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给出了再热器动态特性的简便计算公式.依据再热器的结构参数和热力参数,计算分析了摆动火嘴、烟气挡板、烟气再循环等调温方式下和喷水扰动下的再热汽温动态特性,并提出在主要调节方式无法投入自动状态时,采用一级再热器喷水减温的2种大滞后再热汽温辅助调节系统:二阶超前/滞后单回路控制系统和经典的单回路控制系统.对经典的单回路控制系统,将调节器的微分时间常数Td和积分时间常数Ti之比提高到0.6~0.8,可克服一级喷水减温再热汽温的大滞后,使控制系统稳定工作,从而满足再热器的运行需要.
A simple calculation formula for the dynamic characteristics of the reheater is given.According to the structural parameters and thermal parameters of the reheater, the influence of temperature fluctuation, such as swinging nozzle, flue gas damper, flue gas recirculation, , And proposes two kinds of large hysteresis reheat steam temperature auxiliary adjustment system adopting primary reheater to reduce water temperature when the main regulation mode can not be put into automatic state: the second-order lead / lag single-loop Control system and classical single-loop control system.For the classical single-loop control system, the ratio of the differential time constant Td and the integral time constant Ti of the regulator is raised to 0.6 ~ 0.8, which can overcome the disadvantages of the first- Large temperature delay, the control system to work stably, so as to meet the reheater operation needs.