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针对天铁新区2 800 m3高炉喷煤系统在高浓度直接喷吹过程中出现的过滤器堵粉和泄漏、速率波动大等问题,通过采取改造煤粉过滤器、调整工艺运行参数等措施对其进行优化,确保了煤粉的稳定喷吹,使每小时喷煤量误差率稳定控制在±3%范围内,瞬时喷吹速率稳定,波动幅度小,为高炉炉况顺行创造了条件. 相似文献
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由于自动控制数学模型精度低,安钢高炉喷吹煤粉系统一直未能很好地实现自动喷吹,喷煤量波动较大,严重地影响了高炉炉况顺行和喷煤水平的提高.通过对现场采集的大量实验数据进行整理、分析与研究,提出喷煤量分别与罐压、补气量之间的可能关系,建立两种情况下的二维控制数学模型,对一元回归方程进行误差分析,将计算结果与实测值进行比较,分析了产生误差的原因,并验证该数学模型的正确性和适用性. 相似文献
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安钢高炉喷吹煤粉系统 ,由于自动控制数学模型精度低 ,一直未能很好地实现自动喷吹 ,喷煤量波动较大 ,严重地影响了高炉炉况顺行和喷煤水平的提高。通过对现场采集的大量实验数据进行整理、分析与研究 ,提出喷煤量分别与罐压、补气量之间的可能关系 ,建立其在三维情况下的数学模型 ,在MATLAB环境下 ,作出其三维拟合曲面。利用二元回归方程计算结果与实测值进行比较 ,判断三维数学模型的显著性 相似文献
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喷煤罐是用压缩气体向高炉喷送煤粉的重要压力设备。喷煤罐罐爆事故的发生,直接影响高炉的均匀喷吹、炉况顺行,同时浪费能源、污染环境和损坏设备,对人身安全也造成威胁。1987年4~6 相似文献
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一、概况 南昌钢铁厂现有二座高炉进行生产(1号高炉255m~3,2号高炉300m~3),1989年建成喷煤系统(见图1),采用了目前国内较为通用的双罐交替高压喷吹工艺,设计生产能力为两座300m~3,高炉利用系数达到2.0时喷吹量可达到120~150kg/t。 喷煤投产初期,由于高炉全生矿冶炼,炉况顺行条件极差,喷吹量一直只能维持在40kg/t以下。1991年80型焦炉和18m~2烧结机相继投产,高炉原、燃料条件逐步好转, 相似文献
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高炉喷吹煤粉的适宜操作范围 总被引:2,自引:0,他引:2
为了降低高炉焦比,节约能源,通过首钢一高炉大量喷煤操作情况的分析,提出了高炉喷吹煤粉的适宜操作范围.无富氧喷煤量可达150kg,富氧时可达200kg以上.为提高喷煤效果,应注意维持适当的风口前理论燃烧温度和氧气过剩系数.大量喷煤后压差略有升高,但不影响高炉顺行.与炉腹喷吹还原气相比,风口大量喷煤是一种经济、有效的节焦方法. 相似文献
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结合理论研究及生产实践,分析了进一步提高喷煤量的限制因素和技术问题,提出了在焦炭、含铁炉料、鼓风、喷吹工艺及操作等方面的解决措施.同时指出,应努力寻求具体冶炼条件下最适宜的喷煤量. 相似文献
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针对天钢3 200m~3高炉的生产状况和原燃料情况,对影响喷煤比的原燃料情况、热风温度、煤粉情况、富氧、加湿鼓风、炉顶压力、混合喷吹以及炉内操作情况等限制性因素进行分析。结合天钢3 200 m~3高炉的实际情况,提出了提高煤粉燃烧率的多项措施,提高了高炉喷煤比,降低了焦比和炼铁成本。 相似文献
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为改善高炉冶炼效果,采用两段卧式燃烧炉模拟实际高炉喷煤工艺条件,系统研究了不同条件下富氧喷煤对煤粉燃烧过程的影响.在热风富氧的条件下,单种煤和混合煤的燃烧率随富氧率的增加都有提高,而且无烟煤燃烧率的提高幅度略高于烟煤. 缩小煤粉粒度、提高热风温度都有利于煤粉燃烧率的提高,但在鼓风富氧率比较高和煤粉粒度较细小时,煤粉粒度的变化对煤粉燃烧率的影响比较小,混合煤粉的燃烧率随热风温度升高而提高的幅度也略微下降. 相似文献
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优化配煤结构 降低配煤成本 改善焦炭质量 总被引:3,自引:0,他引:3
论述了近年来鞍钢进行的优化配煤结构的科研工作。以焦炭在高炉中劣化过程的研究为依据,转变对焦炭质量指标和配煤技术的认识。在配煤中,多配多价格较低的瘦煤和低灰、低硫的1/3焦煤;减少价格较高的强粘结性焦煤和肥煤的比例,使配煤原料成本大幅度降低,焦炭灰分下降。鞍钢1999年焦炭质量达到历史最好水平。同时炼铁高炉主要技术经济指标也达到历史最高水平。 相似文献
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Abstract: Pulverized coal injection (PCI) is a key technology in modern ironmaking by blast furnace (BF) and the life of injection lance has a great influence on PCI operation and on normal running of blast furnace. It is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in BF. The outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis. A mathematical model for calculating the temperature of common monocular coal lance had been developed according to the principles of mass and energy balance. Increasing temperature and flow velocity of the hot blast would cause a rise in the lance temperature. The influence of hot blast temperature is more obvious. The lance temperature would decline when compressed air flux increases. Conveying technology of dense phase pulverized coal is beneficial to extending lance′s life because decreasing solid-gas ratio would intensify erosion and burning loss. The anti-oxidation temperature of lance materials needs to be over 1000 ℃ for BF intensified smelting. In order to increase the resistance to oxidation of the coal lance′s outer surface, oxidation-resistant steel or Al coating stainless steel is the appropriate material for BF use. Employing the metal surface treatment technology to enhance the hardness of the coal lance′s internal surface could prolong the service life of coal lance. 相似文献
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In order to understand the complicated phenomena of pulverized coal injection (PCI) process in blast furnace (BF), several mathematical models have been developed by the UNSW and BSR cooperation. These models are featuring from coal combustion in a pilot‐scale test rig, to coal combustion in a real BF, and then to coal/coke combustion in a real BF, respectively. This paper reviews these PCI models in aspects of model developments and model applicability. The model development is firstly discussed in terms of model formulation, their new features and geometry/regions considered. The model applicability is then discussed in terms of main findings followed by the model evaluation on their advantages and limitations. It is indicated that the three PCI models are all able to describe PCI operation qualitatively. The model of coal/coke combustion in a real BF is more reliable for simulating in‐furnace phenomena of PCI operation qualitatively and quantitatively. Such model gives a more reliable burnout prediction over the raceway surface, which could better represent the amount of unburnt char entering the coke bed. These models are useful for understanding the flow‐thermo‐chemical behaviours and then optimising the PCI operation in practice. 相似文献
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The carbon mass fraction of blast furnace (BF) dust (gravitational dust and sludge) was determined under normal production conditions in industrial tests. The mass fraction of unconsumed coal and coke particles in BF dust at different PCI rates was obtained based on microscopic and chemical analysis. A relationship between PCI rate and mass fraction of unconsumed coal in BF dust was derived. The amount of unconsumed coal and coke particles in BF dust at different PCI rates was obtained. The utilization factor of injected pulverized coal into BF was determined under different PCI rates at Baosteel. This result provides a necessary analysis method at large PCI rate in BF. 相似文献