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the gas turbine air intake downstream of the air filter together with a droplet separator. The latter is needed to take out water droplets from condensation of humid air. Evaporative coolers: Generally, they are installed in the gas turbine air intake downstream of the air filter together with a droplet separator (see Figure 56). The evaporative cooler increases humidity close to saturation. The amount of evaporated water depends on ambient temperature and humidity. The water evaporates mostly before entering the compressor and the air is cooled down before compressor inlet. Thus, the air mass flow through the gas turbine is increased, which increases the power output of the unit. The evaporative cooler is only switched on and off. The cooler media and the droplet separator produce a pressure drop between 1.5 to 3 mbar and need an axial extension of the filter-house (see Figure 57a). The major components of an evaporative cooler are: • the evaporative cooler media (cellulose or fiber-glass, see Fig. 57b) • a water distribution manifold • a water sump tank with a recycle pump • a droplet separator (see Fig. 57c) Water requirements The water must be at least potable or flocculated and filtrated water quality or can be de-mineralized water. The water consumption is higher if tap water is used. Maximum total capacity is 25,000 l/h for a GT26 or GT13 and 17,000 l/h for a GT24 or GT11, where only 1 1,000 l/h and 7,500 l/h are evaporated and the remaining blow-down water is re-circulated. Fig. 57. a) Evaporative Cooler Location, b) Evaporative Cooler, c) Droplet Separator 7 Inlet fogging Like evaporative coolers, this OEM’s fogging systems ALFog (an Alstom trademark) are typically installed in the gas turbine air intake downstream of the air filter (Fig.58). Fig. 58. Fogging System Arrangement 7 The fogging system injects small water droplets into the air by nozzles to increase humidity close to saturation (90-95%). The amount of injected water depends on ambient temperature and humidity and is controlled by logic. The water evaporates and the air is cooled down before entering the compressor. In contrast to evaporative coolers, fogging systems have negligible pressure losses and do not need an axial extension of the filter house and are therefore ideal for retrofitting. 49PDF Image | GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS
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