1000 MW二次再热火电机组主蒸汽温度控制策略及工程应用  

The Control Strategy of Main Steam Temperature for a 1 000-MW Double-Reheat Thermal Generation Unit and Its Application

作　　者：崔青汝 牛海明[2] 

机构地区：[1]中国国电集团公司,北京100034 [2]北京国电智深控制技术有限公司北京市电站自动化工程技术研究中心,北京102200

出　　处：《中国电力》2017年第6期27-31,共5页Electric Power

基　　金：国家科技支撑计划项目(2012BAA12B00)~~

摘　　要：以具有时变特性、大惯性和非线性的二次再热机组蒸汽温度受控对象为背景,结合超超临界直流锅炉特性,分析了过热器出口主蒸汽温度的变化机理,提出了基于改进型Smith预估补偿器实现的喷水减温控制系统。结合某1 000 MW超超临界二次再热塔式锅炉,给出了控制策略的设计要点。实践证明,该系统能有效解决超超临界二次再热机组主蒸汽温度控制的大延迟和大惯性问题,提高主蒸汽温度的动态控制品质,同时降低调试难度。Aiming at the main steam temperature control of double-reheat units with time variation, large inertia and non-linearity, taking the characteristics of uhra-supercritical once-through boilers in consideration, the mechanism of the main steam temperature changing at the superheater outlet is studied. Then, a water spraying desuperheating control system is proposed based on the improved Smith predictor. The control strategies of the control system are designed for a 1000-MW ultra-supercritical double-reheat tower-type boiler. The practical operation shows that the control system have effectively tackled the large delay and large inertia problems in the main steam temperature control of ultra-supercritical double-reheat units, improved the dynamic control qualities of the main steam temperature and at the same time alleviated the tuning difficulties.

关 键 词：燃煤发电 1 000MW 超超临界机组 二次再热循环 主蒸汽温度 SMITH预估补偿器 示范工程 

分 类 号：TM621[电气工程—电力系统及自动化] TP273[自动化与计算机技术—检测技术与自动化装置]