CN109187889A - For obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere - Google Patents

For obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere Download PDF

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Publication number
CN109187889A
CN109187889A CN201811366503.5A CN201811366503A CN109187889A CN 109187889 A CN109187889 A CN 109187889A CN 201811366503 A CN201811366503 A CN 201811366503A CN 109187889 A CN109187889 A CN 109187889A
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CN
China
Prior art keywords
furnace
test
heating
steel plate
obtaining
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CN201811366503.5A
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Chinese (zh)
Inventor
肖利
黎建明
刘勇
刘建华
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Priority to CN201811366503.5A priority Critical patent/CN109187889A/en
Publication of CN109187889A publication Critical patent/CN109187889A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/04Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder

Abstract

The invention discloses a kind of for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, belongs to steel rolling production process method and technology field.A kind of test method for being used to obtain large-scale walking beam type heating furnace furnace atmosphere that can accurately obtain the heating optimal heating furnace furnace atmosphere of burn out rate is provided.The test method includes the following steps, a, determine the oxygen content in high-temperature heating section furnace, b, select three to five heating steel sheets to vary in weight, cross the weight for claiming and recording each steel plate, c, each part steel plate is respectively fed to stove heating, furnace atmosphere parameter is obtained by furnace atmosphere control device after steel plate sequence enters bringing-up section and soaking zone, and it extracts inner flue gas of the stove and analyzes its ingredient, d, cool down dephosphorization respectively after steel plate is come out of the stove, cross the weight after claiming and recording each steel plate heating, e, it calculates, compare the furnace atmosphere parameter completion experiment work for obtaining that minimum group steel plate of burn out rate.

Description

For obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere
Technical field
The present invention relates to a kind of test methods, more particularly, to one kind for obtaining gas in large-scale walking beam type heating-furnace The test method of atmosphere belongs to steel rolling production process method and technology field.
Background technique
It needs to heat slab by walking beam heating furnace before Hot Rolling Strip, is then delivered to milling train progress Rolling.Heating furnace heats slab by gas-fired mode, just shows in this combustion process to the control climate in heating furnace It obtains particularly important.The atmosphere of heating furnace is mainly two kinds: one is oxidizing atmospheres, with O2、CO2、H2O ... waits the mixed atmospheres to be Main, another kind is reducing atmosphere, based on CO atmosphere.Oxidizing atmosphere will cause hot rolling slab oxidization burning loss, aggravation it is resistance to The consumption of material;Reducing atmosphere has effect to protection slab oxidation, but will cause coal gas waste, while being also unfavorable for steel slab surface Defect be oxidized after removal.Using weak oxide atmosphere be traditional heating furnace production pursue target, but how stable realization It each manufacturing enterprise exploratory development always and the problem that is difficult to realize that control and quantization, which are steel production industries,.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of can accurately obtain heats the optimal heating-furnace of burn out rate The test method for being used to obtain large-scale walking beam type heating furnace furnace atmosphere of interior atmosphere.
Used technical solution is to solve above-mentioned technical problem: one kind is for obtaining large-scale walking beam type heating-furnace The test method of interior atmosphere, the test method include the following steps,
A, the oxygen content in high-temperature heating section furnace is determined,
B, three to five heating steel sheets to vary in weight are selected, the weight for claiming and recording each steel plate is crossed,
C, each part steel plate is respectively fed to stove heating, passes through heating furnace gas after steel plate sequence enters bringing-up section and soaking zone Atmosphere control device obtains furnace atmosphere parameter, and extracts inner flue gas of the stove and analyze its ingredient,
D, it cools down dephosphorization respectively after steel plate is come out of the stove, crosses the weight after claiming and recording each steel plate heating,
E, it calculates, compare the furnace atmosphere parameter completion experiment work for obtaining that minimum group steel plate of burn out rate,
Wherein, in c and d step, each part steel plate respectively individually enters heating furnace and is heated and obtain furnace atmosphere parameter With inner flue gas of the stove ingredient.
Further, the oxygen content being heated at high temperature in section furnace is obtained by test, or passes through statistics in step a Data obtain.
The preferred mode of the above solution is that in step c, the furnace atmosphere parameter that is obtained by furnace atmosphere control device Including air-fuel ratio, furnace pressure, calorific value of gas and gas pressure.
Further, the flue gas in furnace is extracted by the copper pipe in insertion heating furnace top thermocouple hole in step c , the flue gas extracted is re-fed into flue gas analyzer after cooling by water and carries out oxygen content value in analysis acquisition furnace.
Come the preferred mode of the above solution is that being supplied oxygen when oxygen content value is not up to step a specified value It is adjusted.
Further, in step a, content≤3% of bringing-up section oxygen, content≤1% of soaking zone oxygen.
The preferred mode of the above solution is that the measurement range of flue gas analyzer and required precision are as follows in step c:
Measure component Measurement range Resolution ratio Precision
O2 0~25.00% 0.01% ± 0.2%FS
CO 0~10% 0.01% ± 2%FS
The beneficial effects of the present invention are: the above-mentioned test method using the application is acquiring plurality of steel plates at different conditions The related datas such as burn out rate under the premise of, can accurately obtain the heating optimal heating of burn out rate by calculating relatively Furnace furnace atmosphere.In the subsequent heating process to slab, by given oxygen supply, the air-fuel ratio for giving gas and giving, furnace Pressure, calorific value of gas and gas pressure etc. can be obtained the preferable heating furnace furnace atmosphere of burn out rate, both guarantee the heating of slab Effect, and heating cost is reduced as far as possible.
Detailed description of the invention
Fig. 1 is the present invention for obtaining the process flow that the test method of large-scale walking beam type heating furnace furnace atmosphere is related to Schematic diagram.
Specific embodiment
It is asked to solve above-mentioned technology topic in the prior art, it is provided by the invention a kind of accurately to obtain heating burn out rate The test method for being used to obtain large-scale walking beam type heating furnace furnace atmosphere of optimal heating furnace furnace atmosphere.The test Method includes the following steps,
A, the oxygen content in high-temperature heating section furnace is determined,
B, three to five heating steel sheets to vary in weight are selected, the weight for claiming and recording each steel plate is crossed,
C, each part steel plate is respectively fed to stove heating, passes through heating furnace gas after steel plate sequence enters bringing-up section and soaking zone Atmosphere control device obtains furnace atmosphere parameter, and extracts inner flue gas of the stove and analyze its ingredient,
D, it cools down dephosphorization respectively after steel plate is come out of the stove, crosses the weight after claiming and recording each steel plate heating,
E, it calculates, compare the furnace atmosphere parameter completion experiment work for obtaining that minimum group steel plate of burn out rate,
Wherein, in c and d step, each part steel plate respectively individually enters heating furnace and is heated and obtain furnace atmosphere parameter With inner flue gas of the stove ingredient.The phases such as the burn out rate using the above-mentioned test method of the application in acquisition plurality of steel plates at different conditions Under the premise of closing data, the heating optimal heating furnace furnace atmosphere of burn out rate can be accurately obtained by calculating relatively. In the subsequent heating process to slab, by given oxygen supply, the air-fuel ratio for giving gas and giving, furnace pressure, coal gas heat Value and gas pressure etc. can be obtained the preferable heating furnace furnace atmosphere of burn out rate, not only guarantee the heating effect of slab, but also as far as possible Reduce heating cost.
In above embodiment oxygen content of the application in the high-temperature heating section furnace in step a using pass through examination Acquisition is tested, or obtained by statistical data, to improve the efficiency that test obtains accurate heating furnace furnace atmosphere.At this point, this Shen Please in oxygen content successively are as follows: content≤3% of bringing-up section oxygen, content≤1% of soaking zone oxygen.In test process In, oxygen supply is carried out when oxygen content value is not up to step a specified value to be adjusted.
Meanwhile parameters amount as far as possible accurate, practical in order to obtain the test method of the application, and as far as possible Consistent with state when practical heat, in step c, the furnace atmosphere parameter obtained by furnace atmosphere control device includes Air-fuel ratio, furnace pressure, calorific value of gas and gas pressure;Flue gas in furnace is by the thermocouple hole at the top of insertion heating furnace Copper pipe extract, the flue gas extracted be re-fed into after cooling by water flue gas analyzer carry out analysis obtain furnace in oxygen Gas content value.At this point, the measurement range and precision to flue gas analyzer are by following requirement control:
Measure component Measurement range Resolution ratio Precision
O2 0~25.00% 0.01% ± 0.2%FS
CO 0~10% 0.01% ± 2%FS
In conclusion also being had using the furnace atmosphere that above-mentioned test method provided by the present application obtains heating furnace following excellent Point,
1, the optimum oxygen content that billet oxidization burning loss is reduced under high temperature is determined by laboratory infrastest.
2, it using optimum oxygen content, is tested by Series Industrial and determines the least control model of scaling loss.
3, the present invention provides the methods that a set of comparison accurately controls furnace atmosphere, and oxidization burning loss is most under the atmosphere It is few.
4, the present invention overcomes the drawbacks of Traditional control heating furnace air-fuel ratio, meanwhile, reduce high automatic control and maintenance Investment has the value promoted the use of on all heating furnaces.
Embodiment one
Certain domestic 2,600,000 tons of iron and steel enterprise's heating furnace annual output, heating furnace production status:
Through recommending, furnace atmosphere is controlled using the present invention:
Combination technology scheme, specific implementation step of the invention is as follows, and main flow is shown in attached drawing 1:
1, laboratory determines the optimal oxygen content of high temperature section
2, weighing record is worked as first five and is propped up into furnace steel billet weight:
3, pass through heating furnace length L, heating furnace walking beam step pitch K and times of exercise N, the position of tracking steel billet in heating furnace Set M:
L=46.5m, K=280mm heat fragment position M1=23, soaking fragment position=11
M=L-K*N
4, after steel billet enters bringing-up section, soaking zone, the thermocouple hole position insertion copper pipe suction at the top of heating furnace adds Flue gas in hot stove and by cooling by water, is then fed into flue gas analyzer and is analyzed;
5, de-scaling is carried out after five slabs are come out of the stove and is weighed, and burn out rate is calculated
6, it selects burn out rate least to operate as optimum control, while obtaining corresponding air-fuel ratio, furnace pressure, coal gas Calorific value, gas pressure;
From (5) it can be seen that under conditions of not influencing production, the test of serial number 4, combustion rate is minimum, for this purpose, selection 4 Corresponding operating parameter.
By implementing the invention, can it is simple and effective control heating furnace atmosphere, reduce the oxidization burning loss rate of furnace plate blank, Since the invention is implemented 1 year, enterprise's heating furnace index situation is as follows:
According to 360 tons of steel billet amount meters of the enterprise year heating, then the benefit generated using the invention:
1) gas unit consumption reduces (temperature reduces, and time inside furnace is reduced)
Benefited yield × material price × technical contribution degree-the research and development of (unit consumption after unit consumption-implementation before implementing) × this process are thrown Enter, gas unit consumption is reduced to 1.12GJ/t, 43.59 yuan of mixed gas 1GJ price by 1.19GJ/t;
Benefit: W1=(1.29-1.12) × ten thousand yuan of 260 × 43.59 × 0.6=1156
2) lumber recovery (reducing oxidization burning loss) is promoted
Scaling loss reduction amount × this process is benefited yield × (cost of material-waste recovery value) × technical contribution degree-research and development Put into iron sheet and 2000 yuan/t of certified products price difference.
Benefit: W2=(1.45-1.21) × ten thousand yuan of 260/100 × 2000 × 0.6=748
Then, ten thousand yuan of benefit=W1+W2=1156+748=1904 of invention generation.

Claims (7)

1. a kind of for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, it is characterised in that: the test Method includes the following steps,
A, the oxygen content in high-temperature heating section furnace is determined,
B, three to five heating steel sheets to vary in weight are selected, the weight for claiming and recording each steel plate is crossed,
C, each part steel plate is respectively fed to stove heating, passes through furnace atmosphere control after steel plate sequence enters bringing-up section and soaking zone Device processed obtains furnace atmosphere parameter, and extracts inner flue gas of the stove and analyze its ingredient,
D, it cools down dephosphorization respectively after steel plate is come out of the stove, crosses the weight after claiming and recording each steel plate heating,
E, it calculates, compare the furnace atmosphere parameter completion experiment work for obtaining that minimum group steel plate of burn out rate,
Wherein, in c and d step, each part steel plate respectively individually enters heating furnace and is heated and obtain furnace atmosphere parameter and furnace Interior smoke components.
2. according to claim 1 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature Be: in step a, the oxygen content being heated at high temperature in section furnace is obtained by test, or is obtained by statistical data.
3. according to claim 1 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature Be: in step c, the furnace atmosphere parameter obtained by furnace atmosphere control device includes air-fuel ratio, furnace pressure, coal gas Calorific value and gas pressure.
4. according to claim 3 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature Be: in step c, the flue gas in furnace is extracted by the copper pipe in insertion heating furnace top thermocouple hole, is extracted Flue gas is re-fed into flue gas analyzer after cooling by water and carries out oxygen content value in analysis acquisition furnace.
5. according to claim 4 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature It is: is supplied oxygen when oxygen content value is not up to step a specified value to be adjusted.
6. according to claim 1 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature It is: in step a, content≤3% of bringing-up section oxygen, content≤1% of soaking zone oxygen.
7. according to claim 1 for obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere, feature Be: the measurement range of flue gas analyzer and required precision are as follows in step c:
Measure component Measurement range Resolution ratio Precision O2 0~25.00% 0.01% ± 0.2%FS CO 0~10% 0.01% ± 2%FS
CN201811366503.5A 2018-11-16 2018-11-16 For obtaining the test method of large-scale walking beam type heating furnace furnace atmosphere Pending CN109187889A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
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* Cited by examiner, † Cited by third party
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