超临界直流锅炉变工况实时运行中间点温度控制研究

Study of the Real Time Operation Intermediate Point Temperature Control of a Supercritical Once-through Boiler Under the Off-design Operating Conditions

以超临界直流锅炉为研究对象,分析了给水量和燃料量与锅炉中间点温度的关系,建立了中间点温度非线性离散模型,并进行控制系统设计,最后将该控制方法应用于某600 MW超临界直流机组,通过实际数据仿真结果和分析,证明了该控制系统在适应变工况运行的同时,能够实现中间点温度稳定的控制目的,能实时响应负荷变化,保证电力系统安全经济运行。

To set up a dynamic load response system for power generation equipment items is regarded as an effective method for enhancing the power source control efficiency.The output power of a thermal power generation unit depends on the feedwater and fuel quantity fed into its boilers.With a supercritical once through boiler serving as the object of study,the authors analyzed the relationship of the feedwater and fuel quantity with the intermediate point temperature of the boilers and on this basis,established a nonlinear discrete model for intermediate temperatures and de-signed a control system.Finally,the method above-mentioned was used in a 600 MW supercritical once-through unit.An analysis of the data actually measured proved that the control system can accomplish a stable control over the intermediate point temperature and real-time responded the change of the load at the same time of accommodating to the off-design operating conditions,thus,guaranteeing a safe and economic operation of the electric power system.