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捣固焦由于成本低且性能指标较好而逐步推广使用,然而首秦高炉在使用捣固焦后出现了炉内压量关系紧张、炉况不顺等问题。为了了解这批焦炭的实际性能,进行了反应性试验、差热试验以及光学组织含量分析,结果表明:焦炭光学组织中镶嵌结构有抑制裂纹发展和缓解热膨胀的作用,而捣固焦的镶嵌组织含量较低,因此在高温和冲击受力的作用下更容易产生裂纹;分析6种焦粉失重曲线可以发现,同性组分ΣISO含量高的捣固焦粉从1 000升高到1 300℃过程中汽化反应失重率增加更快,在炉内可能引起的粒度降解更严重,从而造成炉况不顺。
Tamping coke due to low cost and better performance and gradually promote the use of, but after the use of stamping coke Shijiazhuang furnace pressure appeared tension, furnace conditions and other issues. In order to understand the actual performance of these coke, reactivity test, differential thermal test and optical microstructure analysis were carried out. The results show that inlay structure in coke optical structure can inhibit crack growth and relieve thermal expansion, while tamping coke mosaic structure Content is low, so the cracks are more likely to occur under the action of high temperature and impact stress. Analyzing the weight loss curves of six kinds of coke powder, it can be found that the high-ΣISO content of the same-sex component increases from 1000 to 1300 ℃ In the vaporization reaction, the rate of weight loss increases more rapidly, which may lead to more serious particle size degradation in the furnace, resulting in unfavorable furnace conditions.