MAIN CHARACTERISTICS OF THE PRODUCTION UNIT 5
Unit 5 of the Thermal Power Plant Šoštanj has been transferred to the cold reserve in accordance with the Act on Transitional Financing of Accelerated and Fair Coal Phase-out (ZPFPPIP). This Act provides for the restructuring of the coal industry and the gradual abandonment of coal use in Slovenia. In Article 2 of the Act, “Unit 5” is defined as a 345 MW coal-fired unit, built in 1976 and renovated in 2018, which is connected to the district heating system via the thermal station 2.
| Units | Values | |
| Power (generator) | MW | 345 |
| Net output | MW | 305 |
| Own consumption | MW | 40 |
| Spec. use – guaranteed value (full capacity) | kJ/kWh | 11.500 |
| Fresh steam – flow rate | t/h | 1050 |
| Fresh steam – pressure/temperature | bar/°C | 183/540 |
| Reheated steam – pressure/temperature | bar/°C | 41.5/545 |
| Feed water temperature | °C | 257 |
| Unit’s operating power range – min/max | % | 42/100 |
| Load change | MW/min | 4 |
| BOILER | SULZER, vertical type | |
| Fresh steam flow rate | kg/s | 292 |
| Fresh steam pressure | bar | 183 |
| Fresh steam temperature | °C | 540 |
| Reheated steam pressure | bar | 41,5 |
| Reheated steam temperature | °C | 545 |
| Temperature of feed water to boiler | °C | 285 |
| Combustion (Lignite – Premogovnik Velenje) | PCC, tangential, NOx optimised burners | |
| Ignition fuel | fuel oil | |
| Coal mills – blower type mills | 6 | |
| Flue gas temperature at boiler outlet | °C | 160 |
| Flue gas cleaning | SCR catalyst, electrostatic precipitator, wet DeSOx process | |
| Flue gas discharge | with additional heating – to the smoke stack (h=230m) | |
| EMISSIONS: Limit values | ||
| SOx | mg/nm3 | < 200 |
| NOx | mg/nm3 | < 200 |
| CO | mg/nm3 | < 250 |
| Dust | mg/nm3 | < 10 |
| TURBINE | KWU – extraction condensing | |
| Nominal power | MW | 345 |
| Nominal rotations | min-1 | 3.000 |
| Nominal pressure | bar | 177,5 |
| Number of regenerative heaters | 7+1 | |
| Cooling system | natural draft cooling tower | |
| Cooling water preparation | decarbonisation, lamellar reactor | |
| GENERATOR | KWU | |
| Nominal power | MVA | 406 |
| Frequency | Hz | 50 |
| Nominal cos(φ) | cos φ | 0,85 |
| Nominal voltage | kV | 21 |
| Step-up transformer | RADE KONČAR 21/400 Kv 377 MVA | |
| Cogeneration of heat | Heat station 2 | |
| Installed capacity | MW | 145 |