The Tusimice Power Stations
New: Virtual tour! The beginning of electricity production in the Tušimice location dates back to 1963-1964 when Tušimice Power Plant I started its operation with six 110 MW units.
It was operated at the fully installed output till the beginning of the 1990’s when all 6 units were shut down under the attenuation program. The project of elimination of all obsolete objects and pieces of technological equipment will clear the location equipped with any and all infrastructure and will prepare it for further industrial use. The power station stack fell to the ground in November 2005; it was the tallest reinforced-concrete stack (196 meters) in the Czech Republic that was blasted in this way.
Tušimice Power Plant II with four 200 MW units started its operation in 1974-1975. It was built identically with the first one, directly by the fuel resource - Nástup Tušimice Mines, from where the fuel is brought on a conveyer as far as to the boiler house. The power plant also supplies heat to customers in vicinity, supplying the heat to the City of Kadaň. The total annual heat supply to the customers amounts to approximately 750 heat units at the maximum heat output of 85 MWt. The installed output for the heat supply is 120 MWt.
In the period from 2007 to 2012, Tušimice Power Plant II underwent a grandiose complex restoration that will ensure its future operation in line with the current European standards roughly till 2035 when the adjacent Libouš mine is expected to be exhausted. The power plant’s efficiency increased by 6%, which saves 14% of fuel per MWh produced. The upgraded technology will also enable burning of lower quality fuel from the Libouš mine in the future. The desulfurization equipment built in 1994-1997 has been upgraded. Now it is ready to meet the strictest emission limits after 2016.They managed to reduce the nitrogen oxide emissions by 70%, sulfur dioxide emissions by 79% and emission of solid pollutants by 87% (the power station underwent the first ecologization in the 1990’s when its emissions were reduced by more than 90% in the first stage!). The secondary energy products (fly-ash, slag and deposit) produced in the Tušimice Power Plant II are certified products. The deposit is used for landscape revitalization after the mining activity, the certified slag will be used for decontamination of the former Tušimice dump and the fly-ash is sold to be used in building industry. The complex restoration, worth 26 billion Czech crowns, also helped overcome the economic crisis in the location and the operation extension by 25 years will enable thousands of job positions to be preserved.
|Production unit - Tusimice II|
|Installed power output||4 x 200 MW|
|Operation commenced in the year||1974 - 1975|
|Desulphurized since the year||1997|
The Latest Technology Applied
Under the leadership of ŠKODA PRAHA Invest, the general supplier, four original boilers were replaced, electrical separators were reconstructed, new desulfurization equipment was built and the power station water management system was transformed.
There are currently four new three-body turbines installed on adjusted turbine frames, each with an output of 200 MW. Four generators for the machine room, complex equipment for the electrical part and an automated technological process control system were supplied by Siemens. The parameters achieve the stipulated “BAT” values for (Best Available Technology), which represents a worldwide recognized standard of emission limits and higher efficiency of modernized sources.
Details of New Technology
Steam turbine, 200 MW, supplied by ŠKODA POWER, is a three-body, impulse, condensing steam turbine with steam heating and eight non-controlled steam intakes for heating of condensate, supply water, heating water of exchange stations and turbine feed pump.
New boilers supplied by Vítkovice Power Engineering, once-through, double-pass boilers with granulating furnace and direct coal dust blowing into the burner sections. The boiler height is 57.5 m, combustion chamber size is 14,360 × 13,200 mm. The coal dust is prepared by six fan beater mills with dust burners leading to the combustion chamber walls. They reliably ensure the boiler operation at all output levels in the controlled range from 50 to 105% of nominal output. The combustion products drained from the rear boiler draft by a combustion product channel through a heater to the electrostatic fly-ash separator. The dusted-off combustion products are carried by a stack fan into the new desulfurization equipment where one desulfurization unit is used by two station units. SO2 and SO3oxides and HCL and HF acids are separated from the combustion products in the absorber, using contra-flow of lime-gypsum suspension; the main desulfurization product is gypsum (CaSO4). The desulfurized combustion products, mostly formed by water vapor, are drained away in a fiberglass pipeline DN 6,700 mm into reconditioned cooling towers.
Hydraulic slag removal was abandoned and the waste water processing system changed in a way that only waste water is currently drained, purified by the existing biological treatment plant (approximately 50,000 tons per year) as well as rain water. The new water management system ensures water refilling in the cooling tower circuit and treatment and repeated use of liquid wastes from the power station operation. The fly-ash from electrical filters is transported to the containers pneumatically; the slag and fly-ash from the boiler hoppers are drained away from the boiler room in a semi-dry way.
For the first time in the Czech conventional power stations conductor insulation with 100% “halogen-free” design was used (in case of cable blaze-up, production of toxic gases would decrease) as a part of the complex restoration.
The complex restoration also included general reconstruction of the hot-water exchange station that is used for supplying heat to the City of Kadaň, other smaller suppliers, as well as for heating the power station premises. The two-block exchange station with three water heaters has the nominal heat output of 80 MWt. Its arrangement enhances the block efficiency increase, as well as improvement of reliability of heat supplies to the consumers