CN111575737B - Safety protection system of ion membrane electrolytic cell - Google Patents
Safety protection system of ion membrane electrolytic cell Download PDFInfo
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Abstract
The safety protection system of the ion membrane electrolytic cell comprises a controller, wherein a triple interlocking mechanism is arranged in the controller and is used for outputting an interlocking stop signal to a field control device when the triple interlocking mechanism is triggered; the first double-interlocking mechanism calculates the operating voltage of each ionic membrane unit according to the acquired current, compares the operating voltage with a set safe operating voltage threshold value, and judges whether to trigger alarm or not according to a comparison result; the voltage acquisition module is used for acquiring the voltage of the single ionic membrane unit and the total voltage of the electrolytic tank, the second interlocking mechanism calculates the voltage sum of all the ionic membrane units of the electrolytic tank and compares the voltage sum with the total voltage of the electrolytic tank, and whether an alarm is triggered or not is judged according to the comparison result; the comparison module is used for comparing the voltages of the adjacent ionic membrane units, and the third interlocking mechanism judges whether to trigger alarm or not according to the comparison result; and the alarm module is used for sending out an alarm signal when any one double interlocking mechanism in the triple interlocking mechanism is triggered.
Description
Technical Field
The invention belongs to the technical field of safety, and particularly relates to a safety protection system of an ion membrane electrolytic cell.
Background
The existing safety protection of the ion membrane electrolytic cell adopts a voltage value average value interlocking mode, namely, the voltage value of each unit cell ion membrane is collected and monitored, data is refreshed once per second, the average value under the current load is calculated, an artificially set threshold value is added on the basis of the average value, then the deviation value of each unit cell ion membrane is added on the basis, and the voltage interlocking value is set. When the voltage of the ionic membrane of any unit cell in the electrolytic cell exceeds a set value, the controller sends an interlocking stop signal to the field control equipment. Because the ionic membrane electrolytic cell can be introduced with currents of different sizes according to the requirements of production load, the cell voltages corresponding to different currents are different, and the characteristics, the operation curve and the slope of each ionic membrane, and the deterioration conditions of each ionic membrane pinhole and the cathode and anode coatings are different. In addition, in the process of current rising and falling, the voltage slope is changed continuously, the voltage curve is not a smooth curve, if the fixed value and the deviation value are reinforced by the average value only to serve as the interlocking voltage of the whole electrolytic cell, the interlocking value of a certain ion membrane is larger or smaller, and the interlocking must be released when the interlocking threshold value or deviation value is manually set, so that the operation mode and the interlocking mode cannot ensure the safe operation of the electrolytic cell, and the condition of interlocking and false tripping caused by human errors also exists.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the ionic membrane electrolytic cell safety protection system which can effectively avoid the phenomenon of mistaken tripping caused by abnormal reasons and can ensure the safe operation of the electrolytic cell.
The technical scheme adopted by the invention is as follows:
ion membrane electrolytic cell safety protection system, its characterized in that: comprises that
The controller is internally provided with a triple interlocking mechanism and is used for outputting an interlocking stop signal to the field control equipment when the triple interlocking mechanisms are all triggered;
the first double-interlocking mechanism calculates the operating voltage of each ionic membrane unit according to the acquired current, compares the operating voltage with a set safe operating voltage threshold value, and judges whether to trigger alarm or not according to a comparison result;
the voltage acquisition module is used for acquiring the voltage of the single ionic membrane unit and the total voltage of the electrolytic tank, the second interlocking mechanism calculates the voltage sum of all the ionic membrane units of the electrolytic tank and compares the voltage sum with the total voltage of the electrolytic tank, and whether an alarm is triggered or not is judged according to the comparison result;
the comparison module is used for comparing the voltages of the adjacent ionic membrane units, and the third interlocking mechanism judges whether to trigger alarm or not according to the comparison result;
the alarm module is used for sending out an alarm signal when any one double interlocking mechanism in the triple interlocking mechanism is triggered;
the current acquisition module, the voltage acquisition module, the comparison module and the alarm module are all connected with the controller.
Further, the triggering condition of the first re-interlock mechanism is as follows:
(1) calculating the expected voltage of safe operation of each unit slot ion membrane as a safe operation voltage threshold;
(2) and calculating the collected running current of the electrolytic cell to obtain the theoretical running voltage of each ionic membrane unit, and triggering a first safety alarm when the theoretical running voltage exceeds a set safe running voltage threshold value.
Further, the calculation process of the expected voltage for safe operation of each unit slot ion membrane is as follows:
calculating the current standard voltage V according to the slope of the current-voltage curveTheory 1Setting the threshold V on the basis of the theoretical voltageDeviation 1As high alarm value VHHThe calculation method is as follows:
VHH-vtriq 1+ vtq 1;
VHH: a high alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, which is a positive rational number;
meanwhile, the alarm value of the minimum voltage of the electrolytic cell in any running current is set as VLLWherein:
VLL ═ vtol, theory 1-vu deviation value 1;
VLL: a low alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, which is a positive rational number;
when the cell voltage of the electrolytic cell unit exceeds VHHAnd VLLA first safety alarm is triggered, and a voltage limit value is set on the basis of the first safety alarm: vHHH，VHHHIs a fixed value, the voltage of the unit cell of the electrolytic cell only needs to exceed V at any time when the voltage of the unit cell of the electrolytic cell is operatedHHHAnd triggering a safety protection signal.
Further, the calculation process of the theoretical operating voltage of each ionic membrane unit is as follows:
set V0Is to obtain V by the theoretical decomposition voltage of the ion-exchange membrane electrolyzer0Current value at the moment I0；
First obtaining I1Voltage V at run time1Obtaining I2Voltage V at run time2(ii) a Wherein I1-I0＝1kA，I2-I11kA, (the difference can be set, and ranges from 0.1 to 2kA, as exemplified by 1 kA); at this time I1And I2The slope of the curve between is K1，I0And I1The slope of the curve is K0，
The operation slope at the interval current is known as follows: k0、K1、K2、K3……Kn-1、KnWherein n is the corresponding current value and voltage value when the electrolytic bath runs at full load;
theoretical operating voltage V of ionic membrane unitTheory 2：
V theory 2 Kn In + V0.
Or, the calculation process of the theoretical operating voltage of each ionic membrane unit is as follows:
set V0Is to obtain V by the theoretical decomposition voltage of the ion-exchange membrane electrolyzer0Current value at the moment I0；
When the operating current of the electrolytic cell reaches the full load ImaxThe voltage value collected at the same time is VmaxThe current operating curve is regarded as a straight line, and K ismaxThe values are:
ionic membrane sheetTheoretical operating voltage V of the cellTheory 3：
V theory 3 ═ Kmax In + V0.
Or, the calculation process of the theoretical operating voltage of each ionic membrane unit is as follows:
set V0Is to obtain V by the theoretical decomposition voltage of the ion-exchange membrane electrolyzer0Current value at the moment I0；
Obtaining an electrolytic cell IRun 4Actual measurement voltage V at stateActual measurement 4At this time, the current I is calculatedRun 4Theoretical voltage of time VTheory 4：
Further, the triggering condition of the second override mechanism is as follows:
and triggering a second safety alarm when the voltage sum of all the ionic membrane units of the electrolytic cell is not equal to the total voltage of the electrolytic cell.
Further, when the first double-safety alarm is triggered, if the second double-interlocking mechanism calculates that the sum of the voltages of all the ionic membrane units of the electrolytic cell is equal to the total voltage of the electrolytic cell, the operation of the electrolytic cell is judged to be in a normal state.
Further, the triggering condition of the third interlock mechanism is as follows:
when the electrolytic cell runs under low load, the operation tends to be stable, at the moment, the voltages of the adjacent ionic membrane units are compared, if the voltage difference value of the adjacent ionic membrane units is smaller than or equal to a set threshold value, the electrolytic cell is judged to be in a normal state, and if the voltage difference value of the adjacent ionic membrane units is larger than the set threshold value, a third safety alarm is triggered.
Further, the condition of the low load operation of the electrolytic cell is that the operating current I of the electrolytic cell is 4kA < I < full load.
Further, the set threshold value of the voltage difference is ± 0.1.
The invention has the beneficial effects that: the vehicle-jumping error caused by module abnormity, line abnormity and other reasons can be effectively avoided. The three interlocking modes are complementary, the voltage is detected in the same way, the problem of mistaken tripping of the electrolytic cell caused by the defect of a single interlocking mode is solved, different interlocks give different prompts during alarming, and the purpose of safe operation of the electrolytic cell is achieved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram illustrating the setting of the safe operation voltage threshold according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present embodiment provides a safety protection system for an ion membrane electrolyzer, comprising
The controller is internally provided with a triple interlocking mechanism and is used for outputting an interlocking stop signal to the field control equipment when the triple interlocking mechanisms are all triggered;
the first double-interlocking mechanism calculates the operating voltage of each ionic membrane unit according to the acquired current, compares the operating voltage with a set safe operating voltage threshold value, and judges whether to trigger alarm or not according to a comparison result;
the voltage acquisition module is used for acquiring the voltage of the single ionic membrane unit and the total voltage of the electrolytic tank, the second interlocking mechanism calculates the voltage sum of all the ionic membrane units of the electrolytic tank and compares the voltage sum with the total voltage of the electrolytic tank, and whether an alarm is triggered or not is judged according to the comparison result;
the comparison module is used for comparing the voltages of the adjacent ionic membrane units, and the third interlocking mechanism judges whether to trigger alarm or not according to the comparison result;
the alarm module is used for sending out an alarm signal when any one double interlocking mechanism in the triple interlocking mechanism is triggered;
the current acquisition module, the voltage acquisition module, the comparison module and the alarm module are all connected with the controller.
The triggering condition of the first re-interlock mechanism of this embodiment is as follows:
(1) calculating the expected voltage of safe operation of each unit slot ion membrane as a safe operation voltage threshold;
each ionic membrane and the cathode and anode that make up the unit have different operating characteristics at different currents. And each ionic membrane has difference, the operation curves of different positions and different loads are different, the expected voltage for safe operation of each unit slot ionic membrane is calculated through an algorithm, the operation voltage is in the voltage range, the ionic membrane is considered to be a safe voltage, if the operation voltage exceeds the voltage range, the ionic membrane is considered to be in danger, and meanwhile, the system alarms or is interlocked.
Wherein the calculation process of the expected voltage of the safe operation of each unit slot ion membrane is as follows:
calculating the current standard voltage V according to the slope of the current-voltage curveTheory 1Setting the threshold V on the basis of the theoretical voltageDeviation 1As high alarm value VHHThe calculation method is as follows:
VHH-vtriq 1+ vtq 1;
VHH: a high alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, which is a positive rational number;
simultaneously, the alarm value of the minimum voltage of the electrolytic cell in any running current is set as VLLWherein:
VLL ═ V theory 1-V deviation value 1;
VLL: a low alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, which is a positive rational number;
when the cell voltage of the electrolytic cell unit exceeds VHHAnd VLLA first safety alarm is triggered, and a voltage limit value is set on the basis of the first safety alarm: vHHH，VHHHIs a fixed value, the voltage of the unit cell of the electrolytic cell only needs to exceed V at any time when the voltage of the unit cell of the electrolytic cell is operatedHHHAnd triggering a safety protection signal.
(2) And calculating the collected running current of the electrolytic cell to obtain the theoretical running voltage of each ionic membrane unit, and triggering a first safety alarm when the theoretical running voltage exceeds a set safe running voltage threshold value.
Monitoring the running current (rectifier current) I1 of the electrolytic cell through hardware, simultaneously acquiring the actually measured voltage V1 in the current state, acquiring the cycle of the system for 1s, simultaneously acquiring the running current (rectifier current) I2 after 1s, calculating the theoretical voltage V2 in the running current I2 through V0 (constant: theoretical decomposition voltage of the ionic membrane electrolytic cell), setting a certain threshold value as an interlocking value of the value in the V2, and triggering a first safety alarm when the running current reaches I2 and the voltage value V2 exceeds the set threshold value.
Specifically, as shown in FIG. 2, V is set0Is to obtain V by the theoretical decomposition voltage of the ion-exchange membrane electrolyzer0Current value at time I0；
Set V0The theoretical decomposition voltage of the ionic membrane electrolytic cell is used for obtaining V0Current value at the moment I0；
First obtaining I1Voltage V at run time1Obtaining I2Voltage V at run time2(ii) a Wherein I1-I0＝1kA，I2-I11kA, (the difference can be set, and ranges from 0.1 to 2kA, as exemplified by 1 kA); at this time I1And I2The slope of the curve between is K1，I0And I1The slope of the curve is K0，
The operation slope at the interval current is known as follows: k0、K1、K2、K3……Kn-1、KnWherein n is the corresponding current value and voltage value when the electrolytic bath runs at full load;
theoretical operating voltage V of ionic membrane unitTheory 2：
V theory 2 Kn In + V0.
Providing a second calculation method, regarding the running current and voltage as a linear curve, and calculating the total slope KmaxThe two methods can select one of the two methods according to the actual operation condition of the user. The calculation method is as follows:
set V0Is to obtain V by the theoretical decomposition voltage of the ion-exchange membrane electrolyzer0Current value at the moment I0；
When the operating current of the electrolytic cell reaches the full load ImaxThe voltage value collected at the same time is VmaxThe current operating curve is regarded as a straight line, and K ismaxThe values are:
theoretical operating voltage V of ionic membrane unitTheory 3：
V theory 3 ═ Kmax In + V0.
Since the running performance of the electrolytic cell gradually deteriorates with time, the electrolytic cell is normally started-run-stopped for one maintenance cycle every year, so that the interval slope is corrected again at each start-up of the electrolytic cell. The slope of each calculated interval is taken as the standard.
It is of course also possible to obtain an electrolysis cell IRun 4Actual measurement voltage V at stateActual measurement 4At this time, the current I is calculatedRun 4Theoretical voltage of time VTheory 4：
Namely, the theoretical value calculation mode of the invention has various modes, so as to be determined according to the actual operation condition of the user.
The triggering conditions of the second override mechanism in this embodiment are as follows:
and triggering a second safety alarm when the voltage sum of all the ionic membrane units of the electrolytic cell is not equal to the total voltage of the electrolytic cell.
When the first double safety alarm is triggered, if the second double interlocking mechanism calculates that the voltage sum of all the ionic membrane units of the electrolytic cell is equal to the total voltage of the electrolytic cell, the operation of the electrolytic cell is judged to be in a normal state.
The second interlocking is to monitor the voltage of the whole electrolytic cell, and has a monitoring point for the voltage of the whole electrolytic cell, the voltage of the whole electrolytic cell is sent out by an independent sensor, the signal of the sensor is not influenced by the communication mode of the previous unit voltage, and the sensor is directly collected from the equipment and sent to the programmable controller by a transmitter. The method eliminates a false vehicle jump caused by unstable current or signal or abnormal signal.
Specifically, the voltage of a single chip is collected and the sum V is calculatedCalculate the total 1Collecting the total voltage VMeasuring assembly 1In the case of a positive cell operation, VCalculate the total 1＝VMeasuring assembly 1When the current signal of the electrolytic cell system is lost or broken, the first double-interlocking can perform false operation, and at the moment, if the second double-interlocking is normal, the operation of the electrolytic cell is judged to be in a normal state. And false alarms caused by signal disconnection and signal loss of the first double interlocking are shielded. And simultaneously, the system gives corresponding alarm information to inform field operators.
Specifically, 1, obtaining an operation state signal Run of a rectifier during the operation of the electrolytic cell and an operation current I of the rectifierRun 3Obtaining the total voltage V of the cellMeasuring assembly 2Obtaining the voltage value V of each unit cell of the electrolytic cell1、V2、V3……VnAnd calculating the total voltage VCalculate total 2：
n: an upper bound representing the maximum number of unit cells in the cell;
i: lower bound, starting from 1;
k: the sum is taken from i, up to n, and all are added.
If IRun 3<3kA while the rectifier operating status signal is present Run ═ 1, and VMeasuring assembly 2≥VCalculate total 2And triggering a second safety alarm.
2. Obtaining the running state signal Run of the rectifier when the electrolytic cell runs and obtaining the measured total voltage V of the electrolytic cellMeasurement Total 3Obtaining the calculated total voltage V of the electrolytic cellTotal of 3：
VMeasurement Total 3-VTotal of 3When V, the absolute value of V exceeds the set value VSetting 1And triggering a second safety alarm when the threshold value is reached.
V-V is set to 1| >1.5
The triggering conditions of the third interlock mechanism in this embodiment are as follows:
when the electrolytic cell runs under low load, the operation tends to be stable, at the moment, the voltages of the adjacent ionic membrane units are compared, if the voltage difference value of the adjacent ionic membrane units is smaller than or equal to a set threshold value, the electrolytic cell is judged to be in a normal state, and if the voltage difference value of the adjacent ionic membrane units is larger than the set threshold value, a third safety alarm is triggered.
Specifically, each ionic membrane unit of each electrolytic cell, which is located at a different position of the electrolytic cell, the relationship with the adjacent unit and the position of the ionic membrane unit determine the operation characteristics of the ionic membrane unit, and the voltage of the ionic membrane unit can be changed due to the change of current and the change of current signals during operation. By comparing adjacent cells, it can also be known whether the voltage of the current film is normal or abnormal. Generally speaking, there is a slight voltage difference between different positions, and in low-load operation, the cell voltages at the two ends of the cell and in the middle of the cell are different, and generally show a situation that the two ends are high and the middle is low. If the two voltages of the adjacent units present a high-low situation due to the problem of the hardware acquisition unit, but the average value of the two voltages is within a safety range, so that the two voltages are judged together by an algorithm and the previous hardware acquisition, the interlocking is not started, and only the alarm needs to be prompted, so that the unnecessary parking can be avoided.
When the running current is 3kA < I < (full load), the operation tends to be stable at the same time, namely, the voltages of the two adjacent unit cells are compared, and when the difference value V of the two adjacent unit cells is less than or equal to +/-0.1 (the range is adjustable), the electrolytic cell is judged to be in a normal running state. When the system is in normal operation, if the value is V > +/-0.1, the system sends out an alarm signal.
Specifically, obtaining the running current I of the electrolytic cellRun 5Running current I after 10minRun 6Obtaining cell voltage V of the electrolytic cell unit1、V2、V3……Vn-1、Vn(ii) a Current IRun 5> 3kA, and IRun 6-IRun 5At < 100A:
for the first die slot:
|V1-V2|>0.1；
for the middle die cell slot:
Vn-V (n-1) | >0.1 or Vn-V (n +1) | > 0.1;
for the last piece of cell slot:
|Vn-V(n-1)|>0.1。
the three-way interlocking triggers an electrolyzer alarm signal when any one of the three ways is abnormal by detecting the voltage difference of the corresponding electrolyzer, and sends a stop signal to the field control equipment when the three ways are abnormal simultaneously.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (7)
1. Ion membrane electrolytic cell safety protection system, its characterized in that: comprises that
The controller is internally provided with a triple interlocking mechanism and is used for outputting an interlocking stop signal to the field control equipment when the triple interlocking mechanisms are all triggered;
the first double-interlocking mechanism calculates the operating voltage of each ionic membrane unit according to the acquired current, compares the operating voltage with a set safe operating voltage threshold value, and judges whether to trigger alarm or not according to a comparison result; wherein the triggering condition of the first re-interlock mechanism is as follows:
(1) calculating the expected voltage of safe operation of each unit slot ion membrane as a safe operation voltage threshold;
(2) calculating the collected running current of the electrolytic cell to obtain the theoretical running voltage of each ionic membrane unit, and triggering a first safety alarm when the theoretical running voltage exceeds a set safe running voltage threshold;
the voltage acquisition module is used for acquiring the voltage of the single ionic membrane unit and the total voltage of the electrolytic tank, the second interlocking mechanism calculates the voltage sum of all the ionic membrane units of the electrolytic tank and compares the voltage sum with the total voltage of the electrolytic tank, and whether an alarm is triggered or not is judged according to the comparison result; wherein the triggering condition of the second override mechanism is as follows:
when the voltage sum of all the ionic membrane units of the electrolytic cell is not equal to the total voltage of the electrolytic cell, triggering a second safety alarm;
the comparison module is used for comparing the voltages of the adjacent ionic membrane units, and the third interlocking mechanism judges whether to trigger alarm or not according to the comparison result; the triggering conditions for the third interlock mechanism are as follows:
when the electrolytic bath runs under low load, the operation tends to be stable, the voltages of the adjacent ionic membrane units are compared, if the voltage difference value of the adjacent ionic membrane units is less than or equal to a set threshold value, the electrolytic bath is judged to be in a normal state, and if the voltage difference value of the adjacent ionic membrane units is greater than the set threshold value, a third safety alarm is triggered;
the alarm module is used for sending out an alarm signal when any one double interlocking mechanism in the triple interlocking mechanism is triggered;
the current acquisition module, the voltage acquisition module, the comparison module and the alarm module are all connected with the controller.
2. The ionic membrane electrolyzer safety protection system of claim 1, characterized in that:
the calculation process of the expected voltage of safe operation of each unit slot ion membrane is as follows:
calculating the current standard voltage V according to the slope of the current-voltage curveTheory 1Setting the threshold V on the basis of the theoretical voltageDeviation 1As high alarm value VHHThe calculation method is as follows:
VHH＝Vtheory 1+VDeviation value 1；
VHH: a high alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, wherein the value is a positive rational number;
simultaneously, the alarm value of the minimum voltage of the electrolytic cell in any running current is set as VLLWherein:
VLL＝Vtheory 1-VDeviation value 1；
VLL: a low alarm value;
Vtheory 1: calculating standard voltage through a current-voltage curve relation;
Vdeviation value 1: manually setting a value, which is a positive rational number;
when the cell voltage of the electrolytic cell unit exceeds VHHAnd VLLA first safety alarm is triggered, and a voltage limit value is set on the basis of the first safety alarm: vHHH，VHHHIs a fixed value, the cell voltage of the electrolytic cell is only the cell voltage at any time during the operationTo exceed VHHHAnd triggering a safety protection signal.
3. The ionic membrane electrolyzer safety protection system of claim 2, characterized in that:
the theoretical operation voltage of each ionic membrane unit is calculated as follows:
set V0The theoretical decomposition voltage of the ionic membrane electrolytic cell is used for obtaining V0Current value at the moment I0；
First obtaining I1Voltage V at run time1Obtaining I2Voltage V at run time2(ii) a Wherein I1-I0＝1kA，I2-I11kA, then I1And I2The slope of the curve between is K1，I0And I1The slope of the curve is K0，
The operation slope at the interval current is known as follows: k0、K1、K2、K3……Kn-1、KnWherein In and Vn are corresponding current values and voltage values when the electrolytic cell runs at full load;
theoretical operating voltage V of ionic membrane unitTheory 2：
VTheory 2＝Kn*In+V0。
4. The ionic membrane electrolyzer safety protection system of claim 2, characterized in that:
the theoretical operation voltage of each ionic membrane unit is calculated as follows:
set V0The theoretical decomposition voltage of the ionic membrane electrolytic cell is used for obtaining V0Current value at the moment I0；
When the operating current of the electrolytic cell reaches the full load ImaxThe voltage value collected at the same time is VmaxThe current operating curve is regarded as a straight line, and K ismaxThe values are:
theoretical operating voltage V of ionic membrane unitTheory 3：
VTheory 3＝Kmax*In+V0，
Wherein In is the corresponding current value when the electrolytic cell is operated at full load.
5. The ionic membrane electrolyzer safety protection system of claim 2, characterized in that:
the theoretical operation voltage of each ionic membrane unit is calculated as follows:
set V0The theoretical decomposition voltage of the ionic membrane electrolytic cell is used for obtaining V0Current value at the moment I0；
Obtaining an electrolytic cell IRun 4Actual measurement voltage V at stateActual measurement 4At this time, the current I is calculatedRun 4Theoretical voltage of time VTheory 4：
6. The ionic membrane electrolyzer safety protection system of claim 1, characterized in that: when the first double safety alarm is triggered, if the second double interlocking mechanism calculates that the voltage sum of all the ionic membrane units of the electrolytic cell is equal to the total voltage of the electrolytic cell, the operation of the electrolytic cell is judged to be in a normal state.
7. The ionic membrane electrolyzer safety protection system of claim 1, characterized in that: the condition of low-load operation of the electrolytic cell is that the operation current I of the electrolytic cell is more than 4kA and less than full load; the set threshold value of the voltage difference is ± 0.1.
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