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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >PNAS Plus: Gasification of coal and biomass as a net carbon-negative power source for environment-friendly electricity generation in China
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PNAS Plus: Gasification of coal and biomass as a net carbon-negative power source for environment-friendly electricity generation in China

机译：PNAS Plus：将煤炭和生物质气化为中国环保发电的净碳负电源

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摘要

Realizing the goal of the Paris Agreement to limit global warming to 2 °C by the end of this century will most likely require deployment of carbon-negative technologies. It is particularly important that China, as the world’s top carbon emitter, avoids being locked into carbon-intensive, coal-fired power-generation technologies and undertakes a smooth transition from high- to negative-carbon electricity production. We focus here on deploying a combination of coal and biomass energy to produce electricity in China using an integrated gasification cycle system combined with carbon capture and storage (CBECCS). Such a system will also reduce air pollutant emissions, thus contributing to China’s near-term goal of improving air quality. We evaluate the bus-bar electricity-generation prices for CBECCS with mixing ratios of crop residues varying from 0 to 100%, as well as associated costs for carbon mitigation and cobenefits for air quality. We find that CBECCS systems employing a crop residue ratio of 35% could produce electricity with net-zero life-cycle emissions of greenhouse gases, with a levelized cost of electricity of no more than 9.2 US cents per kilowatt hour. A carbon price of approximately $52.0 per ton would make CBECCS cost-competitive with pulverized coal power plants. Therefore, our results provide critical insights for designing a CBECCS strategy in China to harness near-term air-quality cobenefits while laying the foundation for achieving negative carbon emissions in the long run.
机译：实现《巴黎协定》的目标是到本世纪末将全球变暖限制在2°C以内，这很可能需要部署负碳技术。尤其重要的是，中国作为世界上最大的碳排放国，避免陷入碳密集型燃煤发电技术中，并要实现从高碳到负碳发电的平稳过渡。我们将重点放在利用煤炭和生物质能的联合利用中国的综合气化循环系统和碳捕集与封存（CBECCS）来发电的过程中。这样的系统还将减少空气污染物的排放，从而有助于中国改善空气质量的近期目标。我们评估了CBECCS的母线发电价格，其中农作物残渣的混合比率从0％到100％不等，以及碳减排的相关成本和空气质量的协同效益。我们发现，采用35％的农作物残渣率的CBECCS系统可以产生电力，而温室气体的生命周期净排放为零，平均电费成本不超过每千瓦时9.2美分。每吨约52.0美元的碳价将使CBECCS在粉煤电厂中具有成本竞争力。因此，我们的结果为在中国设计CBECCS战略提供了重要的见识，以利用短期空气质量的协同效益，同时为长期实现负碳排放奠定基础。

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