Parametric Optimization for Power De-Rate Reduction in the Integrated Coal-Fired Power Plant with Carbon Capture and Storage

Abstract

Carbon capture and storage (CCS) has attracted worldwide attention as a near-term technology to decelerate global warming. Postcombustion CO 2 capture utilizes existing coal-fired power plants, and aqueous monoethanolamine (MEA) scrubbing is the most common capture technology. However, the heat and energy requirements of solvent regeneration and CO 2 liquefaction cause a 30% decrease in net power output. This power de-rate is a major obstacle to implementing CCS. In this study, simulation-based parametric optimization was performed to minimize the power de-rate. Postcombustion CO 2 capture with aqueous MEA scrubbing (85%, 90%, and 95% removals) and CO 2 liquefaction integrated with a 550 MWe supercritical coal-fired power plant was simulated. The liquid to gas ratio and stripper operating pressure of the CO 2 capture process were the manipulated variables with steam extracted from the intermediate pressure−low pressure crossover pipe and the first low pressure turbine as possible heat sources. The power de-rate was reduced to 17.7% when operating at optimum conditions.

Gas–Solid Hydrodynamics and Combustion Characteristics in a 600 MW Annular CFB Boiler for Supercritical CO2 Cycles

“…Besides, for researching and developing advanced materials and devices for ultrahigh vapor parameter coal-fired power generation (700 °C projects) and optimizing the control strategies and technologies for plant operations, exploration of new power cycles with higher efficiency has also become an important technical way to break through the bottleneck of coal-fired generation processes. Recently, the supercritical carbon dioxide (S-CO 2 ) power cycle, which has been widely applied in nuclear energy, concentrated solar energy (CSP), ship propulsion system, and waste heat recovery, − has been receiving increasing interest in the field of fossil-fired generation in consideration of its high efficiency, compact structure, stable physical properties, and qualitative flexibility. − Studies indicated that the S-CO 2 coal-fired power cycle can offer about 6% lower heating value (LHV) and relative efficiency improvement performances theoretically compared with the steam cycle, which attracts great interest and potential to be applied in the coal-fired power generation industry.…”