CN104046770A - Method for controlling uniformity of temperature field of heating furnace - Google Patents
Method for controlling uniformity of temperature field of heating furnace Download PDFInfo
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- CN104046770A CN104046770A CN201410277501.4A CN201410277501A CN104046770A CN 104046770 A CN104046770 A CN 104046770A CN 201410277501 A CN201410277501 A CN 201410277501A CN 104046770 A CN104046770 A CN 104046770A
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Abstract
The invention relates to a method for controlling uniformity of a temperature field of a heating furnace. A heating process of the heating furnace comprises a preheating section, a heating section I, a heating section II and a soaking section, wherein temperatures of an inner wall and an outer wall of a furnace wall are controlled in the preheating section and the heating section I. The method for controlling the uniformity of the temperature field of the heating furnace is characterized in that control on temperature of a furnace top is added in the heating section II to the soaking section, a stable temperature field for three points of the furnace top, the inner wall and the outer wall of the furnace wall is formed, and the temperature of the furnace top in the heating section II to the soaking section is controlled to be ranged from technological lower limit to technological upper limit plus 5 DEG C. The method for controlling the uniformity of the temperature field of the heating furnace has the advantages that circumferential temperature uniformity of wheels subjected to heat treatment in an annular heating furnace for wheel heat treatment is reduced to 15 DEG C from 30 DEG C in temperature difference, key indexes such as fracture toughness and low temperature impact of the wheels subjected to heat treatment are effectively improved under the same conditions, and requirements of heat treatment on high speed wheels are met.
Description
Technical field
The invention belongs to the production control field of railway rolled steel wheel, relate to a kind of control method of furnace temp field uniformity, be specifically related to a kind of heat treatment furnace temperature homogeneity of improving, meet the heat treated course control method for use of high request railway wheel.
Background technology
Along with the development of state, inside and outside high-speed rail technology, high-speed wheel becomes one of important high-end product that domestic and international manufacturing enterprise competitively develops.And be not only key index at high-speed wheel performance history wheel rim fracture toughness property, low-temperature impact toughness, be also technological difficulties.
Want to meet speed car wheel rim fracture toughness property, low-temperature impact toughness requirement, except design of material, steel-making, continuous casting etc., in heat-treatment quenching heat-processed, Uniformity of Temperature Field is most important, if temperature homogeneity can not meet, there will be the fluctuation of above-mentioned key index and defective.Ma Gang is exactly uneven owing to existing wheel heat to process circumferential temperature at the high-speed wheel development initial stage, causes above-mentioned key index not meet the demands.
Summary of the invention
The present invention processes on the basis of annular heating furnace equipment at existing wheel heat, and a kind of control method of furnace temp field uniformity is provided, and improves furnace temp field uniformity, meets the heat treatment requirements of high request railway wheel.Concrete technical scheme is as follows:
A kind of control method of furnace temp field uniformity, the heating steps of described process furnace is divided into preheating section, heating I section, hot II section, and soaking zone, the temperature at preheating section with heating I section control furnace wall inwall, outer wall, increases the control to throat temperature at described hot II section to soaking zone, form the stable temperature field in furnace wall inwall, outer wall, 3 cross sections of furnace roof, by being controlled within the scope of the technique lower limit～technique upper limit+5 ℃ of II section-soaking zone throat temperature.
Further, in controling of the pressure of the oven, burner pressure-controlling is at 3-6Pa.
Further, wind coal proportion is controlled at and is greater than 3:1.
Further, described process furnace is for the heat treated rotary heating furnace of railway wheel.
Further, furnace wall inwall, outer wall arrange that thermopair carries out control process thermometric.
Compare with currently available technology, the circumferential temperature homogeneity that the present invention can make wheel heat process thermal treatment wheel in rotary heating furnace is dropped in 15 ℃ of temperature difference by 30 ℃ of temperature difference, under equal conditions make fracture toughness property, the low-temperature impact key index of thermal treatment rear wheel effectively improve, met high-speed wheel heat treatment requirements.
Accompanying drawing explanation
Fig. 1 is the wheel circumferentially temperature variations in kind recording under conventional control method
Fig. 2 is the wheel circumferentially temperature variations in kind recording under control method of the present invention
Fig. 3 is that thermopair is arranged signal
Fig. 4 is surveyed circumferentially temperature curve in kind before implementing by 4# stove
Fig. 5 is surveyed circumferentially temperature curve in kind after implementing by 4# stove
Fig. 6 is surveyed circumferentially temperature curve in kind before implementing by 7# stove
Fig. 7 is surveyed circumferentially temperature curve in kind after implementing by 7# stove
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
A kind of control method of improving wheel furnace temp field uniformity:
1) include throat temperature in span of control;
2) adopt larger malleation to burn steel (burner pressure 3-6Pa);
3) wind coal proportion is greater than 3:1
Illustrate the content of technical solution of the present invention below:
1) generally, rotary heating furnace only arranges that at the interior outer side wall of each heating zone thermopair carries out control process thermometric, but this often can not guarantee the temperature homogeneity requirement of thermal treatment wheel, even in the soaking later stage, there will be temperature in kind sharply to rise.By increasing the control to heating II section-soaking zone throat temperature, can form so the stable temperature field in furnace wall inwall, outer wall, 3 cross sections of furnace roof, improve and guarantee the homogeneity of temperature in kind in effective heating area.Therefore the present invention's being controlled within the scope of the technique lower limit～technique upper limit+5 ℃ II section-soaking zone throat temperature.
2) in a sense, annular furnace is just as the encloses container of a back-off, encloses container is only full of furnace gas guarantee burner hearth airflow convection and full and uniform, and adopting malleation to burn steel is exactly the furnace gas degree of filling increasing in burner hearth, thereby improves the homogeneity in temperature field.But consider from another point of view, if furnace pressure too conference damage furnace binding and cause equipment damage, so the present invention by burner pressure-controlling at 3-6Pa, not only guaranteed temperature uniformity but also will reduce to the damage of furnace equipment minimum.
3) from Combustion, can learn, if wind coal proportion is too small, have superfluous coal gas after burner combustion, superfluous coal gas secondary combustion in burner hearth, will bring difficulty to the control of throat temperature, so the present invention be controlled at wind coal proportion to be greater than 3:1.
Adopt DataPaq In-Line Temperature Measure System to measure relatively heat-processed wheel under different control methods and furnace temperature changing conditions.
Wheel for thermometric is 890mm wheel, 90 ° of 5mm pre-buried 4 thermopairs of holing under tread along circumferential interval, measure respectively wheel along process furnace radially (interior ring, outer shroud) and the circumferential temperature of (burner, stove tail), be used for evaluating wheel heating uniformity, thermopair is arranged and is seen Fig. 3.
In addition, with near the furnace gas temperature 1 thermocouple assay wheel, for evaluating the consistence of accuracy, representativeness and furnace temperature-steel temperature of process furnace temperature control thermopair.
In order to confirm validity and the replicability of this kind of control method, we select respectively and have done two seat coach wheel rotary heating furnaces and do the contrast before and after implementing, and are described in detail as follows.
Embodiment 1: at 4# rotary heating furnace, do the test of contrast thermometric
From detected result: in this invention technology not use, although each electric thermo-couple temperature of furnace wall is controlled in processing range, but actual furnace gas temperature fluctuation is larger, cause significantly raising in soaking later stage temperature in kind, even surpass the technology controlling and process upper limit (Fig. 4).Adopt after this patent of invention, actual furnace gas temperature is effectively controlled, although there is certain fluctuation, equal stable being controlled in 15 ℃ in add at II-soaking of circumferential temperature region in kind, and meet technique bound and require (Fig. 5).
Embodiment 2: at 7# rotary heating furnace, do the test of contrast thermometric
From detected result: in this invention technology not use, although each electric thermo-couple temperature of furnace wall sidewall is controlled in processing range, but actual furnace gas temperature fluctuation is larger, in preheating section, heating I section, heating II section, all there is high point respectively, cause wheel in kind between heating II section and soaking zone, to surpass the process stipulation upper limit, time more than 20min, approximately 20 ℃ of overtemperatures; In the soaking zone second half section, wheel temperature also declines to some extent, approaches technology controlling and process lower limit (Fig. 6).Adopt after this patent of invention, actual furnace gas temperature is effectively controlled, although there is certain fluctuation, equal stable being controlled in 15 ℃ in add at II-soaking of circumferential temperature region in kind, and meet technique bound and require (Fig. 7).
Compared with prior art, the present invention has obtained following beneficial effect: by the application of control techniques of the present invention, the circumferential temperature extreme difference of thermal treatment wheel between soaking period in process furnace is contracted in 15 ℃ by being greater than 30 ℃, met high request wheel key technical index (fracture toughness property, low-temperature impact) to the inhomogeneity requirement of heat treatment furnace temperature.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (5)
1. the control method of a furnace temp field uniformity, the heating steps of described process furnace is divided into preheating section, heating I section, hot II section, and soaking zone, the temperature at preheating section with heating I section control furnace wall inwall, outer wall, it is characterized in that, at described hot II section to soaking zone, increase the control to throat temperature, form the stable temperature field in furnace wall inwall, outer wall, 3 cross sections of furnace roof, by being controlled within the scope of the technique lower limit～technique upper limit+5 ℃ of II section-soaking zone throat temperature.
2. the control method of furnace temp field uniformity as claimed in claim 1, is characterized in that, in controling of the pressure of the oven, burner pressure-controlling is at 3-6Pa.
3. the control method of furnace temp field uniformity as claimed in claim 1 or 2, is characterized in that, wind coal proportion is controlled at and is greater than 3:1.
4. the control method of the furnace temp field uniformity as described in any one in claim 1-3, is characterized in that, described process furnace is for the heat treated rotary heating furnace of railway wheel.
5. the control method of the furnace temp field uniformity as described in any one in claim 1-4, is characterized in that, furnace wall inwall, outer wall arrange that thermopair carries out control process thermometric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410277501.4A CN104046770A (en) | 2014-06-19 | 2014-06-19 | Method for controlling uniformity of temperature field of heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410277501.4A CN104046770A (en) | 2014-06-19 | 2014-06-19 | Method for controlling uniformity of temperature field of heating furnace |
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| CN104046770A true CN104046770A (en) | 2014-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827015A (en) * | 2018-08-16 | 2018-11-16 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of hollow horizontal heater and its control system and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775475A (en) * | 2010-02-03 | 2010-07-14 | 无锡西姆莱斯石油专用管制造有限公司 | Hot-rolled tube billet heating process |
| CN102175082A (en) * | 2010-12-22 | 2011-09-07 | 苏州新长光热能科技有限公司 | Nonlinear correction system used for box-type heating furnace temperature field thermocouple |
| CN102828017A (en) * | 2012-09-14 | 2012-12-19 | 南京钢铁股份有限公司 | Heating process of wire rod for tyre bead steel wire |
-
2014
- 2014-06-19 CN CN201410277501.4A patent/CN104046770A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775475A (en) * | 2010-02-03 | 2010-07-14 | 无锡西姆莱斯石油专用管制造有限公司 | Hot-rolled tube billet heating process |
| CN102175082A (en) * | 2010-12-22 | 2011-09-07 | 苏州新长光热能科技有限公司 | Nonlinear correction system used for box-type heating furnace temperature field thermocouple |
| CN102828017A (en) * | 2012-09-14 | 2012-12-19 | 南京钢铁股份有限公司 | Heating process of wire rod for tyre bead steel wire |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827015A (en) * | 2018-08-16 | 2018-11-16 | 广东省计量科学研究院（华南国家计量测试中心） | A kind of hollow horizontal heater and its control system and control method |
| CN108827015B (en) * | 2018-08-16 | 2023-11-07 | 广东省计量科学研究院（华南国家计量测试中心） | Hollow horizontal heating furnace and control system and control method thereof |
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Application publication date: 20140917 |