CN107052061A - A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation - Google Patents
A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation Download PDFInfo
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- CN107052061A CN107052061A CN201710461402.5A CN201710461402A CN107052061A CN 107052061 A CN107052061 A CN 107052061A CN 201710461402 A CN201710461402 A CN 201710461402A CN 107052061 A CN107052061 A CN 107052061A
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- water
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- cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
Abstract
The present invention is a kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation, by considering pace of the steel plate in section cooling, according to certain cycle period, dynamic detection steel billet temperature, and the flow of the cooling water according to required for being calculated the temperature dynamic of newest detection, " the valve group number N of opening degree 100% " and the valve openings degre K of last group of flow control valve are then determined according to the flow（0≤K≤1）, and the time delay Δ t that flow is adjusted is determined according to valve group number.Present invention can ensure that temperature is identical after steel plate is cooled down end to end, it is ensured that the homogeneity of properties of product, it is to avoid occur that head performance is qualified, afterbody performance is unqualified, or afterbody performance is qualified, head performance underproof situation, and quality objection is avoided as possible.
Description
Technical field
The present invention relates to a kind of cooling water inflow adjusting method of field of metallurgy, specifically in cut deal and Wide and Thick Slab
In laminar cooling process, for steel plate end to end the set presence of temperature deviation and the targetedly consideration head and tail temperature that carries out is inclined
The water dynamic regulating method of the section cooling of difference.
Background technology
After the completion of the rolling of cut deal and Wide and Thick Slab, most of steel grade needs to carry out section cooling, to improve steel plate
Performance.It is as shown in Figure 1 steel plate section cooling schematic diagram, what square frame circle was lived in figure is set to section cooling region.Steel plate is set in addition
Direction of advance, end is A, and opposite ends are B.If two adjacent valve gate-to-gate distances are S.If target chilling temperature is Tt(here for
Avoid remembering various symbols, convenient to understand, it is to illustrate exemplified by 700 DEG C directly to assume target chilling temperature).
It is usually the temperature at the steel plate A measured according to temperature measurer in traditional automatic computation model of section cooling flow
(it is set to TA), 700 DEG C of combining target temperature is directly calculated, it is assumed here that result of calculation is needs 5 groups of water to open, then according to biography
System computation model, the steel plate terminates since cooling to cooling, and logical plate is all using 5 groups of water coolings.
But in above-mentioned setting, one problem of physical presence, i.e. steel plate side a and b (set its temperature as TB) enter laminar flow
Temperature during cooled region is simultaneously differed.And according to actually detected, in the case of steel plate is longer, both temperature differences can reach
To 80 DEG C, in this case, if head A and tail B are using 5 groups of water coolings, hence it is evident that improper, it is easily caused end to end that performance is not
Equal phenomenon, adds the possibility for quality accident occur.
The content of the invention
The technical problems to be solved by the invention are：Temperature is identical after the guarantee steel plate that how can try one's best is cooled down end to end, it is ensured that
The homogeneity of properties of product, it is to avoid occur that head performance is qualified, afterbody performance is unqualified, or afterbody performance is qualified, head
Performance underproof situation, avoids quality objection as possible.
The present invention solve above technical problem technical scheme be：
A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation, laminar flow is cold
But region is interval with coolant valve on steel plate traffic direction and is connected with cooling water pipe, section cooling area enter in steel plate one
End is provided with temperature measurer, comprises the following steps：
(i) steel plate pace V and steel plate total length L are read, V unit is m/s, and L unit is m；
(2) unit for calculating water dynamic adjustment cycle period C, C=1/V, C is s, calculates total adjustment times N umber,
Number=L, wherein L round numbers；
(iii) when the end A of steel plate enters section cooling area, according at the beginning of the initial temperature T that the temperature measurer is detected and mesh
(target temperature is the temperature that steel plate cooling is wished to reach to mark temperature Tt, such as 900 DEG C of temperature before steel plate cooling, it is desirable to be cooled to
700 DEG C, then target temperature is 700 DEG C), initial flow VOL (A) is calculated, is specially：
(1) according to formula CSteelmSteelΔTSteel=CWatermWaterΔTWaterObtain the quality m of waterWater, wherein CSteelIt is the specific heat of steel, CWaterIt is water
Specific heat, mSteelIt is the quality of steel plate, Δ TSteelIt is the temperature drop of steel plate, Δ TSteel=T-Tt, Δ TWaterIt is the temperature rise Δ T of cooling waterWater=T2-T1,
T2It is the final temperature of cooling water, T1It is the initial temperature of cooling water；
(2) it is target cooldown rate to obtain target cool time t, wherein Vt according to formula t=(T-Tt)/Vt；
(3) according to formula VOL (A)=mWater/ t obtains initial flow VOL (A)；
Then according to formula (1)：
VOL (A)=NF max+kF max (1)
N and K is calculated, wherein N is " the valve group number of opening degree 100% ", the opening of last group of flow control valve of K
Degree, 0≤K≤1, Fmax is the maximum stream flow of each coolant valve (assuming that VOL (A) is 2000L/s, it is assumed that each valve is maximum
Flow is 300L/s, then 2000/300, round N is 6, remainder is about 0.667, then 0.667) K is；
Then according to N and K combinations formula (2)：
Calculate cooling range total length SAlways, middle S is the distance between two neighboring cooling nozzles altogether, and unit is m；
Finally according to target cool time t, the pace V=S for the steel plate askedAlways/ t, directly passes to N, K and V
PLC, opens related valve, starts the cooling that discharges water, and now counter records adjustment number of times m is 0；
(iv) after C, (C units are s, as described in step 2.Delay C refers to every C seconds according to newest detection temperature herein
Degree, calculates once newest flow, and it is equal to calculates once newest flow every 1 meter of steel plate according to newest detection temperature),
Allow adjustment number of times m plus 1, examine whether m exceedes total adjustment number of times, if it exceeds then enter step (vi), if not above entering
Step is (v)；
(v) temperature measurer measures newest temperature TNewly, according to TNewlyAnd target chilling temperature, calculate VOL (m), VOL (m) calculating
(iii) identical with step, according to VOL (m) and formula (1), the calculating for calculating N and K, N and K is (iii) identical with step, according to formula (2)
Calculate SAlways, according to formula (3)：
Computing relay time Δ t, issues PLC execution, then while will calculate obtained N, K and postpone execution time Δ t
Circulated into step 4；
(vi) adjustment is completed.
The present invention relates to formula explanation：
The segmentation of steel plate and the definition of water regulating valve：
Since the A of end, afterwards every 1 meter point one section of steel plate (set node difference corresponding A 1, A2, A3 ...).If steel plate advances
Speed be V, A enter section cooling when temperature be TA, the moment be t0, section cooling model is according to TAThe stream of the cooling water of calculating
It is F to measure as VOL (A), the maximum turn-on flow rate of every group of valvemax, then there is following formula establishment,
VOL (A)=NF max+kF max (1)
In formula, N be " the valve group number of opening degree 100% ", the opening degree of last group of flow control valve of K, 0≤K≤
1, Fmax is the maximum stream flow of each coolant valve.The implication of above formula is, flow VOL (A) always can by some groups of valves with
100% opening degree is opened, last additionally to be formed by a valve appropriateness opening.Here last valve moderately opened is set
For water regulating valve, as shown in Figure 2.
The time adjustment of water regulating valve：
As shown in Figure 2, any point (such as A1 points) on steel plate, since the point is into section cooling, the point reaches " water
Untill during adjustable valve ", the required time is set to Δ t, then has
If any point Ai on steel plate, the point is reached under temperature measurer, and we can write down the temperature Ti of the point, if laminar flow is cold
But model is VOL (i) according to the flow of the Ti cooling waters calculated, then in actual production, after we postpone Δ t seconds, then Ai points are firm
Reach under water regulating valve well, this when, we began through control valve execution VOL (i) flow.
Further, since flow adjustment needs the regular hour, therefore, the dynamic adjustment of flow must be according to certain cycle
Carry out, be here that interval is carried out with 1 meter.Since A points, the record time interval of A1, A2, A3 ... each point, namely record period C
For,
If steel plate total length is L meters, then total adjustment times N umber is：
Number=L (rounding) (5)
The beneficial effects of the invention are as follows：During cut deal and Plate rolling, due to natural characteristic, head and afterbody
Temperature certainly exists difference, and sometimes deviation is larger, or even can reach more than 80 DEG C, and the present invention can effectively consider that steel plate enters
Coolant-temperature gage changes the influence to cooling, dynamically enters coolant-temperature gage regulating pondage according to steel plate, really inherently ensures steel plate head
Temperature is identical after tail cooling, it is ensured that the homogeneity of product entire body performance, is conducive to avoiding the generation of quality accident.
Brief description of the drawings
The existing steel plate section cooling schematic diagrames of Fig. 1.
Fig. 2 is the steel plate section cooling schematic diagram of the present invention.
Fig. 3 is the flow chart of water dynamic regulating method of the present invention.
Embodiment
Embodiment 1
The present embodiment is a kind of water dynamic regulation for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation
Method, section cooling region is interval with coolant valve on steel plate traffic direction and is connected with cooling water pipe, and section cooling area exists
One end that steel plate enters is provided with temperature measurer, and this method comprises the following steps：
(i) steel plate pace V and steel plate total length L are read, V unit is m/s, and L unit is m；
(2) unit for calculating water dynamic adjustment cycle period C, C=1/V, C is s, calculates total adjustment times N umber,
Number=L, wherein L round numbers；
(iii) when the end A of steel plate enters section cooling area, according at the beginning of the initial temperature T that the temperature measurer is detected and mesh
(target temperature is the temperature that steel plate cooling is wished to reach to mark temperature Tt, such as 900 DEG C of temperature before steel plate cooling, it is desirable to be cooled to
700 DEG C, then target temperature is 700 DEG C), initial flow VOL (A) is calculated, is specially：
(1) according to formula CSteelmSteelΔTSteel=CWatermWaterΔTWaterObtain the quality m of waterWater, wherein CSteelIt is the specific heat of steel, CWaterIt is water
Specific heat, mSteelIt is the quality of steel plate, Δ TSteelIt is the temperature drop of steel plate, Δ TSteel=T-Tt, Δ TWaterIt is the temperature rise Δ T of cooling waterWater=T2-T1,
T2It is the final temperature of cooling water, T1It is the initial temperature of cooling water；
(2) it is target cooldown rate to obtain target cool time t, wherein Vt according to formula t=(T-Tt)/Vt；
(3) according to formula VOL (A)=mWater/ t obtains initial flow VOL (A)；
Then according to formula (1)：
VOL (A)=NF max+kF max (1)
N and K is calculated, wherein N is " the valve group number of opening degree 100% ", the opening of last group of flow control valve of K
Degree, 0≤K≤1, Fmax is the maximum stream flow of each coolant valve (assuming that VOL (A) is 2000L/s, it is assumed that each valve is maximum
Flow is 300L/s, then 2000/300, round N is 6, remainder is about 0.667, then 0.667) K is；
Then according to N and K combinations formula (2)：
Calculate cooling range total length SAlways, middle S is the distance between two neighboring cooling nozzles altogether, and unit is m；
Finally according to target cool time t, the pace V=S for the steel plate askedAlways/ t, directly passes to N, K and V
PLC, opens related valve, starts the cooling that discharges water, and now counter records adjustment number of times m is 0；
(iv) after C, (C units are s, as described in step 2.Delay C refers to every C seconds according to newest detection temperature herein
Degree, calculates once newest flow, and it is equal to calculates once newest flow every 1 meter of steel plate according to newest detection temperature),
Allow adjustment number of times m plus 1, examine whether m exceedes total adjustment number of times, if it exceeds then enter step (vi), if not above entering
Step is (v)；
(v) temperature measurer measures newest temperature TNewly, according to TNewlyAnd target chilling temperature, calculate VOL (m), VOL (m) calculating
(iii) identical with step, according to VOL (m) and formula (1), the calculating for calculating N and K, N and K is (iii) identical with step, according to formula (2)
Calculate SAlways, according to formula (3)：
Computing relay time Δ t, issues PLC execution, then while will calculate obtained N, K and postpone execution time Δ t
Circulated into step 4；
(vi) adjustment is completed.
Assuming that 20 tons of certain steel plate, long 20 meters, it is 900 DEG C, target temperature 700 that steel plate head, which enters section cooling initial temperature,
DEG C, in order to reach structure property requirement, technological requirement steel plate cooldown rate reaches 20 DEG C/s, and temperature measurer shows water in cooling tower
30 DEG C of temperature, 50 DEG C of water temperature after cooling, every group of water valve maximum stream flow 300L/s is 1.1 meters per distance between two adjacent groups valve, then
According to CSteelmSteelΔTSteel=CWatermWaterΔTWater has, when steel plate head enters cooling water, initial water-carrying capacity is,
0.46×103× 20000 × (900-700)=4.2 × 103×mWater×(50-30) (4)
So m can be obtainedWater=21905kg
Cool time t is (900-700)/20=10s
So cooling water initial flow rate VOL (A)=2190.5L/s
So valve N=2190.5/300=7 (rounds) K=(2190.5-300 × 7)/300=0.3
So cooled region total length is 7 × 1.1=7.7 meters
So steel plate pace is：4.2/10=0.77 rice/s
Certainly, in practical application, because vapor can take away larger a part of heat, institute's general meeting in (4) left side in equation
A self study coefficient is multiplied by, I will not elaborate.
Then, steel plate often advances one meter, then corrects a N and K again, and postpone corresponding time execution.
In addition to the implementation, the present invention can also have other embodiment.All use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domain of application claims.
Claims (3)
1. a kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation, the laminar flow
Cooled region is interval with coolant valve on steel plate traffic direction and is connected with cooling water pipe, and the section cooling area is entered in steel plate
The one end entered is provided with temperature measurer, it is characterised in that：Comprise the following steps：
(i) steel plate pace V and steel plate total length L are read；
(2) water dynamically adjustment cycle period C, C=1/V is calculated；Calculate total adjustment times N umber, Number=L, wherein L
Round numbers；
(iii) when the end A of steel plate enters section cooling area, according at the beginning of the initial temperature T that the temperature measurer is detected and target temperature
Tt is spent, initial flow VOL (A) is calculated, is specially：
(1) according to formula CSteelmSteelΔTSteel=CWatermWaterΔTWaterObtain the quality m of waterWater, wherein CSteelIt is the specific heat of steel, CWaterIt is the specific heat of water,
mSteelIt is the quality of steel plate, Δ TSteelIt is the temperature drop of steel plate, Δ TSteel=T-Tt, Δ TWaterIt is the temperature rise Δ T of cooling waterWater=T2-T1, T2It is
The final temperature of cooling water, T1It is the initial temperature of cooling water；
(2) it is target cooldown rate to obtain target cool time t, wherein Vt according to formula t=(T-Tt)/Vt；
(3) according to formula VOL (A)=mWater/ t obtains initial flow VOL (A)；
Then according to formula (1)：
VOL (A)=NF max+kF max (1)
Calculate N and K, wherein N be " the valve group number of opening degree 100% ", the opening degree of last group of flow control valve of K, 0≤
K≤1, Fmax is the maximum stream flow of each coolant valve；
Then according to N and K combinations formula (2)：
Calculate cooling range total length SAlways, middle S is the distance between two neighboring cooling nozzles altogether, and unit is m；
Finally according to target cool time t, the pace V=S for the steel plate askedAlways/ t, directly passes to PLC by N, K and V, opens
Related valve is opened, starts the cooling that discharges water, now counter records adjustment number of times m is 0；
(iv) after C, allow adjustment number of times m plus 1, examine whether m exceedes total adjustment number of times, if it exceeds then entering step (vi), such as
Fruit is not above then into step (v)；
(v) temperature measurer measures newest temperature TNewly, according to TNewlyAnd target chilling temperature, calculate VOL (m), VOL (m) calculating and step
Rapid (iii) identical, according to VOL (m) and formula (1), the calculating for calculating N and K, N and K is (iii) identical with step, is calculated according to formula (2)
SAlways, according to formula (3)：
Computing relay time Δ t, PLC execution is issued while will calculate obtained N, K and postpone execution time Δ t, subsequently into
Step 4 is circulated；
(vi) adjustment is completed.
2. the cut deal of head and tail temperature deviation and the water dynamic regulation of Wide and Thick Slab section cooling are considered as claimed in claim 1
Method, it is characterised in that：The unit of the V is m/s, and L unit is m.
3. the cut deal of head and tail temperature deviation and the water dynamic regulation of Wide and Thick Slab section cooling are considered as claimed in claim 1
Method, it is characterised in that：The unit of the C is s.
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| CN201710461402.5A CN107052061A (en) | 2017-06-16 | 2017-06-16 | A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation |
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| CN201710461402.5A CN107052061A (en) | 2017-06-16 | 2017-06-16 | A kind of water dynamic regulating method for the cut deal and Wide and Thick Slab section cooling for considering head and tail temperature deviation |
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| CN107655151A (en) * | 2017-10-10 | 2018-02-02 | 天津大学 | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing |
| CN108097728A (en) * | 2017-12-15 | 2018-06-01 | 二重（德阳）重型装备有限公司 | The control method of base cooling water inflow among aluminium alloy |
| CN110814053A (en) * | 2019-11-15 | 2020-02-21 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial and error method |
| CN111093850A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Cooling device and cooling method for steel material |
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2017
- 2017-06-16 CN CN201710461402.5A patent/CN107052061A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111093850A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Cooling device and cooling method for steel material |
| CN107655151A (en) * | 2017-10-10 | 2018-02-02 | 天津大学 | A kind of air-conditioner water system feedforward control time computational methods transmitted based on flowing |
| CN108097728A (en) * | 2017-12-15 | 2018-06-01 | 二重（德阳）重型装备有限公司 | The control method of base cooling water inflow among aluminium alloy |
| CN108097728B (en) * | 2017-12-15 | 2019-03-19 | 二重（德阳）重型装备有限公司 | The control method of base cooling water inflow among aluminium alloy |
| CN110814053A (en) * | 2019-11-15 | 2020-02-21 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial and error method |
| CN110814053B (en) * | 2019-11-15 | 2021-04-20 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial and error method |
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