生物质烧结燃料反应性优化研究

Research on Reactive Optimization of Biomass Fuel Based on Sintering

由于生物质燃料放热反应太快,直接应用在烧结中导致火焰前峰与热波前峰不匹配影响烧结矿性能.因此,利用CaO粉末对生物质燃料孔隙进行填充和生物质燃料"包裹制粒"对生物质燃料改性,并利用差热实验和热重实验对改性后燃料和焦煤进行对比检测实验.结果表明:生物质燃料经CaO粉末改性后,生物质燃料放热开始反应温度Te提升至382.09℃,放热拐点温度Ti提高至395.23℃,差热曲线(DTA)后移延缓热量释放;改性生物质燃料经包裹制粒后,开始失重温度提高至462℃,放热时间明显延长,与焦粉失重曲线接近.

The exothermic reaction of biomass fuel is too fast,causing a heat mismatch between flame front and wave front,which can greatly affect the performance of the ore sintering. In this work,the Ca O powder will be filled in the pore of biomass fuel and the ＂package granulation＂will be used to make a modification of biomass fuel in order to optimize the reaction. The differential thermal and thermo gravimetric results of modified fuel are compared with those of coke breeze. The experimental results showthat the exothermic reaction temperature of the biomass fuel modified by Ca O powder increases to 382. 09 ℃ and the exothermic inflection point temperature increases to 395. 23 ℃,and the differential thermal curve moves back and delays thermal release. As to the biomass fuel modified by the ＂package granulation＂in the sintering mixture,the weightlessness temperature increases to 462 ℃,the weight loss time is prolonged,and the weight loss curve closes to that of coke powder.