CN114292998A - Method for reducing oxidation burning loss of steel billet in heating furnace - Google Patents
Method for reducing oxidation burning loss of steel billet in heating furnace Download PDFInfo
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- CN114292998A CN114292998A CN202111498984.7A CN202111498984A CN114292998A CN 114292998 A CN114292998 A CN 114292998A CN 202111498984 A CN202111498984 A CN 202111498984A CN 114292998 A CN114292998 A CN 114292998A
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Abstract
The invention relates to the technical field of heating furnace processes, in particular to a method for reducing oxidation burning loss of a billet in a heating furnace. The method specifically comprises the following steps: 1) controlling the atmosphere of furnace gas in each section: the heating furnace is divided into a preheating section, a heating section and a soaking section, the air excess coefficient of the soaking section is controlled to be 0.9-0.95, and the air excess coefficient of the heating section is controlled to be 1.05-1.2; 2) controlling the heating temperature of each section: the temperature of the preheating section is controlled to be 700-1000 ℃, the temperature of the heating section is controlled to be 1150-1330 ℃, and the temperature of the soaking section is controlled to be 1280-1300 ℃; 3) controlling the pressure of the hearth: ensuring that the hearth pressure is micro-positive pressure and the hearth pressure is relative pressure; controlling the pressure of the No. 1 hearth to be 3 +/-2 Pa; controlling the pressure of the No. 2 hearth to be 7 +/-2 Pa; controlling the pressure of the No. 3 hearth to be 9 +/-2 Pa; the 4# furnace pressure is controlled at 2.5 +/-2 Pa. The invention effectively reduces the oxidation burning loss of the billet in the heating furnace and can effectively reduce the burning loss by more than 0.1 percent.
Description
Technical Field
The invention relates to the technical field of heating furnace processes, in particular to a method for reducing oxidation burning loss of a billet in a heating furnace.
Background
The steel yield of China is the first global, the yield of the steel reaches 8 hundred million tons in 2018 years, most of steel production needs a billet heating process at high temperature, the deformation resistance of a billet is reduced at high temperature, the tonnage requirement of rolling, extruding or forging equipment can be reduced, intermediate heating with multiple fire times is generally needed, and the steel which needs to be heated and then subjected to plastic processing accounts for more than half of the total yield of the steel.
However, the steel is subjected to CO in the furnace gas during heating2、H2O、O2And SO2The surface of the steel is oxidized to form scale, and about 0.5% to 3% of the steel is oxidized to scale per heating. If 425 ten thousand tons of steel products of annual output of the production line, the annual burning loss amount is 3000-18000 tons, if the burning loss is reduced by 1%, the annual production of 4.25 ten thousand tons of steel products is increased equivalently, so that the reduction of the oxidation burning loss becomes the problem to be solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for reducing the oxidation burning loss of a billet in a heating furnace. Effectively reduces the oxidation burning loss of the billet in the heating furnace and can effectively reduce the burning loss by more than 0.1 percent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for reducing oxidation burning loss of a steel billet in a heating furnace specifically comprises the following steps:
1) controlling the atmosphere of furnace gas in each section:
the heating furnace is divided into a preheating section, a heating section and a soaking section,
the air excess coefficient of the soaking section is controlled to be 0.9-0.95, and the air excess coefficient of the heating section is controlled to be 1.05-1.2;
2) controlling the heating temperature of each section:
the temperature of the preheating section is controlled to be 700-1000 ℃, the temperature of the heating section is controlled to be 1150-1330 ℃, and the temperature of the soaking section is controlled to be 1280-1300 ℃;
3) controlling the pressure of the hearth:
ensuring that the hearth pressure is micro-positive pressure and the hearth pressure is relative pressure;
controlling the pressure of the No. 1 hearth to be 3 +/-2 Pa; controlling the pressure of the No. 2 hearth to be 7 +/-2 Pa; controlling the pressure of the No. 3 hearth to be 9 +/-2 Pa; the 4# furnace pressure is controlled at 2.5 +/-2 Pa.
The heating section in the step 1) comprises a heating section and two heating sections, the air excess coefficient of the first heating section is controlled to be 1.1-1.2, and the air excess coefficient of the second heating section is controlled to be 1.05-1.1.
The temperature of the heating section in the step 1) comprises a first heating section temperature and a second heating section temperature, wherein the first heating section temperature is controlled to be 1150-1180 ℃, and the second heating section temperature is controlled to be 1320-1330 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention fully utilizes the reducing atmosphere of the soaking section to inhibit the process of high-temperature section oxidation; the second heating section forms a high-temperature area by using the fuel which is incompletely combusted in the soaking section; the temperature of a heating section is reduced, so that the heat exchanger can be protected, the residence time of a high-temperature area is reduced, and the oxidation burning loss can be effectively reduced. The invention can effectively reduce the oxidation burning loss of the billet in the heating furnace and can effectively reduce the burning loss by more than 0.1 percent.
Detailed Description
The following further illustrates embodiments of the invention, but is not intended to limit the scope thereof:
a method for reducing oxidation burning loss of a steel billet in a heating furnace specifically comprises the following steps:
the factors influencing oxidation are mainly: heating temperature, heating time, furnace gas atmosphere and steel components.
1) Adjusting the atmosphere of furnace gas in each section:
the heating furnace is divided into a preheating section, a first heating section, a second heating section and a soaking section, and the oxidation speed of steel is very low under the low-temperature condition. When the temperature reaches 200-300 ℃, a thin layer of iron scale is generated on the surface of the steel. The rate of oxidation increases as the temperature increases, and oxidation proceeds sharply when the temperature reaches 1000 ℃ or higher, and if the burnout at 900 ℃ is 1, 2,1100 ℃ at 1000 ℃ is 3.5. And when the furnace atmosphere is a reducing atmosphere, the oxidation process of the steel can be reduced. In the production of the three furnaces, the surface temperature of the steel after entering the soaking section generally reaches over 1000 ℃, so the soaking section forms a reducing atmosphere by adjusting the excess air coefficient, and the reducing atmosphere can inhibit the further formation of iron scales even if the temperature of the soaking section is high. And the heating section adopts large air volume, so that the part of the fuel which is not completely combusted in the soaking section can be completely combusted in the heating section, and further the heating temperature of the second heating section is improved, so that the second heating section forms a high-temperature area.
When the plate blank is heated, the atmosphere of furnace gas in each section is adjusted, the air excess coefficient of each section of the heating furnace is strictly controlled, the air excess coefficient of a soaking section is controlled to be 0.9-0.95, the air excess coefficient of a first heating section is controlled to be 1.1-1.2, the air excess coefficient of a second heating section is controlled to be 1.05-1.1, and the section is formed into a reducing atmosphere by adjusting the air excess coefficient.
2) Improve soaking section heating temperature, reduce first heating section temperature, improve second heating section temperature: because two factors of heating temperature and time have great influence on the generation of oxidation quantity, in order to reduce the retention time of the steel billet in a high-temperature zone and reduce the temperature of a first heating section, the surface temperature of the steel billet is about 700 ℃ when the steel billet enters a second heating section, the steel billet is rapidly heated when entering the second heating section, and the surface temperature of the steel billet is continuously increased and uniformly heated at the later stage of heating until the requirement of tapping temperature is met.
During the production of the four furnaces, the time of the four furnaces is increased more than that of the three furnaces, so that excessive iron scales are avoided, the temperature of a hearth of a first heating section is reduced to 1130-1150 ℃ after the 4# heating furnace is put into production, and a plate blank is heated in a second heating section and a soaking section.
The temperature of the preheating section is controlled to be 700-1000 ℃, the temperature of the first heating section is controlled to be 1150-1180 ℃, the temperature of the second heating section is controlled to be 1320-1330 ℃, and the temperature of the soaking section is controlled to be 1280-1300 ℃.
3) Controlling the pressure of the hearth:
in order to ensure the reducing atmosphere of the soaking section, the pressure of the hearth is strictly controlled when the plate blank is heated, the slight fire of the laser detection hole at the furnace outlet side is preferably used, and the pressure of the No. 1 hearth is controlled to be 3 +/-1 Pa; controlling the pressure of the No. 2 hearth to be 7 +/-1 Pa; and the 3# furnace pressure is controlled to be 9 +/-1 Pa.
Example 1:
a method for reducing oxidation burning loss of a steel billet in a heating furnace specifically comprises the following steps:
1) adjusting the atmosphere of furnace gas in each section:
the heating furnace is divided into a preheating section, a first heating section, a second heating section and a soaking section,
the air excess coefficient of the soaking section is controlled to be 0.93, the air excess coefficient of the first heating section is controlled to be 1.2, the air excess coefficient of the second heating section is controlled to be 1.08, and the soaking section is enabled to form a reducing atmosphere by adjusting the air excess coefficient;
2) improve soaking section heating temperature, reduce first heating section temperature, improve second heating section temperature:
the temperature of the preheating section is controlled to be 700-1000 ℃, the temperature of the first heating section is controlled to be 1150-1180 ℃, the temperature of the second heating section is controlled to be 1320-1330 ℃, and the temperature of the soaking section is controlled to be 1280-1300 ℃;
3) controlling the pressure of the hearth:
controlling the pressure of the No. 1 hearth to be 3 Pa; controlling the pressure of the No. 2 hearth to be 7 Pa; the 3# furnace pressure is controlled at 9 Pa.
Example 2:
no. 4 stove is different from other three heating furnaces, and its preheating section is the heating section of taking the nozzle of can supplying heat, consequently, under four stove production conditions, the oxidation scaling loss is more serious, can reduce a heating and other section temperatures again, specifically includes:
1) adjusting the atmosphere of furnace gas in each section:
the other three furnaces are not changed, the preheating section of the furnace No. 4 is cut off and does not supply heat, and the excess air coefficient of other sections is the same as that of the other three heating furnaces.
2) Properly reducing the temperature of furnace gas in each section:
the preheating is controlled to be 700-900 ℃, the temperature of the first heating section is controlled to be 1130-1150 ℃, the temperature of the second heating section is controlled to be 1300-1320 ℃, and the temperature of the soaking section is controlled to be 1260-1290 ℃.
3) Controlling the pressure of the hearth:
controlling the hearth pressure of the 1# heating furnace to be 3 Pa; controlling the hearth pressure of the No. 2 heating furnace to be 7 Pa; controlling the hearth pressure of the 3# heating furnace to be 9 Pa; the hearth pressure of the 4# heating furnace is controlled to be 1.5 Pa.
Example 3:
the third furnace production condition of the No. 4 heating furnace participating in production is that the second heating section of the fourth furnace is shorter, so that the atmosphere, furnace gas set temperature and hearth pressure of the other two heating furnaces are the same as those of the embodiment 1, the preheating section of the No. 4 furnace supplies heat, the temperature is controlled to be 9800-1030 ℃, the furnace gas temperature of the first heating section is controlled to be 1160-1190 ℃, the furnace gas temperature of the second heating section is controlled to be 1320-1330 ℃, the furnace gas temperature of the soaking section is controlled to be 1280-1300 ℃, and the air surplus coefficient is the same as that of the other two heating furnaces.
The invention fully utilizes the reducing atmosphere of the soaking section to inhibit the process of high-temperature section oxidation; the second heating section forms a high-temperature area by using the fuel which is incompletely combusted in the soaking section; the temperature of a heating section is reduced, so that the heat exchanger can be protected, the residence time of a high-temperature area is reduced, and the oxidation burning loss can be effectively reduced.
The invention can effectively reduce the oxidation burning loss of the billet in the heating furnace and can effectively reduce the burning loss by more than 0.1 percent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A method for reducing oxidation burning loss of a steel billet in a heating furnace is characterized by comprising the following steps:
1) controlling the atmosphere of furnace gas in each section:
the heating furnace is divided into a preheating section, a heating section and a soaking section,
the air excess coefficient of the soaking section is controlled to be 0.9-0.95, and the air excess coefficient of the heating section is controlled to be 1.05-1.2;
2) controlling the heating temperature of each section:
the temperature of the preheating section is controlled to be 700-1000 ℃, the temperature of the heating section is controlled to be 1150-1330 ℃, and the temperature of the soaking section is controlled to be 1280-1300 ℃;
3) controlling the pressure of the hearth:
ensuring that the hearth pressure is micro-positive pressure and the hearth pressure is relative pressure;
controlling the pressure of the No. 1 hearth to be 3 +/-2 Pa; controlling the pressure of the No. 2 hearth to be 7 +/-2 Pa; controlling the pressure of the No. 3 hearth to be 9 +/-2 Pa; the 4# furnace pressure is controlled at 2.5 +/-2 Pa.
2. The method of claim 1, wherein the heating zone of step 1) comprises a heating zone and two heating zones, the air excess coefficient of the heating zone is controlled to be 1.1-1.2, and the air excess coefficient of the heating zone is controlled to be 1.05-1.1.
3. The method of claim 1, wherein the temperatures of the heating zones in step 1) include a heating zone temperature and a heating zone temperature, the heating zone temperature is controlled to 1150-1180 ℃ and the heating zone temperature is controlled to 1320-1330 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111498984.7A CN114292998A (en) | 2021-12-09 | 2021-12-09 | Method for reducing oxidation burning loss of steel billet in heating furnace |
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| CN202111498984.7A CN114292998A (en) | 2021-12-09 | 2021-12-09 | Method for reducing oxidation burning loss of steel billet in heating furnace |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881429A (en) * | 2017-11-16 | 2018-04-06 | 北京首钢股份有限公司 | A kind of hot rolling high-strength weathering steel and its manufacture method |
| CN110624954A (en) * | 2019-10-16 | 2019-12-31 | 北京首钢股份有限公司 | Plate shape control method for hot-rolled thin high-strength weathering steel |
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- 2021-12-09 CN CN202111498984.7A patent/CN114292998A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107881429A (en) * | 2017-11-16 | 2018-04-06 | 北京首钢股份有限公司 | A kind of hot rolling high-strength weathering steel and its manufacture method |
| CN110624954A (en) * | 2019-10-16 | 2019-12-31 | 北京首钢股份有限公司 | Plate shape control method for hot-rolled thin high-strength weathering steel |
Non-Patent Citations (1)
| Title |
|---|
| 韩仁志 等: "加热炉钢坯氧化烧损影响因素的分析研究", 鞍钢技术, no. 2, pages 37 - 38 * |
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