废橡胶共焦化对焦炭结构影响

Study on influence of coking with used rubber on coke microstructure

为了研究废橡胶配煤炼焦对焦炭质量的影响,本文对橡胶粉的热解性能进行分析,并利用70kg试验焦炉进行配煤炼焦试验,试验结果表明,通过对废橡胶的热解特性分析废橡胶的热解区间与配合煤相近,废橡胶的红外光谱与气煤相近,为废橡胶代替气煤配煤炼焦提供了可能。小焦炉试验表明,随着废橡胶的配煤配比增加,焦炭灰分下降,硫分有所上升,焦炭机械强度DI略有降低,焦炭反应后强度降低;在配比2%的范围内,灰分略有下降,硫分有所上升,DI略降低,CSR略提高,焦炭质量基本保持稳定。废橡胶配煤得到的焦炭微观结构分析表明,0.1~10μm的中孔和大于10μm大孔的比表面积变化不明显,而小于0.1μm的微孔比表面积变化最大。废橡胶配比从0到6%,则焦炭微孔比表面积从1.5m2/g增加到3.5m2/g。由于焦炭的二氧化碳反应性发生在表面,因此比表面积大则反应速度快,焦炭反应后强度降低。焦炭微晶结构分析表明,随着废橡胶配比的增加,堆积高度Lc逐渐降低,石墨化度逐渐降低,废橡胶的加入影响到焦炭的基质结构,石墨化度降低对于焦炭的机械强度不利。

In order to study the influence of used rubber on coke quality, the pyrolysis performance of rubber powder is analyzed, the 70kg test coke oven is used to coking. The results show that the pyrolysis characteristics of used rubber is similar to eoal, that provide the possibility of waste rubber instead of coal in coking. The results also show that with used rubber blending ratio increase, coke ash content decreased, sulfur content increased, coke mechanical strength of DI decreased slightly and the CSR decreased. In the range of ratio of 2%, ash decreased slightly, sulfur content increased, DI decreased, CSR increased slightly, the eoke quality remained stable. The analysis shows that the specific surface area of micro-pore （（ 0. 1μm） have the biggest change, while the middle pore （0.1--10him） and the big pore （10μm） does not change significantly. When the ratio of used rubber was from 0 to 6%, the specific surface area of eoke increased from 1.5m2/g to 3.5m2/g, that is the reason the bigger specific surface react fast and the strength of coke after reaction decreases. The analysis also shows thatthe stacking height of Lc decreased gradually with the increase of the ratio of used rubber. Coke mechanical strength is decrease with the degree of graphitization of coke.