超临界CFB锅炉主蒸汽压力控制系统研究

Research on Main Steam Pressure Control of Supercritical CFB Boilers

通过对超临界循环流化床(CFB)锅炉的动态特性、能量平衡、即燃碳量和主蒸汽压力调节进行分析,合理构建关键参数,并利用机理分析构造软测量模型,计算炉膛内即燃碳的存储量和蓄热量,从而得到当前锅炉的热量信号,将直接能量平衡控制思路应用于超临界CFB锅炉的主蒸汽压力控制系统.结果表明:该方法提高了主蒸汽压力的稳定性和负荷响应能力,改善了机组的调节品质,证明了所构建模型和所提方法的有效性.

By analyzing the dynamic characteristics, energy balance, burning carbon and main steam pressure control of supercritical circulating fluidized bed （CFB） boilers, a soft-sensing model was established based on mechanism analysis by reasonably setting relevant key parameters, so as to calculate the amount of burning carbon storage and heat storage in the furnace, and thus obtaining the heat signal in the boiler. The control strategy of energy balance was then applied in the main steam pressure control of a supercritical CFB boiler. Results show that the method can help to stabilize the main steam pressure, enhance the adaptability to load change and improve the control quality of the unit, proving both the model established and the method proposed to be effective.