Abstract
Gas turbine degradation significantly impacts the operation, maintenance, and lifecycle cost of gas turbines. Multiple components within the gas turbine contribute to the overall degradation of gas turbine-based combined cycles, with the compressor component being the primary contributor. The compressor degradation is predominantly influenced by the quality of the intake air. Airborne particles tend to deposit on the compressor blades and vanes, increase surface roughness and potentially alter the blade shape, which can result in additional aero losses.
Nowadays, customers are seeking gas turbines that exhibit less degradation, increased reliability, and greater availability. To meet these demands, many Original Equipment Manufacturers (OEMs) are focusing on improving the quality of intake air through the incorporation of highly efficient filters. Such filters reduce the deposition of air particles on the compressor blades, which leads to improved long-term compressor performance, increased gas turbine parts life, and reduced water wash cycles, thereby improving availability. However, the high cost of these filters and the increased compressor inlet pressure drop can reduce the overall performance of the Gas Turbine-based Combined Cycle (GTCC). Thus, it is essential to consider the impact on the overall lifecycle cost when selecting an appropriate filter class, which can guide the customer in making an informed decision.
The first section of this paper discusses various classes of filters, their efficiency, and the resulting pressure drop. It also examines the degradation of Gas Turbine-based Combined Cycle (GTCC) associated with different air intake filters. The second section of the paper conducts a life cycle cost analysis of different filters using Siemens Energy’s in-house cost analysis tool called the Power Value (PV) tool. Although currently exclusive to Siemens Energy, the tool will be available to third-party users in the future. The analysis includes Levelized Cost of Electricity (LCOE), calculations for a 25-year period of GTCC plant operation. The analysis takes into account appropriate capital, fuel, maintenance, and electricity costs.
This life cycle cost analysis provides valuable benefits to both customers and OEMs by comparing different air intake filter options and quantifying the total cost of each option, including capital, operational, and maintenance costs. This analysis enables customers and OEMs to identify the most cost-effective solutions during the project proposal and bidding phase. Additionally, this paper offers guidance on selecting suitable filters for various environments and highlights the impact of highly efficient filters on the decarbonization.
