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循环流化床 ( CFB)燃烧是一项高效、低污染的技术。建立了 CFB锅炉的动态数学模型。模型沿气体和固体的主要流动方向将流化床系统划分成连续的一系列小室 ,在每一小室内对各物质建立质量和能量的非稳态方程。同时 ,模型考虑了气固两相流动、煤颗粒燃烧、SOx、NOx 的生成与还原反应及受热面上的热传递。对一台 3 5 t/h CFB锅炉进行了动态仿真计算。计算结果表明 :该模型可以准确反映所仿真锅炉的动态特性。该模型可以预测锅炉特性 ,为设计和运行提供指导 ;可用于开发模拟培训仿真器 ;还可以为控制策略的选择和控制系统的设计提供指导
Circulating fluidized bed (CFB) combustion is an efficient and low-pollution technology. The dynamic mathematical model of CFB boiler is established. The model divides the fluidized bed system into a series of continuous chambers along the main gas and solid flow direction, establishing an unsteady equation of mass and energy for each material in each chamber. At the same time, the model considers the gas-solid two-phase flow, coal particle combustion, SOx, NOx formation and reduction reactions and heat transfer on the heated surface. Dynamic simulation of a 35 t / h CFB boiler was carried out. The calculation results show that the model can accurately reflect the dynamic characteristics of the simulated boiler. The model can predict boiler characteristics, provide guidance for design and operation, can be used to develop simulation training simulators, and can provide guidance for control strategy selection and control system design