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在富氧燃烧条件下,CaO碳酸化的发生会使循环流化床高温受热面易积灰结垢,进一步影响其传热特性。在热天平实验台模拟富氧气氛下,探寻温度和CO2浓度对CaO碳酸化反应速率及最终转化率的影响规律。通过实验结果分析发现,温度是决定碳酸化反应速率快慢及最终转化率高低的主要因素,在400~700℃内,温度升高会加快反应速率并提高最终转化率。同时发现,CO2浓度增加可加快化学反应阶段速率,但最终转化率相差不大。
Under the condition of oxy-fuel combustion, the occurrence of CaO carbonation will fouling and fouling the heated surface of the circulating fluidized bed, further affecting the heat transfer characteristics. In the thermobalance experiment platform simulated oxygen-enriched atmosphere, to explore the temperature and CO2 concentration CaO carbonation reaction rate and the final conversion rate of the law. The experimental results show that temperature is the main factor that determines the rate of carbonation reaction and the final conversion rate. In the range of 400-700 ℃, the increase of temperature will accelerate the reaction rate and increase the final conversion rate. It was also found that the increase of CO2 concentration can speed up the chemical reaction stage, but the final conversion rate is not big difference.