Waste wood as bioenergy feedstock. Climate change impacts and related emission uncertainties from waste wood based energy systems in the UK
Waste wood as bioenergy feedstock. Climate change impacts and related emission uncertainties from waste wood based energy systems in the UK
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DOI：
10.1016/j.wasman.2017.11.042
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发表时间：
2018-04-01
期刊：
影响因子：
8.1
通讯作者：
Thornley, Patricia
中科院分区：
文献类型：
--
作者：
Roder, Mirjam;Thornley, Patricia
考虑到迫切需要转向低碳能源载体，废木材资源可以提供替代能源原料，同时减少垃圾填埋场的排放。这项研究探讨了气候变化的影响和相关的排放不确定性的废木材为基础的能源。为此，使用生命周期评估研究了不同等级的废木材和能源应用。敏感性分析，然后应用于供应链工艺和原料的主要排放贡献类别的属性：运输，加工，造粒，尿素树脂馏分和相关的N2 O的形成。结果表明，根据废弃木材的等级、转换方案、规模和相关参考案例，未经处理的木材废料的减排量可能高达91%。与此相比，来自低污染处理过的木材废料的能源可以实现高达83%的减排，类似于未经处理的废木颗粒，但在某些情况下，基于废木材的能源的排放量可能超过化石燃料参考的排放量-在最坏的情况下是126%。当从大规模煤炭和垃圾填埋场取代电力时，高度污染的原料的减排量最大，最高的排放不确定性与燃烧和造粒过程中木材的树脂部分和N2 O的形成有关。将木材加工与柴油和电力驱动的设备进行比较，结果也产生了很大的差异，而与运输有关的排放差异相对较小。使用经过处理的废木材作为生物能源原料可以减少能源生产的排放，但这只有在煤炭和垃圾填埋气被取代的情况下才能实现。为了实现符合国家和国际气候变化目标的有意义的减排，需要对废木材进行预处理，以减少能源转换过程中形成N2 O的成分。(C)2017爱思唯尔有限公司版权所有
Considering the urgent need to shift to low carbon energy carriers, waste wood resources could provide an alternative energy feedstock and at the same time reduce emissions from landfill. This research examines the climate change impacts and related emission uncertainties of waste wood based energy. For this, different grades of waste wood and energy application have been investigated using lifecycle assessment. Sensitivity analysis has then been applied for supply chain processes and feedstock properties for the main emission contributing categories: transport, processing, pelletizing, urea resin fraction and related N2O formation. The results show, depending on the waste wood grade, the conversion option, scale and the related reference case, that emission reductions of up to 91% are possible for non-treated wood waste. Compared to this, energy from treated wood waste with low contamination can achieve up to 83% emission savings, similar to untreated waste wood pellets, but in some cases emissions from waste wood based energy can exceed the ones of the fossil fuel reference- in the worst case by 126%. Emission reductions from highly contaminated feedstocks are largest when replacing electricity from large-scale coal and landfill, The highest emission uncertainties are related to the wood's resin fraction and N2O formation during combustion and, pelletizing. Comparing wood processing with diesel and electricity powered equipment also generated high variations in the results, while emission variations related to transport are relatively small. Using treated waste wood as a bioenergy feedstock can be a valid option to reduce emissions from energy production but this is only realisable if coal and landfill gas are replaced. To achieve meaningful emission reduction in line with national and international climate change targets, pretreatment of waste wood would be required to reduce components that form N2O during the energy conversion. (C) 2017 Elsevier Ltd. All rights reserved.