It is a small size large resource unit with easy and safe for perconnel operation.
Steam propeller turbine (PVM) unit capacity range 0,2-15,0 MW (at working medium (gas, water) inlet parameters: pressure 6-40 kgf/cm2; temperature 170-390ºC )
PVM is simple in operation, works smoothly, without noise and vibration, easily adjusted. The unit is not sensible to the condensate content in steam, has high efficiency.
VM assigned resource is 25 years. Overhaul life is 1500 hours (3 years)
Some propeller turbine advantages in comparison to usual turbine
- Can be operated on steam of any quality (high humidity, solid particle presence are allowed)
- Construction compactness and simplicity, easy maintenance
- High repairability
- Service by ordinary personnel, easy training
- Operation on steam from ordinary boilers DE, DKVR, etc (pressure 6-40 kg/cm2)
- Operation reliability and safety – flexibility, quick start and stop
- High power regulation range (10-100%)
- Torque uniformity at output shaft rotations
- Lower cost including erection and checkout
History of development
Steam engine project was started at early 90s in National Aviation Motor-building Institute (TsIAM, Moscow) by group of scientists under the leadership of Doctor of Engineering Science, Professor Berezin S.
PVM structure description
Steam propeller turbine presents reciprocal screw compressor. It contains drive and secondary rotor in screw form. Drive rotor output shaft is connected to the electric generator. Rotors are in gearing and have connection gear-wheels, excluding the possibility of mutual contact during the operation
On Customer request steam intake with intermediate pressure can be foreseen. Seals are face, double. Depending on operation conditions VM can be complete with sliding or hydrostatic bearing.
Oil system: main oil pump, driven from VM shaft and start-up pump, driven from electric engine. Turbine oil Tp-225. Oil pressure in system after the pump is 6 atm. Cooling is performed by tap water and/or air radiator
Electronic power system: generator may be asynchronous or synchronous depending on the set use. Generator voltage output depends on VM power and Customer circuit voltage, and is 0,4 kV, 1 kV, 3kV, 6 kV, 10kV. While working with asynchronous generator the capacitor bank is necessary as a reactive energy source.
Automatic control and regulatory system: Automatic control system VM takes into account various boiler levels of instrumentware (power departments) and can be operated together with microprocessor-based industrial control as well as opportunity to work independently in boiler houses with legacy instrumentation.
Operation description
Through the piping on the body steam comes to inlet windows on one face of the body. Going through screw-shaped channel between the screws teeth, steam is expanded and transfer thermal energy into mechanical, smoothly rotating the rotors. Rotary moment is passed through the coupling on the reducer shaft. Waste steam is removed through outlet windows and piping, and having considerable heat content produce extra work. It comes into technological cycle or water heaters for hot water supply and heating
Supply completeness (including block design)
- Steam power plant with asynchronous or synchronous generator
- Gas power plant with asynchronous generator
- Turbo drive (steam or gas plant with mechanical drive)
Propeller turbine connection schematic circuit
Working medium – steam or water (temperature less than 250ºC; pressure less than 2,5MPa)
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1. Reduction and cooling unit
