生物质原料具有碳中性的属性,将其用于高炉冶炼可以降低钢铁生产 CO2 排放.以典型农林废弃物为原料制备生物质炭,研究了热解炭化和水热炭化工艺参数对制备生物质炭高炉喷吹性能的影响.结果表明,2 种炭化方式均可有效脱除生物质原料中的挥发分,提升生物质炭的品质,但热解炭化会造成灰分富集,水热炭化能够同时脱除灰分,生物质热解炭的收得率低于水热炭.生物质热解炭和水热炭的着火点较低,其中水热炭具有强爆炸性,热解炭无爆炸性,生物质热解炭和水热炭的燃烧性能和可磨性优于高炉喷吹烟煤.有害元素分析表明,水热炭的碱金属含量远低于热解炭,对于林木类生物质,2 种炭化方式制得的生物质炭均可应用于高炉喷吹生产,但需控制热解炭的喷吹量;对于秸秆类生物质,应优选水热炭化的方式进行炭化提质,以降低碱金属对高炉冶炼的负面影响.
Study on preparation of blast furnace injection fuel by biomass carbonization and upgrading
Biomass feedstock,known for its carbon-neutral properties,can significantly reduce CO2 emissions in steel production when used in blast furnace(BF)smelting.The effect of pyrolytic and hydrothermal carbonization parameters on the BF injection performance of biochar was studied.Both carbonization methods effectively eliminate volatiles from biomass,enhancing biochar quality.However,pyrolysis carbonization causes ash enrichment,while hydrothermal carbonization can remove ash simultaneously,resulting in lower yields of pyrolysis carbonization compared to hydrothermal carbonization.The ignition point of biomass pyrolysis carbon and hydrothermal carbon is relatively low,among which hydrothermal carbon has strong explosiveness and pyrolysis carbon has no explosiveness.The combustion performance and grindability of biomass pyrolysis carbon and hydrothermal carbon are better than those of blast furnace injection bituminous coal.The analysis of harmful elements shows that the alkali metal content of hydrothermal carbon is much lower than that of pyrolysis carbon.For forest biomass residues,both carbonization methods can be used for blast furnace injection production,but the injection amount of pyrolysis carbon needs to be controlled;for straw biomass residues,hydrothermal carbonization is preferred to reduce the negative impact of alkali metals on blast furnace smelting.
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