CN114205943B - Method and system for controlling electrode insertion depth of submerged arc furnace - Google Patents
Method and system for controlling electrode insertion depth of submerged arc furnace Download PDFInfo
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- CN114205943B CN114205943B CN202111494713.4A CN202111494713A CN114205943B CN 114205943 B CN114205943 B CN 114205943B CN 202111494713 A CN202111494713 A CN 202111494713A CN 114205943 B CN114205943 B CN 114205943B
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- 238000003780 insertion Methods 0.000 title claims abstract description 42
- 230000037431 insertion Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004070 electrodeposition Methods 0.000 claims description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/06—Electrodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
- H05B7/109—Feeding arrangements
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- Vertical, Hearth, Or Arc Furnaces (AREA)
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Abstract
The invention discloses a method for controlling the insertion depth of an electrode of a submerged arc furnace, which comprises the following specific steps: performing multiple heat tests to determine an empirical value M 0; after determining an empirical value M 0, putting the submerged arc furnace into production, and calculating the weight of the corresponding electrode as the measured mass M 1; the measured mass M 1 is compared with the empirical value M 0. The advantages are that: according to the method, the measured weight of the electrode is measured by measuring the pressure intensity on the hydraulic loop of the lifting oil cylinder, and compared with an empirical value, the insertion depth of the electrode can be controlled to be at the optimal insertion depth, meanwhile, the yield of the submerged arc furnace is ensured, and a better reference basis is provided for a producer to judge the furnace condition. And the measured quality of the three-phase electrode is the same by controlling the lifting of the electrode, so that the three-phase electrode is inserted to the same depth, the three-phase electrode can work at the same position at the same time, and the three small crucibles are communicated into a whole by mutual synergistic effect, so that a larger crucible is formed, and the yield of the submerged arc furnace can be further increased.
Description
Technical field:
The invention relates to the technical field of submerged arc furnace control, in particular to a method and a system for controlling the electrode insertion depth of a submerged arc furnace.
The background technology is as follows:
The Si-Mn alloy is an alloy composed of Mn, si, fe, small amount of C and other elements, and is a Fe alloy with wider application and higher yield. The submerged arc furnace is a main device for smelting silicon-manganese alloy and mainly comprises a furnace shell, a furnace cover, a furnace lining, a short net, a water cooling system, a smoke discharging system, a dust removing system, electrodes, an electrode pressure releasing and lifting system, a loading and unloading system, a holding mechanism, a burner, a hydraulic system, a submerged arc furnace transformer, various electrical equipment and the like. The electrode pressing and lifting system comprises a pressing system and a lifting system, wherein the lifting system comprises a lifting oil cylinder and a lifting oil cylinder control system, the lifting oil cylinder clamps an electrode through a holding mechanism, the lifting oil cylinder control system can control the extension or retraction of a lifting oil cylinder telescopic rod, the electrode is controlled to descend or ascend through the holding mechanism, the electrode is inserted into a furnace burden to perform submerged arc operation, the energy and current of an electric arc are utilized to pass through the furnace burden, and the energy is generated due to the resistance of the furnace burden to smelt metals.
In the production of silicomanganese, judging the depth of an electrode inserted into furnace burden becomes a great problem for production personnel, and if the electrode depth can be measured, a great reference basis is provided for the production personnel to judge the furnace condition. When the electrode is inserted into the furnace burden shallowly, the phenomena of spark ignition and material collapse are more, the heat loss is large, the furnace temperature is low, and the reaction can not be fully carried out, so that the electrode has no better technical and economic index. Conversely, when the electrode is inserted into the furnace charge deeply, the heat loss is less, the furnace temperature is high, the crucible is large, the chemical reaction speed in the furnace is high, so that the iron removal amount is more, and the unit electricity consumption is low; this is because the arc light generated by the electrode head is strongest, and thus the deeper the electrode head is inserted, the more advantageous the productivity is. Of course, the electrode insertion depth cannot be too deep, so that the furnace bottom loss is large, equipment is frequently damaged, and the cost is increased; if the electrode contacts the hearth, a dead phase is caused in addition to hearth wear, and arc light cannot be generated.
The existing method for judging the electrode insertion depth is roughly divided into two types, one type is to judge the electrode depth according to the secondary voltage, the secondary current and the furnace burden resistance, but the measurement error is large and has great uncertainty due to a large factor affecting the secondary voltage and the secondary current, such as furnace burden proportion, transformer gear, primary voltage and the like. The other is to judge the electrode depth according to the relation between the electrode holder position and the electrode consumption, but the reasons for influencing the electrode consumption are also very much, such as the quality and the proportion of electrode paste, the proportion of furnace burden and the like, and also have a lot of uncertainties.
The invention comprises the following steps:
a first object of the present invention is to provide a method of controlling the electrode insertion depth of a submerged arc furnace, which can increase the yield of the submerged arc furnace.
A second object of the present invention is to provide a system for controlling the depth of insertion of electrodes of a submerged arc furnace, which can increase the yield of the submerged arc furnace.
The first object of the invention is implemented by the following technical scheme: a method for controlling the insertion depth of an electrode of a submerged arc furnace comprises the following specific steps:
step S1, respectively installing a pressure sensor on a hydraulic loop of a lifting oil cylinder of each electrode of the submerged arc furnace, wherein the pressure sensor is used for detecting the hydraulic pressure P on the hydraulic loop;
Step S2, performing multi-heat test, calculating the weight of the corresponding electrode according to the hydraulic pressure P, wherein the insertion depth of the electrode when the unit consumption of electricity is the lowest is the optimal insertion depth, and the weight of the corresponding electrode is an empirical value M 0;
Step S3, after an empirical value M 0 is determined, the submerged arc furnace is put into production, and the measured hydraulic pressure P is utilized to calculate that the corresponding electrode weight is the measured mass M 1;
Step S4, the shallower the electrode is inserted into the furnace charge, the smaller the buoyancy of the furnace charge to the electrode, the larger the supporting force required by the electrode, the larger the hydraulic pressure, along with the consumption of the electrode, the smaller the buoyancy of the furnace charge to the electrode, the larger the supporting force of the lifting oil cylinder to the electrode, the larger the pressure, and the corresponding measured mass M 1 is increased; therefore, the measured mass M 1 is compared with the empirical value M 0, and when the measured mass M 1 of the electrode is large, the insertion depth of the electrode is shallow, and when the measured mass M 1 is small, the insertion depth is deep. Comparing the measured mass M 1 with an empirical value M 0, and controlling the piston rod of the lifting oil cylinder to extend out to enable the electrode to descend when M 1-M0 is not smaller than the upper limit value; when M 1-M0 is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to enable the electrode to rise; when M 1-M0 is between the lower and upper values, no adjustment is made in the electrode position.
Further, the upper limit is 2.5t and the lower limit is-2.5 t.
Further, in step S3, the calculation formula of the measured mass M 1 is:
M1＝PπD2/2000g-M
wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting oil cylinder and the electrode, and the unit is t.
Further, step S4 further includes the following steps: and comparing the measured masses M 1 corresponding to the three-phase electrodes, taking the electrode with the smallest measured mass M 1 as a reference electrode, and controlling the other two electrodes to be lowered until the measured masses M 1 of the other two electrodes are the same as the measured mass M 1 of the reference electrode. The measured mass M1 of the two electrodes with the shallower depth is adjusted to be the same as the measured mass M 1 of the reference electrode, so that the three-phase electrodes can be at the same depth, work is done on the same position by the three-phase electrodes at the same time, and the three small crucibles are communicated into a whole by mutual synergistic effect to form a larger crucible, thus the yield of the submerged arc furnace is increased, the electricity consumption is reduced, and the submerged arc furnace has great economic significance.
The second object of the invention is implemented by the following technical scheme: the system for controlling the electrode insertion depth of the submerged arc furnace comprises a pressure sensor, a data acquisition module, a calculation module, a comparison module and a control module, wherein the pressure sensor for detecting the hydraulic pressure on a hydraulic loop of a lifting cylinder of each electrode of the submerged arc furnace is respectively arranged on the hydraulic loop; the pressure sensor is connected with the data acquisition module, the data acquisition module is connected with the calculation module, the calculation module is connected with the comparison module, the comparison module is connected with the control module, and the control module is connected with the control system of the lifting oil cylinder; in particular, the method comprises the steps of,
The pressure sensor is used for detecting a hydraulic pressure signal on the hydraulic circuit;
The data acquisition module is used for carrying out A/D conversion on the signals acquired by the pressure sensor to obtain digital signals;
The calculation module is used for calculating the weight of the electrode according to the hydraulic pressure P processed by the data acquisition module, and calculating the corresponding weight of the electrode to be the actually measured mass M 1 by using the measured hydraulic pressure P after the submerged arc furnace is put into production;
The comparison module stores an empirical value M 0 and compares the measured mass M 1 with an empirical value M 0;
And the control module is connected with the comparison module and used for controlling the lifting of the lifting oil cylinder according to the comparison result of the comparison module.
Further, the calculation module calculates a calculation formula of the corresponding electrode weight according to the hydraulic pressure P as follows:
M Electrode ＝PπD2/2g-M
Wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting cylinder and the electrode, and the unit is Kg.
Further, the specific process of controlling the lifting cylinder to lift by the control module is as follows: when M 1-M0 is not smaller than the upper limit value, controlling the piston rod of the lifting oil cylinder to extend out so as to enable the electrode to descend; when M 1-M0 is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to enable the electrode to rise; when M 1-M0 is between the lower and upper values, no adjustment is made in the electrode position.
Further, the upper limit is 2.5t and the lower limit is-2.5 t.
Furthermore, the comparison module can also compare the measured quality M 1 corresponding to the three-phase electrode with each other; the specific process of controlling the lifting cylinder to lift by the control module further comprises the following steps: and taking the electrode with the smallest measured mass M 1 as a reference electrode, and controlling the other two electrodes to be lowered until the measured mass M 1 of the other two electrodes is the same as the measured mass M 1 of the reference electrode.
The invention has the advantages that: according to the method, the measured weight of the electrode is measured by measuring the pressure intensity on the hydraulic loop of the lifting oil cylinder, and compared with an empirical value, the insertion depth of the electrode can be controlled to be at the optimal insertion depth, so that the problem of damage of the submerged arc furnace caused by too deep insertion of the electrode is solved, the yield of the submerged arc furnace is ensured, and a better reference basis is provided for a producer to judge the furnace condition. And the measured quality of the three-phase electrode is the same by controlling the lifting of the electrode, so that the three-phase electrode is inserted to the same depth, the three-phase electrode can work at the same position at the same time, and the three small crucibles are communicated into a whole by mutual synergistic effect, so that a larger crucible is formed, and the yield of the submerged arc furnace can be further increased.
Description of the drawings:
Fig. 1 is a flowchart of example 1.
Fig. 2 is a schematic structural diagram of embodiment 2.
A pressure sensor 1, a controller 2, a control system 3 of the lifting oil cylinder and the lifting oil cylinder 4.
The specific embodiment is as follows:
example 1: as shown in fig. 1, a method for controlling the insertion depth of an electrode of a submerged arc furnace comprises the following specific steps:
step S1, respectively installing a pressure sensor on a hydraulic loop of a lifting oil cylinder of each electrode of the submerged arc furnace, wherein the pressure sensor is used for detecting the hydraulic pressure P on the hydraulic loop;
Step S2, performing multi-heat test, calculating the weight of the corresponding electrode according to the hydraulic pressure P, wherein the insertion depth of the electrode when the unit consumption of electricity is the lowest is the optimal insertion depth, and the weight of the corresponding electrode is an empirical value M 0;
The test of determining the empirical value M 0 of the electrode quality adopts an electric furnace with 30MVA, raw materials comprise Brazil low iron, maleic ore, sintering in the factory, brazil middle iron, high-half carbonic acid, australian lump ore, 7 main materials of galite and 5 auxiliary materials of dry slag, large coke, silica, dolomite and small coke, the test period is 7 days, the feeding of an electric furnace bin is ensured to be uninterrupted in the test process, the position of a holder is controlled in the test process to control the electrode insertion depth, the electric furnace is set to be discharged once every 15 ten thousand degrees, the actual power consumption, the output and the electrode weight of each furnace are recorded, and the power consumption is divided by the output to obtain the power consumption unit; test record table as table 1:
Table 1 multiple heat test statistics table
Through analysis of the test statistical table, it can be seen that at the electrode insertion depth of the 17 th heat, the electricity unit consumption is only 3654kwh/t, therefore, the electrode insertion depth at the 17 th heat is determined to be the optimal insertion depth, and the average value of the three-phase electrode quality is taken, so that the empirical value is determined to be M 0 to be 35t.
Step S3, after an empirical value M 0 is determined, the submerged arc furnace is put into production, and the measured hydraulic pressure P is utilized to calculate that the corresponding electrode weight is the measured mass M 1;
The process of calculating the corresponding electrode weight according to the hydraulic pressure P is as follows: firstly, each electrode is correspondingly provided with two lifting oil cylinders, and the area S=pi D 2/2 of the two lifting oil cylinders; obtaining F=ppi D 2/2 according to p=F/S, wherein F is the supporting force of the oil cylinder on the electrode and is equal to the gravity G of the whole electrode and the clamping assembly; next, the overall mass m=ppi D 2/2G of the electrode is derived from the relationship of gravity G and mass M (g=mg, G is generally equal to 9.8N/Kg), this mass including the mass of the electrode and the clamping assembly between the lift cylinder and the electrode; finally, the calculation formula of the electrode weight M Electrode is calculated as follows:
M Electrode ＝PπD2/2g-M
Wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting oil cylinder and the electrode, and the unit is kg.
Step S4, the shallower the electrode is inserted into the furnace charge, the smaller the buoyancy of the furnace charge to the electrode, the larger the supporting force required by the electrode, the larger the hydraulic pressure, along with the consumption of the electrode, the smaller the buoyancy of the furnace charge to the electrode, the larger the supporting force of the lifting oil cylinder to the electrode, the larger the pressure, and the corresponding measured mass M 1 is increased; therefore, the measured mass M 1 is compared with the empirical value M 0, and when the measured mass M 1 of the electrode is large, the insertion depth of the electrode is shallow, and when the measured mass M 1 is small, the insertion depth is deep. Therefore, when M 1-M0 is more than or equal to 2.5t, the piston rod of the lifting oil cylinder is controlled to extend to enable the electrode to descend, when M 1-M0 is less than or equal to-2.5 t, the piston rod of the lifting oil cylinder is controlled to retract to enable the electrode to ascend until M 1-M0 is less than 2.5t, and the lifting electrode is stopped. The arc light generated by the electrode head is strongest, so that under the condition of not damaging the furnace bottom, the electrode head is more beneficial to improving the yield, but if the electrode is inserted too deeply, the furnace bottom is damaged, equipment is frequently damaged, and the cost is increased; therefore, the difference between the measured mass M 1 of the electrode and the empirical value M 0 is smaller than +/-2.5 kg, so that the insertion depth of the electrode is at the optimal insertion depth, and a better reference basis is provided for a producer to judge the furnace condition.
Step S4 further comprises the following procedure: and comparing the measured masses M 1 corresponding to the three-phase electrodes, taking the electrode with the smallest measured mass M 1 as a reference electrode, and controlling the other two electrodes to be lowered until the measured masses M 1 of the other two electrodes are the same as the measured mass M 1 of the reference electrode. The measured mass M1 of the two electrodes with the shallower depth is adjusted to be the same as the measured mass M 1 of the reference electrode, so that the three-phase electrodes can be at the same depth, work is done on the same position by the three-phase electrodes at the same time, and the three small crucibles are communicated into a whole by mutual synergistic effect to form a larger crucible, thus the yield of the submerged arc furnace is increased, the electricity consumption is reduced, and the submerged arc furnace has great economic significance.
Example 2: as shown in fig. 2, a system for controlling the insertion depth of electrodes of a submerged arc furnace for implementing the method in embodiment 1 includes a pressure sensor, a data acquisition module, a calculation module, a comparison module and a control module, wherein a pressure sensor for detecting the hydraulic pressure on a hydraulic circuit is respectively installed on the hydraulic circuit of a lifting cylinder of each electrode of the submerged arc furnace, and the manufacturer selected by the pressure sensor 1 is manufactured by hjone electronic technology company in jin and China, and the model is HPC-348-5-250-000-P. The pressure sensor is connected with the data acquisition module, the data acquisition module is connected with the calculation module, the calculation module is connected with the comparison module, the comparison module is connected with the control module, and the control module is connected with the control system of the lifting oil cylinder; in particular, the method comprises the steps of,
The pressure sensor is used for detecting a hydraulic pressure signal on the hydraulic circuit;
The data acquisition module is used for carrying out A/D conversion on the signals acquired by the pressure sensor to obtain digital signals;
The calculation module is used for calculating the weight of the electrode according to the hydraulic pressure P processed by the data acquisition module, and the calculation module calculates the corresponding calculation formula of the weight of the electrode according to the hydraulic pressure P as follows:
M Electrode ＝PπD2/2g-M
Wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting cylinder and the electrode, and the unit is Kg.
After the submerged arc furnace is put into production, the measured hydraulic pressure P is utilized to calculate the weight of the corresponding electrode as the measured mass M 1;
The comparison module stores an empirical value M 0 and compares the measured mass M 1 with an empirical value M 0; in this embodiment, the empirical value M 0 is set to 35t;
And the control module is connected with the comparison module and used for controlling the lifting of the lifting oil cylinder according to the comparison result of the comparison module.
The control module controls the lifting cylinder to lift in the following concrete process: when M 1-M0 is not less than 2.5t, controlling the piston rod of the lifting oil cylinder to extend out so as to enable the electrode to descend; when M 1-M0 is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to enable the electrode to rise; when M 1-M0 is between the lower and upper values, no adjustment is made in the electrode position.
The comparison module can also compare the measured quality M 1 corresponding to the three-phase electrode with each other; the specific process of controlling the lifting cylinder to lift by the control module further comprises the following steps: and taking the electrode with the smallest measured mass M 1 as a reference electrode, and controlling the other two electrodes to be lowered until the measured mass M 1 of the other two electrodes is the same as the measured mass M 1 of the reference electrode.
Compared with the traditional method for judging the electrode insertion depth, the method can control the electrode insertion depth by directly measuring the pressure on the control loop of the lifting cylinder 4 to push out the actual measurement quality M 1 and comparing the actual measurement quality M 0 with the empirical value M 0, and only the two parameters of the pressure and the quality are involved, but the influences of the parameters such as voltage, current, electrode paste proportion, furnace burden proportion and the like are not involved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method for controlling the insertion depth of an electrode of a submerged arc furnace is characterized by comprising the following specific steps:
step S1, respectively installing a pressure sensor on a hydraulic loop of a lifting oil cylinder of each electrode of the submerged arc furnace, wherein the pressure sensor is used for detecting the hydraulic pressure P on the hydraulic loop;
Step S2, performing multi-heat test, calculating the weight of the corresponding electrode according to the hydraulic pressure P, wherein the insertion depth of the electrode when the unit consumption of electricity is the lowest is the optimal insertion depth, and the weight of the corresponding electrode is an empirical value M 0;
Step S3, after an empirical value M 0 is determined, the submerged arc furnace is put into production, and the measured hydraulic pressure P is utilized to calculate that the corresponding electrode weight is the measured mass M 1;
S4, comparing the actually measured mass M 1 with an empirical value M 0, and controlling the piston rod of the lifting oil cylinder to extend out to enable the electrode to descend when M 1-M0 is not smaller than the upper limit value; when M 1-M0 is not greater than the lower limit value, controlling the piston rod of the lifting oil cylinder to retract so as to enable the electrode to rise; when M 1-M0 is between the lower limit value and the upper limit value, the electrode position is not adjusted;
Step S4 further comprises the following procedure: and comparing the measured masses M 1 corresponding to the three-phase electrodes, taking the electrode with the smallest measured mass M 1 as a reference electrode, and controlling the other two electrodes to be lowered until the measured masses M 1 of the other two electrodes are the same as the measured mass M 1 of the reference electrode.
2. The method of controlling the electrode insertion depth of a submerged arc furnace according to claim 1, wherein the upper limit value is 2.5t and the lower limit value is-2.5 t.
3. The method for controlling the electrode insertion depth of the submerged arc furnace according to claim 1 or 2, wherein the calculation formula for calculating the weight of the corresponding electrode according to the hydraulic pressure P is as follows:
M Electrode ＝PπD2/2g-M
wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting cylinder and the electrode, and the unit is Kg.
4. The system for controlling the electrode insertion depth of the submerged arc furnace is characterized by comprising a pressure sensor, a data acquisition module, a calculation module, a comparison module and a control module, wherein the pressure sensor for detecting the hydraulic pressure on a hydraulic loop of a lifting cylinder of each electrode of the submerged arc furnace is respectively arranged on the hydraulic loop; the pressure sensor is connected with the data acquisition module, the data acquisition module is connected with the calculation module, the calculation module is connected with the comparison module, the comparison module is connected with the control module, and the control module is connected with the control system of the lifting oil cylinder; in particular, the method comprises the steps of,
The pressure sensor is used for detecting a hydraulic pressure signal on the hydraulic circuit;
The data acquisition module is used for carrying out A/D conversion on the signals acquired by the pressure sensor to obtain digital signals;
The calculation module is used for calculating the weight of the electrode according to the hydraulic pressure P processed by the data acquisition module, and calculating the corresponding weight of the electrode to be the actually measured mass M 1 by using the measured hydraulic pressure P after the submerged arc furnace is put into production;
The comparison module stores an empirical value M 0 and compares the measured mass M 1 with an empirical value M 0; the comparison module can also compare the measured quality M 1 corresponding to the three-phase electrode with each other; the specific process of controlling the lifting cylinder to lift by the control module further comprises the following steps: the electrode with the smallest measured mass M 1 is taken as a reference electrode, and the other two electrodes are controlled to be reduced until the measured mass M 1 of the other two electrodes is the same as the measured mass M 1 of the reference electrode;
And the control module is connected with the comparison module and used for controlling the lifting of the lifting oil cylinder according to the comparison result of the comparison module.
5. The system for controlling the electrode insertion depth of the submerged arc furnace according to claim 4, wherein the calculation module calculates a calculation formula of the corresponding electrode weight according to the hydraulic pressure P as follows:
M Electrode ＝PπD2/2g-M
wherein P is hydraulic pressure, and the unit is Pa; d is the diameter of the inner cavity of the lifting oil cylinder, and the unit is m; g is the weight to mass ratio of the object, which is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lifting cylinder and the electrode, and the unit is Kg.
6. The system for controlling the electrode insertion depth of the submerged arc furnace according to claim 4, wherein the specific process of controlling the lifting cylinder to lift by the control module is as follows: when M 1-M0 is not smaller than the upper limit value, controlling the piston rod of the lifting oil cylinder to extend out so as to enable the electrode to descend; when M 1-M0 is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to enable the electrode to rise; when M 1-M0 is between the lower and upper values, no adjustment is made in the electrode position.
7. The system for controlling the electrode insertion depth of a submerged arc furnace of claim 6, wherein the upper limit is 2.5t and the lower limit is-2.5 t.
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| US20210333047A1 (en) * | 2020-04-22 | 2021-10-28 | Billy Bryant | Method and System for Detection of Low Quality Graphite Electrode on an EAF |
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