Innovative performance evaluation and process simulation of a 550 MW staged, pressurized oxy-biomass combustion power plant for negative carbon emissions

[Geoengineering News]

https://www.sciencedirect.com/science/article/abs/pii/S0960148125021986

Authors: Xiangdong Li, Hui Lin, Guan Wang, Gaofeng Dai, Yongqiang Chen, Yong Luo, Bin Liu, Jiaye Zhang, Richard L. Axelbaum, Xuebin Wang a

29 September 2025

https://doi.org/10.1016/j.renene.2025.124534

Abstract

Bioenergy with carbon capture and storage (BECCS) technology is crucial for improving carbon capture efficiency but faces challenges due to high electricity costs. Staged, pressurized oxy-combustion addresses this by efficiently recovering latent heat from flue gas within the steam Rankine cycle, improving net plant efficiency in power plants. Integrating biomass with this technology holds promise for reducing fossil fuel consumption and achieving negative carbon emissions. However, the performance of staged pressurized oxy-biomass combustion (Bio-SPOC) has not been studied yet. This study used ASPEN Plus to analyze the performance of a 550 MW staged, pressurized oxy-biomass combustion power plant. The results indicate that air separation unit (ASU) is the main energy consumption unit. As pressure increases, net plant efficiency (NPE) increases firstly and then drops, with the maximum of 38.03 % (LHV) at 1 MPa. When O2 concentration in flue gas reduces from 3 % to 1 % NPE increases from 37.82 % (LHV) to 38.42 % (LHV). The NPE of Bio-SPOC is 4.26 % higher than that of coal. This improvement is mainly due to the higher moisture in Bio-SPOC flue gas, allowing for more latent heat recovery. Additionally, biomass has a higher oxygen content, resulting in lower ASU energy consumption. These findings provide technical support for the promotion and application of Bio-SPOC technology.

Source: ScienceDirect 

[Michael Hayes]

If the biomass is aquatic-based, the C math would likely improve as growing aquatic plants can adjusts the water pH. Moreover, if biochar production can be engineered into the operations, that would stack a land-based CDR value on top of the aquatic-based CDR systems. 

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