CN104162638A - Crystallizer cooling water control device and method - Google Patents

Crystallizer cooling water control device and method Download PDF

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Publication number
CN104162638A
CN104162638A CN201410399554.3A CN201410399554A CN104162638A CN 104162638 A CN104162638 A CN 104162638A CN 201410399554 A CN201410399554 A CN 201410399554A CN 104162638 A CN104162638 A CN 104162638A
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branch road
water
temperature
backwater branch
backwater
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CN104162638B (en
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周士凯
王西林
刘赵卫
张西峰
王蓉
王新
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China National Heavy Machinery Research Institute Co Ltd
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Abstract

The invention provides a crystallizer cooling water control device and method. The crystallizer cooling water control device comprises a crystallizer for continuous casting, a water inlet main circuit is connected to the inlet end of the crystallizer for continuous casting, and the inner arc, the outer arc, the left side and the right side of the crystallizer for continuous casting are connected with an inner arc water return branch circuit, an outer arc water return branch circuit, a left side water return branch circuit and a right side water return branch circuit respectively. A first temperature sensor used for detecting the temperature of inlet water is arranged on the main water inlet circuit, and second temperature sensors used for detecting the temperature of return water of all branch circuits, electromagnetic flow meters used for calculating the flow of the return water of all the branch circuits and pneumatic film adjusting valves are arranged on the inner arc water return branch circuit, the outer arc water return branch circuit, the left side water return branch circuit and the right side water return branch circuit respectively. The cooling water amount of the inner arc, the cooling water amount of the right arc, the cooling water amount of the left side and the cooling water amount of the right side of the crystallizer are calculated according to the factors such as the steel type, the pull speed, the inlet water temperature, the inlet water and return water temperature difference, the molten steel superheat degree and the size of the cross section of a blank and PID adjustment of the water amount is realized through the electromagnetic flow meters and the pneumatic adjusting valves. During casting, casting blank heat transmission is improved and the occurrence rate of surface defects is reduced.

Description

A kind of crystallizer cooling water control device and method
Technical field
The invention belongs to metallurgical technology field, particularly a kind of crystallizer cooling water control device and method.
Background technology
In casting process, molten steel enters crystallizer by tundish, by crystallizer wall cooling, is formed and is had certain thickness base shell.Surface defect of bloom depends on the growth conditions of nascent solidified shell in crystallizer to a great extent, in crystallizer, the principal element of the nascent solidified shell growth of impact is the transmission of meniscus place hot-fluid, for example, if heat flow density is large, can cause nascent solidified shell growth inhomogeneous, easily at casting billet surface, produce the surface quality such as depression, longitudinal crack, transversal crack, star-like crack; If heat flow density is too small, can cause copper plate of crystallizer hot-face temperature too high, cause copper plate of crystallizer to reduce service life, and can cause the base shell of crystallizer end opening thin, easily cause the accidents such as bleed-out.Therefore, the heat transfer of the crystallization control device cooling water water yield and then control strand, is the important measures that reduce blemish.
For different steel grades, the strand of different section, in crystallizer, the size of heat flow density has an optimized scope, as long as the heat density that guarantees crystallizer is within the scope of this, the uniformity of initial solidification shell growth can be guaranteed, the thickness of crystallizer end opening base shell can be guaranteed out again.
At present, the crystallizer water yield is mainly to adjust according to the difference of steel grade, do not consider the influence factors such as pulling rate, the degree of superheat, inflow temperature, cross dimensions, make strand in crystallizer, easily produce blemish, the incipient stage of especially pouring into a mould, blemish is particularly serious, has increased the removing surface rate of strand.
Summary of the invention
For the problems referred to above, the invention provides a kind of crystallizer cooling water control device and method, it is a kind of new crystallizer water yield control technology, this invention is automatically to calculate outer arc in crystallizer, left and right sides cooling water inflow according to factors such as steel grade, pulling rate, inflow temperature, water inlet and backwater temperature difference, molten steel overheat, casting blank cross-section sizes, and the PID that realizes the water yield by electromagnetic flowmeter and pneumatic control valve regulates.During cast, improve the heat transfer of strand, reduced the incidence of blemish.
The present invention to achieve these goals, by the following technical solutions, a kind of crystallizer cooling water control device, comprise continuous cast mold, the arrival end of this continuous cast mold is connected with into water main line, and the inner arc of described continuous cast mold, outer arc, left side, right side connect respectively inner arc backwater branch road, outer arc backwater branch road, left side backwater branch road, right side backwater branch road;
Described water inlet main line is provided with the first temperature sensor for detection of inflow temperature;
On described inner arc backwater branch road, outer arc backwater branch road, left side backwater branch road, right side backwater branch road, be respectively equipped with the second temperature sensor for detection of each branch road return water temperature, add up the electromagnetic flowmeter of each branch road circling water flow rate, pneumatic diaphragm control valve.
Described water inlet main line is 4 water inlet branch roads, and respectively with inner arc, outer arc, the left side of continuous cast mold, right side connects, and is all provided with the first temperature sensor on each water inlet branch road.
A crystallizer cooling water control method, according to following steps, carry out:
1), 4 water inlet branch roads on water inlet main line, be respectively inner arc, outer arc, the left side of continuous cast mold, supply water in right side, and the first temperature sensor on Zhi Jinshui branch road carries out record to the water temperature on each water inlet branch road;
2), the second temperature sensor detects after continuous cast mold, the temperature of inner arc backwater branch road, outer arc backwater branch road, left side backwater branch road, right side each branch road backwater of backwater branch road;
3), the temperature that detects of temperature that the first temperature sensor is detected and the second temperature sensor contrasts, and calculates return water temperature and the inflow temperature degree of superheat △ T of backwater branch road;
4), according to following computing formula, calculate the water yield that backwater branch road needs;
Q＝Q min+f*ΔQ
Q max≤Q≤Q min
Q max＝10*A
Q min＝6*A
ΔQ＝Q max-Q min＝4*A
f＝f 1+f 2+f 3+f 4+f 5-f 6
In formula, Q is each backwater branch road water yield; Q maxfor each backwater branch road maximum amount of water, Q minfor each backwater branch road least quantity; A is crystallizer inner arc, outer arc, left side or right side copper coin water seam cross-sectional area; F is comprehensive correction factor; f 1for pulling rate correction factor; f 2for steel grade correction factor; f 3for strand flakiness ratio correction factor; f 4for inflow temperature correction factor; f 5for molten steel overheat correction factor; f 6for copper coin is shaped correction factor;
In formula,
0≤f≤1
For f 1, when pulling rate 0≤v≤2m/min, f 1=0.1*v;
When pulling rate v > 2m/min, f 1=0.2;
Wherein v is pulling rate, m/min.
For f 2,value is 01～0.4:
For f 3, work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.1; Work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.05;
For f 4, when inflow temperature is no more than 25 ℃, f 4=0;
When inflow temperature surpasses 25 ℃, f 4=0.15
For f 5, when 15 ℃≤△ of degree of superheat T≤25 ℃, f 5=0;
When 25 ℃ of < △ T≤30 of the degree of superheat ℃, f 5=0.05;
When 30 ℃ of > △ T of the degree of superheat, f 5=0.1;
For f 6, f 6 = - 1 125 * D + 8 25 ;
Wherein D is copper plate thickness, 15 mm≤D≤40 mm;
5), according to the water yield of every backwater branch road calculating, by controlling pneumatic diaphragm control valve, the control to the water yield while realizing cast.
The present invention adopts technique scheme, have the following advantages: adopt the collection to water inlet and return water temperature, control to each branch road water yield of backwater simultaneously, according to factors such as steel grade, pulling rate, inflow temperature, water inlet and backwater temperature difference, molten steel overheat, casting blank cross-section sizes, calculate outer arc, left and right sides cooling water inflow in crystallizer, the PID that realizes the water yield by electromagnetic flowmeter and pneumatic control valve regulates.During cast, improve the heat transfer of strand, reduced the incidence of blemish.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is system diagram of the present invention.
Fig. 2 is the cc billet surface quality figure of embodiment 2.
Fig. 3 is the cc billet surface quality figure of comparative example.
In figure, 1, water inlet main line; 2, the first temperature sensor; 3, inner arc backwater branch road; 4, outer arc backwater branch road; 5, left side backwater branch road; 6, right side backwater branch road; 7, the second temperature sensor; 8, electromagnetic flowmeter; 9, pneumatic diaphragm control valve; 10, continuous cast mold.
The specific embodiment
Below in conjunction with drawings and Examples, further a kind of crystallizer cooling water control device and method are described in detail.
Embodiment 1
A kind of crystallizer cooling water control device and method as shown in Figure 1, a kind of crystallizer cooling water control device, comprise continuous cast mold 10, the arrival end of this continuous cast mold 10 is connected with into water main line 1, and the inner arc of described continuous cast mold 10, outer arc, left side, right side connect respectively inner arc backwater branch road 3, outer arc backwater branch road 4, left side backwater branch road 5, right side backwater branch road 6;
Described water inlet main line 1 is provided with the first temperature sensor 2 for detection of inflow temperature;
On described inner arc backwater branch road 3, outer arc backwater branch road 4, left side backwater branch road 5, right side backwater branch road 6, be equipped with successively respectively the second temperature sensor 7 for detection of each branch road return water temperature, add up the electromagnetic flowmeter 8 of each branch road circling water flow rate, pneumatic diaphragm control valve 9; The first temperature sensor 2 detects the temperature of water inlet, and the return water temperature that the second temperature sensor 7 detects after continuous cast mold 10, contrasts monitored temperature value, draws degree of superheat △ T; Control to the water yield when pneumatic diaphragm control valve 9 is controlled cast, whether electromagnetic flowmeter 8 is used for observing water consumption is the water yield needing.
In order to calculate accurately degree of superheat △ T, the main line 1 that therefore intakes is 4 water inlet branch roads, and with inner arc, outer arc, the left side of continuous cast mold 10, right side connects, and is all provided with the first temperature sensor 2 on each water inlet branch road respectively.
A crystallizer cooling water control method, according to following steps, carry out:
1), 4 water inlet branch roads on water inlet main line 1, be respectively inner arc, outer arc, the left side of continuous cast mold 10, supply water in right side, and the water temperature on 2 pairs of each water inlet branch roads of the first temperature sensor on Zhi Jinshui branch road is carried out record;
2), the second temperature sensor 7 detects after continuous cast mold 10, the temperature of inner arc backwater branch road 3, outer arc backwater branch road 4, left side backwater branch road 5,6 branch road backwater of right side backwater branch road;
3), the temperature that detects of temperature that the first temperature sensor 2 is detected and the second temperature sensor 7 contrasts, and calculates return water temperature and the inflow temperature degree of superheat △ T of backwater branch road;
4), according to following computing formula, calculate the water yield that backwater branch road needs;
Q＝Q min+f*ΔQ
Q max≤Q≤Q min
Q max＝10*A
Q min＝6*A
ΔQ＝Q max-Q min＝4*A
f＝f 1+f 2+f 3+f 4+f 5-f 6
In formula, Q is each backwater branch road water yield; Q maxfor each backwater branch road maximum amount of water, Q minfor each backwater branch road least quantity; A is crystallizer inner arc, outer arc, left side or right side copper coin water seam cross-sectional area; F is comprehensive correction factor; f 1for pulling rate correction factor; f 2for steel grade correction factor; f 3for strand flakiness ratio correction factor; f 4for inflow temperature correction factor; f 5for molten steel overheat correction factor; f 6for copper coin is shaped correction factor;
In formula,
0≤f≤1
For f 1, when pulling rate 0≤v≤2m/min, f 1=0.1*v;
When pulling rate v > 2m/min, f 1=0.2
Wherein v is pulling rate, and unit is m/min;
For f 2,value is 01～0.4:
Following table is the different f of different steel grades 2value
Steel grade Correction factor f 2
Ultra-low-carbon steel 0.4
Mild steel 0.3
Peritectic steel, low-alloy steel 0～0.15
Medium carbon steel 0.2～0.3
High-carbon steel, steel alloy 0.1～0.2
For f 3, work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.1; Work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.05;
For f 4, when inflow temperature is no more than 25 ℃, f 4=0;
When inflow temperature surpasses 25 ℃, f 4=0.15
For f 5, when 15 ℃≤△ of degree of superheat T≤25 ℃, f 5=0;
When 25 ℃ of < △ T≤30 of the degree of superheat ℃, f 5=0.05;
When 30 ℃ of > △ T of the degree of superheat, f 5=0.1;
For f 6, f 6 = - 1 125 * D + 8 25 ;
Wherein D is copper plate thickness, 15 mm≤D≤40 mm.
5), according to the water yield of every the backwater branch road calculating, by controlling pneumatic diaphragm control valve (9), realization is the control to the water yield to when cast, when water injection rate is watered in control, whether the data of observing the demonstration of electromagnetic flowmeter 8 are constantly the data that calculate, if not, adjust in time pneumatic diaphragm control valve 9, make the water yield reach the value of calculating.
Embodiment 2
Based on said apparatus and method, concrete is described these apparatus and method:
1) selecting cast casting blank section is 350mmX2100mm, steel grade Q460C, degree of superheat △ T is that 30 ℃, pulling rate are 0.6～0.8m/min, concrete value is 0.7 m/min, and by the first temperature sensor 2, recording crystallizer inflow temperature is that 35 ℃, copper plate thickness are 40mm.
2) when cast, according to step 4) in formula calculate the water yield of each branch road, be specially:
Determine f 1,f 2,f 3,f 4,f 5,f 6value:
F 1for when pulling rate 0≤v≤2m/min, f 1=0.1*v=0.1*0.7=0.07;
The steel grade that cause is got is Q460C, therefore f 2=0.15
Strand while therefore calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.1;
Because of the first temperature sensor 2, recording crystallizer inflow temperature is 35 ℃, so f 4=0.15,
Degree of superheat △ T is 30 ℃, f 5=0.05;
f 6 = - 1 125 * D + 8 25 = 1 125 * 40 + 8 25 = 0.64 ;
According to data above, determine f and according to backwater branch road maximum amount of water, backwater branch road least quantity, crystallizer inner arc, outer arc, left side or right side copper coin water seam cross-sectional area, draw the water yield of each following backwater branch road:
Inner arc backwater branch road 3 water yields and outer arc backwater branch road 4 water yields are equal, and adjustable range is: 4200 l/min～4650 l/mim;
Left side backwater branch road 5 water yields and right side backwater branch road 6 water yields are equal, and adjustable range is: 600 l/min～680 l/mim.
According to the water yield that calculates each backwater branch road, by controlling pneumatic diaphragm control valve 9, regulate the water yield of each backwater branch road, make it reach the water yield of calculating;
Maybe, by the water yield of calculating, pass in real time PLC control system, the PID water yield that realizes 9 of electromagnetic flowmeter 8 and pneumatic diaphragm control valves by PLC regulates.
Comparative example
The cast of embodiment 2 is not adopted to the real-time dynamic adjustments crystallizer water yield, is described below:
1) selecting cast casting blank section is 350mmX2100mm, steel grade Q460C, and the degree of superheat is that 30 ℃, pulling rate are 0.6～0.8m/min, by temperature sensor 2, to record crystallizer inflow temperature be that 35 ℃, copper plate thickness are 40mm.
2), while pouring into a mould, two-level computer system is set a fixing water yield, is specially:
Inner arc backwater branch road 3 water yields and outer arc backwater branch road 4 water yields equate, are set as: 4550 l/min
Left side backwater branch road 5 water yields and right side backwater branch road 6 water yields equate, are set as: 655l/min
By the water yield of setting, pass to PLC control system, the PID water yield that realizes 9 of electromagnetic flowmeter 8 and pneumatic diaphragm control valves by PLC regulates.
With reference to Fig. 2, Fig. 3, as can be seen from Figure 2, implement after crystallizer water yield dynamic adjustments, strand has been avoided the generation of crackle, as can be seen from Figure 3, does not implement after crystallizer water yield dynamic adjustments, there is crackle in strand, by contrast, draw, the present invention has avoided or has reduced the generation of slab surface crack, has improved cc billet surface quality.
More than exemplifying is only to illustrate of the present invention, does not form the restriction to protection scope of the present invention, within the every and same or analogous design of the present invention all belongs to protection scope of the present invention.

Claims (3)

1. a crystallizer cooling water control device, comprise continuous cast mold (10), the arrival end of this continuous cast mold (10) is connected with into water main line (1), it is characterized in that, the inner arc of described continuous cast mold (10), outer arc, left side, right side connect respectively inner arc backwater branch road (3), outer arc backwater branch road (4), left side backwater branch road (5), right side backwater branch road (6);
Described water inlet main line (1) is provided with the first temperature sensor (2) for detection of inflow temperature;
On described inner arc backwater branch road (3), outer arc backwater branch road (4), left side backwater branch road (5), right side backwater branch road (6), be respectively equipped with the second temperature sensor (7) for detection of each branch road return water temperature, add up the electromagnetic flowmeter (8) of each branch road circling water flow rate, pneumatic diaphragm control valve (9).
2. a kind of crystallizer cooling water control device according to claim 1, it is characterized in that, described water inlet main line (1) is 4 water inlet branch roads, respectively with inner arc, outer arc, the left side of continuous cast mold (10), right side connects, and is all provided with the first temperature sensor (2) on each water inlet branch road.
3. a crystallizer cooling water control method, is characterized in that, according to following steps, carries out:
1), 4 water inlet branch roads on water inlet main line (1), be respectively inner arc, outer arc, the left side of continuous cast mold (10), supply water in right side, and the first temperature sensor (2) on Zhi Jinshui branch road carries out record to the water temperature on each water inlet branch road;
2), the second temperature sensor (7) detects after continuous cast mold (10), the temperature of inner arc backwater branch road (3), outer arc backwater branch road (4), left side backwater branch road (5), each branch road backwater of right side backwater branch road (6);
3), the temperature that detects of temperature that the first temperature sensor (2) is detected and the second temperature sensor (7) contrasts, and calculates return water temperature and the inflow temperature degree of superheat △ T of backwater branch road;
4), according to following computing formula, calculate the water yield that backwater branch road needs;
Q＝Q min+f*ΔQ
Q max≤Q≤Q min
Q max＝10*A
Q min＝6*A
ΔQ＝Q max-Q min＝4*A
f＝f 1+f 2+f 3+f 4+f 5-f 6
In formula, Q is each backwater branch road water yield; Q maxfor each backwater branch road maximum amount of water, Q minfor each backwater branch road least quantity; A is crystallizer inner arc, outer arc, left side or right side copper coin water seam cross-sectional area; F is comprehensive correction factor; f 1for pulling rate correction factor; f 2for steel grade correction factor; f 3for strand flakiness ratio correction factor; f 4for inflow temperature correction factor; f 5for molten steel overheat correction factor; f 6for copper coin is shaped correction factor;
In formula,
0≤f≤1
For f 1, when pulling rate 0≤v≤2m/min, f 1=0.1*v;
When pulling rate v > 2m/min, f 1=0.2
Wherein v is pulling rate, and unit is m/min;
For f 2,value is 01～0.4:
For f 3, work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.1; Work as strand while calculating inner arc and the outer arc backwater branch road water yield, f 3=0.15, while calculating left side and the right side backwater branch road water yield, f 3=0.05;
For f 4, when inflow temperature is no more than 25 ℃, f 4=0;
When inflow temperature surpasses 25 ℃, f 4=0.15
For f 5, when 15 ℃≤△ of degree of superheat T≤25 ℃, f 5=0;
When 25 ℃ of < △ T≤30 of the degree of superheat ℃, f 5=0.05;
When 30 ℃ of > △ T of the degree of superheat, f 5=0.1;
For f 6, f 6 = - 1 125 * D + 8 25 ;
Wherein D is copper plate thickness, 15 mm≤D≤40 mm.
5), according to the water yield of every backwater branch road calculating, by controlling pneumatic diaphragm control valve (9), the control to the water yield while realizing cast.
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CN104084553A (en) * 2014-07-24 2014-10-08 山西太钢不锈钢股份有限公司 Automatic adjusting system for continuous crystallizer soft water
CN105436440A (en) * 2016-01-19 2016-03-30 中国重型机械研究院股份公司 Hydraulic vibration water way structure with production of different continuous cast billets combined and cooling method
CN107052294A (en) * 2017-05-26 2017-08-18 江苏省沙钢钢铁研究院有限公司 A kind of method for reducing low-carbon boron-containing steel small billet corner crack
CN109014102A (en) * 2018-09-21 2018-12-18 中冶赛迪工程技术股份有限公司 High pulling rate medium and thin slab continuous caster secondary cooling method
CN109332614A (en) * 2018-11-12 2019-02-15 莱芜钢铁集团银山型钢有限公司 A kind of non-equilibrium casting beam blank mould cooling controller of single-point and control method
CN109434048A (en) * 2018-12-28 2019-03-08 西安科唯电热科技有限公司 A kind of crystallizer cooling device and its cooling means
CN110576160A (en) * 2019-09-26 2019-12-17 中冶赛迪工程技术股份有限公司 control system and method for crystallizer water of continuous casting machine
CN110666126A (en) * 2019-10-09 2020-01-10 中国重型机械研究院股份公司 System and method for stabilizing convection heat exchange coefficient of crystallizer copper plate cooling water
CN114226673A (en) * 2021-11-22 2022-03-25 中冶赛迪技术研究中心有限公司 Temperature control method of cooling water of continuous casting crystallizer, storage medium and electronic terminal
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CN105436440A (en) * 2016-01-19 2016-03-30 中国重型机械研究院股份公司 Hydraulic vibration water way structure with production of different continuous cast billets combined and cooling method
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