生物质冷压成型模具摩擦热分析  

Analysis of friction heat formed in biomass cold briquetting mold

作　　者：杜红光[1] 董玉平[1] 王慧[1] 郭飞强[1] 

机构地区：[1]山东大学机械工程学院高效洁净机械制造教育部重点实验室,济南250061

出　　处：《农业工程学报》2011年第9期58-62,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：山东省自然科学基金(ZR2009EZ001)

摘　　要：为了揭示生物质成型过程中摩擦热引起的温度变化规律以指导生物质成型机的设计,根据生物质冷压成型特点和传热学原理,引入平均压力和当量速度等,建立生物质成型模具的摩擦热分析模型,对成型过程摩擦热进行数值模拟试验。结果表明,试验结果和模拟结果基本吻合,冷压成型摩擦热引起的温度变化为:成型模具内表面温度在工作运转60 min后达到木质素软化温度,成型制品质量有所提高,240 min后温度趋于稳定,最终温度在115～125℃;通过控制原料、模具材料、模具结构、生产率等因素,可缩短成型达到木质素软化点所需时间,提高成型质量。In order to reveal the regularity that friction heat formed in biomass cold briquetting can cause temperature change and use this regularity to design biomass molding machine, physical parameters such as average stress and equivalent velocity were defined to establish friction heat analytical model of biomass mould according to the characteristics of biomass cold and heat transfer theory. Numerical simulation experiment on heat friction formed in biomass cold briquetting was conducted. Compared with experiment results, the theoretical model results were reasonable. The temperature change regularity caused by friction heat in biomass cold briquetting was concluded, it was that after running 60 min the internal surface temperature of mold reached softening temperature of lignocellulose, at that temperature the quality of mold was improved. Also after running 240 min temperature of that tended towards stability and final temperature of that was from 115 to 125℃. By adjusting the kinds of raw material , mold material , mold structure, production rate and so on, the operating time to softening temperature of lignocellulose can be reduced and the quality of mold can be improved.

关 键 词：生物质 模具 压缩成型 摩擦热 温度场 

分 类 号：TK6[动力工程及工程热物理—生物能] TH122[机械工程—机械设计及理论]