不同烘焙预处理条件对竹屑颗粒可磨性的影响  

Effects of different torrefaction pretreatment conditions on the grindability of bamboo pellets

作　　者：陈剑峰 成伟 张俊杰 蒋好 李赓 田旭 邵敬爱[1,2] 陈汉平[1,2] CHEN Jianfeng;CHENG Wei;ZHANG Junjie;JIANG Hao;LI Geng;TIAN Xu;SHAO Jing'ai;CHEN Hanping(State Key Laboratory of Coal Combustion and Low Carbon Utilization,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院煤燃烧与低碳利用全国重点实验室,武汉430074 [2]华中科技大学能源与动力工程学院,武汉430074

出　　处：《农业工程学报》2025年第6期237-246,共10页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划项目(2022YFB4202000)。

摘　　要：生物质本身可磨性差,原料磨细制粉困难,而烘焙是清洁高效的预处理方法之一。该研究以竹屑颗粒作为原料,探究了不同烘焙温度与氧气浓度对生物质基本理化性质、可磨性与粒度分布的影响。结果表明:随着焙烧温度和氧浓度的提高,样品的热值提升明显,且烘焙后样品的H/C比和O/C比下降明显;在傅里叶红外光谱分析中,烘焙生物质的主要官能团的典型峰峰值随着烘焙程度的加深而下降;烘焙程度的加深也有助于样品可磨性的提升,烘焙后样品的哈氏可磨指数明显提升;烘焙预处理同样能改善研磨后样品的粒度分布,但会使样品的均匀性降低;采用响应面分析进一步优化试验,得到竹屑颗粒最佳烘焙条件为:270℃左右的烘焙温度、10%左右的氧气浓度。该研究结果将为竹屑颗粒的进一步高质化利用提供理论参考。Biomass energy is one of the most important parts in of the new energy system.Combustion power generation can be expected to utilize the biomass energy under the carbon peaking and neutrality.Among them,the grindability is one of the most significant indexes to evaluate the feasibility of biomass utilization.While the biomass itself can share the low grindability difficult to grind fine,indicating the low pretreatment of the biomass.Therefore,it is very critical to improve the grindability of biomass for the effective utilization of biomass.Fortunately,the torrefaction can be expected to serve as the clean and efficient pretreatment for the high grindability.The moisture and oxygen content of biomass can also be reduced to improve the combustion,pelletizing,and transportation performance of biomass.The fibrous structure can be decomposed after biomass torrefaction.While the woody biomass is utilized mainly for the torrefaction in Europe.It is still lacking on in the bamboo biomass.Since the bamboo biomass is widely distributed and abundant in China,the torrefaction of bamboo biomass can play an important role in the development of biomass energy.In this study,the bamboo pellets were selected as the raw materials.A series of proximate analysisanalyses,ultimate analysis,laser particle size analysis,and detection were carried out to explore the effects of torrefaction temperatures and oxygen concentrations on the biomass's basic physicochemical properties,grindability,and particle size distribution.Results showed that the torrefaction was greatly contributed to the combustion performance of bamboo pellets.The mass fraction of C increased continuously with the increasing of torrefaction degree,whereas,the mass fraction of O decreased significantly.Specifically,the fixed carbon increased from 12.67%to the highest 50.47%.The calorific value also increased from 21.32 MJ/kg to the highest 29.49 MJ/kg.The samples were closer to anthracite in the Van Krevelen diagram,indicating the outstandingly improved properties of bamb

关 键 词：烘焙 生物质 可磨性 粒度分析 响应面分析 

分 类 号：S216.2[农业科学—农业机械化工程] TK6[农业科学—农业工程]