不同反应性焦炭溶损劣化行为

为了研究不同反应性焦炭的溶损劣化行为与孔隙结构变化的关系,以不同温度下溶损反应前后焦炭气孔结构变化为主要研究对象,采用自主研发的焦炭综合热性质检测装置,对6种焦炭进行国标实验以及1 050、1 100、1 150、1 200、1 250和1 300℃恒温等溶损率为25%的溶损实验,通过I型转鼓检测焦炭溶损后强度,采用低温N2吸附法检测溶损反应前后气孔结构。结果表明:国标法评价焦炭的热性质值得商榷,应采用等溶损率为25%,且通过调整溶损温度来改变溶损速率的方法,模拟焦炭在高炉内实际溶损过程。通过焦炭溶损-转鼓后比表面积变化得到焦炭在不同温度下溶损反应模型存在差异,相同溶损温度下高反应性焦炭溶损区域较大,低反应性焦炭溶损反应区域较小。

Study on degradation behavior of different reactivity coke

In order to study the relationship between the coke dissolution behavior and the coke structure deteri-oration,the pore structures of the coke unreacted and after solution loss reaction are studied according to Inter-national standard at the coke dissolution rate of 25% and the coke dissolution temperature at 1 050,1 100,1 150,1 200,1 250 and 1 300℃,by using the homemade coke comprehensive thermal properties detector to detect the intensity of the I type drum in the low temperature N2adsorption atmosphere.The results show that:it is debatable to evaluate the thermal properties of coke according to the international standard.The actual loss process of coke in blast furnace is simulated by using the dissolution loss of 25% and adjusting the temperature of dissolution.Comparison of the changes of the specific surface areas of coke after the loss and rotation,the difference models of the loss reaction of coke at different dissolution temperatures are obtained.There is a larg-er loss area of high reactive coke at the same dissolution temperature,and a smaller reaction area of low reac-tive coke.