Best FGD Practices under Flexible Operations

This technical update presents results from Electric Power Research Institute (EPRI) projects that focus on how to operate limestone forced oxidation wet flue gas desulfurization (FGD) systems in the current mode of operation; that is, where in addition to SO2 removal, the FGD systems are used to capture soluble trace metal species like mercury to help...

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Catalyst Minimum Operating Temperature Assessment Due to Ammonium Bisulfate Condensation: 2017 Laboratory and Full Scale Testing

The expanding use of alternative and renewable energy sources, along with the reduced cost of natural gas, is forcing an increasing number of large coal-fired power plants to operate at low load more frequently and for longer time intervals. Low-load operation poses special challenges for units that operate selective catalytic reduction (SCR) systems for nitrogen...

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Improving Unit Startups through Component Performance Improvements

Modern power plants are required to be increasingly flexible in their operation. They now cycle off and on line more which is harmful to plant availability, reliability, and efficiency. Power plants must also be successful in starting up as committed to meet the demands imposed by the market. The transient operation during start-ups and shutdowns...

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Part-Load Heat Rate Effects

Coal-fired power plant heat rate varies significantly between full and low load. For example, a typical 500 MW unit may experience a heat rate increase of 25% or more between typical full-load operation and minimum-load operation. Part-load operation has become more common and important for coal-fired units due to decreased natural gas prices and increased...

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