In the turbine section, work is extracted from the high-pressure, high-temperature working fluid as it expands to atmospheric pressure. Thus, hot gas energy is converted into mechanical energy to drive both the air compressor and the load. Figure 10-23 shows a gas duct, which transfers the hot gases from the flame tubes to the inlet of the high-pressure turbine.

Applied turbine section designs include radial inflow and reaction configurations. Some small-capacity units may feature the radial inflow design, but most units use multistage reaction turbines. In multi-shaft (free turbine) configurations, turbines dedicated to driving compressors are referred to as compressor drive turbines or gas producer turbines. Turbines dedicated to driving external loads such as generators, pumps, or process compressors are referred to as

Fig. 10-23 Single-Piece Super-Alloy Gas Duct Used to Transfer Hot Gas to High-Pressure Turbine. Source: MAN GHH

free turbines or power turbines.

Figure 10-24 shows a power turbine module. The gas generator can be seen in the background. Figure 10-25 shows a high-pressure turbine, featuring two axial-flow stages, that is used to drive the compressor of an industrial gas turbine. Figure 10-26 illustrates the turbine section design for a large-capacity, heavy-duty industrial turbine. Figure 10-27 shows the turbine section of a heavy-duty gas turbine. Figure 10-28 details the vanes and blades of a high-pressure turbine. Figure 10-29 shows a turbine rotor with four-stage blading for a large-capacity gas turbine. The turbine blading has been designed to minimize any turbulent boundary zone and to provide a low entry velocity at the leading edge pressure side of the blades with continuous increase of the flow acceleration.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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