Steam turbines

Classification of steam turbines for CHP
5
10
15
20
25
Давление свежего пара, МПа
50
100
150
200
250
300
350
Мощность, МВт

Class В.3: Three-casing turbines with the high-pressure, intermediate-pressure, and low-pressure casings. The high-pressure casing is made to be double-casing with an internal casing. Steam distribution can be both nozzle and throttle based on the assumed operating conditions. Steam is supplied into the cylinder center, the steam flow diagram in the high-pressure casing features reversed flow arrangement. Steam from the high-pressure casing can be supplied into both the intermediate-pressure casing and the cold resuperheating. The intermediate-pressure casinghas straight flow arrangement and has one turbine LP part section from which steam is supplied into the condenser. The other part of steam is directed from the intermediate-pressure casinginto the low-pressure casingwhich is made as double-flow symmetrical with two radial exhausts per condenser. The capacity range is from 200 MW to 350 MW, live steam pressure is from 12.8 to 23.5 MPa (130-240 kgf/cm2). The turbine features the possibility to organize single-stage or double-stage controlled heat extraction with a capacity from 120 to 370 Gcal/h, as well as control and uncontrolled industrial steam bleeding with a capacity of up to 250 t/h.

Characteristics

Values

Main type of the turbine

Cogeneration/ condensing

Basic design feature

Three-casing,

HPC with a reversed steam flow with the inner casing and steam delivery from the inner casing space to reheating, IPC with a straight steam flow and one exhaust of a low-pressure part,

LPC has double-flow casing

Steam distribution type

Throttle / nozzle

Electricity output range, MW

200-350

Main steam characteristics:

- Pressure, MPa

12.8-23.5

- Temperature, °С

540-570

Capability of steam reheating

Yes

Capability of steam bleeding for heating:

- Scheme

Controlled steam bleeding; Single-stage / two-stage delivery water heating

- Maximum heating load, Gcal/h

120-370

- Steam bleeding flow rate, t/h

230-710

Capability of steam bleeding for industrialuse:

- Flow rate, t/h:

up to 250 t/h

- Scheme

Non-controlled / controlled steam bleeding

- Guaranteed pressure, MPa

0.8-2.1

Characteristics of the main condenser

- Cooling water flow rate, m3/h

22,000-45,000

- Heat exchange surface area, m2

10,000-22,000

Turbines of this class

К-350-23,5 (project)


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