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High
Efficiency, High Volume Applications
Axial flow compressors are designed for high volume, high efficiency and high reliability applications. These applications include air separation,
 sewage treatment, wind tunnels and CAES. Two of our primary
applications are FCC air blowers and blast furnaces.
The Dresser-Rand axial-flow compressor line includes six standard frame sizes each available with from 3 to 15 stages. Pressure ratio is determined by the number of stages and flow is varied by changing the length of the blades.
We Design for Performance and Convenience
The Dresser-Rand axial compressors are a very reliable relatively simple machine. The design provides excellent accessibility by being
horizontally split and providing the variable stator adjusting mechanism outside the casing. Rotor blade replacement can be done individually without removing the rotor from its’ casing.
Axial Compressor Cross-Section.
Intake and discharge volutes are either fabricated or cast steel and can be arranged upward or downward. The intake volute has flow taps
to provide calibrated flow measurement.
Stator casing located in the compressor center section between the intake and discharge volutes is a two piece design manufactured from cast steel.
Stator vanes are available in three arrangements, fixed, individually adjustable or
continuously adjustable.
Fixed blading is normally used with variable speed applications.
Individually adjustable blades provide for future changes in operating characteristics or where
occasional blade
adjustment is desired.
Continuously variable blades with automatic control are usually supplied on constant speed applications with frequent changes or fluctuations in
operating conditions.
With continuously variable stators all blades are adjusted simultaneously by a drive ring which is linked to a drive shaft that is automatically adjusted by a electro/hydraulic actuator from a 4-20 ma signal.
Rotor construction can be either disc-on-shaft or tie bolt depending on the number of stages. Rotor blades are a chrome stainless steel that do not require coatings. The inner end is formed into a dovetail section which fits into a mating slot in the rotor disc. Blades are held in place axially by
removable clips and can be easily replaced in the field if necessary, without removing the rotor.
Bearing housings are horizontally split for easy access to all bearing parts without the need for disassembly of the volutes or casing. The bearing housing brackets are bolted and doweled to the casing for positive and permanent alignment.
Bearings, journal and thrust can be one of many choices from the traditional sleeve journal to various tilt pad designs and the original design self equalizing thrust to various self leveling, self equalizing , flooded lube or directed lube designs. Our experience with the may alternatives in existing and new units can provide you with many alternatives.
Focused on Performance Improvements
Axial compressor design and there associated components are always being reviewed for improvement. Performance increases in existing units can be
provided to maximize flow and efficiency. Incremental options usually exist for
potential revamping or rerating an existing axial compressor. Upgrades or improvements to various components include reinforced variable stator drive rings, replacement of the
pneumatic
/hydraulic actuator system with a self contained electro/hydraulic actuator,
variable stator inner hardware and spring links and rotor blade material which does not require coating as well as
new blade designs for added performance.
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