Gas Turbines: HEPA Filtration

Why Use HEPA Grade Filtration for Gas Turbines

HEPA (High Efficiency Particulate Arrestance) filters are becoming the first choice for increasing number of gas turbines operators. With the evolution of turbine technology and increasing demand for higher turbine efficiency and sensitivity, it is even more vital now to maintain blade integrity. Gas turbine operators need all air entering the gas turbine to be as clean as possible to ensure the highest performance. Hence, in view of high efficiency and reliability needs, HEPA filters are great alternatives to be used in gas turbines.

One reason behind the use of HEPA in gas turbines lies in its ability to assist with high turbine efficiency. Incorporation of HEPA grade filters results in higher fuel efficiency, constant high power output and also there is no need for compressor washings, which cuts maintenance cost and shut down time.

Another reason is higher reliability. Fouling is one reason behind negatively elevated temperature of the engine, which also affects the internal components’ durability and functioning. Clean air ensures maintenance of important turbine parts to the fullest levels, thereby reducing the possibility of compressor fouling, blocked cooling passages, blade erosion and hot gas corrosion. These parts include air compressors, variable stator vanes, stator blades and labyrinths.

In addition, the integration of HEPA (E10, E11, E12) grade filters with suitable pre-filtration stages also handles salt particles, protecting gas turbines from corrosion and thus reduces the risk of sudden or unplanned shutdowns.