CN113512626A - Ladle multipoint pulsation type bottom blowing intelligent refining device and method - Google Patents
Ladle multipoint pulsation type bottom blowing intelligent refining device and method Download PDFInfo
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- CN113512626A CN113512626A CN202110440421.6A CN202110440421A CN113512626A CN 113512626 A CN113512626 A CN 113512626A CN 202110440421 A CN202110440421 A CN 202110440421A CN 113512626 A CN113512626 A CN 113512626A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
Abstract
The invention relates to the technical field of molten steel refining in the metallurgical industry, and discloses a ladle multipoint pulsating type bottom blowing intelligent refining device and method. The steel ladle bottom comprises a steel ladle bottom for a plurality of breathable elements, the breathable elements and a PLC control system; the molten steel refining task can be better completed by changing the number, the arrangement and the special pulse blowing system of the air permeable elements, and the refining period is effectively shortened. The technology increases the blowing air quantity and the stirring area by increasing the number of the air permeable elements; under the soft air blowing quantity, the gas disturbance area is increased; by combining the change of the arrangement of the ventilating elements with a pulse blowing system, the slag-metal rolling and mixing effect is enhanced, the contact area of the steel slag and the molten steel is increased, the slag-metal reaction efficiency is improved, the refining period is shortened, and the production efficiency is improved; under different metallurgical processes and field conditions, the PLC control system is used for intelligently selecting the injection air quantity, the number and the arrangement of the air bricks, and the most suitable injection system is adopted, so that the energy consumption is saved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of molten steel refining in the metallurgical industry, and particularly relates to a technology and a device for steel ladle multipoint pulsating bottom blowing intelligent refining.
Background
The iron and steel industry, as an important pillar type basic industry of national economy, plays an indispensable role in production and life and plays an important role in national economic development. In recent years, the nation encourages the development of high-end steel products, and high-quality and high-performance steel products are used for replacing medium and low-grade steel products; with the rapid development of the social industry, the quality requirement of the market on steel products is higher and higher, the quality performance of steel materials is accelerated, and the rapid development and production of clean steel becomes a trend of the modern steel industry. Meanwhile, with the continuous increase of the market competition of steel products, higher requirements are put forward for reducing the production cost, and the production requirements of high-quality low-cost steel are increased day by day. Therefore, how to reduce the content of the inclusions in the molten steel and shorten the refining period become key problems.
The steel industry is a typical process industry, and the quality of a final product is excellent and is determined by all links of the whole process. In terms of producing clean steel, the content of non-metallic inclusions in molten steel needs to be strictly controlled, and the secondary refining process of the molten steel is an important link for realizing the cleaning of steel, wherein the ladle bottom argon blowing technology is widely applied to the refining process of steel as a simple and easy economic means.
The ladle bottom argon blowing technology is a refining technology for blowing argon gas to molten steel from a ladle bottom ventilating element to stir the molten steel. The argon gas is used as an inert gas, does not have any chemical reaction with the molten steel in the metallurgical process, and has extremely low solubility in the molten steel, so the argon gas is the preferred gas for stirring the molten steel. The ladle bottom argon blowing technology has the functions of homogenizing the temperature and the components of molten steel, improving the dynamic condition and accelerating the floating speed of inclusions. But the defects are also obvious, in the current ladle bottom argon blowing process, most enterprises adopt a double-ventilation-element blowing mode, the arrangement angles of ventilation elements are different, and a larger 'dead zone' exists in the argon blowing process; the molten steel turbulence caused by the steady-flow argon injection mode is small, the improvement of the reaction efficiency of the slag metal is not obviously influenced, the refining time is prolonged, the operation period of the whole flow is prolonged, and the production efficiency is reduced; meanwhile, the utilization rate of argon is not high, so that the temperature of molten steel is greatly reduced, the energy consumption is high, and the smelting cost is high. In view of the problems of the prior ladle bottom argon blowing technology, researchers at home and abroad have own consideration, and it is necessary to search for a new ladle bottom blowing refining technology under the background.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a steel ladle multipoint pulse type bottom blowing intelligent refining technology and device, in the steel ladle refining process, argon is blown into molten steel through a plurality of gas permeable elements at the bottom of a steel ladle, a gas flow controller is arranged on an argon branch pipeline of each gas permeable element, the opening and closing time and the opening and closing size of the gas flow controller are controlled through PLC programming, and meanwhile, opening and closing logics are set for different gas flow controllers, so that the argon is output in a pulse type, and relevant data are transmitted back to a PLC control module. Compared with the arrangement of double-ventilation elements, the arrangement mode of the multiple ventilation elements obviously improves the stirring range of argon gas, and greatly reduces the area of a dead zone; meanwhile, the argon flow input in a pulsating mode increases the turbulent kinetic energy of the molten steel, strengthens the heat transfer and mass transfer of a reaction system, accelerates the metallurgical reaction and evens the temperature and the components of the molten steel more quickly; the distribution range of argon bubbles is enlarged in the process of removing impurities by soft blowing, and the method is more beneficial to the polymerization growth and floating removal of the impurities. The multi-point pulse type argon blowing working principle is adopted, so that the smelting mode can shorten the refining period and improve the metallurgical production efficiency; meanwhile, under different metallurgical processes and field conditions, the blowing air quantity, the number of the air bricks and the arrangement can be intelligently selected through the PLC control system, so that the most suitable blowing system is adopted, the utilization rate of argon is improved, the temperature drop of molten steel is reduced, the energy consumption is saved, and the production cost is reduced.
The technical scheme adopted by the invention comprises the following steps:
a ladle multipoint pulsation type bottom blowing intelligent refining device comprises:
a PLC control system: the device is used for changing the blowing quantity and arrangement of the air-permeable elements, the pulsating output of argon flow and the intelligent selection of blowing systems in different procedures;
bottom-blowing air-permeable element: the device is used for blowing argon into molten steel through pipeline transportation to provide stirring energy required by molten steel refining;
the ladle bottom for the multi-ventilation element comprises: for mounting the bottom-blowing ventilating element.
Furthermore, the PLC control module is connected with the gas flow controller through a control signal line.
Furthermore, the PLC control system comprises a PLC control module and a gas flow controller, and the PLC control module is connected with the gas flow controller through a control signal line; the PLC control module respectively controls the opening and closing rhythm of a valve of a single gas flow controller so as to control the number, the time length and the flow of the argon-blowing gas-permeable elements. And the injection system under different metallurgical processes and different field conditions is intelligently optimized by integrating, analyzing and processing the feedback data and the field real-time working conditions.
Further, the number and arrangement of the ventilating elements for argon gas injection can be selectively changed by a gas flow controller in the refining process.
Further, the argon flow is output in a periodic pulsating mode.
Further, the PLC control system sets the gas pulsation period to be 1 s-60 s, the wave peak value of the gas pulsation is 1000NL/min or more, and the wave valley value is 10 NL/min-100 NL/min.
The number of the air permeable elements installed at the bottom of the steel ladle for the multi air permeable elements is at least 3; the bottom blowing ventilating element is provided with at least one through hole channel.
Furthermore, the combination mode of the ladle bottom for the multi-ventilation element and the ventilation element has two modes of plug-in type and embedded type.
The bottom blowing ventilating element is made of refractory materials and is in a shape of a circular truncated cone with a large lower part and a small upper part.
Furthermore, the pore passage is divided into a round hole and a slit, and the round hole is divided into a single hole and a plurality of holes.
Furthermore, the diameter of the single pore channel is set to be 2 mm-10 mm, the diameter of the multiple pore channels is set to be 0.5-6 mm, and the number of the multiple pore channels is 2-200.
Furthermore, the width of the slit is 0.12 mm-0.25 mm, the length is 10 mm-60 mm, and the number is 12-72.
Further, in the tapping process of the converter, the process does not relate to complex metallurgical physical and chemical reactions, at the moment, an injection system is defined through programming, the injection gas amount is 5L/min of a single air permeable module, the gas pressure is 0.2MPa, and at the moment, bottom blowing aims at preventing molten steel leakage of the air permeable module.
Furthermore, when molten steel is alloyed, the blowing gas amount is increased to more than 1000NL/min so as to realize large stirring, strengthen mass transfer of a reaction system, improve the alloying efficiency of the molten steel and shorten the smelting period.
Furthermore, the pulse injection mode is set at the initial stage of LF refining, and the bottom blowing of the multi-ventilation module is realized, so that the gas stirring strength is controlled through the argon gas injection amount (argon gas flow and ventilation module number), the stirring strength is high, the reducing atmosphere in the furnace is easy to form, the slag and gold mixing efficiency is high, the desulfurization reaction is accelerated, the heat transfer of a reaction system is enhanced, the internal temperature field distribution of molten steel is uniform, the electrode heating time is shortened, and the energy is saved.
Further, carry out soft blow in LF refining later stage and remove the inclusion, set for the jetting tolerance and be 100NL/min, many ventilative modules jetting improves the stirring range of argon gas, reduces "dead zone", and the increase bubble is to the adsorption of inclusion in the steel, and inclusion collision polymerization come-up clearance and bubble wake vortex clearance increase simultaneously for inclusion removal rate has improved the molten steel cleanliness factor.
Furthermore, the superiority of the blowing system is solved by coupling the field data of each smelting process and the quality of the steel billet fed back by a PLC system.
The steel ladle multipoint pulse type bottom blowing refining device is adopted to finish the refining treatment of molten steel, and comprises the following steps:
step one, embedding the bottom blowing ventilating element into the bottom of a multi-point bottom blowing steel ladle, wherein the ventilating element is connected with a gas flow controller in a PLC control system through a pipeline with a quick connector, the gas flow controller is installed on a branch of an argon input pipeline, and all argon input pipeline branches are connected in parallel and connected with a main gas supply pipeline; in addition, the gas flow controller is connected with the PLC control module through a control signal line, the gas supply pipeline valve is in an open state all the time, the gas flow controller is in a closed state, and the male and female heads of the quick connector are in a connection state.
And step two, during molten steel refining, opening a gas supply pipeline valve to convey argon to the gas flow controller, and controlling the number of the breathable elements, the argon flow and the argon blowing time by changing the opening and closing rhythm of the gas flow controller through a PLC control module to output argon in a pulsating mode.
And step three, conveying the pulsed output argon to the ventilating elements through a pipeline, and entering the molten steel through a plurality of ventilating elements arranged on the bottom of the multipoint bottom blowing ladle. After the molten steel is refined, the valve of the gas flow controller is closed through the PLC control module, gas supply is finished, then the male and female heads of the quick connector are disconnected, the ladle car is driven away from a refining position, and the ladle is transferred to the next procedure through the crown block.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a multi-point pulse type bottom blowing intelligent refining technology for a steel ladle. The arrangement mode of the multiple air permeable elements expands the stirring range of argon gas flow to molten steel when removing inclusions, so that the contact area of argon gas and the inclusions in the molten steel is increased in a large range, and the polymerization growth and the floating removal of the inclusions are facilitated; the pulsating argon output mode enables the fluctuation of the slag-metal interface to show the alternate strong and weak phenomenon, enhances the slag-metal mixing degree, simultaneously, the argon enters the molten steel from the arrangement mode of the multiple air-permeable elements, increases the slag-metal mixing area, greatly promotes the slag-metal interface reaction by combining the arrangement mode of the multiple air-permeable elements and the pulsating argon output mode, shortens the smelting period and improves the refining efficiency; meanwhile, the blowing system under different working procedures and smelting conditions is intelligently selected through the PLC control system, so that the metallurgical efficiency and the argon utilization rate are improved, the temperature drop of molten steel is reduced, and the energy consumption and the cost of smelting are reduced.
(1) The intelligent jetting mode of argon gas of multiple spot impulse type has improved the argon gas utilization ratio, has reduced the molten steel temperature drop, has reached energy saving, reduction in production cost's effect.
(2) The arrangement mode of the multiple air permeable elements increases the stirring range of argon, improves the removal rate of inclusions in steel, and increases the purity of steel grade.
(3) The pulsating argon blowing improves the reaction efficiency of the slag metal, accelerates the refining time and shortens the smelting period.
(4) The process does not change the original production pattern, only needs to adopt a PLC control system on the bottom of the multi-ventilation-element steel ladle, and has the advantages of convenient installation, simple operation and small occupied area. The device has strong controllability and can be adjusted at any time according to field conditions.
Drawings
FIG. 1 is a schematic view showing the overall composition of a ladle multi-point pulse type bottom-blowing intelligent refining apparatus according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a circular single hole of a ventilation component in example 1 of the present invention;
FIG. 3 is a cross-sectional view of a single hole bottom blowing powder spraying air permeable module of example 1 of the present invention;
FIG. 4 is a schematic view of a circular multi-hole passage of a ventilation member according to example 2 of the present invention;
fig. 5 is a schematic view of a slit-type duct of a ventilation device in example 3 of the present invention;
FIG. 6 is a schematic view of the arrangement of the multiple ventilation elements of example 4 of the present invention (8 ventilation element portion);
fig. 7 is a schematic view of a rotary blowing mode of the ventilating element according to embodiment 5 of the present invention;
FIG. 8 is a diagram showing the effect of the cold physical experiment in example 6 of the present invention.
In the figure: 1, a PLC control system; 11 a PLC control module; 12 a gas flow controller; 13 a control signal line; 21 argon gas input pipe; 22 argon gas output pipe; 23 quick-connect (male and female); 3 a gas permeable element; 4, a steel ladle bottom for a plurality of ventilation elements; 5, steel ladle; 6, a circular single pore channel; 7 a refractory material; 8, circular porous channels; 9 a slit-shaped duct; 10 air chambers.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic view showing the overall composition of a ladle multi-point pulse type bottom-blowing intelligent refining apparatus according to embodiment 1 of the present invention. The drawing comprises a PLC control system 1, a PLC control module 11, a gas flow controller 12, a control signal line 13, an argon input pipeline 21, an argon output pipeline 22, a quick connector 23, a ventilation element 3, a steel ladle bottom 4 for installing multiple ventilation elements and a steel ladle 5. The PLC control device 1, the PLC control module 11, the gas flow controller 12, the control signal wire 13, the argon input pipeline 21, the argon output pipeline 22, the quick connector 23, the ventilation element 3 and the ladle bottom 4 for installing the multiple ventilation elements form the ladle multipoint pulsating type bottom blowing refining device in the embodiment 1 of the invention.
The PLC control system 1 is used for controlling argon flow pulse output, and the main principle is that a PLC control module is connected with a gas flow controller through a control signal line, and the number of breathable elements, the argon flow and the argon blowing time are controlled by changing the opening and closing rhythm of an internal valve of the gas flow controller; the argon input pipeline 21, the argon output pipeline 22 and the quick connector 23 are used for connecting all parts of the equipment; the ventilating element 3 is used for spraying argon gas into the steel ladle, is in a shape of a round table with a small upper part and a big lower part, the lower end of the ventilating element is connected with an argon gas pipeline, the inner part of the ventilating element is made of refractory materials, the outer part of the ventilating element is wrapped by a layer of steel, and at least one through pore channel is arranged on the bottom blowing ventilating element; the ladle bottom 4 for installing the multi-ventilation elements is formed by stacking refractory elements, the number of installation positions of the ventilation elements on the ladle bottom is 3 or more, and the combination mode of the installation positions of the ventilation elements and the ventilation elements has two modes of plug-in type and embedded type.
The argon pipeline is respectively connected with the gas flow controller and the bottom blowing ventilating element. The PLC control module controls the flow of gas to be output in a pulsating mode through the gas flow controller, the pulsation period is 10s, the wave peak value is 1200NL/min, and the wave valley value is 50 NL/min.
The pore canal of the ventilation element is arranged as shown in figures 2 and 3, and is a circular single pore canal, wherein the diameter of the single pore canal is set to be 8mm, and the lower part of the ventilation element is provided with an air chamber.
The method for refining the molten steel by using the steel ladle multi-point pulse type bottom blowing intelligent refining device comprises the following specific steps:
the method comprises the following steps: the assembly of the device was carried out according to the device diagram shown in fig. 1, with the parts connected by argon gas lines, the gas supply valve being open and the internal valves of all gas flow controllers being closed, and the gas tightness of the device and the patency of the lines being monitored.
Step two: when the ladle enters the refining station, the argon pipeline is connected with the argon output pipeline under the ladle gas permeable brick through the quick connector, and the argon is conveyed to the gas flow controller of the PLC control system.
Step three: the opening degree and the opening and closing rhythm of an internal valve of the gas flow controller are changed through the PLC control module, so that argon flow is output in a pulsating mode, then argon is conveyed to the position of the breathable element through a pipeline, and molten steel is injected into the device through the breathable element. In the molten steel alloying procedure, the opening degree of a valve of the gas flow controller is controlled to be increased so as to increase the output of argon flow and ensure that the alloy material and the molten steel are fully mixed; in the process of removing the impurities, the output of argon flow is reduced, the number of air-permeable elements for argon blowing is increased, the impurities are removed by soft blowing in a wider range, and the collision polymerization and floating removal of the impurities are accelerated; on the other hand, argon is output in a pulse mode, so that the turbulent kinetic energy is improved, the slag-metal interface is alternately fluctuated in a strong and weak mode, the slag-metal mixing degree is improved, and the slag-metal reaction is accelerated.
Example 2
In this embodiment, the apparatus shown in fig. 1 is used to perform molten steel refining treatment, in this embodiment, 4 permeable elements distributed at 90 degrees are laid at the bottom of the ladle, and the distance between the permeable element and the central point of the ladle is 0.5R, where R is the radius of the bottom of the ladle.
As shown in fig. 4, the cells of the gas permeable element 3 are arranged in a circular multi-cell arrangement, wherein the radius of the cells 8 is 0.5mm and the number of the cells is 151.
Example 3
In this example, the molten steel refining treatment was carried out by using the apparatus shown in FIG. 1, and in this example, the pulsation cycle was 5 seconds, the peak air flow rate was 1000NL/min, and the valley air flow rate was 50 NL/min.
As shown in fig. 5, the duct of the ventilation element is slit-shaped, the width of the slit is 0.15mm, the length of the slit is 50mm, and the number of the slits is 18.
Example 4
In the embodiment, the device shown in figure 1 is adopted to carry out molten steel refining treatment, in the embodiment, the pulsation period is 10s, the peak airflow is 1000NL/min, the trough airflow is 60NL/min, the mounting position of the ventilating element is 0.5R away from the center of the bottom of the ladle, and R is the radius of the bottom of the ladle.
As shown in figure 6, the minimum unit is 45 degrees, the ladle bottom is 8 blocks of ventilation elements, the PLC control module is used for controlling the opening and closing of the gas flow controller, the utilization rate of the ventilation elements is kept to be 3 blocks or more, 23 different blowing modes can be seen, and the requirement of arrangement of the ventilation elements on site can be fully met.
Example 5
In the embodiment, the device shown in fig. 1 is adopted to carry out molten steel refining treatment, in the embodiment, the pulsation period is 1s, the peak airflow is 1000NL/min, the trough airflow is 10NL/min, the number of the air permeable elements installed at the bottom of the ladle is 8, the angle between each air permeable element is 45 degrees, the distance between each air permeable element and the center of the bottom of the ladle is 0.55R, and R is the radius of the bottom of the ladle.
As shown in fig. 7, in the molten steel refining process, argon gas is blown to the molten steel one by one or in blocks by the gas permeable elements in the order of (1) to (8), and the blowing time of each gas permeable element (group) is 1s, that is, one pulse cycle. Make the argon gas be the vortex formula through the jetting mode of rotation formula and disturb the molten steel, it is stronger to the volume effect of mixing of slag, simultaneously under the disturbance scope increase's of bubble the condition, improved the argon gas utilization ratio to reduce the molten steel temperature drop, reached the effect of practicing thrift energy consumption reduction in production cost.
Example 6
In the embodiment, a device shown in figure 1 is adopted to carry out a cold physical experiment in the process of blowing argon from the bottom of the ladle, in the embodiment, a water model means is used for simulating slag-metal coil mixing in the refining process, the ratio of the model to the ladle entity is 1:6, the total flow rate of bottom blowing is set to be 20NL/min, the similar standard number is calculated by a Fred number, and molten steel is simulated by water and a slag layer is simulated by oil.
As shown in fig. 8, (a) and (b) are different arrangements of the double-ventilation module, and (c) and (d) are blowing of the 4-ventilation module, and the multiple-ventilation module improves the gas disturbance range under the condition of certain gas flow, brings larger turbulent kinetic energy to liquid, increases the slag-metal entrainment degree, improves the slag-metal interface reaction, and shortens the smelting time. Regarding (c) and (d), (c) is a steady flow type blowing mode, and (d) is a pulse type blowing mode, wherein the pulse type blowing mode further improves the slag and gold volume mixing degree and improves the dynamic conditions in the reactor.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a ladle multiple spot pulsation formula bottom blowing intelligent refining device which characterized in that includes:
a PLC control system: the device is used for changing the blowing quantity and arrangement of the air-permeable elements, the pulsating output of argon flow and the intelligent selection of blowing systems in different procedures;
bottom-blowing air-permeable element (3): the device is used for blowing argon into molten steel through pipeline transportation to provide stirring energy required by molten steel refining; ladle bottom (4) for a multi-permeable element: for mounting a bottom-blowing ventilating element (3).
2. The ladle multipoint pulse type bottom blowing intelligent refining device according to claim 1, wherein the PLC control system comprises a PLC control module (11) and a gas flow controller (12), and the PLC control module and the gas flow controller are connected through a control signal line (13); the PLC control module respectively controls the opening and closing rhythm of a valve of a single gas flow controller so as to control the number, the time length and the flow of the argon-blowing gas-permeable elements (3).
3. The ladle multipoint pulse type bottom blowing intelligent refining device according to claim 1, wherein the gas pulse period set by the PLC control system is 1 s-60 s, the wave peak value of the gas pulse is 1000NL/min or more, and the wave valley value is 10 NL/min-100 NL/min.
4. The ladle multi-point pulse type bottom-blowing intelligent refining device according to claim 1, wherein the number of the multi-gas permeable elements mounted with the ladle bottom (4) is at least 3; the bottom blowing ventilating element is provided with at least one through hole channel.
5. The ladle multi-point pulse type bottom-blowing intelligent refining device according to claim 1, wherein the bottom-blowing gas permeable elements are made of refractory materials, and a gas flow controller (12) is installed on an argon gas pipeline branch of each gas permeable element.
6. The ladle multipoint pulsation type bottom-blowing intelligent refining device according to claim 1, wherein the bottom-blowing gas permeable element (3) is connected with the gas flow controller (12) through an argon gas pipeline, a quick connector (23) is arranged in the middle of the argon gas pipeline, the quick connector is provided with a male connector and a female connector, the male connector and the female connector of the quick connector are in butt joint to enable argon gas to smoothly pass through during ladle refining, and the male connector and the female connector are disconnected when the ladle leaves a refining position for crown block adjustment and transportation.
7. The ladle multipoint pulsating type bottom-blowing intelligent refining device according to claim 1, wherein the pore passage is divided into a circular hole and a slit, and the circular hole is divided into a single hole and a plurality of holes; the diameter of the single pore channel is set to be 2-10 mm, the diameter of the multiple pore channels is set to be 0.5-6 mm, and the number of the multiple pore channels is 2-200; the width of the slit is 0.12 mm-0.25 mm, the length is 10 mm-60 mm, and the number is 12-72.
8. The method for carrying out ladle multipoint pulse type bottom blowing intelligent refining by adopting the device of claim 1 is characterized by comprising the following steps:
step one, embedding the bottom blowing breathable element (3) into a ladle bottom (4) for a plurality of breathable elements, connecting the breathable elements with a gas flow controller (12) in a PLC control system through a pipeline with a quick connector (23), installing the gas flow controller on a branch of an argon input pipeline (21), and connecting all argon input pipeline branches in parallel with a main gas supply pipeline; in addition, the gas flow controller is connected with the PLC control module (11) through a control signal line (13), at the moment, a gas supply pipeline valve is in an open state all the time, the gas flow controller is in a closed state, and a male head and a female head of the quick connector are in a connection state;
step two, during molten steel refining, opening a gas supply pipeline valve to convey argon to a gas flow controller, and controlling the number of the gas permeable elements, the flow of the argon and the argon injection time by changing the opening and closing rhythm of the gas flow controller through a PLC (programmable logic controller) control module to output argon in a pulsating mode; setting a pulse blowing mode at the initial stage of LF refining, bottom blowing by a plurality of air-permeable elements, and controlling the gas stirring intensity through the injection amount of argon; soft blowing is carried out to remove impurities in the later stage of LF refining, the blowing gas amount is set to be 100NL/min, and a plurality of air-permeable elements are blown, so that the stirring range of argon is improved, and the dead zone is reduced;
and step three, conveying the pulsed output argon to a ventilating element through a pipeline, allowing the argon to enter molten steel through the ventilating element arranged on the ladle bottom (4) for the ventilating element, closing a valve of a gas flow controller through a PLC (programmable logic controller) control module after the molten steel is refined, ending gas supply, disconnecting a male head and a female head of a quick connector, driving a ladle car away from a refining position, and transferring the ladle to the next process through a crown block.
9. The method for carrying out the ladle multipoint pulsation type bottom blowing intelligent refining by adopting the device as claimed in claim 1 is characterized in that in the converter tapping process, the blowing gas amount is 5L/min of a single ventilating element, the gas pressure is 0.2MPa, and the bottom blowing purpose is the molten steel leakage prevention of the ventilating module.
10. The method for carrying out the steel ladle multi-point pulse type bottom blowing intelligent refining by adopting the device as claimed in claim 1 is characterized in that during steel liquid alloying, the blowing gas amount is increased to more than 1000NL/min so as to realize large stirring, strengthen the mass transfer of a reaction system, improve the steel liquid alloying efficiency and shorten the smelting period.
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