【摘要】 基于钙基载碳体在高温下循环吸收和解析CO₂的基本原理，开展350 MW超临界循环流化床燃煤机组锅炉烟气CO₂捕集系统的方案设计和计算研究。提出采用双循环床作为碳酸化反应器和煅烧反应器内的设计流态，并增加再碳酸化反应器提高碳捕集效率。建立碳酸化反应器和煅烧反应器之间循环物料的质量和能量守恒方程，计算与分析不同锅炉负荷下的关键性能参数。在锅炉最大连续出力工况下，当碳捕集效率为90%时，锅炉烟气CO₂体积分数从13.64%降低到1.4%,捕集到的湿烟气CO₂体积分数为76.60%,经过冷凝后，干烟气中CO₂体积分数可达到97.04%。研究得出常规CFB燃煤机组耦合钙循环系统实现锅炉烟气CO₂高效捕集的综合方案，为今后燃煤发电厂碳捕集技术路线的选择提供参考。更多还原

【Abstract】 Based on the fundamental principle of cyclic CO₂ absorption and release by calcium-based sorbents at high temperatures, the scheme design and calculation research of CO₂ capture system for boiler flue gas of 350MW supercritical circulating fluidized bed（CFB） coal-fired unit are carried out. A design employing dual circulating fluidized beds as the fluidization regime within the carbonator and calciner is proposed, with an additional recarbonation reactor integrated to enhance carbon capture efficiency. Mass and energy conservation equations for circulating materials between the carbonator and calciner are established to calculate and analyze key performance parameters under varying boiler loads. Under boiler maximum continuous rating conditions with 90% carbon capture efficiency, the CO₂ concentration in the boiler flue gas is reduced from 13.64% to 1.4%. The captured wet flue gas exhibits a CO₂ concentration of 76.60%, which can be enriched to 97.04% in dry flue gas after condensation. This preliminary research presents an integrated solution for efficient CO₂ capture from boiler flue gas in conventional CFB coal-fired units coupled with a calcium looping system, providing a reference for selecting carbon capture technological pathways in future coal-fired power plants.更多还原