CN113201611A - Method for judging temperature change trend in blast furnace ironmaking - Google Patents
Method for judging temperature change trend in blast furnace ironmaking Download PDFInfo
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- CN113201611A CN113201611A CN202110518105.6A CN202110518105A CN113201611A CN 113201611 A CN113201611 A CN 113201611A CN 202110518105 A CN202110518105 A CN 202110518105A CN 113201611 A CN113201611 A CN 113201611A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 124
- 229910052742 iron Inorganic materials 0.000 claims abstract description 62
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 abstract description 9
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
本发明涉及高炉炼铁，本发明高炉炼铁中炉内温度变化趋势的判断方法通过检测除渣后铁水的温度‑时间曲线来判断炉内温度变化趋势，解决了无法获取炉内温度变化趋势的技术问题，进一步的，根据炉内温度变化趋势调整高炉，使炉内温度平衡，避免了炉内温度不正常导致冶炼过程出现事故本发明适用于高炉炼铁。
The invention relates to blast furnace ironmaking. The method for judging the temperature change trend in the furnace in blast furnace ironmaking according to the invention judges the temperature change trend in the furnace by detecting the temperature-time curve of molten iron after slag removal, and solves the problem that the temperature change trend in the furnace cannot be obtained. Technical problem, further, adjust the blast furnace according to the change trend of the temperature in the furnace, so that the temperature in the furnace is balanced, and the accident in the smelting process caused by the abnormal temperature in the furnace is avoided. The present invention is suitable for blast furnace ironmaking.
Description
Technical Field
The invention relates to blast furnace ironmaking, in particular to a method for judging the temperature change trend in a furnace in blast furnace ironmaking.
Background
The blast furnace iron-smelting process has four systems, namely a charging system, an air supply system, a slagging system and a thermal system, wherein the thermal system is the temperature level in the furnace, a reasonable and stable thermal system is the basis for smooth smelting, for the blast furnace for smelting vanadium-titanium magnetite, the thermal system is the main means for titanium slag thickening elimination and iron loss reduction, and in the smelting process, if the temperature in the furnace exceeds the normal working range, the problems of hanging materials, sliding materials, furnace tank freezing and the like can be caused, and serious accidents are caused.
The existing method for adjusting the temperature in the furnace is to detect the current temperature in the furnace, compare the current temperature with the normal working temperature range in the furnace, if the current temperature is too low or too high, adjust the temperature in the furnace by adopting upper portion adjustment, lower portion adjustment, ore load increase and decrease and pulverized coal amount, wherein the upper portion adjustment comprises changing coke load and distributing mode, the lower portion adjustment comprises increasing and decreasing coal injection amount and wind temperature, and the method for adjusting the temperature in the furnace by the current temperature in the furnace has uncertainty, such as: the current temperature in the furnace is low, but the current temperature tends to rise, if the temperature is increased by increasing the amount of the pulverized coal, the temperature in the furnace may be higher than the normal temperature after a period of time, so it is very important to know the temperature variation trend in the furnace when the temperature in the furnace is adjusted, however, the temperature variation trend in the furnace cannot be obtained in the prior art.
Disclosure of Invention
The technical problems solved by the invention are as follows: the method for judging the temperature change trend in the blast furnace during the iron making of the blast furnace solves the technical problem that the temperature change trend in the blast furnace cannot be obtained, and further, the blast furnace is adjusted according to the temperature change trend in the blast furnace, so that the temperature in the blast furnace is balanced, and accidents in the smelting process caused by abnormal temperature in the blast furnace are avoided.
The invention adopts the technical scheme for solving the technical problems that: the method for judging the temperature change trend in the blast furnace iron making comprises the following steps:
s01, obtaining a temperature-time curve of the molten iron after deslagging in the primary tapping process of the blast furnace;
and S02, obtaining the temperature change trend in the furnace according to the temperature-time curve of the molten iron.
Further, in step S02, taking the preset temperature as a starting point, closing the tapping hole as a cut-off point, dividing an intermediate section in the temperature-time curve of the molten iron, and obtaining a furnace temperature variation trend according to a variation trend of the intermediate section temperature-time curve, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, in step S02, the preset time is taken as a starting point, the tapping hole is closed as a cut-off point, an intermediate section is divided from the temperature-time curve of the molten iron, and the variation trend of the temperature in the furnace is obtained according to the variation trend of the temperature-time curve of the intermediate section, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, in step S02, a temperature-time curve of an iron runner is obtained, where the iron runner is a ditch where molten iron in the blast furnace flows to the slag removal completion location, a start time point and an end time point at which the temperature of the iron runner is stable are obtained according to the temperature-time curve of the iron runner, the molten iron temperature curve is divided into middle sections according to the start time point and the end time point, and a furnace temperature variation trend is obtained according to a variation trend of the middle section temperature-time curve, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, fitting a temperature-time curve of the middle section into a temperature-time linear equation, calculating the time required by the temperature in the furnace to exceed the normal working range according to the linear equation, sending out early warning information when the required time is less than a preset value, and adjusting the temperature in the furnace by a worker according to the early warning information.
Furthermore, the method also comprises the step of adjusting the blast furnace according to the temperature change trend in the blast furnace so that the temperature change trend tends to be stable.
Further, in step S01, the position where the deslagging is completed is a sand pit.
The invention has the beneficial effects that: the method for judging the temperature change trend in the blast furnace during the iron making of the blast furnace judges the temperature change trend in the furnace by detecting the temperature-time curve of the molten iron after deslagging, solves the technical problem that the temperature change trend in the furnace cannot be obtained, and further adjusts the blast furnace according to the temperature change trend in the furnace, so that the temperature in the furnace is balanced, and the accident in the smelting process caused by abnormal temperature in the furnace is avoided.
Drawings
FIG. 1 is a flowchart of a method for determining a trend of a temperature change in a blast furnace iron making process according to the present invention.
Detailed Description
The method for judging the temperature change trend in the blast furnace ironmaking of the invention, as shown in the attached figure 1, comprises the following steps:
s01, obtaining a temperature-time curve of the molten iron after deslagging in the primary tapping process of the blast furnace;
and S02, obtaining the temperature change trend in the furnace according to the temperature-time curve of the molten iron.
Further, in step S02, taking the preset temperature as a starting point, closing the tapping hole as a cut-off point, dividing an intermediate section in the temperature-time curve of the molten iron, and obtaining a furnace temperature variation trend according to a variation trend of the intermediate section temperature-time curve, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, in step S02, the preset time is taken as a starting point, the tapping hole is closed as a cut-off point, an intermediate section is divided from the temperature-time curve of the molten iron, and the variation trend of the temperature in the furnace is obtained according to the variation trend of the temperature-time curve of the intermediate section, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, in step S02, a temperature-time curve of an iron runner is obtained, where the iron runner is a ditch where molten iron in the blast furnace flows to the slag removal completion location, a start time point and an end time point at which the temperature of the iron runner is stable are obtained according to the temperature-time curve of the iron runner, the molten iron temperature curve is divided into middle sections according to the start time point and the end time point, and a furnace temperature variation trend is obtained according to a variation trend of the middle section temperature-time curve, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
Further, fitting a temperature-time curve of the middle section into a temperature-time linear equation, calculating the time required by the temperature in the furnace to exceed the normal working range according to the linear equation, sending out early warning information when the required time is less than a preset value, and adjusting the temperature in the furnace by a worker according to the early warning information.
Furthermore, the method also comprises the step of adjusting the blast furnace according to the temperature change trend in the blast furnace so that the temperature change trend tends to be stable.
Further, in step S01, the position where the deslagging is completed is a sand pit.
Example (b):
taking the blast furnace smelting of vanadium-titanium magnetite as an example, in the process of smelting vanadium-titanium magnetite by the blast furnace, molten iron needs to be discharged through a taphole for many times, the molten iron flowing out from the taphole contains slag and a large amount of smoke dust, slag is removed in the process that the molten iron flows to a sand pit, and the molten iron after slag removal is obtained at the sand pit and flows into a molten iron tank through a branch ditch.
The method for judging the temperature change trend in the blast furnace iron making comprises the following steps:
s01, obtaining a temperature-time curve of the molten iron after deslagging in the primary tapping process of the blast furnace;
and S02, obtaining the temperature change trend in the furnace according to the temperature-time curve of the molten iron.
In this embodiment, the software and hardware used include a detection system and an infrared thermometer, and the detection system is connected to the infrared thermometer; the infrared thermometer is used for detecting the temperature of molten iron at the sand pit to obtain a temperature-time curve of the molten iron at the sand pit, the detection system marks off a middle section in the temperature-time curve of the molten iron, fits the temperature-time curve of the middle section into a temperature-time linear equation, calculates the time required by the temperature in the furnace exceeding a normal working range according to the linear equation, and sends out early warning information when the required time is less than a preset value.
Specifically, the detection system marks out the middle section in the temperature-time curve of the molten iron and selects one of the following three modes:
firstly, taking a preset temperature as an initial point, and closing a taphole as a cut-off point;
specifically, the temperature of the molten iron gradually increases with time from the start time of the temperature-time curve of the molten iron in this tapping process, and is counted as the start time point of the intermediate section when the temperature of the molten iron reaches the preset temperature, and as the end time point of the intermediate section when the tapping hole is closed, that is, when the tapping process is terminated.
Secondly, taking preset time as a starting point, and closing a taphole as a cut-off point;
specifically, starting from the starting time of the molten iron temperature-time curve in the tapping process, taking the preset time as the starting time point of the middle section, and closing the tapping hole as the ending time point of the middle section;
and thirdly, detecting a temperature-time curve of the iron runner by utilizing a plurality of temperature sensors, wherein the temperature sensors are respectively arranged at proper positions in the iron runner and are used for detecting the temperature of the iron runner in real time, the detection system acquires an average temperature-time curve of the iron runner according to detection data of the plurality of temperature sensors, and the average temperature-time curve is used as a starting time point of an intermediate section of the molten iron temperature-time curve when the temperature increment of the iron runner in unit time is lower than a first set value, and the closing of the iron outlet is used as an ending time point of the intermediate section.
Further, in this embodiment, the worker may also adjust the blast furnace according to the trend of the temperature change in the furnace when the detection system does not give an alarm, so that the trend of the temperature change tends to be stable.
Claims (7)
1. The method for judging the temperature change trend in the blast furnace ironmaking is characterized by comprising the following steps of:
s01, obtaining a temperature-time curve of the molten iron after deslagging in the primary tapping process of the blast furnace;
and S02, obtaining the temperature change trend in the furnace according to the temperature-time curve of the molten iron.
2. The method as claimed in claim 1, wherein in step S02, the temperature variation trend in the furnace is obtained from the variation trend of the temperature-time curve of the middle section, by using the preset temperature as a starting point, closing the tap hole as a cut-off point, and dividing the middle section in the temperature-time curve of the molten iron, wherein:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
3. The method as claimed in claim 1, wherein in step S02, the temperature variation trend in the furnace is obtained from the variation trend of the temperature-time curve of the middle section, by using a preset time as a starting point, closing the tap hole as a cut-off point, and dividing the middle section in the temperature-time curve of the molten iron, wherein:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
4. The method for determining a trend of a temperature change in a furnace in blast furnace ironmaking according to claim 1, wherein in step S02, a temperature-time curve of an iron runner is further obtained, the iron runner is a channel where molten iron in the blast furnace flows to a place where slag removal is completed, a start time point and an end time point at which the temperature of the iron runner is stable are obtained according to the temperature-time curve of the iron runner, the molten iron temperature curve is divided into middle sections according to the start time point and the end time point, and the trend of the temperature change in the furnace is obtained according to a trend of the temperature-time curve of the middle sections, that is:
when the middle section temperature-time curve is gradually increased, the temperature in the furnace tends to be increased;
when the middle section temperature-time curve is stable, the temperature in the furnace tends to be stable;
when the middle section temperature-time curve is gradually reduced, the temperature in the furnace tends to be reduced.
5. The method according to any one of claims 1 to 4, further comprising fitting a temperature-time curve in the middle section to a temperature-time linear equation, calculating a time required for the temperature in the furnace to exceed a normal operating range according to the linear equation, and when the time required is less than a preset value, issuing warning information and adjusting the temperature in the furnace by the worker according to the warning information.
6. The method for judging the trend of temperature change in a blast furnace during iron making according to any one of claims 1 to 4, further comprising adjusting the blast furnace according to the trend of temperature change in the blast furnace to make the trend of temperature change smooth.
7. The method for judging the trend of temperature change in a blast furnace during iron making according to any one of claims 1 to 4, wherein the place where the slag removal is completed in step S01 is a sand pit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI853478B (en) * | 2022-03-07 | 2024-08-21 | 日商Ｊｆｅ鋼鐵股份有限公司 | Method for predicting molten iron temperature of blast furnace, method for learning molten iron temperature prediction model of blast furnace, method for operating blast furnace, device for predicting molten iron temperature of blast furnace, system for predicting molten iron temperature and terminal device |
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2021
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| TWI853478B (en) * | 2022-03-07 | 2024-08-21 | 日商Ｊｆｅ鋼鐵股份有限公司 | Method for predicting molten iron temperature of blast furnace, method for learning molten iron temperature prediction model of blast furnace, method for operating blast furnace, device for predicting molten iron temperature of blast furnace, system for predicting molten iron temperature and terminal device |
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Application publication date: 20210803 |