A Life Cycle Assessment on a Fuel Production Through Distributed Biomass Gasification Process
A Life Cycle Assessment on a Fuel Production Through Distributed Biomass Gasification Process
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分布式生物质气化过程燃料生产的生命周期评估
DOI：
10.1541/ieejeiss.128.168
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发表时间：
2008
影响因子：
--
通讯作者：
Y. Genchi
中科院分区：
文献类型：
--
作者：
K. Dowaki;Tsutomu Eguchi;R. Ohkubo;Y. Genchi
本文采用自下而上的方法估算了生物质气化CGS、Bio-H2、Bio-MeOH（甲醇）和Bio-DME（二甲基醚）的生命周期清单（能源强度和二氧化碳排放量）。估算了物料破碎、运输和干燥过程中的二氧化碳排放量和能源强度。此外，蒙特卡罗模拟还考虑了生物质材料含水率和运输距离的不确定性。能源转换系统采用蓝塔工艺，采用CGS、PSA（变压吸收）系统或液化工艺进行气化。在我们的估算中，生物质材料为杉木的废弃物。水分含量和输送距离的不确定性分别为20 ~ 50wt .%和5 ~ 50km。生物质气化装置的能力为10 t-dry/d，即年吞吐量为3000 t-dry/年。每种情况下的生产能量作为一个功能单位。最终得到的能量强度为1.12 ~ 3.09 MJ/MJ， CO2排放量为4.79 ~ 88.0 g-CO2/MJ。CGS案例有助于环境缓解，与传统案例相比，Bio-H2和/或Bio-DME案例具有减少二氧化碳排放的潜力。
In this paper, we estimated life cycle inventories (energy intensities and CO2 emissions) on the biomass gasification CGS, Bio-H2, Bio-MeOH (methanol) and Bio-DME (di-methyl ether), using the bottom-up methodology.CO2 emissions and energy intensities on material's chipping, transportation and dryer operation were estimated. Also, the uncertainties on the moisture content of biomass materials and the transportation distance to the plant were considered by the Monte Carlo simulation. The energy conversion system was built up by gasification through the BLUE Tower process, with either CGS, PSA (Pressure Swing Absorption) system or the liquefaction process.In our estimation, the biomass materials were the waste products from Japanese Cedar. The uncertainties of moisture content and transportation distance were assumed to be 20 to 50 wt.% and 5 to 50 km, respectively. The capability of the biomass gasification plant was 10 t-dry/d, that is, an annual throughput of 3,000 t-dry/yr. The production energy in each case was used as a functional unit.Finally, the energy intensities of 1.12 to 3.09 MJ/MJ and CO2 emissions of 4.79 to 88.0 g-CO2/MJ were obtained. CGS case contributes to the environmental mitigation, and Bio-H2 and/or Bio-DME cases have a potential to reduce CO2 emissions, compared to the conventional ones.