CN101798609A - Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth - Google Patents
Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth Download PDFInfo
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- CN101798609A CN101798609A CN201010125879.4A CN201010125879A CN101798609A CN 101798609 A CN101798609 A CN 101798609A CN 201010125879 A CN201010125879 A CN 201010125879A CN 101798609 A CN101798609 A CN 101798609A
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- thermopair
- blast furnace
- basque
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Abstract
The invention belongs to the category of ferrous metallurgy, and particularly relates to a method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of a blast-furnace bottom and a lower hearth. The method comprises the following sequential steps of: 1, measuring temperature of the whole lining of the blast-furnace bottom and the lower hearth by utilizing thermo-couple; 2, supposing the numerical reading of the thermo-couple in the step 1 by using an epitaxial method, determining steady stage temperature of lining surface on one side of the lower hearth, simultaneously determining tangent of a steady dip angle of a characteristic curve and determining the variation of an outer limit coordinate of lining temperature by using the following formula in the specification, wherein t* is the steady state temperature of the lining, a* is the tangent of the steady dip angle of the lining temperature curve, xo is the outer limit origin coordinate and b is vertical displacement of the temperature curve in the coordinate t-x; and determining whether the lining is abraded or with increased wall slag according to a symbol of outer limit coordinate variation deltaL. The invention has high measurement precision and strong adaptability and can guarantee the safe and reliable operation of a blast furnace.
Description
Technical field
The invention belongs to the ferrous metallurgy category, relate in particular to a kind of adopt thermopair measure lining temperature with the diagnosis State of Blast Furnace at the bottom of and the method for basque situation down, can be used for carrying out and control work safety and the prolongation campaign of blast furnace ironmaking process to guarantee blast furnace.
Background technology
Known have a kind of electronic simulation method can measure the temperature field of blast furnace furnace foundation
[1]According to this method, measure the temperature field along the degree of depth of State of Blast Furnace pit, otherwise can judge the degree of depth in furnace bottom hole by the temperature on the furnace foundation axis.But this method can not be diagnosed the situation of basque under the blast furnace owing to lack the means of monitoring call parameter, can not guarantee the work that blast furnace is safe and reliable.
Also have that a kind of to diagnose down the method for basque situation according to thermal load also be known, its essence is that the mean value according to furnace bottom below cooling area hot-fluid calculates down the remaining length of basque
[2], calculating formula is:
In the formula: b-lengths of liner, m;
The thermal conductivity of basque under the λ c-, W/mK;
The top temperature of thermopair under t м-furnace bottom, ℃;
The ununiformity coefficient of к-thermal load;
The mean heat flux of cooling area under the qn-furnace bottom, W/m
2K;
R л-carbon brick with the concrete resistance to heat in thermopair top, mK/W.
This method can be used for monitoring down the ablation situation of cupola well
[2]
The a series of experience set(ting)values of substitution make computational accuracy drop to 30% but this method is had in calculating, also do not consider the diversity of inner lining material and the heat physical properties of differing materials simultaneously
[2]
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art part and a kind of measuring accuracy height is provided, and adaptability is strong, can guarantee that the employing thermopair measurement lining temperature of blast furnace safe and reliable operation reaches the method for basque situation down at the bottom of diagnosing State of Blast Furnace.
For achieving the above object, the present invention is achieved in that
Adopt thermopair to measure lining temperature and at the bottom of diagnosing State of Blast Furnace, reach the method for basque situation down, can carry out successively as follows:
I, utilize thermopair to measure furnace bottom and the temperature in the whole liner of cupola well down;
Ii, infer the reading of thermopair in the step I and determine the described steady state temperature on cupola well one sidelining surface down with epitaxial method, determine that simultaneously the liner rational curve stablize the tangent at inclination angle, lining temperature limits the variation of coordinate then definite with following formula outward:
Wherein: t
*Steady state temperature for liner;
a
*Stablize the tangent at inclination angle for the lining temperature curve;
Xo is the former point coordinates of outer limit;
B is the vertical displacement of lining temperature curve among the coordinate t-x;
Iii, limit the symbol of coordinate changes delta L to determine whether liner weares and teares outward or the wall slag increases according to described liner.
As a kind of preferred version, quantity n 〉=3 of the present invention's each some thermopair on following basque is axial.
As another kind of preferred version, thermopair of the present invention can adopt the standard thermopair.
Further, thermopair of the present invention can be provided with protective sleeve.
Further, protective sleeve of the present invention can adopt stainless steel or silica fiber sheath.
In addition, protective sleeve of the present invention is outer can be furnished with protective coating.
Secondly, protective coating of the present invention can adopt copper or anti-chilling and shock heating lacquer.
Adaptability of the present invention is strong, can improve the diagnosis tolerance range of basque situation down, can cause the work safety of blast furnace and the prolongation in campaign thus.Under according to thermal load monitoring blast furnace, in the method for cupola well ablation situation, measure the temperature of cupola well circumference liner down by means of thermopair
[3], to survey temperature at least with the vertical concentric each point of blast-furnace tuyere number and all air port line each point liners.Each measuring point of circumference is buried underground along axis and is no less than three thermopairs.Thermopair only in this way is installed, just can monitor whether to have cupola well gas to produce in the cavity that forms because of long-time running between furnace shell and following cupola well and the hearth bottom cooler and take place and flow, this gas may become blast furnace major accident-" cupola well eating thrown "-reason.Domestic under the diagnosis blast furnace in the basque situation device, in the near outer lining brick of furnace shell, only bury a temperature difference heat galvanic couple underground in the same measuring point, the backup lining brick etch situation that can not reflect very thick [about 2 meters thick], the backup lining brick etch situation of having only the temperature difference heat galvanic couple of close inner lining of furnace brick just can reflect, when first temperature difference heat galvanic couple from the inner lining of furnace brick is fallen also to be fallen by etch simultaneously by etch with lining brick, the 2nd temperature difference heat galvanic couple reflects backup lining brick etch situation again, until the 2nd fallen by etch after, the 3rd temperature difference heat galvanic couple reflects has answered blowing out changeable liner brick.
At the bottom of the State of Blast Furnace and in this diagnostic method of following basque situation, need not to determine following numerical value:
-heat-conduction coefficient;
The nonuniformity coefficient of-thermal load;
The mean heat flux of-following cooling area;
The resistance to heat of-liner.
In the method for this diagnosis liner situation, among all included lining temperature field information of all essential information, this information is by means of that be embedded in standard in the liner or special-purpose
[3]Thermoelectricity obtains occasionally.
Thermopair protective sleeve of the present invention is protected with tailor-(made) coating, and coating can protect thermode not to be carbonized, and guarantees that it all can work in the whole campaign at blast furnace.Each thermopair couples together by means of extension line or compensating lead wire, is equipped with information-calculating integration unit, and this device is with the situation of automated manner detecting temperature value and evaluation liner.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.Protection scope of the present invention not only is confined to the statement of following content.
Figure 1A is Chinese Shaoguan 2500m
3Blast furnace is installed the temperature reflection and the liner ablation record at thermopair position;
Figure 1B is Chinese Flos Bombacis Malabarici 1719m
3Blast furnace is installed the temperature reflection and the liner ablation record at thermopair position;
Fig. 2 is that the present invention is along measured temperature result on three positions of axis;
Fig. 3 is 12 last 1,2,3 thermopair displayed record of No. 1 blast furnace of Flos Bombacis Malabarici of the present invention the 9th string band circumference;
Fig. 4 is a blast furnace thermocouple metering circuit functional block diagram of the present invention;
Fig. 5 for blast furnace section of the present invention and thermopair at the embedding figure of lining.
Embodiment
Adopt thermopair to measure lining temperature and at the bottom of diagnosing State of Blast Furnace, reach the method for basque situation down, can carry out successively as follows:
I, utilize thermopair to measure furnace bottom and the temperature in the whole liner of cupola well down;
Ii, infer the reading of thermopair in the step I and determine the described steady state temperature on cupola well one sidelining surface down with epitaxial method, determine that simultaneously the liner rational curve stablize the tangent at inclination angle, lining temperature limits the variation of coordinate then definite with following formula outward:
Wherein: t
*Steady state temperature for liner;
a
*Stablize the tangent at inclination angle for the lining temperature curve;
Xo is the former point coordinates of outer limit;
B is the vertical displacement of lining temperature curve among the coordinate t-x;
Iii, limit the symbol of coordinate changes delta L to determine whether liner weares and teares outward or the wall slag increases according to described liner.
At least measure in the described step I on all air port lines of blast furnace with the vertical concentric each point of air port number on temperature.
Quantity n 〉=3 of the present invention's each some thermopair on following basque is axial; Described thermopair adopts the standard thermopair, can be provided with protective sleeve on described thermopair, and described protective sleeve adopts stainless steel or silica fiber to make; Described protective sleeve is furnished with copper or anti-chilling and shock heating lacquer class protective coating outward.
What the present invention also can determine to take place according to outside coordinate Δ L change sign (being negative just) is liner wearing and tearing or the wall slag increases: when Δ L is wearing and tearing during for negative ("-" number), Δ L is the growth of wall slag during for just ("+" number).
Measure the most serious position of liner ablation, just adopted the infusibility material
[4]To this position wall built-up slag.The distribution that the composition of control furnace charge reaches at furnace roof just can guarantee normal and safe liner situation, has also just prolonged the campaign of blast furnace simultaneously.
Referring to Figure 1A, be Chinese Shaoguan 2500m
3Blast furnace is installed the temperature reflection and the liner ablation record at thermopair position;
Referring to Figure 1B, be Chinese Flos Bombacis Malabarici 1719m
3Blast furnace is installed the temperature reflection and the liner ablation record at thermopair position; Indicated relative reference dimension with solid black lines and dotted line on the radially straightforward face;
Referring to Fig. 2, for the present invention along measured temperature result on three positions of axis, wherein a measuring point on the blast furnace circumference is Shaoguan;
Referring to Fig. 3, be 12 last 1,2,3 thermopair displayed record of No. 1 blast furnace of Flos Bombacis Malabarici of the present invention the 9th string band circumference;
Referring to Fig. 4, be blast furnace thermocouple metering circuit functional block diagram of the present invention;
Referring to Fig. 5, for blast furnace section of the present invention and thermopair at the embedding figure of lining.1,2,3 is the temperature difference heat galvanic couple.
Embodiment
Referring to Fig. 2, it is last apart from the distance of liner starting point 17mm that the temperature difference heat galvanic couple is installed in water cooler one side.The stationary value of temperature difference heat galvanic couple temperature equaled 215 ℃ when blast furnace started.Constant b equals 78 ℃.Stable state curve inclination angle is 50 degree.50 degree tangent of an angles are 1.19.The starting point length x of liner.Be 1200mm.The extension value of temperature equals on 1200mm length: 1200:17 * 215 ℃=1517 ℃.
In this value substitution calculating formula:
The error of measurement is when on December 22nd, 2007, blast furnace started:
9mm/1200mm×100％＝0.75％
On six blast furnaces of China, implemented with following basque situation diagnostic method at the bottom of the State of Blast Furnace:
-Shaoguan, № 7, № 5 blast furnaces, 2005,2009;
-Jinan, № 3 blast furnaces, 2006;
-Xuanhua, № 2, № 3 blast furnaces, 2007,2008;
-Flos Bombacis Malabarici, № 1 blast furnace, 2008.
Embed enclosed standard couple (thermopair) in the liner of furnace bottom and following cupola well, model is Б Т П (Н Н) 2 * 0.3 and Б Т П (Х А) 2 * 0.3.
Temperature difference heat galvanic couple protective sleeve is protected with tailor-(made) coating, and coating can protect thermode not to be carbonized, and guarantees that it all can work in the whole campaign at blast furnace.Each temperature difference heat galvanic couple couples together by means of extension line or compensating lead wire, is equipped with information-calculating integration unit (blast furnace supervisory control desk), and this device is with the situation of automated manner detecting temperature value and evaluation liner.
From blast furnace opening constantly continuously measured Fig. 2 liner each the point on temperature value till temperature reaches steadily (stationary state).Infer the reading of temperature difference heat galvanic couple then with epitaxial method, obtain the stable tangent a at inclination angle
*, constant b and determine the surface temperature t of cupola well one side carbon brick down
*(wearing and tearing) temperature value raises when liner is ablated, and tangent of an angle changes.
Determine the outer limit of liner according to new numerical value, used calculating formula is as follows:
Liner periphery and height every bit are all measured the variation (following cupola well one side) of outer limit, according to this variation, can recover the outline shape of basque under moment any time.
Be with being appreciated that, more than about specific descriptions of the present invention, only be used to the present invention is described and be not to be subject to the described technical scheme of the embodiment of the invention, those of ordinary skill in the art is to be understood that, still can make amendment or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as satisfy, all within protection scope of the present invention.
The reference inventory
1、Э.А.Иодкоидр.《Моделирование?тепловых?процессов?вметаллургии》жулнал《Металлургия》，Москва，197год，страницы89-97。
2、Диагностирование?состояния?футеровки?металлоприемкникадоменных?печей?по?типовым?нагрузкам(Е.Е.Гаврилов，А.Г.Ульянов，В.В.Канаев?идр.)Сталь，1987?№1，c.13-15。
3、Макиенко?В.Г.идругие.Авторское?свидетельство?на?изобретение№1170784《Горн?доменной печи》。
4、Xianglin?I.，Rogioao?T.，Kezhong?G.，Ironmaking?Conference?Proceedings，1996，№556?c.153-157.Англ。
Claims (7)
1. adopt thermopair to measure lining temperature and at the bottom of diagnosing State of Blast Furnace, reach the method for basque situation down, it is characterized in that, carry out successively as follows:
I, utilize thermopair to measure furnace bottom and the temperature in the whole liner of cupola well down;
Ii, infer the reading of thermopair in the step I and determine the described steady state temperature on cupola well one sidelining surface down with epitaxial method, determine that simultaneously the lining temperature rational curve stablize the tangent at inclination angle, lining temperature limits the variation of coordinate then definite with following formula outward:
Wherein: t
*Steady state temperature for liner;
a
*Stablize the tangent at inclination angle for the lining temperature curve;
Xo is the former point coordinates of outer limit;
B is the vertical displacement of lining temperature curve among the coordinate t-x;
Iii, limit the symbol of coordinate changes delta L to determine whether liner weares and teares outward or the wall slag increases according to described liner.
2. employing thermopair measurement lining temperature according to claim 1 reaches the method for basque situation down at the bottom of diagnosing State of Blast Furnace, it is characterized in that: each puts quantity n 〉=3 of thermopair on following basque is axial.
3. employing thermopair according to claim 2 is measured lining temperature and reach the method for basque situation down at the bottom of being diagnosed State of Blast Furnace, and it is characterized in that: described thermopair adopts the standard thermopair.
4. employing thermopair according to claim 3 is measured lining temperature and reach the method for basque situation down at the bottom of being diagnosed State of Blast Furnace, and it is characterized in that: described thermopair is provided with protective sleeve.
5. employing thermopair according to claim 4 is measured lining temperature and reach the method for basque situation down at the bottom of being diagnosed State of Blast Furnace, and it is characterized in that: described protective sleeve adopts stainless steel or silica fiber sheath.
6. employing thermopair according to claim 5 is measured lining temperature and reach the method for basque situation down at the bottom of being diagnosed State of Blast Furnace, and it is characterized in that: described protective sleeve is furnished with protective coating outward.
7. employing thermopair according to claim 6 is measured lining temperature and reach the method for basque situation down at the bottom of being diagnosed State of Blast Furnace, it is characterized in that: described protective coating adopts copper or anti-chilling and shock heating lacquer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010125879.4A CN101798609A (en) | 2010-03-17 | 2010-03-17 | Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth |
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|---|---|---|---|
| CN201010125879.4A CN101798609A (en) | 2010-03-17 | 2010-03-17 | Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth |
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| CN201010125879.4A Pending CN101798609A (en) | 2010-03-17 | 2010-03-17 | Method for measuring lining temperature by adopting thermo-couple to diagnose lining conditions of blast-furnace bottom and lower hearth |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965461A (en) * | 2012-12-24 | 2013-03-13 | 营口戴斯玛克科技发展有限公司 | Device for diagnosing blast-furnace hearth lining |
| CN105074371A (en) * | 2013-04-12 | 2015-11-18 | 里弗雷克特里知识产权两合公司 | Method for determining the state of a fire-resistant lining of a metallurgical vessel for molten metal in particular |
| CN112226561A (en) * | 2020-10-10 | 2021-01-15 | 鞍钢股份有限公司 | Blast furnace lining monitoring method based on impact echo method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2044058C1 (en) * | 1993-01-18 | 1995-09-20 | Курунов Иван Филиппович | Method for control of erosion of blast-furnace well |
| CN101457268A (en) * | 2009-01-07 | 2009-06-17 | 北京首钢自动化信息技术有限公司 | Monitoring, prediction and alarm system for blast furnace hearth and bottom |
-
2010
- 2010-03-17 CN CN201010125879.4A patent/CN101798609A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2044058C1 (en) * | 1993-01-18 | 1995-09-20 | Курунов Иван Филиппович | Method for control of erosion of blast-furnace well |
| CN101457268A (en) * | 2009-01-07 | 2009-06-17 | 北京首钢自动化信息技术有限公司 | Monitoring, prediction and alarm system for blast furnace hearth and bottom |
Non-Patent Citations (1)
| Title |
|---|
| 《炼铁》 19871231 宋木森等 高炉炉身砖衬厚度监测方法的研究及应用 第22-25页 1-7 , 第2期 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965461A (en) * | 2012-12-24 | 2013-03-13 | 营口戴斯玛克科技发展有限公司 | Device for diagnosing blast-furnace hearth lining |
| CN105074371A (en) * | 2013-04-12 | 2015-11-18 | 里弗雷克特里知识产权两合公司 | Method for determining the state of a fire-resistant lining of a metallurgical vessel for molten metal in particular |
| CN105074371B (en) * | 2013-04-12 | 2017-07-28 | 里弗雷克特里知识产权两合公司 | It is used in particular for the method for the state of the refractory liner of the metallurgical furnace of fusing metal for determination |
| CN112226561A (en) * | 2020-10-10 | 2021-01-15 | 鞍钢股份有限公司 | Blast furnace lining monitoring method based on impact echo method |
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Application publication date: 20100811 |