【摘要】 定义电站燃煤锅炉最低无油稳燃负荷为燃烧稳定性指数CSI等于一临界值(推荐为0.05)时的负荷水平。采用气体可燃极限概念对传统的简单化学反应系统模型进行修正后,针对一台200MW电站锅炉在挥发分含量分别为10%,20%,30%时的最低无油稳燃烧负荷进行了预测计算,结果表明:随着挥发分增加,最低无油稳燃负荷变低。并预测计基金项目:国家自然科学基金资助项目(编号59476026)。算了不同挥发分含量下稳定燃烧所需煤质的最低发热量,结果与我国电厂运行经验得到的最低煤质特性曲线基本一致更多还原

【Abstract】 Any combustion process in utility boilers could not avoid to be influenced by fluctuations of fuel feed rate. The Minimum Load of Operation, MLO, is just the load under which the combustion process can overcome a certain degree of normal fluctuation of fuel feed rate without firing oil, when CSI, a combustion stability index proposed by the authors, equals a critical value (as 0.05 recommended in this paper). In order to predict the value of MLO by using a three dimensional simulation computer code for combustion processes, the simple, chemical reaction system model has been modified by means of the concept of lean flammability of gases.The three dimensional combustion simulation computer code integrated with the modified model was used to analyze the combustion process in a 200MW pulverized coal fired utility boiler under different load levels for three different contents of volatile matter of 10%, 20% and 30%. The results showed that as the content of volatile matter increases, the MLO decreases. In addition, the Minimum Coal Quality, which is the lowest heat value of coal varied with volatile content for stable combustion, is also predicted. The identity of the results with general operation experiences has verified our methods.更多还原