regulating valve, a first lye delivery tube, a first flowmeter, a hydrogen separator, and the oxygen side lye delivery device may include a second lye tank, a second lye circulation pump, a second regulating valve, a second lye delivery tube, a second flowmeter, an oxygen separator. The first alkali liquor circulating pump can obtain alkali liquor from the first alkali liquor tank and output the alkali liquor, the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank through the first regulating valve, hydrogen liquor output by the electrolytic tank can be separated through the hydrogen separator to obtain hydrogen and alkali liquor, the alkali liquor separated by the hydrogen separator can be continuously conveyed in the first alkali liquor conveying pipe, and the first flowmeter can detect the alkali liquor flow in the hydrogen side alkali liquor conveying device. Likewise, the second alkali liquor circulating pump can obtain alkali liquor from the second alkali liquor tank and output the alkali liquor, the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank through the second regulating valve, oxygen liquor output by the electrolytic tank can be separated through the oxygen separator to obtain oxygen and alkali liquor, the alkali liquor separated by the oxygen separator can be continuously conveyed in the second alkali liquor conveying pipe, and the second flowmeter can detect the alkali liquor flow in the oxygen side alkali liquor conveying device.
FIG. 7 is a flow chart illustrating a method of determining a total flow of a preset lye according to an exemplary embodiment, as shown in FIG. 7, the method may include:
Step 201, sequentially controlling the total alkali liquor flow rate to be a plurality of sample alkali liquor flow rates so as to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor flow rate.
Step 202, determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor.
For example, a plurality of different sample alkali liquor flow rates can be preset as the total alkali liquor flow rate of the hydrogen production system, wherein the total alkali liquor flow rate is the sum of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device and the alkali liquor flow rate of the oxygen side alkali liquor conveying device. And sequentially controlling the total alkali liquor flow to be a plurality of different sample alkali liquor flows through multiple experiments, and detecting the concentrations of hydrogen and oxygen prepared by the electrolytic cell when the total alkali liquor of the hydrogen production system is the flow of each sample alkali liquor, wherein the concentrations are used as the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the sample alkali liquor. And then taking the sample alkali liquor flow corresponding to the experiment with the highest sample hydrogen concentration and the highest sample oxygen concentration as the preset alkali liquor total flow.
In some embodiments, the sample lye flow rates may include a first sample lye flow rate and a second sample lye flow rate. Firstly, the total alkali liquor flow rate can be controlled to be a first sample alkali liquor flow rate so as to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to the first sample alkali liquor flow rate, and then the total alkali liquor flow rate can be controlled to be a second sample alkali liquor flow rate so as to obtain a second sample hydrogen concentration and a second sample oxygen concentration corresponding to the second sample alkali liquor flow rate, wherein the first sample alkali liquor flow rate and the second sample alkali liquor flow rate are different. Furthermore, the sample alkali liquid flow corresponding to the experiment with higher concentration in the first sample hydrogen concentration, the first sample oxygen concentration, the second sample hydrogen concentration and the second sample oxygen concentration can be used as the preset alkali liquid total flow. For example, if the first sample hydrogen concentration is greater than the second sample hydrogen concentration and the first sample oxygen concentration is greater than the second sample oxygen concentration, then the first sample lye flow may be used as the preset lye total flow. The second sample hydrogen concentration is greater than the first sample hydrogen concentration and the second sample oxygen concentration is greater than the first sample oxygen concentration, then the second sample lye flow can be taken as the preset lye total flow.
Taking the first sample alkali liquor flow rate of 510L/h and the second sample alkali liquor flow rate of 290L/h as examples, experiments can be respectively carried out to obtain a first sample hydrogen concentration and a first sample oxygen concentration when the total alkali liquor flow rate is 510L/h, and a second sample hydrogen concentration and a second sample oxygen concentration when the total alkali liquor flow rate is 290L/h.
In the first experiment, a first regulating valve in the hydrogen side alkali liquor conveying device is regulated to enable the flow rate of the hydrogen side alkali liquor to be 283L/h, and a second regulating valve on the oxygen side alkali liquor pipe is regulated to enable the flow rate of the oxygen side alkali liquor to be 227L/h, so that the total flow rate of the alkali liquor is 510L/h. The hydrogen-side lye flow is understood to be the lye flow of the hydrogen-side lye delivery device, and the oxygen-side lye flow is understood to be the lye flow of the oxygen-side lye delivery device. The current density is 3004A/m 2, the cell temperature of the electrolytic cell is 85.0 ℃, the current of the rectifying cabinet is 744A, the hydrogen side pressure is 1.6Mpa, and the electrolytic cell is operated for 48H under the stable working condition. The detection data is recorded in real time, and then the average value of the recorded data is taken as a final result. The experimental result shows that the energy consumption of the system is 4.446KWH/NM 3, the hydrogen concentration is 99.734%, and the oxygen concentration is 99.028%. That is, 510L/h corresponds to a first sample hydrogen concentration of 99.734% and a first sample oxygen concentration of 99.028%.
And in the second experiment, a first regulating valve in the hydrogen side alkali liquor conveying device is regulated to ensure that the flow rate of the hydrogen side alkali liquor is 221L/h, and a second regulating valve on the oxygen side alkali liquor pipe is regulated to ensure that the flow rate of the oxygen side alkali liquor is 69L/h, so that the total flow rate of the alkali liquor is 290L/h. The current density is controlled to be 2999A/m 2, the cell temperature of the electrolytic cell is 85.1 ℃, the current of the rectifying cabinet is 741A, the hydrogen side pressure is 1.6Mpa, and the electrolytic cell operates for 48H under the stable working condition. The detection data is recorded in real time, and then the average value of the recorded data is taken as a final result. The experimental result shows that the energy consumption of the system is 4.449KWH/NM 3, the hydrogen concentration is 99.803%, and the oxygen concentration is 99.103%. That is, 290L/h corresponds to a second sample hydrogen concentration of 99.803% and a second sample oxygen concentration of 99.103%.
The first and second experiments can obtain that the second sample hydrogen concentration 99.803% is larger than the first sample hydrogen concentration 99.734% and the second sample oxygen concentration 99.103% is larger than the first sample oxygen concentration 99.028%, which means that the hydrogen concentration and the oxygen concentration obtained when the total alkali liquor concentration is 290L/h are larger than the hydrogen concentration and the oxygen concentration obtained when the total alkali liquor concentration is 510L/h, so that the flow of the alkali liquor of the second sample in the second experiment can be used as the total flow of the preset alkali liquor.
It should be noted that, in the experimental process, the hydrogen side actual alkali liquor flow of the hydrogen side alkali liquor conveying device can be detected through the first flowmeter, the oxygen side actual alkali liquor flow of the hydrogen side alkali liquor conveying device can be detected through the second flowmeter, and whether the hydrogen side actual alkali liquor flow and the oxygen side actual alkali liquor flow are matched with the preset sample alkali liquor flow or not is determined, so that the abnormal alkali liquor flow is prevented, the alkali liquor flow of the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device is ensured to be accurate, and the reliability and the accuracy of the experiment are improved. And the temperature of the tank, the current density and the current of the rectifying cabinet are controlled within a preset range, so that the influence of other factors on the concentration of hydrogen and oxygen and the energy consumption is avoided, and the reliability and the accuracy of the experiment are improved.
FIG. 8 is a flow chart illustrating a method of determining a preset lye ratio according to an exemplary embodiment, as shown in FIG. 8, the method may include:
Step 301, controlling the flow rate of the hydrogen side alkali liquor and the flow rate of the oxygen side alkali liquor according to the ratios of the plurality of sample alkali liquor in sequence, so as to obtain the sample hydrogen concentration and the sample oxygen concentration corresponding to each ratio of the sample alkali liquor.
Step 302, determining a preset alkali liquor proportion according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the plurality of sample alkali liquor proportions.
For example, a plurality of different sample lye ratios may be preset as ratios of the hydrogen side lye flow and the oxygen side lye flow, and under the condition that the total lye flow remains unchanged, the corresponding hydrogen side lye flow and oxygen side lye flow are determined according to each sample lye ratio. The ratio of the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow is controlled to be a plurality of different sample alkali liquor ratios through multiple experiments, and the concentrations of hydrogen and oxygen prepared by the electrolytic cell are detected when the ratio of the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow is the ratio of each different sample alkali liquor, and are used as the sample hydrogen concentration and the sample oxygen concentration corresponding to the sample alkali liquor ratio. And then determining the preset alkali liquor proportion according to the sample alkali liquor proportion corresponding to the experiment with the highest sample hydrogen concentration and sample oxygen concentration.
In some embodiments, the sample lye ratios may include a first sample lye ratio, a second sample lye ratio, and a third sample lye ratio. Firstly, the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow can be controlled according to the first sample alkali liquor proportion so as to obtain a third sample hydrogen concentration and a third sample oxygen concentration corresponding to the first sample alkali liquor proportion. The first sample alkali liquor proportion is the proportion of first hydrogen side alkali liquor flow and first oxygen side alkali liquor flow, the first hydrogen side alkali liquor flow is the maximum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow is the preset total alkali liquor flow. The maximum lye flow is understood to be the maximum of the lye flow that can be provided by the hydrogen side lye delivery device in case the production needs are fulfilled.
And then controlling the flow of the alkaline liquor on the hydrogen side and the flow of the alkaline liquor on the oxygen side according to the proportion of the alkaline liquor of the second sample so as to obtain the hydrogen concentration and the oxygen concentration of a fourth sample corresponding to the proportion of the alkaline liquor of the second sample. The second sample alkali liquor proportion is the proportion of second hydrogen side alkali liquor flow and second oxygen side alkali liquor flow, the second hydrogen side alkali liquor flow is the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow is the preset total alkali liquor flow. The minimum lye flow is understood to be the minimum of lye flow that the hydrogen side lye delivery device is required to provide in order to meet the production requirements.
Further, the hydrogen side alkali liquor flow rate and the oxygen side alkali liquor flow rate can be controlled according to the third sample alkali liquor proportion, so as to obtain a fifth sample hydrogen concentration and a fifth sample oxygen concentration corresponding to the third sample alkali liquor proportion. The third sample alkali liquor ratio is the ratio of the third hydrogen side alkali liquor flow to the third oxygen side alkali liquor flow, the third hydrogen side alkali liquor flow is the intermediate value of the maximum alkali liquor flow and the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow is the preset total alkali liquor flow.
Taking the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow corresponding to the first sample alkali liquor ratio as 221L/h and 69L/h respectively, the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow corresponding to the second sample alkali liquor ratio as 150L/h and 143L/h respectively, the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow corresponding to the third sample alkali liquor ratio as 190L/h and 98L/h respectively as an example, experiments can be carried out respectively to obtain the corresponding third sample hydrogen concentration and third sample oxygen concentration when the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow are 221L/h and 69L/h respectively, the corresponding fourth sample hydrogen concentration and fourth sample oxygen concentration when the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow are 150L/h and 143L/h respectively, and the corresponding fifth sample hydrogen concentration and fifth sample oxygen concentration when the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow are 190L/h and 98L/h respectively.
When the first hydrogen side alkali liquor flow rate and the first oxygen side alkali liquor flow rate are 221L/h and 69L/h respectively, the corresponding third sample hydrogen concentration and third sample oxygen concentration are shown as the result of experiment two, the third sample hydrogen concentration is equal to the second sample hydrogen concentration 99.803%, and the third sample oxygen concentration is equal to the second sample oxygen concentration 99.103%.
And thirdly, controlling the sum of the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow to be 293L/h (close to the preset total alkali liquor flow of 290L/h), and adjusting the lower limit (namely the minimum alkali liquor flow) of 150L/h for searching the hydrogen side alkali liquor flow, and then adjusting the oxygen side alkali liquor flow to be 143L/h and the flow difference of 7L/h on the two sides of the hydrogen and oxygen. The current density 3001A/m 2 is controlled, the cell temperature of the electrolytic cell is 85.0 ℃, the current of the rectifying cabinet is 741A, the hydrogen side pressure is 1.6Mpa, the system runs under the stable working condition for 48H, the system records detection data in real time, then the average value of the recorded data is taken as a final result, the detection energy consumption is 4.441KWH/NM 3, the hydrogen concentration is 99.837%, and the oxygen concentration is 99.153%. That is, the fourth sample hydrogen concentration was 99.734% and the fourth sample oxygen concentration was 99.153%.
And in the fourth experiment, the sum of the flow rate of the alkaline solution on the hydrogen side and the flow rate of the alkaline solution on the oxygen side is controlled to be 288L/h (close to the total flow rate of the preset alkaline solution of 290L/h), the intermediate value 190L/h of the upper limit (namely the maximum alkaline solution flow rate) and the lower limit (namely the minimum alkaline solution flow rate) of the adjustable hydrogen side alkaline solution flow rate is searched by adjusting, the flow rate of the alkaline solution on the oxygen side is adjusted to be 98L/h, and the flow rate difference on the two sides of the hydrogen and the oxygen is 93L/h. The current density 3001A/m 2 is controlled, the cell temperature of the electrolytic cell is 85.1 ℃, the current of the rectifying cabinet is 742A, the hydrogen side pressure is 1.6Mpa, the system runs 48H under the stable working condition, the system records detection data in real time, then the average value of the recorded data is taken as a final result, the detection energy consumption is 4.447KWH/NM 3, the hydrogen concentration is 99.813%, and the oxygen concentration is 99.119%. That is, the fifth sample hydrogen concentration was 99.813% and the fifth sample oxygen concentration was 99.119%.
The fourth sample hydrogen concentration 99.734% greater than the fifth sample hydrogen concentration 99.813% greater than the third sample hydrogen concentration 99.803%, the fourth sample oxygen concentration 99.153% greater than the fifth sample oxygen concentration 99.119% greater than the third sample oxygen concentration 99.103% can be obtained through experiments two, three and four, which means that when the hydrogen side alkaline solution flow and the oxygen side alkaline solution flow are closest, the obtained oxygen concentration and hydrogen concentration are the largest, and therefore the preset alkaline solution ratio can be set to be 1:1.
The experimental data of experiments one to four can be shown in table 1 and fig. 9 to 11:
TABLE 1
According to the experimental results from experiment one to experiment four, the energy consumption of the system is hardly influenced when the total alkali liquor flow or the ratio of the hydrogen side alkali liquor flow to the oxygen side alkali liquor flow is changed. By comparing the total flow of the alkali liquor and the ratio of the flow of the alkali liquor on the hydrogen side to the flow of the alkali liquor on the oxygen side, the method can accurately obtain the influence of the flow of the alkali liquor on the purity of the hydrogen and the energy consumption in the transportation of the alkali liquor on the hydrogen side and the transportation of the alkali liquor on the oxygen side, provide guidance for production, and improve the purity of the hydrogen and the oxygen by setting the total flow of the alkali liquor, the flow of the alkali liquor on the hydrogen side and the flow of the alkali liquor on the oxygen side.
To sum up, according to the disclosure, first alkali liquor flow and second alkali liquor flow are determined according to the preset alkali liquor total flow and the preset alkali liquor proportion, then the hydrogen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow, the oxygen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow, and finally the electrolytic tank is controlled to electrolyze the alkali liquor to output hydrogen and oxygen. According to the method, the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device are controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow and the second alkali liquor flow respectively according to the preset total alkali liquor flow and the preset alkali liquor proportion, the flow of the alkali liquor conveyed by the hydrogen side alkali liquor conveying device and the flow of the alkali liquor conveyed by the oxygen side alkali liquor conveying device can be flexibly controlled, and the concentration of hydrogen and oxygen obtained by water electrolysis can be improved.
FIG. 12 is a block diagram of a hydrogen production apparatus according to an exemplary embodiment, as shown in FIG. 12, applied to a hydrogen production system including an electrolyzer, a hydrogen side lye delivery device, and an oxygen side lye delivery device, both ends of the hydrogen side lye delivery device being connected to an input and an output of the electrolyzer, respectively, both ends of the oxygen side lye delivery device being connected to an input and an output of the electrolyzer, respectively. The hydrogen production apparatus 400 includes:
the determining module 401 is configured to determine a target lye flow according to the preset lye total flow and the preset lye proportion, the target lye flow comprising a first lye flow and a second lye flow.
A first control module 402 configured to control the hydrogen side lye delivery device to deliver lye to the electrolyzer at a first lye flow rate and to control the oxygen side lye delivery device to deliver lye to the electrolyzer at a second lye flow rate.
A second control module 403 configured to control the electrolyzer to electrolyze the lye and output hydrogen and oxygen.
In one embodiment, the determination module 401 is configured to:
Distributing the preset alkali liquor total flow according to the preset alkali liquor proportion to obtain a first alkali liquor flow and a second alkali liquor flow, wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset alkali liquor total flow.
In other embodiments, the hydrogen side lye delivery device comprises a first lye circulation pump and a first regulating valve, and the oxygen side lye delivery device comprises a second lye circulation pump and a second regulating valve. The first control module 402:
And controlling the opening of the first regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at the first alkali liquor flow rate.
And controlling the opening of the second regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank by the second alkali liquor flow rate.
FIG. 13 is a block diagram showing another hydrogen production apparatus according to an exemplary embodiment, and as shown in FIG. 13, the hydrogen side lye delivery apparatus further includes a first flowmeter and the oxygen side lye delivery apparatus further includes a second flowmeter. The apparatus 400 further comprises:
A first detection module 404 is configured to detect a first actual flow of lye in the hydrogen side lye delivery device by means of a first flow meter.
A second detection module 405 configured to detect a second actual flow of lye in the oxygen side lye delivery device by means of a second flow meter.
The prompt module 406 is configured to send out prompt information when the first alkali liquor flow rate is not matched with the first actual flow rate and/or the second alkali liquor flow rate is not matched with the second actual flow rate, where the prompt information is used for prompting that the alkali liquor flow rate of the hydrogen production system is abnormal.
In other embodiments, the predetermined total flow of lye is obtained by:
Sequentially controlling the total alkali liquor flow rate to be a plurality of sample alkali liquor flow rates so as to obtain the sample hydrogen concentration and the sample oxygen concentration corresponding to each sample alkali liquor flow rate, wherein the total alkali liquor flow rate is the sum of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device and the alkali liquor flow rate of the oxygen side alkali liquor conveying device.
And determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor.
In other embodiments, the sample lye flow rates include a first sample lye flow rate and a second sample lye flow rate. Sequentially controlling the total alkali liquor flow to be a plurality of sample alkali liquor flows to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to each sample alkali liquor flow, wherein the method comprises the following steps of:
Controlling the total alkali liquor flow to be the first sample alkali liquor flow so as to obtain the first sample hydrogen concentration and the first sample oxygen concentration corresponding to the first sample alkali liquor flow.
Controlling the total alkali liquor flow to be the second sample alkali liquor flow so as to obtain a second sample hydrogen concentration and a second sample oxygen concentration corresponding to the second sample alkali liquor flow, wherein the first sample alkali liquor flow and the second sample alkali liquor flow are different.
And determining the total flow of the preset alkali liquor according to the first sample hydrogen concentration, the first sample oxygen concentration, the second sample hydrogen concentration and the second sample oxygen concentration.
In other embodiments, the preset lye ratio is determined by:
and sequentially controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the plurality of sample alkali liquor ratios to obtain the sample hydrogen concentration and the sample oxygen concentration corresponding to each sample alkali liquor ratio, wherein the hydrogen side alkali liquor flow is the alkali liquor flow of the hydrogen side alkali liquor conveying device, the oxygen side alkali liquor flow is the alkali liquor flow of the oxygen side alkali liquor conveying device, and the sample alkali liquor ratio is the ratio of the hydrogen side alkali liquor flow to the oxygen side alkali liquor flow.
And determining the preset alkali liquor proportion according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the plurality of sample alkali liquor proportions.
In other embodiments, the sample lye ratios include a first sample lye ratio, a second sample lye ratio, and a third sample lye ratio, and sequentially controlling the hydrogen side lye flow and the oxygen side lye flow according to the plurality of sample lye ratios to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample lye ratio includes:
And controlling the flow of the hydrogen side alkali liquor and the flow of the oxygen side alkali liquor according to the first sample alkali liquor proportion to obtain a third sample hydrogen concentration and a third sample oxygen concentration corresponding to the first sample alkali liquor proportion. The first sample alkali liquor proportion is the proportion of first hydrogen side alkali liquor flow and first oxygen side alkali liquor flow, the first hydrogen side alkali liquor flow is the maximum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow is the total preset alkali liquor flow.
And controlling the flow of the hydrogen side alkali liquor and the flow of the oxygen side alkali liquor according to the proportion of the second sample alkali liquor so as to obtain a fourth sample hydrogen concentration and a fourth sample oxygen concentration corresponding to the proportion of the second sample alkali liquor. The second sample alkali liquor proportion is the proportion of second hydrogen side alkali liquor flow and second oxygen side alkali liquor flow, the second hydrogen side alkali liquor flow is the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow is the preset total alkali liquor flow.
And controlling the flow of the hydrogen side alkali liquor and the flow of the oxygen side alkali liquor according to the proportion of the third sample alkali liquor so as to obtain a fifth sample hydrogen concentration and a fifth sample oxygen concentration corresponding to the proportion of the third sample alkali liquor. The ratio of the third sample alkali liquor is the ratio of the third hydrogen side alkali liquor flow to the third oxygen side alkali liquor flow, the third hydrogen side alkali liquor flow is the intermediate value of the maximum alkali liquor flow and the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow is the preset total alkali liquor flow.
To sum up, according to the disclosure, first alkali liquor flow and second alkali liquor flow are determined according to the preset alkali liquor total flow and the preset alkali liquor proportion, then the hydrogen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow, the oxygen side alkali liquor conveying device is controlled to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow, and finally the electrolytic tank is controlled to electrolyze the alkali liquor to output hydrogen and oxygen. According to the method, the hydrogen side alkali liquor conveying device and the oxygen side alkali liquor conveying device are controlled to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow and the second alkali liquor flow respectively according to the preset total alkali liquor flow and the preset alkali liquor proportion, the flow of the alkali liquor conveyed by the hydrogen side alkali liquor conveying device and the flow of the alkali liquor conveyed by the oxygen side alkali liquor conveying device can be flexibly controlled, and the concentration of hydrogen and oxygen obtained by water electrolysis can be improved.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. The preparation method of the hydrogen is characterized by being applied to a hydrogen production system, the hydrogen production system comprises an electrolytic tank, a hydrogen side lye conveying device and an oxygen side lye conveying device, wherein two ends of the hydrogen side lye conveying device are respectively connected with an input end and an output end of the electrolytic tank, and two ends of the oxygen side lye conveying device are respectively connected with the input end and the output end of the electrolytic tank, and the method comprises the following steps:
Determining a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow;
controlling the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate, and controlling the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate;
And controlling the electrolytic tank to electrolyze the alkali liquor, and outputting hydrogen and oxygen.
2. The method according to claim 1, wherein determining the target lye flow based on the preset lye total flow and the preset lye ratio comprises:
And distributing the preset alkali liquor total flow according to the preset alkali liquor proportion to obtain the first alkali liquor flow and the second alkali liquor flow, wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset alkali liquor total flow.
3. The method according to claim 1, wherein the hydrogen side lye delivery device comprises a first lye circulation pump and a first regulating valve, the oxygen side lye delivery device comprises a second lye circulation pump and a second regulating valve, the controlling the hydrogen side lye delivery device to deliver lye to the electrolytic tank according to the first lye flow rate, and the controlling the oxygen side lye delivery device to deliver lye to the electrolytic tank according to the second lye flow rate comprises:
Controlling the opening of the first regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the first alkali liquor circulating pump is conveyed to the electrolytic tank at the first alkali liquor flow rate;
and controlling the opening of the second regulating valve according to the first alkali liquor flow rate so that the alkali liquor output by the second alkali liquor circulating pump is conveyed to the electrolytic tank by the second alkali liquor flow rate.
4. A method according to claim 3, wherein the hydrogen side lye delivery device further comprises a first flow meter and the oxygen side lye delivery device further comprises a second flow meter, the method further comprising:
Detecting a first actual flow rate of the alkali liquor in the hydrogen side alkali liquor conveying device through the first flow meter;
Detecting a second actual flow rate of the lye in the oxygen side lye delivery device by the second flow meter;
And sending prompt information under the condition that the first alkali liquor flow is not matched with the first actual flow and/or the second alkali liquor flow is not matched with the second actual flow, wherein the prompt information is used for prompting that the alkali liquor flow of the hydrogen production system is abnormal.
5. The method according to any one of claims 1 to 4, wherein the preset total lye flow is obtained by:
Sequentially controlling the total alkali liquor flow rate to be a plurality of sample alkali liquor flow rates so as to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor flow rate, wherein the total alkali liquor flow rate is the sum of the alkali liquor flow rate of the hydrogen side alkali liquor conveying device and the alkali liquor flow rate of the oxygen side alkali liquor conveying device;
And determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor.
6. The method of claim 5, wherein the sample lye flow comprises a first sample lye flow and a second sample lye flow, and wherein sequentially controlling the total lye flow to be a plurality of sample lye flows to obtain a sample hydrogen concentration and a sample oxygen concentration for each of the sample lye flows comprises:
Controlling the total alkali liquor flow rate to be the first sample alkali liquor flow rate so as to obtain a first sample hydrogen concentration and a first sample oxygen concentration corresponding to the first sample alkali liquor flow rate;
Controlling the total alkali liquor flow rate to be the second sample alkali liquor flow rate so as to obtain a second sample hydrogen concentration and a second sample oxygen concentration corresponding to the second sample alkali liquor flow rate, wherein the first sample alkali liquor flow rate and the second sample alkali liquor flow rate are different;
the determining the total flow of the preset alkali liquor according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the flow of the plurality of sample alkali liquor comprises:
And determining the total flow of the preset alkali liquor according to the first sample hydrogen concentration, the first sample oxygen concentration, the second sample hydrogen concentration and the second sample oxygen concentration.
7. The method according to any one of claims 1 to 4, wherein the preset lye ratio is determined by:
Sequentially controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to a plurality of sample alkali liquor ratios to obtain a sample hydrogen concentration and a sample oxygen concentration corresponding to each sample alkali liquor ratio, wherein the hydrogen side alkali liquor flow is the alkali liquor flow of the hydrogen side alkali liquor conveying device, the oxygen side alkali liquor flow is the alkali liquor flow of the oxygen side alkali liquor conveying device, and the sample alkali liquor ratio is the ratio of the hydrogen side alkali liquor flow to the oxygen side alkali liquor flow;
and determining the preset alkali liquor proportion according to the sample hydrogen concentration and the sample oxygen concentration corresponding to the plurality of sample alkali liquor proportions.
8. The method of claim 7, wherein the sample lye ratios include a first sample lye ratio, a second sample lye ratio, and a third sample lye ratio, and wherein sequentially controlling the hydrogen side lye flow and the oxygen side lye flow according to the plurality of sample lye ratios to obtain the corresponding sample hydrogen concentration and sample oxygen concentration for each of the sample lye ratios includes:
Controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the first sample alkali liquor proportion to obtain a third sample hydrogen concentration and a third sample oxygen concentration corresponding to the first sample alkali liquor proportion, wherein the first sample alkali liquor proportion is the proportion of a first hydrogen side alkali liquor flow and a first oxygen side alkali liquor flow, the first hydrogen side alkali liquor flow is the maximum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the first hydrogen side alkali liquor flow and the first oxygen side alkali liquor flow is the preset total alkali liquor flow;
controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the second sample alkali liquor proportion to obtain a fourth sample hydrogen concentration and a fourth sample oxygen concentration corresponding to the second sample alkali liquor proportion, wherein the second sample alkali liquor proportion is the proportion of a second hydrogen side alkali liquor flow and a second oxygen side alkali liquor flow, the second hydrogen side alkali liquor flow is the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the second hydrogen side alkali liquor flow and the second oxygen side alkali liquor flow is the preset total alkali liquor flow;
And controlling the hydrogen side alkali liquor flow and the oxygen side alkali liquor flow according to the third sample alkali liquor proportion to obtain a fifth sample hydrogen concentration and a fifth sample oxygen concentration corresponding to the third sample alkali liquor proportion, wherein the third sample alkali liquor proportion is the ratio of the third hydrogen side alkali liquor flow to the third oxygen side alkali liquor flow, the third hydrogen side alkali liquor flow is the intermediate value of the maximum alkali liquor flow and the minimum alkali liquor flow corresponding to the hydrogen side alkali liquor conveying device, and the sum of the third hydrogen side alkali liquor flow and the third oxygen side alkali liquor flow is the preset total alkali liquor flow.
9. The hydrogen preparation device is characterized by being applied to a hydrogen preparation system, the hydrogen preparation system comprises an electrolytic tank, a hydrogen side lye conveying device and an oxygen side lye conveying device, wherein two ends of the hydrogen side lye conveying device are respectively connected with an input end and an output end of the electrolytic tank, two ends of the oxygen side lye conveying device are respectively connected with the input end and the output end of the electrolytic tank, and the hydrogen preparation device comprises:
The determining module is configured to determine a target alkali liquor flow according to the preset alkali liquor total flow and the preset alkali liquor proportion, wherein the target alkali liquor flow comprises a first alkali liquor flow and a second alkali liquor flow;
The first control module is configured to control the hydrogen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the first alkali liquor flow rate and control the oxygen side alkali liquor conveying device to convey alkali liquor to the electrolytic tank according to the second alkali liquor flow rate;
and the second control module is configured to control the electrolysis tank to electrolyze the alkali liquor and output hydrogen and oxygen.
10. The apparatus of claim 9, wherein the determination module is configured to:
And distributing the preset alkali liquor total flow according to the preset alkali liquor proportion to obtain the first alkali liquor flow and the second alkali liquor flow, wherein the sum of the first alkali liquor flow and the second alkali liquor flow is the preset alkali liquor total flow.
CN202310627714.4A 2023-05-30 2023-05-30 Method and device for preparing hydrogen Pending CN119061438A (en)

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Application Number Priority Date Filing Date Title
CN202310627714.4A CN119061438A (en) 2023-05-30 2023-05-30 Method and device for preparing hydrogen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310627714.4A CN119061438A (en) 2023-05-30 2023-05-30 Method and device for preparing hydrogen

Publications (1)

Publication Number Publication Date
CN119061438A true CN119061438A (en) 2024-12-03

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CN202310627714.4A Pending CN119061438A (en) 2023-05-30 2023-05-30 Method and device for preparing hydrogen

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