N-90系统在大机组空预器密封间隙控制中的应用

Application of N-90 DCS at AH Sealed Interval Control for Large Unit

结合华能上安电厂1#机组（350 MW）空预器密封间隙系统技术改造，采用N-90分散控制系统对原系统方案、控制逻辑、信号放大器等进行了更新设计改造。运行结果表明，改造后系统信号稳定，线性调整范围增大，漏风量减小。

New design on plan, control logic and signal amplifier etc of 350MW unit AH sealed interval by using N-90 DCS is described. The results are proved signal stability, wide adjust range and reduced air leak rate.