Strength, storage, and combustion characteristics of densified lignocellulosic biomass produced via torrefaction and hydrothermal carbonization
Strength, storage, and combustion characteristics of densified lignocellulosic biomass produced via torrefaction and hydrothermal carbonization
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DOI：
10.1016/j.apenergy.2014.08.094
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发表时间：
2014-12-15
期刊：
影响因子：
11.2
通讯作者：
Dutta, Animesh
中科院分区：
文献类型：
--
作者：
Kambo, Harpreet Singh;Dutta, Animesh
木质纤维素生物质具有生产可持续清洁绿色能源和其他生物基材料的潜力。然而，由于与煤相比，生物质的物理化学性质较差，因此不被认为是工业应用的理想原料。本研究评估了两种不同的热处理方法的可行性，即焙烧和水热碳化（HTC），然后是致密化。从芒草原料中获得的致密和预处理样品在强度，储存和燃烧性能方面进行了表征，用于能源应用。结果表明，这两种热预处理方法都是很有前途的生物质升级方法。然而，与原料和碳化颗粒相比，HTC颗粒表现出相当优越的物理化学性能。与原料颗粒(834 kg/m（3), 15.7 GJ/m(3)）和碳化颗粒(820 kg/m（3), 16.7 GJ/m(3)）相比，在260℃下通过HTC生产的颗粒的质量密度（单位体积质量）和体积能量密度（单位体积HHV）显着更高(1036 kg/m（3), 26.9 GJ/m(3)）。此外，HTC颗粒的疏水性得到改善，灰分含量降低，碱和碱土金属含量降低，碳含量显著增加。基于这些结果，HTC颗粒具有热能和电力应用的潜力，包括在没有任何重大修改的情况下取代现有燃煤发电厂的煤炭。(C) 2014 Elsevier Ltd.版权所有。
Lignocellulosic biomass has the potential to produce sustainable clean-green energy and other bio-based materials. However, due to the inferior physicochemical properties compared to coal, biomass is not regarded as an ideal feedstock for industrial applications. The work presented in this study evaluates the feasibility of two different thermal pre-treatments, torrefaction and hydrothermal carbonization (HTC), followed by densification. The densified and pretreated samples obtained from miscanthus feedstock were characterized in terms of the strength, storage, and combustion properties for energy applications. The results showed that both the thermal pre-treatments are promising methods for upgrading biomass. However, the HTC pellets showed considerably superior physicochemical properties when compared to the raw and torrefied pellets. The mass density (mass per unit volume) and volumetric energy density (HHV per unit volume) of the pellets produced via HTC at 260 degrees C was significantly higher (1036 kg/m(3), 26.9 GJ/m(3)) compared to raw pellets (834 kg/m(3), 15.7 GJ/m(3)) and torrefied pellets (820 kg/m(3), 16.7 GJ/m(3)). Moreover, the HTC pellets showed improved hydrophobicity, reduction in ash content, reduction in alkali and alkaline earth metal content, and a considerable increase in the carbon content. Based on these results, the HTC pellets have potential for the heat and power applications, including replacing coal in the existing coal-fired power plants without any significant modifications. (C) 2014 Elsevier Ltd. All rights reserved.