WU Sheng-li
,
LIU Xiao-qin
,
ZHOU Qi
,
XU Jian
,
LIU Cheng-song
钢铁研究学报(英文版)
The reduction degradation characteristics of typical sinter, pellet and lump ore were tested with the reducing gas conditions simulating two kinds of iron-making processes. The results show that, in the same condition of gas composition and temperature, the reduction degradation degree (RDI＜3.15 mm) of sinter is high, RDI＜3.15 mm of lump ore is low and RDI＜3.15 mm of pellet is in the middle level. With two kinds of gas composition simulating different iron-making processes, the reduction degradation indices (RDI) of three kinds of iron ores all present the tendency of “inverted V-shape” in the temperature range from 450 to 650 ℃, and the RDI reach the maximum value at 550 ℃. The reduction degradation degrees of iron ores are extended when mixing the gas with hydrogen to increase the reduction potential, and the influence extent is discrepant for different iron ores. Colligating the increase amplitude of grains in small size fraction, the influence of reducing gas on lump ore is the greatest, the influence on sinter is the second, and the sensitivity of pellet on the reducing gas properties change is relatively small. As for the degradation form, lump ore and sinter both present the degradation of cracking, and the distribution of small grains generated from the cracking is in the range from 0.5 to 6.3 mm uniformly. The lump ore presents surface cracking, while sinter presents integral cracking. The pellet presents the degradation of surface stripping, and the proportion of grains smaller than 0.5 mm is the highest, which is up to 90% in the grains smaller than 3.15 mm.
关键词:
sinter
,
pellet
,
lump ore
,
low temperature reduction degradation characteristic
,
gas property
孙用军
,
董辉
,
冯军胜
,
张琦
,
王爱华
,
李磊
钢铁研究
doi:10.13228/j.boyuan.issn1001-0963.20130405
采用热力学分析法剖析了烧结余热产生、转换与利用过程,绘制了烧结-冷却-余热回收系统的物流图和(火用)流图,建立了有关能量输出、转换与利用的评价指标,借此研究了国内某360 m2烧结机的余热利用状况.结果表明:(火用)输出效率、(火用)转换效率、(火用)利用效率等指标可用来评价烧结余热回收等能量利用状况;烧结机、冷却机、余热锅炉、汽轮机发电4个环节的(火用)利用效率分别为0.30、0.52、0.71、0.39;目前烧结余热回收存在的主要问题是烧结烟气和冷却三段冷却废气所携带的显热尚未被利用;将烧结烟气和冷却三段废气余热用于点火煤气预热或锅炉给水预热,可使得烧结机和环冷机(火用)利用效率分别提高0.19和0.18.
关键词:
烧结
,
余热回收
,
热力学分析
,
(火用)
,
(火用)分析
董辉，林贺勇，，张浩浩，蔡九菊，徐春柏，周节旺
钢铁
对鞍钢某360m2烧结机进行了全方位的热工测试与分析，借此研究了中国大型烧结机余热资源的产生、转化、回收与利用过程。研究表明：生产1t烧结矿的燃料消耗为1612.13MJ，余热资源总量为1439.36MJ，能级为0.41。其中，烧结矿与烧结烟气的显热分别占70.87%和29.13%。余热资源中，得以回收的占40.29%。余热产生、转换、回收与利用过程中，由燃料化学转换为烧结矿和烧结烟气温度的损最大，其次是由烧结矿温度转换冷却废气温度的损，最后是由冷却废气温度转化为蒸汽的损。降低损最主要的因素是：减少烧结机和冷却机的漏风率以及设置适宜的冷却废气流量和冷却机内料层厚度。
关键词:
烧结
,
thermal test
,
waste heat
,
recovery
