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与常规煤粉燃烧相比，循环流化床的特点在于：首先，床内存在大量并不断循环的物料，其质量、粒度分布、循环程度、浓度分布、热容量等对动态特性有重大影响；其次，床料内存在着大量的未燃尽残碳，其动态燃烧及消耗过程以及燃烧放热位置对炉温及其分布影响很大。针对上述特点，建立了以给煤量、给风量、排渣量为输入的动态数学模型，它由氧质量平衡、残碳动态燃烧过程的碳质量平衡、挥发份燃烧及残碳燃烧的动态能量平衡以及以排渣量为主动操作量的动态床料质量平衡４个方程组成。计算结果表明：该模型能够正确地反映各种操作量变化时循环流化床的动态特性，而且计算速度满足实时要求。图１参２
Compared with conventional pulverized coal combustion, circulating fluidized bed is characterized by: First, there is a large number of continuous circulating material in the bed, and its quality, particle size distribution, degree of circulation, concentration distribution, heat capacity and other dynamic properties have a significant impact; There is a large amount of unburned residual carbon in the bed material, and its dynamic combustion and consumption processes as well as the location of combustion and heat release have a great influence on the furnace temperature and its distribution. In view of the above characteristics, a dynamic mathematical model with inputs of coal supply, air supply and slag discharge is established. It is composed of the balance of oxygen mass, the balance of carbon mass in the residual carbon dynamic combustion process, the dynamic energy of volatile combustion and residual carbon combustion Balance and take the initiative for the amount of slag discharge dynamic bed mass balance of four equations. The results show that the model can correctly reflect the dynamic characteristics of circulating fluidized bed with various operating variables, and the calculation speed can meet the real-time requirements. Figure 1 reference 2