Power station

Technology of power plant

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Mátrai Erőmű had 2 energy-producing units of 100 MW installed output each and 3 of energy-producing units with 212 MW installed output each to 2006. Units consist of steam generators, turbogenerator equipment groups, cooling systems and equipment for combustion-gas purification. The power plant’s installed capacity reached

939 MW after the investment of two gas turbines of 30 MW and execution of other projects.

The daily lignite use of power plant is 20 to 25 thousand tons. The coal produced from the mines in Visonta and crushed to 60 mm in the crushing plant as well as the crushed coal arriving on railway cars from Bükkábrány are put into the coal storage area of this power plant which is capable of storing 180 thousand tons of fuel. The changing quality of coal quantity deposited at the coal storage area can be levelled out.

Fuel is put to the steam generators by means of an internal system for coal transportation. All the five steam generators are of coal-dust firing, two draughts and membrane wall in a semi-outdoor design. The heat quantity breaking loose when coal dust is burnt will generate steam in the vaporising systems of steam generators. Piping in the steam generator of the 212-MW block amounts to 45 km.

The energy of the high-pressure and high-temperature steam provided by steam generators will be transformed into electricity by means of turbogenerator equipment groups. The steam turbines are of three or four casings. First, any steam coming from the steam generator goes to the high-pressure stage of turbine then  after being reheated in the steam generator  to the middle-pressure and small-pressure stages of turbine. The steam coming from the final stage of turbine is introduced to the condensers. The cooling water of condensers is recycled to the Heller-Forgó-type closed towers with air cooling and the cooling water for condenser No. 3 is cooled in open cooling towers with artificial draft and water-film cooling. In order to provide the increased capacity due to the gas turbine investment, a so-called hybrid-cooling was executed by expanding the air condensational cooling of IV. and V. units by wet colling.

Electricity is produced by the generator on common axle with the turbine. The generator consists of stator and rotor. The d.c. current introduced to the coil of rotor moving together with the axle of turbine generates a magnetic field which generates three-phased a.c. current in the coils shifted at 120° from one another in stator. Electricity is connected to the national network through high-voltage trans.

 

 

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