Part-load performance of direct-firing and co-firing of coal and biomass in a power generation system integrated with a CO2 capture and compression system
Part-load performance of direct-firing and co-firing of coal and biomass in a power generation system integrated with a CO2 capture and compression system
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DOI：
10.1016/j.fuel.2017.09.023
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发表时间：
2017-12
期刊：
影响因子：
7.4
通讯作者：
Usman Ali;M. Akram;C. Font-Palma;D. Ingham;M. Pourkashanian
中科院分区：
文献类型：
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作者：
Usman Ali;M. Akram;C. Font-Palma;D. Ingham;M. Pourkashanian
生物能源与碳捕获和储存（BECCS）被认为是减少二氧化碳排放和实现严格气候目标的关键技术，因为它具有负排放的潜力。然而，其部署成本预计将高于采用CCS的化石燃料发电厂。为了帮助过渡到完全取代化石燃料，煤和生物质的混合燃烧提供了一种更便宜的方法。因此，这项工作探讨了在燃烧后CO2捕集粉碎超临界电厂在各个级别的共烧，使用完全集成的模型开发的白杨加。混合燃烧在所需的生物质资源方面提供了灵活性。这项工作还研究了操作中的灵活性。因此，研究了发电厂在各种部分负荷（40%、60%和80%）下的性能，并与使用恒定燃料流量的100%下的基线进行了比较。结果发现，净功率输出和净效率降低时，生物质分数增加恒定的热量输入和恒定的燃料流量的情况下。在恒定的热输入下，随着生物质分数的增加，需要更多的燃料;而在恒定的燃料输入下，发生降额，例如，与燃烧100%煤相比，燃烧100%生物质时的功率输出能力降低30%。煤和生物质的混合燃烧导致每次部分负荷运行时的功率大幅降低。
Bioenergy with Carbon Capture and Storage (BECCS) is recognised as a key technology to mitigate CO2emissions and achieve stringent climate targets due to its potential for negative emissions. However, the cost for its deployment is expected to be higher than for fossil-based power plants with CCS. To help in the transition to fully replace fossil fuels, co-firing of coal and biomass provide a less expensive means. Therefore, this work examines the co-firing at various levels in a pulverised supercritical power plant with post-combustion CO2capture, using a fully integrated model developed in Aspen Plus. Co-firing offers flexibility in terms of the biomass resources needed. This work also investigates flexibility within operation. As a result, the performance of the power plant at various part-loads (40%, 60% and 80%) is studied and compared to the baseline at 100%, using a constant fuel flowrate. It was found that the net power output and net efficiency decrease when the biomass fraction increases for constant heat input and constant fuel flow rate cases. At constant heat input, more fuel is required as the biomass fraction is increased; whilst at constant fuel input, derating occurs, e.g. 30% derating of the power output capacity at firing 100% biomass compared to 100% coal. Co-firing of coal and biomass resulted in substantial power derating at each part-load operation.