In power plants, electric actuators are widely used in the control of valves, dampers, flaps and other equipment in key process steps, and they directly affects the safety and efficiency of power plants. The following are the4 key stations in a power plant and their specific needs for electric actuators:

1. BoilerFeedwaterRegulatingValveStation

It is used tocontrol boiler feedwater flow and maintaining stable water level in the steam bag directly affect boiler safety and efficiency.We usually use regulating actuators with DCS system linkage control.

Requirements forActuators:

l Precision: high precision positioning (error≤0.5%), fast response speed (full travel time≤30 seconds).

l Reliability: more than 1,000,000 times of continuous stable operation.

l Redundancy design: support dual power supplyand signal redundancy, automatic switching in case of failure.

2. MainSteamIsolationValveStation

It is used foremergency shut-off of main steam piping to prevent turbine overspeed or piping rupture (e.g., in case of boiler MFT operation).We usually use switching actuators (full open/full close) requiring quick action.

Requirements forActuators:

l All-off time≤5 seconds (someothers require all-off time ≤2 seconds).

l Torque: High output torque (up to tens of thousands of Nm), high temperature resistant.

l Fail-safe: automatic shutdown on loss of power/ signal (spring return or accumulator actuated).

3. FlueGas DesulphurizationBaffleDoorStation

It is used to switch flue gas flow paths (e.g., bypass dampers), control the activation of desulfurization systems, and prevent corrosion and scaling. We use switching or regulating actuators, needed to be resistant to corrosive media.

Requirements forActuators:

l Corrosion protection: epoxy coating, sealing class IP68.

l Overload protection is provided to prevent the baffle from jamming and damaging the motor.

l Environmental adaptation: resistant to high temperatures and wet sulfide corrosion.

4.CirculatingWaterSystemButterflyValveStation

It is used to regulate or cut off circulating water flow affects condenser vacuum and unit efficiency. Large diameter valves (DN≥1000mm) need low torque design.

Requirements forActuators:

l Torque adaptation: opening and closing torque is adjustable to avoid water hammer effect.

l Waterproof: Submersible type actuator (e.g. IP68) is required for underwater installation.

l Easy maintenance: Supports non-intrusive commissioning (infrared remote control setting).