CN101642780A - Intermediate blank cooling system and cooling control technology - Google Patents
Intermediate blank cooling system and cooling control technology Download PDFInfo
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- CN101642780A CN101642780A CN200910104025A CN200910104025A CN101642780A CN 101642780 A CN101642780 A CN 101642780A CN 200910104025 A CN200910104025 A CN 200910104025A CN 200910104025 A CN200910104025 A CN 200910104025A CN 101642780 A CN101642780 A CN 101642780A
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Abstract
The invention belongs to the metallurgy technical field and in particular relates to an intermediate blank cooling system and cooling control technology. The intermediate blank cooling system is characterized in that an aerial fog cooling device body is arranged between a rough mill and a finishing mill. The aerial fog cooling device body is composed of an upper cooling header and a lower coolingheader, and an aerial fog nozzle and a compression air pipe are arranged on the cooling water pipe of the upper cooling header and the lower cooling header; and the on/off control valve and flow control valve of the cooling water pipe and the compression air pipe are connected with a control valve station. The intermediate blank aerial fog cooling technology is controlled by the aerial fog controltechnology sprayed on the cooling header arranged near roller ways at the front and rear of the mills. The invention has fast cooling speed without changing metal performance, water yield regulatingrange is wide and the water yield can be regulated continuously, the cooling speed of the intermediate blank can be precisely controlled, and the invention can be widely applicable to middle and thickplate production line.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of intermediate blank cooling system and cooling control technology.
Background technology
The Heavy Plate Production line has generally adopted thermal mechanical rolling technology (TMCP) to produce high-grade cut deal both at home and abroad at present, and the advantage of this technology is the cost that has reduced high-grade product, and obtains the good product of intensity high-performance.Owing to need to control the rolling temperature of intermediate blank in the operation of rolling, it is rolling that promptly the intermediate blank temperature that must reach regulation is just carried out second stage or phase III.Present Heavy Plate Production line substantially all adopts the cold mode of the enterprising line space of roller-way before and after milling train, and the time of cooling is longer, and the time of cooling is generally 3～12 minutes according to kind and thickness difference, even longer.In order to improve output, all adopt polylith rolling at present, but this rolling mode, the organization of production difficulty is big, and the rhythm matching difficulty of milling train is very big.See that totally this rolling mode can reduce milling train hourly output 30～50%.
The intermediate blank of present domestic employing control cooling technology mainly contains laminar flow cooling or two kinds of forms of cascade, and the cooling technology of these two kinds of forms is used for seeing and all has different problems from actual making.Control cooling system in the middle of the laminar flow methods for cooling, because its water yield is excessive, cooling velocity is bigger than normal, and the structure property of intermediate blank is all brought adverse influence.Control cooling system in the middle of the cascade form, owing to the water yield can not be adjusted as required automatically, and inhomogeneous cooling is even, and causes the temperature difference of intermediate blank to strengthen, and can not satisfy the needs of production technology.
Because the problems referred to above that cooling technology exists in the middle of existing, so this control cooling technology is the main cause that does not also generally adopt at present, domestic have only few Heavy Plate Production lines such as Baosteel, Ji steel to adopt, and result of use is not ideal.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, first purpose is to provide a kind of intermediate blank cooling system, and second purpose is to provide a kind of cooling control technology of intermediate blank cooling system.Cooling velocity of the present invention is fast, but does not change metallicity, and the adjustable range of the water yield is big, and the water yield can regulate continuously, can control the cooling velocity of intermediate blank accurately, can be widely used in the Heavy Plate Production line.
First purpose of the present invention is achieved through the following technical solutions: a kind of intermediate blank cooling system is characterized in that: between roughing mill and finishing mill, aerosol cooling device body is set.Described aerosol cooling device body is made up of top cooling manifold and bottom cooling manifold, and aerial fog nozzle and compressed air hose are installed on the cooling water pipe of top cooling manifold and bottom cooling manifold; The open and close control valve of cooling water pipe and compressed air hose is connected with the control valve station with flow control valve.
The independent respectively control of aerosol cooling manifold up and down, the water yield can be adjusted separately continuously.
For ease of the maintenance of equipment with to the protection of upper header, described aerosol cooling upper header is fixedlyed connected with the hydraulic pressure tipple.
Be to remove the residual water of intermediate blank upper surface, or/and the exit is provided with blow device, this device is conventional equipment at the inlet of this system, and it utilizes compressed air to remove the residual water of intermediate blank upper surface.
Extract out outside the factory building for the steam that will produce owing to cooling, this system also comprises vapor extraction device, and this vapor extraction device is made up of conventional equipments such as draft hood, exhaust tube, blast pipe, blower fan and steel construction bracing frames.
For draft hood can independently be moved by crane, therefore take the segmented mode of drawing gas, the draft hood of described vapor extraction device is arranged on the described hydraulic pressure tipple, moves with the system of tumbling.Draft hood can be divided into three groups, and draft hood and tipple rotate together, and the angle of tumbling is to the maximum about 67 °.
For following the tracks of the position of intermediate blank, the entrance and exit place of this system is provided with pyrometer and position detector respectively, can not break away from the spraying cooling zone to guarantee that intermediate blank is swung on roller-way.
Second purpose of the present invention is achieved through the following technical solutions: a kind of intermediate blank cooling control technology, and it is characterized in that: cooling control technology may further comprise the steps:
1) sets the quantity that cooling manifold opens and closes by computer according to thickness, width, steel grade and the temperature of intermediate blank;
2) computer is according to thickness, width, steel grade and the temperature computation of intermediate blank and set cooling water inflow;
3) by computer operation relevant open and close control valve and flow-control valve events;
4) Xiang Guan cooling manifold begins spraying, end setup computational process, cooling intermediate blank;
5) temperature with intermediate blank feeds back to computer, and compares with predefined chilling temperature, and if any being higher than predefined chilling temperature, then repeating step 1)～4), the water yield adjusted, to improve the Cooling Control precision; As be not more than predefined chilling temperature, then enter next procedure.
For realizing intellectuality, make whole process for cooling can adjust the quantity of cooling water inflow and cooling manifold switching automatically according to the concrete condition of intermediate blank, further comprising the steps of in the step 5): computer is according to the intermediate blank feedback data, calculate cooling manifold opens and closes under the initial temperature state optimal number and best cooling water inflow, and be set at the default value of cooling next time.
In the whole technical process of intermediate blank cooling, intermediate blank preferably adopts the swing strategy, and the speed and the amplitude size of intermediate blank swing are manually set as required.
The invention has the beneficial effects as follows:
(1) cooling system involved in the present invention and cooling control technology can realize intermediate blank is adopted aerosol cooling control, so can cool off intermediate blank fast in the time about 2 minutes, but not change the metallicity of intermediate blank.
(2) cooling system involved in the present invention and cooling control technology, in reduction organization of production difficulty, it is about 20～30% to improve integrated production capacity, the economic benefit highly significant.
(3) the present invention adopts the aerosol cooling principle that intermediate blank is cooled off, the adjustable range of the water yield is big, the adjusting ratio of maximum amount of water and least quantity is 20 times, and the water yield can be regulated continuously, can control the cooling velocity of intermediate blank accurately, so can realize the cooling requirement of different temperatures, different steel grade, different in width, different-thickness intermediate blank, can be widely used in the Heavy Plate Production line.
(4) the present invention is provided with online control model, and possesses self-learning function, and is therefore simple to operate, and control accurately.
(5) cooling system involved in the present invention is provided with automatic steam bleeding system, and the steam that cools off is discharged into outside the factory building automatically, avoids steam to spread in the factory building, to operating the unfavorable electrical equipment of avoiding simultaneously influencing.
(6) since the draft hood segmentation arrange, therefore to the conveniently moving of draft hood, thereby be convenient to that roller-way is safeguarded and the inspection and the replacing of cooling jet.
Description of drawings
Fig. 1 is a system layout schematic diagram of the present invention;
Fig. 2 is a chiller system schematic diagram of the present invention;
Fig. 3 is the structural representation of aerosol cooling device of the present invention;
Fig. 4 is that the A of Fig. 3 is to view;
Fig. 5 is that the B of Fig. 3 is to view;
Fig. 6 is a cooling control process schematic representation of the present invention.
Among the figure, 1-blow device, 2-pyrometer, 3-top cooling manifold, 4-bottom cooling manifold, 5-cooling water pipe, the 6-aerial fog nozzle, 7-compressed air hose, 8-rollgang, 9-aerosol cooling device body, 10-position detector, 11-roughing mill, the 12-finishing mill, 13-vapor extraction cowl, 14-tipple, 15-control valve station, 16-vapor extraction device, 17-upper header framework.
The specific embodiment
The invention will be further described below in conjunction with concrete embodiment, but therefore do not limit the invention among the following concrete mode.
Shown in Fig. 1～5: between roughing mill 11 and finishing mill 12, aerosol cooling device body 9 is set, blow device 1, pyrometer 2 and position detector 10 is installed in its gateway.Aerosol cooling device body 9 is made up of top cooling manifold 3 and bottom cooling manifold 4, and top cooling manifold 3 is installed on the upper header framework 17, and bottom cooling manifold 4 is installed between the rollgang 8; Aerial fog nozzle 6 and compressed air hose 7 are installed on the cooling water pipe 5 of top cooling manifold 3 and bottom cooling manifold 4; The open and close control valve of cooling water pipe 5 and compressed air hose 7 is connected with control valve station 15 with flow control valve.
Above aerosol cooling device body 9 steam bleeding system is installed, vapor extraction cowl 13 segmentations are arranged, are installed on the hydraulic pressure tipple 14, and are connected with vapor extraction device 16 by discharge duct.Vapor extraction cowl 13 and tipple 14 rotate together, and the angle of tumbling is to the maximum about 67 °.
Intermediate blank by rollgang 8 comes out from roughing mill 11 by top cooling manifold 3 and the even water smoke cooling of bottom cooling manifold 4 ejections, is sent to finishing mill 12 then in aerosol cooling device body 9.
As shown in Figure 6: the cooling system control of this cooling control technology is worked according to the following steps:
1) computer at control valve station 15 is thickness, width, steel grade and the temperature of intermediate blank according to the PDI number of steel plate, sets the quantity that cooling manifold opens and closes, and opens/close cooling manifold;
2) computer is according to thickness, width, steel grade and the temperature computation of intermediate blank and set cooling water inflow;
3) by computer operation relevant open and close control valve and flow-control valve events, control Flow-rate adjustment valve opening;
4) Xiang Guan cooling manifold begins spraying, the cooling intermediate blank;
5) the cooled temperature detection value of intermediate blank is fed back to computer, by possessing the online control model of self-learning function, compare with predefined chilling temperature, as be higher than predefined chilling temperature, then repeating step 1)～4), the water yield adjusted; As be not more than predefined chilling temperature, then enter next procedure.
Computer calculates cooling manifold opens and closes under the initial temperature state optimal number and best cooling water inflow according to the intermediate blank feedback data, is set at the default value of cooling next time.
In the whole technical process of intermediate blank cooling, intermediate blank adopts the swing strategy, and the speed and the amplitude size of intermediate blank swing are manually set as required.
Spraying cooling is by to intermediate blank surface sprinkling mist, take away the heat on intermediate blank surface by the water smoke evaporation, the temperature on intermediate blank surface is lowered, thereby produce the temperature difference with the intermediate blank center, make intermediate blank produce heat transmission, along with water smoke constantly evaporates, the heat of intermediate blank constantly is pulled away, and the temperature of intermediate blank just lowers gradually.By control spray amount and spray time, just can realize quantitatively cooling.
The heat that the intermediate blank cooling need be taken away calculates as follows:
Intermediate blank initial temperature: T
1
Cooled temperature: T
2
The temperature difference: Δ T=T
1-T
2
Intermediate blank quality: m
1(g)
Intermediate blank specific heat: ρ
To be quality m
1Intermediate blank from temperature T
1Drop to T
2, the heat that need take away from intermediate blank is:
Q
1＝ρ×m
1×(T
1-T
2)
Cooling water inflow is pressed following calculating:
Suppose to take away Q
1Heat, need m
2Water evaporation (33 ℃ of water temperatures, water specific heat are 1):
The first step: m
2Water from 33 ℃ of heat Q that are warmed up to 100 ℃ of needs
2:
Q
2＝m
2×L×(100-33)
Second step: the m
2Water evaporate the heat Q that needs fully
3(the hydro-thermal enthalpy=540cal/g)
Q3＝m2×540
According to energy principle: Q
1=Q
2+ Q
3
The theoretical water that needs as can be known is: m
2=ρ * m
1* (T
1-T
2)/610
Cooling velocity of the present invention is fast, but does not change metallicity, and the adjustable range of the water yield is big, and the water yield can regulate continuously, can control the cooling velocity of intermediate blank accurately, can be widely used in the Heavy Plate Production line.
Claims (10)
1, a kind of intermediate blank cooling system is characterized in that: between roughing mill (11) and finishing mill (12), aerosol cooling device body (9) is set.
2, intermediate blank cooling system as claimed in claim 1, it is characterized in that: described aerosol cooling device body (9) is made up of top cooling manifold (3) and bottom cooling manifold (4), goes up at the cooling water pipe (5) of top cooling manifold (3) and bottom cooling manifold (4) aerial fog nozzle (6) and compressed air hose (7) are installed; The open and close control valve of cooling water pipe (5) and compressed air hose (7) is connected with control valve station (15) with flow control valve.
3, intermediate blank cooling system as claimed in claim 2 is characterized in that: top cooling manifold (3) is installed on the upper header framework (17), and bottom cooling manifold (4) is installed between the rollgang (8).
4, intermediate blank cooling system as claimed in claim 1 is characterized in that: blow device (1), top installation steam bleeding system are installed in described aerosol cooling device body (9) gateway.
5, intermediate blank cooling system as claimed in claim 4 is characterized in that: the vapor extraction cowl of described steam bleeding system (13) segmentation is arranged, is installed on the hydraulic pressure tipple (14), and is connected with vapor extraction device (16) by discharge duct.
6, intermediate blank cooling system as claimed in claim 5 is characterized in that: draft hood (13) and tipple (14) rotate together, and the angle of tumbling is to the maximum about 67 °.
7, intermediate blank cooling system as claimed in claim 1 is characterized in that: pyrometer (9) and position detector (10) are set respectively in the gateway of described aerosol cooling device body (9).
8, the cooling control technology of intermediate blank cooling system according to claim 1 is characterized in that: cooling control technology may further comprise the steps:
1) sets the quantity that cooling manifold opens and closes by computer according to thickness, width, steel grade and the temperature of intermediate blank;
2) computer is according to thickness, width, steel grade and the temperature computation of intermediate blank and set cooling water inflow;
3) by computer operation relevant open and close control valve and flow-control valve events;
4) Xiang Guan cooling manifold begins spraying, end setup computational process, cooling intermediate blank;
5) temperature with intermediate blank feeds back to computer, and compares with predefined chilling temperature, and if any being higher than predefined chilling temperature, then repeating step 1)～4), the water yield adjusted; As be not more than predefined chilling temperature, then enter next procedure.
9, as the cooling control technology of intermediate blank cooling system as described in the claim 8, it is characterized in that: further comprising the steps of in the step 5): computer is according to the intermediate blank feedback data, calculate cooling manifold opens and closes under the initial temperature state optimal number and best cooling water inflow, and be set at the default value of cooling next time.
10, as the cooling control technology of intermediate blank cooling system as described in the claim 8, it is characterized in that: in the whole technical process of intermediate blank cooling, intermediate blank adopts the swing strategy, and the speed and the amplitude size of intermediate blank swing are manually set as required.
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| CN2009101040255A CN101642780B (en) | 2009-06-05 | 2009-06-05 | Intermediate blank cooling system and cooling control technology |
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| CN101642780B CN101642780B (en) | 2012-05-23 |
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