Method for adjusting water yield of continuous casting production in high-latitude area
阅读说明：本技术 一种高纬度地区连铸生产水量调整的方法 (Method for adjusting water yield of continuous casting production in high-latitude area ) 是由 魏国立 朱青德 胡绍岩 董德平 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种高纬度地区连铸生产水量调整方法,通过检测结晶器进水温度、二冷水进水温度及连铸生产环境温度,根据开浇前进水温度设定开浇水量；随着生产过程进行结晶器进水温度及二冷水进水温度将逐步升高,根据温度变化梯度微调结晶器及二冷水水量,保证结晶器冷却效率不变,连铸坯进矫直区前温度基本稳定,保证连铸生产顺行、铸坯质量稳定。本发明通过温度变化梯度调整,稳定了低温或高温环境下结晶器冷却效率,结合环境温度对于二冷水进行互动调整,换季期间生产事故得到控制,特别是对于低温环境下铸坯进矫直区的温度,铸坯内外部裂纹将大幅减少,对于提升铸坯质量具有明显的意义。(The invention discloses a method for adjusting the water volume of continuous casting production in a high latitude area, which comprises the steps of detecting the water inlet temperature of a crystallizer, the water inlet temperature of secondary cooling water and the temperature of a continuous casting production environment, and setting the casting starting water volume according to the water inlet temperature before casting starting; the water inlet temperature of the crystallizer and the water inlet temperature of secondary cooling water are gradually increased along with the production process, the water amount of the crystallizer and the water amount of the secondary cooling water are finely adjusted according to the temperature change gradient, the cooling efficiency of the crystallizer is guaranteed to be unchanged, the temperature of the continuous casting billet is basically stable before the continuous casting billet enters a straightening area, and the continuous casting production is guaranteed to be smooth and the quality of the continuous casting billet is stable. According to the invention, the cooling efficiency of the crystallizer in a low-temperature or high-temperature environment is stabilized by adjusting the temperature change gradient, the secondary cooling water is adjusted interactively by combining the environmental temperature, production accidents are controlled during season change, particularly, for the temperature of a casting blank entering a straightening area in the low-temperature environment, internal and external cracks of the casting blank are greatly reduced, and the method has obvious significance for improving the quality of the casting blank.)
1. A method for adjusting the water yield of continuous casting in high latitude areas is characterized by comprising the following steps:
step 101: setting temperature measuring points to measure temperature data, wherein the setting of the environmental temperature measuring points on the operation platform upright post, the setting of the temperature detecting points on the crystallizer and the secondary cold water inlet main pipe, and the setting of the environmental temperature measuring points on the secondary cold chamber are included;
step 102: confirming the temperature of each temperature measuring point before the continuous casting machine starts casting, and determining a crystallizer and a secondary cooling water distribution coefficient before the casting according to the temperature data measured in the step 101;
step 103: and (4) comparing the environment temperature of the secondary cooling chamber measured in the step (101) with the standard temperature, adjusting the water inflow of the crystallizer, and adjusting the secondary cooling water distribution coefficient before casting.
2. The method for adjusting the water yield in the continuous casting in the high latitude areas according to claim 1, wherein in step 102, when the temperature of each temperature measuring point reaches the positive production requirement, the water distribution coefficient designed for each steel type is adopted for production.
3. The method for adjusting the water yield in the continuous casting production in the high latitude area according to claim 1, wherein in step 103, when the crystallizer feed water temperature is lower than the standard temperature, the crystallizer feed water amount is increased before casting, and the water distribution coefficients of each area of the secondary cooling area are adjusted before casting.
4. The method for adjusting the water yield in the continuous casting production in the high latitude area according to claim 1, wherein in step 103, when the crystallizer feed water temperature is higher than the standard temperature, the crystallizer feed water amount is increased before casting, and the water distribution coefficients of each area of the secondary cooling area are adjusted upwards before casting.
5. The method for adjusting the water yield in the continuous casting production in the high latitude areas according to claim 3 or 4, characterized in that the temperature of the water entering the withdrawal and straightening unit is controlled at 950 ℃ by adjusting the water inflow of the crystallizer and the water distribution coefficients of the areas in the secondary cooling area.
6. The method of claim 3, wherein the crystallizer feed water temperature is increased by 3 ℃ and the increased crystallizer feed water amount is decreased proportionally, and when the crystallizer feed water temperature reaches 22 ℃, the crystallizer feed water amount is restored to normal production level.
7. The method for adjusting the water yield in the continuous casting production in the high latitude areas according to claim 3, characterized in that the secondary cooling water distribution is adjusted and controlled according to the 1% up-regulation at the temperature of 5 ℃, and the standard water distribution coefficient of steel grade is executed when the temperature of the secondary cooling water rises to 22 ℃.
8. The method of claim 4, wherein the amount of crystallizer feed water is increased by 3 ℃ every time the temperature of crystallizer feed water rises, and the amount of crystallizer feed water is increased by 350L/min at maximum when the temperature of crystallizer feed water reaches 38 ℃, and then the amount of crystallizer feed water is maintained for production.
9. The method for adjusting the water yield in the continuous casting production in the high latitude areas as claimed in claim 4, wherein the secondary cooling water distribution is adjusted according to the 1% up-regulation at the temperature of 5 ℃, the water distribution coefficient of the steel grade is 1.1 when the temperature of the secondary cooling water rises to 38 ℃, and the coefficient is maintained for continuous production.
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for adjusting the water yield of continuous casting production in high latitude areas.
Background
In the production process of steelmaking continuous casting, molten steel continuously exchanges heat with water through a crystallizer in the production process of a continuous casting machine, a blank shell with a certain thickness is generated in the crystallizer, the blank shell with a liquid core and enough thickness is pulled out of the crystallizer by a pulling and straightening system, and finally, the blank shell is completely solidified under continuous cooling of secondary cooling water to prepare a qualified continuous casting billet. In the design specification of continuous casting engineering, the water inlet temperature range of cooling water of a crystallizer is required to be 35-45 ℃, the temperature control range of the continuous casting crystallizer is basically controlled to be 28-32 ℃ in the actual production process, the water inlet and outlet temperature difference of the crystallizer can be controlled to be 7 ℃, and the cooling effect is good; when the temperature is higher than or lower than the temperature range, the heat transfer efficiency of the cooling water is greatly reduced, so that the cooling effect of the continuous casting billet is directly influenced by the temperature change of the inlet water of the crystallizer and the secondary cooling water, and the quality of the continuous casting billet is finally determined.
With the further development of the steel-making technology, the temperature control range of the continuous casting tundish is gradually reduced, and the continuous casting constant-drawing speed operation is realized. The continuous casting crystallizer and the secondary cold water inlet temperature are controlled in a definite range when the continuous casting machine is designed. Because the north-south span of China is large, the environmental temperature difference is large along with the change of regions and seasons, and the change of annual temperature of high latitude regions at minus 25 ℃ to 35 ℃ is normal. The large environmental temperature difference causes the continuous casting water inlet temperature to fluctuate, even if a continuous casting machine with a steam heating device is arranged in winter, the continuous casting crystallizer and secondary cooling water in the early stage of casting are low in temperature due to gaps among casting times of the continuous casting machine, the water temperature gradually rises along with the production, and the temperature of the crystallizer and the secondary cooling water can reach more than 20 ℃ until the secondary casting time is produced to more than 20 furnaces; a continuous casting machine with a cooling tower is arranged in high-temperature seasons in summer, the temperature of a crystallizer and secondary cooling water can basically reach more than 30 ℃ from the middle stage of production to the casting, and huge temperature fluctuation causes serious influence on the quality of continuous casting billets.
With the continuous improvement of the requirements of the manufacturing industry and the improvement of the quality of products in the steel industry, the quality of the continuous casting blank is used as an intermediate product for determining the quality of a final product, the quality control of the continuous casting blank greatly determines the quality of the final product, the cooling effect of the continuous casting process has great influence on the continuous casting blank, the cooling effect of the continuous casting process is solved, and a great deal of research is carried out by the industry for many years to obtain good effect. However, for steel mills in high latitude areas, the problem that the continuous casting cooling quality is finally influenced by the change of the water inlet temperature of the continuous casting cooling water due to the great change of the environmental temperature is not solved.
The Chinese patent 201310490661.2 discloses a dynamic water distribution model of slab caster, which is composed of 7 secondary cooling zones of caster, including cooling zone I, cooling zone II, cooling zone III, cooling zone IV, cooling zone V, cooling zone VI and cooling zone VII, and the actual water consumption is Q = AV2According to the requirements of the formula + BV + C, products produced by the continuous casting machine comprise ordinary carbon low-alloy series steel and medium-high carbon alloy series steel, three stages are divided every year, the surface temperature of a casting blank is controlled according to the change conditions of slab equipment and climatic conditions by combining produced steel products, and the dynamic water distribution model adjusts model parameters according to the corresponding formula to realize dynamic control. According to the dynamic water distribution model of the slab caster, the crystallizer and the secondary cooling water distribution model are adjusted in time according to the change of climate and external conditions and the characteristics of slab production, the slab dynamic water distribution model is established, the surface quality and the internal quality of a slab casting blank are stabilized, and the problem of casting blank quality caused by the change of factors such as external climate and the like is solved. Although the patented method is divided into three stages for one year, and the water quantity of the crystallizer water and the water quantity of the secondary cooling water are finely adjusted in each stage, the method is not considered enough for specific conditions, and the quality problem of the continuous casting billet caused by severe change of the environmental temperature cannot be thoroughly solved.
When the environmental temperature is close to minus 30 ℃, the highest water inlet temperature of the crystallizer can only reach about 10 ℃ even if a pumping station of a continuous casting machine heated by steam is used at the early stage of casting, so that the heat transfer efficiency of the crystallizer is greatly reduced, the thickness of a blank shell at the mouth of the crystallizer is thinned, and the steel leakage risk of continuous casting is increased; because the ambient temperature is extremely low, the cooling effect of the secondary cooling is greatly improved, the secondary cooling temperature is changed too much, and the risk of forming surface crack defects in the straightening area is increased. In the environment that the environmental temperature in summer reaches more than 38 ℃, the pump station is provided with the cooling tower, so that the water inlet temperature of the crystallizer in the whole casting time can not meet the requirement, the water inlet temperature of the crystallizer in the later period of the casting time can reach more than 35 ℃, the cooling efficiency of the crystallizer can be greatly weakened, and the thickness of a blank shell can be thinned; because the environmental temperature is higher, the cooling effect of secondary cooling becomes worse, which causes the back shift of the solidifying point of the casting blank liquid core, and the possibility of leakage cutting or increase of the central loose grade exists. Production tracking data over years show that: when the environmental temperature is higher than 30 ℃, the probability of surface defects appearing at the later stage of the same casting time is increased by more than 15 percent; when the environmental temperature is lower than minus 20 ℃, the probability of surface defects appearing at the early stage of the same casting time is increased by more than 20 percent. The above data illustrate from another side that the method of dividing one year into three periods for control has a large defect, and the defect of the casting blank caused by the influence of the environmental temperature cannot be eliminated.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for adjusting the water yield of continuous casting production in high latitude areas.
The invention provides a method for adjusting the water yield of continuous casting production in high latitude areas, which comprises the following steps:
step 101: setting temperature measuring points to measure temperature data, wherein the setting of the environmental temperature measuring points on the operation platform upright post, the setting of the temperature detecting points on the crystallizer and the secondary cold water inlet main pipe, and the setting of the environmental temperature measuring points on the secondary cold chamber are included;
step 102: confirming the temperature of each temperature measuring point before casting of the continuous casting machine, and determining the crystallizer and secondary cooling water distribution parameters before casting according to the temperature data measured in the
step 103: and (4) comparing the environment temperature of the secondary cooling chamber measured in the step (101) with the standard temperature, adjusting the water inflow of the crystallizer, and adjusting the secondary cooling water distribution coefficient before casting.
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The invention has the beneficial effects that: the water inlet temperature of crystallizer water and secondary cooling water is detected, and the water quantity of the crystallizer and the secondary cooling water are adjusted in a high-temperature environment by combining detection results, so that the water quantity of the crystallizer is increased to ensure that the cooling efficiency of the crystallizer is unchanged, the water quantity of the secondary cooling water is increased to ensure that the cooling efficiency of the secondary cooling is unchanged, the problems that the cooling strength of the whole crystallizer is weak due to the high-temperature environment, a blank shell of the crystallizer is thinned, steel leakage is easy to occur, a pit appears after the solidification tail end moves backwards and the like are avoided, and the continuous casting production stability and the; the water quantity of the crystallizer and the water quantity of the secondary cooling water are adjusted in a low-temperature environment, the water quantity of the crystallizer is increased to ensure that the cooling efficiency of the crystallizer is unchanged, the water quantity of the secondary cooling water is reduced to ensure that the cooling efficiency of the secondary cooling water is unchanged, and the problems that a blank shell of the crystallizer is thinned and is easy to bleed out, the secondary cooling strength is too large to cause surface cracks, the temperature before a casting blank is straightened is low and the like due to the fact that the cooling efficiency of the crystallizer is reduced and the cooling strength of a secondary cooling area is increased caused by the low-temperature environment. In addition, the water quantity is respectively adjusted according to the inlet water temperature detection results of the crystallizer water and the secondary cooling water, so that the problem of cooling strength change caused by continuous temperature change of the crystallizer water and the secondary cooling water during continuous casting production is solved, and the continuous casting production stability and the casting blank quality improvement are facilitated; meanwhile, with the production, the related parameters of the crystallizer and secondary cooling water are continuously adjusted, the influence on continuous casting caused by large environmental temperature difference in high latitude areas is solved, and the method has good practical significance for improving the quality of casting blanks.
Drawings
Fig. 1 is a flowchart of a method for adjusting the water yield of continuous casting in high latitude areas according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The cooling system comprises a crystallizer water inlet pipeline temperature detecting instrument, a secondary cold water inlet pipeline temperature detecting instrument, a crystallizer system, a continuous casting secondary cold water system, a crystallizer water automatic regulating system and a secondary cold water automatic regulating system. The temperature monitors are respectively arranged on the two water inlet pipelines, the detection result is fed back to the interface of the central control system, and relevant parameters are adjusted according to the fed-back crystallizer water inlet temperature and the fed-back secondary cooling water inlet temperature, so that the cooling strength of the crystallizer and the secondary cooling system is basically stable.
When the temperature of the water inlet of the crystallizer is lower than 18 ℃ and the environmental temperature is lower than 0 ℃, the water quantity of the crystallizer needs to be adjusted up, so that the temperature gradient of a copper plate of the crystallizer is ensured, and meanwhile, the secondary cold water of the crystallizer is weakened zone by zone, so that the solidification tail end position of a continuous casting billet is basically kept unchanged; when the temperature of the crystallizer inlet water is higher than 32 ℃, the water quantity of the crystallizer needs to be increased and the secondary cooling water needs to be strengthened at the same time, so that the integral cooling efficiency is ensured to be unchanged.
As shown in fig. 1, a method for adjusting the water yield of continuous casting in high latitude areas according to an embodiment of the present invention includes the following steps:
step 101: setting temperature measuring points to measure temperature data, wherein the setting of the environmental temperature measuring points on the operation platform upright post, the setting of the temperature detecting points on the crystallizer and the secondary cold water inlet main pipe, and the setting of the environmental temperature measuring points on the secondary cold chamber are included;
step 102: confirming the temperature of each temperature measuring point before casting of the continuous casting machine, and determining the crystallizer and secondary cooling water distribution parameters before casting according to the temperature data measured in the
step 103: and (4) comparing the environment temperature of the secondary cooling chamber measured in the step (101) with the standard temperature, adjusting the water inflow of the crystallizer, and adjusting the secondary cooling water distribution coefficient before casting.
Setting an environment temperature measuring point on an operating platform upright post, wherein the provided environment temperature mainly measures the influence of the environment temperature on the cooling efficiency; temperature detection points are added on the crystallizer and the two cold water inlet main pipes, and the provided inlet water temperature is mainly used for measuring the cooling efficiency change of cooling water; an environment temperature measuring point is arranged in the secondary cooling chamber, and the provided environment temperature is mainly used for measuring the influence of the temperature change of the secondary cooling chamber on the cooling efficiency of the secondary cooling water.
Further, confirming the detection temperature of each point before casting of the continuous casting machine, and determining a crystallizer and secondary cooling water distribution parameters before casting according to the measured temperature data; the temperature fed back by each detection point can be changed continuously along with the production of the casting machine, the water quantity needs to be adjusted step by step, and when all the temperatures meet the normal production requirement, water distribution parameters designed by various steel grades are adopted for production.
Furthermore, the environmental temperature is lower in winter, the water inlet temperature of the crystallizer is far lower than the standard temperature, the heat transfer efficiency of the crystallizer is weakened, the water quantity needs to be properly increased before casting, and the cooling effect of the crystallizer is ensured; meanwhile, the cooling efficiency of secondary cooling water is enhanced due to lower environmental temperature, the water distribution coefficient of each area needs to be properly adjusted downwards before casting, and the temperature of the secondary cooling water entering the withdrawal and straightening unit is ensured to be controlled to be about 950 ℃; meanwhile, the water inlet temperature of the crystallizer is gradually increased along with the continuous production, the increased water quantity of the crystallizer is proportionally reduced by taking the water inlet temperature as a section every time the water inlet temperature is increased by 3 ℃, and when the water inlet temperature of the crystallizer reaches 22 ℃, the water quantity of the crystallizer is restored to the normal production level; and secondary cooling water distribution is regulated and controlled according to the rising of 5 ℃ and the rising of 1 percent, and the secondary cooling water temperature rises to 22 ℃ to execute the standard water distribution coefficient of the steel grade.
Furthermore, the environmental temperature in summer is higher, so that the water inlet temperature of the crystallizer is far higher than the standard temperature, the heat transfer efficiency of the crystallizer is weakened, the water quantity needs to be properly increased before casting, and the cooling effect of the crystallizer is ensured; meanwhile, the cooling efficiency of secondary cooling water is weakened due to higher environmental temperature, the water distribution coefficient of each area needs to be properly adjusted upwards before casting, and the temperature of the secondary cooling water entering the withdrawal and straightening unit is ensured to be controlled to be about 950 ℃; meanwhile, the water inlet temperature of the crystallizer is gradually increased along with the continuous production, the increased water quantity of the crystallizer is proportionally reduced by taking the water inlet temperature as a section every time the water inlet temperature is increased by 3 ℃, when the water inlet temperature of the crystallizer reaches 38 ℃, the water quantity of the crystallizer is increased by 350L/min to the maximum, and then the water quantity is kept for production; the secondary cooling water distribution is regulated and controlled according to the rising of 5 ℃ and the rising of 1 percent, the secondary cooling water temperature rises to 38 ℃, the water distribution coefficient of the steel grade is executed to be 1.1, and then the coefficient is kept for continuous production.
The water adopted in the embodiment of the invention is the water which meets the water requirement of the crystallizer or the index water of the secondary cooling system respectively; in addition, the water quantity coefficient of the casting machine at the design standard temperature is set to be 1, the corresponding watering quantity starting mode is selected by combining the measured temperature feedback value, and the correlation coefficient is finely adjusted along with the change of the production temperature. In the specific operation:
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