CN113175813A - Method for controlling oxidation burning loss of billet of annular heating furnace - Google Patents
Method for controlling oxidation burning loss of billet of annular heating furnace Download PDFInfo
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- CN113175813A CN113175813A CN202110404877.7A CN202110404877A CN113175813A CN 113175813 A CN113175813 A CN 113175813A CN 202110404877 A CN202110404877 A CN 202110404877A CN 113175813 A CN113175813 A CN 113175813A
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- furnace
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- temperature
- heating
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 50
- 230000003647 oxidation Effects 0.000 title claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 16
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
- F27B13/06—Details, accessories, or equipment peculiar to furnaces of this type
- F27B13/14—Arrangement of controlling, monitoring, alarm or like devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Heat Treatment Processes (AREA)
- Tunnel Furnaces (AREA)
Abstract
A method for controlling the oxidation and burning loss of steel billets in an annular heating furnace comprises the steps of installing a laser atmosphere analyzer in each heating section and each soaking section of the annular heating furnace, dynamically measuring the oxygen concentration and the carbon monoxide concentration in the atmosphere in the furnace, associating the detection result of the laser atmosphere analyzer with a secondary adjusting system of the annular heating furnace, setting a dynamic adjusting and controlling model of furnace atmosphere and temperature, and dynamically adjusting the furnace atmosphere according to different temperature sections. The invention can dynamically monitor and accurately regulate and control the atmosphere of each section in the annular heating furnace in real time, and realizes the minimum oxidation burning loss of the steel billet and the maximum utilization of the heat energy efficiency of fuel gas by controlling the atmosphere in the furnace.
Description
Technical Field
The invention relates to the technical field of seamless steel tube production, in particular to a method for controlling billet oxidation burning loss of an annular heating furnace, which is a process technology for heating a tube blank in the annular heating furnace and controlling the atmosphere in the furnace.
Background
With the increasingly prominent supply and demand contradiction of the steel industry in China, the survival and development of steel enterprises are seriously influenced by the high-order loitering of the price of iron ore and the increasingly intensified competition of the steel market. Therefore, various domestic steel enterprises actively explore how to reduce cost and improve efficiency. The serious oxidation burning loss of the steel billet is always a difficult problem which puzzles the production of a heating furnace in a steel mill, and the existence of the oxidation burning loss not only greatly reduces the yield of the steel billet, but also causes a series of hazards of reducing the thermal efficiency of the heating furnace, reducing the heating speed of the steel billet, aggravating the corrosion of furnace bottom refractory materials, shortening the service life of a furnace body and the like. The reduction of the oxidation burning loss of the steel billet in the furnace by the new potential becomes the central part of the production of the heating furnace of the steel mill.
The factors causing billet oxidation burning loss are many, heating temperature, heating time, heating atmosphere in the furnace, billet components and the like, in order to ensure production rhythm, meet contract requirements and the like in actual production, only the atmosphere in the furnace can be really adjusted in the annular heating furnace, and the traditional adjusting method is 'air-fuel ratio + temperature' adjustment and is greatly influenced by gas heat value fluctuation. Some manufacturers have the auxiliary adjustment of residual oxygen detection in the preheating section, and the accurate adjustment and control cannot be carried out on the actual combustion condition of each section. Therefore, a method for controlling the oxidation burning loss of the steel billet, which can adapt to the heating characteristics of the annular heating furnace, is needed.
Patent document No. CN201110191974.9 (method for regulating and controlling atmosphere field of heating furnace), the method is to detect flame radiant energy signals of each section of the heating furnace, and calculate a reasonable air/fuel ratio, because the detected flame gray scale cannot directly reflect the atmosphere of the actual tube blank, and the actual carbon monoxide and oxygen, etc. inside the furnace chamber cannot be quantitatively detected, and further cannot be accurately regulated.
Patent document CN201810147728.5 (a method for adjusting the atmosphere in a steel rolling heating furnace) describes that the residual oxygen in the preheating section is monitored and adjusted according to the specific value. The measured value is the residual oxygen of the preheating section, the measured value is an accumulation process from the concentration of the residual oxygen of each section to the preheating section, the actual atmosphere condition of each section cannot be truly reflected, the residual oxygen of the high-temperature section is too high, the residual oxygen of the low-temperature section is insufficient, the adjustment process is integral adjustment, and the accurate independent adjustment of each section cannot be carried out, so the atmosphere in the furnace cannot be accurately controlled, and the contribution to burning loss control is small.
Disclosure of Invention
The invention aims to provide a method for controlling the oxidation burning loss of steel billets in an annular heating furnace, which is used for dynamically monitoring and accurately regulating and controlling the atmosphere of each section in the annular heating furnace in real time, and realizes the lowest oxidation burning loss of the steel billets and the maximization of the utilization efficiency of gas heat energy by controlling the atmosphere in the furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for controlling oxidation burning loss of ring heating furnace steel billet is to dynamically adjust the hearth atmosphere according to different temperature sections, and specifically comprises the following steps:
1) the soaking section of the annular heating furnace is a high-temperature section, the atmosphere control of the annular heating furnace needs to be a reducing atmosphere, the oxygen concentration in the furnace needs to be controlled to be 0.5-1.55%, and the carbon monoxide concentration needs to be more than or equal to 1400 ppm;
2) the third heating section is a third heating section of the billet, the atmosphere control of the third heating section is necessarily reducing atmosphere, and the control key point of the third heating section is that the billet does not further oxidize a matrix, so the oxygen concentration in the furnace is necessarily controlled to be 0.9-1.8%, and the carbon monoxide concentration is not less than 1000 ppm;
3) the second heating section is the second temperature rising section of the billet, the temperature of the second heating section is in the violent oxidation stage of the billet, therefore, the atmosphere control is required to be a weak reducing atmosphere, the atmosphere control can be neutral or weak oxidation atmosphere in consideration of the inflow of the excessive coal gas in the soaking section and the third heating section, so that a layer of compact iron scale (mainly ferroferric oxide) is rapidly formed on the surface of the billet, and the further oxidation of the billet is organized. Therefore, the oxygen concentration is controlled to be 1.5-2.0%, and the carbon monoxide concentration must be more than or equal to 650 ppm;
4) the first heating section is a first temperature rise section of the blank, the blank is preheated from a cold blank to more than 1000 ℃, at the moment, because the blank is in a rapid heat absorption process and the oxidation of the blank is not severe at the temperature, the furnace atmosphere can be controlled in an oxidation atmosphere, the oxygen concentration in the furnace can be controlled to be 2.1-4.2%, and the carbon monoxide concentration is more than or equal to 200 ppm.
And installing laser atmosphere analyzers in each heating section and soaking section of the annular heating furnace, dynamically measuring the oxygen concentration and the carbon monoxide concentration in the furnace atmosphere, associating the detection result of the laser atmosphere analyzers with a secondary adjustment system of the annular heating furnace, and setting a dynamic adjustment control model of furnace atmosphere and temperature to realize the dynamic adjustment of the furnace atmosphere.
The measurement precision of the laser atmosphere analyzer reaches 0.0001%.
The dynamic adjusting control model of 'hearth atmosphere + temperature' is adjusted according to control parameters such as set temperature, oxygen concentration detection, carbon monoxide concentration detection, and the specific scheme is as follows:
1) the priority oxygen concentration of each parameter is more than the hearth temperature and more than the carbon monoxide concentration;
2) adjusting the control process model;
3) situation determination and adjustment scheme
Note: "+" is higher than the set value, "-" is lower than the set value;
compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the laser atmosphere analyzer is introduced firstly through regulating the atmosphere in the furnace, so that the atmosphere in each heating section and soaking section can be detected in real time, particularly, the concentration of critical oxygen and carbon monoxide is detected in real time and dynamically adjusted, the atmosphere fluctuation caused by the fluctuation of the heat value of fuel gas is avoided, the method is better than an atmosphere control mode disclosed in the patent document with the application number of CN201110191974.9, and the oxidation burning loss of the steel billet can be reduced to the maximum extent;
2) the atmosphere control performed by the invention is independent adjustment and control of each heating section and soaking section, which is more accurate than the method of adjusting only by using a preheating section oxygen residue instrument disclosed in the patent document with the application number of CN201810147728.5, realizes independent adjustment and control of a high-temperature section and a low-temperature section, reduces the severe oxidation process of the blank at high temperature to the maximum extent, and realizes maximization of fuel heat energy utilization because the detection and control of carbon monoxide concentration are realized.
Detailed Description
The following examples further illustrate embodiments of the present invention.
The embodiment of the invention is implemented on the premise of the technical scheme of the invention, two sets of annular heating furnaces of a certain plant are used for heating billets of the same steel type and the same billet diameter for comparison, the comparative example is steel burning according to the traditional air-fuel ratio control scheme, and the oxidation burning loss of the billets is measured by a weighing method after the billets are heated, wherein the process scheme is shown in a table 1, and the actual oxidation burning loss result of the billets is shown in a table 2.
TABLE 1 Process schemes for examples of the invention and comparative examples
Note: comparative examples 1 to 3 were adjusted to air-fuel ratios.
TABLE 2 oxidation burning of steel billets in examples and comparative examples of the present invention
| Examples of the invention | Oxidation burning loss of steel billet% |
| 1 | 1.35 |
| 2 | 1.42 |
| 3 | 1.58 |
| Comparative example 1 | 1.65 |
| Comparative example 2 | 1.77 |
| Comparative example 3 | 1.98 |
。
Claims (3)
1. The utility model provides a ring heater steel billet oxidation burning loss control method, its characterized in that installs laser atmosphere analysis appearance at each heating zone of ring heater and soaking section, carries out dynamic measurement to oxygen concentration and carbon monoxide concentration in the stove atmosphere to carry out laser atmosphere analysis appearance testing result and ring heater second grade adjustment system and carry out the relevance, sets out "furnace atmosphere + temperature" dynamic adjustment control model, carries out dynamic adjustment with furnace atmosphere according to different temperature sections, specifically does:
1) the soaking section of the annular heating furnace is a high-temperature section, the oxygen concentration in the furnace is controlled to be 0.5-1.55%, and the carbon monoxide concentration is more than or equal to 1400 ppm;
2) the third heating section is a third temperature rise section of the blank, the oxygen concentration in the furnace is controlled to be 0.9-1.8%, and the carbon monoxide concentration is more than or equal to 1000 ppm;
3) the second heating section is a second temperature rising section of the blank, the oxygen concentration is controlled to be 1.5-2.0%, and the carbon monoxide concentration is more than or equal to 650 ppm;
4) the first heating section is the first temperature raising section of the blank, the oxygen concentration in the furnace is controlled to be 2.1-4.2%, and the carbon monoxide concentration is more than or equal to 200 ppm.
2. The method for controlling the oxidation burning loss of the ring heating furnace steel billet according to the claim 1, characterized in that the measurement accuracy of the laser atmosphere analyzer reaches 0.0001%.
3. The method of claim 1, wherein the billet is heated to a temperature of 1000 ℃ or higher in the first heating zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404877.7A CN113175813A (en) | 2021-04-15 | 2021-04-15 | Method for controlling oxidation burning loss of billet of annular heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404877.7A CN113175813A (en) | 2021-04-15 | 2021-04-15 | Method for controlling oxidation burning loss of billet of annular heating furnace |
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| Publication Number | Publication Date |
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| CN113175813A true CN113175813A (en) | 2021-07-27 |
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| CN202110404877.7A Withdrawn CN113175813A (en) | 2021-04-15 | 2021-04-15 | Method for controlling oxidation burning loss of billet of annular heating furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146458A (en) * | 2020-09-09 | 2020-12-29 | 武汉钢铁有限公司 | Method for improving yield of low-carbon high-microalloyed steel |
-
2021
- 2021-04-15 CN CN202110404877.7A patent/CN113175813A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112146458A (en) * | 2020-09-09 | 2020-12-29 | 武汉钢铁有限公司 | Method for improving yield of low-carbon high-microalloyed steel |
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Application publication date: 20210727 |