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·煤焦技术·
燃料与化工 Fuel & Chemical Processes
入炉煤水分调节对焦炭指标及升温的影响
张雪红薛改凤詹立志任玉明
(武汉钢铁(集团)公司研究院炼焦煤利用湖北省重点实验室,武汉430082)
Jul. 2015 Vol. 46 No.4
摘要:研究了人炉煤水分对焦炭冷热强度、粒度等的影响。比较了同高度装煤及同干煤量不同高度装煤条件下焦饼中心温度的差异。试验结果表明,当入炉煤水分减少时,干基成焦率提高,但焦饼收缩率降低,焦炭冷热强度改善,尤其是焦炭反应后强度提升明显,焦炭粒度呈减小趋势,焦炭均勾性改善;在保持相同干煤量的情况下,水分越少,升温速度越快。
关键词:入炉煤水分;焦炭冷强度:焦饼中心温度
中图分类号:TQ520.61
文献标识码:A
文章编号:10013709(2015)04000804
Influence of moisturecontent in coal charge to coke indexes and temperature rising
Zhang Xuehong Xue Gaifeng Zhan Lizhi Ren Yuming( Research Institute of Wuhan Iron and Steel ( Group) Company ,
Hubei Provincial Key Laboratory of Coking Coal Utilization, Wuhan 430082, China)
Abstract : The influence of moisture content in coal charge to the cold and hot strength and grain size is studied. This paper compares the difference of center temperature of coke cake from same dry coal but different coal cake height. The experiment result shows that as the moisture content reduces, the dry basis coke rate increases,but the shrinkage rate of coal cake decreases ,the cold and hot strength of coke are improved, especially the coke strength after reaction is improved remarkably, the coke grain size decreases and uniformity of coke is getting better. Under the condition of same dry coal, temperature of coke cake at the center rises faster as the moisture content decreases.
Key words : Moisture content in coal charge: Cold strength of coke: Center temperature of coke cake
我国项装焦炉常规入炉煤水分大多在10%左右,水分较高。对人炉煤的水分进行调整,有利于稳定焦炉操作、降低炼焦耗热量、改善焦炭质量。煤调湿(CMC)技术将入炉煤水分降至6%~8%,有利于入炉煤密度增大,焦炭及化工产品增产,焦炉加热用煤气量减少,焦质量提高和焦炉操作稳定[2.3]。但CMC技术在生产中存在警端,会出现装煤口目烟、冒火,上升管和炭化室墙结石墨增加,焦油渣增多,煤气净化系统堵塞等问题4]。微粉预成型(DAPS)工艺,将水分降至2%以下,再分离出煤粉压制成型煤,与粗煤粒混合装炉(5,6)。该技术解决了低水分高细度煤的装炉问题,且可通过增加弱黏收稿日期:201405-30
作者简介:张雪红(1979-),女,工程师
煤配人量维持内部合适的膨胀压力[5.7]。目前国内生产应用以CMC技术为主,但该技术在我国较多钢厂应用并不成功,还有很多工作需要完善"],而 DAPS工艺仍处于研究阶段。
本文针对不同水分条件下的装煤状况、焦饼中心温度、焦炭关键指标等方面,研究水分对炼焦的影响。
试验 1
1.1原料
试验原料包括人炉煤(配合煤)和单种煤,入炉煤粒度控制为<3mm,煤质指标见表1。