Multiple shafts

The calculation of the turbine expander module depends whether or not this is a single shaft gas turbine or a multiple shaft gas turbine. In aero-derivative turbines, there are usually two or more shafts. In the latest aero-derivative turbines, there are usually two compressor sections, the LP compressor section, and the HP compressor section. This means that the turbine has three shafts the third shaft is the power shaft. The turbines that drive the compressor section are known as the gasifier turbines, and the turbine, which drives the generator, is the power turbine. The gasifier turbine produces the work to drive the compressor. 

The first and the primary claims are extremely telling Double-or multiple-shaft corotating extruders in single or multiple-flighted versions with the sealing profile, i.e., defined with the flank profiles in cross-section by circles with radius equal to the centerline distance (see Section 2.2.1). 

Figure 2.8 Multiple shaft co-rotating extruder system with full intermeshing and mutual cleaning of the shafts. There is a continuous connection between A, B, C, and D etc. The possible material movements in principle are as follows ...

Multiple shaft extruders. Some publications quote a classification for multiple shaft extruders referring to combined de-airing extrusion units defined by the sum of their auger shafts, infeed shafts and mixer shafts. This method of categorization is, however, disputed. 

In designing closed helium cycles, a major cost driver is the volume of ducting required to transfer helium between equipment, because it affects the cost of the pressure boundary. It is doubtful that one will be able to identify a more compact configuration for the MCGC than this multiple-shaft design with annular rings of heaters around each turbine, because all flows enter at the optimal elevation in the vessels, and the hot gas flow path is extremely short. 

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