CN114317879B - Method for controlling mouth-melting oxygen lance - Google Patents
Method for controlling mouth-melting oxygen lance Download PDFInfo
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- CN114317879B CN114317879B CN202210093398.2A CN202210093398A CN114317879B CN 114317879 B CN114317879 B CN 114317879B CN 202210093398 A CN202210093398 A CN 202210093398A CN 114317879 B CN114317879 B CN 114317879B
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Abstract
The invention discloses a method for controlling a converter mouth oxygen lance, which relates to the technical field of steel production, and is characterized in that the thickness of converter mouth sticky slag at different positions is continuously measured by a laser ranging device arranged at the center of a multi-channel converter mouth oxygen lance spray pipe, the temperature of the converter mouth sticky slag at different positions is continuously measured by an infrared temperature measuring device arranged at the center of the multi-channel converter mouth oxygen lance spray pipe, and the oxygen supply intensity of each channel in the multi-channel converter mouth oxygen lance is controlled in real time according to the thickness of the converter mouth sticky slag and the temperature distribution state. The thickness and the temperature of the slag adhered to the converter mouth of the converter at different positions are measured in real time, and according to the thickness and the temperature distribution state of the slag adhered to the converter mouth of the converter, a slag removal control system of the converter mouth forms a multi-runner oxygen lance control strategy, and adjusts the oxygen supply strength of each runner in the multi-runner oxygen lance in real time, so that the fast removal of the slag adhered to the converter mouth of the converter and the efficient protection of the structure of the converter mouth of the converter are realized.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for controlling a mouth oxygen lance.
Background
The removal of the slag adhered to the converter mouth of the converter is one of the important tasks of the structural maintenance of the converter, the production process of the converter is influenced by factors such as the fluctuation of the components of raw and auxiliary materials, the structural change of the converter during the 'front-middle-rear' period of the converter smelting, the different selective oxidation reaction rates of all elements in a molten pool and the like, the slag is easy to return to dryness and splash during the smelting process, the slag adhering phenomenon at the converter mouth of the converter is frequent, and the smelting rhythm and the safe production of the converter are seriously influenced. At present, two methods of mechanical special equipment or oxygen lance oxygen supply and blowing are commonly used at home and abroad to clean the slag adhered to the converter mouth.
The mechanical special equipment method utilizes larger cutting force and impact force to physically damage the slag adhered to the converter mouth, so that the adhered slag is separated from the converter mouth. Due to the interaction and transmission of force, in the process of cleaning the slag adhered on the converter mouth by mechanical special equipment, the converter mouth structure generates micro-deformation under the action of mechanical force, and the formed local stress concentration damages the stability and safety of the converter mouth structure.
The oxygen lance oxygen supply purging method utilizes rapid oxygen to directly impact furnace mouth sticky slag, utilizes the principle of oxidation heat release to improve the temperature of the sticky slag, converts solid sticky slag into molten flowing slag, and the molten flowing slag is physically separated from the furnace mouth of the converter under the combined action of oxygen impact force and gravity. In the oxygen supply and purging process of the oxygen lance, the impact force of the rapid oxygen jet is far smaller than the mechanical force generated by a mechanical special equipment method, and the water cooling structure of the converter mouth can effectively reduce the temperature of the converter mouth. Therefore, compared with a mechanical special equipment method, the oxygen lance oxygen supply sweeping method can protect the stability and the safety of the converter mouth structure of the converter. However, the traditional oxygen lance oxygen supply purging method lacks an effective process oxygen flow control means, is influenced by the instability of the position and the thickness of the slag adhered to the converter mouth, greatly reduces the oxygen utilization efficiency, and inhibits the quick and efficient cleaning of the slag adhered to the converter mouth.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a method for controlling a converter mouth oxygen lance, which continuously measures the thickness of the converter mouth sticky slag at different positions through a laser distance measuring device arranged at the center of a multi-channel converter mouth oxygen lance spray pipe, continuously measures the temperature of the converter mouth sticky slag at different positions through an infrared temperature measuring device arranged at the center of the multi-channel converter mouth oxygen lance spray pipe, and controls the oxygen supply intensity of each channel in the multi-channel converter mouth oxygen lance in real time according to the thickness and the temperature distribution state of the converter mouth sticky slag, and specifically comprises the following steps:
s1, installing a set of laser distance measuring device and a set of infrared temperature measuring device in the center of a multi-runner furnace mouth oxygen lance spray pipe;
s2, transmitting the thickness of the sticky slag of the furnace mouth at different positions measured by the laser ranging device to a furnace mouth slag removal control system in real time, and acquiring and analyzing the thickness signals of the sticky slag of the furnace mouth at different positions in real time by the furnace mouth slag removal control system to determine the basic oxygen supply strength of each flow channel of the multi-flow-channel furnace mouth oxygen lance;
and S3, transmitting the temperatures of the sticky slag of the furnace mouths at different positions measured by the infrared temperature measuring devices to a furnace mouth slag removal control system in real time, and acquiring and analyzing the temperature signals of the sticky slag of the furnace mouths at different positions by the furnace mouth slag removal control system in real time to determine the additional oxygen supply strength of each flow passage of the multi-flow-passage furnace mouth oxygen lance.
The invention further defines the technical scheme that:
the method for controlling the mouth oxygen lance comprises the following steps of S2:
s2.1, before the slag at the converter mouth of the converter is cleaned, adjusting the multi-runner converter mouth oxygen lance to a working position by a converter mouth slag cleaning control system;
s2.2, after the multi-runner furnace mouth oxygen lance is adjusted to a working position, a furnace mouth slag removal control system starts a laser ranging device;
s2.3, when the slag at the converter mouth of the converter begins to be removed, adjusting the oxygen supply intensity of each flow channel of the multi-flow-channel converter mouth oxygen lance to a preset oxygen supply intensity by a converter mouth slag removal control system;
s2.4, after the oxygen supply amount of each flow channel of the multi-flow-channel converter mouth oxygen lance is adjusted to a preset flow rate, the fast oxygen jet flows to the surface of the converter mouth sticky slag to form a measurement light path channel, and the laser ranging device measures the thickness of the converter mouth sticky slag at different positions in real time along the measurement light path channel;
s2.5, determining basic oxygen supply intensity strategies of all runners of the multi-runner tuyere oxygen lance by a tuyere slag removal control system according to the tuyere slag bonding thickness signals at different positions.
The method for controlling the mouth oxygen lance comprises the following steps in step S3:
s3.1, after the furnace mouth slag removal control system receives the first group of furnace mouth slag-sticking thickness signals, starting an infrared temperature measuring device;
s3.2, measuring the temperature of the slag adhered to the furnace mouth at different positions in real time by an infrared temperature measuring device along a measuring light path channel formed by the rapid oxygen jet;
and S3.3, determining an additional oxygen supply intensity strategy of each flow channel of the multi-flow-channel furnace mouth oxygen lance by the furnace mouth slag removal control system according to the difference value between the furnace mouth slag bonding temperature signals at different positions and the maximum heating temperature of the furnace mouth slag bonding and in combination with the oxygen supply flow determined by the basic oxygen supply strategy.
In the furnace mouth oxygen lance control method, the multi-runner furnace mouth oxygen lance comprises 6 to 12 oxygen supply runners which are uniformly arranged, and the geometric structures of the oxygen supply runners are the same; the set of laser range finder comprises 6-24 laser range finders, the set of infrared temperature measuring device comprises 6-24 infrared temperature measuring devices, and the oxygen supply flow channel is provided with 1-2 laser range finders and 1-2 infrared temperature measuring devices; the maximum heating temperature range of the preset furnace mouth slag is 1350-1680 ℃, and is determined according to the nominal capacity of the converter and the structure of the wet dust removal flue.
In the method for controlling the converter mouth oxygen lance, the measurement error of the laser range finder is less than or equal to +/-0.1 mm, and the basic oxygen supply intensity strategy is updated every 3 s.
In the method for controlling the converter mouth oxygen lance, the measurement error of the infrared thermometer is less than or equal to +/-5 percent, and the strategy of the additional oxygen supply intensity is updated every 1 s.
In the furnace mouth oxygen lance control method, the furnace mouth slag removal control system forms the determination frequency of each flow channel basic oxygen supply intensity strategy and the additional oxygen supply intensity strategy of the multi-flow channel furnace mouth oxygen lance to be more than or equal to 5 sets/s.
The invention has the beneficial effects that:
(1) The method adopts the laser ranging and infrared temperature measurement technology to measure the thickness and the temperature of the slag adhered to the converter mouth in real time, analyzes the thickness and the temperature distribution state of the slag adhered to the converter mouth, determines the dynamic control strategy of oxygen supply intensity, dynamically and accurately controls the oxygen supply intensity of each flow passage of the multi-flow-passage oxygen lance to finish the quick, efficient and safe removal of the slag adhered to the converter mouth by the multi-flow-passage oxygen lance;
(2) The oxygen supply amount required by the multi-runner melting furnace mouth oxygen lance is reduced by more than 20 percent, the time for removing the slag adhered to the furnace mouth of the converter is improved by more than 18 percent, and the average deformation of the structure of the furnace mouth of the converter is less than 0.02 mm/time.
Drawings
FIG. 1 is a schematic control flow diagram of the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention;
FIG. 3 is a schematic layout view of a laser range finder and an infrared thermometer at the head of the multi-channel mouth oxygen lance of the present invention;
wherein: 1. a converter; 2. a multi-channel mouth oxygen lance; 2-1, laser range finder; 2-2, an infrared thermometer; 2-3, and oxygen supplying runners of the oxygen lance with the multi-runner furnace mouth.
Detailed Description
Example 1
The method for controlling the converter mouth oxygen lance provided by the embodiment comprises the steps of continuously measuring the thickness of converter mouth sticky slag at different positions through a laser ranging device arranged at the center of a multi-channel converter mouth oxygen lance spray pipe, continuously measuring the temperature of the converter mouth sticky slag at different positions through an infrared temperature measuring device arranged at the center of the multi-channel converter mouth oxygen lance spray pipe, and controlling the oxygen supply intensity of each channel in the multi-channel converter mouth oxygen lance in real time according to the thickness and the temperature distribution state of the converter mouth sticky slag, as shown in fig. 1-3, and specifically comprises the following steps:
s1, installing a set of laser distance measuring device and a set of infrared temperature measuring device in the center of a multi-runner furnace mouth oxygen lance spray pipe;
s2, the thickness of the sticky slag of the furnace mouth at different positions measured by the laser ranging device is transmitted to the furnace mouth slag removal control system in real time, the furnace mouth slag removal control system collects and analyzes the thickness signals of the sticky slag of the furnace mouth at different positions in real time, and the basic oxygen supply strength of each flow channel of the multi-flow-channel furnace mouth oxygen lance is determined, and the method specifically comprises the following steps:
s2.1, before the slag at the converter mouth of the converter is cleaned, adjusting the multi-runner converter mouth oxygen lance to a working position by a converter mouth slag cleaning control system;
s2.2, after the multi-runner furnace mouth oxygen lance is adjusted to a working position, a furnace mouth slag removal control system starts a laser ranging device;
s2.3, when the slag at the converter mouth of the converter begins to be removed, adjusting the oxygen supply intensity of each flow channel of the multi-flow-channel converter mouth oxygen lance to a preset oxygen supply intensity by a converter mouth slag removal control system;
s2.4, after the oxygen supply amount of each flow channel of the multi-flow-channel converter mouth oxygen lance is adjusted to a preset flow rate, the fast oxygen jet flows to the surface of the converter mouth sticky slag to form a measurement light path channel, and the laser ranging device measures the thickness of the converter mouth sticky slag at different positions in real time along the measurement light path channel;
s2.5, determining a basic oxygen supply intensity strategy of each flow channel of the multi-flow-channel mouth oxygen lance by a mouth slag removal control system according to the mouth sticky slag thickness signals at different positions;
s3, the temperature of the sticky slag of the furnace mouth at different positions measured by the infrared temperature measuring device is transmitted to the furnace mouth slag removal control system in real time, the furnace mouth slag removal control system collects and analyzes temperature signals of the sticky slag of the furnace mouth at different positions in real time, and the additional oxygen supply strength of each flow channel of the multi-flow-channel furnace mouth oxygen lance is determined, and the method specifically comprises the following steps:
s3.1, after the furnace mouth slag removal control system receives the first group of furnace mouth slag-sticking thickness signals, starting an infrared temperature measuring device;
s3.2, measuring the temperature of the slag adhered to the furnace mouth at different positions in real time by an infrared temperature measuring device along a measuring light path channel formed by the rapid oxygen jet;
and S3.3, determining an additional oxygen supply intensity strategy of each flow channel of the multi-flow-channel furnace mouth oxygen lance by the furnace mouth slag removal control system according to the difference value between the furnace mouth slag bonding temperature signals at different positions and the maximum heating temperature of the furnace mouth slag bonding and in combination with the oxygen supply flow determined by the basic oxygen supply strategy.
The measurement error of the laser range finder is less than or equal to +/-0.1 mm, and the basic oxygen supply intensity strategy is updated every 3 s. The measurement error of the infrared thermometer is less than or equal to +/-5 percent, and the additional oxygen supply intensity strategy is updated every 1 s. The furnace mouth slag removal control system forms the determination frequency of each flow channel basic oxygen supply intensity strategy and the additional oxygen supply intensity strategy of the multi-flow channel furnace mouth oxygen lance to be more than or equal to 5 sets/s.
The method is applied to a 100-ton dephosphorization metallurgical converter, the multi-runner mouth oxygen lance contains 6 oxygen supply runners which are uniformly arranged, a set of laser ranging device containing 6 laser range finders is installed on the multi-runner mouth oxygen lance, a set of infrared temperature measuring device containing 6 infrared temperature measuring instruments is additionally installed on the multi-runner mouth oxygen lance, 1 laser ranging device and 1 infrared temperature measuring instrument are arranged on each oxygen supply runner of the multi-runner mouth oxygen lance, the maximum heating temperature of furnace mouth sticky slag is preset to be 1450 DEG C
After the control method is adopted, the oxygen supply amount required by the multi-runner converter mouth oxygen lance is reduced by 22%, the removal time of the slag adhered at the converter mouth is improved by 19%, and the average deformation of the converter mouth structure is less than 0.003 mm/time.
Example 2
The difference between the method for controlling the tuyere oxygen lance and the embodiment 1 is that the method is applied to a 300-ton conventional metallurgical converter, the multi-runner tuyere oxygen lance contains 12 oxygen supply runners which are uniformly arranged, a set of laser ranging device containing 24 laser ranging instruments is installed on the multi-runner tuyere oxygen lance, a set of infrared temperature measuring device containing 24 infrared temperature measuring instruments is additionally installed, each oxygen supply runner of the multi-runner tuyere oxygen lance is provided with 2 laser ranging instruments and 2 infrared temperature measuring instruments, and the maximum heating temperature of the sticky slag at the tuyere is preset to be 1630 ℃.
After the control method is adopted, the oxygen supply amount required by the multi-runner converter mouth oxygen lance is reduced by 28 percent, the removal time of the slag adhered at the converter mouth is improved by 22 percent, and the average deformation of the converter mouth structure is less than 0.008 mm/time.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A method for controlling an oxygen lance at a furnace mouth is characterized in that: the thickness of the converter mouth sticky slag at different positions is continuously measured by a laser distance measuring device arranged at the center of a multi-runner mouth oxygen lance spray pipe, the temperature of the converter mouth sticky slag at different positions is continuously measured by an infrared temperature measuring device arranged at the center of the multi-runner mouth oxygen lance spray pipe, the oxygen supply intensity of each runner in the multi-runner mouth oxygen lance is controlled in real time according to the thickness and the temperature distribution state of the converter mouth sticky slag,
the multi-runner furnace mouth oxygen lance comprises 6-12 oxygen supply runners which are uniformly arranged, and the geometrical structures of the oxygen supply runners are the same; the set of laser distance measuring devices comprises 6-24 laser distance measuring instruments, the set of infrared temperature measuring devices comprises 6-24 infrared temperature measuring instruments, and the oxygen supply flow channel is provided with 1-2 laser distance measuring instruments and 1-2 infrared temperature measuring instruments;
the method specifically comprises the following steps:
s1, installing a set of laser distance measuring device and a set of infrared temperature measuring device in the center of a multi-runner furnace mouth oxygen lance spray pipe;
s2, transmitting the thickness of the sticky slag of the furnace mouth at different positions measured by the laser ranging device to a furnace mouth slag removal control system in real time, and acquiring and analyzing the thickness signals of the sticky slag of the furnace mouth at different positions in real time by the furnace mouth slag removal control system to determine the basic oxygen supply strength of each flow channel of the multi-flow-channel furnace mouth oxygen lance;
and S3, transmitting the temperature of the sticky slag at the furnace mouth at different positions measured by the infrared temperature measuring device to a furnace mouth slag removal control system in real time, and acquiring and analyzing the temperature signals of the sticky slag at the furnace mouth at different positions in real time by the furnace mouth slag removal control system to determine the additional oxygen supply intensity of each flow channel of the multi-flow-channel furnace mouth oxygen lance.
2. The method for controlling a tuyere oxygen lance of claim 1, which comprises the steps of: the step S2 specifically includes:
s2.1, before the slag at the converter mouth is cleaned, the slag cleaning control system at the converter mouth adjusts the multi-runner converter mouth oxygen lance to a working position;
s2.2, after the multi-runner furnace mouth oxygen lance is adjusted to a working position, a furnace mouth slag removal control system starts a laser ranging device;
s2.3, when the slag at the converter mouth of the converter begins to be removed, adjusting the oxygen supply intensity of each flow channel of the multi-flow-channel converter mouth oxygen lance to a preset oxygen supply intensity by a converter mouth slag removal control system;
s2.4, after the oxygen supply amount of each flow channel of the multi-flow-channel converter mouth oxygen lance is adjusted to a preset flow rate, fast oxygen jet flows to the surface of the converter mouth sticky slag to form a measuring light path channel, and a laser ranging device measures the thickness of the converter mouth sticky slag at different positions in real time along the measuring light path channel;
s2.5, determining a basic oxygen supply strength strategy of each flow channel of the multi-flow-channel mouth oxygen lance by a mouth slag removal control system according to the mouth sticky slag thickness signals at different positions.
3. The method for controlling a tuyere oxygen lance of claim 1, which comprises the steps of: the step S3 specifically includes:
s3.1, after the furnace mouth slag removal control system receives the first group of furnace mouth slag adhering thickness signals, starting an infrared temperature measuring device;
s3.2, measuring the temperature of the slag adhered to the furnace mouth at different positions in real time by an infrared temperature measuring device along a measuring light path channel formed by the rapid oxygen jet;
and S3.3, determining an additional oxygen supply intensity strategy of each flow channel of the multi-flow-channel furnace mouth oxygen lance by the furnace mouth slag cleaning control system according to the difference value between the furnace mouth sticky slag temperature signal at different positions and the maximum heating temperature of the furnace mouth sticky slag and by combining the oxygen supply flow determined by the basic oxygen supply strategy.
4. The method for controlling the tuyere oxygen lance of claim 1, which is characterized in that: the maximum heating temperature range of the preset furnace mouth slag is 1350-1680 ℃, and is determined according to the nominal capacity of the converter and the structure of the wet dust removal flue.
5. The method for controlling a tuyere oxygen lance of claim 4, wherein: the measurement error of the laser range finder is less than or equal to +/-0.1 mm, and the basic oxygen supply intensity strategy is updated every 3 s.
6. The method for controlling a tuyere oxygen lance of claim 4, wherein: the measurement error of the infrared thermometer is less than or equal to +/-5%, and the additional oxygen supply intensity strategy is updated every 1 s.
7. The method for controlling a tuyere oxygen lance of claim 1, which comprises the steps of: the furnace mouth slag removal control system forms the determination frequency of each flow channel basic oxygen supply intensity strategy and each flow channel additional oxygen supply intensity strategy of the multi-flow-channel furnace mouth oxygen lance to be more than or equal to 5 sets/s.
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| JP4455791B2 (en) * | 2001-11-20 | 2010-04-21 | 株式会社神戸製鋼所 | Coating method for refractories in the furnace |
| JP4790502B2 (en) * | 2006-06-09 | 2011-10-12 | 新日本製鐵株式会社 | Blasting method for converter furnace mouth |
| US10400293B2 (en) * | 2014-03-14 | 2019-09-03 | Berry Metal Company | Metal making lance with infrared camera in lance head |
| CN108359765A (en) * | 2018-03-30 | 2018-08-03 | 山东钢铁股份有限公司 | A kind of blowing method for purging converter mouth dry slag |
| CN110146335B (en) * | 2019-06-10 | 2021-09-14 | 中冶赛迪工程技术股份有限公司 | Automatic temperature measurement sampling method for steelmaking converter door |
| CN110804684B (en) * | 2019-10-16 | 2020-08-11 | 北京科技大学 | CO converter2-O2Dynamic control method for temperature of mixed blowing smelting fire point area |
| CN112462378A (en) * | 2020-11-30 | 2021-03-09 | 清华大学 | Laser thickness gauge for converter |
| CN112941265A (en) * | 2021-03-24 | 2021-06-11 | 山东崇盛冶金氧枪有限公司 | Slag splashing furnace protection for converter steelmaking and converter mouth oxygen lance |
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