CN102380597B - Method for controlling secondary cooling water spraying width during continuous casting of plate blank - Google Patents
Method for controlling secondary cooling water spraying width during continuous casting of plate blank Download PDFInfo
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- CN102380597B CN102380597B CN201110333405.3A CN201110333405A CN102380597B CN 102380597 B CN102380597 B CN 102380597B CN 201110333405 A CN201110333405 A CN 201110333405A CN 102380597 B CN102380597 B CN 102380597B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000498 cooling water Substances 0.000 title claims abstract description 17
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 238000005507 spraying Methods 0.000 title abstract 3
- 239000007921 spray Substances 0.000 claims abstract description 22
- 238000004088 simulation Methods 0.000 claims abstract description 18
- 238000007711 solidification Methods 0.000 claims abstract description 17
- 230000008023 solidification Effects 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000004484 Briquette Substances 0.000 claims description 4
- 238000003079 width control Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008140 language development Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Abstract
The invention discloses a method for controlling secondary cooling water spraying width during continuous casting of a plate blank, which comprises the following steps: firstly, setting a plurality of secondary cooling sections in front of a straightening region of the plate blank; secondly, establishing a two-dimensional solidification and heat transfer simulation model of the plate blank through a computer; thirdly, utilizing the two-dimensional solidification and heat transfer simulation model to adjust the lectotype and the arrangement of a spray nozzle at the middle part of the wide surface of the plate blank; fourthly, determining the reasonable lectotype and the arrangement of the spray nozzles at the side parts by processing through the computer; fifthly utilizing the simulation model to determine the temperature distribution of the plate blanks with various width specifications through calculation; and sixthly, utilizing the model to calculate the flow rate of cooling water of a loop of the spray nozzle loop at the side part, which is arranged in an open state, and implementing the strategic cooling according to the calculated flow rate of the cooling water so as to enable the temperature on the surface of the plate blank to be uniform and prevent the corner part from being super-cooled. In the method, the simulation model is utilized for calculating the result, the situation of enabling the temperature at the side or corner part of the plate blank in the straightening region to be kept away from a brittleness temperature range is taken as the target, and the open/close state of each spray nozzle loop at the side part can be accurately determined, thereby enabling the control of the secondary cooling water spraying width to be more accurate, preventing the corner part of the plate blank from being super-cooled and avoiding the generation of cracks.
Description
Technical field
The present invention relates to be applied to the direct casting forming field of metallurgical process ferrous materials and other metal material, be specifically related to a kind of method that two cold water spray width are controlled.Be applicable to all types of metal materials in the process of the continuous casting plate blank with crooked and aligning.
Background technology
In the production process of continuous casting plate blank, need to slab, carry out secondary to sprinkling on the surface of mat or compressed air and water mixing jetting cooling, i.e. so-called " two is cold ".Because the corner portion of slab is in Two-Dimensional Heat, cooling very fast, the complexity of heat exchange between cooling water and slab in addition, the slab transversely uniformity of temperature is difficult to guarantee, general slab corner portion temperature, lower than wide surface temperature, forms corner portion surfusion.This surfusion is easy to the brittleness temperature scope (being generally 700-900 ℃ for steel) that makes bight temperature enter slab, now aligns slab, is easy to make slab bight to produce transverse crack.Simultaneously because the slab of multiple width specifications need be produced on the equipment of same set of continuous casting plate blank, so urgent need will solve suitable water spray width control problem, so that slab corner portion temperature is avoided brittleness temperature scope.
The main method solving is at present to adopt limit portion nozzle loop can " be opened " separately or the regulating system of " pass ", but not having all the time so far a kind of theoretical method to instruct should be in " opening " or "off" state in the following portion's nozzle of which kind of situation loop, and should there be great cooling water flow in the nozzle loop of "On" state, and experience is determined artificially.Therefore, seek a set of two cold water spray width control methods with theoretical foundation, for the effect of bringing into play to greatest extent two cold water spray width adjusting systems, the needs tool that meets the production of many width sheet billet continuous casting is of great significance.
Summary of the invention
In view of this, the object of this invention is to provide the method that the cold water spray width of a kind of sheet billet continuous casting two is controlled.Can make two cold water spray width control more accurate, prevent that slab bight is excessively cold, avoid slab to produce corner crack.
The object of the invention is to be achieved through the following technical solutions:
The method that the cold water spray width of this sheet billet continuous casting two is controlled, comprises the following steps:
Step 1: be provided with several two cold-zones sections before slab aligning district, each two cold-zone section all arranges can independently be controlled it and " open " or nozzle loop, middle part and the limit portion nozzle loop of " pass ";
Step 2: the simulation model of setting up slab two dimension solidification and heat transfer by computer, according to steel slab surface cooling water inflow, the impact of slab bight Two-Dimensional Heat on board briquette, accurately simulate practical condition and calculate slab and laterally, longitudinally go up each position Temperature Distribution;
Step 3: utilize this two-dimentional solidification and heat transfer simulation model, according to preliminary selected nozzle model and layout, calculate the Temperature Distribution at each position of slab, the steel slab surface temperature of take is evenly target, adjusts type selecting and the layout of wide middle part nozzle of slab;
Step 4: the steel slab surface temperature of take is evenly target, determines reasonable selection and the layout of limit portion nozzle;
Step 5: utilize this two-dimentional solidification and heat transfer simulation model, calculate the Temperature Distribution that each determines the slab of width specifications;
Step 6: the limit portion nozzle loop that is opposite to "On" state, utilize this slab two dimension solidification and heat transfer simulation model, calculate the cooling water flow in this loop, according to the cooling water flow calculating, implement cooling, make the surface temperature of slab even, prevent the excessively cold of slab corner portion.
Further, in step 6, the surface temperature that realizes slab by following strategy is even:
The limit portion nozzle loop of first supposing each cooling section is placed in "On" state, calculate each position temperature of slab, the brittleness temperature scope of slab corner, the aligning district portion temperature obtaining if calculate in slab, the limit portion nozzle loop of slab aligning district two cold-zone sections should be placed in "Off" state, if temperature is higher than slab brittleness temperature scope, can be placed in "On" state, when being placed in "Off" state, the limit portion nozzle loop of aligning district two cold-zone sections calculates the slab corner portion temperature that obtains still within the scope of the brittleness temperature in slab time, continue to close the limit portion nozzle loop of last adjacent two cold-zone sections, calculate again, in the time of within the scope of the slab corner portion temperature obtaining if calculate or the brittleness temperature in slab, close again the limit portion nozzle loop of last two adjacent cold-zone sections, until showing aligning slab corner, district portion temperature, result of calculation avoided the brittleness temperature scope of slab,
Further, in step 3, the principle that the type selecting of wide middle part nozzle of each two cold-zones section and layout are optimized is to make as far as possible the steel slab surface temperature of acquisition even, can be specifically benchmark by the variance minimum of the discretization temperature spot being shown below, and optimizes most suitable arrangement of nozzles mode:
In formula:
temperature for each node of discretization;
The invention has the beneficial effects as follows:
The present invention utilizes the result of calculation of two-dimentional solidification and heat transfer simulation model, aligning slab corner, the district portion temperature of take is avoided brittleness temperature scope as target, can accurately determine the open and close state in each limit portion nozzle loop, can determine no longer by rule of thumb, two cold water spray width are controlled more accurate, prevent that slab bight is excessively cold, avoid slab to produce corner crack.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating below, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized and be obtained by description and claims below.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is the elevational schematic view of the crooked continuous casting plate blank equipment with aligning of band;
Fig. 2 is nozzle loop schematic diagram, is all the profile of A-A in Fig. 1;
Fig. 3 is two cold water spray width control program flow charts.
In figure: 11 ~ 17 be followed successively by the first to the 72 cold-zone section, 18 for aligning district two cold-zone sections, 19 for crystallizer, 110 be horizontal section.
The specific embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment is only for the present invention is described, rather than in order to limit the scope of the invention.
Shown in Fig. 1 is the existing two cold water spray width control function slab caster schematic diagrames of being with, general configuration comprises: each the two cold-zone sections before aligning district (comprise 8 altogether in figure, actual visual concrete condition adjustment, number consecutively is 11 to 18, wherein 18 is aligning district two cold-zone sections); 19 is crystallizer; 110 is horizontal section;
Fig. 2 is the profile of A-A in Fig. 1, and all there is 1 limit portion nozzle loop each two section both sides, cold-zone.Wherein 21 is limit portion nozzle loop, and 22 is nozzle loop, middle part, and 23 is limit portion nozzle, and 24 is middle part nozzle, and 25 is producible width of plate slab scope.
In each two cold-zone sections 11 ~ 18 before slab aligning district, all comprised the limit portion nozzle loop 21 and nozzle loop, middle part 22 shown in Fig. 2, and all can supply water separately, by controlling the open and close state in limit portion nozzle loop 21, control the temperature of aligning slab corner, district portion, the temperature that prevents corner portion is within the scope of slab brittleness temperature aligns.
The method that the cold water spray width of sheet billet continuous casting two of the present invention is controlled, specifically implements following steps:
Step 1: be provided with several two cold-zones sections before slab aligning district, each two cold-zone section all arranges can independently be controlled it and " open " or nozzle loop, middle part and the limit portion nozzle loop of " pass ";
Step 2: the simulation model of setting up slab two dimension solidification and heat transfer by computer, according to steel slab surface cooling water inflow, the impact of slab bight Two-Dimensional Heat on board briquette, accurately simulate practical condition and calculate slab and laterally, longitudinally go up each position Temperature Distribution; By the condition of revising the boundary, simulate truly the actual conditions of slab cooling procedure simultaneously, in patent of the present invention, adopted visual basic 6.0 programming language developments and there is the solidification and heat transfer simulation software of corresponding function;
Step 3: utilize this two-dimentional solidification and heat transfer simulation model, according to preliminary selected nozzle model and layout, calculate the Temperature Distribution at each position of slab, the steel slab surface temperature of take is evenly target, adjusts type selecting and the layout of wide middle part nozzle of slab; The jet angle, range, the spacing, adjacent two that specifically comprise nozzle are arranged nozzles dislocation layout etc., the principle of optimizing is to make as far as possible the steel slab surface temperature of acquisition even, can be specifically benchmark by the variance minimum of discretization temperature spot, as the formula (1), optimize most suitable arrangement of nozzles mode
In formula:
temperature for each node of discretization;
Step 4: as shown in Figure 2, the steel slab surface temperature of take is evenly target, optimize type selecting and the layout of each two section limit, cold-zone portion nozzles 21, according to the width specifications scope 25 of slab, determine jet angle, the nozzle range of limit portion nozzle, should meet the water spray requirement of minimum cross section, also meet the cooling needs of maximum section simultaneously;
Step 5: utilize this two-dimentional solidification and heat transfer simulation model, calculate the Temperature Distribution that each determines the slab of width specifications;
Step 6: the limit portion nozzle loop that is opposite to "On" state, utilize this slab two dimension solidification and heat transfer simulation model, calculate the cooling water flow in this loop, according to the cooling water flow calculating, implement cooling, make the surface temperature of slab even, prevent the excessively cold of slab corner portion.
Particularly, step 6 is in conjunction with slab two dimension solidification and heat transfer simulation model, determine under specific section width, the on off state in each two portion's nozzle loops, section limit, cold-zone 21, when the aligning district bight temperature of calculating acquisition is in slab brittleness temperature scope, limit portion nozzle loop 21 should be in "Off" state, and temperature is avoided brittleness temperature, can be placed in "On" state.As shown in Figure 3, simultaneously in conjunction with Fig. 1 and Fig. 2, concrete control strategy is as follows:
Table 1 is the two cold water spray width control method examples that obtain according to said method, totally 8 two cold-zone sections wherein, each two portion's nozzle loop, Duan Junshe limit, cold-zone, i.e. 1 ~ 8 limit portion nozzle loop in table 1, corresponding slab aligning position, limit portion nozzle loop 8.In specific width of plate slab situation, obtain slab corner, the aligning district portion temperature of avoiding brittleness temperature, should make limit portion nozzle loop 5 ~ 8 in closed condition, simultaneously, find the suitable cooling water inflow in limit portion nozzle loop 4, limit portion nozzle loop 1 ~ 3 adopts the initial setting water yield.
Two cold water spray width of table 1 certain width specification slab are controlled parameter
| Limit portion nozzle loop | Limit portion nozzle loop state | The limit portion nozzle loop water yield |
| 21 of 11 2 cold-zone sections | Open | Qinit(1) |
| 21 of 12 2 cold-zone sections | Open | Qinit(2) |
| 21 of 13 2 cold-zone sections | Open | Qinit(3) |
| 21 of 14 2 cold-zone sections | Open | Qset(4) |
| 21 of 15 2 cold-zone sections | Close | 0 |
| 21 of 16 2 cold-zone sections | Close | 0 |
| 21 of 17 2 cold-zone sections | Close | 0 |
| 21 of 18 2 cold-zone sections | Close | 0 |
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
1. the method that the cold water spray width of sheet billet continuous casting two is controlled, is characterized in that: comprise the following steps:
Step 1: be provided with several two cold-zones sections before slab aligning district, each two cold-zone section all arranges can independently be controlled it and " open " or nozzle loop, middle part and the limit portion nozzle loop of " pass ";
Step 2: the simulation model of setting up slab two dimension solidification and heat transfer by computer, according to steel slab surface cooling water inflow, the impact of slab bight Two-Dimensional Heat on board briquette, accurately simulate practical condition and calculate slab and laterally, longitudinally go up each position Temperature Distribution;
Step 3: utilize this two-dimentional solidification and heat transfer simulation model, according to preliminary selected nozzle model and layout, calculate the Temperature Distribution at each position of slab by computer, the steel slab surface temperature of take is evenly target, adjusts type selecting and the layout of wide middle part nozzle of slab;
Step 4: the steel slab surface temperature of take is evenly target, processes by computer, determines reasonable selection and the layout of limit portion nozzle;
Step 5: utilize this two-dimentional solidification and heat transfer simulation model, calculate the Temperature Distribution of the slab of determining each width specifications by computer;
Step 6: the limit portion nozzle loop that is opposite to "On" state, utilize slab two dimension solidification and heat transfer simulation model, the cooling water flow that calculates this loop by computer is also cooling according to the cooling water flow implementation strategy calculating, and makes the surface temperature of slab even, prevents the excessively cold of slab corner portion;
In step 6, the surface temperature that realizes slab by following strategy is even: the limit portion nozzle loop of presetting each cooling section by computer control is placed in "On" state, calculate each position temperature of slab, the brittleness temperature scope of slab corner, the aligning district portion temperature obtaining if calculate in slab, the limit portion nozzle loop of slab aligning district two cold-zone sections should be placed in "Off" state, if temperature is higher than slab brittleness temperature scope, can be placed in "On" state, when being placed in "Off" state, the limit portion nozzle loop of aligning district two cold-zone sections calculates the slab corner portion temperature that obtains still within the scope of the brittleness temperature in slab time, continue to close the limit portion nozzle loop of last adjacent two cold-zone sections, calculate again, in the time of within the scope of the slab corner portion temperature obtaining if calculate or the brittleness temperature in slab, close again the limit portion nozzle loop of last two adjacent cold-zone sections, until showing aligning slab corner, district portion temperature, result of calculation avoided the brittleness temperature scope of slab.
2. the method that the cold water spray width of sheet billet continuous casting two according to claim 1 is controlled, it is characterized in that: in step 3, the principle that the type selecting of wide middle part nozzle of each two cold-zones section and layout are optimized is to make as far as possible the steel slab surface temperature of acquisition even, can be specifically benchmark by the variance minimum of the discretization temperature spot being shown below, optimize most suitable arrangement of nozzles mode:
T
itemperature for each node of discretization;
N is the temperature nodes quantity of discretization;
The mean temperature that E (T) is all temperature nodes;
The variance that D (T) is all temperature nodes.
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