提高厚料层烧结燃料燃烧性的试验研究

来源期刊：钢铁2010年第11期

论文作者：吴胜利 陈东峰 赵成显 韩宏亮 薛方 张丽华

文章页码：16 - 21

关键词：厚料层烧结； 燃料粒度； 燃料分加方式

Key words：deep bed sintering； fuel size； separate addition of fuel

摘    要：厚料层烧结是烧结技术发展的重要方向,但料层增厚引起一系列烧结行为的变化,如自动蓄热加强,导致料层高温区变厚,气体体积膨胀量增加,透气性恶化,氧气的质量含量降低,燃料燃烧速度减慢,高温区宽度进一步增加,还使得残碳和无益燃烧增加,下部烧结矿过熔,影响烧结矿的产、质量,进而降低厚料层的节能效果。为了解决这些问题,采用粒度为1.00~3.15 mm的高燃烧性燃料,选择燃料的配加方式为"燃料分加"或"燃料、熔剂共同分加"等方案提高厚料层烧结固体燃料的燃烧性,并对各试验方案下的透气性和烧结指标进行研究,结果表明上述3个措施均有利于厚料层烧结的实施。

Abstract: The deep bed sintering is an important direction of sintering technology.As the depth of sinter bed increasing,there will be a series of changes in sintering behaviors,for example,the self accumulation heat of the sinter bed is strengthened,the high-temperature region is widened,the gas volume expansion is increased,permeability is distinctly deteriorated,the mass content of O₂ is decreased,the combustion speed of coke breeze is lowered,the high-temperature region is widened furtherly,at the same time,the residual carbon and unprofitable combustion is increased,and the lower sinter of sinter bed is ultra-fused,which cause the sinter yield index and quality index decline.To solve problems of deep bed sintering,new methods were proposed to improve the combustion of coke breeze.Available technical measures including controlling coke breeze size distribution in 1.00-3.15 mm,adopting "separate addition of fuel" or "separate addition of solid fuel and flux" as the method of improving solid fuel combustion,and studying the permeability and the sinter technical index of each scheme,the conclusion is that improvement in the combustibility of solid fuels can be helpful to deep bed sintering.