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

Ali, Usman; Akram, Muhammad; Font-Palma, Carolina; Ingham, Derek B.; Pourkashanian, Mohamed

Abstract

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.

Citation

Ali, U., Akram, M., Font-Palma, C., Ingham, D. B., & Pourkashanian, M. (2017). 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, 210, 873-884. https://doi.org/10.1016/j.fuel.2017.09.023

• Journal Article Type: Article
• Acceptance Date: Sep 7, 2017
• Online Publication Date: Sep 18, 2017
• Publication Date: Dec 15, 2017
• Deposit Date: Feb 9, 2021
• Journal: Fuel
• Print ISSN: 0016-2361
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 210
• Pages: 873-884
• DOI: https://doi.org/10.1016/j.fuel.2017.09.023
• Keywords: Co-firing; Post-combustion; Part-load; CO2 compression; BECCS
• Public URL: https://hull-repository.worktribe.com/output/3689385
• Related Public URLs: https://chesterrep.openrepository.com/handle/10034/620632
• Additional Information: This article is maintained by: Elsevier; Article Title: 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; Journal Title: Fuel; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.fuel.2017.09.023; Content Type: article; Copyright: © 2017 Elsevier Ltd. All rights reserved.