CN114205943A - Method and system for controlling insertion depth of submerged arc furnace electrode - Google Patents
Method and system for controlling insertion depth of submerged arc furnace electrode Download PDFInfo
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- 230000037431 insertion Effects 0.000 title claims abstract description 43
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- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 12
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- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 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
- 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
- 238000005516 engineering process Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000036632 reaction speed Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 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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- 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
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 a plurality of furnace tests to determine an empirical value M0; determining an empirical value M0Then, the submerged arc furnace is put into production, and the corresponding electrode weight is calculated to be the measured mass M1(ii) a Will measure the mass M1And an empirical value M0A comparison is made. The advantages are that: the method measures the actually measured weight of the electrode by measuring the pressure on the hydraulic circuit of the lifting oil cylinder, compares the actually measured weight with the empirical value, can control the insertion depth of the electrode to be in the optimal insertion depth, simultaneously ensures the yield of the submerged arc furnace, and provides a better reference basis for production personnel to judge the furnace condition. And the three-phase electrode can be inserted to the same depth by controlling the lifting of the electrode, so that the three-phase electrode can do work at the same position at the same time, and the three small crucibles are communicated into a whole to form a larger crucible under the mutual synergistic actionThe crucible can further increase the yield of the submerged arc furnace.
Description
The technical field is as follows:
the invention relates to the technical field of submerged arc furnace control, in particular to a method and a system for controlling the insertion depth of an electrode of a submerged arc furnace.
Background art:
the silicon-manganese alloy is an alloy consisting of manganese, silicon, iron, a small amount of carbon and other elements, and is an iron alloy with wide application and high 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 exhaust system, a dust removal system, electrodes, an electrode pressing, discharging and lifting system, a feeding and discharging 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 and releasing 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 telescopic rod of the lifting oil cylinder, the holding mechanism is further used for controlling the electrode to descend or ascend, the electrode is inserted into furnace burden to carry out submerged arc operation, the energy and the current of 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 metal.
In the production of silicomanganese, the depth of the electrode inserted into the furnace charge is judged to be a great problem to production personnel, and if the depth of the electrode 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 to be shallow, the phenomena of both the phenomena of fire 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 better technical and economic indexes can not be obtained. On the contrary, when the electrode is inserted into the furnace burden deeply, the heat loss is less, the furnace temperature is high, the crucible is large, the chemical reaction speed in the furnace is high, the iron removal amount is large, and the unit power consumption is low; this is because the arc generated by the electrode head is the strongest, and therefore, the deeper the electrode head is inserted, the more advantageous the productivity is, without damaging the hearth. Certainly, the electrode insertion depth cannot be too deep, and the electrode insertion depth is too deep, so that the loss of the furnace bottom is large, the equipment is frequently damaged, and the cost is increased; if the electrode is in contact with the hearth, in addition to hearth loss, a dead phase is also caused and arc light cannot be generated.
The existing methods for judging the electrode insertion depth are roughly divided into two methods, one method is to judge the electrode depth according to secondary voltage, secondary current and furnace burden resistance, but the measurement error is large and uncertainty exists due to a plurality of factors influencing the secondary voltage and the secondary current, such as furnace burden proportion, transformer gear position, primary voltage and the like. The other method is to judge the electrode depth according to the relationship between the electrode holder position and the electrode consumption, but the reasons influencing the electrode consumption are also many, such as the quality and the proportion of electrode paste, the proportion of furnace burden and the like, and a lot of uncertainties exist.
The invention content is as follows:
the first purpose of the invention is to provide a method for controlling the insertion depth of the electrode of the submerged arc furnace, which can increase the yield of the submerged arc furnace.
The second purpose of the invention is to provide a system for controlling the insertion depth of the electrode of the submerged arc furnace, which can increase the yield of the submerged arc furnace.
The first purpose 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 sensors are used for detecting the hydraulic pressure P on the hydraulic loop;
step S2, performing multiple-furnace test, and calculating the corresponding electrode weight according to the hydraulic pressure P, wherein the electrode insertion depth is the optimal insertion depth when the electricity unit consumption is the lowest, and the corresponding electrode weight is an empirical value M0;
step S3, determining an empirical value M0Then, the submerged arc furnace is put into production, and the measured hydraulic pressure P is used for calculating the corresponding electrode weight as the measured mass M1；
Step S4, the shallower the depth of the electrode inserted into the furnace burden, the smaller the buoyancy of the furnace burden 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 burden to the electrode, the larger the supporting force of the lift cylinder to the electrode, the larger the pressure, and the corresponding measured mass M1It is increased; therefore, the mass M will be measured1And an empirical value M0Comparing, and measuring the mass M of the electrode1When the measured mass M is larger, the insertion depth of the electrode is shallow1Smaller indicates a deep insertion depth. Will measure the mass M1And an empirical value M0Making a comparison when M1-M0When the value is not less than the upper limit value, the piston rod of the lifting oil cylinder is controlled to extend out to enable the electrode to descend; when M is1-M0When the time is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to lift the electrode; when M is1-M0When the position is between the lower limit value and the upper limit value, the position of the electrode is not adjusted.
Further, the upper limit value is 2.5t, and the lower limit value is-2.5 t.
Further, in step S3, the mass M is actually measured1The calculation formula of (2) is as follows:
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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the gripping mechanism between the lift cylinder and the electrode, and the unit is t.
Further, step S4 includes the following steps: the measured mass M corresponding to the three-phase electrode1Are compared with each other to measure the mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true. By comparing the measured mass M1 of the two shallow electrodes with the measured mass M of the reference electrode1The three-phase electrodes are adjusted to be the same, the three-phase electrodes can be positioned at the same depth, the three-phase electrodes work at the same position at the same time, and the three small crucibles are communicated into a whole to form a larger crucible under the mutual synergistic effect, so that the yield of the submerged arc furnace is increased, the power consumption is reduced, and the method has great economic significance.
The second purpose of the invention is implemented by the following technical scheme: a system for controlling the insertion depth of electrodes of a 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 is respectively arranged on the hydraulic loop of a lifting oil cylinder of each electrode of the submerged arc furnace; 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 following 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;
calculating modelThe block is used for calculating the weight of the electrode according to the hydraulic pressure P processed by the data acquisition module, and after the submerged arc furnace is put into production, the measured hydraulic pressure P is used for calculating the corresponding weight of the electrode as the measured mass M1；
A comparison module for storing an empirical value M0And will measure the mass M1And an empirical value M0Comparing;
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 formula of the calculation module for calculating the corresponding electrode weight according to the hydraulic pressure P is as follows:
Melectrode for electrochemical cell＝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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lift cylinder and the electrode, and the unit is Kg.
Further, the specific process of the control module controlling the lifting of the lifting oil cylinder is as follows: when M is1-M0When the value is not less than the upper limit value, the piston rod of the lifting oil cylinder is controlled to extend out to enable the electrode to descend; when M is1-M0When the time is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to lift the electrode; when M is1-M0When the position is between the lower limit value and the upper limit value, the position of the electrode is not adjusted.
Further, the upper limit value is 2.5t, and the lower limit value is-2.5 t.
Furthermore, the comparison module can also compare the actual measurement mass M corresponding to the three-phase electrode1Comparing the two with each other; the concrete process that control module control lift cylinder goes up and down still includes: by measured mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true.
The invention has the advantages that: according to the method, the pressure intensity on the hydraulic circuit of the lifting oil cylinder is measured, the measured weight of the electrode is measured, and the measured weight is compared with an empirical value, so that the insertion depth of the electrode can be controlled to be the optimal insertion depth, the problem of damage of the submerged arc furnace caused by the fact that the electrode is inserted too deeply is solved, the yield of the submerged arc furnace is ensured, and a better reference basis is provided for production personnel to judge the furnace condition. And the three-phase electrode can be inserted to the same depth by controlling the lifting of the electrode, so that the three-phase electrode can do work at the same position at the same time, and the three small crucibles are communicated into a whole to form a larger crucible under the mutual synergistic action, thereby further increasing the yield of the submerged arc furnace.
Description of the drawings:
FIG. 1 is a flow chart of example 1.
Fig. 2 is a schematic structural view of embodiment 2.
The device comprises a pressure sensor 1, a controller 2, a control system 3 of a lifting oil cylinder and the lifting oil cylinder 4.
The specific implementation mode 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 sensors are used for detecting the hydraulic pressure P on the hydraulic loop;
step S2, performing multiple-furnace test, and calculating the corresponding electrode weight according to the hydraulic pressure P, wherein the electrode insertion depth is the optimal insertion depth when the electricity unit consumption is the lowest, and the corresponding electrode weight is an empirical value M0;
empirical value M for determining electrode quality0The test adopts a 30MVA electric furnace, the raw materials comprise 7 main materials of Brazilian low-iron, maleic ore, the sintering of the factory, 7 main materials of Brazilian medium-iron, high-half carbonic acid, Australian ore, galapentine ore and 5 auxiliary materials of dry slag, large coke, silica, dolomite and small coke, the test period is 7 days, the uninterrupted feeding of the electric furnace bin is ensured in the test process, the position of a holder is controlled in the test process to control the electrode insertion depth, the furnace is discharged 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; test record tableAs shown in table 1:
TABLE 1 statistical table of multiple heat tests
Through the analysis of the test statistical table, the electricity consumption is only 3654kwh/t under the electrode insertion depth of the 17 th heat, so that the electrode insertion depth of the 17 th heat is determined to be the optimal insertion depth, the average value of the three-phase electrode quality is taken, and the empirical value M can be determined0Is 35 t.
Step S3, determining an empirical value M0Then, the submerged arc furnace is put into production, and the measured hydraulic pressure P is used for calculating the corresponding electrode weight as the measured mass M1；
The process of calculating the corresponding electrode weight according to the hydraulic pressure P is as follows: firstly, each electrode is provided with two lift cylinders, and the area S of the two lift cylinders is pi D2/2; obtaining F pi D2/2 according to p pi 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; then, the overall mass M of the electrode, p pi D2/2G, is determined from the relationship between gravity G and mass M (G is Mg, G is generally equal to 9.8N/Kg), which includes the mass of the electrode and the clamping assembly between the lift cylinder and the electrode; finally, the electrode weight M is calculatedElectrode for electrochemical cellThe calculation formula of (2) is as follows:
Melectrode for electrochemical cell＝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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lift cylinder and the electrode, and the unit is kg.
Step S4, the shallower the depth of the electrode inserted into the furnace burden, the smaller the buoyancy of the furnace burden 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 burden to the electrode, the larger the supporting force of the lift cylinder to the electrode, the larger the pressure, and the corresponding measured mass M1It is increased; therefore, it will be trueMass measurement mass M1And an empirical value M0Comparing, and measuring the mass M of the electrode1When the measured mass M is larger, the insertion depth of the electrode is shallow1Smaller indicates a deep insertion depth. Therefore, when M1-M0When the pressure 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, and when M is larger than or equal to 2.5t, the piston rod of the lifting oil cylinder is controlled to extend to enable the electrode to descend1-M0When the pressure 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 rise until the pressure is less than-2.5 t and less than M1-M0And if the time is less than 2.5t, stopping lifting the electrode. Because the arc light generated by the electrode head is strongest, under the condition of not damaging the furnace bottom, the deeper the electrode head is inserted, the better the productivity is, but if the electrode is inserted too deeply, the furnace bottom loss is caused, the equipment is frequently damaged, and the cost is increased; thus, by controlling the measured mass M of the electrode1And an empirical value M0The difference value of the electrode is less than +/-2.5 kg, so that the insertion depth of the electrode can be in the optimal insertion depth, and a better reference basis is provided for production personnel to judge the furnace condition.
Step S4 further includes the following process: the measured mass M corresponding to the three-phase electrode1Are compared with each other to measure the mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true. By comparing the measured mass M1 of the two shallow electrodes with the measured mass M of the reference electrode1The three-phase electrodes are adjusted to be the same, the three-phase electrodes can be positioned at the same depth, the three-phase electrodes work at the same position at the same time, and the three small crucibles are communicated into a whole to form a larger crucible under the mutual synergistic effect, so that the yield of the submerged arc furnace is increased, the power consumption is reduced, and the method has great economic significance.
Example 2: as shown in fig. 2, a system for controlling the insertion depth of the electrode of the 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 the pressure sensor for detecting the hydraulic pressure on the hydraulic circuit is respectively installed on the hydraulic circuit of the lift cylinder of each electrode of the submerged arc furnace, and the pressure sensor 1 is manufactured by the manufacturer of the electronic technology ltd, johnpo, in jin, with the model number of HPC-348-5-250-. 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 following 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 formula of the calculation module for calculating the corresponding weight of the electrode according to the hydraulic pressure P is as follows:
Melectrode for electrochemical cell＝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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lift cylinder and the electrode, and the unit is Kg.
After the submerged arc furnace is put into production, the measured hydraulic pressure P is used for calculating the corresponding electrode weight as the measured mass M1；
A comparison module for storing an empirical value M0And will measure the mass M1And an empirical value M0Comparing; in this embodiment, an empirical value M is set0Is 35 t;
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 specific process of the control module controlling the lifting of the lifting oil cylinder is as follows: when M is1-M0When the time is not less than 2.5t, the piston rod of the lifting oil cylinder is controlled to extend out to enable the electrode to descend; when M is1-M0When the time is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to lift the electrode; when M is1-M0When the position is between the lower limit value and the upper limit value, the position of the electrode is not adjusted.
Comparison moduleAnd the measured mass M corresponding to the three-phase electrode can be used1Comparing the two with each other; the concrete process that control module control lift cylinder goes up and down still includes: by measured mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true.
Compared with the traditional method for judging the insertion depth of the electrode, the method directly calculates the actually measured mass M by testing the pressure on the control loop of the lifting oil cylinder 41And an empirical value M0The depth of electrode insertion can be controlled by comparison, and only two parameters of pressure and quality are involved, but the influences of parameters such as voltage, current, electrode paste ratio, furnace burden ratio and the like are not involved, so that the measuring method has few influencing factors, more accurate measuring result and higher control precision.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
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 sensors are used for detecting the hydraulic pressure P on the hydraulic loop;
step S2, performing multiple-furnace test, and calculating the corresponding electrode weight according to the hydraulic pressure P, wherein the electrode insertion depth is the optimal insertion depth when the electricity unit consumption is the lowest, and the corresponding electrode weight is an empirical value M0;
step S3, determining an empirical value M0After that, the air conditioner is started to work,putting the submerged arc furnace into production, and calculating the corresponding electrode weight as the measured mass M by using the measured hydraulic pressure P1；
Step S4, measuring the mass M1And an empirical value M0Making a comparison when M1-M0When the value is not less than the upper limit value, the piston rod of the lifting oil cylinder is controlled to extend out to enable the electrode to descend; when M is1-M0When the electrode height is not greater than the lower limit value, the piston rod of the lifting oil cylinder is controlled to retract so that the electrode rises; when M is1-M0When the position is between the lower limit value and the upper limit value, the position of the electrode is not adjusted.
2. The method of 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 as claimed in claim 1 or 2, wherein the calculation formula for calculating the corresponding electrode weight according to the hydraulic pressure P is as follows:
Melectrode for electrochemical cell＝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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lift cylinder and the electrode, and the unit is Kg.
4. The method for controlling the electrode insertion depth of a submerged arc furnace according to any one of claims 1 and 2, wherein the step S4 further comprises the following process: the measured mass M corresponding to the three-phase electrode1Are compared with each other to measure the mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true.
5. The method of claim 3 wherein the steps of controlling the depth of insertion of the electrode into the submerged arc furnace are performed in a single stepS4 further includes the following process: the measured mass M corresponding to the three-phase electrode1Are compared with each other to measure the mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true.
6. A system for controlling the insertion depth of electrodes of a 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 circuit is respectively arranged on the hydraulic circuit of a lifting oil cylinder of each electrode of the submerged arc furnace; 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 following 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;
a calculating module for calculating the electrode weight according to the hydraulic pressure P processed by the data acquisition module, and after the submerged arc furnace is put into production, calculating the corresponding electrode weight as the measured mass M by using the measured hydraulic pressure P1；
A comparison module for storing an empirical value M0And will measure the mass M1And an empirical value M0Comparing;
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.
7. The system for controlling the electrode insertion depth of the submerged arc furnace as claimed in claim 6, wherein the calculation module is configured to calculate the corresponding weight of the electrode according to the hydraulic pressure P by the following formula:
Melectrode for electrochemical cell＝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 is m; g is the ratio of the gravity to the mass of the object and is equal to 9.8N/Kg; m is the mass of the holding mechanism between the lift cylinder and the electrode, and the unit is Kg.
8. The system for controlling the electrode insertion depth of the submerged arc furnace according to claim 6, wherein the specific process of controlling the lifting cylinder to lift by the control module comprises: when M is1-M0When the value is not less than the upper limit value, the piston rod of the lifting oil cylinder is controlled to extend out to enable the electrode to descend; when M is1-M0When the time is not more than-2.5 t, controlling the piston rod of the lifting oil cylinder to retract so as to lift the electrode; when M is1-M0When the position is between the lower limit value and the upper limit value, the position of the electrode is not adjusted.
9. The system of claim 8 wherein the upper limit is 2.5t and the lower limit is-2.5 t.
10. The system for controlling the insertion depth of the electrode of the submerged arc furnace as claimed in claim 8 or 9, wherein the comparison module is further configured to compare the measured mass M corresponding to the three-phase electrode1Comparing the two with each other; the concrete process that control module control lift cylinder goes up and down still includes: by measured mass M1The smallest electrode is a reference electrode, and the other two electrodes are controlled to descend until the measured masses M of the other two electrodes1Measured mass M with reference electrode1The same is true.
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| CN202111494713.4A CN114205943B (en) | 2021-12-08 | Method and system for controlling electrode insertion depth of submerged arc furnace |
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