固态发酵预处理木屑对其制备成型燃料的影响

Effect of pretreatment by solid-state fermentation of sawdust on the pelletization and pellet’s properties

摘要:

为了解决生物质成型产业存在的成型燃料密度低、强度低、抗吸水能力弱、不耐存储等问题，采用黄孢原毛平革菌Phanerochaete chrysosporium BKMF21767对黧蒴栲木屑 (Castanopsis fissa Rehd.et Wils) 进行固态发酵预处理，固态发酵木屑在含水率15%和最大压强98 MPa的条件下制备成型燃料。以成型能耗 (挤压和推动能耗)、成型燃料密度、Meyer强度和吸水性等表征发酵时间对黧蒴栲木屑成型行为及成型燃料性能的影响。结果表明：与由新鲜黧蒴栲木屑制备的成型燃料相比，经固态发酵的黧蒴栲木屑成型燃料的燃烧热值几乎不变，虽然在成型过程中的挤压能耗最高升高6.98%，但推动能耗最高可降低32.19%。同时，固态发酵预处理能够提高成型燃料的密度、Meyer强度和抗吸水能力，有利于成型燃料在长时间储运中保持品质，其中由固态发酵48 d左右的木屑制备的成型燃料品质最佳。

Abstract:

We pretreated sawdust (Castanopsis fissa Rehd.et Wils) by solid state fermentation (SSF) with Phanerochaete chrysosporium, and then compressed it into pellets with the moisture content of 15% and the pressure of 98 MPa, to solve the problem of low density, low Meyer hardness, high water uptake, and short storage period of pellet in the woody pellet industry. We studied the effects of fermentation time on pelletization and pellets’s characteristics (including energy consumption, density, Meyer hardness, and hydrophobicity). SSF affected the heating values of pellet. Compared with fresh sawdust, SSF consumed more energy at the maximal value by 6.98% but saved extrusion energy by 32.19% at the maximum. Meanwhile, SSF could improve the density, Meyer hardness and hydrophobicity of pellet. Pellet made of sawdust pretreated by SSF for 48 d had best quality, beneficial for long-term transportation and storage of pellets.