CN113649539A - Judging device for continuous casting secondary cooling water nozzle state - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention provides a device for judging the state of a continuous casting secondary cooling water nozzle, which comprises: the cooling system comprises a cooling circuit, a pressure gauge P1 arranged on the cooling circuit, a flow meter F1 arranged on the cooling circuit, a regulating valve arranged on the cooling circuit, a computer and a display connected with the computer, wherein the computer is connected with the pressure gauge P1 and the flow meter F1 through data lines or wireless transmission signals. The method can improve the accuracy of the judgment result, does not need to additionally increase hardware, and is simple, low in cost and convenient to maintain.
Description
The invention is a divisional application, and the mother case is as follows: application No.: 2020101575035, filing date: 3, 9 days in 2020, the invention name is: a method and a device for judging the state of a continuous casting secondary cooling water nozzle.
Technical Field
The invention relates to the field of continuous casting in the metallurgical industry, in particular to a device for judging the state of a continuous casting secondary cooling water nozzle.
Background
Continuous casting is a process of condensing molten steel into solid steel billets by liquid cooling, wherein the cooling is realized by cooling a crystallizer and secondarily cooling spray water, and whether the secondary cooling of the spray water is uniform or not directly influences the surface and internal quality of casting billets so as to influence the final quality of products.
The spray water is sprayed out to the surface of the steel billet through the cooling loop pipeline by the nozzle to play a role in cooling, when the nozzle is blocked, the temperature of the surface of the casting blank is uneven, and the local temperature is too high or too low, so that cracks are formed on the surface or inside of the casting blank. Especially for peritectic steel, boron-containing steel and other crack sensitive steel types, if the normal work of the nozzle can not be ensured, the incidence rate of longitudinal cracks and angular transverse cracks is greatly improved.
At present, most steel mills detect the blockage of the nozzle by manual detection, namely, the spray condition of the nozzle is checked by naked eyes after the continuous casting is stopped or in the production process to judge whether the nozzle is blocked or not. Because most of the nozzle positions in the fan-shaped section are in a narrow space, and some nozzles in some areas, such as nozzles in a bent section, are difficult to clearly observe, the mode not only needs to consume a large amount of time and manpower, but also can not ensure that all the nozzles are effectively detected.
Star, etc. (junk, etc., a movable continuous casting secondary cooling area cooling medium dynamic pressure measuring instrument, patent No. 201320727495.9) discloses a device comprising an external frame, pressure sensor units, a sensor unit integration rod and a sensor signal integrator, wherein a support frame is arranged inside the external frame, the sensor unit integration rod is fixed on the external frame and the support frame, the sensor unit integration rod is fixed with the pressure sensor units which are arranged linearly, and the pressure sensor units are connected with the sensor signal integrator through signal lines. However, the application has the following disadvantages: the distance between the sensors is a fixed value, the relative positions of the sensors and the secondary cooling area nozzles cannot be accurately controlled in the test process, and the test result is easy to deviate; and the instrument is large in size, and the connection of the sensor lead is complicated, so that the maintenance and overhaul of the instrument are not facilitated.
In addition, there are other methods for detecting clogging of the nozzle in the second cooling stage of continuous casting, but the conventional methods are difficult to implement or inaccurate in detection.
In summary, the following problems exist in the prior art: the existing continuous casting secondary cooling section nozzle blockage detection is inaccurate.
Disclosure of Invention
The invention provides a method and a device for judging the state of a continuous casting secondary cooling water nozzle, which aim to solve the problem of inaccurate detection of the blockage of the existing continuous casting secondary cooling section nozzle.
Therefore, the invention provides a method for judging the state of a continuous casting secondary cooling water nozzle, which comprises the following steps:
measuring relevant parameter data of the spraying cooling medium on line; wherein for the water nozzle, spray water pressure and spray water flow are included; for the gas-water nozzle, the spraying water pressure, the spraying water flow and the compressed air pressure are included;
considering the influence of the cooling loop pipeline route on the pressure of the spray water, constructing a theoretical pressure model of the spray water;
in the continuous casting production process, relevant parameter data of the cooling medium of each loop, including actual spray water pressure, are obtained in real time;
calculating the theoretical spraying water pressure of the loop according to the relevant parameter data of the loop and by combining the constructed theoretical spraying water pressure model;
judging the instantaneous working state of the loop according to the theoretical spraying water pressure and the actual spraying water pressure of the loop;
and counting the frequency of each instantaneous working state in each time period to further obtain the state of the cooling circuit.
Further, for cooling circuits where the nozzles are water nozzles, the spray water pressure model: ptw＝kwQw 2+Pl，PtwThe principle ofTheoretical pressure, in MPa, kwCoefficient of the spray water flow in Mpa (L/min)-2，Qw-the flow rate of the spray water of said circuit, in units of: l/min Pl-the pressure drop of the circuit caused by the routing of the pipes, in MPa.
Further, for a cooling loop with a nozzle being an air-water nozzle, the spray water pressure model: ptw＝kwQw 2+kaPa+Pl，PtwIs the theoretical pressure in MPa, kwCoefficient of the spray water flow in Mpa (L/min)-2，Qw-the flow rate of the spray water of said circuit, in units of: l/min, ka-compressed air pressure term coefficient, dimensionless, P of the cooling circuita-compressed air pressure of said circuit, in MPa, Pl-the pressure drop of the circuit caused by the routing of the pipes, in MPa.
Further, determining the instantaneous working state of the loop according to the theoretical spray water pressure and the actual spray water pressure of the loop comprises:
presetting 4 thresholds theta 1, theta 2, theta 3 and theta 4, wherein theta 1> theta 2> theta 3> theta 4;
presetting 5 instantaneous working states, namely a state 1-a blocking state, a state 2-a slight blocking state, a state 3-a normal state, a state 4-a slight leakage state and a state 5-a leakage state;
the theoretical spray water pressure and the actual spray water pressure deviation ratio sigma are calculated as follows
σ＝(Paw－Ptw)/Ptw
If sigma is larger than theta 1, the instantaneous working state of the loop is state 1;
if theta 2< sigma is less than or equal to theta 1, the instantaneous working state of the loop is in a state 2;
if theta 3< sigma is less than or equal to theta 2, judging that the instantaneous working state of the loop is in a state 3;
if theta 4< sigma is less than or equal to theta 3, the instantaneous working state of the loop is judged to be a state 4;
if sigma is less than or equal to theta 4, the instantaneous working state of the loop is judged to be a state 5.
Further, counting the frequency of each instantaneous operating state in each time period to obtain the state of the cooling circuit includes:
the preset frequency deviation rate threshold value C0 is set to be between 0 and 1 in value C0.
Counting the frequency of 5 state frequencies in a time period, and sequentially arranging the frequency frequencies from more to less, wherein the frequency frequencies are respectively C1～C5(ii) a Get C1And C2The two values, which are compared,
if (C1-C2)/C1 > C0, the state with the most frequent occurrence is the current state, and otherwise, the state is the normal state.
The invention also provides a device for judging the state of the continuous casting secondary cooling water nozzle, which comprises: the device comprises a cooling loop, a pressure gauge P1 arranged on the cooling loop, a flow meter F1 arranged on the cooling loop, a regulating valve arranged on the cooling loop, a computer and a display connected with the computer, wherein the computer is connected with the pressure gauge P1 and the flow meter F1 through data lines or wireless transmission signals, and the continuous casting secondary cooling water nozzle state judging device adopts the continuous casting secondary cooling water nozzle state judging method to judge the state of the continuous casting secondary cooling water nozzle.
The invention not only considers the influence of the on-site pipeline route of the spraying system of the continuous casting machine on the pressure drop of spraying water, can improve the accuracy of the judgment result, for example, compared with the observation by naked eyes, the accuracy rate can reach more than 90 percent, and the invention does not need to additionally increase hardware, has simple method, low cost and convenient maintenance.
Drawings
FIG. 1 is a schematic view of the cooling principle of the continuous casting process of the present invention;
FIG. 2 is a schematic view of a continuous casting spray water circuit of the present invention;
FIG. 3 is a schematic structural view of a device for judging the state of a secondary cooling water nozzle for continuous casting according to the present invention.
Reference numerals: p1 is a pressure gauge, F1 is a flowmeter.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1, continuous casting is a process of condensing molten steel from a liquid state to a solid state steel billet, and cooling is realized by cooling a crystallizer and secondarily cooling spray water. The spray water is sprayed out from the nozzles to the surface of the steel billet through the cooling loop pipeline (i.e. the spray loop) to perform a cooling function, and as shown in fig. 2, the spray water secondary cooling area is provided with a plurality of cooling loops (i.e. the spray loops).
The invention establishes a set of new spray water pressure model, and the model considers the influence of the cooling loop pipeline route on the spray water pressure, thereby improving the efficiency and the accuracy of the detection of the working state of the nozzle in the secondary cooling area of continuous casting.
The working principle of the invention is as follows: judging the instantaneous working state of the nozzle by comparing the theoretically calculated spraying water pressure with the actual spraying water pressure, counting the frequency of each instantaneous working state in a certain period to obtain two working states with the most frequency, wherein when the ratio difference of the two working states is large, the working state with the most frequency is obtained, and otherwise, the working state is the normal state.
The specific implementation process of the invention is as follows:
cleaning all online nozzles of the continuous casting machine or replacing the online nozzles with new nozzles;
testing relevant parameters of each loop of the continuous casting secondary cooling system in a full range on line, and recording, wherein part of data is shown in a table 1;
relevant parameters of the cooling medium for the cooling circuit of the water nozzle comprise spray water pressure and spray water flow; the cooling loop for the gas-water nozzle comprises spraying water pressure, spraying water flow and compressed air pressure;
considering the influence of the cooling loop pipeline routing on the pressure of the spray water, a theoretical pressure model of the spray water is constructed, taking a gas-water nozzle as an example, and the theoretical pressure model comprises the following steps:
the spray water pressure model is as follows:
Ptw＝kwQw 2+kaPa+Pl
solving the correlation coefficient of the spray water pressure model by using data of the line pair continuous casting secondary cooling system each loop related parameter test; obtaining kw, ka, Pl, (using a multiple linear regression algorithm), e.g. by finding k for a loop using the method described abovew＝5.5×10-6In units of Mpa (L/min)-2，ka0.67, dimensionless, Pl-0.013 units is MPa;
furthermore, in the continuous casting production process, relevant parameter data of the cooling medium of each loop are obtained in real time, and for a water nozzle, the relevant parameter data comprise spraying water pressure and spraying water flow; for the gas-water nozzle, the relevant parameter data includes the pressure of the spray water, the flow rate of the spray water and the pressure of the compressed air, and the gas-water nozzle is taken as an example, and part of the data is shown in table 1:
the frequency of the acquired data is H0.1 hz, namely the data is measured every 10 seconds, so that the frequency is reasonable;
further, according to the relevant parameter data of the loop and by combining the constructed theoretical spray water pressure model, for the gas-water nozzle, the theoretical spray water pressure calculation model is as follows, and the calculated P istwAs shown in table 1.
Ptw＝kwQaw 2+kaPaa+Pl
Further, determining the instantaneous working state of the loop according to the theoretical spray water pressure and the actual spray water pressure of the loop comprises:
presetting 4 threshold values theta 1, theta 2, theta 3 and theta 4; for example, empirically and specifically cooling back takes the following values: θ 1 ═ 0.15, θ 2 ═ 0.1, θ 3 ═ 0.1, θ 4 ═ 0.15; presetting 5 instantaneous working states, namely a state 1-a blocking state, a state 2-a slight blocking state, a state 3-a normal state, a state 4-a slight leakage state and a state 5-a leakage state;
calculating theoretical pressure and actual pressure deviation ratio sigma, sigma ═ Paw－Ptw)/Ptw
The partial calculation results and the operating states are shown in table 1.
Taking the first sample data in table 1 as an example, σ is-0.246 < θ 4, so its instantaneous state is leakage.
Further, counting the frequency of each instantaneous operating state within each time period, and obtaining the state of the nozzle includes:
the preset frequency deviation rate threshold value C0 is 0.3;
counting the frequency of 5 states within 5 minutes of a time period, wherein the time period is 5 minutes, the 5 states are relatively comprehensive in performance and relatively sufficient in frequency, and are arranged from most to least and are respectively C1-C5;
the frequency of leakage states C1 is 20, the frequency of light leakage states C2 is 5, the frequency of normal states C3 is 2, the frequency of light blockage states C4 is 1, and the frequency of blockage states C5 is 2;
since (20-5)/20 >0.3, the state leakage state that occurs most frequently is the current state. Specific data of the present invention are shown in Table 1.
TABLE 1
The method for judging the state of the continuous casting secondary cooling water nozzle can automatically acquire data and analyze and judge through the continuous casting secondary cooling water nozzle state judging device shown in figure 3. As shown in fig. 3, the present invention also provides a continuous casting secondary cooling water nozzle state determination apparatus, comprising: a cooling loop, a pressure gauge P1 arranged on the cooling loop, a flowmeter F1 arranged on the cooling loop, a regulating valve (used for regulating the flow of the cooling loop) arranged on the cooling loop, a computer and a display connected with the computer, wherein, the computer is connected with the pressure gauge P1 and the flowmeter F1 through data lines or wireless transmission signals, the computer obtains the signals sent by the pressure gauge P1 and the flowmeter F1, according to the above judging method of the continuous casting secondary cooling water nozzle state, a set of new spraying water pressure model is established, considering the influence of the pipeline route of the cooling loop on the spraying water pressure, the instantaneous working state of the nozzle is judged through the comparison of the theoretically calculated spraying water pressure and the actual spraying water pressure, the frequency of each instantaneous working state is counted in a certain period, two working states with the maximum frequency are obtained, when the proportion of the two working states is large, the working state with the most frequency is obtained, otherwise, the working state is the normal state. Above-mentioned device has realized the automatic judgement of continuous casting secondary cooling water nozzle state, and the automatic collection and the analysis and processing of data have improved the judgement efficiency of cooling water nozzle state, for example compare with the visual observation, and the rate of accuracy can reach more than 90%.
Further, the apparatus for determining the state of the continuous casting secondary cooling water nozzle according to the present invention may further include: the data collector collects signals of the pressure gauge P1 and the flowmeter F1 and sends the collected signals to the computer, the data collector is connected between the computer and the pressure gauge P1 and between the computer and the flowmeter F1, wherein the pressure gauge P1 and the flowmeter F1 are both digital, so that digital signals can be sent out, and the data collector or the computer can collect or analyze the signals conveniently. The receipt can be better collected by using the data acquisition unit, and the computer processing is convenient.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (5)
1. A continuous casting secondary cooling water nozzle state judging device is characterized by comprising: the device comprises a cooling circuit, a pressure gauge P1 arranged on the cooling circuit, a flow meter F1 arranged on the cooling circuit, a regulating valve arranged on the cooling circuit, a computer arranged outside the cooling circuit and a display connected with the computer, wherein the computer is connected with the pressure gauge P1 and the flow meter F1 through data lines or wireless transmission signals, and the judging device for the state of the continuous casting secondary cooling water nozzle judges the state of the continuous casting secondary cooling water nozzle by adopting a judging method for the state of the continuous casting secondary cooling water nozzle.
The method for judging the state of the continuous casting secondary cooling water nozzle comprises the following steps:
step A: measuring relevant parameter data of the spraying cooling medium on line; for a cooling loop with a gas-water nozzle as a nozzle, the actual spray water pressure P is acquired on line in real timeawAnd actual spray water flow rate QawAnd the actual compressed air pressure PaaAcquiring a data frequency H;
and B: considering the influence of the cooling loop pipeline route on the pressure of the spray water, constructing a theoretical pressure model of the spray water; for cooling loops with nozzles that are air-water nozzles, the spray water pressure model: ptw＝kwQw 2+kaPa+Pl，PtwIs the theoretical pressure in MPa, kwCoefficient of spray water flow in Mpa L-2/min-2，Qw-the flow rate of the spray water of said circuit, in units of: l/min, ka-compressed air pressure term coefficient, dimensionless, P of the cooling circuita-compressed air pressure of said circuit, in MPa, Pl-the pressure drop of the circuit caused by the routing of the circuit, in MPa;
solving the correlation coefficient of the spray water pressure model by using data of the line pair continuous casting secondary cooling system each loop related parameter test; applying a multiple linear regression algorithm to obtain kw, ka and Pl;
and C: in the continuous casting production process, the actual spray water pressure of the cooling medium of each loop is obtained in real time;
step D: calculating the theoretical spraying water pressure of the loop according to the relevant parameter data of the loop obtained in the step A and by combining the theoretical spraying water pressure model constructed in the step B;
step E: c, judging the instantaneous working state of the loop according to the theoretical spraying water pressure of the loop and the actual spraying water pressure by the actual spraying water pressure obtained in the step C;
step F: counting the frequency of each instantaneous working state in each time period to obtain the state of the cooling loop;
counting the frequency of each instantaneous working state in each time period to obtain the state of the cooling circuit, wherein the state comprises the following steps:
presetting frequency deviation rate threshold C0，C0The value is between 0 and 1;
counting the frequency of 5 state frequencies in a time period, and sequentially arranging the frequency frequencies from more to less, wherein the frequency frequencies are respectively C1～C5(ii) a Get C1And C2The two values, which are compared,
if (C)1－C2)/C1>C0If the state with the most frequency is the current state, otherwise, the state is the normal state.
2. The apparatus for judging the state of a continuous casting secondary cooling water nozzle as set forth in claim 1, wherein the apparatus for judging the state of a continuous casting secondary cooling water nozzle further comprises: and the data collector collects signals of the pressure gauge P1 and the flowmeter F1 and sends the collected signals to the computer, and the data collector is connected between the computer and the pressure gauge P1 and between the computer and the flowmeter F1.
3. The apparatus for judging the state of a continuous casting secondary cooling water nozzle as claimed in claim 2, wherein the pressure gauge P1 and the flow meter F1 are digital.
4. The apparatus for determining the state of a continuous casting secondary cooling water nozzle according to claim 2, wherein the frequency of the acquired data is H-0.1 in hz.
5. The apparatus for determining the state of a continuous casting secondary cooling water nozzle according to claim 2, wherein determining the instantaneous operating state of the circuit based on the theoretical spray water pressure and the actual spray water pressure of the circuit comprises:
presetting 4 thresholds theta 1, theta 2, theta 3 and theta 4, wherein theta 1> theta 2> theta 3> theta 4;
presetting 5 instantaneous working states, namely a state 1-a blocking state, a state 2-a slight blocking state, a state 3-a normal state, a state 4-a slight leakage state and a state 5-a leakage state;
the theoretical spray water pressure and the actual spray water pressure deviation ratio sigma are calculated as follows
σ＝(Paw－Ptw)/Ptw
If σ>θ1The instantaneous operating state of the circuit is state 1;
if theta 2< sigma is less than or equal to theta 1, the instantaneous working state of the loop is in a state 2;
if theta 3< sigma is less than or equal to theta 2, judging that the instantaneous working state of the loop is in a state 3;
if theta 4< sigma is less than or equal to theta 3, the instantaneous working state of the loop is judged to be a state 4;
if sigma is less than or equal to theta 4, the instantaneous working state of the loop is judged to be a state 5.
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| CN112958751A (en) * | 2021-01-27 | 2021-06-15 | 唐山不锈钢有限责任公司 | Online prediction and management method for continuous casting secondary cooling state |
| CN115026256A (en) * | 2022-07-11 | 2022-09-09 | 中冶赛迪工程技术股份有限公司 | Identification method and system for continuous casting secondary cooling spraying state |
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| CN111451469B (en) | 2021-08-06 |
| CN111451469A (en) | 2020-07-28 |
| CN113649539B (en) | 2022-08-26 |
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