水热耦合热解方法制备炼铁用高品质生物质炭  

Preparation of high-quality biochar for ironmaking by hydrothermal coupled pyrolytic method

作　　者：王广伟[1] 阚光泽 宁晓钧[1] 王川 WANG Guangwei;KAN Guangze;NING Xiaojun;WANG Chuan(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Swerim AB,LuleåSE-97125,Sweden)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]瑞典国家冶金研究院,瑞典吕勒奥SE-97125

出　　处：《中国冶金》2025年第2期86-93,共8页China Metallurgy

基　　金：中国宝武低碳冶金创新基金资助项目(BWLCF202215,BWLCF202305);国家自然科学基金面上项目(52174295)。

摘　　要：以废木料为原料,采用水热耦合热解方法制备炼铁用高品质生物质炭,研究了水热耦合热解工艺参数对制备生物质炭物化属性的影响。结果表明,水热炭化能够高效脱除生物质原料中水溶性矿物元素,废木料水热炭中碱金属质量分数为0.0329%,达到特低碱度煤的水平。水热过程对挥发分的脱除效果稍差,废木料水热炭挥发分质量分数为64.83%,远高于高炉用烟煤和无烟煤的水平,需要结合热解炭化进一步提升品质。废木料水热炭热解过程挥发分得到了有效脱除,废木料热解炭(H-PC)挥发分质量分数为4.18%~29.74%,固定碳含量和热值也得到明显提升,600℃下热解30 min的H-PC热值、质量收得率和能量收得率相对最佳,分别达到了33.63 MJ/kg、45.18%、61.67%。热解温度对H-PC的物化属性的影响远大于热解时间,随热解温度和时间升高,H-PC比表面积先增加而后减小,碳微晶结构逐渐致密,有机官能团的种类和数量逐渐减少,H-PC样品的芳香化程度逐渐加深。以上系统研究表明,采用水热耦合热解方法制备的生物质炭能够满足高炉炼铁对固体燃料的性能要求,热解温度为600℃、热解时间为30 min时制备的样品性能与无烟煤接近,可以作为低碳燃料应用于高炉炼铁生产。发展水热耦合热解炭化技术是实现生物质资源在高炉炼铁工序中高效利用的关键,该研究可为制备高炉低碳燃料的研究提供参考。A hydrothermal coupled pyrolytic method was used to prepare high-quality biochar for ironmaking from waste wood as raw material,and the effects of hydrothermal coupled pyrolytic process parameters on the physical and chemical properties of the prepared biochar were investigated.The results show that hydrothermal carbonization can efficiently remove water-soluble mineral elements from the biomass raw materials,and the alkali metal mass fraction in the hydrochar of waste wood is 0.0329%,which reaches the level of coal with extra-low alkalinity.The effect of hydrothermal process on the removal of volatile matter is a little bit poorer,and the mass fraction of volatile matter in waste wood hydrochar is 64.83%,which is much higher than the level of bituminous coal and anthracite coal used in blast furnace(BF),and it needs to be combined with pyrolytic carbonization to further improve the quality.The volatile matter of waste wood hydrochar pyrolytic process is effectively removed,the volatile matter mass fraction of waste wood pyrolysis char(H-PC)ranges from 4.18%to 29.74%,and the fix carbon content and calorific value are also significantly improved,and the calorific value,mass yield and energy yield of H-PC pyrolytic for 30 min at 600℃are relatively optimal,reaching 33.63 MJ/kg,45.18%and 61.67%,respectively.The effect of pyrolytic temperature on the physical and chemical properties of H-PC are much greater than that of pyrolytic time.With the increase of pyrolytic temperature and time,the specific surface area of H-PC firstly increases and then decreases,the carbon microcrystalline structure gradually densifies,the type and number of organic functional groups gradually reduce,and the degree of aromatization of H-PC samples gradually deepens.The above systematic study shows that the biochar prepared by hydrothermal coupled pyrolytic method can meet the performance requirements of solid fuel for BF ironmaking,and the samples prepared with pyrolytic temperature of 600℃and pyrolytic time of 30 min have the performanc

关 键 词：低碳炼铁 生物质 炭化 热解 水热 微观结构 

分 类 号：TQ127.11[化学工程—无机化工]