CN110819772B - Nitrogen-hydrogen protective gas control method for continuous annealing furnace - Google Patents
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 85
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 85
- 230000001681 protective effect Effects 0.000 title claims abstract description 68
- 239000007789 gas Substances 0.000 title claims abstract description 67
- 238000000137 annealing Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 13
- 238000009792 diffusion process Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 239000011574 phosphorus Substances 0.000 claims description 10
- 238000010583 slow cooling Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002436 steel type Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 8
- 239000003034 coal gas Substances 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 230000000740 bleeding effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a nitrogen-hydrogen protective gas control method for a continuous annealing furnace, which comprises the following steps: 1) setting different furnace pressures and nitrogen-hydrogen protective gas flows according to different varieties; 2) the opening degree of a diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent; 3) the hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion less than or equal to 5 percent: when the nitrogen-hydrogen protective atmosphere in the furnace meets the conditions that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the hydrogen proportion is controlled by adopting the proportion less than or equal to 3 percent; otherwise, the hydrogen proportion is controlled according to the proportion of less than or equal to 5 percent. The advantages are that: on the premise of ensuring the process requirement and the product quality, the use amount and the discharge amount of the nitrogen-hydrogen mixed protective gas are effectively reduced, the utilization rate of the protective gas is improved, and the consumption of nitrogen, hydrogen and coal gas is reduced.
Description
Technical Field
The invention belongs to the field of energy conservation of metallurgical industrial furnaces, and particularly relates to a nitrogen-hydrogen protective gas control method for a continuous annealing furnace.
Background
The cold rolling continuous vertical annealing furnace is the core equipment of a continuous annealing production line, and the recrystallization annealing of the strip steel is finished through the processes of preheating, heating, soaking, cooling, balancing and the like. The annealing furnace plays an important role in the quality and performance of the steel sheet. The continuous vertical annealing furnace is divided into 8 furnace body sections, namely a preheating section, a heating 1 section, a heating 2 section, a slow cooling section, an overaging 1 section, an overaging 2 section, an overaging 3 section and a final cooling section. Except the preheating section, the atmosphere in each other section is reductive protective gas consisting of nitrogen and hydrogen. At present, the control method of the internal atmosphere of the cold rolling continuous vertical annealing furnace in China controls the quality of protective gas according to main indexes such as furnace pressure, dew point, oxygen content and the like. Furnace pressure is an important index of the quality of the atmosphere in the furnace, and stable furnace pressure control is the key for ensuring the quality of protective gas.
The traditional annealing furnace nitrogen-hydrogen protective gas control method in China injects nitrogen-hydrogen protective gas in sections according to the furnace pressure requirement, and the furnace pressure setting of each section is different. At present, in order to ensure the quality of furnace gas, the furnace pressure is set according to the upper limit, the specification and the variety of strip steel are not divided, and meanwhile, the opening degree of each section of automatic bleeding valve and manual bleeding valve and the proportion of nitrogen-hydrogen protective gas are all controlled by the upper limit, so that the waste of the nitrogen-hydrogen protective gas and the heat loss in the furnace are caused.
At present, the method for replacing the atmosphere in the annealing furnace is researched by people at home and abroad, such as: patent CN103555926A, an atmosphere replacement method for a continuous annealing furnace, which quickly replaces the protective atmosphere in the furnace with the required protective atmosphere in the furnace according to the process requirements, thereby completing the adjustment of the protective atmosphere in the furnace, and does not relate to the protective gas optimization control technology.
Related papers are written on the improvement aspect of the furnace atmosphere of the annealing furnace in China, some papers introduce and produce high-end automobile plates to provide excellent furnace atmosphere guarantee, and other papers only explore methods for reducing energy consumption from equipment manufacturing and field installation, and do not provide a clear control method for reducing the consumption of protective gas in the furnace. Such as: the improvement of the furnace atmosphere of the annealing furnace of the cold-rolling continuous hot galvanizing line, and the 1 st stage of 10 months in 2014 of metallurgy; "control measures for energy saving, emission reduction and consumption reduction of continuous annealing furnace", volume 28, 4 th of 8 months in 2011.
At present, the research on nitrogen-hydrogen protective gas in China focuses on how to ensure the product quality, different specifications and varieties are not considered in the continuous annealing line production to adjust the set value of the furnace pressure control system of the annealing furnace, and the opening set value of a furnace area furnace gas diffusion valve, the hydrogen ratio and the like are optimized. Therefore, the control of the protective gas in the traditional annealing furnace inevitably causes higher nitrogen and hydrogen flow, increased heat loss in the furnace and increased gas consumption. Therefore, energy waste can be caused, and the environmental protection problem of increasing the discharge amount of protective gas and smoke exists.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for controlling the nitrogen-hydrogen protective gas of the continuous annealing furnace, which controls the consumption of the protective gas while ensuring the quality of the atmosphere in the furnace, namely the furnace pressure, the dew point and the oxygen content, reduces the heat loss of the atmosphere in the furnace and reduces the gas consumption.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a nitrogen-hydrogen protective gas control method for a continuous annealing furnace comprises the following aspects:
1) different furnace pressures and nitrogen-hydrogen protective gas flows are set according to different varieties:
when producing DP high-strength steel, phosphorus-containing high-strength steel and O5 automobile plates, the furnace pressure of the heating 1 section, the heating 2 section and the slow cooling section of the annealing furnace is controlled according to 250 +/-10 Pa, and the furnace pressure of other sections is controlled according to 220 +/-10 Pa;
when producing common steel except the above steel types, the furnace pressure of the heating 1 section, the heating 2 section and the slow cooling section is controlled according to 220 +/-10 Pa, and other sections are controlled according to 210 +/-10 Pa;
when the thickness of the produced strip steel is more than or equal to 1.5mm, the furnace pressure of the heating 1 section, the heating 2 section and the slow cooling section of the annealing furnace is controlled according to 240 +/-10 Pa, and other sections are controlled according to 210 +/-10 Pa; if the thickness of the strip steel is more than or equal to 1.5mm and the steel types are DP high-strength steel, phosphorus-containing high-strength steel and O5 automobile plates, according to the furnace pressure when the DP high-strength steel, the phosphorus-containing high-strength steel and the O5 automobile plates are produced;
2) the opening degree of a diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent;
3) the hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion less than or equal to 5 percent:
when the nitrogen-hydrogen protective atmosphere in the furnace meets the conditions that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the hydrogen proportion is controlled by adopting the proportion less than or equal to 3 percent; otherwise, the hydrogen proportion is controlled according to the proportion of less than or equal to 5 percent.
In the step 1), when the ordinary steel is transferred to DP high-strength steel, phosphorus-containing high-strength steel or O5 automobile plates, the furnace pressure is adjusted 5-10 minutes ahead of time.
Compared with the prior art, the invention has the beneficial effects that:
on the premise of ensuring the process requirement and the product quality, the invention effectively reduces the usage amount and the discharge amount of the nitrogen-hydrogen mixed protective gas, improves the utilization rate of the protective gas and reduces the consumption of nitrogen, hydrogen and coal gas.
Drawings
FIG. 1 is a schematic view of the furnace pressure control of an annealing furnace.
In the figure: 1-furnace pressure signal 2-controller 3-actually detected furnace pressure signal 4-nitrogen-hydrogen protective gas regulating valve 5-nitrogen-hydrogen protective gas pipeline 6-annealing furnace.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
Example 1:
a method for controlling nitrogen-hydrogen protective gas of a continuous annealing furnace is characterized in that when DP high-strength steel, phosphorus-containing high-strength steel and O5 automobile plates are produced, the requirement on the quality of furnace gas is high due to high product quality requirement, furnace pressures of a heating section 1, a heating section 2 and a slow cooling section of the annealing furnace are controlled according to 250 +/-10 Pa, furnace pressures of other sections are controlled according to 220 +/-10 Pa, the furnace pressures are set in a program, and the flow of the nitrogen-hydrogen protective gas is automatically adjusted according to the set furnace pressure.
See fig. 1, different furnace pressure signals 1 are set for different specifications and varieties, and are transmitted to a controller 2 together with a furnace pressure signal 3 which is actually detected, the controller 2 feeds a pressure difference signal back to a nitrogen-hydrogen protective gas regulating valve 4 on a nitrogen-hydrogen protective gas pipeline 5, after the nitrogen-hydrogen protective gas regulating valve 4 is automatically regulated, the actually detected furnace pressure signal 3 is transmitted to the controller 2 again, until the actual furnace pressure meets the set requirement, the nitrogen-hydrogen protective gas is transmitted to an annealing furnace 6, and closed-loop control is completed.
The opening degree of a diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent; while adjusting the furnace pressure and the flow of the nitrogen-hydrogen protective gas, the opening degree of each section of the bleeding valve (including an automatic bleeding valve and a manual bleeding valve) is also adjusted and controlled according to the percentage less than or equal to 5 percent.
The hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion of less than or equal to 3 percent. When the nitrogen-hydrogen protective atmosphere in the furnace meets the standard that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the proportion of the hydrogen is controlled by adopting the proportion of less than or equal to 3 percent, when the dew point or the oxygen content of the nitrogen-hydrogen protective gas does not meet the requirement, the proportion of the hydrogen is controlled by the proportion of less than or equal to 5 percent, the reason that the dew point or the oxygen content is not proper is searched, and the proportion of the hydrogen is controlled by restoring the proportion of.
By the scheme, the actual operation on site is tracked, the dew point of the atmosphere in the furnace is-48 ℃, the oxygen content is 8ppm, the standard requirement is met, the nitrogen-hydrogen mixed flow is saved by 2.4%, and the comparison effect of the example 1 is shown in the table 1.
Table 1 comparative effect table of example 1
Example 2:
the nitrogen-hydrogen protective gas control method for the continuous annealing furnace is characterized in that when a steel plate with the thickness of more than or equal to 1.5mm is produced, the furnace pressure of a heating section 1, a heating section 2 and a slow cooling section of the annealing furnace is controlled according to 240 +/-10 Pa, the furnace pressure of other sections is controlled according to 210 +/-10 Pa, the furnace pressure is set in a program, and the flow of the nitrogen-hydrogen protective gas is automatically adjusted according to the set furnace pressure.
Referring to fig. 1, the furnace pressure closed-loop control process is the same as in example 1.
The opening degree of the diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent. While adjusting the furnace pressure and the flow of the nitrogen-hydrogen protective gas, the opening degree of each section of the bleeding valve (including an automatic bleeding valve and a manual bleeding valve) is also adjusted and controlled according to the percentage less than or equal to 5 percent.
The hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion of less than or equal to 3 percent. When the nitrogen-hydrogen protective atmosphere in the furnace meets the standard that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the proportion of the hydrogen is controlled by adopting the proportion of less than or equal to 3 percent, when the dew point or the oxygen content of the nitrogen-hydrogen protective gas does not meet the requirement, the proportion of the hydrogen is controlled by the proportion of less than or equal to 5 percent, the reason that the dew point or the oxygen content is not proper is searched, and the proportion of the hydrogen is controlled by restoring the proportion of.
By the scheme, the on-site actual operation is realized, the furnace atmosphere meets the standard requirements that the dew point is-48 ℃ and the oxygen content is 15ppm, the nitrogen flow is saved by 10.8 percent, and the comparison effect of the example 2 is shown in the table 2.
Table 2 comparative table of effects of example 2
Example 3:
the nitrogen-hydrogen protective gas control method of the continuous annealing furnace, when producing the ordinary steel grade, heat 1 section, heat 2 section and slow cooling section furnace pressure and control according to 220 + -10 Pa, other every section is controlled according to 210 + -10 Pa; the flow of the nitrogen-hydrogen protective gas is automatically adjusted according to the furnace pressure. The furnace pressure is set in the program, and the flow of the nitrogen-hydrogen protective gas is automatically adjusted according to the set furnace pressure.
Referring to fig. 1, the furnace pressure closed-loop control process is the same as in example 1.
The opening degree of the diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent. The opening degree of the prior diffusing valve of each section is generally controlled according to 5-10%, and the opening degree of the diffusing valve (comprising an automatic diffusing valve and a manual diffusing valve) of each section is also adjusted when the furnace pressure and the flow of the nitrogen-hydrogen protective gas are adjusted, and is controlled according to the value of less than or equal to 5%.
The hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion of less than or equal to 3 percent. When the nitrogen-hydrogen protective atmosphere in the furnace meets the standard that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the proportion of the hydrogen is controlled by adopting the proportion of less than or equal to 3 percent, when the dew point or the oxygen content of the nitrogen-hydrogen protective gas does not meet the requirement, the proportion of the hydrogen is controlled by the proportion of less than or equal to 5 percent, the reason that the dew point or the oxygen content is not proper is searched, and the proportion of the hydrogen is controlled by restoring the proportion of.
According to the scheme, the on-site actual operation is realized, the furnace atmosphere meets the requirements of a dew point of-42 ℃, the oxygen content is 18ppm, the standard requirements are met, the flow of the nitrogen-hydrogen protective gas is saved by 27.8%, and the actual effect is shown in Table 3.
Table 3 comparative effect table of example 3
In actual production, DP high-strength steel, phosphorus-containing high-strength steel, O5 automobile sheet, thick materials and other steel types account for about 33%, and in consideration of the time difference of variety exchange and other problems, the nitrogen-hydrogen mixed furnace gas with more than 55% of time can be saved during production, and the effects of energy conservation and emission reduction are obvious. After the nitrogen-hydrogen protective gas is controlled by the method, the energy-saving effect is shown in table 4, namely the nitrogen-hydrogen protective gas and the gas flow calibration table of table 4
| Item | Before implementation (m)3/h) | After implementation (m)3/h) | Saving rate% |
| Average hourly flow of nitrogen | 2860 | 2320 | 18.8％ |
| Average hourly flow of hydrogen | 82 | 65 | 20.7％ |
| Average hourly flow of gas | 13450 | 12670 | 5.8％ |
After the technical scheme controls the nitrogen-hydrogen protective gas, the furnace pressure, the dew point and the oxygen content meet the requirements, and the product quality meets the customer requirements.
On the premise of ensuring the process requirement and the product quality, the invention effectively reduces the usage amount and the discharge amount of the nitrogen-hydrogen mixed protective gas, improves the utilization rate of the protective gas and reduces the consumption of nitrogen, hydrogen and coal gas. Wherein, the nitrogen is saved by about 18.8 percent compared with the original use amount, the hydrogen is saved by about 20.7 percent compared with the original use amount, and the coal gas is saved by about 5.8 percent.
Claims (2)
1. A nitrogen-hydrogen protective gas control method for a continuous annealing furnace comprises the following aspects:
1) different furnace pressures and nitrogen-hydrogen protective gas flows are set according to different varieties:
when producing DP high-strength steel, phosphorus-containing high-strength steel and O5 automobile plates, the furnace pressure of the heating 1 section, the heating 2 section and the slow cooling section of the annealing furnace is controlled according to 250 +/-10 Pa, and the furnace pressure of other sections is controlled according to 220 +/-10 Pa;
when producing common steel except the above steel types, the furnace pressure of the heating 1 section, the heating 2 section and the slow cooling section is controlled according to 220 +/-10 Pa, and other sections are controlled according to 210 +/-10 Pa;
when the thickness of the produced strip steel is more than or equal to 1.5mm, the furnace pressure of a heating section 1, a heating section 2 and a slow cooling section of the annealing furnace is controlled according to 240 +/-10 Pa, and other sections are controlled according to 210 +/-10 Pa; if the thickness of the strip steel is more than or equal to 1.5mm and the steel types are DP high-strength steel, phosphorus-containing high-strength steel and O5 automobile plates, the furnace pressure is determined according to the furnace pressure when the DP high-strength steel, the phosphorus-containing high-strength steel and the O5 automobile plates are produced;
2) the opening degree of a diffusion valve at each section of the annealing furnace is controlled to be less than or equal to 5 percent;
3) the hydrogen proportion of the nitrogen-hydrogen protective gas is controlled by the proportion less than or equal to 5 percent:
when the nitrogen-hydrogen protective atmosphere in the furnace meets the conditions that the dew point is less than or equal to minus 40 ℃ and the oxygen content is less than or equal to 20ppm, the hydrogen proportion is controlled by adopting the proportion less than or equal to 3 percent; otherwise, the hydrogen proportion is controlled according to the proportion of less than or equal to 5 percent.
2. The method for controlling the nitrogen-hydrogen protective gas of the continuous annealing furnace according to claim 1, wherein the furnace pressure is adjusted 5-10 minutes ahead of time when the production of ordinary steel is shifted to DP high-strength steel, phosphorus-containing high-strength steel or O5 auto plates in step 1).
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| CN113136483A (en) * | 2021-03-31 | 2021-07-20 | 首钢京唐钢铁联合有限责任公司 | Heating furnace pressure control method and device |
| CN114540598A (en) * | 2022-02-07 | 2022-05-27 | 中冶南方工程技术有限公司 | Cold rolling annealing furnace protective gas supply and recycling method |
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