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

FUEL

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Article

Ali, Usman^1,3  Akram, Muhammad¹  Font-Palma, Carolina²  Ingham, Derek B.¹  Pourkashanian, Mohamed¹ 

[1] Univ Sheffield, Fac Engn, Energy Engn Grp, Energy 2050, Sheffield S10 2TN, S Yorkshire, England

[2] Univ Chester, Dept Chem Engn, Thornton Sci Pk, Chester CH2 4NU, Cheshire, England

[3] Univ Engn & Technol, Dept Chem Engn, Lahore 54890, Pakistan

关键词: Co-firing;    Post-combustion;    Part-load;    CO2 compression;    BECCS;   

DOI  :  10.1016/j.fuel.2017.09.023

来源: Elsevier

【 摘 要 】

Bioenergy with Carbon Capture and Storage (BECCS) is recognised as a key technology to mitigate CO2 emissions 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 CO2 capture, 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.

【 授权许可】

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