本文選題：步進(jìn)式加熱爐　切入點(diǎn)：壓力制度　出處：《安徽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：連續(xù)加熱爐爐膛壓力和壓力分布對爐子工作有著重要影響。目前大型連續(xù)步進(jìn)式軋鋼加熱爐爐膛長度較大,爐膛寬度大,供熱點(diǎn)多,爐膛壓力及其分布規(guī)律不詳。加熱爐的爐膛壓力制度對爐溫制度影響很大,掌握爐膛壓力分布的規(guī)律,控制煙閘的開啟度來調(diào)整爐內(nèi)各段的溫度分布,對加熱爐實(shí)施精確操作十分重要。在對某公司軋鋼加熱爐的熱工測試中發(fā)現(xiàn),爐膛局部壓力過高,窺視孔冒火現(xiàn)象嚴(yán)重,爐膛內(nèi)的料坯在寬度方向上加熱嚴(yán)重不均,料坯中部的中心溫度嚴(yán)重偏低,如此大的溫差必須用較長時間的均熱來消除,不僅影響了軋制產(chǎn)量,增加了燃耗,而且長時間的均熱還會引起金屬的大量燒損。本研究以某公司大型軋鋼加熱爐為研究對象,以加熱爐實(shí)際操作參數(shù)為邊界條件,采用數(shù)值模擬的方法,重點(diǎn)討論不同結(jié)構(gòu)的爐底隔墻對爐膛氣流分布的影響,對加熱爐爐膛壓力及其分布開展研究。分別就兩種爐底隔墻結(jié)構(gòu)下的加熱爐,利用Fluent軟件,在實(shí)時生產(chǎn)條件下,對爐膛內(nèi)部的溫度場、流場、壓力場進(jìn)行數(shù)值模擬。依據(jù)模擬計(jì)算結(jié)果,結(jié)合加熱爐的熱工測試結(jié)果進(jìn)行對比分析。研究結(jié)果表明:(1)不同結(jié)構(gòu)的爐底隔墻對加熱爐爐膛料坯加熱的均勻性產(chǎn)生了巨大差異。(2)爐底隔墻的存在,增加了爐膛沿程爐氣的運(yùn)行阻力。(3)大型板坯步進(jìn)式加熱爐多為頂部和側(cè)向供熱,加之板坯布料縫隙等的影響,爐膛在長度和寬度方向的壓力分布變化對爐膛煙氣的流動和分布產(chǎn)生巨大的影響。(4)隔墻對爐膛輻射熱的遮蔽,造成了對爐料加熱的嚴(yán)重不均,料坯中部溫度的不均勻性尤為突出。(5)爐膛長度方向上的尺寸巨大,煙道抽力對爐膛壓力的調(diào)整顯得力不從心。局部爐膛壓力過高,不僅對爐膛的供熱、供風(fēng)產(chǎn)生影響,而且對爐墻的使用壽命產(chǎn)生嚴(yán)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.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG307

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本文編號：1580523