Steam turbines

Classification of steam turbines for CHP
5
10
15
20
25
Live steam pressure, MPa
50
100
150
200
250
300
350
Power, megawatt
Class A1
Electric power
15 - 50 megawatt
Live steam pressure
2 - 4.5 MPa
Class
Power: 15-50 megawatt
Live steam pressure: 2-4.5MPa

Class А.1: single-casing turbines with straight steam flow arrangement for live steam pressure from 2.0 to 4.5 MPa (20-45 kgf/cm2), power ranged from 15 to 50 MW. Last stage blade with the length from 430 to 660 mm (17-26 in) can be used. Throttle control with an external valve unit or several units is used. The turbine is designed either with the radial exhaust to one water-cooled condenser, or with the axial exhaust to the air cooling condensing unit. The casing has a combined construction – the steam inlet part is cast, the middle part is welded and forged, and the exhaust part is welded. There is an option to organize steam bleedings both for a single-stage controlled heat extraction with a capacity from 50 to 100 Gcal/h and for industrial needs with a capacity of up to 40 t/h.

Characteristics

Values

Main type of the turbine

Cogeneration / condensing

Basic design feature

Single-casing with a straight steam flow

Steam distribution type

Throttle

Electricity output range, MW

15-50

Main steam characteristics:

- Pressure, MPa

2.0-4.5

- Temperature, °С

250-450

Capability of steam bleeding for heating:

- Scheme

Controlled steam bleeding; Single-stage delivery water heating

- Maximum heating load, Gcal/h

50-100

- Steam extraction flow rate, t/h

100-200

Capability of steam extraction for industrialuse:

- Flow rate, t/h:

up to 40 t/h

- Scheme

Non-controlled steam bleeding

- Guaranteed pressure, MPa

0.8-1.6

Characteristics of the main condenser

- Cooling water flow rate, m3/h

5,000-8,000

- Heat exchange surface area, m2

1,700-3,100

Turbines of this class

Т-42/50-2.9


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