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首页> 外文期刊>Energy Conversion & Management >Techno-economic assessment of coal- or biomass-fired oxy-combustion power plants with supercritical carbon dioxide cycle
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Techno-economic assessment of coal- or biomass-fired oxy-combustion power plants with supercritical carbon dioxide cycle

机译：具有超临界二氧化碳循环的煤矿或生物质燃烧氧气燃烧厂的技术经济评估

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Oxy-fuel combustion is regarded as a feasible technology that can contribute towards decarbonisation of the power industry. Although it has been shown that oxy-fuel combustion results in lower carbon dioxide emissions at a lower cost of carbon dioxide captured compared to the mature amine scrubbing process, its implementation still results in high economic penalties. This study proposes to replace the conventional steam cycle in the state-of-the-art oxy-combustion coal-fired power plants with the supercritical carbon dioxide cycle to reduce both economic and efficiency penalties. In addition, in order to further reduce carbon dioxide emissions, biomass is considered as a replacement fuel for coal in the oxy-fuel combustion power plant and the proposed process becomes a type of bio-energy with carbon capture and storage. The process models were developed in Aspen Plus (TM) to assess techno-economic feasibility of the considered processes. The results showed that on replacement of the conventional steam cycle with the supercritical carbon dioxide cycle, the efficiency penalties were reduced by up to 2% points and the levelised cost of electricity was reduced up to 4.6% (4.1 (sic)/MWh). Moreover, when biomass was used as a fuel, the net efficiency penalties increased by 0.5% points and the levelised cost of electricity increased by 24.4 (sic)/MWh. Although techno-economic performance in this case was less favourable under no carbon tax conditions, using biomass resulted in significant negative carbon dioxide emissions (-3.70 megatonnes of carbon dioxide per annum). Such negative emissions can offset carbon dioxide emissions from other sources that are relatively difficult to decarbonise. If the carbon tax is above 24 (sic) per tonne of carbon dioxide, bio-energy with carbon capture and storage became more economically feasible than fossil fuel with carbon capture and storage.
机译：氧燃料燃烧被认为是一种可行的技术，可以促进电力行业的脱碳。虽然已经表明，与成熟的胺洗涤过程相比，氧燃料燃烧导致较低的二氧化碳成本下的二氧化碳排放，其实施仍然导致高经济处罚。本研究提出以超临界二氧化碳循环在最先进的氧气燃烧发电厂中取代传统的蒸汽循环，以减少经济和效率的惩罚。此外，为了进一步降低二氧化碳排放，将生物质被认为是氧气燃烧电厂中煤的替代燃料，并且所提出的方法成为一种具有碳捕获和储存的生物能量。该过程模型是在Aspen Plus（TM）中开发的，以评估所考虑的过程的技术经济可行性。结果表明，在用超临界二氧化碳循环替代常规蒸汽循环时，效率损失降低了高达2％的罚球，电力调用成本降低至4.6％（4.1（SiC）/ MWH）。此外，当生物质用作燃料时，净效率的惩罚增加0.5％，电力调用成本增加24.4（SIC）/ MWH。尽管在这种情况下，在这种情况下的技术经济表现在无碳税不受碳税不利，但使用生物质导致显着的负二氧化碳排放（每年的二氧化碳 - 3.70兆甘蔗酯）。这种负排放可以抵消来自相对难以脱碳的其他来源的二氧化碳排放。如果碳税高于每吨二氧化碳的24（SiC），则具有碳捕获和储存的生物能量比具有碳捕获和储存的化石燃料更经济地可行。

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