循环流化床锅炉燃烧过程预测控制与经济性能优化

摘要

For the combustion process of industrial circulating fluidized bed boiler (CFBB) with nonlinearity, time-variation, strong delay and multivariable coupling, considering how to satisfy the economic target with decreasing power consumption, an two level multivariable predictive control (MPC) method was proposed. The method based on the constrained control of main steam pressure, bed temperature and flue gas oxygen content is constructed to optimize the economic target. The industrial application result demonstrates that the proposed method can decrease the coal consumption of unit steam while assuring the steady of the main process parameters of the boiler combustion and bring high economical profit.%针对循环流化床锅炉燃烧过程多变量耦合、时滞、非线性等复杂过程特性和经济运行要求，提出了一种结合经济性能优化与多变量控制的双层预测控制策略，可在实现主蒸汽压力、料床温度和烟气含氧量约束控制的基础上，优化燃烧过程的经济性能。工业应用实例表明，该控制策略不仅能有效提高燃烧过程主要工艺参数的平稳性，而且能降低单位蒸汽的燃煤消耗量，具有显著的经济效益。