CN102328044B - Automatic liquid level control method for crystallizer of large square bland continuous-casting machine - Google Patents
Automatic liquid level control method for crystallizer of large square bland continuous-casting machine Download PDFInfo
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Abstract
The invention relates to an automatic liquid level control method for a crystallizer of a large square bland continuous-casting machine, and belongs to the metallurgical steel-making technical field. According to the technical scheme, the automatic liquid level control method comprises the following steps: firstly setting a liquid level output value to be a sinusoidal variation curve; secondly controlling the actual liquid level value to change according to the set liquid level output value by a PID (proportion integration differentiation) control module in a liquid level control program of a computer so as to finally realize sinusoidal liquid level control of the crystallizer. The automatic liquid level control method has the beneficial effects that by programming and setting the control module, the actual liquid level value of the crystallizer is changed according to the set liquid level value as well as the change cycle and amplitude so as to realize sinusoidal liquid level control on the crystallizer, thereby effectively reducing the erosion rate of a submersed nozzle of a large square bland, prolonging the continuous casting time and improving the surface quality of casting blank. Statistical data shows that the automatic liquid level control method has obvious effect of prolonging the service life of the nozzle and the continuous casting time; and meanwhile as the liquid level of the crystallizer is active and casting powder has good slagging effect, the repair rate of the (casting) blank and (steel) products caused by surface defects is lowered.
Description
Technical field
The present invention relates to a kind of large square bland continuous-casting machine mold liquid level autocontrol method, especially relate to a kind of reduction bloom submersed nozzle erosion rate, extend to connect and water the time, enliven the bloom mold liquid level, improve the novel crystallization device automatic liquid surface control method of surface quality of continuously cast slab, belong to metallurgical steelmaking technical field.
Background technology
In metallurgical steelmaking technical field, the level control principle of background technology is: level setpoint is a constant, and the actual value of liquid level is carried out the PID adjusting according to setting value, to reach the function of stable crystalline device liquid level.Be a steady state value owing to setting liquid level, slag line easily occurs and corrode narrow range, the large phenomenon of mouth of a river melting loss speed, when particularly using the Integral nozzle cast, the mouth of a river life-span is wrapped service life in directly determining, mouth of a river melting loss speed is large, has seriously restricted the service life of middle bag, has greatly increased middle Bao Naicai cost.Meniscus position crystallizer copper tube wall is subjected to the slag interface erosion corrosion to cause easily that thereby wall coating comes off in the meniscus copper pipe, tapering changes affects casting billet surface and subcutaneous quality for a long time in addition.Because the bloom section is large, exist pulling rate relatively low, it is especially outstanding that the sluggish characteristics of mold liquid level, submersed nozzle erosive velocity reach the relatively poor problem of the surface quality of strand soon.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of large square bland continuous-casting machine mold liquid level autocontrol method, by coding and liquid level actual value that control module makes crystallizer is set realizes according to level setpoint and cycle thereof, amplitude that mould liquid level is sinusoidal and control, can effectively reduce bloom submersed nozzle erosion rate, improve to connect and water the time and improve cc billet surface quality.
Technical scheme of the present invention is: a kind of large square bland continuous-casting machine mold liquid level autocontrol method, comprise following processing step: at first, the liquid level output valve is set as a sinusoidal variations curve, secondly, the actual value that pid control module in computer level control program is controlled liquid level changes according to liquid level output setting value, at last, realize the sinusoidal control of mould liquid level.
Said the liquid level output valve is set as a sinusoidal variations curve, sets the parameter of liquid level sinusoidal variations curve according to man-machine interface, comprise liquid level gauging range, setting value, cycle, amplitude etc.
For 300mm * 360mm section bloom, logic approach for mold level control parameter of the present invention is: the liquid level gauging range is: 120mm; Level setpoint is: 90mm(75%); Amplitude is: ± 5mm; Cycle is: 5min.
Principle of the present invention:
(b=0 is so the sine formula that we use is: Y=Sin (ω χ) for ω χ+φ)+b, φ in this Mathematical Modeling=0 according to sine formula Y=Sin.
State some variablees according to our needs of level control know-why: level setpoint: In_SetLV liquid level output valve: IO_SetLV liquid level amplitude: the mm of In_UD(unit) the level change cycle In_CT(unit minute).
The PLC that carries out this program is Siemens S7-300, and its scan period is 100ms, so we are divided into In_CT * 600 change points with the period of change of setting, the statement change point is TempStart, and the level change amount TempStep that each change point is corresponding is:
TempStep=?In_UD×Sin((2π÷(In_CT×600))?×TempStart)。
According to above we can draw level value IO_SetLV corresponding to each change point and be:
IO_SetLV?=In_SetLV+?TempStep
The liquid level output valve is a sinusoidal variations trend, and the actual value that the pid control module in program is controlled liquid level changes according to liquid level output setting value, has so just realized the sinusoidal control of mould liquid level.
Beneficial effect of the present invention: by coding and liquid level actual value that control module makes crystallizer is set realizes according to level setpoint and cycle thereof, amplitude that mould liquid level is sinusoidal and control, can effectively reduce bloom submersed nozzle erosion rate, improve to connect and water the time and improve cc billet surface quality.Show by the statistics usage data; the present invention plays obvious effect to the service life, the raising company's time of watering that extend the mouth of a river; active because of mold liquid level simultaneously, protection scorification slag is good, and (casting) base, (steel) material of causing because of blemish send the rate of repairing to decrease.
Description of drawings
Accompanying drawing 1 is background technology level control schematic diagram;
Accompanying drawing 2 is level control schematic diagram of the present invention;
Accompanying drawing 3 is the changing trend diagram of embodiment of the present invention one-period.
The specific embodiment
The present embodiment is 300mm * 360mm section bloom, and logic approach for mold level control parameter of the present invention is: the liquid level gauging range is: 120mm; Level setpoint is: 75%(liquid level 90mm); Mold liquid level optimum detection scope is: 70 ~ 80%(liquid level scope 84 ~ 96mm), desired value 75%(liquid level 90mm); Amplitude: (84 ~ 96mm), set amplitude is ± 5mm that namely altitude range is 85 ~ 95mm, in mould liquid level optimum detection scope according to mould liquid level optimum detection altitude range; Cycle: according to the experiment situation, the cycle is when being set in 1 ~ 4min, and it is fast that mold liquid level changes (rise, decrease speed fast) speed, and liquid fluctuating is large, easily produces slag bar, impact cast in crystallizer; During cycle setting＞5min, mould liquid level changes slowly, and the DeGrain of sinusoidal level control is summed up by on-site actual situations, and the cycle is set as 5min.
The one-period changing trend diagram of embodiment is with reference to accompanying drawing 2.
Show by the statistics usage data; the present invention plays obvious effect to the service life, the raising company's time of watering that extend the mouth of a river; active because of mold liquid level simultaneously, protection scorification slag is good, and (casting) base, (steel) material of causing because of blemish send the rate of repairing to decrease.Before and after using, correction data sees Table one:
Below provide embodiment more specifically:
Embodiment 1: large square bland continuous-casting machine section 300mm * 360mm, produce steel grade 40Cr, and its casting parameters sees the following form:
Observe continuous cast mold liquid level situation in steel pouring process, 1 stream mold liquid level is inactive, and it is bad that covering slag is sprawled situation, covering slag thick middle (45mm) in crystallizer, and both sides thin (20mm) measures liquid slag layer thickness 8-10mm, covering slag consumption 0.40kg/t; 3 stream mold liquid levels are active, and covering slag is sprawled in order, and (28 ~ 32mm), fusing is evenly measured liquid slag layer thickness 8-10mm, covering slag consumption 0.43kg/t to the covering slag even thickness;
Stop watering the mouth of a river and measure, 1 flowing water mouth slag line width 12mm, 3 flowing water mouth slag line width 25mm; 1 flowing water mouth slag lining residual thickness 5mm, 3 stream slag lining residual thickness 12mm.
Get the pickling of casting billet surface sample and observe, 1,3 stream casting billet surfaces are smooth without depression, without face crack; 1,3 stream strand low multiple qualities are good, and check is without subcutaneous and middle slag inclusion.
Embodiment 2: large square bland continuous-casting machine section 300mm * 360mm, produce steel grade 20CrMnTi, and its casting parameters sees the following form:
Observe continuous cast mold liquid level situation in steel pouring process, 1 stream mold liquid level is active, and covering slag is sprawled in order, and (30 ~ 34mm), fusing is evenly measured liquid slag layer thickness 8-10mm, covering slag consumption 0.45kg/t to the covering slag even thickness; 3 stream mold liquid levels are inactive, and it is bad that covering slag is sprawled situation, covering slag thick middle (48mm) in crystallizer, and both sides thin (23mm) measures liquid slag layer thickness 8-10mm, covering slag consumption 0.48kg/t;
Stop watering the mouth of a river and measure, 1 flowing water mouth slag line width 26mm, 3 flowing water mouth slag line width 13mm; 1 flowing water mouth slag lining residual thickness 12mm, 3 stream slag lining residual thickness 7mm.
Get the pickling of casting billet surface sample and observe, 1,3 stream casting billet surfaces are smooth without depression, without face crack; 1,3 stream strand low multiple qualities are good, and check is without subcutaneous and middle slag inclusion.
Embodiment 3: large square bland continuous-casting machine section 300mm * 360mm, produce steel grade GCr15, and its casting parameters sees the following form:
Observe continuous cast mold liquid level situation in steel pouring process, 1 stream mold liquid level is active, and covering slag is sprawled in order, and (32 ~ 37mm), fusing is evenly measured liquid slag layer thickness 9-11mm, covering slag consumption 0.25kg/t to the covering slag even thickness; 3 stream mold liquid levels are inactive, and it is bad that covering slag is sprawled situation, covering slag thick middle (52mm) in crystallizer, and both sides thin (29mm) measures liquid slag layer thickness 9-11mm, covering slag consumption 0.23kg/t;
Stop watering the mouth of a river and measure, 1 flowing water mouth slag line width 28mm, 3 flowing water mouth slag line width 15mm; 1 flowing water mouth slag lining residual thickness 13mm, 3 stream slag lining residual thickness 7mm.
Get the pickling of casting billet surface sample and observe, 1,3 stream casting billet surfaces are smooth without depression, without face crack; 1,3 stream strand low multiple qualities are good, and check is without subcutaneous and middle slag inclusion.
Embodiment 4: large square bland continuous-casting machine section 300mm * 360mm, produce steel grade 20CrMoH, and its casting parameters sees the following form:
Observe continuous cast mold liquid level situation in steel pouring process, three stream mold liquid levels are active, and covering slag is sprawled in order, and (30 ~ 33mm), fusing is evenly measured liquid slag layer thickness 8-10mm, covering slag consumption 0.45kg/t to the covering slag even thickness.
Stop watering the mouth of a river and measure, 1,2,3 flowing water mouth slag line width are respectively 25mm, 26mm, 25mm, 1,2,3 flowing water mouth slag lining residual thickness 11mm, 13mm, 11mm.
Get the pickling of casting billet surface sample and observe, 1,2,3 stream casting billet surfaces are smooth without depression, without face crack; The strand low multiple quality is all good, and check is without subcutaneous and middle slag inclusion.
Embodiment 5: large square bland continuous-casting machine section 300mm * 360mm, produce steel grade 42CrMo, and its main casting parameters sees the following form:
Observe continuous cast mold liquid level situation in steel pouring process, three stream mold liquid levels are active, and covering slag is sprawled in order, and (28 ~ 32mm), fusing is evenly measured liquid slag layer thickness 8-10mm, covering slag consumption 0.44kg/t to the covering slag even thickness.
Stop watering the mouth of a river and measure, 1,2,3 flowing water mouth slag line width are respectively 26mm, 26.5mm, 26mm, 1,2,3 flowing water mouth slag lining residual thickness 9mm, 11mm, 9mm.
Get the pickling of casting billet surface sample and observe, 1,2,3 stream casting billet surfaces are smooth without depression, without face crack; The strand low multiple quality is all good, and check is without subcutaneous and middle slag inclusion.
Claims (2)
1. large square bland continuous-casting machine mold liquid level autocontrol method, it is characterized in that comprising following processing step: at first, the liquid level output valve is set as a sinusoidal variations curve, secondly, the actual value that pid control module in computer level control program is controlled liquid level changes according to liquid level output setting value, at last, realize the sinusoidal control of mould liquid level; Concrete grammar is as follows: set the parameter of liquid level sinusoidal variations curve according to man-machine interface, comprise liquid level gauging range, level setpoint, level change cycle, liquid level amplitude; Sine formula is: Y=Sin (ω χ), level setpoint: In_SetLV; Liquid level output valve: IO_SetLV; Liquid level amplitude: In_UD, the mm of unit; Level change cycle In_CT, unit minute;
The PLC that carries out this program is Siemens S7-300, and its scan period is 100ms, and the level change cycle of setting is divided into In_CT * 600 change points, and the statement change point is TempStart, and the level change amount TempStep that each change point is corresponding is:
TempStep=?In_UD×Sin((2π÷(In_CT×600))?×TempStart)；
Drawing liquid level output valve IO_SetLV corresponding to each change point is:
IO_SetLV?=In_SetLV+?TempStep
The liquid level output valve is a sinusoidal variations trend, and the actual value that the pid control module in program is controlled liquid level changes according to liquid level output setting value, has so just realized the sinusoidal control of mould liquid level.
2. a kind of large square bland continuous-casting machine mold liquid level autocontrol method according to claim 1, is characterized in that logic approach for mold level control parameter of the present invention is: the liquid level gauging range is: 120mm for 300mm * 360mm section bloom; Level setpoint is: 90mm; The liquid level amplitude is: ± 5mm; The level change cycle: 5min.
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| CN104334298B (en) * | 2012-06-07 | 2016-05-18 | 杰富意钢铁株式会社 | Molten steel liquid level control method in casting mold |
| CN104281166B (en) * | 2013-07-04 | 2017-03-01 | 中国钢铁股份有限公司 | The liquid level controlling method of conticaster |
| CN103447487A (en) * | 2013-07-29 | 2013-12-18 | 山西太钢不锈钢股份有限公司 | Casting method |
| CN106955984B (en) * | 2016-01-08 | 2019-04-23 | 宝山钢铁股份有限公司 | Handle the autocontrol method of continuous casting channel blockage |
| CN105945252A (en) * | 2016-06-20 | 2016-09-21 | 首钢总公司 | Method for controlling fluctuation of liquid level of crystallizer |
| CN107282907A (en) * | 2017-05-17 | 2017-10-24 | 河钢股份有限公司邯郸分公司 | The method that continuous cast mold liquid fluctuating qualification rate is counted using PLC program |
| CN107308678B (en) * | 2017-06-19 | 2019-06-07 | 青海盐湖工业股份有限公司 | A kind of automatic control system of crystallizer |
| CN115301911B (en) * | 2022-08-15 | 2024-04-12 | 广西钢铁集团有限公司 | Pulling speed control method in billet casting operation |
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Effective date of registration: 20180413 Address after: 115004 Liaoning Yingkou coastal industrial base management committee Xin Lian Jie East 1. Patentee after: CERI YINGKOU EQUIPMENT DEVELOPMENT AND MANUFACTURING CO., LTD. Address before: 050031 No. 363 Heping East Road, Hebei, Shijiazhuang Co-patentee before: Hebei Iron & Steel Group Co., Ltd. Patentee before: Shijiazhuang Iron & Steel Co., Ltd. |