CN108690899B - Control system and control method for improving insertion precision of sublance - Google Patents
Control system and control method for improving insertion precision of sublance Download PDFInfo
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- CN108690899B CN108690899B CN201710215768.4A CN201710215768A CN108690899B CN 108690899 B CN108690899 B CN 108690899B CN 201710215768 A CN201710215768 A CN 201710215768A CN 108690899 B CN108690899 B CN 108690899B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a control system and a control method for improving insertion precision of a sublance, which are characterized in that the control system comprises a furnace age judging module, a liquid level height measuring module, a steel tapping amount calculating module, a standard steel tapping amount liquid level height calculating module, a furnace time liquid level height calculating module, a PLC communication module, a PLC sublance control module, a furnace average molten steel liquid level descending height calculating module and a sublance insertion depth calculating module; the technical scheme includes that the liquid level height of molten steel is measured every other certain heat, the insertion depth of a sublance into the liquid level is controlled by calculating the liquid level height in the heat between the two measured liquid level heights, and the control method is changed from manual control to intelligent control.
Description
Technical Field
The invention relates to a control system, in particular to a control system and a control method for improving the insertion accuracy of a sublance, and belongs to the technical field of electrical automation control.
Background
Modern converters generally adopt top-bottom combined blowing and sublance temperature measurement sampling technology. In the smelting process, a sublance is required to be adopted to measure the temperature and the components of the molten steel, so that the sublance is required to be inserted into the molten steel for a certain depth to ensure the success of measurement of the sublance; however, during the smelting process of the converter, the erosion of the lining by the molten steel causes the change of the volume of the converter and the difference of the tapping amount of each time, so that the liquid level of the molten steel in each furnace in the converter is different. The general method is that the height of the liquid level of molten steel is measured by using a sublance at intervals of a certain number of furnaces, and the height is used as a basis for the insertion depth of the sublance into the molten steel in the following furnaces, thereby bringing the following problems: firstly, the volume of the converter is changed along with the erosion of molten steel to a furnace lining in the smelting process of the converter, so that the liquid level height is changed, and secondly, the amount of steel and iron materials loaded into the converter in the smelting process of each furnace causes the difference of the steel tapping amount, so that the liquid level height is also changed, and the accurate prediction of the liquid level height of the molten steel is very important. In actual production, the liquid level height cannot be measured by using the sublance in each furnace (the cost is high, extra time is spent), and if the liquid level height of molten steel is not predicted accurately, the success rate of the sublance measurement is influenced.
In the prior art, the liquid level of molten steel of a heat of the liquid level height measured by the sublance is not available, and automatic control cannot be realized, so that automatic control of sublance control cannot be realized.
Disclosure of Invention
The invention provides a control system and a control method for improving the insertion precision of a sublance, aiming at the technical problems in the prior art.
In order to achieve the above object, the technical solution of the present invention is a control system for improving insertion accuracy of a sublance, wherein the control system comprises a furnace age determination module, a liquid level height measurement module, a steel tapping amount calculation module, a standard steel tapping amount liquid level height calculation module, a furnace time liquid level height calculation module, a PLC communication module, a PLC sublance control module, a furnace average molten steel level descent height calculation module, and a sublance insertion depth calculation module;
the furnace life judging module is used for judging the furnace life of the current converter;
the liquid level height measuring module is used for measuring the height of the liquid level of the molten steel in the converter,
the steel tapping amount calculating module is used for calculating the weight of the molten steel in the heat;
the standard tapping quantity liquid level height calculation module is used for calculating the liquid level height of molten steel under the current furnace standard tapping quantity, and the general technology does not have the technical function of the module;
the furnace molten steel liquid level height calculating module is used for calculating the height of the current furnace molten steel liquid level, and a manual experience prediction method is generally adopted in the general technology;
the PLC communication module is used for communicating with a PLC;
the PLC sublance control module is used for controlling the operation of a sublance;
the furnace average molten steel liquid level descending height calculation module is used for calculating the molten steel liquid level height under the current furnace standard steel tapping quantity, and the general technology does not have the technical function of the module;
the sublance insertion depth calculating module is used for calculating the insertion depth of the sublance according to the liquid level height; according to the technical scheme, the probability of successful measurement of the sublance is improved, manual judgment according to experience is not needed, the accuracy of the insertion depth of the sublance is improved, the height of the molten steel liquid level is automatically calculated, and the insertion depth of the sublance is automatically controlled according to the calculated molten steel liquid level height.
A control method for improving insertion accuracy of a sublance, the method comprising the steps of:
step 1, a furnace life judging module judges the furnace life to execute corresponding operation;
measuring the liquid level height of molten steel by using a lower lance of a converter sublance, and setting the liquid level height as HSteel;
step 3, calculating the tapping amount of the furnace by a tapping amount calculation module;
step 5, the furnace life judging module judges whether the furnace life of the heat is 0 (new furnace), if so, the step 8 is executed;
step 6, calculating the average molten steel liquid level descending height of each furnace by a furnace average molten steel liquid level descending height calculation module under the standard steel tapping quantity;
Step 9, the PLC communication module carries out information exchange
The PLC communication module sends the calculated sublance insertion depth information to a PLC sublance control module;
step 10, the PLC sublance control module controls the operation of the sublance
The PLC sublance control module controls related operations according to the insertion depth of a sublance;
and step 11, ending.
As an improvement of the present invention, in the step 1, specifically, when the furnace time starts, the furnace life judging module judges whether the furnace life (the new furnace life is 0, and 1 is added to the furnace life every time of smelting) is an integer multiple of n (n represents a cycle period, that is, the liquid level height is measured once every n furnaces by using a sublance, the value of n is generally 8-15, and the value of the plum steel is 10), if not, the step 7 is performed.
In step 3, as a modification of the present invention, specifically as follows,
the calculation module calculates the steel tapping amount WeiSteel of the furnace;
WeiSteel＝k1*(WeiIron+WeiScrap+WeiPigIron+k2*WeiRoe)
wherein, WeiIron is the weight of the molten iron added into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is generally between 0.45 and 0.55.
As a modification of the invention, in the step 4, specifically as follows,
the standard tap-off quantity refers to the weight of molten steel at the nominal volume of the converter, for example, the standard tap-off quantity of a 300t converter is 300t, and converters with different nominal volumes are different; calculating the liquid level height HStandard corresponding to the steel quantity according to the liquid level height of the molten steel and the weight WeiSteel of the molten steel;
HStandard＝HSteel+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)
wherein the WeiSteel Standard tap-off weight refers to the weight of molten steel at the nominal volume of the converter, for example, the standard tap-off weight of a 300t converter is 300t, and converters with different nominal volumes are different; rho is the density of molten steel, and is 7.0kg/cm3(ii) a r is the radius of the inner circumference of the converter, and is a constant value depending on the shape of the converter.
As an improvement of the present invention, in the step 6, specifically, according to the liquid level height corresponding to the standard steel tapping amount calculated in the previous cycle and the current cycle, the liquid level drop height HFall of molten steel in each furnace under the average standard steel tapping amount is calculated; turning to step 8;
HFall＝(HStandard1-HStandard2)/n；
wherein, HStandard1 is the liquid level height corresponding to the standard tapping quantity calculated in the last cycle; HStandard2 is the liquid level height corresponding to the standard tapping amount calculated in the current cycle; n is the cycle period.
As an improvement of the invention, in the step 7, 71) a steel tapping amount calculating module calculates the weight WeiSteel of the molten steel expected to be tapped from the furnace;
WeiSteel＝k1*(WeiIron+WeiScrap+WeiPigIron+k2*WeiRoe)
wherein, WeiIron is the weight of the molten iron added into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is between 0.45 and 0.55;
72) calculating the liquid level height of the molten steel of the furnace;
HSteel＝HStandard+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)+HFall*m；
wherein m is the smelting heat number in the cycle.
As a modification of the present invention, in step 8, specifically, DepthSublance ═ HSteel1+ K3;
wherein, K3 is constant, which means the depth of the sublance probe inserted into the molten steel, and is 500-700 mm. The sublance and the probe of each manufacturer are different, and the values are also different;
the terms used in the present invention are explained:
height of molten steel level: the distance between the highest point of the sublance and the liquid level of molten steel in the furnace is smaller when the distance between the liquid level of the molten steel and the ground is larger,
a sublance: the head of the device can be provided with different types of probes (such as a TSC probe for measuring temperature, sampling and carbon determination, and a TSO probe for measuring temperature, sampling and oxygen determination), and the head of the device can be provided with a liquid level measuring probe for measuring the liquid level of the molten steel;
furnace lining: the refractory material inside the converter forms an inner lining for protecting the furnace shell of the converter and reducing the temperature loss in the converter, and the steel tapping amount is as follows: predicted weight of molten steel in the converter.
Compared with the prior art, the invention has the advantages that 1) the technical scheme realizes the accurate calculation of the liquid level height of the molten steel of the heat, the liquid level height of the prior art is estimated by manual experience, and the accurate calculation is realized according to the charge amount of the heat and the liquid level height of the molten steel of the initial heat; 2) the technical scheme automatically controls the insertion depth of the sublance, and the prior art manually sets the insertion depth of the sublance on an operation picture according to manual experience; 3) the technical scheme improves the measurement accuracy of the sublance and the service life of the sublance, the prior art controls the insertion depth of the sublance by manual experience, and inevitably ensures that the insertion depth of the sublance into molten steel is inconsistent, so that the defects exist that firstly, if the insertion depth of the sublance into the molten steel is not enough, the molten steel contacted with a probe of the sublance can not represent the effective components and the temperature of the molten steel, and the measurement accuracy of the sublance is reduced; secondly, if the inserted molten steel is too deep, the sublance body is inserted into the molten steel, the sublance body is corroded seriously by the high-temperature molten steel, and the service life of the sublance is shortened.
Drawings
FIG. 1 is a schematic diagram of a converter and an auxiliary converter;
FIG. 2 is a schematic diagram showing the logical relationship between the modules of the control device;
fig. 3 is a flow chart of the control method.
In the figure: 1. a converter shell and an inner furnace lining; 2. a sublance; 3. a sublance probe; 4. slag level; 5. molten steel; 6. the liquid level of the molten steel; 7. HSteel liquid level height; 8. a height reference plane.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1 and 2, the control system for improving the insertion accuracy of the sublance comprises a furnace age judging module, a liquid level height measuring module, a steel tapping amount calculating module, a standard steel tapping amount liquid level height calculating module, a furnace time liquid level height calculating module, a PLC communication module, a PLC sublance control module, a furnace average molten steel liquid level descending height calculating module and a sublance insertion depth calculating module;
the furnace life judging module is used for judging the furnace life of the current converter;
the liquid level height measuring module is used for measuring the height of the liquid level of the molten steel in the converter,
the steel tapping amount calculating module is used for calculating the weight of the molten steel in the heat;
the standard tapping quantity liquid level height calculation module is used for calculating the liquid level height of molten steel under the current furnace standard tapping quantity, and the general technology does not have the technical function of the module;
the furnace molten steel liquid level height calculating module is used for calculating the height of the current furnace molten steel liquid level, and a manual experience prediction method is generally adopted in the general technology;
the PLC communication module is used for communicating with a PLC;
the PLC sublance control module is used for controlling the operation of a sublance;
the furnace average molten steel liquid level descending height calculation module is used for calculating the molten steel liquid level height under the current furnace standard steel tapping quantity, and the general technology does not have the technical function of the module;
the sublance insertion depth calculating module is used for calculating the insertion depth of the sublance according to the liquid level height; according to the technical scheme, the probability of successful measurement of the sublance is improved, manual judgment according to experience is not needed, the accuracy of the insertion depth of the sublance is improved, the height of the molten steel liquid level is automatically calculated, and the insertion depth of the sublance is automatically controlled according to the calculated molten steel liquid level height.
Example 2: referring to fig. 1 and 2, a control method for improving insertion accuracy of a sublance comprises the following steps:
step 1, a furnace life judging module judges the furnace life to execute corresponding operation; specifically, in the step 1, when the heat starts, the furnace life judging module judges whether the furnace life (the new furnace life is 0, and 1 is added to the furnace life every time a furnace is smelted) is an integral multiple of n (n represents a cycle period, namely, the liquid level height is measured once by using a sublance every n furnaces, the value of n is generally 8-15, the value of plum steel is 10), and if the furnace life is not the integral multiple of n, the step 7 is executed.
measuring the liquid level height of molten steel by using a lower lance of a converter sublance, and setting the liquid level height as HSteel;
step 3, calculating the tapping amount of the furnace by a tapping amount calculation module; in the step 3, specifically, as follows,
the calculation module calculates the steel tapping amount WeiSteel of the furnace;
WeiSteel＝k1*(WeiIron+WeiScrap+WeiPigIron+k2*WeiRoe)
wherein, WeiIron is the weight of the molten iron added into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is generally between 0.45 and 0.55.
the standard tap-off quantity refers to the weight of molten steel at the nominal volume of the converter, for example, the standard tap-off quantity of a 300t converter is 300t, and converters with different nominal volumes are different; calculating the liquid level height HStandard corresponding to the steel quantity according to the liquid level height of the molten steel and the weight WeiSteel of the molten steel;
HStandard＝HSteel+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)
wherein the WeiSteel Standard tap-off weight refers to the weight of molten steel at the nominal volume of the converter, e.g. 300t for a 300t converter, with a different nominal tap-off weightVolumetric converters are not the same; rho is the density of molten steel, and is 7.0kg/cm3(ii) a r is the radius of the inner circumference of the converter, and is a constant value depending on the shape of the converter.
Step 5, the furnace life judging module judges whether the furnace life of the heat is 0 (new furnace), if so, the furnace life judging module turns to
step 6, calculating the average molten steel liquid level descending height of each furnace by a furnace average molten steel liquid level descending height calculation module under the standard steel tapping quantity; specifically, according to the liquid level height corresponding to the standard steel tapping amount calculated in the previous cycle and the current cycle, the liquid level descending height HFall of molten steel in each furnace under the average standard steel tapping amount is calculated; turning to step 8;
HFall＝(HStandard1-HStandard2)/n；
wherein, HStandard1 is the liquid level height corresponding to the standard tapping quantity calculated in the last cycle; HStandard2 is the liquid level height corresponding to the standard tapping amount calculated in the current cycle; n is the cycle period.
WeiSteel＝k1*(WeiIron+WeiScrap+WeiPigIron+k2*WeiRoe)
wherein, WeiIron is the weight of the molten iron added into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is between 0.45 and 0.55;
72) calculating the liquid level height of the molten steel of the furnace;
HSteel＝HStandard+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)+HFall*m；
wherein m is the smelting heat number in the cycle.
wherein, K3 is constant, which means the depth of the sublance probe inserted into the molten steel, and is 500-700 mm. The sublance and the probe of each manufacturer are different, and the values are also different;
step 9, the PLC communication module carries out information exchange
The PLC communication module sends the calculated sublance insertion depth information to a PLC sublance control module;
step 10, the PLC sublance control module controls the operation of the sublance
The PLC sublance control module controls related operations according to the insertion depth of a sublance;
and step 11, ending.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (8)
1. A control system for improving insertion accuracy of a sublance is characterized by comprising a furnace age judging module, a liquid level height measuring module, a steel tapping amount calculating module, a standard steel tapping amount liquid level height calculating module, a furnace time liquid level height calculating module, a PLC communication module, a PLC sublance control module, a furnace average molten steel liquid level descending height calculating module and a sublance insertion depth calculating module;
the furnace life judging module is used for judging the furnace life of the current converter;
the liquid level height measuring module is used for measuring the height of the liquid level of the molten steel of the converter, and the steel tapping amount calculating module is used for calculating the weight of the molten steel of the next time;
the standard tapping quantity liquid level height calculation module is used for calculating the liquid level height of molten steel under the current furnace standard tapping quantity, and the general technology does not have the technical function of the module;
the furnace molten steel liquid level height calculating module is used for calculating the height of the current furnace molten steel liquid level, and a manual experience prediction method is generally adopted in the general technology;
the PLC communication module is used for communicating with a PLC;
the PLC sublance control module is used for controlling the operation of a sublance;
the furnace average molten steel liquid level descending height calculation module is used for calculating the molten steel liquid level height under the current furnace standard steel tapping quantity, and the general technology does not have the technical function of the module;
and the sublance insertion depth calculating module is used for calculating the insertion depth of the sublance according to the liquid level height.
2. A control method for improving insertion accuracy of a sublance, the method comprising the steps of:
step 1, a furnace life judging module judges the furnace life to execute corresponding operation;
step 2, the liquid level height measuring module measures the liquid level height;
measuring the liquid level height of molten steel by using a lower lance of a converter sublance, and setting the liquid level height as HSteel;
step 3, calculating the tapping amount of the furnace by a tapping amount calculation module;
step 4, calculating the liquid level height corresponding to the standard steel tapping amount of the current heat by a standard steel tapping amount liquid level height calculation module;
step 5, the furnace life judging module judges whether the furnace life of the heat is 0, namely a new furnace, if so, the step 8 is switched to;
step 6, calculating the average molten steel liquid level descending height of each furnace by a furnace average molten steel liquid level descending height calculation module under the standard steel tapping quantity;
step 7, calculating the heat liquid level height HSteel by a heat liquid level height calculation module;
step 8, calculating the insertion depth of the sublance by a sublance insertion depth calculation module;
step 9, the PLC communication module exchanges information;
the PLC communication module sends the calculated sublance insertion depth information to a PLC sublance control module;
step 10, the PLC sublance control module controls the operation of a sublance;
the PLC sublance control module controls related operations according to the insertion depth of a sublance;
and step 11, ending.
3. The control method for improving the insertion accuracy of the sublance as recited in claim 2, wherein in the step 1, specifically, when the furnace number starts, the furnace age judging module judges whether the furnace age is an integer multiple of n, wherein n represents a cycle period, namely the sublance is adopted to measure the liquid level once every n furnaces, the value of n is 8-15, and if the furnace age is not the integer multiple of n, the step 7 is executed.
4. The control method for improving the insertion accuracy of a sublance as recited in claim 3, wherein in the step 3, specifically,
the calculation module calculates the steel tapping amount WeiSteel of the furnace;
WeiSteel＝k1*(WeiIron+WeiScrap+WeiPigIron+k2*WeiRoe)
wherein, WeiIron is the weight of the molten iron added into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is generally between 0.45 and 0.55.
5. The control method for improving the insertion accuracy of a sublance as recited in claim 4, wherein the step 4 is specifically as follows,
calculating the liquid level height HStandard corresponding to the steel quantity according to the liquid level height of the molten steel and the weight WeiSteel of the molten steel;
HStandard＝HSteel+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)
wherein the WeiSteel Standard tap-rate refers to the weight of molten steel at the nominal capacity of the converter;rho is the density of molten steel, and is 7.0kg/cm3(ii) a r is the radius of the inner circumference of the converter, and is a constant value depending on the shape of the converter.
6. The control method for improving the insertion accuracy of the sublance as recited in claim 5, wherein in the step 6, a molten steel level drop height HFall per furnace at an average standard tapping amount is calculated based on the liquid level heights corresponding to the standard tapping amounts calculated in the previous cycle and the present cycle; turning to step 8;
HFall＝(HStandard1-HStandard2)/n；
wherein, HStandard1 is the liquid level height corresponding to the standard tapping quantity calculated in the last cycle; HStandard2 is the liquid level height corresponding to the standard tapping amount calculated in the current cycle; n is the cycle period.
7. The control method for improving the insertion accuracy of the sublance as set forth in claim 6, wherein in step 7, specifically, 71) the steel-tapping amount calculating module calculates the weight WeiSteel of the molten steel expected to be tapped from the furnace;
WeiSteel (k 1) (WeiIron + WeiScap + WeiIgIron + k2 WeiRoe), wherein WeiIron is the weight of the molten iron blended into the converter;
WeiScap is the weight of the scrap steel added into the converter;
WeiPIIron is the weight of the pig iron block added into the converter;
WeiRoe is the weight of iron ore added to the converter;
k1, k2 are constants, k1 represents the yield, and the value range is between 0.9 and 0.98; according to different grades of iron ores, the value range of k2 is between 0.45 and 0.55;
72) calculating the liquid level height of the molten steel of the furnace;
HSteel＝HStandard+(WeiSteelStandard-WeiSteel)/(π*ρ*r*r)+HFall*m；
wherein m is the smelting heat number in the cycle.
8. The control method for improving the insertion accuracy of the sub-gun according to claim 7, wherein in step 8, specifically, depthSublance HSteel1+ K3;
wherein HSteel1 is the liquid level height of the molten steel in the furnace;
the constant K3 means the depth of the sublance probe required to be inserted into the molten steel, and is 500-700 mm.
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