某火电机组汽电双驱引风机系统辅机故障控制仿真及试验分析

Auxiliary Failure Control Simulation and Test Analysis of a Steam-electric Dual-drive Induced Draft Fan System for a Thermal Power Unit

为了研究某火电机组风烟系统采用汽电双驱型引风机系统,不同设备故障条件下机组相应的控制策略,依据热力学原理及设备固有属性,并搭建了相应的动力学模型,对发电机跳闸、小汽轮机跳闸、引风机与小汽轮机同时跳闸3种故障下的控制策略进行分析。最后,通过3次实际试验验证了控制策略及模型仿真结论的正确性。研究表明:在发电机跳闸时,可以通过调门快速动作到一定开度来保证机组的安全运行;在小汽轮机跳闸或引风机与小汽轮机同时跳闸时,可以通过保证机组的水煤比、风煤比等参数实现机组的减负荷运行。

In order to study the corresponding control strategy of unit under different equipment failure conditions when the smoke system of a thermal power unit adopted the steam-electric dual-drive induced draft fan system,according to the relevant thermodynamic principles and the inherent properties of the e-quipment,the corresponding dynamic models were built,and the control strategies under the three types of faults including generator trip,small turbine trip,induced draft fan and small turbine trip simultane-ously are analyzed.Finally,three practical tests verify the correctness of the control strategy and model simulation conclusion.The research results show that when the generator trips,the safe operation of the unit can be ensured by the quick action of the control valve to a certain opening;when the small steam turbine trips or the induced draft fan trips with the small steam turbine at the same time,the unit load re-duction operation can be realized by ensuring the unit water to coal ratio,air to coal ratio and other pa-rameters.