入炉碱负荷与焦炭劣化的关系

Relationship between alkali load and degradation of coke

为了研究首钢高炉入炉碱负荷与炉内焦炭劣化的关系,利用碱金属循环富集模型计算碱金属在高炉内的最大富集量及在高炉内部不同部位的分布,然后进行焦炭在不同浓度碱蒸气下的熔损试验,通过反推计算最终得到了在不同入炉碱负荷情况下焦炭劣化的程度。结果表面,钾和钠在首钢高炉内最大的富集量分别为34.89和7.44kg/t,炉内焦炭已经发生严重劣化,反应性CRI为53.14%,反应后强度CSR为61.69%。要想控制住碱金属对首钢高炉的危害,入炉K_2O和Na_2O质量必须分别限制在0.48和3.11kg/t以内。

In order to research the relationship between alkali load and degradation of coke in Shougang blast furnace,a mathematic model of the circulatory accumulation of alkalis was used to calculate the final accumulation and distribution of alkalis in blast furnace.Then a series of experiments on coke solution had been taken in different concentration alkalis atmosphere.By means of inverse calculation,the degradation degree of coke under different alkali load conditions could be achieved.The result indicated that,the final accumulation of potassium and sodium in Shougang blast furnace were 34.89 and 7.44kg/t.However,the coke in blast furnace had been degraded badly,CRI and CSR of which were 53.14% and 61.69%.If the damage of alkalis were expected to be controlled,the potassium load and sodium load would be restricted below 0.48 and 3.11kg/t.