基于分析方法对烧结冷却系统余能利用
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摘要
介绍了烧结系统采用的环冷和竖罐式两种冷却工艺流程,通过计算数学模型对烧结工序各个系统进行了分析,比较了两种冷却模式的余热回收效果,结果表明,竖罐冷却模式能大大提高烧结矿的显热回收率,效率可达到75.39%,比环冷模式效率提高近20%;竖罐模式出口循环热风温度比环冷模式可提高230℃左右;两种模式回收的余热进入余热锅炉产生蒸汽,竖罐模式的蒸汽产量约为环冷模式的3倍。
Two cooling processes of ring and vertical tank used in the sintering system are introduced,exergy analysis was made for each subsystem of sintering procedure through mathematical model of exergy calculation,and the effect of waste heat recovery in two cooling processes was analyzed. The results show that the vertical tank cooling process can greatly increase the waste heat recovery efficiency of sinter,and exergy efficiency can reach 75.39%,almost 20% higher than that of exergy efficiency of ring cooling process. The circulation hot waste gas outlet temperature of vertical tank cooling process increased by nearly 230 ℃ than the ring cooling process. Waste heat was recovered by two cooling processes,and then entered into waste heat boiler to produce steam,and the vertical tank cooling process can produce up to3 times as much steam as the ring cooling process.
Two cooling processes of ring and vertical tank used in the sintering system are introduced,exergy analysis was made for each subsystem of sintering procedure through mathematical model of exergy calculation,and the effect of waste heat recovery in two cooling processes was analyzed. The results show that the vertical tank cooling process can greatly increase the waste heat recovery efficiency of sinter,and exergy efficiency can reach 75.39%,almost 20% higher than that of exergy efficiency of ring cooling process. The circulation hot waste gas outlet temperature of vertical tank cooling process increased by nearly 230 ℃ than the ring cooling process. Waste heat was recovered by two cooling processes,and then entered into waste heat boiler to produce steam,and the vertical tank cooling process can produce up to3 times as much steam as the ring cooling process.
引文
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[2]夏建芳,喻向阳,赵先琼.基于环冷机冷却能耗最小目标的工艺参数优化[J].钢铁研究学报,2016,28(1):13.(XIA Jianfang,YU Xiang-yang,ZHAO Xian-qiong.Optimization of process based on minimum target of cooling energy consumption of sinter cooler[J].Journal of Iron and Steel Research,2016,28(1):13.)
[3]董辉,赵勇,蔡九菊,等.烧结-冷却系统的漏风问题[J].钢铁,2012,47(1):95.(DONG Hui,ZHAO Yong,CAI Jiu-ju,et al.Leakage of sintering-cooling system[J].Iron and Steel,2012,47(1):95.)
[4]项宝胜,李建雄.京唐烧结厂580 m2环冷机跑偏分析及处理措施[J].中国冶金,2016,26(8):52.(XIANG Bao-sheng,LI Jian-xiong.Deviation analysis and treatment of 580 m2ring cooler in Jingtang sintering plant[J].China Metallurgy,2016,26(8):52.)
[5]彭岩,曹先常,张玉柱.钢铁典型工序流程节能技术新进展[J].中国冶金,2017,27(5):8.(PENG Yan,CAO Xian-chang,ZHANG Yu-zhu.New progresses of energy saving solutions in typical iron and steel making process flow[J].China Metallurgy,2017,27(5):8.)
[6]贾鸿屹.钢铁厂烧结机主抽风机变频改造实践[J].中国冶金,2017,27(2):57.(JIA Hong-yi.Main ventilation frequency transformation practice of sintering machine in steel plant[J].China Metallurgy,2017,27(2):57.)
[7]王海洋,张建良,王广伟,等.铁前系统的二氧化碳减排技术浅析[J].中国冶金,2018,28(1):1.(WANG Hai-yang,ZHANG Jian-liang,WANG Guang-wei,et al.Analysis of carbon dioxide emission reduction before ironmaking[J].China Metallurgy,2018,28(1):1.)
[8]沈勋,陈林根,夏少军,等.竖罐式和环冷式烧结矿冷却过程的数值模拟[J].中国科学:技术科学,2016,46(1):36.(SHEN Xun,CHEN Lin-gen,XIA Shao-jun,et al.Numerical simulation of cooling process in vertical tank and annular cooler[J].Science China:Technological Sciences,2016,46(1):36.)
[9]蔡九菊,董辉.烧结过程余热资源的竖罐式回收与利用方法及其装置:中国,200910187381.8[P].2009-09-15.(CAI Jiu-ju,DONG Hui.The Method and Device of Sintering Waste Heat Recovery and Utilization with Vertical Tank:China,200910187381.8[P].2009-09-15.)
[10]董辉,李磊,刘文军,等.烧结矿余热竖罐式回收利用工艺流程[J].中国冶金,2012,22(1):6.(DONG Hui,LI Lei,LIU Wenjun,et al.Process of waste heat recovery and utilization for sinter in vertical tank[J].China Metallurgy,2012,22(1):6.)
[11]冯军胜,董辉,王爱华,等.烧结余热罐式回收系统及其关键问题[J].钢铁研究学报,2015,27(6):7.(FENG Jun-sheng,DONG Hui,WANG Ai-hua,et al.Recovery system and key issues of vertical tank for recovering sinter waste heat[J].Journal of Iron and Steel Research,2015,27(6):7.)
[12]江文豪.烧结环冷机废气余热利用系统:中国,201610518889.1[P].2016-11-16.(JIANG Wen-hao.Waste Heat Utilization System of Sintering Ring Cooler:China,201610518889.1[P].2016-11-16.)
[13]陈文威,李沪萍.热力学分析与节能[M].北京:科学出版社,1999.(CHEN Wen-wei,LI Hu-ping.Thermodynamic Analysis and Energy Saving[M].Beijng:Science Press,1999.)
[14]张洪林.南钢烧结余热回收利用研究[D].沈阳:东北大学,2009.(ZHANG Hong-lin.Research on Recycling of Sintering Waste Heat of NISCO[D].Shenyang:Northeastern University,2009.)
[15]李汝辉,刘德彰,李世斌.能量有效利用[M].北京:北京航空航天大学出版社,1991.(LI Ru-hui,LIU De-zhang,LI Shi-bin.Effective Utilization of Energy[M].Beijng:Beihang University Press,1991.)
[16]孙用军,董辉,冯胜军,等.烧结-冷却-余热回收系统热力学分析[J].钢铁研究学报,2015,27(1):16.(SUN Yong-jun,DONG Hui,FENG Sheng-jun,et al.Thermodynamic analysis of waste heat recovery for sinter-cooling system[J].Journal of Iron and Steel Research,2015,27(1):16.)
[17]胡兵,贺新华,王兆才,等.烧结工序流分析及评价[J].中国冶金,2015,25(9):47.(HU Bing,HE Xin-hua,WANG Zhaocai,et al.Evaluation and analysis on exergy flow of sintering process[J].China Metallurgy,2015,25(9):47.)
[18]蔡海军,张忠孝,毕德贵,等.烧结余能利用的分析[J].烧结球团,2012,37(1):60.(CAI Hai-jun,ZHANG Zhong-xiao,BI De-gui,et al.Exergy analysis of energy utilization in sintering procedure[J].Sintering and Pelletizing,2012,37(1):60.)