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氧化球团链篦机-回转窑系统内衬长寿的实践 总被引:1,自引:0,他引:1
介绍了氧化球团链篦机-回转窑用耐火材料内衬的长寿化的实践,阐述了氧化球团链篦机-回转窑用耐火材料长寿化的实现途径,重点说明了回转窑窑体、链篦机预热段、环冷机下侧墙、环冷机受料斗等易损部位内衬结构的改进和新材料开发,同时介绍了氧化球团链篦机-回转窑系统的科学操作维护对内衬寿命的影响。 相似文献
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承钢链篦机—回转窑以煤为热源生产酸性球团,是当前国内自行设计、制造的一座生产球团矿的大型装置。目前利用系数达到3.785吨/米~3·日,日历作业率为80.92%;成品球团矿抗压强度2050.6牛顿/个球,转鼓指数(+5毫米)89.5%。初步显示了链篦机-回转窑球团生产工艺适应性强,容易操作,单机生产能力大和球团质量好等特点。文中对适宜的原料条件,链篦机的干燥和预热,以及回转窑内焙烧制鹰等进行了分析与讨论,并且提出了改进的技术措施。 相似文献
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链篦机-回转窑法氧化球团矿试验研究 总被引:5,自引:0,他引:5
在对程潮磁铁精矿和膨润土的物化性能,造球性能,生球爆裂温度,生球干燥和预热制度,球团焙烧制度进行实验室研究的基础上,进行了链篦机-回转窑焙烧扩大性试验研究,并对球团固结机理进行了研究,确定了生球干燥预热工艺,采用二室三段抽风鼓风相结合的干燥预热制度,采用预热球团入回转窑,焙烧温度为1250-1280℃,焙烧时间15min时,球团矿的TFe65.47%,FeO0.73%,抗压强度3040N/个,转鼓强度95.3%,磨损指数2.67%,球团矿的冶金性能良好。 相似文献
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竖炉用高质量球团是当前研究热点,回转窑球团产线中链篦机-回转窑-环冷机各部温度优化控制是提高球团产质水平的重要环节。介绍了链篦机-回转窑-环冷机设备优化过程以及造球工艺优化措施。首先在生产工序中缩短了干燥段,延长了预热段,同时改善了环冷机热量流通,为更好的氧化焙烧奠定了基础;在造球流程改造中,将造球盘角度统一调整为46°,旋转刮刀的转速均调整为10 r/min,旋转刮刀与底衬的距离调整为30~40 mm,造球盘落料点较之前向盘内延伸100 mm,小皮带下料点到边板距离达到43 cm,最终成球效果得到明显提升。对比工艺改进前后生产球团,其还原性能有所提升,还原膨胀及低温还原粉化指数均有所改善,其还原性能有所提升,还原膨胀率有所降低,其中1号球团还原膨胀率由12.34%降低到了7.82%,低温还原粉化指数改善明显,LTD+6.3均提高了20%左右。同时造球工艺优化为我国氢基竖炉用优质铁精矿球团提供了帮助。 相似文献
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Grate kiln is the major production process of oxidized pellets in China, its pellet output accounts for more than 60% of the total. However, some state parameters cannot be detected directly due to the continuous, closed, and high temperature characteristics of the production process, which brings difficulties to the process optimization. A soft measurement model for pellet temperature was established via dynamic modeling methods based on the principles of mass and heat equilibrium. And a thermal parameters optimization model, combined with the exergy balance analysis method, was proposed to optimize the operation parameters with the goal of minimizing the system wide exergy loss. The optimization results of practical cases show that the optimized thermal parameters are conducive to reducing the total exergy loss and fuel consumption and bring significant energy saving effects. A software system of thermal parameters optimization is developed via C#, which can show the energy distribution status in real time, estimate the energy consumption level, and provide operational guidance. This system has been applied in a domestic pellet plant and has played an important role in optimization guidance. 相似文献
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摘要:链箅机-回转窑是中国氧化球团生产的主要工艺,其产量约占球团总产量的60%以上,但由于其连续、封闭、高温的特点,生产过程部分参数无法实时检测,给工艺优化带来困难。因此,应用动态建模的方法,建立了基于物热平衡原理的球团温度软测量模型,再结合平衡分析方法构建了热工参数优化模型,以系统总损失最小为目标进行了参数优化。结果表明:采用优化后的热工参数,系统总损失和燃料消耗量降低,节能效果显著。通过C#语言开发了链箅机-回转窑热工参数优化软件,可实时呈现系统能量分布状态,评价能耗指标,指导生产操作。所开发的软件系统在国内某球团厂获得了应用,取得良好效果。 相似文献
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Aimed at the problem of ring-forming of 1. 2 million tons grate-kiln in the western district of Baotou steel, the influence of preheated and palletizing pellets crushing strength were investigated by using different technological parameters of grate. Aiming at improving the crushing strength of preheated pellets, the technological parameters of grate was optimized through orthogonal experimental. The results indicate under the condition of materials used in the experiment, the optimal technological parameters of grate are that, drying temperature of the second stage is 360??, preheating temperature of the first stage is 575??, preheating temperature of the second stage is 1000??, the belt speed of grate is 1. 5m/min, preheating temperature of the second stage influences the crushing strength of preheated pellets more significantly. 相似文献
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摘要:对链箅机回转窑工艺中各段球团样品进行实验分析,研究了氯元素和硫元素在链箅机回转窑工艺中的迁移规律,明晰了烟气中HCl的生成机制。结果表明,球团原料中的氯元素主要是以NaCl的形式存在,氯元素有一部分在链箅机抽风干燥段会转变成HCl气体并进入烟气,一部分在链箅机预热Ⅱ段之后以NaCl的形式汽化进入烟气,剩余的氯元素仍以NaCl的形式存在于成品球团矿中。烟气中的HCl气体是在抽风干燥段,由富含SO2的烟气与含水球团料层中的NaCl发生反应生成的,烟气中SO2转变成Na2SO4重新固定于料层中。在预热Ⅰ段和预热Ⅱ段,烟气中的SO2与原料中碳酸钙分解生成的游离CaO反应生成CaSO4,也会重新固定烟气中的SO2。 相似文献
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《钢铁冶炼》2013,40(5):321-326
AbstractDuring induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and cooling. The pellet bed is fired with downdraught firing leading to thermal gradients through the bed. Corex sludge, which is used as fuel in the pellet mix, supplies the necessary energy for uniform heating of the pellet. The physicochemical conditions, e.g. the temperature and oxygen partial pressure mainly depend on the amount of fuel incorporated in the pellet mix. As a result the percentage and the distribution of various phases in the pellets vary, leading to deviation in quality. To study the distribution of phases and their impact on cold crushing strength at different carbon levels (1·20 and 1·35%), pellets from different layers of the induration bed in an industrial straight grate were characterised. It was observed that the strength of the pellets varied from 142 to 268 kg/pellet and 128 to 245 kg/pellet across bed, with carbon 1·20 and 1·35% respectively. It was found that middle layer pellets had higher strength compared to top and bottom layers. It was observed that amount of hematite, magnetite, porosity and the pore size plays a significant role on the pellet strength. Pellets with 1·20% carbon showed better physical and microstructural properties across the pellet bed compared to pellets with 1·35% carbon. 相似文献
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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360m2烧结机的余热利用状况。结果表明:输出效率、转换效率、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利用效率分别提高0.19和0.18。 相似文献
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论述了采用链苒机-回转窑工艺生产氧化球团热工系统的基本特点和基本热工制度、风流匹配;分析了生球的在链算机内进行干燥、预热及氧化的各段合理温度要求、调节温度故障的措施和有效预防破坏性高温停机的对策;探讨了干球在窑内不同部位的焙烧温度、火焰操作以及窑头出现止压的预防和控制办法。同时,对采用2段鼓风式环冷机冷却时,热球达到允分氧化与完全冷却的风温、风世的匹配进行了优化。 相似文献
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通过对60万t球团生产线影响其产量及质量的诸多因素的分析,介绍了一系列改造方法:对辊筛系统的改造,以减少入窑粉子含量;对造球系统的改造,以提高台时产量;对链篦机小轴弯曲的问题加以解决,保证了生球在链篦机上的干燥预热;对回转窑溜槽和窑头的改造,减少了耐材的损坏,保证了生产的稳定顺行;对环冷机沙封的改造,解决了沙封频繁损坏的问题。改造后产量由年产60万t提升到80万t,球团矿质量也得到了明显的改善,同时降低了各种能耗,取得了显著经济效益。 相似文献
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针对转底炉生产存在产品金属化率低、冶炼能耗高、烟气含尘量大、生产效率低等问题.通过建立转底炉冶炼数学模型,计算了不同工艺参数对转底炉冶炼能耗的影响规律.结果表明:转底炉产品金属化率与烟气对含碳球团的二次氧化有关,增大还原区煤气供应量,可以减少含碳球团二次氧化,提高产品金属化率;助燃风预热温度和富氧率对冶炼能耗影响显著,提高助燃风预热温度和富氧率可以降低燃烧消耗,提高冶炼效率.助燃风预热温度每提高100℃,煤气消耗可以减少75 m3;助燃风富氧率达到20%时,煤气消耗量减少50%,烟气量减少57%. 相似文献