打印机废碳粉与煤粉混合燃烧性能及动力学分析

Combustion performance and kinetic analysis of printer waste toner mixed with pulverized coal

随着国家“双碳”目标的持续推进,发展钢铁工业新兴技术的同时,燃料多元化、资源高效化也是实现节能减排的必由之路。为挖掘打印机废碳粉在钢铁行业中的潜在应用,探究其运用于高炉喷吹工艺的可行性,通过热重分析废碳粉和高炉喷吹煤粉及其不同比例的混合燃料研究了其燃烧行为、燃烧性能、协同效应参数及动力学参数,探明燃料燃烧机制,为高炉喷吹新型燃料提供理论基础。结果表明:废碳粉有较好的燃烧性能,其综合燃烧特性指数、燃烧稳定性、可燃性指数均优于煤粉,可以作为高炉喷吹辅助燃料替代部分煤粉。当废碳粉掺混比例为10%时,混合燃料燃烧性能最佳,综合燃烧性能指数、燃烧稳定性、可燃性指数分别为21.97×10^(-10)(min^(-2)·K^(-3))、23.33×10^(-6)(min^(-1)·K^(-2))、25.16×10^(-6)(min^(-1)·K^(-2));通过废碳粉灰分成分分析,发现废碳粉灰分中Fe_(3)O_(4)质量分数高达84.99%;通过废碳粉与煤粉的协同效应分析,发现废碳粉与煤粉共混可以促进燃烧,且协同效应参数F都在0.80≤F≤1.15的范围内;通过动力学分析发现混合燃料燃烧所需活化能比单一燃料低,并随废碳粉比例增加总体呈下降趋势。

With the continuous promotion of the national“dual carbon”target,while developing emerging technologies in iron and steel industry,fuel diversification and resource efficiency are also the only way to achieve energy conservation and emission reduction.To explore the potential application of printer waste toner in the iron and steel industry,to explore the feasibility of the blast furnace injection process,the combustion behavior,performance,synergistic effects,and dynamic parameters of waste toner,pulverized coal used in blast furnace injection,and their mixed fuel in different proportions were investigated by thermogravimetric analysis to understand the fuel combustion mechanism and provide a theoretical basis for the injection of new fuels into blast furnaces.The results show that waste toner has excellent combustion performance,and its comprehensive combustion characteristic index,combustion stability,and flammability index are all better than those of pulverized coal.This suggests that waste toner can serve as an auxiliary fuel for blast furnace injection,potentially replacing a portion of pulverized coal.When the blending ratio of waste toner is 10%,the combustion performance of the mixed fuel is optimal,with a comprehensive combustion performance index,combustion stability,and flammability index of 21.97×10^(-10)(min^(-2)·K^(-3)),23.33×10^(-6)(min^(-1)·K^(-2))and 25.16×10^(-6)(min^(-1)·K^(-2)),respectively.Through analysis of the ash content of waste toner,it was found that the mass fraction of Fe3O4 in the ash content of waste toner was as high as 84.99 mass%.Through the analysis of the synergistic effect between waste toner and pulverized coal,it was found that the blending of waste toner and pulverized coal can promote combustion,and the synergistic effect parameter F is in the range of 0.80-1.15.Through dynamic analysis,it was found that the activation energy required for combustion of mixed fuels is lower than that of single fuels,and it generally decreases with the increase of the proportion of waste toner.