CN101592651B - Method for measuring carbon content of molten steel in electric steelmaking furnace - Google Patents
Method for measuring carbon content of molten steel in electric steelmaking furnace Download PDFInfo
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- CN101592651B CN101592651B CN 200910158108 CN200910158108A CN101592651B CN 101592651 B CN101592651 B CN 101592651B CN 200910158108 CN200910158108 CN 200910158108 CN 200910158108 A CN200910158108 A CN 200910158108A CN 101592651 B CN101592651 B CN 101592651B
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Abstract
The invention discloses a method for measuring carbon content of molten steel in an electric steelmaking furnace. The method utilizes a common gas flowmeter and the like to measure the consumption and the pressure value of oxygen, natural gas and other gas media, extracts a melting down sample smelted by the electric furnace, measures the parameter value of the carbon content and calculates the carbon content of the molten steel in the steel-making furnace of the electric furnace through a formula so as to judge the tapping completion time of steelmaking; the invention has a simple service method, is influenced by furnace capacity, material situation, configuration of decarbonization equipment and has high forecasting precision of the carbon content of the molten steel; and the method makes a judgment on the current carbon content of the molten steel in the electric steelmaking furnace with high accuracy and improves the production efficiency of steelmaking.
Description
Technical field
The present invention relates to Electric Furnace Steelmaking, the calculating of specifically using the interior consumption parameter of making steel the gas mediums such as necessary oxygen, rock gas of stove to carry out carbon content of molten steel in the smelting process is measured, and belongs to metallurgical steelmaking technical field.
Background technology
Electric furnace claims again electric arc furnaces, is the slubbing operation of short flow process steel-making.The process of electric furnace steel making, to raw materials such as the molten iron in the adding stove and steel scraps, the employing electrifying electrodes heats up, and adopts the mode of furnace door oxygen lance and the continuous oxygen blast of branched sidewall oxygen rifle 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 the 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, can the carbon content that therefore, 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 decide carbon is the interior liquid steel sampling of stove, send the laboratory with specialized equipment sample to be analyzed, measure the content that comprises each element of carbon in the appearance, the method needs the 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 larger.
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 behind the oxygen head and carry out sample analysis with deciding carbon, analysis speed is very fast, but it is only applicable to the high situation of Oxygen Content in Liquid Steel, can't measure when high-order in the carbon content, and its easy loss manually uses difficulty large, and use cost is high.
Summary of the invention
Fundamental purpose of the present invention is for 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 the 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) clear sampling is rear until the oxygen pressure average value P of current time in the converter
Y
B) the smelting beginning is rear until the sidewall oxygen rifle oxygen utilization A of current time
D
C) smelt after the beginning until the sidewall oxygen rifle oxygen utilization A during molten final proof sampling
R
D) the smelting beginning is rear until the furnace door oxygen lance oxygen utilization B of current time
D
E) smelt after the beginning until the furnace door oxygen lance oxygen utilization B during molten final proof sampling
R
F) the smelting beginning is rear until the sidewall oxygen rifle gas consumption C of current time
D
G) smelt after the beginning until the sidewall oxygen rifle gas consumption C during molten final proof sampling
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 the 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 accurately carbon content of molten steel in the converter, its mensuration process is simple and convenient, and accuracy rate is high; And can utilize computer system to pass through to programme and arrange and automatically obtain 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 furnace door oxygen lance, what wherein sidewall oxygen rifle used is RCB oxygen rifle, RCB oxygen rifle is 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.The furnace door oxygen lance 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 bag, and generally speaking, single stove hot metal charge at most carbon is high, and hot metal charge at least carbon is relatively low.When temperature reaches 1460 ℃ of left and right sides in stove, get molten final proof, produce after after a while, when the 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 such 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) clear sampling is rear until the oxygen pressure average value P of current time in the converter
Y
B) the smelting beginning is rear until the sidewall oxygen rifle oxygen utilization A of current time
D
C) smelt after the beginning until the sidewall oxygen rifle oxygen utilization A during molten final proof sampling
R
D) the smelting beginning is rear until the furnace door oxygen lance oxygen utilization B of current time
D
E) smelt after the beginning until the furnace door oxygen lance oxygen utilization B during molten final proof sampling
R
F) the smelting beginning is rear until the sidewall oxygen rifle gas consumption C of current time
D
G) smelt after the beginning until the sidewall oxygen rifle gas consumption C during molten final proof sampling
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, minute other scope of application is: 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 by establishment utility software shell script in computer system the automatic mensuration of carbon content, and its operation comprises the steps:
(1) after electric furnace steel making began, shell script moved automatically;
(2) during every sub-sampling, the flushing and casting personnel simply confirm operation;
(3) automatically calculate in the stove after the molten clear sampling until the average value P of the oxygen pressure of current time
Y
Oxygen consumption value 1 and the natural gas consumption value 1 of furnace door oxygen lance and sidewall oxygen rifle when (4) automatically getting molten final proof;
Oxygen consumption value 2 and the natural gas consumption value 2 of furnace door oxygen lance and sidewall oxygen rifle when (5) automatically getting the 2nd sample;
(6) automatically extract oxygen consumption value and the natural gas consumption value of furnace door oxygen lance and the sidewall oxygen rifle of current time;
(7) whether the carbon content of the molten final proof of automatic decision 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 by described formula, 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; 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 by described formula, 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;
(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 user interface shows, electric furnace steel making stokehold operating personnel can make accurately the current carbon content of molten steel in the stove, intuitive analysis, carrying out in advance tapping prepares, relatively in advance tapping, saved the duration of heat, reduced the scaling loss of iron and steel stock and the peroxidating probability of molten steel, saved the raw and auxiliary materials such as oxygen, carburant, sampler, and relatively alleviated workman's labour intensity.
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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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, the furnace door oxygen lance 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 the furnace door oxygen lance 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, the furnace door oxygen lance 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 (2)
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) clear sampling is rear until the oxygen pressure average value P of current time in the converter
Y
B) the smelting beginning is rear until the sidewall oxygen rifle oxygen utilization A of current time
D
C) smelt after the beginning until the sidewall oxygen rifle oxygen utilization A during molten final proof sampling
R
D) the smelting beginning is rear until the furnace door oxygen lance oxygen utilization B of current time
D
E) smelt after the beginning until the furnace door oxygen lance oxygen utilization B during molten final proof sampling
R
F) the smelting beginning is rear until the sidewall oxygen rifle gas consumption C of current time
D
G) smelt after the beginning until the sidewall oxygen rifle gas consumption C during molten final proof sampling
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 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.
And, described fast, in, under slow three kinds of forms, 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.
2. 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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|---|---|---|---|
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| CN101592651B true CN101592651B (en) | 2013-04-24 |
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| 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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