The Tusimice Power Stations

The onset of electricity production in the Tusimice location goes back to years 1963-1964, when Power Plant Tusimice I was put into operation. Its successor, Power Plant II, with four 200 MW units, was put into operation in the period of 1973-1974.

Similarly as ETU I, decommissioned already, Power Plant Tusimice II was constructed directly at its coal fuel source - Nastup Tusimice Mines. The power plant location in the very center of a brown coal deposit, with belt conveyor transport from mining sources to the power plant itself, has always been the main advantage of the Tusimice location, when coal railway transportation costs are entirely eliminated. Thus, production costs are drastically reduced, making the power plant one of the most efficient operations within the Czech Republic. Therefore, the power plant has always been utilized up to its maximum capacity, since the beginning of its operation start-up.

Burnt coal average quality parameters (as of 2003)
Coal calorific value	11 269 MJ/kg
Coal ash contents	21,64 %
Dry mass ash contents	32,71 %
Water contents	33,85 %
Sulphur contents	1,62 %

Steam boilers of 660 t/h unit output were manufactured by Vitkovice Company. They are of once-through, double-pass design, with granulating furnace and steam overheating. Each boiler has 6 fan mills. At present, natural gas is used for boiler start-up, replacing initially used boiler oil. Each boiler is equipped with a turbofeeder and a pair of backup power supply units.

During the current operation, boilers were subjected to a number of modifications and reconstructions aiming to reduce slag volumes, as the priority, and later comply with emission limits applicable to NO_x, CO  and SO_2.

Turbines, manufactured by Skoda Company, are of condensing, active, three-stage design, with eight unregulated off-takes for utility water heating and hot water heat supply. They provide 200 MW nominal power output, with 3000/min nominal revolutions and 16.5 MPa, 540/540 °C steam parameters.

There is a circulation cooling system, with 96 m re-enforced concrete cooling tower belonging to each unit. The water source is arranged in Ohre river.

Skoda generators of 235 MVA power output and 15.75 kV voltage utilize a combine cooling system - surface hydrogen cooling, with stator winding cooled by condensate flowing through hollow conductors.

The plant electrical power output leads through 240 MVA/15.75/400 kV unit transformers in a pair of transmission lines to Hradec switch plant.

Apart from electricity production, the power plant is an important heat power supplier, particularly for the town of Kadan, Nastup Tusimice Mines, and other small consumers.

Units are controlled from two unit control rooms. The initial, and obsolete, unit control system was replaced in the period of 1994-1997 for PROCONTROL P state-of-the-art control system produced by ABB company.

Additionally, coal handling control system was replaced and the water chemical treatment control system was totally modernized, with VALMET control system installed on both instances.

The desulphurization equipment constructed in 1994-1997 by Chiyoda company operates on the wet limestone washing principle. In contrast to conventional shower desulphurization units, a bubble-jet reactor by Chiyoda Japanese company is implemented, ensuring perfect contact of combustion products with absorption suspension and consequently a higher degree of process efficiency, with lower energy demands. Power plant gypsum resulting from the process goes to three drying lines consisting of hydrocyclones and vacuum filters, where dehydration takes place. Then, the gypsum goes on belt conveyors to a storage site or directly to a mix station of ash dry transportation.

A gradual introduction of desulphurization equipment was related to changes in waste deposit process. An initial hydraulic ash removal process was replaced by an ash dry removal, with ash transported pneumatically into storage silos and then, together with the power plant gypsum from the desulphurization process, on belt conveyors into the Nastup Tusimice Mine area, where the mixture, certified as deposit material, is utilized in landscape recultivation necessary after mining activities.

The PP Tusimice organization unit includes, in addition, the small Zelina hydropower plant. The hydropower plant was operated in the period of 1908-1925, and reintroduced into operation in the year 1994. Currently, it supplies about 300-450 kW of electricity, depending on the water flow rate. The Zelina hydropower plant is a remarkable structure due to its architecture design and historical technology employed.

Production unit - Tusimice II
Installed power output	4 x 200 MW
Operation commenced in the year	1974 - 1975
Desulphurized since the year	1997