热轧带钢盐酸紊流酸洗数学模型的研究

发布时间：2018-02-04 14:53

本文关键词： 紊流酸洗破鳞延伸率数学模型　出处：《华东理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：盐酸紊流酸洗技术具有酸洗效率高,质量好,节约成本的优点,因此目前国内外各大钢厂大多采用紊流酸洗技术对带钢进行酸洗处理。盐酸紊流酸洗的影响因素主要有盐酸温度、盐酸浓度、破鳞度、亚铁离子的浓度、紊流度等,其中紊流度的大小主要靠调节喷射到带钢的流量来控制,破鳞度主要靠调节拉矫破鳞装置的压下量和张紧力来调节。本文利用自主设计的拉矫破鳞试验机对带钢进行拉矫破鳞,从宏观和微观角度来观察破鳞前后带钢表面形貌和氧化皮结构的变化。运用自行设计制造的紊流酸洗试验装置对不同工艺参数进行酸洗试验,研究各参数与酸洗时间的关系,建立包括温度、浓度、破鳞度、紊流度四种因子的综合影响数学模型,并运用数学模型分析酸洗线的控制策略。研究结果表明：拉矫破鳞参数对酸洗时间的影响因子中压下量为主要影响因子；流量越大酸洗时间越短,流量达到一定值时对酸洗效率的提高不明显,流量与带钢速度成线性关系；带钢厚度和卷取温度对氧化皮结构和酸洗时间有一定的影响,薄的带钢厚度和低的卷取温度可形成较易酸洗的氧化皮结构；综合考虑各因子与酸洗时间的关系,建立综合影响数学模型,经验证其相关系数高于0.953,具有一定的参考价值,为酸洗线上酸洗时间的预测提供指导；提出一种运用数学模型分析的紊流酸洗控制策略。
[Abstract]:The hydrochloric acid turbulent pickling technology has the advantages of high pickling efficiency, good quality and cost saving. At present, most of the major steel mills at home and abroad use the turbulent pickling technology to pickle the strip steel. The main factors affecting the hydrochloric acid turbulent pickling are hydrochloric acid temperature, concentration of hydrochloric acid, scale breaking degree, and the concentration of ferrous ion. The turbulence degree is mainly controlled by adjusting the flow rate of jet to the strip steel. The scale breaking degree is mainly adjusted by adjusting the reduction and tension of the tension and straightening device. This paper makes use of the self-designed tensile straightening test machine to straighten the strip. The surface morphology and the structure of the oxidized strip before and after scale breaking were observed from the macroscopic and microscopic angles. Different technological parameters were tested by using the turbulent pickling test device designed by ourselves. The relationship between each parameter and pickling time was studied, and a mathematical model of comprehensive influence of four factors, temperature, concentration, scale breaking degree and turbulence degree, was established. The mathematical model is used to analyze the control strategy of pickling line. The results show that the influence of the parameters of scale breaking on the pickling time is the main factor. The larger the flow rate is, the shorter the pickling time is, the less the pickling efficiency is when the flow rate reaches a certain value, and the linear relationship between the flow rate and the strip speed. The thickness of strip and the coiling temperature have certain influence on the structure and pickling time of the oxidized sheet. The thin strip thickness and the low coiling temperature can form the structure of the oxidized sheet which is easy to pickle. Considering the relationship between each factor and pickling time, the mathematical model of comprehensive influence is established. The correlation coefficient is higher than 0.953, which has certain reference value and provides guidance for predicting pickling time on pickling line. A turbulent pickling control strategy based on mathematical model analysis is proposed.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG335.5

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