以桉木屑为原料,考察了添加水解木质素对其成型特性的影响。在电子压力机上进行了单颗粒压缩成型试验,分析了水解木质素添加量、水分含量、压力、粒径对成型颗粒比能耗、松弛密度、Meyer强度的影响。结果表明,水解木质素的添加能够改善桉木屑的成型效果,添加20% ~ 30%为宜,在水分含量12% ~ 14%、压力6 000 ~ 7 000 N、粒径2 ~ 3 mm条件下的成型颗粒具有较好的品质。SEM结果显示,当添加量为20% ~ 30%时,水解木质素能够均匀地覆盖在粒子表面,在一定范围内提高压力和减小粒径能够使粒子间结合更加紧密。本研究可为桉木屑成型颗粒品质的改善提供一定理论指导。
Pelleting properties of eucalyptus sawdust were studied with addition of hydrolysis lignin. The single pellet compression experiments were conducted on an electronic pressure machine. The effect of parameters including hydrolysis lignin adding amount, moisture content, pressure, particle size on specific energy consumption, relaxed density, and Meyer Hardness were studied in detail. The results indicated that the addition of hydrolysis lignin can improve the performance of the pellets. The appropriate adding amount was 20% ~ 30%. The pellets had better quality with moisture content of 12% ~ 14%, pressure of 6 000 ~ 7 000 N, and particle size of 2 ~ 3 mm. Scanning electron microscopy images showed that the hydrolysis lignin can cover evenly on the surface of the particles when the adding amount was 20% ~ 30%. The particles could bind tighter when the pressure was increased and the particle size was decreased in a certain range. This work can provide some theoretical guidance for improving the quality of eucalyptus sawdust pellets.
[1] 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. DOI: 10.13348/j.cnki. sjlyyj.2011.04.015.
[2] 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.
[3] 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. DOI: 10.13987/j.cnki.askj.2013.04.011.
[4] 姜洋, 李伟振, 蒋恩臣, 等. 成型参数对桉树加工剩余物成型颗粒品质影响的实验研究[J]. 太阳能学报, 2017, 38(4): 900-905.
[5] STELTE W, HOLM J K, SANADI A R, et al.A study of bonding and failure mechanisms in fuel pellets from different biomass resources[J]. Biomass and bioenergy, 2011, 35(2): 910-918.
[6] CASTELLANO J M, GÓMEZ M, FERNÁNDEZ M, et al. Study on the effects of raw materials composition and pelletization conditions on the quality and properties of pellets obtained from different woody and non woody biomasses[J]. Fuel, 2015, 139: 629-636. DOI: 10.1016/j. fuel.2014.09.033.
[7] LEHTIKANGAS P.Quality properties of pelletised sawdust, logging residues and bark[J]. Biomass and bioenergy, 2001, 20(5): 351-360. DOI: 10.1016/S0961- 9534(00)00092-1.
[8] HOLM J K, STELTE W, POSSELT D, et al.Optimization of a multiparameter model for biomass pelletization to investigate temperature dependence and to facilitate fast testing of pelletization behavior[J]. Energy & fuels, 2011, 25(8): 3706-3711. DOI: 10.1021/ ef2005628.
[9] 王功亮, 姜洋, 李伟振, 等. 基于响应面法的玉米秸秆成型工艺优化[J]. 农业工程学报, 2016, 32(13): 223-227. DOI: 10.11975/j.issn.1002-6819.2016.13.032.
[10] 李伟振, 姜洋, 饶曙, 等. 玉米秸秆和木屑及木钠混配成型工艺参数优化[J]. 农业工程学报, 2018, 34(1): 198-203.
[11] LI H, JIANG L B, LI C Z, et al.Co-pelletization of sewage sludge and biomass: the energy input and properties of pellets[J]. Fuel processing technology, 2015, 132: 55-61. DOI: 10.1016/j.fuproc.2014.12.020.
[12] JIANG L B, LIANG J, YUAN X Z, et al.Co-pelletization of sewage sludge and biomass: the density and hardness of pellet[J]. Bioresource technology, 2014, 166: 435-443. DOI: 10.1016/j.biortech.2014.05.077.
[13] PENG J H, BI X T, LIM C J, et al.Sawdust as an effective binder for making torrefied pellets[J]. Applied energy, 2015, 157: 491-498. DOI: 10.1016/j.apenergy. 2015.06.024.
[14] 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. DOI: 10.1016/j.fuproc.2014.09.010.
[15] SUN Y, XING Y S, DING N, et al.Analysis on microstructure of cold-area corn Stover briquette densification fuel[J]. Journal of biobased materials and bioenergy, 2015, 9(4): 426-432. DOI: 10.1166/jbmb. 2015.1538.
[16] HUANG Y, FINELL M, LARSSON S, et al.Biofuel pellets made at low moisture content - influence of water in the binding mechanism of densified biomass[J]. Biomass and bioenergy, 2017, 98: 8-14. DOI: 10.1016/ j.biombioe.2017.01.002.
[17] STELTE W, HOLM J K, SANADI A R, et al.Fuel pellets from biomass: the importance of the pelletizing pressure and its dependency on the processing conditions[J]. Fuel, 2011, 90(11): 3285-3290. DOI: 10.1016/j.fuel.2011.05.011.
[18] HARUNA N Y, AFZALB M T.Effect of particle size on mechanical properties of pellets made from biomass blends[J]. Procedia engineering, 2016, 148: 93-99. DOI: 10.1016/j.proeng.2016.06.445.
[19] KALIYAN N, MOREY R V.Natural binders and solid bridge type binding mechanisms in briquettes and pellets made from corn Stover and switchgrass[J]. Bioresource technology, 2010, 101(3): 1082-1090. DOI: 10.1016/j. biortech.2009.08.064.
[20] LU D H, TABIL L G, WANG D C, et al.Experimental trials to make wheat straw pellets with wood residue and binders[J]. Biomass and bioenergy, 2014, 69: 287-296. DOI: 10.1016/j.biombioe.2014.07.029.
[21] 霍丽丽, 田宜水, 孟海波, 等. 生物质颗粒燃料微观成型机理[J]. 农业工程学报, 2011, 27(S1): 21-25.
[22] 饶曙, 李伟振, 姜洋, 等. 金针菇菌渣成型特性研究[J]. 华南农业大学学报, 2018, 39(2): 110-116. DOI: 10.7671/j.issn.1001-411X.2018.02.017.
