STEAM TURBINE Vendor Breakout Presentations ARNOLD Group

Advanced single-layer turbine warming system

Pierre Ansmann and Norm Gagnon covered the basics of steam-turbine warming for increased startup flexibility in their breakout presentation, which began by answering the question, “Why install a turbine warming system?” Highlights of their PowerPoint, available on the Power Users website, include the following:

  • Maintenance and operational benefits.
  • Differences in warming-system arrangements.
  • System durability and reliability.
  • Importance of proper insulation for a warming system.
  • Cost and schedule of the initial installation.
  • Periodic maintenance plan.

In their review of alternative warming-system arrangements, the duo rejected those integrating heating circuits in insulation blankets, installing the heater on a thin mattress below the blanket, and using glass-fiber-insulated heating cable. The optimal system for the upper casing, they said, is a heater on a metal-mesh baffle; for the lower casing, permanent mounting of heating cable below the split line.

Ansmann and Gagnon explained that the ARNOLD system features interlocking high- performance blankets which conform perfectly to the turbine surface (Fig 1). High-quality materials and manufacturing, and long-term high-temperature resistance, allow the company to guarantee reuse of its insulation system for 15 outages without a decrease in efficiency.

high-performance-blankets-which-conform-perfectly-to-the-turbine-surface

More than five-dozen thermocouples, strategically located on the turbine, ensure proper heating. Each of the 18 or so heating zones has t/cs installed on the heating wires to double check if the zone is responding correctly and at the specified temperature. Below every heating zone, multiple t/cs are mounted on the casing to confirm even heating of the turbine.

The speakers said the ARNOLD warming system can maintain your turbine in a hot-start condition for at least four or five days after shutdown. No preheating of the turbine is required prior to a restart within this time period, reducing startup fuel consumption and auxiliary power.

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