CN112048739B - Safety early warning method and safety early warning system for aluminum electrolysis cell - Google Patents
Safety early warning method and safety early warning system for aluminum electrolysis cell Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 84
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 30
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 67
- 230000001174 ascending effect Effects 0.000 claims abstract description 60
- 238000001931 thermography Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 75
- 239000010959 steel Substances 0.000 claims description 75
- 230000000630 rising effect Effects 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 8
- 239000003792 electrolyte Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000001932 seasonal effect Effects 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 14
- 230000007246 mechanism Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000003745 diagnosis Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910000754 Wrought iron Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011081 inoculation Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
- C25C3/20—Automatic control or regulation of cells
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- Electrolytic Production Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a safety early warning method for an aluminum electrolytic cell, which comprises the following steps: determining more than one type of temperature measurement area on the aluminum electrolysis cell, determining more than two location identifications on each type of temperature measurement area, and determining corresponding identification areas according to the location identifications; carrying out infrared thermal imaging photographing on each type of temperature measurement area to obtain temperature distribution data of the temperature measurement area; judging whether an overtemperature point exceeding the temperature upper limit threshold of the corresponding region exists in each temperature measuring region; if yes, outputting safety alarm information; judging whether the temperature of each identification area at the current moment is in an ascending trend and exceeds an ascending threshold value compared with the temperature before the current moment and within a preset time period; if so, outputting safety early warning information; judging whether the temperature deviation between each identification area and the adjacent identification area exceeds a deviation threshold value or not; if so, outputting safety reminding information; the scheme can effectively prevent the leakage of the electrolytic cell and is beneficial to the safe and stable production of the electrolytic cell.
Description
Technical Field
The application relates to the technical field of electrolytic aluminum, in particular to a safety early warning method and a safety early warning system for an aluminum electrolytic cell.
Background
The production process of electrolytic aluminum comprises the steps of dissolving aluminum oxide in a 920-960 ℃ molten electrolyte in an electrolytic bath, and carrying out electrolytic reduction reaction on a carbon anode and the aluminum oxide on two electrodes by strong direct current to generate primary aluminum liquid and CO2And (3) gas processing. Because of the electrochemical production process of high current, strong magnetic field, high temperature and high corrosion in the electrolytic aluminum process, the safety of the electrolytic cell is always the key problem needing attention in the aluminum electrolysis production process, and particularly the problem of the leakage of the electrolytic cell belongs to very important safetyTherefore, the service life of the tank is shortened, the cost of enterprises is increased, and even the great life and property losses of the enterprises such as series power failure, series tank shutdown, fire, employee casualties and the like are caused. Therefore, ensuring the safe production operation of the electrolytic cell is the most important work in the production process of the electrolysis enterprises.
In order to prevent the risk of furnace leakage of the electrolytic cell, the enterprise takes measures of arranging measuring personnel to regularly carry out single-point measurement on the temperature of a cell bottom plate, the temperature of a side wall and the temperature of a steel bar of the electrolytic cell, and the temperature measurement mode comprises manual temperature measurement or development of an intelligent temperature measuring device to realize automatic temperature measurement. However, when diagnosing whether the aluminum electrolysis cell has the furnace leakage risk, the judgment is performed unilaterally only from whether the measured temperature is higher than the alarm temperature, and at this time, the furnace leakage risk is very high, so that the safety early warning cannot be provided in the early stage of the generation and development of the furnace leakage risk, the equipment maintenance is delayed, the furnace leakage cannot be avoided in time, the safety production of the aluminum electrolysis cell is not facilitated, and the normal production rhythm of the aluminum electrolysis process is also influenced.
Disclosure of Invention
The invention provides a safety early warning method and a safety early warning system for an aluminum electrolytic cell, which aim to solve or partially solve the technical problems that the conventional aluminum electrolytic cell lacks a perfect risk early warning mechanism, cannot timely analyze the furnace leakage risk of the aluminum electrolytic cell and can not provide early warning.
In order to solve the technical problem, the invention provides a safety early warning method for an aluminum electrolysis cell, which comprises the following steps:
a safety early warning method for an aluminum electrolysis cell comprises the following steps:
determining at least one type of temperature measurement area on the aluminum electrolysis cell, respectively determining more than two location identifications on each type of temperature measurement area, and respectively determining corresponding identification areas according to the location identifications; the temperature measuring area comprises a furnace bottom area, a side wall area and a steel bar area;
according to a preset frequency, performing infrared thermal imaging photographing on each type of temperature measuring area respectively to obtain temperature distribution data of the temperature measuring areas including corresponding identification areas;
judging whether the highest temperature value in each temperature measurement area exceeds the temperature upper limit threshold of the corresponding temperature measurement area; if the maximum temperature value exceeds the temperature upper limit threshold of the corresponding identification area, determining all over-temperature points of which the temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, recording the positions, the identification areas and the temperature values of the over-temperature points, counting the over-temperature areas of the over-temperature points, and outputting safety alarm information;
judging whether the temperature of each identification area at the current moment is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value compared with the temperature of each identification area within a preset time period before the current moment; if the value of the rising trend exceeds a rising threshold value, outputting safety early warning information corresponding to the identification area;
judging whether the temperature deviation between the two steel bars of each cathode exceeds a steel bar temperature difference threshold value or not, and if the temperature deviation between the two steel bars exceeds the steel bar temperature difference threshold value, outputting safety early warning information corresponding to the identification area;
judging whether the temperature deviation between each identification area and the adjacent identification area exceeds an identification area temperature difference threshold value or not; and if the temperature deviation between the identification area and the adjacent identification area exceeds the temperature difference threshold value of the identification area, outputting safety reminding information corresponding to the identification area.
Optionally, more than two location identifiers are respectively determined on each type of temperature measurement area, and corresponding identifier areas are respectively determined according to the location identifiers, specifically including:
for the furnace bottom area, in the Y direction of the aluminum electrolytic cell, furnace bottom position identification is determined by 1/4 outside the surface A of the cathode carbon block of the cell bottom plate, 1/4 inside the surface A, 1/4 outside the surface B and 1/4 step length inside the surface B; determining a furnace bottom identification area based on furnace bottom zone bit identification according to the serial number of cathode groups by taking cathode carbon blocks as intervals in the X direction of the aluminum electrolytic cell;
for the side wall A surface and the side wall B surface of the side wall area, determining a side wall zone bit identifier and a side wall identifier area according to the number of cathode groups in the X direction and the carbon block area and the melt area in the Z direction; wherein the melt zone comprises an aluminum liquid zone and an electrolyte zone.
And for the steel bar area, determining the steel bar zone bit identification and the steel bar identification area according to the cathode group number and the cathode steel bar number.
Further, infrared thermal imaging photographing is respectively carried out on each type of temperature measuring area, temperature distribution data of the temperature measuring areas including corresponding identification areas are obtained, and the method specifically comprises the following steps:
respectively shooting 1-N infrared temperature images for each type of temperature measurement area, wherein N is the number of cathode groups;
and respectively summarizing and de-duplicating all infrared temperature images of each type of temperature measurement area to obtain temperature distribution data of each type of temperature measurement area comprising the corresponding identification area.
According to the technical scheme, the temperature upper limit threshold and the preset frequency in each temperature measuring area are determined according to the tank type, the tank condition, the current level, the current parameter and the time period of the electrolytic tank; wherein, the preset frequency is the polling frequency.
According to the technical scheme, the temperature upper limit threshold is a point temperature upper limit threshold corresponding to the temperature measuring area;
determining overtemperature points of which all temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, and specifically comprising the following steps:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the temperature measuring area to which the position point belongs; if so, the position point is confirmed as the over-temperature point.
According to the technical scheme, the temperature upper limit threshold is a temperature upper limit threshold curve, and the temperature upper limit threshold curve comprises point temperature upper limit thresholds of all identification areas in the temperature measurement area;
determining overtemperature points of which all temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, and specifically comprising the following steps:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the identification area to which the position point belongs; if so, the position point is confirmed as the over-temperature point.
Optionally, the point temperature upper threshold or the temperature upper threshold curve is divided according to three standards of winter, summer, spring and autumn according to the seasonal air temperature of the location of the aluminum electrolytic cell.
According to the above technical solution, determining whether the temperature of each identification area at the current time is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value when compared with the temperature of each identification area within a preset time period before the current time specifically includes:
determining a rise threshold for each identified region;
judging whether the highest temperature of each identification area at the current moment is in an ascending trend or not compared with the highest temperature of each identification area before the current moment and within a preset time period, and whether the value of the ascending trend exceeds an ascending threshold or not;
and if the identification area with the ascending trend value exceeding the ascending threshold value exists, outputting the safety early warning information corresponding to the identification area.
According to the above technical solution, determining whether the temperature of each identification area at the current time is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value when compared with the temperature of each identification area within a preset time period before the current time specifically includes:
determining a point rising threshold value of each position point in each identification area;
judging whether the temperature of each position point in each identification area at the current moment is in an ascending trend compared with the temperature of each position point in each identification area before the current moment and within a preset time period, and whether the value of the ascending trend exceeds a point ascending threshold of the corresponding position point;
and if the position point with the ascending trend value exceeding the corresponding point ascending threshold value exists, outputting the safety early warning information of the identification area corresponding to the position point.
According to the technical scheme, the temperature upper limit threshold is a temperature upper limit threshold curve, and the temperature upper limit threshold curve comprises point temperature upper limit thresholds of all identification areas in the temperature measurement area;
judging whether the temperature deviation between each identification area and the adjacent identification area exceeds an identification area temperature difference threshold value, and the method specifically comprises the following steps:
judging whether the maximum value of the temperature deviation between each position point in the identification area and each position point in the adjacent identification area exceeds an identification area temperature difference threshold value or not; the identification area temperature difference threshold is the temperature difference gradient between the identification area and the adjacent identification area determined according to the temperature upper limit threshold curve.
According to the technical scheme, the safety early warning method further comprises the following steps:
when safety alarm information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once every shift to once every two hours;
when the safety early warning information or the safety reminding information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once a day;
when the iron and silicon content is increased, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once a day.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a safety early warning method, which comprises the steps of carrying out zone bit identification on at least one type of temperature measuring areas in a furnace bottom area, a side wall area and a steel bar area of an aluminum electrolytic cell, and dividing identification areas; then obtaining temperature distribution data of the temperature measurement area through infrared thermal imaging; then, four early warning mechanisms are designed: for the condition that the temperature of the identification area exceeds the limit, performing furnace leakage risk alarm with the highest grade to prompt that the furnace leakage risk is required to be processed immediately; for the condition that the temperature rising trend of a certain identification area exceeds a rising threshold value, carrying out second-level potential furnace leakage risk early warning, and timely checking potential areas which are possibly developed into furnace leakage risks; similarly, the judgment is carried out according to the temperature deviation between the cathode steel bars, so as to check the potential furnace leakage risk of the steel bars as early as possible; and (4) carrying out third-level safety reminding on the condition that the adjacent identification areas are compared with the identification areas with abnormal temperature deviation, and finding out the abnormal temperature areas as early as possible to prevent the risk of furnace leakage in the bud. By combining the three-level early warning mechanisms for correspondingly warning, early warning and reminding the four temperature abnormal conditions, a set of more perfect and refined aluminum electrolytic cell furnace leakage risk warning and early risk early warning scheme is established, the ambient temperature of the aluminum electrolytic cell and the furnace leakage early warning are provided for production personnel in advance, diagnosis can be timely intervened in the early stage of the furnace leakage risk occurrence or the furnace leakage risk inoculation according to the warning, early warning and reminding information, the occurrence of furnace leakage accidents is effectively prevented, and the safe and stable production of the electrolytic cell is ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a schematic flow diagram of a safety precaution method for an aluminum electrolysis cell according to one embodiment of the invention;
FIG. 2 shows a schematic diagram of determining a location identity of a hearth region of an aluminum reduction cell according to one embodiment of the present invention;
FIG. 3 shows a schematic diagram of determining location identity of side wall regions of an aluminum electrolysis cell according to one embodiment of the present invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
In order to realize the diagnosis of the leakage of the aluminum electrolysis cell and the early warning analysis of the leakage risk and ensure the safe operation of the aluminum electrolysis cell, in an optional embodiment, as shown in fig. 1, a safety warning method for the aluminum electrolysis cell is provided, and the overall idea is as follows:
s1: determining at least one type of temperature measurement area on the aluminum electrolysis cell, respectively determining more than two location identifications on each type of temperature measurement area, and respectively determining corresponding identification areas according to the location identifications; the temperature measuring area comprises a furnace bottom area, a side wall area and a steel bar area;
specifically, the zone bit identifier is a reference point for zone bit division of the temperature measuring area of the aluminum electrolytic cell. An alternative location identity determination scheme is as follows:
for the furnace bottom area, in the Y direction of the aluminum electrolytic cell, furnace bottom position identification is determined by 1/4 outside the surface A of the cathode carbon block of the cell bottom plate, 1/4 inside the surface A, 1/4 outside the surface B and 1/4 step length inside the surface B; determining a furnace bottom identification area based on furnace bottom zone bit identification according to the serial number of cathode groups by taking cathode carbon blocks as intervals in the X direction of the aluminum electrolytic cell;
for the side wall A surface and the side wall B surface of the side wall area, determining a side wall zone bit identifier and a side wall identifier area according to the number of cathode groups in the X direction and the carbon block area and the melt area in the Z direction; wherein the melt zone comprises an aluminum liquid zone and an electrolyte zone.
And for the steel bar area, determining the steel bar zone bit identification and the steel bar identification area according to the cathode group number and the cathode steel bar number.
S2: according to a preset frequency, performing infrared thermal imaging photographing on each type of temperature measuring area respectively to obtain temperature distribution data of the temperature measuring areas including corresponding identification areas;
specifically, when infrared thermal imaging shoots, can adopt to patrol and examine the robot and carry out automatic shoot or adopt the infrared camera probe manual work of dress on the probe arm to shoot as required, can be according to the precision of shooing, but coverage, measuring space restriction and electrolysis trough size definite shooting parameter and the quantity of shooing to the temperature measurement area of difference. The preset frequency refers to the temperature acquisition frequency or the normal inspection frequency, the inspection frequency can be determined according to actual needs, such as once per week or twice per week, and then acquisition is carried out during periodic temperature inspection, and acquisition can also be carried out in other time periods as required.
Optionally, the infrared thermal imaging photographing is performed on each type of temperature measurement area respectively, so as to obtain temperature distribution data of the temperature measurement area including the corresponding identification area, and the method specifically includes:
respectively shooting 1-N infrared temperature images for each type of temperature measurement area, wherein N is the number of cathode groups; and respectively summarizing and de-duplicating all infrared temperature images of each type of temperature measurement area to obtain temperature distribution data of each type of temperature measurement area comprising the corresponding identification area.
When infrared temperature images are collected, for each temperature measurement area, temperature data in a plurality of pictures can be merged and deduplicated according to location identification, the infrared picture of each area is generated, a shielded part of the position (such as a shielding position of a steel beam on the furnace bottom) is removed, then one furnace bottom is obtained, a side wall is divided into A, B surfaces, a flue end and an aluminum outlet end, a steel bar is divided into A, B surfaces of two temperature collection images, and each temperature collection image records temperature distribution information of each position.
The temperature information of all temperature measuring areas is collected, and then the temperature distribution data of the full electrolysis bath comprising the furnace bottom, the side wall and the steel bar can be generated. After the temperature distribution data of each temperature measurement area is obtained, the following judgment steps can be performed:
s3: judging whether the highest temperature value in each temperature measurement area exceeds the temperature upper limit threshold of the corresponding temperature measurement area; if the maximum temperature value exceeds the temperature upper limit threshold of the corresponding identification area, determining all over-temperature points of which the temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, recording the positions, the identification areas and the temperature values of the over-temperature points, counting the over-temperature areas of the over-temperature points, and outputting safety alarm information;
specifically, firstly, according to temperature distribution data, whether the highest temperature point/value in each temperature measurement area exceeds a temperature high limit threshold is judged, and if the highest temperature value exceeds the temperature high limit threshold, all the rest position points are checked to see whether the highest temperature point/value exceeds the temperature high limit threshold; if the highest temperature value does not exceed the temperature upper limit threshold, the overall temperature is normal, and whether the temperatures of other position points exceed the limits is not judged.
Optionally, determining a temperature upper limit threshold and a preset frequency in each temperature measuring area according to the tank type, the tank condition, the current level, the current parameter and the time period of the electrolytic tank; wherein, the preset frequency is the polling frequency. Therefore, the temperature upper limit threshold and the preset frequency (inspection frequency) are not particularly limited and are determined according to the working condition of the actual electrolytic cell. According to the process requirement, the temperature upper limit threshold can be a point temperature upper limit threshold corresponding to a type of temperature measurement area set according to each type of temperature measurement area of the furnace bottom, the side wall and the steel bar; or a temperature upper limit threshold curve related to each identification area in each type of temperature measurement area, and the respective corresponding judgment method is as follows:
optionally, the temperature upper limit threshold is a point temperature upper limit threshold corresponding to the temperature measurement area;
determining overtemperature points of which all temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, and specifically comprising the following steps:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the temperature measuring area to which the position point belongs; if so, the position point is confirmed as the over-temperature point.
When the temperature upper limit threshold is a temperature upper limit threshold curve in one type of temperature measurement area, optionally, the temperature upper limit threshold is a temperature upper limit threshold curve, and the temperature upper limit threshold curve includes point temperature upper limit thresholds of each identification area in the temperature measurement area;
determining overtemperature points of which all temperatures exceed the temperature upper limit threshold of the corresponding temperature measuring area from all position points of the temperature measuring area, and specifically comprising the following steps:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the identification area to which the position point belongs; if so, the position point is confirmed as the over-temperature point.
Namely, when the position point with the highest temperature is determined to be the overtemperature position point, comparing the temperatures of all the position points; during comparison, the identification area to which each position point belongs needs to be judged, and then a point temperature upper limit threshold corresponding to the identification area is determined from the temperature upper limit threshold curve; and recording the identification area information of the overtemperature point, the overtemperature position point information, the specific temperature of the overtemperature position point and the occupied area of the overtemperature point, and carrying out safety alarm prompt based on the information. When the overtemperature position point exceeding the temperature upper limit threshold value appears, the aluminum electrolytic cell has higher furnace leakage risk or the furnace leakage risk is already appeared, and safety alarm information is sent out.
Optionally, the point temperature upper threshold or the temperature upper threshold curve is divided according to three standards of winter, summer, spring and autumn according to the seasonal air temperature of the location of the aluminum electrolytic cell. Optionally, the difference between the standard of the high limit threshold of the winter temperature, the standard of the high limit threshold of the spring and autumn temperature and the standard of the high limit threshold of the summer temperature is sequentially increased by 5-20 ℃. The temperature upper limit threshold value is dynamically adjusted in consideration of the change of the local seasonal air temperature, so that the accuracy of the furnace leakage safety alarm of the aluminum electrolytic cell can be improved.
Also, a temperature trend judgment is performed in synchronization with the over-temperature judgment, namely:
s4: judging whether the temperature of each identification area at the current moment is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value compared with the temperature of each identification area within a preset time period before the current moment; if the value of the rising trend exceeds a rising threshold value, outputting safety early warning information corresponding to the identification area;
the temperature rising trend of the identification area is judged in S4, the furnace leakage risk corresponding to the temperature rising trend exceeding the standard is weaker than the temperature value exceeding the high limit value, so that safety early warning information is output, and an operator is reminded of the potential furnace leakage risk.
Optionally, the value range of the rising threshold is 5-10 ℃, for example, when the temperature of a certain identification area is compared with the temperature data acquired in the previous three days, a rising trend exists, and the rising temperature exceeds 5-10 ℃, safety warning is performed.
The rising threshold may be a highest value corresponding to one identification region, or may be a rising threshold corresponding to different identification regions:
when the ascending threshold is a highest value corresponding to one of the identification areas, optionally, it is determined whether the temperature of each identification area at the current time is in an ascending trend and the value of the ascending trend exceeds the ascending threshold when the temperature of each identification area at the current time is compared with the temperature of each identification area within a preset time period before the current time, and the method specifically includes:
determining a rise threshold for each identified region;
judging whether the highest temperature of each identification area at the current moment is in an ascending trend or not compared with the highest temperature of each identification area before the current moment and within a preset time period, and whether the value of the ascending trend exceeds an ascending threshold or not;
and if the identification area with the ascending trend value exceeding the ascending threshold value exists, outputting the safety early warning information corresponding to the identification area.
In the scheme, the highest temperature point is used for representing the temperature state of one identification area, then the identification area is judged within a preset time period before the current moment, multiple temperature sampling is carried out to obtain whether the highest temperature is in a rising trend and exceeds a rising threshold value, and if the highest temperature exceeds the rising threshold value, safety early warning is sent out.
The method comprises the step of comparing the highest temperature data in each identification area acquired at the current moment with the highest temperature data acquired several times before to determine whether an ascending trend exists or not, namely whether the temperature change trend is an ascending trend or not is traced forwards, and the ascending trend indicates that the temperature in the current identification area gradually rises. Practice shows that after new temperature data are collected each time, the new temperature data are compared with historical temperature data collected for a plurality of times before to calculate the change trend, and compared with other temperature trend calculation schemes, the potential position area where furnace leakage is likely to occur can be predicted more accurately, so that the new temperature data can intervene earlier to be processed before furnace leakage.
One more accurate solution is: judging whether the temperature of each identification area at the current moment is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value or not compared with the temperature of each identification area within a preset time period before the current moment, specifically comprising:
determining a point rising threshold value of each position point in each identification area;
judging whether the temperature of each position point in each identification area at the current moment is in an ascending trend compared with the temperature of each position point in each identification area before the current moment and within a preset time period, and whether the value of the ascending trend exceeds a point ascending threshold of the corresponding position point;
and if the position point with the ascending trend value exceeding the corresponding point ascending threshold value exists, outputting the safety early warning information of the identification area corresponding to the position point.
Namely, each position point is provided with a point rising threshold, all the position points are judged according to the temperature rising trend, and the safety early warning information is detailed to specific position points. The method has larger calculation amount, but the judgment result can be refined to the position point, so that the method is more accurate.
Also carried out in synchronism with S3, S4 are the temperature comparison judgments between the two steel bars of each cathode, namely:
s5: judging whether the temperature deviation between the two steel bars of each cathode exceeds a steel bar temperature difference threshold value or not, and if the temperature deviation between the two steel bars exceeds the steel bar temperature difference threshold value, outputting safety early warning information corresponding to the identification area;
the steel bar temperature difference judgment is to determine whether potential furnace leakage risk exists at the cathode steel bar, and when the temperature deviation between the two steel bars is large, safety early warning information representing the abnormal temperature difference of the steel bar area is sent out.
And (3) carrying out temperature comparison judgment of adjacent marking areas synchronously with S3-S5, namely:
s6: judging whether the temperature deviation between each identification area and the adjacent identification area exceeds an identification area temperature difference threshold value or not; and if the temperature deviation between the identification area and the adjacent identification area exceeds the temperature difference threshold value of the identification area, outputting safety reminding information corresponding to the identification area.
Specifically, S6 is to compare and analyze the temperature of each identification area in each temperature measurement area with the temperature of an adjacent identification area, determine whether there is an obvious difference in the temperature of a certain identification area, and if so, perform a safety prompt. Optionally, the deviation threshold is determined according to the specific working condition of the aluminum electrolysis cell, and may be, for example, more than 10-20 ℃ above the adjacent marked area.
A method for judging the temperature difference threshold value of adjacent identification areas comprises the following steps: the temperature upper limit threshold is a temperature upper limit threshold curve which comprises point temperature upper limit thresholds of all identification areas in the temperature measurement area;
judging whether the temperature deviation between each identification area and the adjacent identification area exceeds an identification area temperature difference threshold value, and the method specifically comprises the following steps:
judging whether the maximum value of the temperature deviation between each position point in the identification area and each position point in the adjacent identification area exceeds an identification area temperature difference threshold value or not; the identification area temperature difference threshold is the temperature difference gradient between the identification area and the adjacent identification area determined according to the temperature upper limit threshold curve.
That is, the temperature difference gradient in the method is the difference between the point temperature upper limit thresholds between the identification areas determined according to the temperature upper limit threshold curve, and the logic of judgment is whether the maximum temperature deviation between the position points of the adjacent identification areas exceeds the temperature difference gradient between the corresponding identification areas, if so, it indicates that the corresponding identification areas have possible furnace leakage risk, and safety warning should be performed.
The reason why the identification area with abnormal temperature difference is found through comparison is that the temperature of the identification area obviously exceeds the surrounding area even though the temperature of all the positions of the identification area is within the temperature upper limit threshold and the rising threshold is not found in the previous temperature acquisition for several times; if the temperature of a certain position is obviously different from that of an adjacent region, the marked region is in the early stage of structural damage of the aluminum electrolytic cell. Production tracking shows that if the temperature of a certain position is obviously higher than that of an adjacent position and the position is not processed, the position is possibly developed into a furnace leakage risk area in a future period of time, so that safety reminding is carried out on the condition that the temperature difference of the identification area obviously exceeding the adjacent temperature or the temperature difference between two identification areas exceeds the temperature difference gradient between the identification areas determined in the temperature upper limit threshold curve, and furnace leakage can be well prevented in the bud.
According to the above judgment result, different routing inspection frequencies can be set according to different types of electrolytic cells, but when the temperature is abnormal, differential adjustment needs to be performed according to different safety alarm types, and optionally, the safety early warning method further comprises the following steps:
when safety alarm information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once every shift to once every two hours;
when the safety early warning information or the safety reminding information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once a day;
when the iron and silicon content is increased, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once a day.
For example, the polling frequency of the aluminum electrolysis cell with normal temperature can be once a week, that is, the preset frequency of temperature data acquisition is once a week; when safety alarm information appears, the inspection frequency is increased from once a week to once every shift to once every two hours; if the safety early warning occurs, the inspection frequency is increased from once a week to once a day.
The embodiment provides a safety early warning method, zone bit identification is carried out on at least one type of temperature measuring areas in a furnace bottom area, a side wall area and a steel bar area of an aluminum electrolytic cell, and identification areas are divided; then obtaining temperature distribution data of the temperature measurement area through infrared thermal imaging; then, a mechanism for performing corresponding early warning for the following situations is designed:
for the condition that the temperature of the identification area exceeds the limit, performing furnace leakage risk alarm with the highest grade to prompt that the furnace leakage risk is required to be processed immediately; wherein, the temperature overrun of the marked area comprises two conditions: whether the temperature of the position point exceeds a point temperature upper limit threshold of the temperature measuring area; or whether the location point temperature exceeds a temperature ceiling threshold curve associated with the identified region;
for the condition that the temperature rising trend of a certain identification area exceeds a rising threshold value, carrying out second-level potential furnace leakage risk early warning, and timely checking potential areas which are possibly developed into furnace leakage risks; similarly, the judgment is carried out according to the temperature deviation between the cathode steel bars, so as to check the potential furnace leakage risk of the steel bars as early as possible;
and (4) carrying out third-level safety reminding on the condition that the adjacent identification areas are compared with the identification areas with abnormal temperature deviation, and finding out the abnormal temperature areas as early as possible to prevent the risk of furnace leakage in the bud.
Through the combination of three-level early warning mechanisms for correspondingly alarming, early warning and reminding aiming at the five temperature abnormal conditions, a set of more perfect and refined aluminum electrolytic cell furnace leakage risk alarming and early risk early warning scheme is established, the temperature around the aluminum electrolytic cell and the furnace leakage early warning are provided for production personnel in advance, diagnosis can be timely intervened at the early stage of the occurrence of the furnace leakage risk or the inoculation of the furnace leakage risk according to alarming, early warning and reminding information, the occurrence of furnace leakage accidents is effectively prevented, and the safe and stable production of the electrolytic cell is ensured.
The following describes the above scheme in detail with reference to specific implementation data:
example 1:
(1) the position of the bottom, the side wall and the steel bar of the electrolytic cell is marked with zone bit (as shown in figures 2 to 3)
For the cell bottom plate, the cell bottom plate is divided into an A surface outer part (1/4), an A surface inner part (1/4), a B surface outer part (1/4) and a B surface inner part (1/4) of the carbon block according to the cathode carbon blocks in the Y direction of the electrolytic cell, the carbon block is partitioned at intervals in the X direction of the electrolytic cell and numbered according to the cathode groups, and the cathode steel bars are subjected to zone bit identification according to the cathode groups and the steel bar numbers;
for the AB surface of the side wall, a carbon block area and a melt area are firstly divided in the X direction according to the steel bar number and the Z direction, and the melt area is divided into an aluminum liquid area and an electrolyte
For the steel bar area, area identification is carried out according to A1-1, A1-2, A2-1, A2-2,. An-1, Bn-2, B1-1, B1-2, B2-1, B2-2,. Bn-1 and Bn-2, wherein n is the number of cathode groups of the electrolytic cell, A refers to the electricity inlet side of the electrolytic cell, B refers to the electricity outlet side of the electrolytic cell, the side wall is A1 negative, A1 aluminum and A1 melting.. An negative, An aluminum and An melting; b1 cathode, B1 aluminum, B1 melting.. Bn cathode, Bn aluminum melt mark the cathode region, molten aluminum region, electrolyte region of the side wall, the furnace floor is a1 inside, a1 outside, B1 inside, B1.. An inside, An outside, Bn inside, Bn outside.
(2) Infrared thermography photographing and summarizing
The method comprises the following steps of respectively carrying out infrared thermal imaging photographing on the bottom, the side wall and the steel bar of the electrolytic cell by using a patrol trolley, and taking 1 to n infrared pictures in each temperature measuring area according to photographing precision, a coverage area, measurement space limitation and the size of the electrolytic cell, wherein n is equal to the number of cathodes;
respectively summarizing the temperature information of the bottom, the side wall and the steel bar of the electrolytic cell to generate the temperature distribution information of the whole cell at the lower part of the electrolytic cell comprising the bottom, the side wall and the steel bar. The infrared photos of the furnace bottom, the side wall and the steel bar in the temperature measuring areas are respectively combined and deduplicated according to the location identification to generate the infrared photo of each area and remove the sheltered part, such as the sheltered part of the steel beam on the furnace bottom, one furnace bottom, A, B side walls, a flue end and an aluminum outlet end, A, B steel bars and each photo records the temperature information of each location.
(3) High-limit alarm for temperature of aluminum electrolysis cell
Screening the highest point in each temperature measuring area of the bottom plate temperature, the side wall temperature and the steel bar temperature, judging whether the highest point exceeds the temperature alarm high limit threshold of the electrolytic bath temperature measuring area, if the bottom plate temperature exceeds 150 ℃, the steel bar temperature exceeds 300 ℃, the side wall melt area temperature exceeds 350 ℃, comparing all temperature points in the area with the point temperature high limit threshold of the corresponding temperature measuring area and recording the area and the position, the temperature and the area of the area, and carrying out safety alarm prompt, wherein the temperature alarm high limit threshold is set according to the furnace wall thickness of the electrolytic bath of the enterprise and the grasping precision of the enterprise, the furnace bottom plate temperature threshold is set to be three standards of winter, summer and spring and autumn according to the local temperature, and if the standards of winter, spring and autumn and steel bar in the general areas respectively differ by 10-20 ℃, the highest in winter and the highest in summer.
(4) Aluminum cell temperature rising trend early warning
Comparing the temperature of each identification area in the three temperature measurement areas with the temperature collected in the previous 3 days, judging whether the temperature has an ascending trend and exceeds a threshold value, if the ascending temperature exceeds 5-10 ℃, carrying out safety early warning,
(5) temperature anomaly reminding method for adjacent identification areas of aluminum electrolysis cell
Comparing and analyzing the temperature of each identification area in the three temperature measurement areas with the temperature of the adjacent identification area to judge whether the temperature of the area is obviously different, if so, carrying out safety reminding,
(6) determining inspection frequency
According to the states and parameters of the electrolytic cells, different polling frequencies are set for different types of electrolytic cells, a normal cell is used once a week, when the iron and silicon content rises for 5 continuous days or the iron content is greater than 0.14% for two continuous times or abnormal early warning is found at a temperature point, polling is performed once a day, polling is performed once every shift to polling is performed once every 2 hours after temperature warning is found, and the like, the temperature of the electrolytic cell is analyzed by an infrared imaging machine according to the processes of the steps (1) to (5) during polling, the temperature abnormality is reminded, early warned and alarmed in advance, the leakage of the electrolytic cell is prevented, and the safe production of the aluminum electrolytic cell is facilitated.
Example 2:
(1) position identification of bottom, side wall and steel bar position of electrolytic bath
Carry out the position sign to the stove bottom of electrolysis trough, lateral wall and rod iron position, to the cell bottom plate, divide into carbon block A face outside (1/4), A face inside (1/4), B face outside (1/4), B face inside (1/4) according to the cathode carbon block in the Y direction of electrolysis trough, use the cathode carbon block to divide as the interval subregion in the X direction of electrolysis trough, number according to the negative pole group number, number the position sign according to negative pole group number and rod iron to the cathode steel bar, to lateral wall AB face according to the rod iron number in the X direction, the Z direction is at first divide carbon block district and melt zone, melt zone subdivides aluminium liquid district and electrolyte. The steel bar area is marked with area marks according to A1-1, A1-2, A2-1, A2-2,. An-1, An-2, B1-1, B1-2, B2-1, B2-2,. Bn-1, Bn-2, n is the number of cathode groups of the electrolytic cell, A refers to the electricity inlet side of the electrolytic cell, B refers to the electricity outlet side of the electrolytic cell, the side wall is marked with A1 cathode, A1 aluminum, A1 melting
(2) Infrared thermography photographing and summarizing
The infrared thermal imaging shooting method is characterized in that the infrared thermal imaging shooting is respectively carried out on the furnace bottom, the side wall and the steel bar of the electrolytic cell in a shooting rod mode, 1 to n infrared pictures are shot in each temperature measuring area according to the shooting precision, the coverage area, the measuring space limit and the size of the electrolytic cell, and n is equal to the number of cathodes. Respectively summarizing the temperature information of the bottom, the side wall and the steel bar of the electrolytic cell to generate the temperature distribution information of the whole cell at the lower part of the electrolytic cell comprising the bottom, the side wall and the steel bar. Combining and regenerating infrared photos of furnace bottom, side wall and steel bar temperature measuring areas respectively according to location identification to generate infrared photos of each area and removing shielded parts, such as shielding positions of steel beams on the furnace bottom, one furnace bottom, A, B side walls, flue ends and aluminum outlet ends, A, B steel bars and temperature information of different locations wrapped by each photo.
(3) High-limit alarm for temperature of aluminum electrolysis cell
Screening out the highest point in each temperature of three temperature measuring areas of furnace bottom plate temperature, side wall temperature and steel bar temperature, judging whether the highest point exceeds the temperature alarm high-limit threshold of the electrolytic bath temperature measuring area, if the furnace bottom plate temperature exceeds 100 ℃, the steel bar temperature exceeds 250 ℃, the side wall melt area temperature exceeds 300 ℃, comparing all temperature points and the temperature high-limit threshold of the area if the highest point exceeds the temperature alarm high-limit threshold, recording the area and the position, the temperature and the area of the overtemperature point, and carrying out safety alarm prompt, wherein the temperature high-limit threshold in the embodiment is according to different positions: and (3) a highest temperature alarm limit value curve related to different identification area positions in each temperature measurement area of the furnace bottom, the side wall and the steel bar, if the temperature difference from the center to the end part is 10 ℃, comparing all temperature points in the area, recording the position, the temperature and the area of the area, and giving an alarm prompt. The temperature alarm high limit threshold and the threshold curve are set according to the furnace wall thickness of the electrolytic cell of the enterprise and the accuracy required to be mastered by the enterprise, and the furnace bottom plate temperature threshold is set to three standards of winter, summer and spring and autumn according to the local air temperature, such as the standard difference value of the winter, the spring and autumn and the summer in general areas is 5-10 ℃.
(4) Aluminum cell temperature rising trend early warning
And comparing the temperature of each identification area in the three temperature measurement areas with the temperature of the previous 5 days, analyzing and judging whether the temperature has an ascending trend and exceeds a threshold value, and performing safety early warning if the temperature continuously rises for 5 days or the overall trend rises by more than 3-5 ℃.
(5) Temperature difference early warning between cathode steel bars
And measuring that the temperature difference between the two steel bars of the cathode at the bottom of the aluminum electrolytic cell exceeds 3-10 ℃, and carrying out safety early warning on the steel bars of the cathode.
(6) Temperature anomaly reminding method for adjacent identification areas of aluminum electrolysis cell
And comparing and analyzing the temperature of each identification area in the three temperature measurement areas with the temperature of the adjacent area to judge whether an obvious difference exceeding 3-5 ℃ exists or not, and if so, carrying out safety reminding.
(7) Determining inspection frequency
According to the states and parameters of the electrolytic cells, different polling frequencies are set for different types of electrolytic cells, a normal cell is used once a week, when the iron-silicon content rises continuously for 5 days or the iron content is more than 0.12% continuously for two weeks or abnormal early warning is found at a temperature point, the normal cell is used for polling once a day, when temperature warning is found, the normal cell is used for polling once a shift to polling once every 2 hours, and the like, the temperature of the electrolytic cell is analyzed by an infrared imaging machine according to the processes of the steps (1) to (5) every time, the temperature abnormality is reminded, early warned and alarmed in advance, the leakage of the electrolytic cell is prevented, and the safe production of the aluminum electrolytic cell is facilitated.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a safety early warning method, which comprises the steps of carrying out zone bit identification on at least one type of temperature measuring areas in a furnace bottom area, a side wall area and a steel bar area of an aluminum electrolytic cell, and dividing identification areas; then obtaining temperature distribution data of the temperature measurement area through infrared thermal imaging; then, four early warning mechanisms are designed: for the condition that the temperature of the identification area exceeds the limit, performing furnace leakage risk alarm with the highest grade to prompt that the furnace leakage risk is required to be processed immediately; for the condition that the temperature rising trend of a certain identification area exceeds a rising threshold value, carrying out second-level potential furnace leakage risk early warning, and timely checking potential areas which are possibly developed into furnace leakage risks; similarly, the judgment is carried out according to the temperature deviation between the cathode steel bars, so as to check the potential furnace leakage risk of the steel bars as early as possible; and (4) carrying out third-level safety reminding on the condition that the adjacent identification areas are compared with the identification areas with abnormal temperature deviation, and finding out the abnormal temperature areas as early as possible to prevent the risk of furnace leakage in the bud. By combining the three-level early warning mechanisms for correspondingly warning, early warning and reminding aiming at the four temperature abnormal conditions, a set of complete aluminum electrolytic cell leakage risk warning and early risk early warning scheme is established, the ambient temperature of the aluminum electrolytic cell and the leakage warning are provided for production personnel in advance, and diagnosis can be timely intervened at the early stage of leakage risk occurrence or leakage risk inoculation according to warning, early warning and reminding information, so that leakage accidents are effectively prevented, and the safe and stable production of the electrolytic cell is ensured.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (11)
1. A safety early warning method for an aluminum electrolysis cell is characterized by comprising the following steps:
determining at least one type of temperature measurement area on the aluminum electrolytic cell, respectively determining more than two location identifications on each type of temperature measurement area, and respectively determining corresponding identification areas according to the location identifications; the temperature measurement area comprises a furnace bottom area, a side wall area and a steel bar area;
according to a preset frequency, respectively carrying out infrared thermal imaging photographing on each type of temperature measurement area to obtain temperature distribution data of the temperature measurement area comprising a corresponding identification area;
judging whether the highest temperature value in each type of temperature measurement area exceeds the temperature upper limit threshold of the corresponding temperature measurement area; if the maximum temperature value exceeds the temperature high limit threshold of the corresponding identification area, determining all over-temperature points of which the temperatures exceed the temperature high limit threshold of the corresponding temperature measurement area from all position points of the temperature measurement area, recording the positions, the identification areas and the temperature values of the over-temperature points, counting the over-temperature areas of the over-temperature points, and outputting safety alarm information;
judging whether the temperature of each identification area at the current moment is in an ascending trend and whether the value of the ascending trend exceeds an ascending threshold value compared with the temperature of each identification area within a preset time period before the current moment; if the value of the rising trend exceeds the rising threshold value, outputting safety early warning information corresponding to the identification area;
judging whether the temperature deviation between two steel bars of each cathode exceeds a steel bar temperature difference threshold value or not, and if the temperature deviation between the two steel bars exceeds the steel bar temperature difference threshold value, outputting safety early warning information corresponding to the identification area;
judging whether the temperature deviation between each identification area and the adjacent identification area exceeds an identification area temperature difference threshold value or not; and if the temperature deviation between the identification area and the adjacent identification area exceeds the identification area temperature difference threshold value, outputting safety reminding information corresponding to the identification area.
2. The safety precaution method according to claim 1, wherein the determining of more than two location identifiers on each type of the temperature measurement area and the determining of the corresponding identification area according to the location identifiers respectively comprises:
for the furnace bottom area, in the Y direction of the aluminum electrolytic cell, determining furnace bottom position identification on the outside of the surface A of the cathode carbon block of the cell bottom plate according to 1/4, the inside of the surface A according to 1/4, the outside of the surface B according to 1/4 and the inside of the surface B according to 1/4; determining a furnace bottom identification area based on the furnace bottom zone bit identification according to the serial number of cathode groups by taking the cathode carbon blocks as intervals in the X direction of the aluminum electrolytic cell;
for the side wall A surface and the side wall B surface of the side wall area, determining a side wall zone bit identifier and a side wall identifier area according to the serial number of the cathode groups in the X direction and the carbon block area and the melt area in the Z direction; wherein the melt zone comprises an aluminum liquid zone and an electrolyte zone;
and for the steel bar area, determining the steel bar zone bit identification and the steel bar identification area according to the cathode group number and the cathode steel bar number.
3. The safety precaution method according to claim 2, wherein the infrared thermal imaging photographing is performed on each type of the temperature measurement area to obtain temperature distribution data of the temperature measurement area including the corresponding identification area, specifically comprising:
respectively shooting 1-N infrared temperature images of each type of temperature measurement area, wherein N is the number of the cathode groups;
and respectively summarizing and de-duplicating all infrared temperature images of each type of temperature measurement area to obtain temperature distribution data of each type of temperature measurement area comprising a corresponding identification area.
4. The safety precaution method according to claim 1, characterized in that the upper temperature limit threshold and the preset frequency in each type of the temperature measuring area are determined according to the tank type, the tank condition, the current level, the current parameters and the time period of the electrolytic tank; wherein, the preset frequency is the polling frequency.
5. The safety precaution method according to claim 1, characterized in that the temperature ceiling threshold is a point temperature ceiling threshold corresponding to the temperature measuring area;
the determining, from all the position points of the temperature measurement area, the overtemperature point at which all the temperatures exceed the temperature upper limit threshold of the corresponding temperature measurement area specifically includes:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the temperature measuring area to which the position point belongs; if so, confirming the position point as the over-temperature point.
6. The safety precaution method according to claim 1, characterized in that the temperature upper threshold is a temperature upper threshold curve, the temperature upper threshold curve includes point temperature upper thresholds of each identification area in the temperature measurement area;
the determining, from all the position points of the temperature measurement area, the overtemperature point at which all the temperatures exceed the temperature upper limit threshold of the corresponding temperature measurement area specifically includes:
judging whether the temperature of each position point in the temperature measuring area exceeds a point temperature upper limit threshold of the identification area to which the position point belongs; if so, confirming the position point as the over-temperature point.
7. The safety precaution method as claimed in claim 5 or 6, characterized in that the point temperature upper threshold or the temperature upper threshold curve is divided according to three standards of winter, summer, spring and autumn according to the seasonal air temperature of the location of the aluminum electrolysis cell.
8. The safety precaution method according to claim 1, wherein the determining whether the temperature of each of the identification areas at the current time is in an increasing trend and the value of the increasing trend exceeds an increasing threshold value compared with the temperature of each of the identification areas within a preset time period before the current time specifically includes:
determining a rise threshold for each of the identified regions;
judging whether the highest temperature of each identification area at the current moment is in an ascending trend or not compared with the highest temperature before the current moment and within a preset time period, and whether the value of the ascending trend exceeds the ascending threshold or not;
and if the identification area with the ascending trend value exceeding the ascending threshold value exists, outputting safety early warning information corresponding to the identification area.
9. The safety precaution method according to claim 1, wherein the determining whether the temperature of each of the identification areas at the current time is in an increasing trend and the value of the increasing trend exceeds an increasing threshold value compared with the temperature of each of the identification areas within a preset time period before the current time specifically includes:
determining a point rising threshold value of each position point in each identification area;
judging whether the temperature of each position point in each identification area at the current moment is in an ascending trend compared with the temperature of each position point in each identification area before the current moment and within a preset time period, and whether the value of the ascending trend exceeds the point ascending threshold of the corresponding position point;
and if the position point with the ascending trend value exceeding the corresponding point ascending threshold value exists, outputting the safety early warning information of the identification area corresponding to the position point.
10. The safety precaution method according to claim 1, characterized in that the temperature upper threshold is a temperature upper threshold curve, the temperature upper threshold curve includes point temperature upper thresholds of each identification area in the temperature measurement area;
the determining whether the temperature deviation between each identification region and the adjacent identification region exceeds an identification region temperature difference threshold specifically includes:
judging whether the maximum value of the temperature deviation between each position point in the identification area and each position point in the adjacent identification area exceeds the temperature difference threshold value of the identification area or not; wherein the identification region temperature difference threshold is a temperature difference gradient between the identification region and the adjacent identification region determined according to a temperature upper limit threshold curve.
11. The safety precaution method of claim 1, further comprising:
when the safety alarm information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once every shift to once every two hours;
when the safety early warning information or the safety reminding information is output, the inspection frequency of the aluminum electrolytic cell is increased from the preset frequency to once a day;
and when the iron and silicon content is increased, increasing the inspection frequency of the aluminum electrolytic cell from the preset frequency to once a day.
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