600MW机组汽动引风机系统控制策略优化与仿真

Optimization and Simulation of the Control Strategies for a 600 MW Unit Steam-turbine-driven Forced Draft Fan System

针对600 MW火电机组汽动引风机低负荷运行时的安全问题,对其控制策略进行了分析,提出了静叶和转速协调控制炉膛负压以及静叶开度随负荷梯级变化的优化控制策略;建立了基于APROS(核电厂和普通电厂仿真)软件的汽动引风机仿真平台,能够准确模拟实际运行过程中引风机各项参数的变化;利用APROS仿真平台对改进后的控制策略进行仿真模拟,结果表明:优化后的控制策略能有效避免引风机的喘振问题,提升机组运行的安全性。

In the light of the safety problems encountered when a 600 MW thermal power plant unit steam-turbine-driven forced draft fan was operating at a low load,the authors analyzed its control strategies and proposed optimized control strategies for coordinating and controlling the negative pressure in the furnace by changing the rotating speed of the stator blades and making the installation angle of the stator blades to change step by step with the load. On this basis,a simulation platform for steam-turbine-driven forced draft fans was set up based on the APROS software,being capable of accurately simulating changes of various parameters of a forced draft fan in its practical operation process and a simulation was performed of the control strategies optimized by using the APROS simulation platform.It has been found that the optimized control strategies can effectively avoid the surge problem of the forced draft fan and enhance the operation safety of the unit.