Heat Rate Optimization

The objective of this videotape is to present the basic power plant cycle and discuss the energy conversions that take place throughout the cycle. The cycle and various efficiency considerations will be shown on two types of heat energy diagrams ? the Mollier diagram and the Temperature – Entropy diagram.

Upon completion of this videotape and the workbook exercises, the operator should be able to understand:

• The composition of a Mollier diagram and how the steam expansion through a turbine can be represented on it.
• Ideal steam expansion compared to actual steam expansion.
• Changing main steam conditions on the Mollier diagram and the effect on cycle efficiency.
• Using extraction steam for feedwater heating to increase cycle efficiency.
• How desuperheating spray water impacts efficiency.
• Basic properties of steam and water, and their reaction to heat.
• How the steam/water cycle can be represented on a Temperature – Entropy diagram.
• Changing main steam and exhaust conditions on the Temperature – Entropy diagram and the effect on cycle efficiency.
• The addition of a reheating section and feedwater heating to a Temperature – Entropy diagram and the effect on cycle efficiency.