CN111809013A - Online installation method for blast furnace hearth thermocouple - Google Patents
Online installation method for blast furnace hearth thermocouple Download PDFInfo
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- CN111809013A CN111809013A CN202010663586.5A CN202010663586A CN111809013A CN 111809013 A CN111809013 A CN 111809013A CN 202010663586 A CN202010663586 A CN 202010663586A CN 111809013 A CN111809013 A CN 111809013A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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Abstract
The invention discloses an online installation method of a blast furnace hearth thermocouple, belonging to the technical field of metallurgy. The online installation method of the blast furnace hearth thermocouple comprises the following steps: cutting off the metal sleeve of the damaged thermocouple; forming a hole in the furnace shell, wherein the position of the hole corresponds to the position of the damaged thermocouple; cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting to obtain a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple; drawing out the damaged thermocouple; a new thermocouple is inserted into the installation location of the new thermocouple. The online installation method of the blast furnace hearth thermocouple can realize online installation of the thermocouple temperature monitoring point without stopping the furnace, has high installation efficiency, saves time and labor, can reduce the temperature loss of the side wall of the blast furnace hearth, and can judge the change of the working state of the hearth by visual and complete data for iron-smelting workers.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an online mounting method for a thermocouple of a blast furnace hearth.
Background
The safe and long service life of the blast furnace hearth is a research topic which is very important for ironmaking workers. The design life of a modern large-scale blast furnace first-generation furnace is usually about 20 years, but in the production practice of most blast furnaces, the temperature of the side wall of a hearth rises, even the hearth burns through accidents happen, and the safety and the long life of the blast furnace are seriously restricted.
The modern blast furnace hearth and bottom erosion monitoring is based on hearth and bottom temperature measurement couple data, so the integrity and accuracy of the thermoelectric even data are of great importance. At the beginning of blast furnace design at home and abroad, a certain number of temperature measuring couples are pre-buried at the hearth and the bottom of the hearth, especially in a hearth elephant foot area which is easy to corrode.
However, in the production practice, it is found that with the time and the influence of the external environment, the phenomenon of damage of some thermocouples inevitably occurs after the thermocouples are used for a period of time, and particularly, the thermocouples in the hearth region at the end of the campaign are damaged in a large area, so that the temperature data of the side wall of the hearth is lost, and huge hidden dangers are brought to the erosion monitoring and production safety of the blast furnace hearth.
Disclosure of Invention
The invention provides an online installation method of a blast furnace hearth thermocouple, which solves or partially solves the technical problems that in the prior art, a part of thermocouples are damaged after being used for a period of time, so that temperature data of the side wall of a hearth is lost, and huge hidden dangers are brought to erosion monitoring and production safety of the blast furnace hearth.
In order to solve the technical problem, the invention provides an online mounting method of a blast furnace hearth thermocouple, which comprises the following steps: cutting off the metal sleeve of the damaged thermocouple; forming a hole in the furnace shell, wherein the position of the hole corresponds to the position of the damaged thermocouple; cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting to obtain a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple; drawing out the damaged thermocouple; a new thermocouple is inserted into the installation location of the new thermocouple.
Further, a sleeve is obtained by opening a hole on the furnace shell; when the damaged thermocouple is extracted, the sleeve is inserted into the hole and welded with the furnace shell.
Further, when the temperature value is less than the threshold value, the grouting material layer in the furnace shell needs to be cut continuously; when the temperature value is equal to the threshold value, the cutting position is the new thermocouple installation position.
Further, when the damaged thermocouple is drawn out, the grouting powder in the hole is cleaned.
Further, the inserting a new thermocouple into the installation position of the new thermocouple comprises the following steps: fixedly arranging a metal sleeve of a new thermocouple on a furnace shell; a first flange plate is fixedly arranged at the end part of the metal sleeve of the new thermocouple, which is far away from the furnace shell; fixedly mounting a protection tube on the second flange plate, inserting a new thermocouple into the protection tube, and inserting the new thermocouple into the hole by the protection tube penetrating through a metal sleeve of the new thermocouple; when the new thermocouple reaches the mounting position, the second flange is fastened to the first flange.
Further, the metal sleeve and the protective tube of the new thermocouple are coaxial with the bore.
Further, when the second flange plate is fastened with the first flange plate, the polyester grouting material is injected into gaps among the metal sleeve of the new thermocouple, the protection tube and the carbon brick through the grouting hole of the metal sleeve of the new thermocouple.
Based on the same inventive concept, the application also provides an online installation method of the blast furnace hearth thermocouple, which comprises the following steps: determining the nearest position to the damaged thermocouple according to the design of the blast furnace, and opening a hole at the position; cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting to obtain a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple; a new thermocouple is inserted into the installation location of the new thermocouple.
Further, the position of the opening corresponds to the gap between two adjacent staves.
Further, a sleeve is obtained by opening a hole on the furnace shell; when the position of the opening is determined, inserting the sleeve into the opening and welding the sleeve with the furnace shell; the center of the sleeve is provided with a through hole, and the diameter of the through hole is matched with that of the protection tube of the new thermocouple.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
as the metal sleeve of the damaged thermocouple is cut off; the method comprises the steps of forming a hole in a furnace shell, wherein the hole corresponds to a damaged thermocouple, cutting a grouting material layer in the furnace shell at the hole, measuring temperature through a new thermocouple when cutting is performed, obtaining a temperature value, comparing the temperature value with a threshold value, determining the installation position of the new thermocouple, and extracting the damaged thermocouple; the novel thermocouple is inserted into the mounting position of the novel thermocouple, so that the thermocouple temperature monitoring point can be mounted on line without stopping the furnace, the mounting is efficient, time and labor are saved, the temperature loss of the side wall of the blast furnace hearth can be reduced, the erosion monitoring of the blast furnace hearth can be ensured to be normally carried out, the working state change of the hearth can be judged by visual complete data for iron-smelting workers, and the production safety is ensured.
Because the nearest position of the damaged thermocouple is determined according to the design of the blast furnace, the hole is formed in the position, the grout layer in the furnace shell is cut at the hole forming position, when the cutting is carried out, the temperature is measured through the new thermocouple, the temperature value is obtained, the temperature value is compared with the threshold value, the mounting position of the new thermocouple is determined, and the new thermocouple is inserted into the mounting position of the new thermocouple, therefore, the thermocouple temperature monitoring point can be mounted on line without stopping the furnace, the mounting is efficient, the time and the labor are saved, the temperature loss of the side wall of the blast furnace hearth can be reduced, the corrosion monitoring of the blast furnace hearth can be normally carried out, the working state change of the hearth is judged according to visual complete data for iron-smelting workers, and the production safety is ensured.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a method for online installation of a blast furnace hearth thermocouple according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the method for online installation of a blast furnace hearth thermocouple provided in the embodiments of the present invention;
fig. 3 is a schematic structural diagram of a blast furnace hearth according to an embodiment of the present invention.
Detailed Description
Example one
Referring to fig. 1 and 3, an online installation method of a blast furnace hearth thermocouple provided by the embodiment of the invention includes the following steps:
at step M1, the metal sleeve of the damaged thermocouple is cut off.
And step M2, holes are formed in the furnace shell, and the positions of the holes correspond to the positions of the damaged thermocouples.
And step M3, cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting, obtaining a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple.
And step M4, extracting the damaged thermocouple.
And step M5, inserting a new thermocouple into the installation position of the new thermocouple.
The embodiment of the application cuts off the metal sleeve of the damaged thermocouple; the method comprises the steps of forming a hole in a furnace shell, wherein the hole corresponds to a damaged thermocouple, cutting a grouting material layer in the furnace shell at the hole, measuring temperature through a new thermocouple when cutting is performed, obtaining a temperature value, comparing the temperature value with a threshold value, determining the installation position of the new thermocouple, and extracting the damaged thermocouple; the novel thermocouple is inserted into the mounting position of the novel thermocouple, so that the thermocouple temperature monitoring point can be mounted on line without stopping the furnace, the mounting is efficient, time and labor are saved, the temperature loss of the side wall of the blast furnace hearth can be reduced, the erosion monitoring of the blast furnace hearth can be ensured to be normally carried out, the working state change of the hearth can be judged by visual complete data for iron-smelting workers, and the production safety is ensured.
Step M1 is described in detail.
And cutting off the damaged metal sleeve of the thermocouple by an angle grinder, and polishing and flattening the furnace shell after cutting.
Step M2 is described in detail.
Carry out the trompil on the furnace skin through magnetic drill, before the trompil, at two supporting seats of top welding of trompil position, utilize safety rope hoist and mount magnetic drill, prevent that magnetic drill from dropping.
When the magnetic drill is used for drilling holes on the furnace shell, the magnetic drill is electrified and vertically adsorbed at the position of the furnace shell hole, the magnetic drill is fixed, the position of a base of the magnetic drill is marked, a hollow drill bit with the cutting depth of 100mm and the diameter of 25mm is installed, the furnace shell at the damaged thermocouple position is cut off, and water cooling is carried out in the cutting process.
Step M3 is described in detail.
Specifically, when the temperature value is less than the threshold value, the slurry layer in the furnace shell needs to be cut continuously; when the temperature value is equal to the threshold value, the cutting position is the new thermocouple installation position.
The slurry layer in the furnace shell is cut at the position of the opening by the magnetic drill, and when the cutting is carried out, the hollow drill is replaced by the twist drill with the cutting depth of 300-500mm and the diameter of 3-5 mm.
The grouting material near the couple in the furnace shell is slowly cut off through the magnetic drill, and in the cutting process, the magnetic drill is noticed to keep the power-on state, and the position and the cutting precision of the magnetic drill are influenced by strictly prohibiting the power off. After cutting to a certain depth, a new thermocouple is deeply inserted into the position of the opening to measure the temperature in the furnace skin. And positioning the new thermocouple insertion depth according to the damaged thermocouple insertion depth, but stopping cutting when the temperature of the foremost end of the opening reaches 50 ℃ to prevent the cutting depth from excessively damaging the complete structure of the carbon brick on the side wall of the hearth, namely the new thermocouple insertion position.
Specifically, a sleeve is obtained by punching a hole on a furnace shell; when the damaged thermocouple is pulled out, the sleeve is inserted into the hole and is welded with the furnace shell, so that the material is saved, and meanwhile, the stability of the furnace shell is ensured.
Specifically, when the damaged thermocouple is pulled out, grouting material powder in the hole is cleaned, and cleanness of the hole is guaranteed. In this embodiment, the aperture is emptied of grout powder using a high suction cleaner with a long conduit.
Step M5 is described in detail.
Specifically, inserting a new thermocouple into the installation location of the new thermocouple comprises the steps of:
and fixedly arranging the metal sleeve of the new thermocouple on the furnace shell.
And a first flange is fixedly arranged at the end part of the metal sleeve of the new thermocouple, which is far away from the furnace shell.
And fixedly mounting a protection tube on the second flange plate, inserting a new thermocouple into the protection tube, and inserting the new thermocouple into the hole by penetrating the protection tube through the metal sleeve of the new thermocouple.
And when the new thermocouple reaches the installation position, fastening the second flange plate with the first flange plate, positioning the new thermocouple through fastening the second flange plate with the first flange plate, and sealing.
Wherein, a new thermocouple sheathed with a protection tube is inserted into the opening position, and is required to be slowly inserted. The front end of the protection tube is of a flat structure, the thermocouple is strictly prevented from bending in the insertion process, and a single thermocouple or a plurality of new thermocouples are inserted according to the arrangement of damaged thermocouples.
The length of the metal sleeve of the new thermocouple is 300 and 500 mm.
The metal sleeve and the protection tube of the novel thermocouple are coaxial with the hole, so that the installation precision is ensured.
When the second flange plate is fastened with the first flange plate, the polyester grouting material is injected into gaps among the metal sleeve of the new thermocouple, the protection tube and the carbon brick through the grouting hole of the metal sleeve of the new thermocouple, and the sealing performance is guaranteed.
Wherein, the grouting pressure is controlled at 2.0MPa, the grouting process is slowly pressurized, and the grouting is stopped when the specified pressure is reached; and maintaining the pressure for 30min, grouting again after the pressure is reduced, and stopping grouting for multiple times until the pressure is kept unchanged for 30 min.
Example two
Referring to fig. 2 and 3, an online installation method of a blast furnace hearth thermocouple comprises the following steps:
and step N1, determining the nearest position to the damaged thermocouple according to the design of the blast furnace, and drilling holes at the position.
And step N2, cutting the grouting material layer in the furnace shell at the position of the opening, measuring the temperature through a new thermocouple when cutting, obtaining a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple.
And step N3, inserting a new thermocouple into the installation position of the new thermocouple.
This application embodiment is owing to confirm the nearest position apart from the thermocouple that has damaged according to the blast furnace design, and carry out the trompil in this position, the grout bed cuts in the furnace skin at the trompil position, when cutting, carry out the temperature measurement through new thermocouple, obtain temperature value, compare temperature value and threshold value, confirm the mounted position of new thermocouple, insert the mounted position of new thermocouple with new thermocouple, so, can realize not stopping the online installation thermocouple temperature monitoring point of stove, the installation is high-efficient, time saving and labor saving, can reduce blast furnace crucible lateral wall temperature disappearance, guarantee that blast furnace crucible erosion monitoring can normally go on, judge the crucible operating condition with directly perceived complete data for the ironmaking worker and change, guarantee production safety.
The position of the opening corresponds to the gap between two adjacent cooling walls, so that the cooling walls are prevented from being damaged.
Step N1 is described in detail.
And (4) opening a hole on the furnace shell to obtain a sleeve.
When the position of the opening is determined, the sleeve is inserted into the opening and is welded with the furnace shell, so that the material is saved.
A through hole is formed in the center of the sleeve, the diameter of the through hole is matched with that of a protection tube of a new thermocouple, and the protection tube is guaranteed to pass through.
Carry out the trompil on the furnace skin through magnetic drill, before the trompil, at two supporting seats of top welding of trompil position, utilize safety rope hoist and mount magnetic drill, prevent that magnetic drill from dropping.
When the magnetic drill is used for drilling holes on the furnace shell, the magnetic drill is electrified and vertically adsorbed at the position of the furnace shell hole, the magnetic drill is fixed, the position of a base of the magnetic drill is marked, a hollow drill bit with the cutting depth of 100mm and the diameter of 25mm is installed, the furnace shell at the damaged thermocouple position is cut off, and water cooling is carried out in the cutting process.
Step N2 is described in detail.
Specifically, when the temperature value is less than the threshold value, the slurry layer in the furnace shell needs to be cut continuously; when the temperature value is equal to the threshold value, the cutting position is the new thermocouple installation position.
The slurry layer in the furnace shell is cut at the position of the opening by the magnetic drill, and when the cutting is carried out, the hollow drill is replaced by the twist drill with the cutting depth position of 300-500mm and the diameter of 3-5 mm.
The grouting material near the couple in the furnace shell is slowly cut off through the magnetic drill, and in the cutting process, the magnetic drill is noticed to keep the power-on state, and the position and the cutting precision of the magnetic drill are influenced by strictly prohibiting the power off. After cutting to a certain depth, a new thermocouple is deeply inserted into the position of the opening to measure the temperature in the furnace skin. And positioning the new thermocouple insertion depth according to the damaged thermocouple insertion depth, but stopping cutting when the temperature of the foremost end of the opening reaches 50 ℃ to prevent the cutting depth from excessively damaging the complete structure of the carbon brick on the side wall of the hearth, namely the new thermocouple insertion position.
Specifically, when the hole is opened, grouting material powder in the hole is cleaned, and the hole is guaranteed to be clean. In this embodiment, a strong suction cleaner with a long conduit is used to empty the grout powder from the opening
Step N3 is described in detail.
Specifically, inserting a new thermocouple into the installation location of the new thermocouple comprises the steps of:
and fixedly arranging the metal sleeve of the new thermocouple on the furnace shell.
And a first flange is fixedly arranged at the end part of the metal sleeve of the new thermocouple, which is far away from the furnace shell.
And fixedly mounting a protection tube on the second flange plate, inserting a new thermocouple into the protection tube, and inserting the new thermocouple into the hole by penetrating the protection tube through the metal sleeve of the new thermocouple.
And when the new thermocouple reaches the installation position, fastening the second flange plate with the first flange plate, positioning the new thermocouple through fastening the second flange plate with the first flange plate, and sealing.
Wherein, a new thermocouple sheathed with a protection tube is inserted into the opening position, and is required to be slowly inserted. The front end of the protection tube is of a flat structure, the thermocouple is strictly prevented from bending in the insertion process, and a single thermocouple or a plurality of new thermocouples are inserted according to the arrangement of damaged thermocouples.
The length of the metal sleeve of the new thermocouple is 300 and 500 mm.
The metal sleeve and the protection tube of the novel thermocouple are coaxial with the hole, so that the installation precision is ensured.
When the second flange plate is fastened with the first flange plate, the polyester grouting material is injected into gaps among the metal sleeve of the new thermocouple, the protection tube and the carbon brick through the grouting hole of the metal sleeve of the new thermocouple, and the sealing performance is guaranteed.
Wherein, the grouting pressure is controlled at 2.0MPa, the grouting process is slowly pressurized, and the grouting is stopped when the specified pressure is reached; and maintaining the pressure for 30min, grouting again after the pressure is reduced, and stopping grouting for multiple times until the pressure is kept unchanged for 30 min.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. An on-line installation method of a blast furnace hearth thermocouple is characterized by comprising the following steps:
cutting off the metal sleeve of the damaged thermocouple;
forming a hole in the furnace shell, wherein the position of the hole corresponds to the position of the damaged thermocouple;
cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting to obtain a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple;
drawing out the damaged thermocouple;
a new thermocouple is inserted into the installation location of the new thermocouple.
2. The online installation method of the blast furnace hearth thermocouple according to claim 1, characterized in that:
opening a hole on the furnace shell to obtain a sleeve;
when the damaged thermocouple is extracted, the sleeve is inserted into the hole and welded with the furnace shell.
3. The online installation method of the blast furnace hearth thermocouple according to claim 1, characterized in that:
when the temperature value is less than the threshold value, the slurry layer in the furnace shell needs to be cut continuously;
when the temperature value is equal to the threshold value, the cutting position is the new thermocouple installation position.
4. The online installation method of the blast furnace hearth thermocouple according to claim 1, characterized in that:
and when the damaged thermocouple is extracted, cleaning the grouting material powder in the hole.
5. The on-line installation method of a blast furnace hearth thermocouple according to claim 1, wherein said inserting a new thermocouple into an installation position of the new thermocouple comprises the steps of:
fixedly arranging a metal sleeve of a new thermocouple on a furnace shell;
a first flange plate is fixedly arranged at the end part of the metal sleeve of the new thermocouple, which is far away from the furnace shell;
fixedly mounting a protection tube on the second flange plate, inserting a new thermocouple into the protection tube, and inserting the new thermocouple into the hole by the protection tube penetrating through a metal sleeve of the new thermocouple;
when the new thermocouple reaches the mounting position, the second flange is fastened to the first flange.
6. The online installation method of the blast furnace hearth thermocouple according to claim 5, characterized in that:
the metal sleeve and the protective tube of the new thermocouple are coaxial with the bore.
7. The online installation method of the blast furnace hearth thermocouple according to claim 5, characterized in that:
when the second flange plate is fastened with the first flange plate, the polyester grouting material is injected into gaps among the metal sleeve of the new thermocouple, the protection tube and the carbon brick through the grouting hole of the metal sleeve of the new thermocouple.
8. An on-line installation method of a blast furnace hearth thermocouple is characterized by comprising the following steps:
determining the nearest position to the damaged thermocouple according to the design of the blast furnace, and opening a hole at the position;
cutting the grouting material layer in the furnace shell at the hole opening position, measuring the temperature through a new thermocouple when cutting to obtain a temperature value, and comparing the temperature value with a threshold value to determine the installation position of the new thermocouple;
a new thermocouple is inserted into the installation location of the new thermocouple.
9. The online installation method of the blast furnace hearth thermocouple according to claim 8, characterized in that:
the position of the opening corresponds to the gap between two adjacent cooling walls.
10. The online installation method of the blast furnace hearth thermocouple according to claim 8, characterized in that:
opening a hole on the furnace shell to obtain a sleeve;
when the position of the opening is determined, inserting the sleeve into the opening and welding the sleeve with the furnace shell;
the center of the sleeve is provided with a through hole, and the diameter of the through hole is matched with that of the protection tube of the new thermocouple.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010663586.5A CN111809013A (en) | 2020-07-10 | 2020-07-10 | Online installation method for blast furnace hearth thermocouple |
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| CN202010663586.5A CN111809013A (en) | 2020-07-10 | 2020-07-10 | Online installation method for blast furnace hearth thermocouple |
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| JP2001234217A (en) * | 2000-02-28 | 2001-08-28 | Nippon Steel Corp | Estimation and prediction method for blast furnace bottom condition |
| CN101504319A (en) * | 2009-03-02 | 2009-08-12 | 莱芜钢铁股份有限公司 | Blast furnace online small-bore micro-damage furnace hearth side wall temperature detection method |
| CN202954056U (en) * | 2012-10-19 | 2013-05-29 | 宝山钢铁股份有限公司 | Blast furnace body brick lining temperature measuring device |
| CN203602646U (en) * | 2013-12-13 | 2014-05-21 | 陈靖 | Thermocouple protection device for blast furnace |
| CN204224628U (en) * | 2014-11-24 | 2015-03-25 | 上海宝盈工业炉窑工程有限公司 | The thermopair that a kind of blast furnace hearth is installed online |
| CN105624354A (en) * | 2016-04-06 | 2016-06-01 | 安徽工业大学 | Mounting method of blast furnace hearth bottom temperature thermocouple |
| CN105671232A (en) * | 2016-04-06 | 2016-06-15 | 安徽工业大学 | Online installation process of iron-smelting blast furnace thermocouple |
-
2020
- 2020-07-10 CN CN202010663586.5A patent/CN111809013A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001234217A (en) * | 2000-02-28 | 2001-08-28 | Nippon Steel Corp | Estimation and prediction method for blast furnace bottom condition |
| CN101504319A (en) * | 2009-03-02 | 2009-08-12 | 莱芜钢铁股份有限公司 | Blast furnace online small-bore micro-damage furnace hearth side wall temperature detection method |
| CN202954056U (en) * | 2012-10-19 | 2013-05-29 | 宝山钢铁股份有限公司 | Blast furnace body brick lining temperature measuring device |
| CN203602646U (en) * | 2013-12-13 | 2014-05-21 | 陈靖 | Thermocouple protection device for blast furnace |
| CN204224628U (en) * | 2014-11-24 | 2015-03-25 | 上海宝盈工业炉窑工程有限公司 | The thermopair that a kind of blast furnace hearth is installed online |
| CN105624354A (en) * | 2016-04-06 | 2016-06-01 | 安徽工业大学 | Mounting method of blast furnace hearth bottom temperature thermocouple |
| CN105671232A (en) * | 2016-04-06 | 2016-06-15 | 安徽工业大学 | Online installation process of iron-smelting blast furnace thermocouple |
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Application publication date: 20201023 |
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| RJ01 | Rejection of invention patent application after publication |