The Prunerov Power Stations

The Prunerov Power StationThe Prunéřov Power Stations are the largest fossil power station complex in the Czech Republic. They are situated on the western edge of the North-Bohemian brown coal basin near the town of Chomutov. They consist of two technological units. Together with the Tušimice I and II power stations, they had formed the organizational unit of Elektrárny SSM, the Socialist Youth Union Power Stations, later renamed to Podkrušnohorské elektrárny (Podkrušnohorské Power Stations). Since 1993, they have been an independent organizational unit of ČEZ.

The Prunéřov I Power Station, the older of the two, began operations between 1967 and 1968. It consisted of six 110 MW units. Between 1987 and 1992, four of these units underwent extensive reconstruction, and the remaining two units were decommissioned during the capacity phasing-out program in the early 1990’s.The Prunéřov II Power Station is ČEZ’s newest fossil power station. It consists of five 210 MW units which have begun operations between 1981 and 1982.

The Prunéřov Power Stations are one of the largest electricity suppliers in the country. They also supply heat to the towns of Chomutov, Jirkov, and Klášterec nad Ohří. Their installed capacity for heat generation is 500 MW.

The process water for the power station comes from the Ohře River. The power station is fueled by brown coal from the Nástup Mines of Tušimice and Severočeské doly, a.s. (North-Bohemian Mines), and transported to the station along a railway siding. Prunéřov I is a unit-type power station.

The boilers are rated at 350 tons of steam per hour; the steam conditions are 13.63 MPa/540/535 °C. The boilers are double-pass, once-through, dry-bottom boilers with steam reheating. They were supplied by Vítkovické železárny (Vítkovice Ironworks).

The 110 MW turbines are condensing, impulse, and three-casing turbines, with steam reheated in the boiler. Each turbine has seven steam extraction points for regeneration, and two steam extraction points for heat supply. The conversion to a power-and-heating operation took place in the early 1990’s.

The output from two units of the power station is carried through the 125 MVA, 13.8/121 kV three-phase unit transformers into two 110 kV lines. The output of the remaining two units is carried through 125 MVA, 13.8/420 kV three-phase transformers into a mutual 400 kV line.

Prunéřov II is also a unit-type power station. The boilers are rated at 660 tons of steam per hour; the steam conditions are 13.53 MPa/540/540 °C. The boilers are drum, dry-bottom boilers with natural circulation. Powdered coal is blown directly into the furnace. The boilers have diaphragm walls, steam reheating, and combustion air preheating in Ljungström type rotary heaters.

The 210 MW steam turbines are impulse, condensing, single-shaft, and three-casing turbines with seven steam extraction points for the regenerative heating of the condensate. The steam heats both the air for the boiler and the water for heating the power station. It is also used as a supply of heat to the towns in the area. The station output is carried through the 240 MVA, 15.75/400 kV unit transformers into two 400 kV lines.

As the Prunéřov I and II stations are intended to continue full operation, they both have been desulphurized with the wet limestone washing method.The desulphurization equipment for Prunéřov I was supplied by the German firm Bischoff, GmbH; it was completed and commenced full operation at the end of 1995. The equipment for Prunéřov II was a turnkey operation from a consortium of the Japanese firms Mitsubishi Heavy Industries and Mitsubishi Corporation, in co-operation with the Czech firm ZVU Hradec Králové, a. s. It began operations in the summer of 1996.

Along with technological alterations and modifications, waste handling methods are changing as well. The former ash water-sluicing is being replaced by depositing the ash in a compound with the final desulphurization product, called industrial gypsum, and waste water in a converted dump in the Merkur mine of the Nástup Mines of Tušimice. Prunéřov I annually produces about 200,000 tons of industrial gypsum, and Prunéřov II over 550,000 tons. Only a part of this gypsum will be deposited. The entire amount produced by Prunéřov I will be used to make a construction material called Alpha-binders.

Generation Unit - Prunéřov II
Installed capacity 5 x 210 MW
Years of commissioning 1981 - 1982
Desulphurized since 1996
Generation Unit - Prunéřov I
Installed capacity 4 x 110 MW
Years of commissioning 1967 - 1968
Desulphurized since 1995

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