钢铁制造流程中空分系统的有用能研究

发布时间：2018-04-13 01:06

本文选题：(?)分析 + 空分流程　；参考：《北京科技大学》2015年博士论文

【摘要】：空分产品是钢铁企业重要的二次能源介质,由于空分工艺流程以及操作运行水平的差异,各企业之间能耗水平差别较大,如何降低空分产品能耗和提高空分机组运行经济性一直是钢铁行业关注的重要问题。本文在传统的基于热力学第一定律的衡算节能研究的基础上,升级引入第二定律,采用(?)分析方法指导空分产品节能研究：对空分气体产品在现代钢铁生产中的作用进行了较为全面的调查研究和分析、计算。指出空分系统是现代钢铁企业不可或缺的工艺单元。其电耗在全企业电耗中所占份额超过10%。而在氧气炼钢过程中元素氧化的发热量约为制氧能耗的4-5倍。对唐山钢铁公司的钢铁生产和用氧现状进行了全面的调研分析,得知唐钢目前吨钢耗氧量约为56m3,比理论值冗余量约为5.0%,高炉炼铁富氧量约为每吨生铁40～45m3,总的综合用氧量接近l00m3/t-粗钢。借助于物性参数计算软件包,对唐钢40000m3/h的空分单元进行(?)分析,获得不同产品的产量对普遍炯效率的影响定量规律：液体总产量增加9%(300m3),炯效率可提高0.7～1.0%：氧气产量增加10%,炯效率可提高1.3%。不同的产品组合,其流程(?)效率是不同的,存在最优值。基于炯分析结果,实施内外结合氧/氮互换的变负荷柔性操作,指出唐钢气体应配置液化氧气量为14000m3的液化装置,可以提高系统的炯效率和降低氧气或氮气的放散率。在炯分析的理论指导下,对炼钢供氧输送系统进行了优化改造,在保证炼钢用氧压力不变的前提下将输送压力3.0MPa(G)降低至1.5MPa(G)。基于本论文的研究,唐钢气体公司获得了明显的节能、增效的结果,取得专利发明,得到冶金行业的好评。
[Abstract]:Air separation product is an important secondary energy medium in iron and steel enterprises.How to reduce the energy consumption of air separation products and improve the operating economy of air separation units has been an important issue of iron and steel industry.Based on the traditional energy conservation research based on the first law of thermodynamics, this paper introduces the second law and adopts the second law.The analysis method guides the energy saving research of air separation products:The function of air separation gas product in modern steel production is investigated, analyzed and calculated.It is pointed out that air separation system is an indispensable process unit in modern iron and steel enterprises.The share of electricity consumption in the whole enterprise is more than 10.In the process of oxygen steelmaking, the calorific value of elemental oxidation is about 4-5 times of the energy consumption of oxygen production.The present situation of iron and steel production and oxygen use in Tangshan Iron and Steel Company is investigated and analyzed comprehensively.It is known that the oxygen consumption of steel per ton is about 56m3 at Tangshan Iron and Steel Group Co., Ltd., the excess oxygen is about 5.0 than the theoretical value, the oxygen-rich capacity of blast furnace ironmaking is about 40,45m3 per ton of pig iron, and the total comprehensive oxygen consumption is close to 1000m3 / t- crude steel.The air separation unit of 40000m3/h in Tangshan Iron and Steel Co.The quantitative law of the effect of output of different products on general jiong efficiency was obtained: the total liquid yield increased by 9 ~ 300m ~ 3, the efficiency increased by 0.7 ~ 1.0cm, the oxygen yield increased by 10, and the efficiency increased by 1.3cm.Different product combinations, processesEfficiency is different, there is an optimal value.Based on the results of jiong analysis, the variable load flexible operation of oxygen / nitrogen exchange is carried out. It is pointed out that Tangshan Iron and Steel should be equipped with liquefied oxygen with 14000m3, which can improve the efficiency of the system and reduce the rate of oxygen or nitrogen release.Under the guidance of the theory of jiong analysis, the oxygen supply transportation system for steelmaking was optimized and reformed. Under the premise of keeping oxygen pressure constant for steelmaking, the conveying pressure was reduced from 3.0 MPA GG to 1.5 MPA GN.Based on the research of this paper, Tangshan Iron and Steel Co., Ltd has obtained obvious results of energy saving and efficiency, patent invention and high praise in metallurgical industry.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TF089;TQ116.11

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