CN103914627A - Method and system for measuring safe continuous casting liquid level of tundishes - Google Patents
Method and system for measuring safe continuous casting liquid level of tundishes Download PDFInfo
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- CN103914627A CN103914627A CN201410160068.6A CN201410160068A CN103914627A CN 103914627 A CN103914627 A CN 103914627A CN 201410160068 A CN201410160068 A CN 201410160068A CN 103914627 A CN103914627 A CN 103914627A
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Abstract
The invention relates to the technical field of metallurgy, and discloses a method and a system for measuring safe continuous casting liquid level of tundishes. The method comprises the following steps of simulating actual tundishes by using a tundish hydraulics model; setting test parameters of the tundish hydraulics model so as to simulate continuous casting operation of the actual tundishes; marking tail steel by using tracer agents and adding the tail steel in the tundish hydraulics model; monitoring the change conditions of electrical conductivity of liquid at an outlet of the tundish hydraulics model; recording the current liquid level of the liquid in the tundish hydraulics model when the changing conditions of the electrical conductivity of the liquid at the outlet of the tundish hydraulics model exceed a preset threshold value range; and determining the safe tundish continuous casting liquid level according to the current liquid level. A phenomenon that a large package of tail steel enters a crystallizer in actual production is effectively prevented, so that production requirements on clean steel are met.
Description
Technical field
The present invention relates to metallurgical technology field, be mainly applicable to tundish and connect assay method and the system of watering safe liquid level.
Background technology
Along with improving constantly that user requires steel product quality, smelt the emphasis that has become steel-making scientific and technical research containing inclusion size clean steel less, that be evenly distributed and steel performance is safe from harm.Continuous casting tundish is the transition container between ladle and crystallizer, has stabilized steel stream, promotes nonmetallic inclusionsin steel floating and realizes the effect of sequence casting.
Tundish connects that to water be that last tank molten steel has watered, and changes the process of direct casting after large tank, and tundish provides molten steel to crystallizer during this time.During even watering, the pulling rate of casting machine is constant, and tundish liquid level constantly reduces and enters tundish until a rear tank molten steel is opened to water.Tundish connects and waters safe liquid level, refers to before a rear tank molten steel is opened and watered, and can companys of guarantee waters operation and carries out smoothly watering minimum liquid level with the tundish company of slab quality.
At present, about tundish, even watering safe liquid level there is no unified decision method.Aborning, in order to ensure slab quality, conventionally there are following two kinds of methods of operating:
(1) produce liquid level higher than tundish " eddy current "." eddy current " produces liquid level and can be tested and be recorded by hydraulic model.In routine is produced, realize sequence casting, need only and ensure that tundish even waters safe liquid level and is not less than " eddy current " generation liquid level (tundish that slag volume does not occur even waters minimum liquid level).
(2) tundish connects that to water safe liquid level more high better.Water in process in company, last stove molten steel has watered while closing slide plate, wraps greatly top slag and can enter tundish along with the molten steel (wrapping greatly tail steel) of large bag last stage.Because the oxidisability of top slag is very strong, therefore large bag tail steel secondary oxidation is serious, and inclusion content is high.In order to prevent that wrapping greatly tail steel flows into crystallizer, and ensure that the snotter in tail steel can have sufficient time floating to get rid of, and according to produced on-site requirement, connects tundish to water the more high better of safe liquid level control, concrete safe liquid level Main Basis workman experience is set, and there is no unified standard.
There is following problem in existing method:
First, before connecting the rear one heat steel water that waters process and not opening and water, along with the continuous reduction of tundish liquid level, the time that molten steel stops in tundish shortens gradually, even in the situation that not producing " eddy current ", also can flow to into crystallizer with steel containing the more large bag tail steel of snotter, the method obviously cannot meet the production requirement of clean steel.
Secondly,, owing to watering the control of safe liquid level to connecting and lack the judgment basis of science, therefore not necessarily can meet the requirement that prevents wrapping greatly tail steel and enter crystallizer, accuracy is not high.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of tundish and connects assay method and the system of watering safe liquid level, and it can effectively prevent that tail steel from entering crystallizer, thereby meets the production requirement of clean steel.
For solving the problems of the technologies described above, the invention provides a kind of tundish and connect the assay method that waters safe liquid level, comprising:
Simulate actual tundish with tundish hydraulic model;
Set the test parameters of described tundish hydraulic model, water operation with the company of simulating described actual tundish;
Identify tail steel with tracer agent and add described tundish hydraulic model;
Monitor the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model;
In the time monitoring the situation of change of conductivity of liquid in exit of described tundish hydraulic model and exceed predetermined threshold range, record the current liquid level of liquid in tundish hydraulic model, determine according to described current liquid level that tundish connects and water safe liquid level.
Further, described tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Described entrance slide plate is arranged on the top of described model ontology; Described outlet valve is arranged on the bottom of described model ontology;
Described test parameters comprises: initial liquid level, model inlet flow rate and model rate of discharge;
The test parameters of the described tundish hydraulic model of described setting, water operation and comprise to simulate the company of described actual tundish: set the opening degree of the initial liquid level of described model ontology, described entrance slide plate and described outlet valve, water operation with the company of simulating described actual tundish.
Further, the situation of change of the conductivity of the liquid in the exit of described monitoring tundish hydraulic model comprises: the conductivity of monitoring the liquid in the exit of described tundish hydraulic model by monitored conductivity element, the conductivity monitoring is transferred to processor by described monitored conductivity element, and described processor is determined the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model according to the conductivity receiving.
Further, described monitored conductivity element comprises: conductance instrument or conductivity sensor.
Further, described in the time monitoring the situation of change of conductivity of liquid in exit of tundish hydraulic model and exceed predetermined threshold range, the current liquid level that records liquid in tundish hydraulic model comprises: in the time that described processor determines that the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model exceeds predetermined threshold range, record the liquid level of liquid in described tundish hydraulic model based on level monitoring element.
Further, described level monitoring element comprises: liquid level sensor or scale;
In the time that described level monitoring element is liquid level sensor, the described liquid level that records liquid in described tundish hydraulic model based on level monitoring element comprises: described processor sends liquid level to described liquid level sensor and gathers switching signal, described liquid level sensor receives described liquid level collection switching signal and carries out liquid level collection, and the liquid level data collecting is transferred to described processor, described processor is according to the liquid level of liquid in tundish hydraulic model described in the liquid level data recording receiving;
In the time that described level monitoring element is scale, the described liquid level that records liquid in described tundish hydraulic model based on level monitoring element comprises: described processor is exported the information of checking scale, so that by the liquid level of liquid in tundish hydraulic model described in the described scale data recording of observation.
Further, describedly determine according to described current liquid level that tundish connects and water safe liquid level and comprise: according to the proportionate relationship of described tundish hydraulic model and actual tundish, will described current liquid level conversion obtain actual tundish company and water safe liquid level.
Further, described tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.
The present invention also provides a kind of tundish to connect the mensuration system of watering safe liquid level, comprising: comprising: tundish hydraulic model, monitored conductivity element, level monitoring element, tracer agent and processor; Described tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Described entrance slide plate is arranged on the top of described model ontology; Described outlet valve is arranged on the bottom of described model ontology; Described monitored conductivity element is arranged on the bottom of described model ontology; Described level monitoring element is arranged on described model ontology; Be added in described model ontology for the described tracer agent that identifies tail steel; Described monitored conductivity element is connected with described processor signal; Described monitored conductivity element gathers the conductivity Information Monitoring of the liquid in the exit of described tundish hydraulic model, and described conductivity Information Monitoring is offered to described processor; Described processor is monitored the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model according to the conductivity Information Monitoring receiving; When the situation of change that monitors the conductivity of the liquid in the exit of described tundish hydraulic model when described processor exceeds predetermined threshold range, record the current liquid level of liquid in described tundish hydraulic model based on described level monitoring element.
Further, described monitored conductivity element comprises: conductance instrument or conductivity sensor; Described level monitoring element comprises: liquid level sensor or scale; Described liquid level sensor is connected with described processor signal; Described tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.
Beneficial effect of the present invention is:
Tundish provided by the invention connects assay method and the system of watering safe liquid level, first simulates actual tundish with tundish hydraulic model, and sets test parameters; Add tundish hydraulic model with the large bag of tracer agent mark tail steel again, and the situation of change of the conductivity of the liquid in exit by monitoring tundish hydraulic model judges the whether outlet of arrival mode of tracer agent, whether large bag tail steel arrives the outlet of actual tundish, thereby determine that tundish even waters safe liquid level, effectively prevent that the large bag tail steel in actual production from entering crystallizer, thereby met the production requirement of clean steel.
Brief description of the drawings
The tundish that Fig. 1 provides for the embodiment of the present invention connects the process flow diagram of the assay method that waters safe liquid level.
Embodiment
For further setting forth technological means and effect that the present invention takes for reaching predetermined goal of the invention, below in conjunction with accompanying drawing and preferred embodiment, the tundish proposing is even watered to the assay method of safe liquid level and the embodiment of system and principle of work be elaborated according to the present invention.
Referring to Fig. 1, the tundish that the embodiment of the present invention provides connects the assay method that waters safe liquid level, comprising:
Step S110: simulate actual tundish with tundish hydraulic model; In the present embodiment, tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Entrance slide plate is arranged on the top of model ontology; Outlet valve is arranged on the bottom of model ontology.
Step S120: set the test parameters of tundish hydraulic model, water operation with the company of simulating actual tundish; Wherein, test parameters comprises: model inlet flow rate, model rate of discharge and initial liquid level; In the present embodiment, this step specifically comprises: the opening degree of initial liquid level, entrance slide plate and the outlet valve of setting model body, waters operation with the company of simulating actual tundish.
Step S130: wrap greatly tail steel by tracer agent mark and add tundish hydraulic model; Wherein, tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.It should be noted that, the proportioning of potassium chloride, methyl blue biological stain and distilled water is determined by real needs.
Step S140: close the entrance of tundish hydraulic model, control the opening degree of the outlet valve of tundish hydraulic model, keep the flow of liquid in tundish hydraulic model exit constant, simulate in casting cycle the pulling rate of casting machine constant.Here it should be noted that, also can control the opening degree of tundish hydraulic model outlet valve in real time according to other actual demands.
Step S150: the situation of change of the conductivity of the liquid in the exit of monitoring tundish hydraulic model; In the present embodiment, can monitor by monitored conductivity components and parts the conductivity of the liquid in the exit of tundish hydraulic model, the conductivity monitoring is transferred to processor by monitored conductivity components and parts, the situation of change of processor is determined the exit of the tundish hydraulic model conductivity of liquid according to the conductivity that receives within one period of schedule time; The schedule time is determined by actual test demand.Wherein, monitored conductivity components and parts comprise: conductance instrument, conductivity sensor etc.
In the time monitoring the situation of change of conductivity of liquid in exit of tundish hydraulic model and exceed predetermined threshold range, illustrate that tracer agent just in time flow to the exit of tundish hydraulic model, large bag tail steel just in time flow to the exit of actual tundish, record the current liquid level of liquid in tundish hydraulic model, determine that according to current liquid level tundish even waters safe liquid level.Wherein, predetermined threshold range is determined by actual test demand.This step specifically comprises: in the time that processor determines that the situation of change in the given time of conductivity of the liquid in the exit of tundish hydraulic model exceeds predetermined threshold range, record the liquid level of liquid in tundish hydraulic model based on level monitoring element.Wherein, level monitoring element comprises: liquid level sensor, scale etc.
In the time that level monitoring element is liquid level sensor, record the liquid level of liquid in tundish hydraulic model based on level monitoring element, specifically comprise: processor sends liquid level to liquid level sensor and gathers switching signal; Liquid level sensor receives liquid level collection switching signal and carries out liquid level collection, and the liquid level data collecting is transferred to processor, and processor is according to the liquid level of liquid in the liquid level data recording tundish hydraulic model receiving;
In the time that level monitoring element is scale, record the liquid level of liquid in tundish hydraulic model based on level monitoring element, specifically comprise: processor is exported the information of checking scale, so that by the liquid level of liquid in artificial observation scale data recording tundish hydraulic model.
In addition, determine that according to current liquid level tundish connects the concrete steps of watering safe liquid level and comprises: according to the proportionate relationship of tundish hydraulic model and actual tundish, current liquid level is converted and obtains actual tundish company and water safe liquid level.Wherein, when tundish hydraulic model and actual tundish are time in full accord, the current liquid level of record is exactly that actual tundish connects and waters safe liquid level.
In the time monitoring the situation of change of conductivity of liquid in exit of tundish hydraulic model and not exceeding predetermined threshold range, illustrate that tracer agent does not also flow to the exit of tundish hydraulic model, large bag tail steel does not also flow to the exit of actual tundish, wait for the exit of flow of tracer to tundish hydraulic model, prepare record data.
The tundish that the embodiment of the present invention provides connects the mensuration system of watering safe liquid level, comprising: tundish hydraulic model, monitored conductivity element, level monitoring element, tracer agent and processor; Tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Entrance slide plate is arranged on the top of model ontology; Outlet valve is arranged on the bottom of model ontology; Monitored conductivity element is arranged on the outlet at bottom place of model ontology; Level monitoring element is arranged on model ontology; Be added in model ontology for the tracer agent that identifies tail steel; Monitored conductivity element is connected with processor signal.Monitored conductivity element gathers the conductivity Information Monitoring of the liquid in the exit of tundish hydraulic model, and conductivity Information Monitoring is offered to processor; Processor is according to the situation of change of the conductivity of the liquid in the exit of the conductivity Information Monitoring monitoring tundish hydraulic model receiving; When the situation of change that monitors the conductivity of the liquid in the exit of tundish hydraulic model when processor exceeds predetermined threshold range, record the current liquid level of liquid in tundish hydraulic model based on level monitoring element.Wherein, monitored conductivity element, comprising: conductance instrument, conductivity sensor etc.; Level monitoring element comprises: liquid level sensor, scale etc.In the time that level monitoring element is liquid level sensor, liquid level sensor is connected with processor signal; Tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.It should be noted that, the proportioning of potassium chloride, methyl blue biological stain and distilled water is determined by real needs.
Measure continuous casting tundish by the embodiment of the present invention and even water safe liquid level, first make according to the inner cavity size of on-the-spot tundish the tundish hydraulic model that material is organic glass, and determine the parameter such as model flow, initial liquid level according to actual conditions.Add in organic glass model with the tail steel that the large bag of tracer agent mark is cast latter stage again, and close closed model entrance slide plate, control the opening degree of model outlet valve.Then the conductivity of the liquid in monitoring model exit, determines that tundish even waters safe liquid level.
It should be noted that, in the present embodiment, can also verify the measurement result of the embodiment of the present invention by the method for numerical simulation calculation, concrete method is as follows:
In the hydraulics test of the present embodiment, the outflow situation of the liquid in the exit of monitoring tundish hydraulic model, draws out the RTD curve that in model, the tracer agent residence time distributes.Draw the short residence time T of tracer agent in model according to RTD curve
minwith corresponding liquid level L
min.
In addition, also set up the 3D mathematical model of equal proportion according to the inner cavity size of on-the-spot tundish, then 3D mathematical model is carried out to grid division, determine computational fields, import and export the boundary conditions such as flow, heat transfer coefficient, viscosity, carry out analog computation.Calculate after convergence, introduce tracer agent diffusion equation, simulation adds tracer agent mobile calculating in tundish, the outlet of monitoring model simultaneously.Along with the reduction gradually of computational fields liquid level, in the time tracer agent being detected in model exit, stop calculating, feed back now 3D mathematical model liquid level L,
min, and recording process time T,
min.
The result of hydraulics physical test and numerical simulation calculation is compared, can be to L
minverify.Here it should be noted that, because the setting of boundary condition may exist error, therefore the possibility of result of numerical simulation calculation is inaccurate, and can only be used for reference.
The tundish that the embodiment of the present invention provides connects assay method and the system of watering safe liquid level, first simulates actual tundish with tundish hydraulic model, and sets test parameters; Add tundish hydraulic model with the large bag of tracer agent mark tail steel again, and the situation of change of the conductivity of the liquid in exit by monitoring tundish hydraulic model judges the whether outlet of arrival mode of tracer agent, whether large bag tail steel arrives the outlet of actual tundish, thereby determine that tundish even waters safe liquid level, effectively prevent that the large bag tail steel in actual production from entering crystallizer, thereby met the production requirement of clean steel.The embodiment of the present invention is carried out tundish and is connected the mensuration of watering safe liquid level taking hydraulics physical test as technological means, in ensureing the cleanliness factor of clean steel, also avoid aborning the company of emphasizing simply to water the high liquid level of tundish, high and the produced on-site of operation easier is watered and organizes the generation of the situation that difficulty is high by the company that has effectively avoided causing because technological standards is superfluous, has ensured normally carrying out of production.Embodiment of the present invention accuracy is high, workable, effect is remarkable.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. tundish connects an assay method that waters safe liquid level, it is characterized in that, comprising:
Simulate actual tundish with tundish hydraulic model;
Set the test parameters of described tundish hydraulic model, water operation with the company of simulating described actual tundish;
Identify tail steel with tracer agent and add described tundish hydraulic model;
Monitor the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model;
In the time monitoring the situation of change of conductivity of liquid in exit of described tundish hydraulic model and exceed predetermined threshold range, record the current liquid level of liquid in tundish hydraulic model, determine according to described current liquid level that tundish connects and water safe liquid level.
2. tundish as claimed in claim 1 connects the assay method that waters safe liquid level, it is characterized in that, described tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Described entrance slide plate is arranged on the top of described model ontology; Described outlet valve is arranged on the bottom of described model ontology;
Described test parameters comprises: initial liquid level, model inlet flow rate and model rate of discharge;
The test parameters of the described tundish hydraulic model of described setting, water operation and comprise to simulate the company of described actual tundish: set the opening degree of the initial liquid level of described model ontology, described entrance slide plate and described outlet valve, water operation with the company of simulating described actual tundish.
3. tundish as claimed in claim 1 connects the assay method that waters safe liquid level, it is characterized in that, the situation of change of the conductivity of the liquid in the exit of described monitoring tundish hydraulic model comprises: the conductivity of monitoring the liquid in the exit of described tundish hydraulic model by monitored conductivity element, the conductivity monitoring is transferred to processor by described monitored conductivity element, and described processor is determined the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model according to the conductivity receiving.
4. tundish as claimed in claim 3 connects the assay method that waters safe liquid level, it is characterized in that, described monitored conductivity element comprises: conductance instrument or conductivity sensor.
5. tundish as claimed in claim 3 connects the assay method that waters safe liquid level, it is characterized in that, described in the time monitoring the situation of change of conductivity of liquid in exit of tundish hydraulic model and exceed predetermined threshold range, the current liquid level that records liquid in tundish hydraulic model comprises: in the time that described processor determines that the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model exceeds predetermined threshold range, record the liquid level of liquid in described tundish hydraulic model based on level monitoring element.
6. tundish as claimed in claim 5 connects the assay method that waters safe liquid level, it is characterized in that, described level monitoring element comprises: liquid level sensor or scale;
In the time that described level monitoring element is liquid level sensor, the described liquid level that records liquid in described tundish hydraulic model based on level monitoring element comprises: described processor sends liquid level to described liquid level sensor and gathers switching signal, described liquid level sensor receives described liquid level collection switching signal and carries out liquid level collection, and the liquid level data collecting is transferred to described processor, described processor is according to the liquid level of liquid in tundish hydraulic model described in the liquid level data recording receiving;
In the time that described level monitoring element is scale, the described liquid level that records liquid in described tundish hydraulic model based on level monitoring element comprises: described processor is exported the information of checking scale, so that by the liquid level of liquid in tundish hydraulic model described in the described scale data recording of observation.
7. the tundish as described in any one in claim 1-6 connects the assay method that waters safe liquid level, it is characterized in that, describedly determine according to described current liquid level that tundish connects and water safe liquid level and comprise: according to the proportionate relationship of described tundish hydraulic model and actual tundish, will described current liquid level conversion obtain actual tundish company and water safe liquid level.
8. the tundish as described in any one in claim 1-6 connects the assay method that waters safe liquid level, it is characterized in that, described tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.
9. tundish connects a mensuration system of watering safe liquid level, it is characterized in that, comprising: tundish hydraulic model, monitored conductivity element, level monitoring element, tracer agent and processor; Described tundish hydraulic model comprises: model ontology, entrance slide plate and outlet valve; Described entrance slide plate is arranged on the top of described model ontology; Described outlet valve is arranged on the bottom of described model ontology; Described monitored conductivity element is arranged on the bottom of described model ontology; Described level monitoring element is arranged on described model ontology; Be added in described model ontology for the described tracer agent that identifies tail steel; Described monitored conductivity element is connected with described processor signal; Described monitored conductivity element gathers the conductivity Information Monitoring of the liquid in the exit of described tundish hydraulic model, and described conductivity Information Monitoring is offered to described processor; Described processor is monitored the situation of change of the conductivity of the liquid in the exit of described tundish hydraulic model according to the conductivity Information Monitoring receiving; When the situation of change that monitors the conductivity of the liquid in the exit of described tundish hydraulic model when described processor exceeds predetermined threshold range, record the current liquid level of liquid in described tundish hydraulic model based on described level monitoring element.
10. tundish as claimed in claim 9 connects the mensuration system of watering safe liquid level, it is characterized in that, described monitored conductivity element comprises: conductance instrument or conductivity sensor; Described level monitoring element comprises: liquid level sensor or scale; Described liquid level sensor is connected with described processor signal; Described tracer agent comprises: potassium chloride, methyl blue biological stain and distilled water.
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