CN101592651A - The assay method of carbon content of molten steel in electric steelmaking furnace - Google Patents
The assay method of carbon content of molten steel in electric steelmaking furnace Download PDFInfo
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- CN101592651A CN101592651A CNA2009101581082A CN200910158108A CN101592651A CN 101592651 A CN101592651 A CN 101592651A CN A2009101581082 A CNA2009101581082 A CN A2009101581082A CN 200910158108 A CN200910158108 A CN 200910158108A CN 101592651 A CN101592651 A CN 101592651A
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Abstract
The present invention has disclosed a kind of assay method of carbon content of molten steel in electric steelmaking furnace, it utilizes common gases flowmeter etc. to determine the consumption and the force value of gas mediums such as oxygen, rock gas, extract the molten final proof of electric furnace smelting and record the wherein parameter value of carbon element content, calculate carbon content of molten steel in electric steelmaking furnace by formula, thereby judge finishing the time of coming out of the stove of steel-making; Using method of the present invention is simple, is not subjected to the influence of heat size, material feelings, decarbonation appliance configuration, and carbon content of molten steel forecast precision height adopts and carries out the judgement of the current carbon content of molten steel in electric steelmaking furnace with reference to this method, the accuracy rate height, and improved the production efficiency of steel-making.
Description
Technical field
The present invention relates to Electric Furnace Steelmaking, specifically is the calculating mensuration that the interior consumption parameter of making steel gas mediums such as necessary oxygen, rock gas of utilization stove is carried out carbon content of molten steel in the smelting process, belongs to metallurgical steelmaking technical field.
Background technology
Electric furnace claims electric arc furnaces again, is the slubbing operation of short flow process steel-making.The process of electric furnace steel making, be to raw materials such as molten iron in the adding stove and steel scraps, the employing electrifying electrodes heats up, and adopts the mode of fire door oxygen rifle and continuous oxygen blast of many sidewall oxygen rifles and rock gas to promote temperature and constantly reduces the process of carbon and other constituent content in the raw material.In EAF Steelmaking Process, underspeeding of elements such as carbon, silicon, phosphorus influences each other because of separately content, smelting endpoint before tapping, can the basis for estimation that directly tap be whether carbon, phosphorus composition content and the temperature thereof in the molten steel satisfies target call, therefore, can the carbon content that accurately judge the molten steel of smelting process and terminal point seem most important in electric furnace steel making production.
The control technology that smelting endpoint carbon content judging nicety rate improves can be strengthened the control of steel-making time, shortens the production time, reduces the consumption that oxygen, carburant etc. are produced material, reduces the scaling loss of iron and steel stock, and then improves the production efficiency of steel-making.At present, being used for one of main method that the electric furnace steel making molten steel decides carbon is molten steel sampling in the stove, send the laboratory sample to be analyzed with specialized equipment, measure the content that comprises each element of carbon in the appearance, this method needs processes such as hand sampling, sample presentation, sample preparation, analysis, data network transmission, need to wait for the long period, and the error of the carbon content of molten steel that records is bigger.
Carrying out molten steel, to decide the another kind of method of carbon be to adopt to decide carbon and decide the oxygen gun system, decide the oxygen rifle and prepare and decide carbon and decide directly to insert in the electric furnace stove behind the oxygen head and carry out sample analysis with deciding carbon, analysis speed is very fast, but it is applicable to the situation that the molten steel oxygen content is high, to measuring when high-order in the carbon content, and its easy loss manually uses difficulty big, the use cost height.
Summary of the invention
Fundamental purpose of the present invention is at the deficiencies in the prior art, a kind of method of effective mensuration carbon content of molten steel in electric steelmaking furnace is provided, it can calculate the current carbon content of the molten steel in the converter more in advance, to save the production time, reduce oxygen, carburant etc. and produce the consumption of material, reduce the scaling loss of iron and steel stock, improve the production efficiency of electric furnace steel making.
For realizing the purpose of foregoing invention, the present invention adopts following technical scheme: a kind of assay method of carbon content of molten steel in electric steelmaking furnace is characterized in that: comprise the steps:
1) the common gases flowmeter is installed on the pipeline of gas mediums such as the required oxygen of electric furnace steel making, rock gas to carry out the mensuration of gas flow;
2) extracting electric furnace smelting melts final proof and records wherein carbon element content T
R
3) measurement by gas meter obtains following parameter:
A) the clear oxygen pressure average value P of back of taking a sample in the converter until the current time
Y
B) smelt the sidewall oxygen rifle oxygen utilization A of beginning back until the current time
D
C) smelt the sidewall oxygen rifle oxygen utilization A of beginning back when molten final proof is taken a sample
R
D) smelt the fire door oxygen rifle oxygen utilization B of beginning back until the current time
D
E) smelt the fire door oxygen rifle oxygen utilization B of beginning back when molten final proof is taken a sample
R
F) smelt the sidewall oxygen rifle gas consumption C of beginning back until the current time
D
G) smelt the sidewall oxygen rifle gas consumption C of beginning back when molten final proof is taken a sample
R
4) calculate the carbon content T of molten steel in electric steelmaking furnace by following formula
D:
T
D＝T
R*EXP(D
1*(P
Y/10.5)*(D
2*(A
D-A
R-D
3*(C
D-C
R))+D
4*(B
D-B
R)))
Wherein: EXP is the exponential function of industrial constant e;
D
1, D
2, D
3, D
4Be the dependent constant relevant with decarbonization rate.
Described computing formula is applicable to soon, in, the form of slow three kinds of decarbonization rates, T under these three kinds of forms
DThe value scope of application be respectively: (1) is quick: 1.80＞T
D〉=0.60; (2) middling speed: 1.80＞T
D〉=0.60; (3) at a slow speed: 1.80＞T
D〉=0.80.
Described fast, in, D under slow three kinds of forms
1The difference of value, its D
1, D
2, D
3, D
4Concrete value be: (1) is quick: D
1=-0.001, D
2=0.5, D
3=2, D
4=2.6; (2) middling speed: D
1=-0.0007, D
2=0.5, D
3=2, D
4=2.6; (3) at a slow speed: D
1=-0.00053, D
2=0.5, D
3=2, D
4=2.6.
With respect to prior art, the present invention utilizes gas meter to record the consumption of gas mediums such as the required oxygen of electric furnace steel making, rock gas and the parameter of force value, and by extracting the molten final proof of electric furnace smelting and recording the wherein parameter value of carbon element content, just can calculate carbon content of molten steel in the converter accurately, its mensuration process is simple and convenient, the accuracy rate height; And can utilize computer system to pass through to programme and be provided with and obtain automatically carbon content of molten steel in the converter, can not rely on computer system yet, and carry out the mensuration of some parameters by simple equipment, and just can calculate the carbon content that obtains in the molten steel, thus the better process of control steel-making.
Description of drawings
Fig. 1 is the process flow diagram of electric steelmaking furnace steel-making of the present invention.
Embodiment
As shown in Figure 1, it is the process flow diagram that electric furnace steel making used in the present invention is produced.Wherein, this electric furnace vertical electric arc furnaces of 90T ultra high power that German FUCHS company manufactures and designs of serving as reasons, this electric arc furnaces carries out decarburization by the oxygen blast of sidewall oxygen rifle and fire door oxygen rifle, what wherein sidewall oxygen rifle used is RCB oxygen rifle, RCB oxygen rifle is a coherent oxygen lance, and its principle of work is that the aperture rock gas is fluxed to steel scrap in the stove with the flame of jet oxygen and circulation oxygen burning generation around utilizing.The highest 2100Nm that is designed to of its work oxygen flow
3/ h, oxygen pressure are designed to 10～16 kilograms, the highest 300Nm that is designed to of work gas discharge
3/ h, gas pressure are designed to 5～6 kilograms.Fire door oxygen rifle oxygen pressure is 8～12 kilograms, and the oxygen blast flow is according to being chosen as 2300～2700Nm
3/ h.Carbon component in the converter comes from the carbon in carbon and the molten iron of joining in the material package, and generally speaking, single stove hot metal charge is the carbon height at most, and hot metal charge carbon at least is relatively low.When temperature reaches 1460 ℃ of left and right sides in stove, get molten final proof, produce after after a while, when essential element content such as furnace inner sampling carbon, phosphorus reach technological requirement and temperature and reach 1600 ℃ of left and right sides, can tap.The infrastructure device that this method has utilized electric furnace steel making to produce, carry out the mensuration of some parameters as gas meter, and affirmations of must the STEELMAKING PRODUCTION operating personnel during furnace inner sampling simply taking a sample, and just can obtain the carbon content of molten steel in the converter by formula calculating.
The mensuration of concrete carbon content of molten steel has:
1) the common gases flowmeter is installed on the pipeline of the required gas medium of electric furnace steel making to carry out the mensuration of gas flow;
2) extracting electric furnace smelting melts final proof and records wherein carbon element content T
R
3) measurement by gas meter obtains following parameter:
A) the clear oxygen pressure average value P of back of taking a sample in the converter until the current time
Y
B) smelt the sidewall oxygen rifle oxygen utilization A of beginning back until the current time
D
C) smelt the sidewall oxygen rifle oxygen utilization A of beginning back when molten final proof is taken a sample
R
D) smelt the fire door oxygen rifle oxygen utilization B of beginning back until the current time
D
E) smelt the fire door oxygen rifle oxygen utilization B of beginning back when molten final proof is taken a sample
R
F) smelt the sidewall oxygen rifle gas consumption C of beginning back until the current time
D
G) smelt the sidewall oxygen rifle gas consumption C of beginning back when molten final proof is taken a sample
R
4) calculate the carbon content T of molten steel in electric steelmaking furnace by following formula
D:
T
D＝T
R*EXP(D
1*(P
Y/10.5)*(D
2*(A
D-A
R-D
3*(C
D-C
R))+D
4*(B
D-B
R)))
Wherein: EXP is the exponential function of industrial constant e;
D
1, D
2, D
3, D
4Be the dependent constant relevant with decarbonization rate.
In concrete the use, above-mentioned computing formula is divided into soon, in, the steel-making form of slow 3 kinds of speed, difference is the D that is correlated with
1The difference of value.Used constant term D in the concrete formula
1, D
2, D
3, D
4Value be respectively: 1. quick: D
1=-0.001, D
2=0.5, D
3=2, D
4=2.6; 2. middling speed: D
1=-0.0007, D
2=0.5, D
3=2, D
4=2.6; 3. at a slow speed: D
1=-0.00053, D
2=0.5, D
3=2, D
4=2.6.With fast, in, slow 3 kinds of forms calculate the current carbon element content T of electric furnace smelting molten steel
DThe time, divide other scope of application to be: 1. quick: 1.80%＞T
D〉=0.60%; 1. middling speed: 1.80%＞T
D〉=0.60%; 1. at a slow speed: 1.80%＞T
D〉=0.80%.
In the method for continuously measuring of above-mentioned carbon content of molten steel in electric steelmaking furnace, it also can carry out the automatic mensuration of carbon content by establishment utility software shell script in computer system, and its operation comprises the steps:
(1) after electric furnace steel making began, shell script moved automatically;
When (2) taking a sample, the flushing and casting personnel simply confirm operation at every turn;
(3) calculate the molten clear average value P of back of taking a sample in the stove automatically until the oxygen pressure of current time
Y
(4) automatically get the oxygen consumption value 1 and the natural gas consumption value 1 of fire door oxygen rifle and sidewall oxygen rifle when melting final proof;
The oxygen consumption value 2 and the natural gas consumption value 2 of fire door oxygen rifle and sidewall oxygen rifle when (5) getting the 2nd sample automatically;
(6) extract the oxygen consumption value and the natural gas consumption value of fire door oxygen rifle and the sidewall oxygen rifle of current time automatically;
(7) judge that automatically whether the carbon content of molten final proof is less than 1.80%, if the carbon content of molten final proof is worth less than this, then use value 1 in the step (4) and all the other correlations to calculate current carbon content, and the carbon content calculating value of all samples is presented on the industry control picture after the current carbon content values that will calculate and the 2nd sample by described formula; If the carbon content of molten final proof is worth more than or equal to this, then use value 2 in the step (5) and all the other correlations to calculate current carbon content, and the carbon content calculating value of all samples is presented on the industry control picture after the current carbon content values that will calculate and the 3rd sample by described formula;
(8) electric furnace list stove is smelted when finishing, and all collection value and calculated values are reset to 0.
Current carbon content and sample value carbon content are after showing on the user interface, electric furnace steel making stokehold operating personnel can make accurately the current carbon content of molten steel in the stove, intuitive analysis, carrying out tapping in advance prepares, tapping relatively in advance, saved the duration of heat, reduced the scaling loss of iron and steel stock and the peroxidating probability of molten steel, saved raw and auxiliary materials such as oxygen, carburant, sampler, and alleviated working strength of workers relatively.
Below provide some specific embodiments:
Embodiment 1: loyal steelworks one workshop 90T electric furnace steel making production is moistened in Sha Gang group, heat (batch) number 2348 stoves in 2009, steel grade C70DA, molten final proof carbon element content is 0.82%, sidewall oxygen rifle oxygen utilization is 1823 cubic metres when getting molten final proof, fire door oxygen rifle oxygen utilization is 831 cubic metres, sidewall oxygen rifle gas consumption is 291 cubic metres, sidewall oxygen rifle oxygen utilization is 2003 cubic metres when getting the 2nd sample and also being the terminal point sample, fire door oxygen rifle oxygen utilization is 921 cubic metres, sidewall oxygen rifle gas consumption is 313 cubic metres, and actual the 2nd sample carbon content values is 0.61%, and the calculated value that this method calculates is 0.63%;
Embodiment 2: loyal steelworks one workshop 90T electric furnace steel making production is moistened in Sha Gang group, heat (batch) number 2351 stoves in 2009, steel grade C70DA, molten final proof carbon element content is 1.15%, sidewall oxygen rifle oxygen utilization is 2097 cubic metres when getting molten final proof, fire door oxygen rifle oxygen utilization is 1123 cubic metres, sidewall oxygen rifle gas consumption is 300 cubic metres, sidewall oxygen rifle oxygen utilization is 2332 cubic metres when getting the 2nd sample, fire door oxygen rifle oxygen utilization is 1260 cubic metres, sidewall oxygen rifle gas consumption is 326 cubic metres, and actual the 2nd sample carbon content values is 0.83%, and the calculated value that this method calculates is 0.84%; Sidewall oxygen rifle oxygen utilization is 2516 cubic metres when getting the 3rd sample and also being the terminal point sample, fire door oxygen rifle oxygen utilization is 1357 cubic metres, sidewall oxygen rifle gas consumption is 343 cubic metres, and actual the 3rd sample carbon content values is 0.65%, and the calculated value that this method calculates is 0.64%;
Embodiment 3: loyal steelworks one workshop 90T electric furnace steel making production is moistened in Sha Gang group, heat (batch) number 2382 stoves in 2009, steel grade C80DA, molten final proof carbon element content is 1.02%, sidewall oxygen rifle oxygen utilization is 1891 cubic metres when getting molten final proof, fire door oxygen rifle oxygen utilization is 1070 cubic metres, sidewall oxygen rifle gas consumption is 334 cubic metres, sidewall oxygen rifle oxygen utilization is 2232 cubic metres when getting the 2nd sample and also being the terminal point sample, fire door oxygen rifle oxygen utilization is 1231 cubic metres, sidewall oxygen rifle gas consumption is 367 cubic metres, and actual the 2nd sample carbon content values is 0.66%, and the calculated value that this method calculates is 0.66%;
Embodiment 4: loyal steelworks one workshop 90T electric furnace steel making production is moistened in Sha Gang group, heat (batch) number 2384 stoves in 2009, steel grade C80DA, molten final proof carbon element content is 1.41%, sidewall oxygen rifle oxygen utilization is 1885 cubic metres when getting molten final proof, fire door oxygen rifle oxygen utilization is 815 cubic metres, sidewall oxygen rifle gas consumption is 407 cubic metres, sidewall oxygen rifle oxygen utilization is 2082 cubic metres when getting the 2nd sample, fire door oxygen rifle oxygen utilization is 937 cubic metres, sidewall oxygen rifle gas consumption is 429 cubic metres, and actual the 2nd sample carbon content values is 1.07%, and the calculated value that this method calculates is 1.07%; Sidewall oxygen rifle oxygen utilization is 2408 cubic metres when getting the 3rd sample and also being the terminal point sample, fire door oxygen rifle oxygen utilization is 1108 cubic metres, sidewall oxygen rifle gas consumption is 459 cubic metres, and actual the 3rd sample carbon content values is 0.70%, and the calculated value that this method calculates is 0.70%;
Embodiment 5: loyal steelworks one workshop 90T electric furnace steel making production is moistened in Sha Gang group, heat (batch) number 2419 stoves in 2009, steel grade C70DA, molten final proof carbon element content is 1.67%, sidewall oxygen rifle oxygen utilization is 1526 cubic metres when getting molten final proof, fire door oxygen rifle oxygen utilization is 869 cubic metres, sidewall oxygen rifle gas consumption is 292 cubic metres, sidewall oxygen rifle oxygen utilization is 1735 cubic metres when getting the 2nd sample, fire door oxygen rifle oxygen utilization is 963 cubic metres, sidewall oxygen rifle gas consumption is 312 cubic metres, and actual the 2nd sample carbon content values is 1.34%, and the calculated value that this method calculates is 1.35%; Sidewall oxygen rifle oxygen utilization is 1961 cubic metres when getting the 3rd sample, and fire door oxygen rifle oxygen utilization is 1061 cubic metres, and sidewall oxygen rifle gas consumption is 331 cubic metres, and actual the 3rd sample carbon content values is 1.03%, and the calculated value that this method calculates is 1.04%; Sidewall oxygen rifle oxygen utilization is 2407 cubic metres when getting the 4th sample and also being the terminal point sample, fire door oxygen rifle oxygen utilization is 1268 cubic metres, sidewall oxygen rifle gas consumption is 369 cubic metres, and actual the 4th sample carbon content values is 0.58%, and the calculated value that this method calculates is 0.60%.
Technology contents of the present invention and technical characterictic have disclosed as above; yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and are done all replacement and modifications that does not deviate from spirit of the present invention; therefore; protection domain of the present invention should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present invention and modifications, and contained by the present patent application claim.
Claims (4)
1. the assay method of a carbon content of molten steel in electric steelmaking furnace is characterized in that: comprise the steps:
1) the common gases flowmeter is installed on the pipeline of the required gas medium of electric furnace steel making to carry out the mensuration of gas flow;
2) extracting electric furnace smelting melts final proof and records wherein carbon element content T
R
3) measurement by gas meter obtains following parameter:
A) the clear oxygen pressure average value P of back of taking a sample in the converter until the current time
Y
B) smelt the sidewall oxygen rifle oxygen utilization A of beginning back until the current time
D
C) smelt the sidewall oxygen rifle oxygen utilization A of beginning back when molten final proof is taken a sample
R
D) smelt the fire door oxygen rifle oxygen utilization B of beginning back until the current time
D
E) smelt the fire door oxygen rifle oxygen utilization B of beginning back when molten final proof is taken a sample
R
F) smelt the sidewall oxygen rifle gas consumption C of beginning back until the current time
D
G) smelt the sidewall oxygen rifle gas consumption C of beginning back when molten final proof is taken a sample
R
4) calculate the carbon content T of molten steel in electric steelmaking furnace by following formula
D:
T
D＝T
R*EXP(D
1*(P
Y/10.5)*(D
2*(A
D-A
R-D
3*(C
D-C
R))+D
4*(B
D-B
R)))
Wherein: EXP is the exponential function of industrial constant e;
D
1, D
2, D
3, D
4Be the dependent constant relevant with decarbonization rate.
2. the assay method of carbon content of molten steel in electric steelmaking furnace according to claim 1 is characterized in that: described computing formula is applicable to soon, in, the form of slow three kinds of decarbonization rates, T under these three kinds of forms
DThe value scope of application be respectively: (1) is quick: 1.80＞T
D〉=0.60; (2) middling speed: 1.80＞T
D〉=0.60; (3) at a slow speed: 1.80＞T
D〉=0.80.
3. the assay method of carbon content of molten steel in electric steelmaking furnace according to claim 2 is characterized in that: described fast, in, D under slow three kinds of forms
1The difference of value, its D
1, D
2, D
3, D
4Concrete value be: (1) is quick: D
1=-0.001, D
2=0.5, D
3=2, D
4=2.6; (2) middling speed: D
1=-0.0007, D
2=0.5, D
3=2, D
4=2.6; (3) at a slow speed: D
1=-0.00053, D
2=0.5, D
3=2, D
4=2.6.
4. the assay method of carbon content of molten steel in electric steelmaking furnace according to claim 1, it is characterized in that: the gas medium in the described step (1) comprises oxygen and rock gas.
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|---|---|---|---|
| CN 200910158108 CN101592651B (en) | 2009-07-13 | 2009-07-13 | Method for measuring carbon content of molten steel in electric steelmaking furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910158108 CN101592651B (en) | 2009-07-13 | 2009-07-13 | Method for measuring carbon content of molten steel in electric steelmaking furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044699A (en) * | 2018-10-12 | 2020-04-21 | 莱芜钢铁集团电子有限公司 | Judgment method, device and system for scrap steel melting down |
| CN113604630A (en) * | 2021-07-28 | 2021-11-05 | 北京科技大学 | Electric arc furnace steelmaking end point control method |
-
2009
- 2009-07-13 CN CN 200910158108 patent/CN101592651B/en active Active
Non-Patent Citations (2)
| Title |
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| 张润宇等: "转炉钢水含碳量的估计", 《自动化学报》 * |
| 胡志刚等: "利用炉气分析进行转炉钢水连续定碳", 《钢铁研究》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044699A (en) * | 2018-10-12 | 2020-04-21 | 莱芜钢铁集团电子有限公司 | Judgment method, device and system for scrap steel melting down |
| CN111044699B (en) * | 2018-10-12 | 2022-04-26 | 莱芜钢铁集团电子有限公司 | Judgment method, device and system for scrap steel melting down |
| CN113604630A (en) * | 2021-07-28 | 2021-11-05 | 北京科技大学 | Electric arc furnace steelmaking end point control method |
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|---|---|
| CN101592651B (en) | 2013-04-24 |
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Inventor after: Chen Guiqiang Inventor after: Cao Bin Inventor before: Zhou Zhimin Inventor before: Gao Yongsheng Inventor before: Li Zengwei Inventor before: Pan Yonglong |
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