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Combustion Turbine High Flow Lockout DFT Check Valve Success
Location: TVA Kemper Station – N. Mississippi
Application: The DFT model GLC Check Valve shown is installed on GE Energy Model# 7EA Low NOx Dual Fuel Turbines. When the turbine run on diesel fuel water is injected with the diesel fuel to lower the emissions and increase power. There is a 3” 600# water injection line running to each turbine. At the turbine the line is split into 20 – ¾” lines that are spaced equally around the turbine.
General: The GE turbines can run on natural gas or diesel fuel. TVA must get permission from the local gas company to run its turbines on natural gas. Any disruption of natural gas would rely on the diesel back up. This is because the turbines consume so much natural gas that the gas company must make sure that its compressor station in the area is running at max capacity. If not, downstream customers may be negatively affected.
Problem: HIGH FLOW LOCKOUT - When one of the 20 – ¾” (JASC, Parker or Lee) check valves fails it allows air to back up to the isolation valve causing a failure mode on that turbine. Also when one of the 20 - ¾” check valves fails the operator does not know which valve failed. All 20 must be taken out of service and inspected. TVA wants to remote start the turbine for Chattanooga, TN in 15 minutes from a cold start. Diesel fuel is the only option for this quick start.
Solution: TVA has installed the 3” 600# 316SS/316SS GLC with sizing, soft seat and special spring on the water injection line near the turbine. This has eliminated the back up of air to the isolation valve. The turbines are working properly on diesel fuel or natural gas. This retrofit has been in service for one year without any failure of the diesel fuel system.
Note: Single fuel turbines with water injection systems have the same problem.
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Contact:
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GE Energy Model# 7EA Low NOx Dual Fuel Turbine
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Install the DFT 3” ANSI 600# 316SS/316SS GLC with sizing, soft seat and special spring on the water injection line near the turbine in the box located in this area approximately.
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