CN103192047B - Conticaster crystallizer automatic cooling water control system and control method thereof - Google Patents

Conticaster crystallizer automatic cooling water control system and control method thereof Download PDF

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CN103192047B
CN103192047B CN201310055656.9A CN201310055656A CN103192047B CN 103192047 B CN103192047 B CN 103192047B CN 201310055656 A CN201310055656 A CN 201310055656A CN 103192047 B CN103192047 B CN 103192047B
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crystallizer
cooling water
water flow
value
cpu
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CN103192047A (en
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韩基伟
杨文玉
李台龙
丁晓志
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Baotou Iron and Steel Group Co Ltd
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Abstract

The invention discloses a kind of Novel connection casting machine crystallizer automatic cooling water control system and control method thereof, the present invention calculates the heat flow value of crystallizer by the inflow temperature detector on crystallizer and return water temperature detector, according to heat flow value, crystallizer cooling water setting flow being revised, reaching by changing cooling water water distribution quantity the impact eliminated on slab quality and casting safety when crystallizer heat conductivility changes.

Description

Conticaster crystallizer automatic cooling water control system and control method thereof
Technical field
The present invention relates to a kind of conticaster automatic control technology, especially relate to a kind of conticaster crystallizer automatic cooling water control system and control method thereof.
Background technology
In the conticaster production of metallurgical industry, crystallizer is one of equipment of most critical, and crystallizer cooling water control system is one of key factor of conticaster efficient stable production.How the high-quality work of efficient stable is people's issues that need special attention always to conticaster, crystallizer water quench intensity is improper can affect the serious accident that cc billet surface quality even brings out bleed-out, therefore set up reliable crystallizer cooling water water allocation model, the water distribution strategy of application of advanced is the key improving slab quality, improve casting efficiency.
As shown in Figure 1, be the workflow diagram of model-controlled system in prior art; As shown in Figure 2, be model cootrol schematic diagram in prior art.Model-controlled system comprises the structures such as electromagnetic flowmeter, data acquisition module, CPU, signal output module, pneumatic control valve, communication module, second-level model and man machine operation interface (HMI).
The crystallizer cooling pool of continuous casting is loosened cooling zone, four, side formed by narrow limit, crystallizer fixation side, crystallizer on the right side of limit narrow on the left of crystallizer, crystallizer.The current crystallizer cooling water water management model used based on strand steel grade and section, namely according to different steel grade, different section sets the different crystallizer cooling water water water yields, only when strand steel grade and section change, the crystallizer cooling water water yield changes, the method is based on production practices, with reference to the water distribution quantity inducing classification of repeatedly qualified strand, and in conjunction with certain Study on Mathematic Model, the relation of the steel grade determined and the section syncrystallization device cooling water water distribution water yield, be stored in host computer with the form of water meter, carry out PID by PLC according to the crystallizer cooling water water water distribution quantity that host computer water meter sets automatically to control.
Said method PLC can ensure that crystallizer water distribution quantity is consistent with section variation with steel grade.Above-mentioned crystallizer cooling water control system is only relevant with the water yield and steel grade, does not consider the heat conductivility of crystallizer.It is no problem that this model uses when casting cycle is stable.
But this model has obvious defect: only can normally use when casting cycle is stable, cannot be suitable for when site environment or technological factor change.When in molten steel, protium content increases, the heat conductivility of crystallizer protecting residue worsens, and crystallizer heat conductivility changes.Casting blank shell in crystallizer can be caused to generate uneven even base shell generation thickness deficiency if the cooling water specified rate still calculated according to model carries out casting, affect slab quality and even bring out bleed-out.
Summary of the invention
Technical problem solved by the invention is to provide a kind of conticaster crystallizer automatic cooling water control system, overcomes the impact on slab quality and casting safety when crystallizer heat conductivility changes.
Technical scheme is as follows:
A kind of conticaster crystallizer automatic cooling water control system, comprising:
Inflow temperature detector, for detecting the inflow temperature of crystallizer, and sends to data acquisition module by the crystallizer inflow temperature value detected;
Return water temperature detector, for detecting the return water temperature of crystallizer, and sends to data acquisition module by the crystallizer return water temperature value detected;
Electromagnetic flowmeter, for detecting the cooling water flow of crystallizer, and is sent to data acquisition module by actual cooling water flow value;
Data acquisition module, for cooling water flow value, crystallizer inflow temperature value and crystallizer return water temperature value being converted to respectively the signal that CPU identifies, and is sent to described CPU by the signal after process;
CPU, the setting cooling water flow value obtained according to crystallizer inflow temperature value and crystallizer return water temperature value and the actual cooling water flow value of current crystallizer carry out PID arithmetic, formation control signal, and described control signal is sent to signal output module; Then control pneumatic control valve by described signal output module and start action, until the actual cooling water flow value of described electromagnetic flowmeter feedback with revised setting cooling water flow value deviation within the specific limits; Described CPU calculates the actual heat flow value of current crystallizer according to crystallizer inflow temperature value and crystallizer return water temperature value, and actual heat flow value is compared draw hot-fluid deviate with the setting benchmark heat flow value be stored in described CPU, calculate revised setting cooling water flow value according to hot-fluid deviate; Described CPU calculates the actual cooling water flow value of described current crystallizer according to the cooling water flow signal of electromagnetic flowmeter subsequently; Described CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow value is sent in described CPU by cooling water water allocation model, and the crystallizer inflow temperature value received in conjunction with data acquisition module after described CPU receives signal and crystallizer return water temperature value calculate revised setting cooling water flow value;
Signal output module, sends to pneumatic control valve for the described control signal generated by CPU;
Pneumatic control valve, regulates aperture according to the control signal received, realizes the adjustment of crystallizer cooling water.
Further: setting cooling water flow value is obtained by formula Q=a △ T+Qs and △ T=Ts-Tp; Wherein, Q is the water distribution quantity of crystallizer cooling zone; a is the crystallizer cooling zone controling parameters under specific steel grade and section condition; △ T is the hot-fluid deviate under specific steel grade, specific covering slag and specific section condition; Ts is the setting benchmark hot-fluid setting value be stored in CPU; Tp is the actual heat flow value calculating current crystallizer, and Qs is the cooling water flow setting value that traditional cooling water water allocation model draws.
Further: in described control signal, the opening degree of pneumatic control valve is obtained by formula F=K (KP △ Q+KI × ∫ △ Q.dt) and Δ Q=Q – Qp; Wherein, F is the opening degree of pneumatic control valve, and K represents the coefficient of PID, and KP represents proportionality coefficient, and KI represents integral coefficient, and Qp is for calculating the actual cooling water flow of current crystallizer, and Δ Q is the deviate of cooling water flow.
Another technical problem solved by the invention is to provide a kind of conticaster crystallizer cooling water autocontrol method, overcomes the impact on slab quality and casting safety when crystallizer heat conductivility changes.
Technical scheme is as follows:
A kind of conticaster crystallizer cooling water autocontrol method, comprising:
Inflow temperature detector detects the inflow temperature of crystallizer, and the crystallizer inflow temperature value detected is sent to data acquisition module;
Return water temperature detector detects the return water temperature of crystallizer, and the crystallizer return water temperature value detected is sent to data acquisition module;
Electromagnetic flowmeter detects the cooling water flow of crystallizer, and actual cooling water flow value is sent to data acquisition module;
Cooling water flow value, crystallizer inflow temperature value and crystallizer return water temperature value are converted to the signal that CPU identifies by data acquisition module respectively, and the signal after process is sent to CPU;
The setting cooling water flow value that CPU obtains according to crystallizer inflow temperature value and crystallizer return water temperature value and the actual cooling water flow value of current crystallizer carry out PID arithmetic, formation control signal, and described control signal is sent to signal output module; Then control pneumatic control valve by described signal output module and start action, until the actual cooling water flow value of described electromagnetic flowmeter feedback with revised setting cooling water flow value deviation within the specific limits; Described CPU calculates the actual heat flow value of current crystallizer according to crystallizer inflow temperature value and crystallizer return water temperature value, and actual heat flow value is compared draw hot-fluid deviate with the setting benchmark heat flow value be stored in described CPU, calculate revised setting cooling water flow value according to hot-fluid deviate; CPU calculates the actual cooling water flow value of described current crystallizer according to the cooling water flow signal of electromagnetic flowmeter subsequently; Described CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow value is sent in described CPU by cooling water water allocation model, the crystallizer inflow temperature value received in conjunction with data acquisition module after described CPU receives signal and crystallizer return water temperature value calculate revised setting cooling water flow value;
The described control signal that CPU generates by signal output module sends to pneumatic control valve;
Pneumatic control valve regulates aperture according to the control signal received, and realizes the adjustment of crystallizer cooling water.
Further: setting cooling water flow value is obtained by formula Q=a △ T+Qs and △ T=Ts-Tp; Wherein, Q is the water distribution quantity of crystallizer cooling zone; a is the crystallizer cooling zone controling parameters under specific steel grade and section condition; △ T is the hot-fluid deviate under specific steel grade, specific covering slag and specific section condition; Ts is the setting benchmark hot-fluid setting value be stored in CPU; Tp is the actual heat flow value calculating current crystallizer, and Qs is the cooling water flow setting value that traditional cooling water water allocation model draws.
Further: in described control signal, the opening degree of pneumatic control valve is obtained by formula F=K (KP △ Q+KI × ∫ △ Q.dt) and Δ Q=Q – Qp; Wherein, F is the opening degree of pneumatic control valve, and K represents the coefficient of PID, and KP represents proportionality coefficient, and KI represents integral coefficient, and Qp is the actual cooling water flow of current crystallizer calculated, the deviate of Δ Q cooling water flow.
Compared with prior art, technique effect comprises:
1, the present invention not only considers different steel grade, different section sets the different crystallizer cooling water water water yields to the impact of the crystallizer cooling water water yield, also set when crystallizer heat conductivility changes and regulate crystallizer cooling water flow, thus reach the impact on strand when eliminating the change of crystallizer heat conductivility.So, instant invention overcomes the impact on slab quality and casting safety when crystallizer heat conductivility changes.
2, the present invention is utilized can to save impact because bleed-out accident causes.
Often there is a bleed-out accident impact and produce 6 hours, production per hour 240 tons, strand per ton 2000 yuan calculating, damage 6 × 240 × 2,00=,288 ten thousand, each bleed-out need change tundish, crystallizer, fan 0 section, crystallizer maintenance cost=200,000 yuan/, fan 0 section of maintenance cost=150,000 yuan/, tundish expense=1.5 ten thousand yuan/.Each bleed-out loses 2,880,000 yuan+20 ten thousand yuan+15 ten thousand yuan+1.5 ten thousand yuan=324.5 ten thousand yuan altogether.Namely a bleed-out accident is often prevented can to save 234.5 ten thousand yuan.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of model-controlled system in prior art;
Fig. 2 is the schematic diagram of control method in prior art;
Fig. 3 is the workflow diagram of model Ore-controlling Role in the present invention;
Fig. 4 is control method schematic diagram in the present invention.
Detailed description of the invention
The present invention is directed to the fluctuation of crystallizer heat conductivility and this problem is affected on crystallizer cooling water water distribution quantity, develop a kind of conticaster crystallizer automatic cooling water control system and control method, be intended to eliminate the impact on casting safety and slab quality when crystallizer heat conductivility changes.
Conticaster crystallizer automatic cooling water control system provided by the invention and control method are the crystallizer cooling water control devices based on crystallizer hot-fluid, slab steel grade and slab section.
As described in Figure 3, be the workflow diagram of model-controlled system in the present invention.Conticaster crystallizer automatic cooling water control system provided by the invention, model-controlled system of the prior art is improved, crystallizer adds inflow temperature detector, return water temperature detector, improve the function of central processing unit (CPU), inflow temperature detector, return water temperature detector are connected to data acquisition module by cable; Inflow temperature detector, return water temperature detector are respectively used to detect the water inlet of crystallizer and the temperature of backwater, and crystallizer inflow temperature signal and crystallizer return water temperature signal are sent to data acquisition module by cable, the signal after process is sent in central processing unit (CPU) by data acquisition module.
As shown in Figure 4, be control method schematic diagram in the present invention.The invention provides a kind of brand-new control method, the heat flow value of crystallizer is calculated by the inflow temperature detector on crystallizer and return water temperature detector, according to heat flow value, crystallizer cooling water setting flow being revised, reaching by changing cooling water water distribution quantity the impact eliminated on slab quality and casting safety when crystallizer heat conductivility changes.Control method is: CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow is sent in CPU by cooling water water allocation model, the revised setting cooling water flow that the inflow temperature detector received in conjunction with data acquisition module after CPU receives signal and return water temperature detector calculate, then by signal output module control pneumatic control valve start action until electromagnetic flowmeter feedback actual cooling water flow with revised setting cooling water flow deviate within the specific limits.
Below in conjunction with Fig. 3 and Fig. 4, the function of the inflow temperature detector on crystallizer, return water temperature detector, electromagnetic flowmeter, data acquisition module, CPU, signal output module, pneumatic control valve and HMI interface module and the course of work are elaborated.
Inflow temperature detector, for detecting the inflow temperature of crystallizer, and sends to data acquisition module by the crystallizer inflow temperature value detected.
Return water temperature detector, for detecting the return water temperature of crystallizer, and sends to data acquisition module by the crystallizer return water temperature value detected.
Electromagnetic flowmeter, for detecting the cooling water flow of crystallizer, and is sent to data acquisition module by cooling water flow value.
Data acquisition module, for cooling water flow value, crystallizer inflow temperature value and crystallizer return water temperature value are converted to CPU discernible signal, is sent to the signal after process in CPU.
Cooling water water allocation model, for setting different crystallizer cooling water flows according to different casting blank steel grade, different section, only when strand steel grade and section change, crystallizer cooling water flow changes; Cooling water water allocation model is based on production practices, with reference to the water distribution quantity inducing classification of repeatedly qualified strand, and in conjunction with certain Study on Mathematic Model, and the relation of the strand steel grade determined and section syncrystallization device cooling water distributed water flow.
CPU, carries out PID arithmetic, formation control signal according to setting cooling water flow value and actual cooling water flow value, and control signal is sent to pneumatic control valve by signal output module, controls pneumatic control valve and regulates cooling water flow.CPU by signal output module control pneumatic control valve start action until electromagnetic flowmeter feedback actual cooling water flow with revised setting cooling water flow difference within the specific limits, reach eventually through changing cooling water water distribution quantity the impact eliminated on slab quality and casting safety when crystallizer heat conductivility changes.CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow is sent in CPU by cooling water water allocation model, and the inflow temperature value received in conjunction with data acquisition module after CPU receives signal and return water temperature value calculate revised setting cooling water flow value.
Signal output module, sends to pneumatic control valve for the control signal generated by CPU.
Pneumatic control valve, regulates aperture according to control signal, realizes the adjustment of crystallizer cooling water, carry out crystallization control device cooling water flow by pneumatic control valve, thus reaches the impact on strand when eliminating the change of crystallizer heat conductivility.
HMI interface module, is realized and the real-time Communication for Power of CPU by communication module, can monitor the signal that PLC control system transmission comes in real time, generation alarm signal and failure diagnosis information.
Below in conjunction with accompanying drawing 4, control method is elaborated.
CPU, the actual heat flow value of current crystallizer is calculated according to crystallizer inflow temperature signal and crystallizer return water temperature signal, and actual heat flow value is compared draw hot-fluid deviate with the setting benchmark heat flow value be stored in CPU, calculate revised cooling water flow setting value according to hot-fluid deviate.This part controls to be summarized as following mathematic(al) representation:
Q=a△T+Qs,△T=Ts-Tp
Wherein Q is the water distribution quantity of crystallizer cooling zone;
A is the crystallizer cooling zone controling parameters under specific steel grade, section condition;
△ T is the hot-fluid deviate under specific steel grade, specific covering slag, specific section condition;
Ts is the setting benchmark hot-fluid setting value be stored in CPU;
Tp is the actual heat flow value calculating current crystallizer;
Qs is the cooling water flow setting value that traditional cooling water water allocation model draws.
CPU calculates the actual cooling water flow value of current crystallizer according to the cooling water flow value of electromagnetic flowmeter subsequently; Carry out PID arithmetic, formation control signal according to setting cooling water flow value and actual cooling water flow value, and control signal is sent to pneumatic control valve by signal output module, control pneumatic control valve and carry out regulating water flow.This part control method can be summarized as following mathematic(al) representation:
F=K(KP△Q+KI×∫△Q.dt),ΔQ=Q–Qp
Wherein, F is the opening degree of pneumatic control valve;
K represents the coefficient of PID;
KP represents proportionality coefficient;
KI represents integral coefficient;
Qp is for calculating the actual cooling water flow of current crystallizer;
The deviate of Δ Q cooling water flow;
The impact eliminated on slab quality and casting safety when crystallizer heat conductivility changes is reached eventually through changing cooling water water distribution quantity.
What more than enumerate is only a specific embodiment.Obvious the present invention is not only confined to above embodiment, can also have many distortion.As PLC system DCS system is substituted.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.

Claims (6)

1. a conticaster crystallizer automatic cooling water control system, comprising:
Inflow temperature detector, for detecting the inflow temperature of crystallizer, and sends to data acquisition module by the crystallizer inflow temperature value detected;
Return water temperature detector, for detecting the return water temperature of crystallizer, and sends to data acquisition module by the crystallizer return water temperature value detected;
Electromagnetic flowmeter, for detecting the cooling water flow of crystallizer, and is sent to data acquisition module by actual cooling water flow value;
Data acquisition module, for cooling water flow value, crystallizer inflow temperature value and crystallizer return water temperature value being converted to respectively the signal that CPU identifies, and is sent to described CPU by the signal after process;
CPU, the setting cooling water flow value obtained according to crystallizer inflow temperature value and crystallizer return water temperature value and the actual cooling water flow value of current crystallizer carry out PID arithmetic, formation control signal, and described control signal is sent to signal output module; Then control pneumatic control valve by described signal output module and start action, until the actual cooling water flow value of described electromagnetic flowmeter feedback with revised setting cooling water flow value deviation within the specific limits; Described CPU calculates the actual heat flow value of current crystallizer according to crystallizer inflow temperature value and crystallizer return water temperature value, and actual heat flow value is compared draw hot-fluid deviate with the setting benchmark heat flow value be stored in described CPU, calculate revised setting cooling water flow value according to hot-fluid deviate; Described CPU calculates the actual cooling water flow value of described current crystallizer according to the cooling water flow signal of electromagnetic flowmeter subsequently; Described CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow value is sent in described CPU by cooling water water allocation model, and the crystallizer inflow temperature value received in conjunction with data acquisition module after described CPU receives signal and crystallizer return water temperature value calculate revised setting cooling water flow value;
Signal output module, sends to pneumatic control valve for the described control signal generated by CPU;
Pneumatic control valve, regulates aperture according to the control signal received, realizes the adjustment of crystallizer cooling water.
2. conticaster crystallizer automatic cooling water control system as claimed in claim 1, is characterized in that: setting cooling water flow value is obtained by formula Q=a △ T+Qs and △ T=Ts-Tp; Wherein, Q is the water distribution quantity of crystallizer cooling zone; a is the crystallizer cooling zone controling parameters under specific steel grade and section condition; △ T is the hot-fluid deviate under specific steel grade, specific covering slag and specific section condition; Ts is the setting benchmark hot-fluid setting value be stored in CPU; Tp is the actual heat flow value calculating current crystallizer, and Qs is the cooling water flow setting value that traditional cooling water water allocation model draws.
3. conticaster crystallizer automatic cooling water control system as claimed in claim 2, is characterized in that: in described control signal, the opening degree of pneumatic control valve is obtained by formula F=K (KP △ Q+KI × ∫ △ Q.dt) and Δ Q=Q – Qp; Wherein, F is the opening degree of pneumatic control valve, and K represents the coefficient of PID, and KP represents proportionality coefficient, and KI represents integral coefficient, and Qp is for calculating the actual cooling water flow of current crystallizer, and Δ Q is the deviate of cooling water flow.
4. a conticaster crystallizer cooling water autocontrol method, comprising:
Inflow temperature detector detects the inflow temperature of crystallizer, and the crystallizer inflow temperature value detected is sent to data acquisition module;
Return water temperature detector detects the return water temperature of crystallizer, and the crystallizer return water temperature value detected is sent to data acquisition module;
Electromagnetic flowmeter detects the cooling water flow of crystallizer, and actual cooling water flow value is sent to data acquisition module;
Cooling water flow value, crystallizer inflow temperature value and crystallizer return water temperature value are converted to the signal that CPU identifies by data acquisition module respectively, and the signal after process is sent to CPU;
The setting cooling water flow value that CPU obtains according to crystallizer inflow temperature value and crystallizer return water temperature value and the actual cooling water flow value of current crystallizer carry out PID arithmetic, formation control signal, and described control signal is sent to signal output module; Then control pneumatic control valve by described signal output module and start action, until the actual cooling water flow value of described electromagnetic flowmeter feedback with revised setting cooling water flow value deviation within the specific limits; Described CPU calculates the actual heat flow value of current crystallizer according to crystallizer inflow temperature value and crystallizer return water temperature value, and actual heat flow value is compared draw hot-fluid deviate with the setting benchmark heat flow value be stored in described CPU, calculate revised setting cooling water flow value according to hot-fluid deviate; CPU calculates the actual cooling water flow value of described current crystallizer according to the cooling water flow signal of electromagnetic flowmeter subsequently; Described CPU is communicated with cooling water water allocation model by communication module, setting cooling water flow value is sent in described CPU by cooling water water allocation model, and the crystallizer inflow temperature value received in conjunction with data acquisition module after described CPU receives signal and crystallizer return water temperature value calculate revised setting cooling water flow value;
The described control signal that CPU generates by signal output module sends to pneumatic control valve;
Pneumatic control valve regulates aperture according to the control signal received, and realizes the adjustment of crystallizer cooling water.
5. conticaster crystallizer cooling water autocontrol method as claimed in claim 4, is characterized in that: setting cooling water flow value is obtained by formula Q=a △ T+Qs and △ T=Ts-Tp; Wherein, Q is the water distribution quantity of crystallizer cooling zone; a is the crystallizer cooling zone controling parameters under specific steel grade and section condition; △ T is the hot-fluid deviate under specific steel grade, specific covering slag and specific section condition; Ts is the setting benchmark hot-fluid setting value be stored in CPU; Tp is the actual heat flow value calculating current crystallizer, and Qs is the cooling water flow setting value that traditional cooling water water allocation model draws.
6. conticaster crystallizer cooling water autocontrol method as claimed in claim 5, is characterized in that: in described control signal, the opening degree of pneumatic control valve is obtained by formula F=K (KP △ Q+KI × ∫ △ Q.dt) and Δ Q=Q – Qp; Wherein, F is the opening degree of pneumatic control valve, and K represents the coefficient of PID, and KP represents proportionality coefficient, and KI represents integral coefficient, and Qp is the actual cooling water flow of current crystallizer calculated, the deviate of Δ Q cooling water flow.
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