大型轧钢加热炉炉膛压力分布的数值模拟

发布时间：2018-03-07 18:53

本文选题：步进式加热炉　切入点：压力制度　出处：《安徽工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：连续加热炉炉膛压力和压力分布对炉子工作有着重要影响。目前大型连续步进式轧钢加热炉炉膛长度较大,炉膛宽度大,供热点多,炉膛压力及其分布规律不详。加热炉的炉膛压力制度对炉温制度影响很大,掌握炉膛压力分布的规律,控制烟闸的开启度来调整炉内各段的温度分布,对加热炉实施精确操作十分重要。在对某公司轧钢加热炉的热工测试中发现,炉膛局部压力过高,窥视孔冒火现象严重,炉膛内的料坯在宽度方向上加热严重不均,料坯中部的中心温度严重偏低,如此大的温差必须用较长时间的均热来消除,不仅影响了轧制产量,增加了燃耗,而且长时间的均热还会引起金属的大量烧损。本研究以某公司大型轧钢加热炉为研究对象,以加热炉实际操作参数为边界条件,采用数值模拟的方法,重点讨论不同结构的炉底隔墙对炉膛气流分布的影响,对加热炉炉膛压力及其分布开展研究。分别就两种炉底隔墙结构下的加热炉,利用Fluent软件,在实时生产条件下,对炉膛内部的温度场、流场、压力场进行数值模拟。依据模拟计算结果,结合加热炉的热工测试结果进行对比分析。研究结果表明:(1)不同结构的炉底隔墙对加热炉炉膛料坯加热的均匀性产生了巨大差异。(2)炉底隔墙的存在,增加了炉膛沿程炉气的运行阻力。(3)大型板坯步进式加热炉多为顶部和侧向供热,加之板坯布料缝隙等的影响,炉膛在长度和宽度方向的压力分布变化对炉膛烟气的流动和分布产生巨大的影响。(4)隔墙对炉膛辐射热的遮蔽,造成了对炉料加热的严重不均,料坯中部温度的不均匀性尤为突出。(5)炉膛长度方向上的尺寸巨大,烟道抽力对炉膛压力的调整显得力不从心。局部炉膛压力过高,不仅对炉膛的供热、供风产生影响,而且对炉墙的使用寿命产生严重危害。
[Abstract]:The pressure and pressure distribution in the furnace of continuous heating furnace has an important influence on the work of the furnace. At present, the furnace length, width and heating point of large continuous step rolling reheating furnace are large, the furnace width is large, and the heating point is many. Furnace pressure and its distribution are unknown. The furnace pressure system of reheating furnace has a great influence on the furnace temperature system. The temperature distribution of each section of furnace can be adjusted by controlling the opening degree of flue gas gate and mastering the rule of furnace pressure distribution. It is very important to carry out accurate operation of reheating furnace. It is found that the local pressure of furnace is too high, the burning phenomenon of peep hole is serious, and the material billet in furnace is heated unevenly in width direction. The center temperature in the middle of the billet is on the low side. Such a large temperature difference must be eliminated with a long time of homogenization, which not only affects the rolling production, but also increases the fuel consumption. In this study, the large rolling furnace of a certain company is taken as the research object, and the actual operating parameters of the furnace are taken as the boundary conditions, and the numerical simulation method is adopted. This paper mainly discusses the influence of the bottom wall of the furnace on the flow distribution of the furnace, and studies the pressure and distribution of the furnace. The reheating furnace under the two kinds of structure of the partition wall under the bottom of the furnace is produced in real time by using the Fluent software. The temperature field, flow field and pressure field inside the furnace are numerically simulated. The comparison and analysis of the thermal test results of the reheating furnace show that: 1) the structure of the bottom partition wall of the furnace has a great difference on the uniformity of the furnace billet heating. (2) the existence of the furnace bottom partition wall. The running resistance of furnace gas along the furnace is increased. (3) large slab walking heating furnaces are mostly for top and lateral heating, together with the influence of slab distribution gap, etc. The pressure distribution in the length and width of the furnace has a great influence on the flow and distribution of flue gas in the furnace. The inhomogeneity of the temperature in the middle part of the billet is especially prominent. The dimension in the length direction of the furnace is huge, and the adjustment of the flue pumping force to the furnace pressure is not enough. The local furnace pressure is too high, which not only has an effect on the heating and supply of air in the furnace, And the service life of the furnace wall has serious harm.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG307

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