文献类型：期刊文献

中文题名：玉米秸秆烘焙过程中碱金属的赋存迁移及烘焙炭与煤共成浆性研究

英文题名：Study of alkali metal migration during corn straw baking and the co-pulpability of torrefied charcoal and coal

作者：茅力龚[1];王春雨[2];王家玺[1];丁路[1];于广锁[1]

机构：[1]华东理工大学洁净煤技术研究所,上海200237;[2]盐城工学院机械工程学院,江苏盐城224001

年份：2025

卷号：50

期号：12

起止页码：5390

中文期刊名：煤炭学报

外文期刊名：Journal of China Coal Society

收录：;EI(收录号：20255219810888);北大核心:【北大核心2023】；

基金：国家重点研发计划资助项目(2023YFB4203803)。

语种：中文

中文关键词：玉米秸秆;烘焙;水热;共成浆性;碱金属

外文关键词：corn straw;torrefaction;hydrothermal;co-pulpability;alkali metal

摘要：生物质资源丰富,具有碳中性,是化石能源的可持续替代品。开发利用生物质资源,是能源生产和消费革命的重要内容。低温炭化是一种有效的生物质预处理方式,可实现生物质的高效利用。选取玉米秸秆为原料,在180~240℃的温度范围对其进行湿法水热和干法烘焙处理,并通过微波消解技术与化学分馏法分析原料及烘焙炭中碱金属的迁移规律。研究结果显示,随着烘焙温度的逐渐升高,碱金属钾的总含量逐渐减少,并且发生了钾的赋存形式从水溶态向离子交换态的转变。将烘焙炭与煤混合制备炭-煤-水多元浆体,探讨了烘焙工艺对生物质颗粒的成浆性能的影响,并进一步分析了碱金属的赋存迁移与多元浆体成浆性能之间的相关性。结果表明,相较于湿法水热处理,通过干法烘焙技术制得的烘焙炭,在与煤制备炭-煤-水多元浆体时,具有更好的流动性能以及较低的表观黏度,在质量分数为56%、烘焙炭的掺混量为10%的条件下,浆体的最低表观黏度为469.31 mPa·s。这是由于水溶态钾与颗粒表面的羧基官能团反应生成了羧酸钾盐,减少了亲水基团的数量,相对增强了颗粒的疏水性,进而提高了浆体的流动性能并降低了黏度。
Biomass resources are abundant,carbon neutral and a sustainable alternative to fossil fuels.The development and use of biomass resources is an important part of the revolution in energy production and consumption.Low-temperature carbonization is an effective biomass pre-treatment,which can achieve efficient biomass utilization.Corn straw was selected as the experimental raw material,and initially pretreated by hydrothermal carbonization and dry torrefaction in the temperature range of 180?240℃.Subsequently,a comprehensive analysis of alkali metal migration in the raw material and torrefied charcoal was conducted through the use of microwave digestion and chemical fractionation.The findings indicated that the total potassium content decreases with increasing torrefaction temperature,accompanied by a shift in the potassium's form from water-soluble to ion-exchangeable.The effect of the baking process on the pulping performance of biomass particles was examined following the mixing of torrefied charcoal with coal for pulping,and the correlation between alkali metal migration and pulping performance was further analysed.The results showed that the multifunction-al slurry,prepared from torrefied charcoal and coal by dry torrefaction,exhibits superior flowability and lower apparent viscosity compared to hydrothermal carbonization.The lowest apparent viscosity of the slurry was observed at 469.31 mPa·s,at a concentration of 56%and a torrefied charcoal blend of 10%.This was due to the reaction of potassi-um in the water-soluble state with the carboxyl functional groups on the surface of the particles,resulting in the formation of potassium carboxylate salts.This phenomenon resulted in a reduction in the number of hydrophilic groups and a relat-ive increase in the hydrophobicity of the particles,which in turn enhanced the fluidity of the slurry and reduced the viscosity.