高炉喷吹富氢煤造气工艺的[火用]分析  

Exergy of blast furnace integrated with hydrogen-rich coal gasification

作　　者：李建鹏 刘小杰 吕庆 赵军 李欣 郄亚娜 LI Jian-peng;LIU Xiao-jie;LÜQing;ZHAO Jun;LI Xin;QIE Ya-na(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Tangshan Branch,HBIS Group Co.,Ltd.,Tangshan 063020,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河钢集团有限公司唐山分公司,河北唐山063020

出　　处：《钢铁》2023年第3期43-52,共10页Iron and Steel

基　　金：国家自然科学基金资助项目(52004096);中国科学基金资助项目(E2021209023);河北省重点研发计划资助项目(22374003D);国家自然科学基金资助项目(51874139)。

摘　　要：针对高炉喷吹富氢煤造气新工艺,在采用热质平衡数学模型获得系统整体物质流的基础上,利用[火用]分析理论建立了相应的[火用]流分析数学模型,评价其能量利用情况。对传统高炉和两种工况条件下喷吹富氢煤造气高炉系统的[火用]流分布以及[火用]损失、热力学完善度、[火用]效率等主要[火用]指标进行计算和进一步分析。结果表明,与传统高炉物料结果相比,新工艺两种工况下条件下的矿石用量、鼓风量、渣量和炉顶煤气产生量等资源消耗、副产品降低幅度较为明显;技术经济指标中,喷吹富氢煤造气高炉工况1号和工况2号的焦比分别降低了9.2%和22.3%;尽管煤比升高了18.6%和26.1%,但系统整体燃料比仍降低1.1%和8.2%。高炉喷吹富氢煤气新工艺的[火用]能结构不同于传统高炉,[火用]收入来自于高炉单元的焦炭和造气炉单元的煤,同时增加了造气炉单元焦炉煤气和工业氧的[火用]投入。虽然新工艺两种工况下总[火用]投入较传统高炉分别升高了5.4%和5.1%,但外供煤气可利用的质量较高,[火用]收益较高。新工艺总[火用]损失明显降低,较传统高炉降低了16.5%和21.7%,热力学完善度由传统高炉的82.0%上升到了85.6%和86.5%,能量利用质量得到了提高。此外,新工艺[火用]效率也有所升高,其中工况2号的[火用]效率提高了6.8%,较传统高炉具有更高的能量转化利用效率。可见,高炉喷吹煤造气新工艺是一种非常有效的炼铁工艺。For the new iron-making process integrated with blast furnace and hydrogen-rich coal gasification,the ex-ergy analysis model is established according to the mass flow obtained from the mass and heat balance model to eval-uate its energy utilization.The exergy flows and main exergy indexes such as exergy loss,thermodynamic perfection degree and exergy efficiency of the traditional blast furnace and two kinds of new iron-making process are calculated and analyzed comparatively.Compared with the mass flow of traditional blast furnace,the resource consumption and by-products of new process such as ore,blast,slag and top gas produced significantly reduce.Notably,the coke ratio of case No.1and case No.2is reduced by 9.2%and 22.3%respectively.Although the coal ratio increases by 18.6%and 26.1%,the fuel rate decreases by 1.1%and 8.2%.The exergy structure of new process is different from that of traditional blast furnace.Its exergy input includes the exergy of coke in blast furnace and the exergy of coal in gasifier.Besides,the exergy of coke oven gas and industrial oxygen injected in gasifier also be involved.Al-though the total exergy input of new process is 5.4%and 5.1%higher than that of traditional blast furnace,the a-vailable quality of externally supplied top gas is higher,the exergy obtains is more.The total exergy loss of case No.1and case No.2is significantly reduced by 16.5%and 21.7%than that of traditional blast furnace,and the thermodynam-ic perfection degree increases from 82.0%of traditional blast furnace to 85.6%and 86.5%,which indicates the en-ergy utilization quality is improved.Additionally,the exergy efficiency of new process is increased,in particular the exergy efficiency of case No.2increases by 6.8%.Therefore,the blast furnace integrated with hydrogen-rich coal gasification has higher energy conversion and utilization efficiency,which demonstrated it is a very effective iron-making process.

关 键 词：喷吹富氢煤造气高炉系统 [火用]分析模型 物质流 [火用]流 [火用]评价 

分 类 号：TF538.63[冶金工程—钢铁冶金]