Steam-gas block GSU has been designed as a basic generation unit of the cogeneration power plant. In the heating season, water heaters are used to work at peak and off-peak times, which significantly reduces ecological noxiousness of the cogeneration power plant. In the summertime GSU covers completely consumers’ requirement for warm service water, generating the additional amount of electric energy at the same time thanks to fuller utilization of a low-pressure turbine. In the sectional view of the whole year, over 65% of heat, transferred from the cogeneration power plant to the municipal heating system, comes from GSU-100, however, the generated electric energy covers practically totally the city’s requirements
Gas and steam unit constitutes the combined system, which consists of:
- gas turboset for electric energy generation,
- heat recovery steam generator , which utilizes the heat of flue gases from the gas turbine’s outlet to the production of steam and the lattice water ,
- steam turbine of heating and condensing type to the production of heat and electric energy in the combined-cycle energy management.
The major utilization indicators are: GSU technological structure: Gas turbine V64.3A (1 avi) is a new generation machine, equipped with annular combustion chamber, on perimeter of which, there are 24 low-emission hybrid burners. A common rotor ranges a 17-level axial-flow compressor and 4-level turbine. Combustion gas from the combustion chamber (fig. 1) is directed to the gas turbine propelling the generator and the compressor. Stator and rotor vanes of the turbine (fig. 2) are cooled with the air drawn from the bleeder of the compressor. After the work is done within the turbine, combustion gas flows to the waste-heat boiler, where the steam, heated at two pressure levels, is generated. For better utilization of the thermal power, a lattice water heater is installed there. The steam from waste-heat boiler propels the steam turbine, which operates using the bleeding-condensation system. For cooling the condenser, a closed system of cooling water with fan cooler has been implemented. To reduce capital expenditures and simplify maintenance - for the first time in Poland – a unique GSU system has been used, both turbines propel the common generator by the means of gears. Implementing the combine-cycle allows for obtaining electric efficiency level of 50% in the new GSU, in addition to the total efficiency of fuel energy utilization of 89%.
| | | | | combustion chamber interior with burner view (fig. 2) |
Other advantages of GSU: low emission of dangerous pollutants, lack of combustion wastes, short start-time, the possibility of gaining large load changes in short time, low requirement for cooling water and other working media.
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