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 the 4 key stations in a power plant and their specific needs for electric actuators:

1. Boiler Feedwater Regulating Valve Station

It is used to control 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 for Actuators:

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 supply and signal redundancy, automatic switching in case of failure.

2. Main Steam Isolation Valve Station

It is used for emergency 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 for Actuators:

l All-off time ≤ 5 seconds (some others 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. Flue Gas Desulphurization Baffle Door Station

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 for Actuators:

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.Circulating Water System Butterfly Valve Station

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 for Actuators:

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).