American Electric Power (AEP) Amos Power Plant, West Virginia, USA
Ignitor Upgrade for Supercritical Unit

Plant Description

The John E. Amos Power Plant in Winfield, West Virginia, is owned and operated by Appalachian Power, a subsidiary of American Electric Power (AEP). The nearly 3,000 MW of energy it generates is enough to power approximately two million homes.

The plant features three supercritical, dry-bottom boilers powered by a blend of low-sulfur coal and Northern Appalachian Basin high-sulfur coal. Unit 3 was started up in October 1973 as the first 1,300 MW power plant in the United States.

Project Challenge

When plant operators observed that the unit could not light off, they called upon Babcock & Wilcox (B&W) to help assess the condition of the ignition equipment and develop a plan to refurbish it to safe, reliable operation.

For the inspection, we pulled the internal guide tube assemblies from the unit and noted significant fly ash pluggage — up to 80 percent in some of the tubing. Several holes were also found in the tube assemblies and in the stationary guide tubes. In addition, some of the eddy plates were bent and not made or positioned to OEM specification; spark rod assemblies were in poor condition; and locking cams that fasten the atomizers and the unit’s oil and air connections were inoperable because of accumulated residue.

B&W was selected to inspect and refurbish ignition equipment at AEP’s Amos Plant.

Scope

  • Condition assessment of ignition equipment
  • Repair/refurbishment of 96 oil ignitors to OEM standards

Holes in ignitors’ stationary guide tubes prevented safe light-off of the unit.

Solution

As the exclusive provider of FPS® ignition equipment in the United States, B&W worked with AEP personnel to pull all 96 of the unit’s ignitors and refurbish them to OEM standards. This included:

  • Cleaning ignitor combustion air
  • Installing a duplex blower to prevent ash buildup for long-term reliability of the ignitors
  • Repairing or replacing all internal assemblies to specification
  • Removing, test firing and reconnecting spark systems
  • Resetting ignitor oil pressure to 10% of the burner input, and installing pressure and flow gauges to control and monitor settings
  • Supplying troubleshooting guides and training to plant personnel for ongoing maintenance support

Results

The amount of time to accomplish full light-off went from as much as 14 hours down to about 45 minutes. The plant reported an immediate cost savings with the first light-off, and “significant” savings annually since the refurbishment.

FPS Oil Ignitor

Use this quick guide to learn more about the vital parts of the FPS Oil Ignitor. Hover over the numbers. 

FPS Oil Ignitor


Combustion / Cooling Air Regulating ValveOil and air connectionsOil and Air ConnectionsSpark Rod ConnectionSpark Rod ConnectionOil Atomizer AssemblySeal Air ConnectionFlame Detection RodEddy PlatePAI Spark ProbeStationary Guide Tube

Combustion/Cooling Air Inlet

Supplies combustion/cooling air to the igniter

Eddy Plate

Provides proper mixing of the combustion air and fuel for
reliable ignition and flame stability

Flame Detection Rod 

Integral flame detection for igniter; high temperature
extension with removable flame rod

Oil and Air Connections

Positive shut-off quick disconnects allow easy maintenance,
while 1/4 in. oil and 3/8 in. air connections prevent
accidental switching

Oil Atomizer Assembly

SST construction, produces a finer spray, reduces particulate
and opacity emissions, minimizes atomizer plugging

PAI Spark Probe

High temperature extension with removable spark plug

Seal/Aspirating Air Connection (pressure-fired units only)

Seal air chamber allows removal of the spark and flame rods
and the oil atomizer

Spark and Flame Rod Connections

Flexible conduit connections allow removal of the flame and
spark rods without electrical disconnects

Stationary Guide Tube

Stationary guide tube with stainless steel end mounts easily
into the burner