基于磨出口温度定值优化的制粉系统多变量预测控制

摘要

To reduce the latent heat of vaporization and the ignition heat required for pulverized coal combustion,and to improve the stability and economy of the boiler combustion within a wide load range,a multivariable predictive control scheme was designed for the pulverizing system based on outlet temperature optimization of the coal mill,which considers both the safety of milling equipment and the optimization of mill outlet temperature for energy saving purposes.Simulation results show that the multivariable predictive control scheme improves the outlet temperature of coal mill and reduces the coal powder moisture under the premise of safe operation of the milling equipment,better ensuring the safe,stable and economical operation of the coal-fired power unit.%为了降低入炉煤粉燃烧所需的汽化潜热和着火热,提高锅炉宽负荷燃烧的稳定性和经济性,在考虑制粉系统设备安全和磨煤机出口温度(简称磨出口温度)节能最优的基础上,设计了基于磨出口温度定值优化的制粉系统多变量预测控制方案.结果表明:基于磨出口温度定值优化的多变量预测控制方案能够在确保制粉系统设备安全的前提下提高磨出口温度,降低入炉煤粉水分质量分数,更好地保证燃煤机组的安全稳定经济运行.