New design on plan, control logic and signal amplifier etc of 350MW unit AH sealed interval by using N-90 DCS is described.

• 结合华能上安电厂1%23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。