Environmental performance assessment of retrofitting existing coal fired power plants to co-firing with biomass: carbon footprint and emergy approach
Environmental performance assessment of retrofitting existing coal fired power plants to co-firing with biomass: carbon footprint and emergy approach
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DOI：
10.1016/j.jclepro.2014.08.019
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发表时间：
2015-09
影响因子：
11.1
通讯作者：
I. Andrić;N. Jamali-Zghal;M. Santarelli;B. Lacarrière;O. L. Corre
中科院分区：
文献类型：
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作者：
I. Andrić;N. Jamali-Zghal;M. Santarelli;B. Lacarrière;O. L. Corre
为了减少温室气体的排放，发达国家倾向于增加使用环境友好的可再生能源。将现有的燃煤冷凝式电厂改造为生物质混燃是一种普遍接受的减少对化石燃料依赖和二氧化碳减排的方法，为了确定混燃是否是一种环境友好的解决方案，使用了两种方法来涵盖电力生产过程中可能影响环境的所有重要方面：碳足迹和能值评估。选择这些环境核算方法是为了确定生物质的最大供应距离，使煤和生物质的混合燃烧比纯煤燃烧更环保。此外，考虑到煤燃烧的地质来源，考虑到原料创造的环境投入在整个history.The研究结果表明，添加约20%的生物质的燃烧混合物的质量导致减少二氧化碳排放量的近11-25%和总的能值流量为8- 15%。然而，进一步的结果表明，共烧过程是环境上可以接受的，如果生物质供应库存的最大供应距离所确定的区域内。然而，根据燃烧的煤类型，能值评估得出的供应区半径缩短了49-62%。此外，混合燃烧的能值负荷比低于纯煤燃烧（分别为10.65和12.39），表明混合燃烧过程对生态系统造成的压力较小。
To reduce the emission of greenhouse gasses, developed countries tend to increase the use of environmentally friendly renewable energy sources. Retrofitting of existing coal fired condensing power plants to co-firing with biomass is a generally accepted method for decreasing the dependency on fossil fuels and carbon-dioxide emission reductions.To determine if the co-firing is an environmentally friendly solution, two methods are used to cover all significant aspects of electricity production process that may influence the environment: carbon footprint and emergy evaluation. These environmentally accounting approaches were chosen to determine the maximum supply distance of biomass that allows the co-firing of coal and biomass to be more environmentally efficient than the pure coal combustion. Furthermore, geological origin of the coal combusted is taken into account, considering that the environmental inputs for feedstock creation varied throughout the history.The results of the study showed that the addition of approximately 20% biomass to the mass of the combustion mixture causes the decrease in carbon-dioxide emissions for nearly 11–25% and total emergy flow for 8–15%. However, further results indicate that the co-firing process is environmentally acceptable if the biomass supply stocks are within the area determined by maximum supply distances. Nevertheless, the supply area radius resulting from the emergy evaluation is 49–62% shorter depending on the coal type combusted. Furthermore, the emergy loading ratio of co-firing was lower than for the pure coal firing (10.65 compared to 12.39, respectively) indicating that the co-firing process causes less pressure on the ecosystem.