捣固炼焦配合煤工艺参数对焦炭冷强度的影响研究

Study on the influence of process parameters of stamping coking blended coal on the mechanical strength of coke

通过探究捣固炼焦配合煤的工艺参数与焦炭冷强度的关系以优化捣固炼焦工艺条件,在保证焦炭热强度稳定的同时可确定提高焦炭冶金焦率的最佳工艺参数并为改善配煤工艺条件提供指导。结合现场实验用配合煤的煤质特性参数及其配比,设计炼焦试验条件与方法的研究方案,重点针对配合煤的水分、细度、堆密度工艺参数对块焦率、块焦强度、显微强度等焦炭冷强度的影响进行相应研究。由研究可知:建龙西钢配合煤随水分的增大则块焦强度和显微强度基本不变,而焦炭的块焦率先升高后下降,当水分在13%时其块焦率达到最大;随着细度的增高则块焦强度和显微强度呈现先增高后下降的趋势,而焦炭的块焦率呈下降趋势,细度大于90%时的块焦率下降明显。随着配合煤堆密度的增加,其块焦强度和显微强度增大,焦炭的块焦率增大明显。为提高焦炭冷强度,在配合煤配比不变并综合考虑焦炭冷强度指标变化趋势的前提下,配合煤的水分、细度、堆密度应分别控制在约13%、90%、1.0 t/m^(3)为宜。

By exploring the relationship between the process parameters of Jianlong Xilin Steel stamping coking blended coal and the mechanical strength of coke,the stamping coking process conditions can be optimized.While ensuring the stable thermal strength of coke,the optimal process parameters for improving the metallurgical coke yield can be determined and guidance can be provided for improving the coal blending process conditions.Based on the research scheme design of the coal quality characteristic parameters and their proportions of the blended coal used in the experiment,as well as the coking test conditions and methods,the influence of the process parameters such as blended coal moisture,fineness,and bulk density on the coke mechanical strength(lump coke rate,lump coke strength,and microstrength)was studied.According to research,it can be concluded that with the increase of moisture content,the block coke strength and microstrength of Jianlong Xilin Steel’s blended coal remain basically unchanged,while the block coke first increases and then decreases.When the moisture content is 13%,its block coke ratio reaches its maximum;as the fineness increases,the block coke strength and microstrength first increase and then decrease,while the coke block coke ratio shows a decreasing trend.When the fineness is greater than 90%,the block coke ratio decreases significantly.As the bulk density of the blended coal increases,the block coke strength and microstrength increase,and the block coke ratio increases significantly.In order to improve coke mechanical strength,on the premise of maintaining the same proportion of blended coal and considering the trend of changes in coke mechanical strength indicators,it is more suitable to control the moisture content of blended coal at about 13%,fineness at about 90%,and coal bulk density at about 1.0 t/m^(3).