Adjustable stator blades

Figure 4-10. Compressor train for dual-pressure installation consisting of an axial flow air compressor with adjustable stator blades and a radial flow nitrous gas compressor and expander. Mass flow air = 139,000 Nm /h, nitrous gases = 122,500 Nm /h Pressure air = 0.82/4.75 bar, nitrous gases = 4.38/10.8 bar Power input total = 16,840 kW Power recovery by expander = 10,950 kW.

When used to eompress air, the axial eompressor may be equipped with adjustable stator blades, either partially (Figure 4-16) or on all stages. In the ease of a motor serving as the assoeiated driver or with a generator eoupled to the train, the adjustable stator blade feature allows more effieient eontrol than suetion throttling. With a steam turbine as the assoeiated driver, stator blade adjustment may be eombined with the obvious shaft speed eontrol. This eombination allows for speeial operating eonditions, sueh as startup, or extreme part-load operation. 

Figure 4-16. Axial compressor with adjustable stator blades, either partially or on all stages. Double-casing design and forged monoblock rotor. This design offers a wide operating range especially in combination with speed control.

Figure 6-11. Adjustable stator blade linkage. Courtesy of Elliott Company)...

Figure 12-100. Pressure-capacity characteristic comparison of an axial compressor with adjustable stator blades with a centrifugal compressor. (Reprinted with permission Lowell, W. O. Petroleum Refiner, V. 34, No. 1, 1955. Gulf Publishing Company. All rights reserved.)...

A well-designed stator blade adjusting meehanism is absolutely maintenanee-free, requires no lubrieation, and is eompletely proteeted against the ingress of dirt or moisture. 

Adjusting the stator blades leads to full are admission at all operating eonditions, and blade exeitations due to partial admission are thereby avoided. On well-designed hot gas expanders the adjusting meehanism is generally loeated between the blade earrier and outer... 

Integrated servomotor for adjustment of turbine stator blade Magnetic bearing Standstill bearing... 

Fig. I. One type of colloid mill. Rotor blades A break up slurry. Serrations in rotor and stator provide mechanical shear and force material into adjustable gap (0.0005-0.125 inch 0.013- 3 2 millimeters) between rotor and stator B for intense hydraulic shear. Lower pan of rotor C adds further whirling action...

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