唐钢3号高炉风口频繁破损的对策

对唐钢3号高炉风口损坏的状况及原因进行了分析,重点对风口损坏的对策进行了总结。3号高炉风口损坏最主要的原因是风口的工作环境恶化,风口前端渣铁、焦炭相对运动的动态平衡被打破,导致风口寿命大幅度缩短。通过采取提升焦炭质量、减轻有害元素的富集、杜绝铁水温度过低、稳定边沿气流及优化出铁制度等对策,3号高炉风口破损状况明显改善。     

邯钢3200m3高炉风口损坏原因及对策

对邯钢3200m3高炉风口大量破损的原因及对策进行了分析总结.通过提高焦炭质量,改进休风装料制度和操作制度,风口烧坏数量大大减少,取得了较好的效果.     

舞钢1260m3高炉风口下沉的应对措施

2019年10月,舞钢1260 m3高炉开始出现风口小套频繁下沉现象,多个风口不能喷煤,严重时造成小套进出水管断裂,造成高炉多次无计划休风.认为炉墙结厚、渣皮脱落和操作因素是造成风口下沉的主要原因.通过采取调整布料制度、在风口增加机械顶杆、热洗炉等措施,2020年1月1日以后,风口在使用周期内没有再出现下沉的情况,高炉...     

COREX-3000风口破损的原因分析和对策

宝钢1#COREX-3000投产以来,风口破损较为频繁,对COREX-3000生产的稳定及产量带来了很大的影响。从COREX纯氧鼓风工艺特点、风口氧气流速、单风口熔炼率、风口通氮、出铁制度、焦炭比例和生产工况等方面进行了分析,分析结果显示,COREX风口破损的主要原因是由于风口理论燃烧温度高,风口前端焦炭和半焦粒度小,透气透液性能较差,导致风口前端氧气孔道高温熔化或磨损扩孔,出现漏水现象而破损。通过适度降低风口氧气流速和单风口熔炼率、风口添加氮气、稳定炉况和优化出铁制度可以有效减少风口破损数。     

唐山国丰1780m~3高炉开炉实践

高炉中、大修后的开炉,对开炉料的计算及实际使用、热风温度的选择梯次、风口面积的大小均有严格要求,正确的送风制度、合理的热制度对于高炉快速达到生产指标、降低开炉成本、延长高炉一代炉龄、高炉高产低耗等有重要影响。介绍了国丰1 780 m3高炉中修后开炉,开炉前风口布局及堵风口情况,装枕极开炉料的配料与装料,高炉的开炉操作(包括送风制度、装料制度、炉缸热制度、渣铁排放)。开炉历时7天,高炉就基本达到了正常生产水平。     

南（昌）钢1050m^3高炉短期使用小风机冶炼实践

对南钢1050m3高炉短期使用小风机冶炼实践进行了总结.其主要操作经验是堵风口、装料制度操作与送风制度制度的调整.     

梅钢3号高炉风口双枪喷煤技术的应用

对梅钢3号高炉风口双枪喷煤技术的应用进行了总结.通过对喷煤工艺及没备的改造,采用了风口双枪喷煤技术,并结合高炉上下部制度的调整,使3号高炉的煤比提高了10kg/t.     

高炉强化冶炼技术攻关

对孝义城钢432m^3高炉强化冶炼技术攻关进行了总结。针对高炉存在的问题，在分析原燃料和设备等状况的基础上，应用对比分析的方法制订合理的操作方针。采取了洗炉及使用斜风口；调整风口布局并控制适宜压差、制定防止连续塌滑料预案、提高风温使用水平、摸索合适的装料制度、调整冷却制度等强化管理措施，使高炉风口烧坏现象大幅度减少，经济技术指标明显改善。     

邯钢7号高炉风口频繁损坏的原因及对策

对邯钢7号高炉风口频繁损坏的原因及对策进行了总结。在处理炉缸局部温度过高问题后,7号高炉开始出现风口频繁损坏现象。风口频繁损坏的主要原因,一是原燃料条件变差,二是两厂家风口质量存在差异,三是送风制度、热制度与炉前出铁制度等操作制度存在问题。通过采取一系列有效对策后,高炉持续风口频繁损坏的现象得到有效抑制,炉况得以改善,主要技术经济指标恢复到较好水平。     

风口布局对高炉炉况的影响

送风制度是高炉操作的基本制度,它包括风量大小、风口直径与长度、风口的布局、风温的高低、喷吹量的多少等。在一定的条件下,风口布局也很重要,它对炉况的顺行会产生很大的影响。生产实践表明,以风口布局来调整风口进风量的大小,是调节高炉炉况的手段之一。下面,根据鞍钢六高炉风口布局的变化,来讨论风口布局对高炉冶炼的影响。分四个阶段来比较,见表1所示。第一阶段(1977年6月1日至30日):     

攀钢钒新3号高炉年修开炉快速达产实践

攀钢钒新3号高炉检修后开炉采用快速烘炉、炉底多点立体点火、快速转换装料制度、快速扩大进风面积等技术,点火开炉后加风顺利,炉缸活跃。通过制定科学的开炉方案,保留烘炉导管开炉,加风口圈调整进风面积,优化料制,合理控制边缘和中心气流等措施,确保高炉快速达产,高炉利用系数3天达到2.015t/(m3·d)。此次实践是目前国内外2000m3级冶炼钒钛磁铁矿高炉开炉中最成功的一次。     

使用折流式风口小套的生产实践

新恒基钢铁水泥总厂自１９９３年２月份开始，把高炉用空腔式和双腔式和双室风口小套改为流式专利风口小套之后，风口寿命提高了３倍，年经济效益境长百万元，本文对上述风口小套的结构做了具体剖析。     

Study of the combustion behaviour and temperature of pulverised coal in a tuyere zone of blast furnace

The combustion behaviour and temperature of pulverised coal in a tuyere zone of the blast furnace could benefit to adjust the operation parameters, assure the stable state as well as maintaining high quality of hot metal of the blast furnace. However, there have been rare studies about this subject. In this paper, the digital imaging system based on the colour charge coupled device within gas-cooling and dustproof functions was established to capture the combustion radiation in the tuyere zone. For instance, images of tuyere zones of 2000 and 2500?m³ blast furnaces were detected through a peephole in front of the blowpipe by the application of digital imaging and image processing techniques, and the temperature distributions were also calculated. Some measurements were used to improve the accuracy of the results, and the combustion behaviour was also analysed.     

A novel method to detect the water leakage from tuyere nose cooling circuit in blast furnace

The water cooled tuyere noses, through which hot blast is blown into the furnace, are exposed to very high temperature region of raceway inside the furnace. As a result the chances of rupture of cooling pipes within the tuyere nose are significantly high. The rupture causes water dripping into the furnace and if it continues and unnoticed for a prolonged period it lowers down the local raceway temperature and thus adversely affects the product hot metal and slag quality. Moreover, with heavy water leakage, there is a danger of explosion; monitoring of the cooling water is therefore essential. Despite the availability of water flow metre at each tuyere it is difficult to identify the leaking tuyere at the early stage unless the rupture size grows bigger and so the leakage. In several cases the furnace is forced to shut down to manually inspect the leakage occurring without prior knowledge of the exact tuyere number. Identification of water leakage at an early stage is therefore necessary to prevent process disturbances due to chilling of the furnace and avoid the unscheduled downtime for tuyere replacement. This paper presents a method to identify the water leakage from tuyere nose cooling circuit in blast furnace and the adverse effect of water leakage on the performance of the blast furnace. A system called water leak detection system is developed for different blast furnaces in Tata Steel Jamshedpur to monitor the water leakage through tuyere nose and identify the exact leaking tuyere based on a dimensionless number called leak detection factor.     

一种新型高炉风口中套压紧装置的设计与应用

针对天钢3 200 m~3高炉风口大套前端锥面与风口中套上端锥面之间煤气泄漏的问题,通过对风口装置进行结构分析和现场跟踪实测,在风口中套的另一端设计安装了一套中套压紧装置。该新型压紧装置投入使用后,保证了高炉风口装置的安全稳定运行,减少了设备损失,创造了较高的经济效益。     

合理调整高炉风口参数的数学模型及措施

 合理调整风口对大型高炉吹透中心、活跃炉缸十分重要。目前,实际操作常常认为增加风口长度、增加风口回旋区深度、缩小风口面积能提高风速,进而提高鼓风动能,以利于吹透中心。建立了调整风口参数的数学模型,并以某厂3 200 m3高炉为例,给出了在总风量不变的条件下,增加1个风口长度、减小1个风口面积以及多个风口尺寸调整时,各风口风量、风速和鼓风动能的变化。发现增加部分风口的长度时,对应风口风量、风速、鼓风动能降低。缩小少数风口的面积,会降低对应风口的风量;只有在缩小多数风口的面积时,已调整的风口风速和鼓风动能才可能提高,而未调整的风口风量、风速和鼓风动能提高幅度更大。根据该数学模型,定量化给出该高炉调整风口的相关参数,可用于调整炉缸煤气流的均匀性,维持高炉稳定、顺行。     

水钢 2 500 m3高炉炉缸堆积治理实践

通过对水钢 2 500 m3高炉炉缸堆积的成因进行分析,并对炉缸堆积治理过程进行总结,在优化装料制度的基础上,通过采取开放中心和稳定边缘煤气流、增加中心焦比例、缩小中心焦角、加组焦、提炉温、堵风口、改用长风口以及用锰矿和萤石洗炉等措施,使高炉生产逐步恢复正常,技术经济指标改善。     

Tuyere failure analysis in Corex process

Abstract

Corex is an alternative smelting reduction ironmaking process where non-coking coal and pure oxygen is used instead of coke and air. The temperature of the tuyere region is much higher than in a blast furnace, and sustainability of tuyeres is a major challenge. At JSW Steel Ltd, almost 15% of the total shutdown is due to burnt tuyere replacement. A detailed analysis of tuyere failure and process parameters effecting tuyere burning was conducted to understand the failure mechanism and the root causes. A common reason does not exist for all types of tuyere failure; however, the collective reasons for failure are excessive coal fines (–6·3 mm) and small mean particle size, low back pressure, blocking of tuyeres, scab formation and slip.