MOE Engineering Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China.
MOE Engineering Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China.
Sci Total Environ. 2020 May 10;716:136915. doi: 10.1016/j.scitotenv.2020.136915. Epub 2020 Jan 24.
The limited quality of liquid product from the fast pyrolysis of biomass resources is a great obstacle to its large-scale application. Herein, a distributed-centralized agricultural straw pyrolysis (DCP) system with products of high market acceptance was implemented based on the design of a pilot plant and previous research. The system consisted of distributed pyrolysis workshops and a centralized upgrading factory that involved crude oil separation, hydrogen production, and hydrorefining. The crude fuel was separated by distillation before hydrotreatment, which avoids external hydrogen and energy consumption compared with direct hydrotreatment, and the hydrotreatment unit is independent of external hydrogen supply. The environmental impacts of a specific case designed for the northern region of Shandong province in China were evaluated using a life cycle assessment (LCA) method. LCA results indicated that abiotic depletion potential, acidification potential, global warming potential, ozone layer depletion potential, and human toxicity potential were primarily from fuel combustion, electricity, and N fertilizer. Eutrophication potential was primarily from the biomass production stage. Results demonstrated that the GWP of the system was -0.62 kg CO per kg crop straw. Comparison with the conventional straw incorporation method indicated the economic and social benefits of the DCP system, which is thus expected to be a promising option for crop residue disposal.
生物质资源快速热解产生的液体产物质量有限，这极大地阻碍了其大规模应用。在此，基于中试装置和前期研究成果，设计了分布式-集中式农业秸秆热解（DCP）系统，以生产具有高市场接受度的产品。该系统由分布式热解车间和集中式升级工厂组成，涉及原油分离、制氢和加氢精制。在加氢处理之前，通过蒸馏对粗燃料进行分离，与直接加氢处理相比，避免了外部氢气和能源消耗，并且加氢处理单元独立于外部氢气供应。采用生命周期评价（LCA）方法对为中国山东省北部设计的特定案例的环境影响进行了评估。LCA 结果表明，非生物耗竭潜势、酸化潜势、全球变暖潜势、臭氧消耗潜势和人体毒性潜势主要来自燃料燃烧、电力和氮肥。富营养化潜势主要来自生物质生产阶段。结果表明，该系统的全球变暖潜势为-0.62kg CO/kg 作物秸秆。与传统的秸秆还田方法相比，DCP 系统具有明显的经济效益和社会效益，有望成为一种有前途的作物秸秆处理方法。
