共查询到18条相似文献,搜索用时 156 毫秒
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根据现场的实际情况,建立了阳极焙烧的热工模型,采用数值模拟的方法对焙烧曲线进行了优化研究,模拟了不同焙烧曲线对阳极温升过程、终焙温度和内外温差的影响,结果表明:在其它参数一定的情况下,随着火焰周期的延长,阳极中心的温升曲线逐渐右移,终焙温度逐渐升高,阳极的内外温差逐渐缩小;随着火焰周期的降低,各焙烧阶段的阳极平均升温速率升高,阳极的保温时间逐渐减少.从数值模拟结果来看,最优的焙烧曲线是火焰周期为30h的焙烧曲线. 相似文献
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国外阳极焙烧炉火道墙寿命能达到140个火焰循环,按30小时一个火焰循环周期、每个火焰系统18室来计算,火道墙寿命约为8.6年。而国内焙烧炉火道墙寿命普遍较短,70~80个火焰周期,即4年左右。焙烧工艺追求的目标包含焙烧质量、燃气单耗、烟气排放效果、火道墙寿命、效率等,而炉况又直接影响焙烧质量、燃气单耗、排气排放效果。故对炭阳极工厂而言,焙烧炉是最重要的设备。本文从焙烧炉设计到工艺操作等分析影响火道墙寿命的各要素,并提出延长寿命的相应措施及建议。 相似文献
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阳极焙烧炉节能的途径 总被引:4,自引:1,他引:4
指出结构设计是阳极焙烧炉节能降耗的关键。有了合理的炉体结构,再配以自动控制系统,合理的焙烧周期等条件,就能降低能耗。本文从炉体结构设计、挥发份燃烧、固体蓄热回收、炉体漏风和控制方法等方面,介绍了降低阳极焙烧炉能耗的途径,以及一些有效的操作方法。 相似文献
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介绍了利用新型立装敞开式阳极焙烧炉焙烧阴极炭块的相关技术.在实际生产过程中,经过焙烧曲线优化和加强炉面燃烧管理,改进装炉质量等措施,利用阳极焙烧炉是可以生产出性能指标与外观质量合格的阴极焙烧块.其经济技术指标优于阳极焙烧块,与带盖有火井式阴极焙烧炉生产相当. 相似文献
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指出要提高预焙阳极的质量 ,首先要保证原料的质量 ,提高煅烧质量和糊料配料质量以及配入最佳的优质粘结剂。在焙烧工序中 ,焙烧炉的设计和焙烧的合理升温曲线及温度 ,能实现自动控制的先进的燃烧装置 ,是生产高质量阳极的有效保证 相似文献
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在实验室制备各类AlF3掺杂试验阳极,在测试其基本物理化学性能的基础上,采用“改进断电流法”进行阳极过电位测试,研究AlF3添加剂和阳极焙烧温度对阳极过电位的影响。结果表明:在一定条件下,阳极中添加AlF3既可降低阳极的空气/CO2反应活性,也可降低阳极过电位;受高温脱S等因素的影响,阳极的电化学活性及其空气/CO2反应活性并未随着焙烧温度的提高相应降低。 相似文献
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针对目前国内外铝电解槽焙烧启动方法的特点,本文选用燃料燃烧产生的高温烟气来焙烧启动预焙阳极铝电解槽,为确保高温烟气对铝电解槽的焙烧效果,采用了基于PLC与增量式PID算法的自动控制系统。在75kA系列预焙槽上进行了工业试验,结果表明采用自动控制系统的烟气焙烧技术具有易于实现电解槽焙烧操作的自动化.可以做到使阴极温度缓慢均匀且可控地上升,断面温度梯度较小、阴极表面温度均匀。 相似文献
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Salah Amrani Duygu Kocaefe Yasar Kocaefe Dipankar Bhattacharyay Mohamed Bouazara Brigitte Morais 《Journal of Materials Engineering and Performance》2016,25(10):4274-4282
The objective of this work is to understand the different mechanisms of crack formation in dense anodes used in the aluminum industry. The first approach used is based on the qualitative characterization of the surface cracks and the depth of these cracks. The second approach, which constitutes a quantitative characterization, is carried out by determining the distribution of the crack width along its length as well as the percentage of the surface containing cracks. A qualitative analysis of crack formation was also carried out using 3D tomography. It was observed that mixing and forming conditions have a significant effect on crack formation in green anodes. The devolatilization of pitch during baking causes the formation and propagation of cracks in baked anodes in which large particles control the direction of crack propagation. 相似文献
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P. Prigent M. L. Bouchetou J. Poirier P. Hubert 《JOM Journal of the Minerals, Metals and Materials Society》2008,60(5):58-63
In the past, the mechanisms of corrosion in refractory materials used in the flue wall of anode baking furnaces have been
poorly understood. To better understand the processes of degradation, a study of corroded refractories from anode baking furnaces
was conducted. This study found that all refractory bricks contain fine andalusite particles in the matrix and fireclay as
aggregates. The first stage of corrosion is the penetration of gaseous sodium, coming from recycled anodes, through the porosity
of materials. Then, at high temperature, sodium becomes oxidized and is included in the liquid phase. The sodium-rich liquid
phase corrodes the refractory material, in particular mullite networks. To understand why the andalusite mineral is used in
the refractory materials, a corrosion test able to simulate the gaseous corrosion of materials at laboratory scale was developed.
Several recipes, composed of andalusite or fireclay, were submitted to the corrosion test. The microstructural observations
showed that the matrix is more sensitive to corrosion. Thus, the use of a raw material such as andalusite in the matrix is
advised in order to reduce the gaseous sodium corrosion of fireclay based bricks. 相似文献