基于离散单元法的烧结环冷机给料方式研究
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摘要
针对烧结矿在环冷机内横、纵向粒度偏析不合理的问题,采用离散单元法对环冷机给料方式对烧结矿偏析分布的影响进行了研究。结果表明,在料斗内增设导料板A、B、C的方法可将原有的正交给料改为逆向给料,使台车宽度方向上83%的范围内,烧结矿粒度偏析指数降幅由0. 41缩小至0. 15,烧结矿在台车横向上分布更加均匀;逆向给料可将台车上部烧结矿粒度偏析指数降低为0. 98,下部偏析指数增加为1. 04,形成了小粒度烧结矿多集中在上部,大粒度烧结矿多集中在下部的"小—中—大"床层结构,更有利于烧结矿床层的换热。
In order to solve the transversal and longitudinal size segregation of sinter in circular cooler,the influence of the feeding mode of the circular cooler on sinter segregation distributionwas studied by the discrete element method. The results shows that,the original perpendicular feeding is changed to the reversed direction feeding by adding the guide plate A,plate B,plate C in material hopper,and within the range of 83% in the pallet width direction,the drop of sinter size segregation index is from 0. 41 to 0. 15,which makes the transversal distribution of sinter on the pallet more even. The reversed direction feeding can decrease the upper sinter size segregation index to 0. 98 and increase the lower segregation index to 1. 04,the "small-mediumlarge"bed layer structure is formed,in which most of small size sinter are concentrated on the upper layer while most of large size sinter are concentrated on the lower layer,and the structure is more favorable for sinter layer heat exchange.
In order to solve the transversal and longitudinal size segregation of sinter in circular cooler,the influence of the feeding mode of the circular cooler on sinter segregation distributionwas studied by the discrete element method. The results shows that,the original perpendicular feeding is changed to the reversed direction feeding by adding the guide plate A,plate B,plate C in material hopper,and within the range of 83% in the pallet width direction,the drop of sinter size segregation index is from 0. 41 to 0. 15,which makes the transversal distribution of sinter on the pallet more even. The reversed direction feeding can decrease the upper sinter size segregation index to 0. 98 and increase the lower segregation index to 1. 04,the "small-mediumlarge"bed layer structure is formed,in which most of small size sinter are concentrated on the upper layer while most of large size sinter are concentrated on the lower layer,and the structure is more favorable for sinter layer heat exchange.
引文
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[12] Xu Y,Xu J,Sun CF,et al. Quantitative comparision of binary particle mass and size segregation between serial and parallel type hoppers of blast furnace bell-less top charging system.[J]. Powder Technology,2018(328):245-255.
[2]蔡九菊,王建军,陈春霞,等.钢铁工业余热资源的回收与利用[J].钢铁,2007,42(6):1-7.
[3]李宗平,范晓慧,孙英,等.烧结环冷机余热发电的风量优化配置[J].烧结球团,2016,41(1):52-56.
[4]张进坤,杨继刚.莱钢400 m2烧结机提高余热发电量的改造[J].烧结球团,2015,40(3):14-21.
[5] Feng HJ,Chen LG,Liu X,et al. Constructal optimization of asintercooling process based on exergy output maximization[J]. Applied Thermal Engineering,2016,96(5),161-166.
[6] Liu Y,Yang J,Wang J,et al. Energy and exergy analysis for waste heat cascade utilization insintercooling bed[J]. Energy,2014,67(1):370-380.
[7]石江山,樊统云,裴元东,等.环冷机配风技术在京唐烧结的应用[C]//第十届钢铁学术年会,2015:1-10.
[8]张新杰.环冷机给料方式的探讨[J].烧结球团,1997,2(3):54-56.
[9] Nakano M,Abe T,Kano J. DEM analysis on size segregation in feed bed of sintering machine[J]. ISIJ International,52(2012),1559-1564.
[10] Ishihara S,Soda R,Zhang Q. W. Dem simulation of collapse phenomena of packed bed of raw material for iron ore sinter during charging[J]. ISIJ International,2013(53):1555-1560.
[11] Mio H,Kadowaki M,Matsuzaki S,et al. Development of particle flow simulator in charging process of blast furnace by discrete element method[J]. Minerals Engineering,2012(33):27-33.
[12] Xu Y,Xu J,Sun CF,et al. Quantitative comparision of binary particle mass and size segregation between serial and parallel type hoppers of blast furnace bell-less top charging system.[J]. Powder Technology,2018(328):245-255.