Bioeconomy Institute and ‡Department of Mechanical Engineering, Iowa State University , Ames, Iowa 50011, United States.
Environ Sci Technol. 2015 Dec 15;49(24):14688-95. doi: 10.1021/acs.est.5b03548. Epub 2015 Nov 24.
This study investigates a novel strategy of reducing carbon emissions from coal-fired power plants through co-firing bio-oil and sequestering biochar in agricultural lands. The heavy end fraction of bio-oil recovered from corn stover fast pyrolysis is blended and co-fired with bituminous coal to form a bio-oil co-firing fuel (BCF). Life-cycle greenhouse gas (GHG) emissions per kWh electricity produced vary from 1.02 to 0.26 kg CO2-eq among different cases, with BCF heavy end fractions ranging from 10% to 60%, which corresponds to a GHG emissions reduction of 2.9% to 74.9% compared with that from traditional bituminous coal power plants. We found a heavy end fraction between 34.8% and 37.3% is required to meet the Clean Power Plan's emission regulation for new coal-fired power plants. The minimum electricity selling prices are predicted to increase from 8.8 to 14.9 cents/kWh, with heavy end fractions ranging from 30% to 60%. A minimum carbon price of $67.4 ± 13 per metric ton of CO2-eq was estimated to make BCF power commercially viable for the base case. These results suggest that BCF co-firing is an attractive pathway for clean power generation in existing power plants with a potential for significant reductions in carbon emissions.
本研究探讨了一种通过在农业土地中混烧生物油和封存生物炭来减少燃煤电厂碳排放的新策略。从玉米秸秆快速热解中回收的生物油重质馏分与烟煤混合并共烧，形成生物油共烧燃料（BCF）。不同情况下，每千瓦时电力产生的生命周期温室气体（GHG）排放量从 1.02 到 0.26kg CO2-eq 不等，BCF 重质馏分范围从 10%到 60%，与传统烟煤电厂相比，GHG 排放量减少了 2.9%到 74.9%。我们发现，BCF 重质馏分需要在 34.8%到 37.3%之间，才能满足新燃煤电厂的清洁电力计划排放规定。预计最低售电价格将从 8.8 美分/kWh 增加到 14.9 美分/kWh，重质馏分范围从 30%到 60%。对于基础案例，估计最低碳价格为每公吨二氧化碳当量 67.4 美元±13 美元，以使 BCF 电力具有商业可行性。这些结果表明，BCF 共烧是现有电厂清洁发电的一种有吸引力的途径，有潜力大幅减少碳排放。
