Process Control Valves... 

Reliant Energy - Windbox Dampers

Application

Actuators for damper control to in Cheswick power generation plant.

Customer

Reliant Energy was established in 2000 and is a subsidiary of NRG Energy. Cheswick Power Station is a coal-fired power station near Springdale, Pennsylvania.

The Challenge

Exlar received a $156,000 order from Reliant Energy for their Cheswick Station power generation plant, located just outside of Pittsburgh, PA. The order included a total of 44 GSM30 actuators and 44 SV positioners. This order is the second of two large orders from Reliant Energy and will allow them to complete the retrofit of all 88 windbox dampers using Exlar actuators and SV positioners.

The Solution

This application uses a GSM30 actuator and SV positioner to control the position of windbox dampers located on the furnace. To provide tight control of windbox airflow, it is imperative that damper blades respond to demand signal changes as small as .25% full scale. Utilising a clevis mount, Exlar's linear actuators allow the operator to manipulate each separate damper blade, centring the fireball in the furnace for maximum efficiency.

Windbox Dampers1

High Acceleration

Reduced Maintenance

Reduced Total Ownership Costs

Energy Efficiency

Results

Reliant Energy noticed a significant decrease in maintenance costs after the first half of the windbox damper actuators were installed with Exlar, and is looking forward to the same result when the remaining actuators are replaced. This application is an excellent example to demonstrate how Exlar actuators can be used in the power generation industry.

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