Thermodynamic Analysis and Optimization of an Oxyfuel Fluidized Bed Combustion Power Plant for CO<sub>2</sub> Capture

Yu, Ran; Chen, Shiyi; Xiang, Wenguo

doi:10.1021/acs.iecr.8b01498

Cited by 2 publications

(1 citation statement)

References 46 publications

(67 reference statements)

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“…Lim et al 44 developed a techno-economic analysis for 500 MWe ultrasupercritical steam power generation technology with circulating fluidized bed power plants with air combustion and oxycombustion in the presence of CO 2 capture. Yu et al 45 investigated the plant performance of two flue gas recirculation modes, wet and dry modes, under different operating conditions for a 600 MW supercritical oxyfuel fluidized bed combustion power plant. Their results show that the dry-mode plant has a net power efficiency of 31.6%, while the wet-mode plant has a net power efficiency of 31.5%.…”

Section: Introductionmentioning

confidence: 99%

Oxyfuel Combustion Makes Carbon Capture More Efficient

Talei,

Fozer,

Varbanov

et al. 2024

ACS Omega

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Fossil energy carriers cannot be totally replaced, especially if nuclear power stations are stopped and renewable energy is not available. To fulfill emission regulations, however, points such as emission sources should be addressed. Besides desulfurization, carbon capture and utilization have become increasingly important engineering activities. Oxyfuel technologies offer new options to reduce greenhouse gas emissions; however, the use of clean oxygen instead of air can be dangerous in the case of certain existing technologies. To replace the inert effect of nitrogen, carbon dioxide is mixed with oxygen gas in the case of such air combustion processes. In this work, the features of carbon capture in five different flue gases of air combustion and such oxyfuel combustion where additional carbon dioxide is mixed with clean oxygen are studied and compared. The five different flue gases originate from the gas-fired power plant, coal-fired power plant, coal-fired combined heat and power plant, the aluminum production industry, and the cement manufacturing industry. Monoethanolamine, which is an industrially preferred solvent for carbon dioxide capture from gas streams at low pressures, is selected as an absorbent, and the same amount of carbon dioxide is captured; that is, always that amount of carbon dioxide is captured, which is the result of the fossil combustion process. ASPEN Plus is used for mathematical modeling. The results show that the oxyfuel combustion cases need significantly less energy, especially at high carbon dioxide removal rates, e.g., higher than 90%, than that of the air combustion cases. The savings can even be as high as 84%. Moreover, 100% carbon capture was also be completed. This finding can be due to the fact that in the oxyfuel combustion cases, the carbon dioxide concentration is much higher than that of the air combustion cases because of the inert carbon dioxide and that higher carbon dioxide concentration results in a higher driving force for the mass transfer. The oxyfuel combustion processes also show another advantage over the air combustion processes since no nitrogen oxides are produced in the combustion process.

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Section: Introductionmentioning

confidence: 99%