Abstract The global destructive effects of carbon dioxide emissions and the importance of energy storage for grid stability and peak shaving applications are in deep concern. In this regard, this paper investigates the recycling of carbon dioxide from gas-fired power plant emissions into synthetic natural gas based on a novel power-to-gas process with the aim of chemical energy storage and emission reduction. The hybrid power-to-gas process proposed in this paper integrates the power generated from the gas plant and renewable energies. To make a precise evaluation of system performance, the referenced system is analyzed from technical, economic, and environmental points of view. The process is optimized through the reaction operation conditions and the energy utilization of the process. The results demonstrate that the power-to-gas process achieves a reaction synthetic natural gas production yield of over 97% at the optimal operation conditions. Regarding energy and environmental outlook, the power plant provides 15.4% of the power-to-gas total energy consumption, with the remaining 84.6% supplied from renewable energy resources. From the synthetic natural gas produced, the power-to-gas process provides total annual energy storage of 2.9 × 107 GJ and recycles 1.6 Mton of carbon dioxide for the power plant flues, resulting in a reduction of the plant emissions by around 66%. According to the economic data, with the consideration of the selling price of oxygen, the cost of the synthetic natural gas produced results in 1738 $/ton. The obtained results indicate that the system designed can reduce production costs due to hybrid electricity and offers two unique attributes: energy storage capability and drastic reduction of carbon dioxide emissions.

中文翻译：

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某大型电厂以捕集二氧化碳为原料的电转气储能装置综合分析

摘要 二氧化碳排放对全球的破坏性影响以及储能对电网稳定性和调峰应用的重要性备受关注。在这方面，本文研究了基于新型电转气工艺将燃气电厂排放的二氧化碳回收为合成天然气，以实现化学储能和减排。本文提出的混合电转气工艺整合了燃气发电厂产生的电力和可再生能源。为了对系统性能进行精确评估，参考系统从技术、经济和环境的角度进行分析。该工艺通过反应操作条件和工艺的能量利用进行优化。结果表明，电转气工艺在最佳运行条件下实现了97%以上的反应合成天然气产率。在能源和环境前景方面，发电厂提供电转气总能源消耗的 15.4%，其余 84.6% 来自可再生能源。从生产的合成天然气中，电转气工艺可提供每年 2.9 × 107 GJ 的总能量存储，并为电厂烟道回收 1.6 吨二氧化碳，从而使电厂排放量减少约 66%。根据经济数据，考虑到氧气的销售价格，生产的合成天然气成本为1738美元/吨。