摘要
以棉秆、木屑为研究对象,分别将2种单一生物质原料和二者质量比为1∶1的混合原料进行热压成型,利用热重分析仪考察成型燃料的燃烧性能,并通过差示扫描量热仪、电子万能试验机研究不同成型温度和成型压力条件下成型燃料物理性质的变化规律,以反映草本生物质与木本生物质的成型规律及燃料物性的差异。结果表明:棉秆成型燃料燃烧性能较好,但灰分产率较大、热值较低,将2种生物质原料混合制得的成型燃料综合燃烧性能较好。随着成型温度的升高(室温~105℃),成型燃料的表观密度和抗压强度均呈先增后减的趋势,其中棉秆成型燃料的表观密度增幅较小,而抗压强度增幅较大,且远大于木屑成型燃料,但在木屑中掺混棉秆并未使混合成型燃料的抗压强度得到有效提高。随着成型压力的增大(40~80MPa),成型燃料的表观密度和抗压强度均呈增强的趋势,其中棉秆及混合成型燃料的表观密度和抗压强度增幅均较大,而木屑成型燃料的增幅较小。
Biomass briquette was prepared from sawdust(S),cotton stalk(CS)and their mixed material(S-CS,massratio 1∶1)using hot compression.The combustion characteristicsof the briquette were studied by TG,and the physicalproperties were analyzed by DSC and electron universal testing machine to investigate the different in the formingcharacteristics and briquette quality of the biomass briquettes prepared from the woody and herbaceous biomass withdifferent forming pressure and temperature.The results show that CS briquette is characteristic of better combustioncharacteristics,higher ash yield and lower heating value than sawdust briquette is.S-CS briquette has the bestcomprehensive combustion performance.With the increase in the forming temperature from room temprature to 105 ℃,the bulk density and the compression strength of the briquette increase firstly and then decrease.Compared to thesawdust briquette,CS briquette has the lower increasing degree of the bulk density and the higher one of the compressionstrength.The CS addition gives a little contribution to the increase in the physical properties of S-CS briquette comparedwith the sawdust briquette.With the increasing forming pressure from 40 MPa to 80 MPa,the physical properties of allbriquettes increase and the increasing degree of CS and S-CS briquettes is higher than that of sawdust briquette.
引文
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