2000 kW 348 PSI Atlas Dual Turbine

Description

Used Atlas model C-700TE dual turbine. New in 1986. Maintenance carried out in 2008.
The turbine and gearbox are connected via a coupling to the generator, which is mounted on a steel frame along with the turbine. It is a single-stage steam turbine with an integrated gearbox. The turbine stage is attached to the gearbox with one high-speed pinion, on which the turbine impeller with two-stage axial blading type C is mounted. The cabinet is fixed on the transmission. Bearing lubrication gear is protected by the oil system of the generator.

**Nominal parameters of the Atlas C-700 TE turbine**
Required steam quality according to CSN 07 7401
Allowable increase in pressure and temperature on a quick valve according to EN 60045-1

Rated steam parameters:*
- Input: 2.4 MPa ABS, 350 °C
- Output: 0.25 MPa ABS, 210 °C
- RPM: 6000/3000 min⁻¹
- Steam consumption/performance
- Steam flow: 30 t/h
- Rated power: 2000 kW

**Generator**
- Rated voltage: 3 kV x 6300
- Electrical performance: 2500 kW at the generator terminals

**Regulation**
Turbine operation is controlled by an electronic regulator TR 101 and an electro-hydraulic oil low-pressure unit by Voith.
The control of the regulatory quick-closing valve is operated by the oil pressure unit.

Turbine regulation allows the following modes of operation:
- Speed control maintains the desired speed during turbine start-up, before connecting the generator to the electrical network, and during controlled shutdown after disconnecting the generator.
- Backpressure regulation operates only when the generator sets are connected to the electrical network. The turbine steam flow is determined by the immediate demand for steam appliances and the electric power corresponds to this flow (i.e., the electrical power produced should be used). Pressure regulators maintain a constant (adjustable) backpressure.

**Oil management**
Oil management for lubrication of bearings and transmission gearwheels:
- Main gear-driven oil pump supplies pressurised oil for lubrication of the turbine during operation (gear). Auxiliary electric oil pump.
- Emergency oil pump driven by an electric motor supplies pressure oil for lubrication and cooling of bearings in the event of a full power failure (power supplied from an independent source such as a UPS).

The oil tank has a volume of approximately 400 litres. For lubrication, turbine oil TB-46 or an equivalent compliant with IEC 656620 can be used.
- Oil cooler (2 x plate L25 GG 60) using aggressive cooling water. Maximum water flow at 20 °C is approximately 8.4 + 5.2 t/h. The cooler pressure drop is about 35 kPa with water warmed by 8 °C. Required cooling water pressure is 0.6 MPa.

Chemically treated water is recommended for cooling with the following specifications:
- Mechanical particles: maximum 50 mg/l
- pH: 7 to 8.3
- Hardness: 4 to 7 mg eq.
- Impurities content: 700 to 1000 mg/l
It is recommended to install a coke filter in the water circuit.

- Two oil filters, each containing 6 x inserts CFO 11942 with 25 micron rating.