An automatic liquid filling replacement control method and system for an electrolytic cell starting process

Abstract

The application relates to an automatic liquid filling replacement control method and system for an electrolytic cell starting process, which comprises the following steps: controlling the filling of a set amount of nitrogen into the electrolytic cell; filling cathode liquid and anode liquid into the corresponding poles of the electrolytic cell according to preset flow parameters; dynamically adjusting the filling flow of the cathode liquid according to the obtained liquid pressure difference data of the cathode and anode of the electrolytic cell; when the filling of the anode liquid reaches a set time, the filling flow of the cathode liquid and the anode liquid is adjusted to a set liquid filling flow, and a pre-set liquid discharge valve is opened; when overflow is detected in each outlet hose of the electrolytic cell within a set time period, the filling flow of the cathode liquid and the anode liquid is adjusted to zero, and the liquid discharge valve is closed; when the oxygen content of the gas is less than a set oxygen content threshold, an electrolytic cell liquid filling replacement completion signal is output. The application reduces the labor intensity of the operator and the damage risk to the electrolytic equipment, and improves the stability and safety of the electrolytic cell starting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic cell starting, and in particular to an automatic liquid filling replacement control method and system for electrolytic cell starting. BACKGROUND

[0002] Liquid filling and replacement of an electrolytic cell is an important link in the starting process of the electrolytic cell. Currently, in the process of liquid filling and replacement, the nitrogen filling amount, cathode liquid filling amount, anode liquid filling amount, etc. need to be adjusted, and in the adjustment process, the valve opening degree needs to be repeatedly adjusted by the staff to achieve the appropriate filling flow rate, which causes the operator to spend a lot of time to adjust and a lot of experience to accumulate, and there is a large error due to manual operation. Especially in the process of cathode cathode liquid filling and anode liquid filling, in order to ensure the stable pressure difference of the electrolytic cell anode and cathode liquid, the opening degree of the two valves needs to be repeatedly adjusted by the operator according to experience, which greatly increases the working intensity of the operator.

[0003] Therefore, there is an urgent need for a technical solution that can automatically complete the liquid filling and replacement process in the starting process of the electrolytic cell. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides an automatic liquid filling replacement control method and system for electrolytic cell starting, which solves the technical problems of high-intensity liquid filling adjustment and the risk of equipment damage caused by human error in the process of electrolytic cell liquid filling and replacement.

[0006] (II) Technical solutions

[0007] In order to achieve the above-mentioned purposes, the main technical solutions adopted by the present application include:

[0008] In a first aspect, the present application provides an automatic liquid filling replacement control method for electrolytic cell starting, comprising:

[0009] controlling the filling of a set amount of nitrogen into the electrolytic cell;

[0010] filling the cathode liquid and the anode liquid into the corresponding poles of the electrolytic cell according to the preset flow rate parameters;

[0011] dynamically adjusting the filling flow rate of the cathode liquid according to the obtained liquid phase pressure difference data of the anode and cathode of the electrolytic cell;

[0012] when the anode liquid filling reaches the set time, the filling flow rate of the cathode liquid and the anode liquid is adjusted to the set liquid filling flow rate, and the pre-set liquid discharge valve is opened;

[0013] Monitoring each outlet hose of the electrolytic cell, when overflow is detected in a set time period, the filling flow of catholyte and anolyte is adjusted to zero, and the liquid discharge valve is controlled to be closed;

[0014] Obtaining the oxygen content data of the gas in the electrolytic cell liquid filling replacement pipeline, when it is determined that the oxygen content is less than the set oxygen content threshold, an electrolytic cell liquid filling replacement completion signal is output.

[0015] Optionally, the control of filling the electrolytic cell with a set amount of nitrogen gas comprises:

[0016] The pre-set gas control valve including the hydrogen gas vent valve, the chlorine gas absorption valve, the cathode gas overflow valve, the anode gas overflow valve and the nitrogen filling valve are opened;

[0017] According to the set 30Nm 3 / h~40Nm 3 / h of the filling gas flow, the electrolytic cell is filled with a set amount of nitrogen gas.

[0018] Optionally, according to the pre-set flow parameter, the catholyte and anolyte are respectively filled into the corresponding electrode of the electrolytic cell, which comprises:

[0019] After the gas control valve is opened and the electrolytic cell is filled with a set amount of nitrogen gas, the catholyte is filled into the cathode of the electrolytic cell according to the set first liquid filling flow, wherein the first liquid filling flow is 13m 3 / h~16m 3 / h.

[0020] After the catholyte is filled into the cathode of the electrolytic cell, the liquid phase pressure difference data of the cathode and anode of the electrolytic cell is obtained;

[0021] Determine whether the liquid phase pressure difference data reaches the set threshold range of 0.2mH2O~0.5mH2O;

[0022] When the liquid phase pressure difference data reaches the set threshold range of 0.2mH2O~0.5mH2O, the anolyte is filled into the anode of the electrolytic cell according to the set second liquid filling flow, wherein the second liquid filling flow is 15m 3 / h~30m 3 / h.

[0023] Optionally, according to the obtained liquid phase pressure difference data of the cathode and anode of the electrolytic cell, the filling flow of the catholyte is dynamically adjusted, which comprises:

[0024] When the cathode and anode of the electrolytic cell are filled with liquid, the liquid phase pressure difference data of the cathode and anode of the electrolytic cell is obtained;

[0025] Determine whether the liquid phase pressure difference data is within the set threshold range of 0.2mH2O~0.5mH2O;

[0026] If the liquid phase pressure difference data is less than 0.2 mH2O, then the cathode liquid filling flow rate is controlled from 13 m 3 / h to 16 m 3 / h to 17 m 3 / h to 40 m 3 / h.

[0027] If the liquid phase pressure difference data is within the threshold range of 0.2 mH2O to 0.5 mH2O, then the existing cathode liquid filling flow rate is maintained.

[0028] If the liquid phase pressure difference data is greater than 0.5 mH2O, then the cathode liquid filling flow rate is controlled from 13 m 3 / h to 16 m 3 / h to 8 m 3 / h to 12 m 3 / h.

[0029] Optionally, when the anode liquid filling reaches the set time, the cathode liquid filling flow rate and the anode liquid filling flow rate are adjusted to the set liquid filling flow rate, and the pre-set liquid discharge valve is controlled to open, including:

[0030] Obtaining the volume data of the electrolytic cell;

[0031] Based on the volume data of the electrolytic cell, the anode liquid filling time required for the electrolytic cell to be filled is obtained;

[0032] When the anode liquid filling reaches the anode liquid filling time required for the electrolytic cell to be filled, the cathode liquid filling flow rate and the anode liquid filling flow rate are adjusted to the set third liquid filling flow rate, and the pre-set liquid discharge valve is controlled to open, wherein the third liquid filling flow rate is 2 m 3 / h to 8 m 3 / h.

[0033] Optionally, each outlet hose of the electrolytic cell is monitored, and when overflow is detected in the set time period, the cathode liquid filling flow rate and the anode liquid filling flow rate are adjusted to zero, and the liquid discharge valve is controlled to close, including:

[0034] Based on the obtained overflow monitoring data of each outlet hose of the electrolytic cell, it is determined whether overflow exists in each outlet hose of the electrolytic cell in the set time period;

[0035] If one or more outlet hoses of the electrolytic cell do not have overflow in the set time period, then the cathode liquid filling flow rate and the anode liquid filling flow rate are adjusted to zero, and a liquid filling abnormal signal is output;

[0036] If overflow exists in each outlet hose of the electrolytic cell in the set time period, then the cathode liquid filling flow rate and the anode liquid filling flow rate are adjusted to zero, and the liquid discharge valve is controlled to close.

[0037] Optionally, the oxygen content of the gas in the electrolytic tank liquid replacement pipeline is acquired, and when it is determined that the oxygen content of the gas is less than a set oxygen content threshold, an electrolytic tank liquid replacement completion signal is output.

[0038] The opening of the hydrogen vent valve is adjusted to a set value, and a pre-set nitrogen analysis shutoff valve is opened;

[0039] When the gas in the electrolytic tank liquid replacement pipeline flows into the pre-set nitrogen oxygen analyzer, the nitrogen oxygen analyzer is controlled to perform gas analysis on the gas, and the oxygen content of the gas in the electrolytic tank liquid replacement pipeline is obtained;

[0040] When the oxygen content of the gas in the electrolytic tank liquid replacement pipeline is less than a set oxygen content threshold, an electrolytic tank liquid replacement completion signal is output.

[0041] In the second aspect, the embodiments of the present application provide an automatic liquid replacement control system for an electrolytic tank starting process, comprising: a gas control valve assembly, a liquid filling assembly, a gas-liquid separator, an overflow detection switch 40, a liquid discharge valve, a nitrogen oxygen analyzer, and a controller;

[0042] The gas control valve assembly is arranged on the gas pipeline of the electrolytic tank, and is used to assist the filling of nitrogen into the electrolytic tank and the discharge of gas during the electrolytic tank liquid replacement process;

[0043] The liquid filling assembly is arranged on the liquid filling pipeline of the electrolytic tank, and is used to assist the filling of cathode liquid and anode liquid into the corresponding poles of the electrolytic tank according to pre-set flow parameters;

[0044] The gas-liquid separator is arranged on the outlet hose of the electrolytic tank, and comprises a cathode gas-liquid separator and an anode gas-liquid separator. The cathode gas-liquid separator is used to separate overflow gas and overflow liquid in the cathode outlet hose of the electrolytic tank, and the anode gas-liquid separator is used to separate overflow gas and overflow liquid in the anode outlet hose of the electrolytic tank;

[0045] The overflow detection switch 40 is arranged on the outlet hose of the electrolytic tank, and is used to collect liquid overflow data of each outlet hose;

[0046] The liquid discharge valve is arranged on the liquid discharge pipeline of the gas-liquid separator, and comprises a cathode liquid discharge valve 31 and an anode liquid discharge valve 32. The cathode liquid discharge valve 31 is used to assist the discharge of overflow liquid of the cathode gas-liquid separator into a pre-set cathode liquid discharge tank, and the anode liquid discharge valve 32 is used to assist the discharge of overflow liquid of the anode gas-liquid separator into a pre-set anode liquid discharge tank;

[0047] The nitrogen oxygen analyzer is connected with the gas control valve assembly, and is used to analyze the oxygen content of the gas in the electrolytic tank liquid replacement pipeline;

[0048] The controller is connected with the gas control valve assembly, the liquid filling assembly, the overflow detection switch 40, the liquid discharge valve and the oxygen analyzer in nitrogen respectively, and is used for executing the automatic liquid filling replacement control method of the electrolytic cell starting process.

[0049] Optionally, the gas control valve assembly comprises a chlorine vent valve 11, a hydrogen absorption valve 12, a cathode gas overflow valve 13, an anode gas overflow valve 14, a nitrogen filling valve 15, a nitrogen filling flowmeter 16 and a nitrogen analysis cut-off valve 17.

[0050] The chlorine absorption valve 11 is arranged on the anode gas phase outlet hose of the electrolytic cell.

[0051] The hydrogen vent valve 12 is arranged on the cathode gas phase outlet hose of the electrolytic cell.

[0052] The cathode gas overflow valve 13 is arranged on the gas overflow pipeline of the cathode liquid separator.

[0053] The anode gas overflow valve 14 is arranged on the gas overflow pipeline of the anode liquid separator.

[0054] The nitrogen filling valve 15 and the nitrogen filling flowmeter 16 are both arranged on the nitrogen filling pipeline of the electrolytic cell.

[0055] One end of the nitrogen analysis cut-off valve 17 is communicated with the cathode gas phase outlet hose from the cathode liquid separator to the hydrogen vent valve 12, and the other end of the nitrogen analysis cut-off valve 17 is communicated with the gas inlet of the oxygen analyzer in nitrogen.

[0056] Optionally, the liquid filling assembly comprises a cathode liquid filling valve 21, a cathode liquid flowmeter 22, an anode liquid filling valve 23 and an anode liquid flowmeter 24.

[0057] The cathode liquid filling valve 21 and the cathode liquid flowmeter 22 are both arranged on the cathode liquid filling pipeline of the electrolytic cell.

[0058] The anode liquid filling valve 23 and the anode liquid flowmeter 24 are both arranged on the anode liquid filling pipeline of the electrolytic cell.

[0059] (Three) beneficial effects

[0060] The beneficial effects of the present application are:

[0061] The automatic liquid filling replacement control method of the electrolytic cell starting process provided by the present application adopts the technical scheme of setting flow parameters to automatically control the respective filling of the cathode liquid and the anode liquid into the corresponding pole of the electrolytic cell, so that the key parameter control in the liquid filling replacement process is in the optimal range. Compared with the prior art, the labor intensity of the operator is greatly reduced, and the stability and safety of the electrolytic cell starting are improved.

[0062] Meanwhile, in the process of filling the cathode liquid and the anode liquid, the application adopts the technical solution of dynamically adjusting the filling flow of the cathode liquid according to the liquid phase pressure difference data of the cathode and anode of the electrolytic cell, which reduces the number of repeated adjustments of the control loop of the start-up, and further reduces the risk of damage to the electrolytic cell equipment. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 A flowchart of an automatic liquid filling replacement control method for an electrolytic cell start-up process provided by an embodiment of the application is shown in the figure.

[0064] Figure 2 A partial structure diagram of an automatic liquid filling replacement control system for an electrolytic cell start-up process provided by an embodiment of the application is shown in the figure.

[0065]

Explanation of reference signs

[0066] 11: Chlorine absorption valve; 12: Hydrogen vent valve; 13: Cathode gas overflow valve; 14: Anode gas overflow valve; 15: Nitrogen filling valve; 16: Nitrogen flowmeter; 17: Nitrogen analysis cut-off valve;

[0067] 21: Cathode liquid filling valve; 22: Cathode liquid flowmeter; 23: Anode liquid filling valve; 24: Anode liquid flowmeter;

[0068] 31: Cathode liquid discharge valve; 32: Anode liquid discharge valve;

[0069] 40: Overflow detection switch. DETAILED DESCRIPTION

[0070] In order to better explain the application and facilitate understanding, the application is described in detail below through specific embodiments in combination with the drawings.

[0071] An automatic liquid filling replacement control method for an electrolytic cell start-up process provided by an embodiment of the application includes: first, controlling the filling of a set amount of nitrogen into the electrolytic cell; second, filling the cathode liquid and the anode liquid into the corresponding poles of the electrolytic cell according to preset flow parameters; third, dynamically adjusting the filling flow of the cathode liquid according to the obtained liquid phase pressure difference data of the cathode and anode of the electrolytic cell; fourth, when the anode liquid filling reaches a set time, adjusting the filling flow of the cathode liquid and the anode liquid to a set liquid filling flow, and controlling the pre-set liquid discharge valve to open; fifth, monitoring each outlet hose of the electrolytic cell, and when overflow is detected in a set time period, adjusting the filling flow of the cathode liquid and the anode liquid to zero, and controlling the liquid discharge valve to close; and finally, obtaining the oxygen content data of the gas in the electrolytic cell liquid replacement pipeline, and when it is determined that the oxygen content is less than a set oxygen content threshold, outputting an electrolytic cell liquid replacement completion signal.

[0072] The application provides an automatic liquid replacement control method for an electrolytic tank starting process. The technical scheme of setting a flow parameter to automatically control the cathode liquid and the anode liquid to be filled into the corresponding pole of the electrolytic tank makes the key parameter control optimal range in the liquid replacement process. Compared with the prior art, the labor intensity of the operator is greatly reduced, and the stability and safety of the electrolytic tank starting are improved.

[0073] Meanwhile, in the filling process of the cathode liquid and the anode liquid, the application adopts the technical scheme of dynamically adjusting the filling flow of the cathode liquid according to the liquid phase pressure difference data of the cathode and anode of the electrolytic tank, which reduces the number of repeated control of the starting control loop, and further reduces the damage risk of the electrolytic tank equipment.

[0074] In order to better understand the above technical scheme, the exemplary embodiments of the application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the application are shown in the drawings, it should be understood that the application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer, more thorough understanding of the application and to fully convey the scope of the application to those skilled in the art.

[0075] Specifically, referring to Figure 1 The application provides an automatic liquid replacement control method for an electrolytic tank starting process, which comprises:

[0076] S1, controlling the electrolytic tank to fill a set amount of nitrogen.

[0077] Further, the step S1 comprises:

[0078] S11, controlling the pre-set gas control valve including a hydrogen gas vent valve, a chlorine gas absorption valve, a cathode gas overflow valve, an anode gas overflow valve and a nitrogen filling valve to be opened.

[0079] S12, filling a set amount of nitrogen into the electrolytic tank according to the set gas filling flow of 30 Nm 3 / h~40 Nm 3 / h.

[0080] S2, filling the cathode liquid and the anode liquid into the corresponding pole of the electrolytic tank according to the pre-set flow parameter.

[0081] Further, the step S2 comprises:

[0082] S21, after the gas control valve is opened and the electrolytic tank fills a set amount of nitrogen, the cathode liquid is filled into the cathode of the electrolytic tank according to the set first liquid filling flow, wherein the first liquid filling flow is 13 m 3 / h~16 m 3 / h.

[0083] S22, obtaining liquid-phase pressure difference data of the cathode and anode of the electrolytic cell after the catholyte is filled into the cathode.

[0084] S23, judging whether the liquid-phase pressure difference data reaches the threshold range of 0.2mH2O-0.5mH2O.

[0085] S24, when the liquid-phase pressure difference data reaches the threshold range of 0.2mH2O-0.5mH2O, filling the anolyte into the anode of the electrolytic cell according to the set second filling flow rate, wherein the second filling flow rate is 15m 3 / h-30m 3 / h.

[0086] S3, dynamically adjusting the filling flow rate of the catholyte according to the obtained liquid-phase pressure difference data of the cathode and anode of the electrolytic cell.

[0087] During the liquid replacement process of the cathode and anode of the electrolytic cell, the liquid-phase pressure difference of the cathode and anode of the electrolytic cell needs to be kept in the range of 0.2mH2O-0.5mH2O. When the liquid-phase pressure difference is less than 0.2mH2O, the filling flow rate of the catholyte is adjusted by a first target value; when the liquid-phase pressure difference is greater than 0.5mH2O, the filling flow rate of the catholyte is adjusted to a second target value.

[0088] Further, the step S3 comprises:

[0089] S31, obtaining the liquid-phase pressure difference data of the cathode and anode of the electrolytic cell when the cathode and anode of the electrolytic cell are filled with liquid.

[0090] S32, judging whether the liquid-phase pressure difference data is in the threshold range of 0.2mH2O-0.5mH2O.

[0091] S33a, if the liquid-phase pressure difference data is less than 0.2mH2O, then the filling flow rate of the catholyte is adjusted from 13m 3 / h-16m 3 / h to 17m 3 / h-40m 3 / h.

[0092] S33b, if the liquid-phase pressure difference data is in the threshold range of 0.2mH2O-0.5mH2O, then the existing filling flow rate of the catholyte is maintained.

[0093] S33c, if the liquid-phase pressure difference data is greater than 0.5mH2O, then the filling flow rate of the catholyte is adjusted from 13m 3 / h-16m 3 / h to 8m 3 / h-12m 3 / h.

[0094] S4, when the anolyte filling reaches the set time, the catholyte and anolyte filling flow rates are adjusted to the set filling flow rates, and the pre-set liquid discharge valve is opened.

[0095] Further, step S4 comprises:

[0096] S41, the volume data of the electrolytic cell is obtained.

[0097] S42, based on the volume data of the electrolytic cell, the anolyte filling time required for the electrolytic cell to be filled is calculated. The anolyte filling time required for the electrolytic cell to be filled is between 50 minutes and 60 minutes.

[0098] S43, when the anolyte filling reaches the anolyte filling time required for the electrolytic cell to be filled, the catholyte and anolyte filling flow rates are adjusted to the set third filling flow rates, and the pre-set liquid discharge valve is opened. The third filling flow rates are between 2 m 3 / h and 8 m 3 / h.

[0099] S5, the outlet hoses of the electrolytic cell are monitored, and when overflow is detected in the set time period, the catholyte and anolyte filling flow rates are adjusted to zero, and the liquid discharge valve is closed.

[0100] Further, step S5 comprises:

[0101] S51, based on the obtained overflow monitoring data of each outlet hose of the electrolytic cell, it is determined whether overflow exists in each outlet hose of the electrolytic cell in the set time period. The set time period is between 0 minute and 10 minutes.

[0102] S52a, if one or more outlet hoses of the electrolytic cell do not overflow in the set time period, the catholyte and anolyte filling flow rates are adjusted to zero, and a filling abnormality signal is output.

[0103] S52b, if overflow exists in each outlet hose of the electrolytic cell in the set time period, the catholyte and anolyte filling flow rates are adjusted to zero, and the liquid discharge valve is closed.

[0104] S6, the oxygen content data of the gas in the electrolytic cell filling replacement pipeline is obtained, and when it is determined that the oxygen content is less than the set oxygen content threshold, an electrolytic cell filling replacement completion signal is output.

[0105] Further, step S6 comprises:

[0106] S61, the opening degree of the hydrogen vent valve is adjusted to a set value, and the pre-set nitrogen analysis cut-off valve is opened. The opening degree of the hydrogen vent valve is adjusted to between 10% and 30%.

[0107] S62, when the gas in the electrolytic tank liquid replacement pipeline flows into the pre-set nitrogen oxygen analyzer, control the nitrogen oxygen analyzer to carry out gas analysis on the gas, and obtain the oxygen content data of the gas in the electrolytic tank liquid replacement pipeline.

[0108] S63, when the oxygen content of the gas in the electrolytic tank liquid replacement pipeline is less than the set oxygen content threshold, output the electrolytic tank liquid replacement completion signal.

[0109] In one embodiment, in order to better control the ratio of chlorine and hydrogen, a reasonable calculation formula is obtained by model operation, and the equation is as follows:

[0110]

[0111] In formula (1), e(t)dt is the slope of the deviation curve e(t) from time 0 to time t, and the deviation curve e(t) is the set value curve minus the actual value curve.

[0112] Therefore, the equation is further expressed as:

[0113]

[0114] In formula (2), K is any positive value.

[0115] Further, a PID controller is used to adjust the set value of hydrogen flow to maintain a constant ratio with chlorine flow. The output of the PID controller will be used to adjust the output of the hydrogen flow to eliminate the ratio error. Through the adjustment of the PID controller, the hydrogen flow can be automatically adjusted according to the change of the chlorine flow to maintain a constant ratio between the two. At the same time, in order to better control the rising and falling rate of the valve, the parameters are modified on the basis of the ramp function. The ramp function is a mathematical function whose value increases linearly with time, regardless of the decrease of time. Therefore, the ramp function is usually used to describe the increase or decrease at a constant rate within a certain period of time. The calculation formula of the ramp function is as follows:

[0116] r(t) = a * t * K (3)

[0117] In formula (3), r(t) is the value of the ramp function at time t. a is the slope, which represents the rate of increase of the function value with time. If a>0, the function increases with time; if a<0, the function decreases with time; t is the time variable; when a>0, the ramp function starts from the origin and increases continuously with time, and the growth rate is constant; when a<0, the ramp function decreases from infinity to 0, and the decreasing rate is also constant. K is the modification coefficient, which realizes the flexible modification of the slope and time.

[0118] On the other hand, with reference toFigure 2 The present application also provides an automatic liquid replacement control system for the electrolytic cell starting process, which comprises a gas control valve assembly, a liquid filling assembly, a gas-liquid separator, an overflow detection switch 40, a liquid discharge valve, an oxygen-in-nitrogen analyzer and a controller.

[0119] The gas control valve assembly is arranged on the gas pipeline of the electrolytic cell and is used to assist the filling of nitrogen into the electrolytic cell and the discharge of gas during the liquid replacement process of the electrolytic cell.

[0120] The liquid filling assembly is arranged on the liquid filling pipeline of the electrolytic cell and is used to assist the filling of cathode liquid and anode liquid into the corresponding electrode of the electrolytic cell according to preset flow parameters.

[0121] The gas-liquid separator is arranged on the outlet hose of the electrolytic cell, and the gas-liquid separator comprises a cathode gas-liquid separator and an anode gas-liquid separator. The cathode gas-liquid separator is used to separate the overflow gas and overflow liquid in the cathode outlet hose of the electrolytic cell, and the anode gas-liquid separator is used to separate the overflow gas and overflow liquid in the anode outlet hose of the electrolytic cell.

[0122] The overflow detection switch 40 is arranged on the outlet hose of the electrolytic cell and is used to collect the liquid overflow data of each outlet hose.

[0123] The liquid discharge valve is arranged on the liquid discharge pipeline of the gas-liquid separator, and the liquid discharge valve comprises a cathode liquid discharge valve 31 and an anode liquid discharge valve 32. The cathode liquid discharge valve 31 is used to assist the discharge of the overflow liquid of the cathode gas-liquid separator into a pre-set cathode liquid discharge tank, and the anode liquid discharge valve 32 is used to assist the discharge of the overflow liquid of the cathode gas-liquid separator into a pre-set anode liquid discharge tank.

[0124] The oxygen-in-nitrogen analyzer is connected with the gas control valve assembly and is used to analyze the oxygen content in the gas in the liquid replacement pipeline of the electrolytic cell.

[0125] The controller is connected with the gas control valve assembly, the liquid filling assembly, the overflow detection switch 40, the liquid discharge valve and the oxygen-in-nitrogen analyzer respectively and is used to execute the automatic liquid replacement control method for the electrolytic cell starting process as described above.

[0126] Further, the gas control valve assembly comprises a chlorine absorption valve 11, a hydrogen vent valve 12, a cathode gas overflow valve 13, an anode gas overflow valve 14, a nitrogen filling valve 15, a nitrogen flow meter 16 and a nitrogen analysis cut-off valve 17.

[0127] The chlorine absorption valve 11 is arranged on the anode gas phase outlet pipeline of the electrolytic cell.

[0128] The hydrogen vent valve 12 is arranged on the cathode gas phase outlet pipeline of the electrolytic cell.

[0129] The cathode gas overflow valve 13 is arranged on the gas overflow pipeline of the cathode liquid separator.

[0130] The anode gas overflow valve 14 is arranged on the gas overflow pipeline of the anode liquid separator.

[0131] The nitrogen filling valve 15 and the nitrogen filling flowmeter 16 are arranged on the nitrogen filling pipeline of the electrolytic cell.

[0132] The nitrogen analysis cut-off valve 17 is in communication with the cathode gas phase outlet pipeline from the cathode liquid separator to the hydrogen gas vent valve 12 at one end, and is in communication with the gas inlet of the oxygen-in-nitrogen analyzer at the other end.

[0133] Further, the liquid filling assembly comprises a cathode liquid filling valve 21, a cathode liquid flowmeter 22, an anode liquid filling valve 23 and an anode liquid flowmeter 24.

[0134] The cathode liquid filling valve 21 and the cathode liquid flowmeter 22 are arranged on the cathode liquid filling pipeline of the electrolytic cell.

[0135] The anode liquid filling valve 23 and the anode liquid flowmeter 24 are arranged on the anode liquid filling pipeline of the electrolytic cell.

[0136] In summary, the present application provides an automatic liquid replacement control method and system for the starting process of an electrolytic cell, and the method flow is as follows: first, after the gas control valve is opened and the electrolytic cell is filled with a set amount of nitrogen, the cathode liquid is filled into the cathode of the electrolytic cell at a first liquid filling flow rate; second, according to the liquid phase pressure difference data of the cathode and anode of the electrolytic cell and the cathode liquid filling time data, the anode liquid is filled into the anode of the electrolytic cell at a second liquid filling flow rate; third, when the cathode and anode of the electrolytic cell are both filled with liquid, the filling flow rate of the cathode liquid is dynamically adjusted according to the liquid phase pressure difference data of the cathode and anode of the electrolytic cell; fourth, when the electrolytic cell is filled to a predetermined level, the liquid filling flow rates of the cathode and anode are adjusted to a third liquid filling flow rate, and the liquid discharge valve is controlled to be opened; fifth, when the electrolytic cell has overflow at the set time period in each outlet hose, the liquid filling flow rates of the cathode and anode are adjusted to zero, and the liquid discharge valve is controlled to be closed; and finally, when the oxygen content of the gas is less than a set oxygen content threshold, a signal indicating that the liquid replacement of the electrolytic cell is completed is output. This scheme greatly reduces the labor intensity of the operator and improves the stability and safety of the starting of the electrolytic cell.

[0137] Meanwhile, in the filling process of the cathode liquid and the anode liquid, the present application adopts the technical scheme of dynamically adjusting the filling flow rate of the cathode liquid according to the liquid phase pressure difference data of the cathode and anode of the electrolytic cell, which reduces the number of repeated adjustments of the control loop for starting, and further reduces the risk of damage to the electrolytic cell equipment.

[0138] The system / device used for implementing the method of the embodiments of the present application described above can be understood by those skilled in the art based on the method of the embodiments of the present application described above, and thus will not be described here again. The system / device used for implementing the method of the embodiments of the present application described above all belong to the scope of the present application.

[0139] Those skilled in the art will appreciate that embodiments of the present application can be supplied as a method, a system or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage media, etc.) containing computer-usable program code.

[0140] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system) and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as a combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions.

[0141] It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims, the word "first", "second", "third" etc. does not limit the number for these elements. These words are only used to distinguish between alternative claims. The word "plurality" does not imply a limitation to just two instances of the referenced item.

[0142] Furthermore, it is noted that the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art will recognize that the embodiments or examples described herein can be practiced with a less than all the features or a greater than all the features described herein. Thus, the described features, structures, or characteristics can be combined in one or more embodiments or examples. In addition, those skilled in the art will appreciate that the various embodiments or examples described herein can be implemented in a computer system or article of manufacture using standard programming and / or engineering techniques.

[0143] While the preferred embodiments of the application have been described, those skilled in the art will recognize that many modifications and variations of this preferred embodiment are possible without departing from the spirit or scope of the present application. Thus, it is intended that the present application encompass all such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0144] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. An automatic liquid filling replacement control method for an electrolytic tank start-up process, characterized by, The method comprises the following steps: controlling to fill a set amount of nitrogen into the electrolytic cell; filling catholyte and anolyte into corresponding poles of the electrolytic cell according to preset flow parameters; dynamically adjusting the filling flow of the catholyte according to the obtained liquid-phase pressure difference data of the cathode and anode of the electrolytic cell; when the anolyte filling reaches a set time, adjusting the filling flow of the catholyte and the anolyte to a set liquid filling flow, and controlling the pre-set liquid discharge valve to open; monitoring each outlet hose of the electrolytic cell, and when overflow is detected in a set time period, adjusting the filling flow of the catholyte and the anolyte to zero, and controlling the liquid discharge valve to close; obtaining the oxygen content data of the gas in the electrolytic cell liquid filling replacement pipeline, and when it is determined that the oxygen content is less than a set oxygen content threshold, outputting an electrolytic cell liquid filling replacement completion signal.

2. The automatic liquid filling replacement control method for the starting process of an electrolytic cell according to claim 1, characterized by, The method comprises the following steps: controlling to fill a set amount of nitrogen into the electrolytic cell includes: The set 30 Nm 3 / h ~ 40 Nm 3 The set amount of nitrogen gas is charged to the electrolytic cell at an aeration flow rate of 30 Nm 3. The automatic liquid filling replacement control method for the starting process of an electrolytic cell according to claim 2, characterized by, controlling the pre-set gas control valve including a hydrogen vent valve, a chlorine absorption valve, a cathode gas overflow valve, an anode gas overflow valve, and a nitrogen filling valve to open; After the gas control valve is opened and the electrolytic tank is filled with a set amount of nitrogen, the cathode liquid is filled into the cathode of the electrolytic tank according to a set first liquid filling flow rate, wherein the first liquid filling flow rate is 13m 3 / h~16m 3 / h; filling catholyte and anolyte into corresponding poles of the electrolytic cell according to preset flow parameters includes: after the catholyte is filled into the cathode of the electrolytic cell, obtaining the liquid-phase pressure difference data of the cathode and anode of the electrolytic cell; When the liquid phase pressure difference data reaches the set threshold range of 0.2mH2O-0.5mH2O, the anolyte is filled into the anode of the electrolytic cell according to the set second filling flow rate, wherein the second filling flow rate is 15m 3 / h-30m 3 / h.

4. The automatic liquid filling replacement control method for the starting process of an electrolytic cell according to claim 3, characterized by, determining whether the liquid-phase pressure difference data reaches a set threshold range of 0.2mH2O-0.5mH2O; dynamically adjusting the filling flow of the catholyte according to the obtained liquid-phase pressure difference data of the cathode and anode of the electrolytic cell includes: when the cathode and anode of the electrolytic cell are both filled with liquid, obtaining the liquid-phase pressure difference data of the cathode and anode of the electrolytic cell; If the liquid phase pressure difference data is less than 0.2 mH2O, then control the cathode liquid fill flow from 13 m 3 / h to 16 m 3 / h to 17 m 3 / h to 40 m 3 / h; determining whether the liquid-phase pressure difference data is within a set threshold range of 0.2mH2O-0.5mH2O; If the liquid phase pressure difference data is greater than 0.5 mH2O, then control the cathode liquid fill flow from 13 m 3 / h to 16 m 3 / h to 8 m 3 / h to 12 m 3 / h.

5. The method of claim 1, wherein the method is characterized by: if the liquid-phase pressure difference data is within the set threshold range of 0.2mH2O-0.5mH2O, maintaining the existing catholyte filling flow; when the anolyte filling reaches a set time, adjusting the filling flow of the catholyte and the anolyte to a set liquid filling flow, and controlling the pre-set liquid discharge valve to open includes: obtaining the volume data of the electrolytic cell; When the anolyte filling time required to fill the electrolytic cell to the point of being full is reached, the catholyte filling flow rate and the anolyte filling flow rate are adjusted to a set third liquid filling flow rate, and a pre-set liquid discharge valve is opened, wherein the third liquid filling flow rate is 2 m 3 / h ~ 8 m 3 / h.

6. The method of claim 1, wherein the method further comprises: determining a target level of electrolyte in the electrolysis cell; and adjusting the flow rate of the electrolyte to the electrolysis cell to maintain the target level of electrolyte in the electrolysis cell. based on the volume data of the electrolytic cell, calculating the anolyte filling time required when the electrolytic cell is filled; monitoring each outlet hose of the electrolytic cell, and when overflow is detected in a set time period, adjusting the filling flow of the catholyte and the anolyte to zero, and controlling the liquid discharge valve to close includes: based on the obtained overflow monitoring data of each outlet hose of the electrolytic cell, determining whether overflow exists in each outlet hose of the electrolytic cell in a set time period; if one or more outlet hoses of the electrolytic cell do not have overflow in the set time period, adjusting the catholyte filling flow and the anolyte filling flow to zero, and outputting a liquid filling abnormal signal; 7. The automatic liquid filling and displacement control method for the start-up process of an electrolytic cell as described in claim 2, characterized in that, if each outlet hose of the electrolytic cell has overflow in the set time period, adjusting the catholyte filling flow and the anolyte filling flow to zero, and controlling the liquid discharge valve to close. obtaining the oxygen content data of the gas in the electrolytic cell liquid filling replacement pipeline, and when it is determined that the oxygen content is less than a set oxygen content threshold, outputting an electrolytic cell liquid filling replacement completion signal includes: controlling the opening degree of the hydrogen vent valve to a set value and controlling the pre-set nitrogen analysis cut-off valve to open; When the gas in the electrolytic cell liquid replacement pipeline flows into the pre-set nitrogen oxygen analyzer, the nitrogen oxygen analyzer controls the gas analysis of the gas to obtain the oxygen content data of the gas in the electrolytic cell liquid replacement pipeline; When the oxygen content of the gas in the electrolytic cell liquid replacement pipeline is less than the set oxygen content threshold, an electrolytic cell liquid replacement completion signal is output.

8. An automatic liquid filling replacement control system for a cell start-up process, characterized by, It comprises: a gas control valve assembly, a liquid filling assembly, a gas-liquid separator, an overflow detection switch (40), a liquid discharge valve, a nitrogen oxygen analyzer, and a controller; The gas control valve assembly is arranged on the gas pipeline of the electrolytic cell, and is used to assist the filling of nitrogen into the electrolytic cell and the discharge of gas during the liquid replacement process of the electrolytic cell; The liquid filling assembly is arranged on the liquid filling pipeline of the electrolytic cell, and is used to assist the filling of cathode liquid and anode liquid into the corresponding electrode of the electrolytic cell according to the preset flow parameters; The gas-liquid separator is arranged on the outlet hose of the electrolytic cell, and comprises a cathode gas-liquid separator and an anode gas-liquid separator, the cathode gas-liquid separator is used to separate the overflow gas and overflow liquid in the cathode outlet hose of the electrolytic cell, and the anode gas-liquid separator is used to separate the overflow gas and overflow liquid in the anode outlet hose of the electrolytic cell; The overflow detection switch (40) is arranged on the outlet hose of the electrolytic cell, and is used to collect the liquid overflow data of each outlet hose; The liquid discharge valve is arranged on the liquid discharge pipeline of the gas-liquid separator, and comprises a cathode liquid discharge valve (31) and an anode liquid discharge valve (32), the cathode liquid discharge valve (31) is used to assist the overflow liquid of the cathode gas-liquid separator to be discharged into the pre-set cathode liquid discharge tank, and the anode liquid discharge valve (32) is used to assist the overflow liquid of the anode gas-liquid separator to be discharged into the pre-set anode liquid discharge tank; The nitrogen oxygen analyzer is connected with the gas control valve assembly, and is used to analyze the oxygen content of the gas in the electrolytic cell liquid replacement pipeline; The controller is connected with the gas control valve assembly, the liquid filling assembly, the overflow detection switch (40), the liquid discharge valve, and the nitrogen oxygen analyzer, and is used to execute the automatic liquid replacement control method of the electrolytic cell starting process as claimed in any one of claims 1-7.

9. An automatic filling replacement control system for a cell start-up process according to claim 8, wherein The gas control valve assembly comprises a chlorine gas vent valve (11), a hydrogen gas absorption valve (12), a cathode gas overflow valve (13), an anode gas overflow valve (14), a nitrogen filling valve (15), a nitrogen filling flowmeter (16), and a nitrogen gas analysis cut-off valve (17); The chlorine gas absorption valve (11) is arranged on the anode gas phase outlet pipeline of the electrolytic cell; The hydrogen gas vent valve (12) is arranged on the cathode gas phase outlet pipeline of the electrolytic cell; The cathode gas overflow valve (13) is arranged on the gas overflow pipeline of the cathode liquid separator; The anode gas overflow valve (14) is arranged on the gas overflow pipeline of the anode liquid separator; The nitrogen filling valve (15) and the nitrogen filling flowmeter (16) are both arranged on the nitrogen filling pipeline of the electrolytic cell; The nitrogen analysis cut-off valve (17) is in communication with the cathode liquid separator at one end and the cathode gas phase outlet pipeline to the hydrogen vent valve (12) at the other end, and is in communication with the gas inlet of the oxygen-in-nitrogen analyzer.

10. An automatic liquid filling replacement control system for a cell start-up process according to claim 8, wherein The liquid filling assembly comprises a cathode liquid filling valve (21), a cathode liquid flowmeter (22), an anode liquid filling valve (23) and an anode liquid flowmeter (24); The cathode liquid filling valve (21) and the cathode liquid flowmeter (22) are arranged on the cathode liquid filling pipeline of the electrolytic tank; The anode liquid filling valve (23) and the anode liquid flowmeter (24) are arranged on the anode liquid filling pipeline of the electrolytic tank.

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