CAJ | 학술논문

为探讨循环流化床炉内受热面上飞灰的沉积特性,在热重分析仪上对有无水分条件下CaO在受热面上的碳酸化特性进行了研究,得到CaO的碳酸化反应速率和最终转化率.结果表明:水分对CaO的碳酸化进程有很大影响;当模拟烟气中存在水分时,CaO呈现出更快的碳酸化反应速率和更高的转化率,且随着温度的降低(由700℃降低到400℃),碳酸化反应得以改善的程度更加明显;温度越低,水分在CaO碳酸化反应中所起的作用越重要.最后,对该现象的反应机理进行了讨论.
위탐토순배류화상로내수열면상비회적침적특성,재열중분석의상대유무수분조건하CaO재수열면상적탄산화특성진행료연구,득도CaO적탄산화반응속솔화최종전화솔.결과표명:수분대CaO적탄산화진정유흔대영향;당모의연기중존재수분시,CaO정현출경쾌적탄산화반응속솔화경고적전화솔,차수착온도적강저(유700℃강저도400℃),탄산화반응득이개선적정도경가명현;온도월저,수분재CaO탄산화반응중소기적작용월중요.최후,대해현상적반응궤리진행료토론.
In order to analyze the characteristics of ash deposition on heat surfaces of circulated fluidized bed (CFB) boiler, carbonation properties of CaO on the surfaces were studied via a thermal gravimetric analyzer (TGA) under conditions with or without moisture content in the flue gas, and thus CaO carbonation reaction rate and final conversion ratio obtained. Results show that moisture content plays an important role in the carbonation process. Higher carbonation rate and conversion ratio can be achieved when moisture content exists in the flue gas, during which the improvement degree of CaO carbonation by moisture rises with the drop of temperature (from 700 to 400 ℃). The lower the temperature, the more important role the moisture content will play in the carbonation process). In addition, the carbonation mechanism was simultaneously analyzed.