CN215887123U - Argon bottom blowing control device for ladle refining furnace based on spectrum identification - Google Patents
Argon bottom blowing control device for ladle refining furnace based on spectrum identification Download PDFInfo
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- CN215887123U CN215887123U CN202121808536.8U CN202121808536U CN215887123U CN 215887123 U CN215887123 U CN 215887123U CN 202121808536 U CN202121808536 U CN 202121808536U CN 215887123 U CN215887123 U CN 215887123U
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Abstract
The utility model provides a be based on spectral identification ladle refining furnace argon gas bottom blowing controlling means, including spectrum flame intensity detector, fix on the artifical observation hole on the water-cooled furnace lid of LF furnace body, the camera lens direction is aimed at the interior argon gas of LF furnace and is tumbled the region, still include argon gas flow control valve, argon gas mass flow meter, first PID regulator and second PID regulator, spectrum flame intensity detector is connected with the feedback signal input of first PID regulator, the output of first PID regulator is connected with the given signal input of second PID regulator, argon gas mass flow meter is connected with the feedback signal input of second PID regulator, argon gas flow control valve is connected to the output of second PID regulator. The method has the advantages that the spectral luminous intensity of the surface of the slag in the argon blowing area in the LF furnace is detected in real time, the flow of argon is adjusted, and the surface light intensity of the slag layer is controlled within a certain range, so that the molten steel is not exposed, the optimal slag overturning effect can be achieved, and the optimal molten steel stirring effect can be obtained with the lowest argon consumption.
Description
Technical Field
The utility model relates to the technical field of ladle refining furnace control of iron and steel enterprises, in particular to a ladle refining furnace argon bottom blowing control device based on spectrum identification.
Background
In the steelmaking process, inclusions in molten steel are important factors influencing the quality of the molten steel. In order to reduce the content of inclusions in molten steel, argon blowing (nitrogen or carbon dioxide blowing may be performed according to the type of steel to be smelted) is generally adopted to promote the inclusions in the molten steel to float upwards, and simultaneously, the components and the temperature of the molten steel can be homogenized. The argon blowing process plays a key role in the quality of subsequent finished steel, and if the argon supply is unstable, the quality of the finished steel is poor, defective products and waste products are caused, and the quality accident of slag inclusion is serious. At present, argon blowing control of a steel-making enterprise is relatively simple, argon generated by an argon station is directly conveyed to an argon blowing port at the bottom of a steel ladle through a conveying pipeline, the argon station outputs in two paths simultaneously, argon operators manually give the argon flow of each path, the slag overturning condition is observed through peepholes in an LF furnace cover, and the argon flow of each path is gradually adjusted until the optimal slag overturning is observed. In a general control method, different fixed flow rates are set in different smelting periods, but the optimal slag overturning effect is difficult to achieve.
Disclosure of Invention
In order to solve the technical problems in the background art, the utility model provides a ladle refining furnace argon bottom blowing control device based on spectrum identification, which is used for controlling the surface light intensity of slag layer within a certain range by detecting the surface spectral luminous intensity of slag in an argon blowing area in an LF furnace in real time, adjusting the flow of an argon pipeline regulating valve and achieving the optimal slag tumbling effect, so that the optimal molten steel stirring effect is obtained with the lowest argon consumption.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a ladle refining furnace argon bottom blowing control device based on spectrum identification comprises a spectrum flame intensity detector B1, wherein the spectrum flame intensity detector B1 is fixedly installed on a manual observation hole on a water-cooled furnace cover of an LF furnace body, and the direction of a lens is aligned with an argon overturning area in the LF furnace, namely the middle area of a slag layer above molten steel above an argon pipeline inlet on the opposite side of an LF ladle sliding water gap;
the device also comprises an argon flow control regulating valve FV1 and an argon mass flow meter F1, wherein the argon flow control regulating valve FV1 and the argon mass flow meter F1 are both arranged on an argon pipeline at the bottom of the LF ladle;
the device also comprises a first PID regulator and a second PID regulator, wherein the spectrum flame intensity detector B1 is connected with the feedback signal input end of the first PID regulator, the output end of the first PID regulator is connected with the given signal input end of the second PID regulator, the argon gas mass flow meter F1 is connected with the feedback signal input end of the second PID regulator, and the output end of the second PID regulator is connected with the argon gas flow regulating valve FV 1.
Further, the first PID regulator and the second PID regulator adopt two independent PID regulating instruments.
Furthermore, the first PID regulator and the second PID regulator adopt a PLC and are realized by utilizing an internal PID module of the PLC.
Compared with the prior art, the utility model has the beneficial effects that:
according to the ladle refining furnace argon bottom blowing control device based on spectrum identification, disclosed by the utility model, the flow of the argon pipeline regulating valve is regulated by detecting the surface spectral luminous intensity of the slag in the argon blowing area in the LF furnace in real time, and the surface light intensity of the slag layer is controlled within a certain range, so that the molten steel is not exposed, the optimal slag overturning effect can be achieved, and the optimal molten steel stirring effect can be obtained with the lowest argon consumption.
Drawings
FIG. 1 is a diagram of the components of an argon bottom-blowing control device of a ladle refining furnace based on spectrum identification according to the present invention;
FIG. 2 is an overall structure diagram of an argon bottom blowing control device of a ladle refining furnace based on spectrum identification.
Wherein: 1-slag layer 2-molten steel 3 above an inlet, an LF furnace body 4, an argon pressure sensor P15, an argon mass flowmeter F16, an argon flow regulating valve FV 17, a spectral flame intensity detector B18, a water-cooled furnace cover 9, an LF ladle sliding gate 10, an argon pipeline 11, a first PID regulator 12 and a second PID regulator.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, the ladle refining furnace argon bottom blowing control device based on spectrum identification comprises a spectrum flame intensity detector B17, wherein the spectrum flame intensity detector B17 is fixedly installed on a manual observation hole on a water-cooled furnace cover 8 of an LF furnace body 3, and the direction of a lens is aligned to an argon gas turnover area in the LF furnace 3, namely the middle area of a slag layer 1 above molten steel above an inlet of an argon gas pipeline 10 on the opposite side of an LF ladle sliding water gap 9;
the device also comprises an argon flow regulating valve FV16 and an argon mass flow meter F15, wherein the argon flow regulating valve FV16 and the argon mass flow meter F15 are both arranged on an argon pipeline 10 at the bottom of the LF ladle;
as shown in fig. 2, the system further comprises a first PID controller 11 and a second PID controller 12, wherein the spectral flame intensity detector B17 is connected to a feedback signal input AI0 of the first PID controller 11, an output AO0 of the first PID controller 11 is connected to a predetermined signal input of the second PID controller 12, an argon gas mass flow meter F15 is connected to a feedback signal input AI1 of the second PID controller 12, and an output AO1 of the second PID controller 12 is connected to an argon gas flow regulating valve 85fv 15.
The first PID controller 11 and the second PID controller 12 can adopt two independent PID control instruments. A matched PID regulator is purchased in the market, and the input and the output of each loop are correspondingly connected. The first PID controller 11 and the second PID controller 12 can also adopt a PLC, and are implemented by using an internal PID module of the PLC, and the sensors and the regulating valve are all connected to the AI and AO ports of the PLC.
As shown in fig. 1, the device further comprises an argon pressure sensor P14, the argon pressure sensor P14 is installed on an argon pipeline 10 at the bottom of the LF ladle, and the argon pressure sensor P14 detects the pressure value of the argon pipeline 10 and is used for calibrating the flow value of the argon mass flowmeter F15 to be an actual flow value, and the calibration can be performed manually, or the argon pressure sensor P14 is connected to the input end of the PLC, and the calibration is automatically calculated inside the PLC.
The working principle of the utility model is as follows: the first PID regulator 11 is a main PID, the second PID regulator 12 is an auxiliary PID to form a cascade PID, an input signal fed back by the spectrum flame intensity detector B17 is actual light intensity, a given value of the main PID is given light intensity, the given light intensity is calibrated according to the best effect of the LF steel ladle slag layer, and the output of the main PID is argon given flow which is used as a given value of the auxiliary PID. The feedback input signal of the auxiliary PID is actual flow, which is obtained by detecting mass flow F15 in the argon pipeline, the main PID controls and outputs given flow, which is the set value of the auxiliary PID, and the output of the auxiliary PID is loaded to the argon flow regulating valve FV16 to ensure that proper argon flow is blown into molten steel from the bottom of the LF ladle. When the actual light intensity of the argon blowing area is lower than the given light intensity due to the reduction of the argon pressure, the given flow output by the main PID control is increased, namely the given flow of the auxiliary PID is increased, so that the actual flow is unchanged, the flow deviation is increased, the control output of the argon flow regulating valve FV16 is increased through the adjustment of the auxiliary PID, the regulating valve is opened, and the argon flow is increased. Obviously, the flow of argon is optimal, molten steel in an argon blowing area of a ladle of the LF furnace is enabled to tumble intensively, the molten steel is exposed out of a slag surface, the light intensity of the argon blowing area is increased, and the stable adjustment of the light intensity is realized. And vice versa. The control quality of the system is improved because the controlled light intensity can be prevented from being interfered by argon pressure fluctuation.
Before the system runs, the utility model needs to manually set the given light intensity, and the process is as follows: the argon flow regulating valve FV16 is adjusted manually, meanwhile, the surface of the LF layer is observed (through a camera), if steel bloom happens, the argon flow is adjusted in time, and the requirement that the visual inspection accords with the visual soft blowing effect is the best argon flow. Until the molten steel churning effect meets the requirement when the argon flow is adjusted, at the moment, the spectral fire detection arranged at the LF peephole marks the corresponding spectral intensity as the given light intensity.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (3)
1. The ladle refining furnace argon bottom blowing control device based on spectrum identification is characterized by comprising a spectrum flame intensity detector B1, wherein the spectrum flame intensity detector B1 is fixedly installed on a manual observation hole of a water-cooled furnace cover of an LF furnace body, and the direction of a lens is aligned to an argon gas overturning area in the LF furnace, namely the middle area of a slag layer above molten steel above an argon gas pipeline inlet on the opposite side of an LF ladle sliding water gap;
the device also comprises an argon flow regulating valve FV1 and an argon mass flow meter F1, wherein the argon flow regulating valve FV1 and the argon mass flow meter F1 are both arranged on an argon pipeline at the bottom of the LF ladle;
the device also comprises a first PID regulator and a second PID regulator, wherein the spectrum flame intensity detector B1 is connected with the feedback signal input end of the first PID regulator, the output end of the first PID regulator is connected with the given signal input end of the second PID regulator, the argon gas mass flow meter F1 is connected with the feedback signal input end of the second PID regulator, and the output end of the second PID regulator is connected with the argon gas flow regulating valve FV 1.
2. The argon bottom-blowing control device for the ladle refining furnace based on spectrum identification as claimed in claim 1, wherein the first PID regulator and the second PID regulator adopt two independent PID regulating instruments.
3. The ladle refining furnace argon bottom blowing control device based on spectrum identification as claimed in claim 1, wherein the first PID regulator and the second PID regulator adopt PLC, and are realized by utilizing an internal PID module of the PLC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121808536.8U CN215887123U (en) | 2021-08-04 | 2021-08-04 | Argon bottom blowing control device for ladle refining furnace based on spectrum identification |
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| CN202121808536.8U CN215887123U (en) | 2021-08-04 | 2021-08-04 | Argon bottom blowing control device for ladle refining furnace based on spectrum identification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232923A (en) * | 2022-07-27 | 2022-10-25 | 辽宁科技大学 | Method for refining molten steel by VD furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115232923A (en) * | 2022-07-27 | 2022-10-25 | 辽宁科技大学 | Method for refining molten steel by VD furnace |
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