速生林桉木屑与天然林木屑的成型特性比较
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摘要
[目的]比较速生林桉木屑与天然林木屑的成型特性。[方法]对比速生林桉木屑与现有应用成熟的天然林硬杂木屑的成型差异,在WD-100KE型电子压力机上进行桉木屑与硬杂木屑的单颗粒压缩成型试验,研究成型参数水分8%～16%、温度80～160℃、压力4 000～8 000 N、粒径1～5 mm对成型指标松弛密度、比能耗、Meyer强度的影响。[结果]水分12%～14%、温度100～120℃、压力5 000～6 000 N、粒径2～3 mm为桉木屑及硬杂木屑较佳的成型参数范围;相同成型条件下,桉木屑与硬杂木屑相比松弛密度相差不大,但比能耗明显较高、颗粒Meyer强度明显较低。[结论]为了降低桉木屑成型能耗、提高颗粒强度及提高现有生产设备的原料适应性,可采用与现有硬杂木屑混配成型的方式,以提高成型效果。
[Objective]To compare the compression characteristics of eucalyptus sawdust and natural sawdust in fast-growing forest.[Method]Comparing with the compression properties between fast-growing forest eucalyptus sawdust and natural forest hardwood sawdust,the single pellet compression experiments were conducted on the WD-100 KE type electronic pressure machine. The effects of compression parameters of moisture 8%-16%,temperature 80-160 ℃,pressure 4 000-8 000 N,and particle size 1-5 mm on relaxed density,specific energy consumption,Meyer hardness were investigated in detail. [Result]The suitable pellet production condition for eucalyptus sawdust was 12%-14%moisture,100-120 ℃ temperature,5 000-6 000 N pressure,and 2-3 mm particle size. Compared eucalyptus sawdust with hardwood sawdust,the relaxed density was similar,the specific energy consumption was significantly higher,and the Meyer hardness was significantly lower.[Conclusion]Eucalyptus sawdust blended with hardwood sawdust could be adopted in order to reduce the energy consumption,improve pellets Meyer hardness and the adaptability of existing production equipment.
[Objective]To compare the compression characteristics of eucalyptus sawdust and natural sawdust in fast-growing forest.[Method]Comparing with the compression properties between fast-growing forest eucalyptus sawdust and natural forest hardwood sawdust,the single pellet compression experiments were conducted on the WD-100 KE type electronic pressure machine. The effects of compression parameters of moisture 8%-16%,temperature 80-160 ℃,pressure 4 000-8 000 N,and particle size 1-5 mm on relaxed density,specific energy consumption,Meyer hardness were investigated in detail. [Result]The suitable pellet production condition for eucalyptus sawdust was 12%-14%moisture,100-120 ℃ temperature,5 000-6 000 N pressure,and 2-3 mm particle size. Compared eucalyptus sawdust with hardwood sawdust,the relaxed density was similar,the specific energy consumption was significantly higher,and the Meyer hardness was significantly lower.[Conclusion]Eucalyptus sawdust blended with hardwood sawdust could be adopted in order to reduce the energy consumption,improve pellets Meyer hardness and the adaptability of existing production equipment.
引文
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[2]杨华,刘石彩,赵佳平,等.生物质棒状成型燃料的物理特性研究[J].中南林业科技大学学报,2015,35(2):114-118.
[3]罗志华,苏超杰.木屑生物质致密成型燃料的差热分析[J].黑龙江科技信息,2013(22):273-274.
[4]许洁,袁振宏,姜洋,等.基于学习曲线的生物质成型燃料补贴政策研究[J].林产化学与工业,2016,36(2):134-138.
[5]谢耀坚.中国桉树育种研究进展及宏观策略[J].世界林业研究,2011,24(4):50-54.
[6]温玉丛.广东博罗桉树商品林的现状分析与可持续发展对策[J].中国林业产业,2016(4):204.
[7]任忠秀,包雪梅,于家伊,等.我国桉树人工林施肥现状、存在问题及对策[J].桉树科技,2013,30(4):52-59.
[8]陈少雄,陈小菲.我国桉树经营的技术问题与思考[J].桉树科技,2013,30(3):52-59.
[9]SLUITER A,HAMES B,RUIZ R,et al.Determination of structural carbohydrates and lignin in biomass[M]//Laboratory Analytical Procedure(LAP).Golden,CO:National Renewable Energy Laboratory,2011.
[10]TUMULURU J S,TABIL L,OPOKU A,et al.Effect of process variables on the quality characteristics of pelleted wheat distiller’s dried grains with solubles[J].Biosystems engineering,2010,105(4):466-475.
[11]OBERNBERGER I,THEK G.Physical characterisation and chemical composition of densified biomass fuels with regard to their combustion behaviour[J].Biomass and bioenergy,2004,27(6):653-669.
[12]KALIYAN N,MOREY R V.Densification characteristics of corn stover and switchgrass[J].Transactions of the ASABE,2009,52(3):907-920.
[13]田潇瑜,侯振东,徐杨.玉米秸秆成型块微观结构研究[J].农业机械学报,2011,42(3):105-108.
[14]张林海,侯书林,田宜水,等.生物质固体成型燃料成型工艺进展研究[J].中国农机化,2012(5):87-91,100.
[15]肖雷,姚菁华,万永周,等.褐煤/生物质成型机理及工艺参数优化[J].中国矿业大学学报,2010,39(3):352-356.
[16]PENG J H,WANG J S,BI X T,et al.Effects of thermal treatment on energy density and hardness of torrefied wood pellets[J]. Fuel processing technology,2015,129:168-173.
[17]回彩娟.生物质燃料常温高压致密成型技术及成型机理研究[D].北京:北京林业大学,2006.
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