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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- 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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Abstract
The invention relates to blast furnace ironmaking, and discloses a method for judging the temperature change trend in a furnace in blast furnace ironmaking, which judges the temperature change trend in the furnace by detecting a temperature-time curve of molten iron after slag removal, 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 to balance the temperature in the furnace and avoid accidents in a smelting process caused by abnormal temperature in the furnace.
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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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990053078A (en) * | 1997-12-23 | 1999-07-15 | 이구택 | Blast furnace temperature compensation method |
| WO2010064727A1 (en) * | 2008-12-03 | 2010-06-10 | 新日本製鐵株式会社 | Method of determining temperature of molten pig iron and method of operating blast furnace using same |
| JP2014118599A (en) * | 2012-12-17 | 2014-06-30 | Jfe Steel Corp | Method for controlling furnace heat in blast furnace |
| CN106636514A (en) * | 2016-10-26 | 2017-05-10 | 马鞍山钢铁股份有限公司 | Online measurement device and method for temperature of large blast furnace molten iron |
| JP2018145520A (en) * | 2017-03-01 | 2018-09-20 | Ｊｆｅスチール株式会社 | Device and method of thermal prediction for blast furnace |
| CN108998608A (en) * | 2018-07-24 | 2018-12-14 | 中南大学 | A kind of blast furnace iron notch molten iron temperature measurement method and system based on infrared machine vision |
-
2021
- 2021-05-12 CN CN202110518105.6A patent/CN113201611A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990053078A (en) * | 1997-12-23 | 1999-07-15 | 이구택 | Blast furnace temperature compensation method |
| WO2010064727A1 (en) * | 2008-12-03 | 2010-06-10 | 新日本製鐵株式会社 | Method of determining temperature of molten pig iron and method of operating blast furnace using same |
| JP2014118599A (en) * | 2012-12-17 | 2014-06-30 | Jfe Steel Corp | Method for controlling furnace heat in blast furnace |
| CN106636514A (en) * | 2016-10-26 | 2017-05-10 | 马鞍山钢铁股份有限公司 | Online measurement device and method for temperature of large blast furnace molten iron |
| JP2018145520A (en) * | 2017-03-01 | 2018-09-20 | Ｊｆｅスチール株式会社 | Device and method of thermal prediction for blast furnace |
| CN108998608A (en) * | 2018-07-24 | 2018-12-14 | 中南大学 | A kind of blast furnace iron notch molten iron temperature measurement method and system based on infrared machine vision |
Non-Patent Citations (1)
| Title |
|---|
| 崔桂梅: "高炉铁水温度的多元时间序列建模和预测", 《钢铁研究学报》 * |
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