DataSheet3_Techno-Economic Evaluation of Biological and Fluidised-Bed Based Methanation Process Chains for Grid-Ready Biomethane Production.pdf

Three different power-to-methane process chains with grid injection in two scales (1 MWel and 6 MWel) were analysed regarding their investment and operation cost. The process chains were based on biological or catalytic bubbling fluidised bed methanation in combination with proton exchange membrane or solid oxide electrolyser cells. A bottom-up techno-economic analysis showed a cost benefit of around 17–19% lower biomethane production cost for the bubbling fluidised bed technology as less than a third of the reactor volumes is required for catalytic methanation. This cost benefit is only given in combination with PEM electrolysis, as the high-temperature electrolyser stacks currently result in high investment cost. Based on electricity cost of 5 €-ct/kWhel and a plant size of 6 MWel, biomethane production cost of 13.95 €-ct./kWh for catalytic and 17.30 €-ct/kWh for biological methanation could be obtained, both including PEM electrolysis. A significant efficiency increase by integrating the heat of catalytic methanation reaction with the high-temperature electrolysis can be achieved; however investment cost have to decrease below 1000 €/kWel to obtain economically feasible production cost of biomethane. Under current economic and technological circumstances, CO2 methanation using the bubbling fluidised bed technology is the most cost effective.

针对三种不同的电力转化为甲烷工艺流程，在两个规模（1兆瓦电和6兆瓦电）范围内进行了投资及运营成本分析。这些工艺流程基于生物或催化沸腾床甲烷化，并与质子交换膜或固体氧化物电解池相结合。自下而上的技术经济分析表明，沸腾床技术相较于催化甲烷化仅需不到三分之一的反应器体积，其生物甲烷生产成本可降低约17%至19%。然而，这种成本效益仅在质子交换膜电解的配合下才能实现，因为目前高温电解池堆栈导致投资成本较高。以每千瓦时5欧元的价格和6兆瓦电的工厂规模计算，催化和生物甲烷化生产的生物甲烷成本分别为13.95欧元每千瓦时和17.30欧元每千瓦时，两者均包含质子交换膜电解。通过整合催化甲烷化反应的热量与高温电解，可以实现显著的效率提升；然而，为了获得经济可行的生物甲烷生产成本，投资成本必须降低至每千瓦电1000欧元以下。在当前的经济和技术环境下，利用沸腾床技术进行二氧化碳甲烷化是最具成本效益的途径。