Flue gas treatment by power-to-gas integration for methane and ammonia synthesis - Energy and environmental analysis
Flue gas treatment by power-to-gas integration for methane and ammonia synthesis - Energy and environmental analysis
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DOI：
10.1016/j.enconman.2018.06.025
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发表时间：
2018-09-01
影响因子：
10.4
通讯作者：
Rossi, Federico
中科院分区：
文献类型：
--
作者：
Castellani, Beatrice;Rinaldi, Sara;Rossi, Federico
本文旨在评估一种以烟道气作为氮气和二氧化碳原料的二氧化碳循环创新工艺的碳足迹和能源足迹。氮气通过哈伯-博世工艺转化为氨，二氧化碳通过萨巴捷反应转化为甲烷，使用可再生电力过剩产生的氢气。基于与电解制氢、Sabatier反应合成甲烷、烟气分离、二氧化碳甲烷化和氨合成工艺单元的能耗和能量输出相关的实验数据，评估了该工艺的碳足迹和能量足迹分析。生命周期评估方法的应用，实验和计算数据的基础上，无论是在可再生电力过剩的情况下，从电网的电力。结果表明，在可再生电力过剩的情况下，对于1 kg经处理的烟气的功能单元，比碳足迹为0.7819 kg（CO2当量），能量足迹为50.73 MJ，分别对应于每1 kg产生的氢气4.012 kg和260.3 MJ。在电网供电的情况下，比碳足迹为1.550 kg（CO2当量），能量足迹为59.12 MJ/烟气质量单位。如果碳足迹为正，则该过程间接导致避免的排放量为0.673至0.844千克（二氧化碳当量）千克（气溶胶）（-1），从而证明了拟议途径的可持续性。
The present paper aims at assessing the carbon and energy footprint of an innovative process for carbon dioxide recycling, with flue gas as feedstock of nitrogen and carbon dioxide. Nitrogen is converted into ammonia through the Haber-Bosch process and carbon dioxide into methane via Sabatier reaction using hydrogen produced by renewable electricity excess. Carbon and energy footprint analysis of the process was assessed based on experimental data related to hydrogen production by electrolysis, methane synthesis via Sabatier reaction, energy consumption and energy output of the process units for flue gas separation, carbon dioxide methanation and ammonia synthesis. A Life Cycle Assessment method is applied, based on the experimental and computational data, both in case of renewable electricity excess and electricity from the grid. Results show that in case of renewable electricity excess, for a functional unit of 1 kg of treated flue gas, the specific carbon footprint is 0.7819 kg(CO2eq) and energy footprint is 50.73 MJ, which correspond to 4.012 kg and 260.3 MJ per 1 kg of produced hydrogen. In case of electricity from the grid, the specific carbon footprint is 1.550 kg(CO2eq), and energy footprint is 59.12 MJ per flue gas mass unit. If the carbon footprint is positive, the process indirectly leads to avoided emissions, ranging from 0.673 to 0.844 kg(CO2eq) kg(flugas)(-1), thus proving the sustainability of the proposed pathway.