PT-80/100-12.8

Contents

Contents

1. Initial data for calculation of turbine HPC:

2. Turbine Prototype Description

3. Preliminary evaluation of turbine economy and determination of steam flow rate in the first approximation

4. Determining Steam Flow to Regenerative Takeoffs

5. Determination of optimal pressure in the control stage chamber

6. Appearance of the first and last non-adjustable stages

7. Determination of turbine flow section and number of HPC stages

8. Determination of steam parameters before HPC stages. Steam parameter distribution graphs

Conclusion

List of used literature

1. Initial data for calculation of turbine HPC:

Turbine type PT80/10012.8

Turbine rated power Ne = 80 MW

Rated power of HPC turbine N = 40 MW

Pressure upstream the stop valve = 12.8 MPa

Steam temperature upstream stop valve to = 540 OS

Steam pressure downstream turbine HPC Pk = 1.40 MPa

Turbine rotor speed n = 50 c-1

Number of regenerative selections in HPC I = 2 pcs.

Number of stages in HPC 1 reg. + 16 reg.

Turbine Prototype Description

The turbine is a single-shaft two-cylinder unit. Flow part of HPC has single-stage control stage and 16 pressure stages.

The LPC flow part consists of three parts: the first (before the upper heating extraction) has a control stage and seven pressure stages, the second (between the heating extraction) has two pressure stages and the third has a control stage and two pressure stages.

High-pressure rotor is all-forged. The first ten discs of the low pressure rotor are forged together with the shaft, the remaining three discs are nozzle discs.

HPC and LPC rotors are rigidly connected to each other by means of flanges forged together with rotors. LPC rotors and generator of TVF1202 type are connected by means of rigid coupling.

Critical revolutions of turbine and generator shaft line per minute: 1,580; 2214; 2470; 4650 correspond to I, II, III and IV tones of transverse oscillations.

Turbine has nozzle steam distribution. Fresh steam is supplied to a separate steam box, in which an automatic gate is located, from where steam flows through bypass pipes to the turbine control valves.

Upon leaving the HPC, part of the steam goes to a controlled production extraction, the rest is sent to the LPC.

Heat extraction is performed from the respective LPC chambers. At the outlet of the last stages of LPC turbine, the spent steam enters the surface type condenser.

Turbine is equipped with steam labyrinth seals. Steam is supplied to the penultimate seal compartments at a pressure of 1.03 - 1.05 kgf/cm2abs. temperature of about 140 ° С from the collector supplied with steam from the deaerator compensating line (6 kgf/cm2abs) or the tank steam space.

Conclusion

The HPC of the turbine PT80/10012.8, having two adjustable steam extraction and intended for power generation, was calculated.

The turbine is designed for steam parameters: P0 = 12.8 MPa, t0 = 540 ° C, Pk = 1.40 MPa. Rated effective power Ne = 80 MW. Nominal flow rate 133 kg/s.

The calculation revealed that:

- steam flow taking into account Dot = 133 kg/s bleed;

-Internal cylinder efficiency equals ¼ i = 0.67;

-Mechanical Efficiency equal to ¼ m = 0.99;

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