重钢1200m^3高炉焦丁回收系统工艺及效益

公司焦炭缺口大，影响高炉生产，槽下碎焦回收〉１０ｍｍ焦丁与矿石混装入炉，缓解焦炎不足的矛盾；同时使高炉顺行稳定，生产技术指标提高 。     

重钢高炉混装焦丁冶炼试验分析

本文通过对高炉混装焦丁冶炼试验的分析,研究了在重钢实际生产条件下,采用这项冶炼工艺的实用性,为增铁节焦开辟了一条新的途径。     

增加矿焦混装的焦丁用量对高炉操作的影响

在武钢8号高炉矿焦混装时,增加焦丁用量,料柱透气性得到改善,冶炼强度明显提高,产量增加;同时,煤气利用率也明显提高,达到48%以上,燃料比降低到499.1kg/t,取得了较好的经济效益。     

高炉焦丁混装入炉的效果与探索

杭钢750m^3高炉在炉况顺行的前提下，采用烧结矿与焦丁混装入炉，改善炉内的透气性，提高煤气利用率，达到了增产节焦的效果，并对焦丁的适宜加入量进行了进一步的探索。     

攀钢高炉焦丁混装入炉生产实践

介绍了攀钢高炉开展矿石、焦丁混装入炉的研究和生产情况 ,焦丁回收混装入炉设施充分利用了本厂现有设备 ,工程投资少见效快。用焦丁代替冶金焦与矿石混装入炉不但节省焦炭降低生产成本 ,而且有利于钒钛矿冶炼 ,使高炉稳定高产。     

锰铁高炉炉顶布料及矿焦混装

大小料批布料和矿焦混装已有很多报导，这两种方法对节焦都取得了较好的效果，锰铁高炉试验结果也不例外，但坚持者不多，也许是工艺不完善，操作麻烦，效果不稳定，或者认为铁高炉煤气能利用不像生铁高炉那样重要，所以笔者认为有强调的必要。     

高炉矿焦混装的实践与研究

本文重点回顾了马钢在矿焦混装方面的工作,并在此基础上提出了混装引起的课题与思考。笔者认为,矿焦混装是对传统层装料制的突破,必将在技术上理论上引起连锁反应.诸如矿煤混装,采用两种焦炭冶炼、将矿焦混合工序移到原料场或其它适当场所,以及在高炉冶炼理论上如何看待高炉内各种物料之间的关系等等.     

Qi式炉顶装置的设计与研究

“Ｑｉ”式炉顶集中心加焦,矿焦混装和矿焦层装三项装料于一体,用其装料,可实现高炉料柱中的焦炭呈“塔松”状充填结构分布,形成高大的倒Ｖ型软熔带,确保足够,稳定的中心煤气流和较为理想的煤气分布,以达到强化冶炼,改善各项技术经济指标和延长高炉一代寿命等目的。     

Effect of nut coke on the reduction behavior in iron-making blast furnace

Ore-coke mixed charging is a potential technique for optimizing the charging pattern. Recently,the charging of small-sized coke( nut coke) with the ferrous burden layer has been applied to reduce rawmaterial usage and decrease costs. Various studies indicate that mixing nut coke with ferrous burden can enhance the reduction kinetics,improve the softening and melting properties,and have a positive effect on the permeability. Although mixed charging,especially the addition of nut coke to the burden layer,has been used in the industry for various reasons,the mechanisms and side effects for using nut coke are not well understood,and the mixing ratio remains limited in actual blast furnace operation.High-temperature experimental studies were conducted to increase the understanding of the complex process of reduction,softening and melting properties,and permeability in a blast furnace when mixing nut coke with an ore layer. The effect of the nut coke mixing ratio and nut coke size was investigated under various reducing conditions.To describe the reduction processes of burden materials,numerous experiments were interrupted at different stages of the reduction,and the collected materials were examined by using image analysis. The reduction degree of mixed charging( iron ore mixing with nut coke) was improved when using nut coke at the temperatures of 800 ℃ and above. The reaction rate of ore-nut coke mixed charging was higher than that of standard charging without the use of nut coke.     

小块焦对高炉焦比的影响

在高炉冶炼过程中小块焦一直被认为只是作为资源再利用,使用时常常不被看好。通过实验室的探索性研究,了解到小块焦的粒度效应对其失重率作用很大,小块焦的反应性相对于冶金焦有很大的提高。可以认为小块焦在炉内改善了还原性,有促进矿石还原作用。小块焦的大量气化吸热有降低热储备区温度的倾向,对高炉的燃料消耗进一步降低起了一定作用。750 m3高炉的生产性试验结果表明,提高小块焦的用量有利于燃料消耗的降低,其他工艺参数不变,增加1 kg/t的小块焦相当于置换焦比1.19 kg/t。     

超大型高炉风口焦炭取样分析研究

为恢复炉况及探讨超大型高炉冶炼规律,对首钢京唐公司高炉进行了风口焦炭取样分析,研究了其入炉焦炭热强度与焦炭反应性、焦炭冷强度与焦炭耐磨强度之间的关系;探明了风口焦炭的粒度、劣化度及渣铁滞留量;探索了渣铁滞留量与渣铁体积、风口焦炭粒度、煤比及炉渣二元碱度的关系;分析了炉缸径向焦炭粒度分布、风口前高透气性区长度、炉缸透气性等;根据上述研究结果,提出了高炉操作建议并得到应用。实践结果表明:风口焦炭取样分析可以作为高炉操作调整的重要参考。     

武钢5号高炉取消中心加焦工业试验

为探索降低高炉燃料比的途径,在保证炉况稳定顺行的前提下,武钢5号高炉进行了取消中心加焦的工业试验。结果表明:取消中心加焦需要较好的高炉原燃料条件,取消中心加焦后,煤气利用率平均提高2.61%,燃料比平均降低14kg/t,焦比平均降低12.7kg/t。     

Experimental study on the effect of using nut coke on the permeability of packed beds in blast furnaces

The charging pattern may affect blast furnace permeability,coke ratio,and the freedom to select low-grade raw materials. Ore-coke mixed charging is a potential technique for optimizing the charging pattern. In recent years,charging small-sized coke( nut coke) into the burden layer has been applied to save raw materials and decrease cost.Although mixed charging,especially adding nut coke into the burden layer,may have many advantages,the mechanisms and side effects of nut coke use are not well understood,and the mixing ratio is still limited in industrial blast furnace operation. In this study,the status of mixed charging,especially nut coke used in blast furnaces,was investigated. A cold flow model was established to study the permeability of the packed bed in the blast furnace "dry zone"under different conditions with the aim of better understanding the mechanisms of mixing coke and nut coke into the burden layer. The effect of coke size,mixing coke ratio,layer numbers,and gas flow rate on the pressure drop of the packed bed was investigated. The experimental results show that mixing the nut coke in the ore layers decreases the pressure drop to different extents depending on mixing ratio.     

Effect of coke reactivity and nut coke on blast furnace operation

Abstract

Two measures for coke saving and increase in blast furnace efficiency related to coke characteristics – reactivity and size – are discussed in this paper. Modern blast furnace operation with low coke rate and high injection rate causes a change in coke quality requirements. A discussion has arisen recently about highly reactive coke. Here, a theoretical analysis of influence of coke reactivity on the thermal reserve zone, direct reduction and carbon consumption in the blast furnace has been undertaken. Experiments have been performed using non-standard test scenarios that simulate coke behaviour under real blast furnace operating conditions. Coke reactivity and microstructure have also been investigated under the impact of alkali and pulverised coal ash and char. Operation of many blast furnaces has proved the possibility of coke saving and increase in productivity when using small-sized coke (so-called nut coke) mixed with the burden, but the reasons for this phenomenon, and consequently the limit for nut coke consumption, are still not very clear. An analytical method and cold model simulations have been used to quantify the change in shaft permeability and furnace productivity when using nut coke.     

高炉入炉焦炭高温反应特性的研究

焦炭的热态性能是评价其在炉内溶损反应程度及抗机械破坏作用的重要指标之一.通过对安阳钢铁1#和2#高炉入炉焦炭的高温反应特性,分别采用块焦法、粒焦法和组织结构法进行了测定,并对所得结果进行了对比,分析了不同测定方法测定结果的侧重点及内在影响因素,给出了粒焦法和块焦法所得结果之间的线性关系;焦炭的矿相显微结构是影响其在高炉内劣化的内部因素,由修正公式可知,片状结构和各向同性与CO2的反应速度较快,镶嵌结构含量高的焦炭,反应后强度较高.由安钢1#和2#高炉所用入炉焦炭的性能分析结果,结合高炉的实际生产情况,提出了改进安钢高炉入炉焦炭高温反应特性的措施.     

影响包钢高炉入炉焦炭强度原因浅析

主要针对包钢高炉炉料冶金性能的特殊性,重点分析影响包钢高炉焦炭强度的原因,找出进一步降低高炉焦比的有效措施。     

450m^3高炉混喷烟煤降低焦比的生产实践

西钢450m^3高炉在高强度冶炼的生产状态下,为降低焦比,合理采用烟煤和无烟煤混合喷吹的措施,有效降低了炼铁成本,取得了显著的经济效益。