烧结余能高效循环利用技术研究与应用
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摘要
针对烧结环冷机中低温烟气外排造成的余能浪费以及环境污染等问题,通过中低温烟气循环利用的技术机理与工艺设计的有效结合,从烟气温度、烟气作用时间及烟气粉尘的主动控制三个方面对烟气余能循环利用技术进行了优化,并应用于新钢两台360m~2烧结机。生产实践表明,烟气温度、烟气作用时间及烟气粉尘对烧结工艺指标产生了较大的影响。当烟气温度保持在250±25℃之间,烟气作用时间占总烧结时间比例控制在50%左右,以及烟气中粉尘含量在200mg/m~3以下时,烧结利用系数提高0.01～0.02t/(m~2·h),固体燃耗降低2.33～2.35 kg/t,烧结矿转鼓强度提高了0. 50%～0. 54%,筛分指数降低0. 12%～0. 14%,FeO质量分数降低0.32%～0.34%。此外,每台烧结机每年可减少环冷机热废气排放量约25800万Nm~3。
In view of the problems of residue energy waste and environmental pollution caused by the external discharge of medium-low temperature flue gas from the circular cooler of sinter machine,by effectively combining the technical mechanism and process design for cyclic utilization of medium-low temperature flue gas,the cyclic utilization technology for residue energy of waste gas is optimized in terms of active control of three aspects including flue gas temperature,flue gas action time and flue gas dust,and the technology has been applied in two sets of 360 m~2 sinter machines of Xinyu Iron & Steel Co.,Ltd. The production practice shows that,the flue gas temperature,flue gas action time and flue gas dust have great effect on the sintering process indexes. When the flue gas temperature is kept at 250 ± 25 ℃,the flue gas acting time accounts for about 50% of the total sintering time and the content of dust in the flue gas is below 200 mg/m~3,the sintering utilization coefficient increases by 0. 01 ～0. 02 t/( m~2·h),the solid consumption reduces by 2. 33 ～ 2. 35 kg/t,the tumbler strength of sinter improves by 0. 50% ～0. 54%,the screening index decreases by 0. 12 ～ 0. 14% and the Fe O content reduces by 0. 36 ～ 0. 38%. Moreover,258 million Nm~3 hot exhaust emissions from each circular cooler are reduced every year.
In view of the problems of residue energy waste and environmental pollution caused by the external discharge of medium-low temperature flue gas from the circular cooler of sinter machine,by effectively combining the technical mechanism and process design for cyclic utilization of medium-low temperature flue gas,the cyclic utilization technology for residue energy of waste gas is optimized in terms of active control of three aspects including flue gas temperature,flue gas action time and flue gas dust,and the technology has been applied in two sets of 360 m~2 sinter machines of Xinyu Iron & Steel Co.,Ltd. The production practice shows that,the flue gas temperature,flue gas action time and flue gas dust have great effect on the sintering process indexes. When the flue gas temperature is kept at 250 ± 25 ℃,the flue gas acting time accounts for about 50% of the total sintering time and the content of dust in the flue gas is below 200 mg/m~3,the sintering utilization coefficient increases by 0. 01 ～0. 02 t/( m~2·h),the solid consumption reduces by 2. 33 ～ 2. 35 kg/t,the tumbler strength of sinter improves by 0. 50% ～0. 54%,the screening index decreases by 0. 12 ～ 0. 14% and the Fe O content reduces by 0. 36 ～ 0. 38%. Moreover,258 million Nm~3 hot exhaust emissions from each circular cooler are reduced every year.
引文
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[10]朱德庆,吴浩方,梅山烧结矿冷却废气热风烧结工艺的研究[J].烧结球团,1997,32(5):13-17.
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[2]蔡九菊,王建军,陈春霞,等.钢铁企业余热资源的回收与利用[J].钢铁,2007(42):1-7.
[3]董辉,王爱华,冯军胜,等.烧结过程余热资源回收利用技术进步与展望[J].钢铁,2014(49):1-9.
[4]徐国群.烧结余热回收利用现状与发展[J].世界钢铁,2009(9):31-35.
[5]刘传鹏,李国俊,林文佺,等.环冷机余热回收与利用系统的能量分析[J].钢铁,2015(50):60-66.
[6]景涛,周志安,黄后芳,等.唐山国丰230 m2烧结机热风烧结新工艺的应用[J].烧结球团,2016,41(4):11-14.
[7]邹琳江,李洪福,段锋,等.济钢热风烧结节能技术的实验研究[J].工业炉,2007(29):9-11.
[8]沈坷,张忠孝,代百乾.烧结余能综合回收利用技术研究[J].烧结球团,2010,35(6):1-4.
[9]张英,梁栋,何剑飞,等.热风烧结对烧结矿Fe O及碳耗影响的试验研究[J].新技术新工艺,2015(3)::89-91.
[10]朱德庆,吴浩方,梅山烧结矿冷却废气热风烧结工艺的研究[J].烧结球团,1997,32(5):13-17.
[11]范振宇.烟气循环烧结的基础研究[D].长沙:中南大学,2011.